Updating to last version of pdp 0.12.2

svn path=/trunk/externals/pdp/; revision=940

34 files changed, 11107 insertions, 0 deletions

diff --git a/system/X11/Makefile b/system/X11/Makefile
new file mode 100644
index 0000000..0001c49
--- /dev/null
+++ b/system/X11/Makefile
@@ -0,0 +1,11 @@
+
+OBJECTS = pdp_xwindow.o
+
+
+include ../../Makefile.config
+
+all: $(OBJECTS)
+
+clean:
+	rm -f *~
+	rm -f *.o
diff --git a/system/X11/pdp_xwindow.c b/system/X11/pdp_xwindow.c
new file mode 100644
index 0000000..563ee21
--- /dev/null
+++ b/system/X11/pdp_xwindow.c
@@ -0,0 +1,529 @@
+/*
+ *   Pure Data Packet system module. - x window glue code (fairly tied to pd and pdp)
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+
+// this code is fairly tied to pd and pdp. serves mainly as reusable glue code
+// for pdp_xv, pdp_glx, pdp_3d_windowcontext, ...
+
+
+#include "pdp.h"
+#include "pdp_xwindow.h"
+
+#define D if(0)
+
+
+static void pdp_xwindow_overrideredirect(t_pdp_xwindow *xwin, int b)
+{
+    XSetWindowAttributes new_attr;
+    new_attr.override_redirect = b ? True : False;
+    XChangeWindowAttributes(xwin->dpy, xwin->win, CWOverrideRedirect, &new_attr);
+    //XFlush(xwin->dpy);
+
+}
+
+
+void pdp_xwindow_moveresize(t_pdp_xwindow *xwin, int xoffset, int yoffset, int width, int height)
+{
+
+    D post("_pdp_xwindow_moveresize");
+    if ((width > 0) && (height > 0)){
+	xwin->winwidth = width;
+	xwin->winheight = height;
+	xwin->winxoffset = xoffset;
+	xwin->winyoffset = yoffset;
+
+	if (xwin->initialized){
+	    XMoveResizeWindow(xwin->dpy, xwin->win, xoffset, yoffset, width,  height);
+	    XFlush(xwin->dpy);
+	}
+    }
+}
+
+
+void pdp_xwindow_fullscreen(t_pdp_xwindow *xwin)
+{
+    XWindowAttributes rootwin_attr;
+
+    D post("pdp_xwindow_fullscreen");
+
+    /* hmm.. fullscreen and xlib the big puzzle..
+       if it looks like a hack it is a hack. */
+
+    if (xwin->initialized){
+
+        XGetWindowAttributes(xwin->dpy, RootWindow(xwin->dpy, xwin->screen), &rootwin_attr );
+
+	//pdp_xwindow_overrideredirect(xwin, 0);
+	pdp_xwindow_moveresize(xwin, 0, 0, rootwin_attr.width,  rootwin_attr.height);
+	//pdp_xwindow_overrideredirect(xwin, 1);
+	//XRaiseWindow(xwin->dpy, xwin->win);
+	//pdp_xwindow_moveresize(xwin, 0, 0, rootwin_attr.width,   rootwin_attr.height);
+	//pdp_xwindow_overrideredirect(xwin, 0);
+
+ 
+
+
+    }
+}
+
+
+void pdp_xwindow_tile(t_pdp_xwindow *xwin, int x_tiles, int y_tiles, int i, int j)
+{
+    XWindowAttributes rootwin_attr;
+    XSetWindowAttributes new_attr;
+
+    D post("pdp_xwindow_fullscreen");
+
+    if (xwin->initialized){
+	int tile_w;
+	int tile_h;
+        XGetWindowAttributes(xwin->dpy, RootWindow(xwin->dpy, xwin->screen), &rootwin_attr );
+
+	tile_w = rootwin_attr.width / x_tiles;
+	tile_h = rootwin_attr.height / y_tiles;
+
+	xwin->winwidth = (x_tiles-1) ? rootwin_attr.width - (x_tiles-1)*tile_w : tile_w;
+	xwin->winheight = (y_tiles-1) ? rootwin_attr.height - (y_tiles-1)*tile_h : tile_h;
+	xwin->winxoffset = i * tile_w;
+	xwin->winyoffset = j * tile_h;
+
+        //new_attr.override_redirect = True;
+        //XChangeWindowAttributes(xwin->dpy, xwin->win, CWOverrideRedirect, &new_attr );
+	XMoveResizeWindow(xwin->dpy, xwin->win, xwin->winxoffset, xwin->winyoffset, xwin->winwidth,  xwin->winheight);
+
+    }
+}
+
+/* resize window */
+void pdp_xwindow_resize(t_pdp_xwindow *xwin, int width, int height)
+{
+    D post("pdp_xwindow_resize");
+    if ((width > 0) && (height > 0)){
+	xwin->winwidth = width;
+	xwin->winheight = height;
+	if (xwin->initialized){
+	    XResizeWindow(xwin->dpy, xwin->win,  width,  height);
+	    XFlush(xwin->dpy);
+	}
+    }
+    //_pdp_xwindow_moveresize(xwin, xwin->winxoffset, xwin->winyoffset, width, height);
+}
+
+/* move window */
+void pdp_xwindow_move(t_pdp_xwindow *xwin, int xoffset, int yoffset)
+{
+    D post("pdp_xwindow_move");
+    pdp_xwindow_moveresize(xwin, xoffset, yoffset, xwin->winwidth, xwin->winheight);
+}
+
+/* send events to a pd outlet (don't call this outside the pd thread) */
+void pdp_xwindow_send_events(t_pdp_xwindow *xwin, t_outlet *outlet)
+{
+
+    unsigned int i;
+    XEvent e;
+    XConfigureEvent *ce = (XConfigureEvent *)&e;
+    XButtonEvent *be = (XButtonEvent *)&e;
+    XMotionEvent *me = (XMotionEvent *)&e;
+    t_symbol *s;
+    t_atom atom[2];
+    char nextdrag[]="drag0";
+    char but='0';
+    float inv_x = 1.0f / (float)(xwin->winwidth);
+    float inv_y = 1.0f / (float)(xwin->winheight);
+    int nbEvents =  XEventsQueued(xwin->dpy, QueuedAlready);
+    
+
+
+#if 0
+    while (nbEvents && XPending(xwin->dpy)){
+	XNextEvent(xwin->dpy, &e);
+	nbEvents--;
+        if (e.xany.window != xwin->win) {
+            XPutBackEvent(xwin->dpy, &e);
+            continue;
+        }
+#else
+
+    while (XPending(xwin->dpy)){
+	XNextEvent(xwin->dpy, &e);
+        //if (e.xany.window != xwin->win) continue;
+#endif
+
+	switch(e.type){
+	case ConfigureNotify:
+	    xwin->winwidth = ce->width;
+	    xwin->winheight = ce->height;
+	    inv_x = 1.0f / (float)(xwin->winwidth);
+	    inv_y = 1.0f / (float)(xwin->winheight);
+	    break;
+	    
+	case ClientMessage:
+	    if ((Atom)e.xclient.data.l[0] == xwin->WM_DELETE_WINDOW) {
+		//post("pdp_xv: button disabled, please send a \"close\" message to close the window");
+		//pdp_xv_kaboom(x);
+		//destroy = 1;
+	    }
+	    break;
+
+	case ButtonPress:
+	    //post("pdp_xv: press %f %f", inv_x * (float)be->x, inv_y * (float)be->y);
+	    SETFLOAT(atom+0,inv_x * (float)be->x);
+	    SETFLOAT(atom+1,inv_y * (float)be->y);
+	    outlet_anything(outlet, gensym("press"), 2, atom);
+	    switch(be->button){
+	    case Button1: outlet_anything(outlet, gensym("press1"), 2, atom); but='1'; break;
+	    case Button2: outlet_anything(outlet, gensym("press2"), 2, atom); but='2'; break;
+	    case Button3: outlet_anything(outlet, gensym("press3"), 2, atom); but='3'; break;
+	    case Button4: outlet_anything(outlet, gensym("press4"), 2, atom); but='4'; break;
+	    case Button5: outlet_anything(outlet, gensym("press5"), 2, atom); but='5'; break;
+	    default: break;
+	    }
+	    nextdrag[4]=but;
+	    xwin->dragbutton = gensym(nextdrag);
+	    break;
+
+	case ButtonRelease:
+	    //post("pdp_xv: release %f %f", inv_x * (float)be->x, inv_y * (float)be->y);
+	    SETFLOAT(atom+0,inv_x * (float)be->x);
+	    SETFLOAT(atom+1,inv_y * (float)be->y);
+	    outlet_anything(outlet, gensym("release"), 2, atom);
+	    switch(be->button){
+	    case Button1: outlet_anything(outlet, gensym("release1"), 2, atom); break;
+	    case Button2: outlet_anything(outlet, gensym("release2"), 2, atom); break;
+	    case Button3: outlet_anything(outlet, gensym("release3"), 2, atom); break;
+	    case Button4: outlet_anything(outlet, gensym("release4"), 2, atom); break;
+	    case Button5: outlet_anything(outlet, gensym("release5"), 2, atom); break;
+	    default: break;
+	    }
+
+	    break;
+	case MotionNotify:
+	    //post("pdp_xv: drag %f %f", inv_x * (float)be->x, inv_y * (float)be->y);
+	    SETFLOAT(atom+0,inv_x * (float)be->x);
+	    SETFLOAT(atom+1,inv_y * (float)be->y);
+	    outlet_anything(outlet, gensym("drag"), 2, atom);
+	    outlet_anything(outlet, xwin->dragbutton, 2, atom);
+	    break;
+
+	default:
+	    //post("pdp_xv: unknown event");
+	    break;
+	}
+	
+    }
+
+}
+
+
+
+void pdp_xwindow_cursor(t_pdp_xwindow *xwin, t_floatarg f)
+{
+    if (!xwin->initialized) return;
+
+    if (f == 0) {
+        static char data[] = {0};
+
+        Cursor cursor;
+        Pixmap blank;
+        XColor dummy;
+
+        blank = XCreateBitmapFromData(xwin->dpy, xwin->win, data, 1, 1);
+        cursor = XCreatePixmapCursor(xwin->dpy, blank, blank, &dummy,
+                                     &dummy, 0, 0);
+        XFreePixmap(xwin->dpy, blank);
+        XDefineCursor(xwin->dpy, xwin->win,cursor);
+    }
+    else
+        XUndefineCursor(xwin->dpy, xwin->win);
+
+    xwin->cursor = f;
+}
+
+/* create xwindow */
+int pdp_xwindow_create_on_display(t_pdp_xwindow *xwin, Display *dpy)
+{
+    XEvent e;
+    unsigned int i;
+
+    /* check if already opened */
+    if(  xwin->initialized ){
+	post("pdp_xwindow_create_on_display: window already created");
+	goto exit;
+    }
+    
+    xwin->dpy = dpy;
+
+    /* create a window */
+    xwin->screen = DefaultScreen(xwin->dpy);
+
+
+    xwin->win = XCreateSimpleWindow(
+	xwin->dpy, 
+	RootWindow(xwin->dpy, xwin->screen), xwin->winxoffset, xwin->winyoffset, xwin->winwidth, xwin->winheight, 0, 
+	BlackPixel(xwin->dpy, xwin->screen),
+	BlackPixel(xwin->dpy, xwin->screen));
+
+
+    /* enable handling of close window event */
+    xwin->WM_DELETE_WINDOW = XInternAtom(xwin->dpy, "WM_DELETE_WINDOW", True);
+    (void)XSetWMProtocols(xwin->dpy, xwin->win, &xwin->WM_DELETE_WINDOW, 1);
+
+    if(!(xwin->win)){
+	/* clean up mess */
+	post("pdp_xwindow_create_on_display: could not create window. closing.\n");
+	//XCloseDisplay(xwin->dpy); NOT OWNER
+	xwin->dpy = 0;
+	xwin->initialized = false;
+	goto exit;
+    }
+
+    /* select input events */
+    XSelectInput(xwin->dpy, xwin->win, StructureNotifyMask  | ButtonPressMask | ButtonReleaseMask | MotionNotify | ButtonMotionMask);
+    //XSelectInput(xwin->dpy, xwin->win, StructureNotifyMask);
+
+
+    /* set window title */
+    XStoreName(xwin->dpy, xwin->win, "pdp");
+
+
+    /* map */
+    XMapWindow(xwin->dpy, xwin->win);
+
+    /* create graphics context */
+    xwin->gc = XCreateGC(xwin->dpy, xwin->win, 0, 0);
+
+    /* catch mapnotify */
+    for(;;){
+	XNextEvent(xwin->dpy, &e);
+	if (e.type == MapNotify) break;
+    }
+
+
+    /* we're done initializing */
+    xwin->initialized = true;
+
+    /* disable/enable cursor */
+    pdp_xwindow_cursor(xwin, xwin->cursor);
+
+ exit:
+    return xwin->initialized;
+
+}
+
+void pdp_xwindow_init(t_pdp_xwindow *xwin)
+{
+    xwin->dpy = 0;
+    xwin->screen = -1;
+
+    xwin->winwidth = 320;
+    xwin->winheight = 240;
+    xwin->winxoffset = 0;
+    xwin->winyoffset = 0;
+
+    xwin->initialized = 0;
+
+    xwin->cursor = 0;
+    xwin->dragbutton = gensym("drag1");
+
+}
+    
+
+void pdp_xwindow_close(t_pdp_xwindow *xwin)
+{
+    
+    XEvent e;
+
+    if (xwin->initialized){
+	XFreeGC(xwin->dpy, xwin->gc);
+	XDestroyWindow(xwin->dpy, xwin->win);
+	while(XPending(xwin->dpy)) XNextEvent(xwin->dpy, &e);
+	xwin->dpy = 0;
+	xwin->initialized = false;
+    }
+
+}
+
+void pdp_xwindow_free(t_pdp_xwindow *x)
+{
+    // close win
+    pdp_xwindow_close(x);
+
+    // no more dynamic data to free
+}
+
+
+
+// some more x specific stuff: XVideo
+
+static void pdp_xvideo_create_xvimage(t_pdp_xvideo *xvid, int width, int height)
+{
+    int i;
+    long size;
+    
+    //post("pdp_xvideo_create_xvimage");
+
+    xvid->width = width;
+    xvid->height = height;
+    size = (xvid->width * xvid->height + (((xvid->width>>1)*(xvid->height>>1))<<1));
+    //post("create xvimage %d %d", xvid->width, xvid->height);
+    xvid->data = (unsigned char *)pdp_alloc(size);
+    for (i=0; i<size; i++) xvid->data[i] = i;
+    xvid->xvi = XvCreateImage(xvid->dpy, xvid->xv_port, xvid->xv_format, (char *)xvid->data, xvid->width, xvid->height);
+    xvid->last_encoding = -1;
+    if ((!xvid->xvi) || (!xvid->data)) post ("ERROR CREATING XVIMAGE");
+    //post("created xvimag data:%x xvi:%x",xvid->data,xvid->xvi);
+
+}
+
+static void pdp_xvideo_destroy_xvimage(t_pdp_xvideo *xvid)
+{
+    if(xvid->data) pdp_dealloc(xvid->data);
+    if (xvid->xvi) XFree(xvid->xvi);
+    xvid->xvi = 0;
+    xvid->data = 0;
+}
+
+void pdp_xvideo_display_packet(t_pdp_xvideo *xvid, t_pdp_xwindow *xwin, int packet)
+{
+    t_pdp *header = pdp_packet_header(packet);
+    void *data = pdp_packet_data(packet);
+    t_bitmap * bm = pdp_packet_bitmap_info(packet);
+    unsigned int width, height, encoding, size, nbpixels;
+
+    /* some checks: only display when initialized and when pacet is bitmap YV12 */
+    if (!xvid->initialized) return;
+    if (!header) return;
+    if (!bm) return;
+
+    width = bm->width;
+    height = bm->height;
+    encoding = bm->encoding;
+    size = (width * height + (((width>>1)*(height>>1))<<1));
+    nbpixels = width * height;
+
+    if (PDP_BITMAP != header->type) return;
+    if (PDP_BITMAP_YV12 != encoding) return;
+
+    /* check if xvimage needs to be recreated */
+    if ((width != xvid->width) || (height != xvid->height)){
+	//post("pdp_xv: replace image");
+	pdp_xvideo_destroy_xvimage(xvid);
+	pdp_xvideo_create_xvimage(xvid, width, height);
+    }
+
+    /* copy the data to the XvImage buffer */
+    memcpy(xvid->data, data, size);
+
+    /* display */
+    XvPutImage(xvid->dpy,xvid->xv_port, xwin->win,xwin->gc,xvid->xvi, 
+               0,0,xvid->width,xvid->height, 0,0,xwin->winwidth,xwin->winheight);
+    XFlush(xvid->dpy);
+
+
+   
+}
+
+
+
+void pdp_xvideo_close(t_pdp_xvideo* xvid)
+{
+    if (xvid->initialized){
+	if (xvid->xvi) pdp_xvideo_destroy_xvimage(xvid);
+	XvUngrabPort(xvid->dpy, xvid->xv_port, CurrentTime);
+	xvid->xv_port = 0;
+	xvid->dpy = 0;
+	xvid->screen = -1;
+	xvid->last_encoding = -1;
+	xvid->initialized = false;
+    }
+}
+
+void pdp_xvideo_free(t_pdp_xvideo* xvid)
+{
+    // close xvideo port (and delete XvImage)
+    pdp_xvideo_close(xvid);
+
+    // no more dynamic data to free
+
+}
+
+void pdp_xvideo_init(t_pdp_xvideo *xvid)
+{
+
+    xvid->dpy = 0;
+    xvid->screen = -1;
+
+    xvid->xv_format = FOURCC_YV12;
+    xvid->xv_port      = 0;
+
+    xvid->width = 320;
+    xvid->height = 240;
+
+    xvid->data = 0;
+    xvid->xvi = 0;
+
+    xvid->initialized = 0;
+    xvid->last_encoding = -1;
+
+}
+
+int pdp_xvideo_open_on_display(t_pdp_xvideo *xvid, Display *dpy)
+{
+    unsigned int ver, rel, req, ev, err, i, j;
+    unsigned int adaptors;
+    int formats;
+    XvAdaptorInfo        *ai;
+
+    if (xvid->initialized) return 1;
+    if (!dpy) return 0;
+    xvid->dpy = dpy;
+    
+    if (Success != XvQueryExtension(xvid->dpy,&ver,&rel,&req,&ev,&err))	return 0;
+
+    /* find + lock port */
+    if (Success != XvQueryAdaptors(xvid->dpy,DefaultRootWindow(xvid->dpy),&adaptors,&ai))
+	return 0;
+    for (i = 0; i < adaptors; i++) {
+	if ((ai[i].type & XvInputMask) && (ai[i].type & XvImageMask)) {
+	    for (j=0; j < ai[i].num_ports; j++){
+		if (Success != XvGrabPort(xvid->dpy,ai[i].base_id+j,CurrentTime)) {
+		    //fprintf(stderr,"INFO: Xvideo port %ld on adapter %d: is busy, skipping\n",ai[i].base_id+j, i);
+		}
+		else {
+		    xvid->xv_port = ai[i].base_id + j;
+		    goto breakout;
+		}
+	    }
+	}
+    }
+
+
+ breakout:
+
+    XFree(ai);
+    if (0 == xvid->xv_port) return 0;
+    post("pdp_xvideo: grabbed port %d on adaptor %d", xvid->xv_port, i);
+    xvid->initialized = 1;
+    pdp_xvideo_create_xvimage(xvid, xvid->width, xvid->height);
+    return 1;
+}
+
+
diff --git a/system/image/Makefile b/system/image/Makefile
new file mode 100644
index 0000000..f9ed52c
--- /dev/null
+++ b/system/image/Makefile
@@ -0,0 +1,21 @@
+include ../../Makefile.config
+
+all: $(PDP_TARGET)
+
+OBJECTS = pdp_llconv.o pdp_resample.o pdp_imageproc_common.o
+
+OBJECTS_MMX = pdp_imageproc_mmx.o pdp_llconv_mmx.o
+OBJECTS_PORTABLE =  pdp_imageproc_portable.o pdp_llconv_portable.o
+
+
+
+
+linux_mmx: $(OBJECTS_MMX) $(OBJECTS)
+
+linux: $(OBJECTS_PORTABLE) $(OBJECTS)
+
+darwin: $(OBJECTS_PORTABLE) $(OBJECTS)
+
+clean:
+	rm -f *~
+	rm -f *.o
diff --git a/system/image/pdp_imageproc_common.c b/system/image/pdp_imageproc_common.c
new file mode 100644
index 0000000..bc34b79
--- /dev/null
+++ b/system/image/pdp_imageproc_common.c
@@ -0,0 +1,596 @@
+/*
+ *   Pure Data Packet. common image processing routines.
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+
+/*
+  This file contains common code for (portable) low level image processing objects
+  pdp_imageproc_* methods
+  The rest is int pdp_imageproc_<platform>.c
+
+  There are also highlevel dispatcher methods that operate on packets:
+  pdp_imageproc_dispatch_* methods
+
+*/
+
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include "pdp.h"
+
+#define CLAMP16(x) (((x) > 0x7fff) ? 0x7fff : (((x) < -0x7fff) ? -0x7fff : (x)))
+
+u32 pdp_imageproc_legalwidth(int i)
+{
+    if (i>1024) return 1024;
+    if (i>0) return  ((((i-1)>>3)+1)<<3);
+    return 8;
+    
+}
+
+u32 pdp_imageproc_legalheight(int i)
+{
+    if (i>1024) return 1024;
+    if (i>0) return  ((((i-1)>>3)+1)<<3);
+    return 8;
+}
+u32 pdp_imageproc_legalwidth_round_down(int i)
+{
+    if (i>1024) return 1024;
+    if (i>8) return  ((i>>3)<<3);
+    return 8;
+    
+}
+
+u32 pdp_imageproc_legalheight_round_down(int i)
+{
+    if (i>1024) return 1024;
+    if (i>8) return  ((i>>3)<<3);
+    return 8;
+}
+
+
+
+/* some operations */
+
+/* logic operators */
+
+void pdp_imageproc_xor_process(void *x, u32 width, u32 height, s16 *image, s16 *image2)
+{
+    u32 *plane = (u32 *)image;
+    u32 *plane2 = (u32 *)image2;
+    int count = (width * height) >> 1;
+    int i;
+
+    for (i=0; i<count; i++){
+	plane[i] ^= plane2[i];
+    }
+}
+
+void pdp_imageproc_and_process(void *x, u32 width, u32 height, s16 *image, s16 *image2)
+{
+    u32 *plane = (u32 *)image;
+    u32 *plane2 = (u32 *)image2;
+    int count = (width * height) >> 1;
+    int i;
+
+    for (i=0; i<count; i++){
+	plane[i] &= plane2[i];
+    }
+}
+
+void pdp_imageproc_or_process(void *x, u32 width, u32 height, s16 *image, s16 *image2)
+{
+    u32 *plane = (u32 *)image;
+    u32 *plane2 = (u32 *)image2;
+    int count = (width * height) >> 1;
+    int i;
+
+    for (i=0; i<count; i++){
+	plane[i] |= plane2[i];
+    }
+}
+
+void pdp_imageproc_not_process(void *x, u32 width, u32 height, s16 *image)
+{
+    u32 *plane = (u32 *)image;
+    int count = (width * height) >> 1;
+    int i;
+
+    for (i=0; i<count; i++){
+	plane[i] ^= 0xffffffff;
+    }
+}
+
+void pdp_imageproc_mask_process(void *x, u32 width, u32 height, s16 *image)
+{
+    u32 mask = (u32)x;
+    u32 *plane = (u32 *)image;
+    int count = (width * height) >> 1;
+    int i;
+
+    mask = (mask & 0xffff) | (mask << 16);
+
+    for (i=0; i<count; i++){
+	plane[i] &= mask;
+    }
+}
+
+// produce a plasma image
+// note: random number generator can be platform specific
+// however, it should be seeded. (same seed produces the same result)
+
+typedef struct
+{
+    u32 seed;
+    s32 scale;
+} t_plasma;
+
+static inline s16 _rand_s16(void)
+{
+  return (s16)(random()<<0);
+}
+
+static inline s16 _new_color(s32 one, s32 two, s32 scale)
+{
+  return CLAMP16((one >> 1) + (two >> 1) + ((scale * _rand_s16()) >> 16));
+  //return (one >> 1) + (two >> 1);
+}
+
+void *pdp_imageproc_plasma_new(void){return pdp_alloc(sizeof(t_plasma));}
+void pdp_imageproc_plasma_delete(void *x){pdp_dealloc(x);}
+void pdp_imageproc_plasma_setseed(void *x, float seed)
+{
+    *((float *)x) = seed;
+}
+void pdp_imageproc_plasma_setturbulence(void *x, float f)
+{
+    ((t_plasma *)x)->scale = CLAMP16(f * ((float)0x7fff));
+}
+
+static void _plasma_subdiv(u32 w, u32 h, u32 s, s16 *image, int calc_left, int calc_top, s32 scale)
+{
+  int w0 = ((w-1)>>1);  // width of left segments
+  int h0 = ((h-1)>>1);  // heigth of top segments
+  int w1 = w - w0;
+  int h1 = h - h0;
+
+  /* conditions: w0 <= w1, h0 <= h1 */
+
+  /* original coordinates */
+  int topleft = 0;
+  int topright = w-1;
+  int bottomleft = s * (h-1);
+  int bottomright = bottomleft + topright;
+
+  /* new subdivision coordinates */
+  int top = w0;
+  int left = s * h0;
+  int bottom = bottomleft + w0;
+  int right = topright + left;
+  int center = left + top;
+
+  if (w0 && h0){ /* left-right and top-bottom subdivide */
+
+    /* calculate corner pixel colours */
+    if (calc_top)  image[top]    = _new_color(image[topleft], image[topright], scale);
+    if (calc_left) image[left]   = _new_color(image[topleft], image[bottomleft], scale);
+    image[right]  = _new_color(image[topright], image[bottomright], scale);
+    image[bottom] = _new_color(image[bottomleft], image[bottomright], scale);
+    image[center] = (_new_color(image[top], image[bottom], scale) >> 1)
+	+(_new_color(image[left], image[right], scale) >> 1);
+
+
+    /* subdivide (with overlap) */
+    _plasma_subdiv(w0+1, h0+1, s, &image[topleft], 1, 1, scale);
+    _plasma_subdiv(w1, h0+1, s, &image[top], 0, 1, scale);
+    _plasma_subdiv(w0+1, h1, s, &image[left], 1, 0, scale);
+    _plasma_subdiv(w1, h1, s, &image[center], 0, 0, scale);
+    
+  }
+  
+
+  else if(h0) { /* top-bottom subdivide */
+
+      //post("h:%d", h);
+
+    /* calculate corner pixel colours */
+    if(calc_left) image[left]   = _new_color(image[topleft], image[bottomleft], scale);
+    image[right]  = _new_color(image[topright], image[bottomright], scale);
+
+    /* subdivide (without overlap) */
+    _plasma_subdiv(w, h0+1, s, &image[topleft], 1, 0, scale);
+    _plasma_subdiv(w, h1, s, &image[left], 1, 0, scale);
+    
+  }
+  
+  else if (w0){ /* left-right subdivide */
+
+    /* calculate corner pixel colours */
+    if (calc_top) image[top]    = _new_color(image[topleft], image[topright], scale);
+    image[bottom] = _new_color(image[bottomleft], image[bottomright],scale);
+
+    /* subdivide with overlap */
+    _plasma_subdiv(w0+1, h, s, &image[topleft], 0, 1, scale);
+    _plasma_subdiv(w1, h, s, &image[top], 0, 1, scale);
+
+  }
+
+}
+
+void pdp_imageproc_plasma_process(void *x, u32 width, u32 height, s16 *image)
+{
+    s32 scale = (((t_plasma *)x)->scale);
+    srandom (((t_plasma *)x)->seed);
+
+    /* set initial border colours */
+    image[0]                  = _rand_s16();
+    image[width-1]            = _rand_s16();
+    image[width * (height-1)] = _rand_s16();
+    image[width * height - 1] = _rand_s16();
+
+    /* subdivide */
+    _plasma_subdiv(width, height, width, image, 1, 1, scale);
+
+    ((t_plasma *)x)->seed = random();
+
+}
+  
+
+
+void pdp_imageproc_zero_process(void *x, u32 width, u32 height, s16 *image)
+{
+    int bytesize = (width * height) << 1;
+    memset(image, 0, bytesize);
+}
+
+void pdp_imageproc_constant_process(void *x, u32 width, u32 height, s16 *image)
+{
+    int i;
+    u32 value = (u32)x;
+    u32 *plane = (u32 *)image;
+    int wordsize = (width * height) >> 1;
+    value = (value & 0xffff) | (value << 16);
+    for (i=0; i<wordsize; i++){
+	plane[i] = value;
+    }
+}
+
+
+/* other stateless operators */
+
+/* some 2x16bit vector ops */
+
+/* some bit shuffling to ensure 32 bit accesses 
+   get the sign bit extended as a mask: - : 0xffff +: 0x0000 */
+static inline u32 _sign(s32 invec)
+{
+    s32 mask_top = invec;
+    s32 mask_bot = invec;
+
+    mask_top &= 0x80000000; /* isolate top sign bit */
+    mask_bot <<= 16;        /* shift bottom word to top word */
+    mask_bot &= 0x80000000; /* isolate bottom sign bit */
+    mask_top >>= 15;        /* shift sign bit into top word */
+    mask_bot >>= 15;
+    ((u32)mask_bot) >>=16;  /* shift top word into bottom word */
+    return mask_top |mask_bot;    
+}
+
+/* clear the least significant bit of the top word
+   to ensure a decoupled vector add */
+static inline void _decouple(s32 *invec)
+{
+    *invec &= 0xfffeffff;
+}
+
+void pdp_imageproc_abs_process(void *x, u32 width, u32 height, s16 *image)
+{
+    int i;
+    s32 *wimage = (s32 *)image;
+    int wsize = (width * height) >> 1;
+    for (i=0; i<wsize; i++){
+	/* this computes  c = (c >= 0) ? (c) : (~c) */
+	/* not is used instead of neg to prevent overflow on 0x8000 */
+	/* this maps both 0 and -1 to 0 */
+
+	wimage[i] ^= _sign(wimage[i]);
+	
+    }
+}
+
+void pdp_imageproc_zthresh_process(void *x, u32 width, u32 height, s16 *image)
+{
+    int i;
+    s32 *wimage = (s32 *)image;
+    int wsize = (width * height) >> 1;
+    for (i=0; i<wsize; i++){
+	/* this computes  c = (c >= 0) ? (c) : (0) */
+	wimage[i] &= ~_sign(wimage[i]);
+    }
+}
+
+/* hard thresholding: x contains a positive unsigned short int */
+void pdp_imageproc_hardthresh_process(void *x, u32 width, u32 height, s16 *image)
+{
+    int i;
+    s32 thresh = (s32)x;
+    s32 sign1, isign2, a;
+    s32 *wimage = (s32 *)image;
+    int wsize = (width * height) >> 1;
+    thresh |= (thresh << 16);
+    for (i=0; i<wsize; i++){
+	a = wimage[i];
+	sign1 = _sign(a);   
+	a ^= sign1;           /* take abs */
+	_decouple(&a);
+	a -= thresh;          /* subtract threshold */
+	isign2 = ~ _sign(a);
+	a &= isign2;          /* zero thresh */
+	_decouple(&a);
+	a += thresh & isign2; /* add threshold (if not zero thresholded)*/
+	a ^= sign1;
+	wimage[i] = a;
+    }
+}
+
+/* soft thresholding: x contains a positive unsigned short int */
+void pdp_imageproc_softthresh_process(void *x, u32 width, u32 height, s16 *image)
+{
+    int i;
+    s32 thresh = (s32)x;
+    s32 sign1, sign2, a;
+    s32 *wimage = (s32 *)image;
+    int wsize = (width * height) >> 1;
+    thresh |= thresh << 16;
+    for (i=0; i<wsize; i++){
+	a = wimage[i];
+	sign1 = _sign(a);   
+	a ^= sign1;           /* take abs */
+	_decouple(&a);
+	a -= thresh;          /* subtract threshold */
+	sign2 = _sign(a);
+	a &= ~ sign2;         /* zero thresh */
+	_decouple(&a);
+	//a += thresh;        /* add threshold */
+	a ^= sign1;
+	wimage[i] = a;
+	
+    }
+
+}
+
+
+/* turns an image into a positive andmask */
+void pdp_imageproc_ispositive_process(void *x, u32 width, u32 height, s16 *image)
+{
+    int i;
+    s32 *wimage = (s32 *)image;
+    int wsize = (width * height) >> 1;
+    for (i=0; i<wsize; i++){
+	wimage[i] = ~_sign(wimage[i]);
+    }
+
+}
+
+/* get sign */
+void pdp_imageproc_sign_process(void *x, u32 width, u32 height, s16 *image)
+{
+    int i;
+    s32 *wimage = (s32 *)image;
+    int wsize = (width * height) >> 1;
+    for (i=0; i<wsize; i++){
+	wimage[i] = _sign(wimage[i]) ^ 0x7fff7fff;
+    }
+
+}
+
+/* flip left <-> right */
+void pdp_imageproc_flip_lr_process(void *dummy, u32 width, u32 height, s16 *image)
+{
+    u32 y;
+    s16 tmp, *l, *r;
+    for (y=0; y<height; y++){
+	l = image;
+	r = image + width - 1;
+	while (l < r){
+	    tmp = *l;
+	    *l = *r;
+	    *r = tmp;
+	    l++;
+	    r--;
+	}
+	image += width;
+    }
+
+}
+
+void pdp_llconv_flip_top_bottom(s16 *data, int width, int height, int pixelsize);
+
+void pdp_imageproc_flip_tb_process(void *dummy, u32 width, u32 height, s16 *image)
+{
+    pdp_llconv_flip_top_bottom(image, width, height, 2);
+}
+
+
+/* image processing dispatcher methods  */
+/* if the first packet contains a nonzero channel mask, it will be used instead
+   of the one supplied as argument to the dispatcher functions.
+   the packet's channel mask will be reset to 0 */
+
+void pdp_imageproc_dispatch_1buf(void (*process_routine)(void*, u32, u32, s16*), void *x, u32 chanmask, int packet0)
+{
+    t_pdp *header0;
+    t_image *image0;
+    s16  *idata0;
+    unsigned int w,h,d,plane_size,mask;
+ 
+    /* if packet is not a valid image return without doing anything */
+    if (!(pdp_packet_image_isvalid(packet0))) return;
+
+    header0 = pdp_packet_header(packet0);
+    image0 = pdp_packet_image_info(packet0);
+    idata0   = pdp_packet_data  (packet0);
+
+    w = image0->width;
+    h = image0->height;
+    d = image0->depth;
+    plane_size = w*h;
+
+    if (image0->chanmask) chanmask = image0->chanmask;
+    image0->chanmask = 0;
+
+
+    switch(image0->encoding){
+    case PDP_IMAGE_GREY:
+	if (chanmask & 1) (*process_routine)(x, w, h, idata0);
+	break;
+    case PDP_IMAGE_YV12:
+	if (chanmask & 1) (*process_routine)(x, w, h, idata0);
+	idata0 += plane_size;
+	plane_size >>= 2;
+	w >>= 1;
+	h >>= 1;
+	if (chanmask & 2) (*process_routine)(x, w, h, idata0);
+	idata0 += plane_size;
+	if (chanmask & 4) (*process_routine)(x, w, h, idata0);
+	break;
+    case PDP_IMAGE_MCHP:
+	mask = 1;
+	while (d--){
+	    if (chanmask & mask) (*process_routine)(x, w, h, idata0);
+	    idata0 += plane_size;
+	    mask <<= 1;
+	}
+	break;
+    default:
+	break;
+    }
+}
+
+
+void pdp_imageproc_dispatch_2buf(void (*process_routine)(void*, u32, u32, s16*, s16 *), void *x, u32 chanmask, int packet0, int packet1)
+{
+    t_pdp *header0;
+    t_image *image0;
+    s16  *idata0, *idata1;
+    unsigned int w,h,d,plane_size,mask;
+ 
+    /* if packets are not compatible images, return without doing anything */
+    if (!(pdp_packet_image_compat(packet0, packet1))) return;
+
+    header0 = pdp_packet_header(packet0);
+    image0 = pdp_packet_image_info(packet0);
+    idata0   = pdp_packet_data  (packet0);
+    idata1   = pdp_packet_data  (packet1);
+
+    w = image0->width;
+    h = image0->height;
+    d = image0->depth;
+    plane_size = w*h;
+
+    if (image0->chanmask) chanmask = image0->chanmask;
+    image0->chanmask = 0;
+
+    switch(image0->encoding){
+    case PDP_IMAGE_GREY:
+	if (chanmask & 1) (*process_routine)(x, w, h, idata0, idata1);
+	break;
+    case PDP_IMAGE_YV12:
+	if (chanmask & 1) (*process_routine)(x, w, h, idata0, idata1);
+	idata0 += plane_size;
+	idata1 += plane_size;
+	plane_size >>= 2;
+	w >>= 1;
+	h >>= 1;
+	if (chanmask & 2) (*process_routine)(x, w, h, idata0, idata1);
+	idata0 += plane_size;
+	idata1 += plane_size;
+	if (chanmask & 4) (*process_routine)(x, w, h, idata0, idata1);
+	break;
+    case PDP_IMAGE_MCHP:
+	mask = 1;
+	while (d--){
+	    if (chanmask & mask) (*process_routine)(x, w, h, idata0, idata1);
+	    idata0 += plane_size;
+	    idata1 += plane_size;
+	    mask <<= 1;
+	}
+	break;
+    default:
+	break;
+    }
+}
+void pdp_imageproc_dispatch_3buf(void (*process_routine)(void*, u32, u32, s16*, s16 *, s16 *), void *x, u32 chanmask, int packet0, int packet1, int packet2)
+{
+    t_pdp *header0;
+    t_image *image0;
+    s16  *idata0, *idata1, *idata2;
+    unsigned int w,h,d,plane_size, mask;
+ 
+    /* if packets are not compatible images, return without doing anything */
+    if (!((pdp_packet_image_compat(packet0, packet1))
+	  &&(pdp_packet_image_compat(packet0, packet1)))) return;
+
+    header0 = pdp_packet_header(packet0);
+    image0 = pdp_packet_image_info(packet0);
+    idata0   = pdp_packet_data  (packet0);
+    idata1   = pdp_packet_data  (packet1);
+    idata2   = pdp_packet_data  (packet2);
+
+    w = image0->width;
+    h = image0->height;
+    d = image0->depth;
+    plane_size = w*h;
+
+    if (image0->chanmask) chanmask = image0->chanmask;
+    image0->chanmask = 0;
+
+    switch(image0->encoding){
+    case PDP_IMAGE_GREY:
+	if (chanmask & 1)(*process_routine)(x, w, h, idata0, idata1, idata2);
+	break;
+    case PDP_IMAGE_YV12:
+	if (chanmask & 1)(*process_routine)(x, w, h, idata0, idata1, idata2);
+	idata0 += plane_size;
+	idata1 += plane_size;
+	idata2 += plane_size;
+	plane_size >>= 2;
+	w >>= 1;
+	h >>= 1;
+	if (chanmask & 2)(*process_routine)(x, w, h, idata0, idata1, idata2);
+	idata0 += plane_size;
+	idata1 += plane_size;
+	idata2 += plane_size;
+	if (chanmask & 4)(*process_routine)(x, w, h, idata0, idata1, idata2);
+	break;
+    case PDP_IMAGE_MCHP:
+	mask = 1;
+	while (d--){
+	    if (chanmask & mask) (*process_routine)(x, w, h, idata0, idata1, idata2);
+	    idata0 += plane_size;
+	    idata1 += plane_size;
+	    idata2 += plane_size;
+	    mask <<= 1;
+	}
+	break;
+    default:
+	break;
+    }
+}
diff --git a/system/image/pdp_imageproc_mmx.c b/system/image/pdp_imageproc_mmx.c
new file mode 100644
index 0000000..b518aa2
--- /dev/null
+++ b/system/image/pdp_imageproc_mmx.c
@@ -0,0 +1,590 @@
+/*
+ *   Pure Data Packet. c wrapper for mmx image processing routines.
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+
+/* this is a c wrapper around platform specific (mmx) code */
+#include <stdlib.h>
+#include <math.h>
+#include "pdp_mmx.h"
+#include "pdp_imageproc.h"
+#include "m_pd.h"
+
+/* pdp memory alloc/dealloc prototype */
+void *pdp_alloc(int size);
+void pdp_dealloc(void *);
+
+// utility stuff
+inline static s16 float2fixed(float f)
+{
+    if (f > 1) f = 1;
+    if (f < -1) f = -1;
+    f *= 0x7fff;
+    return (s16)f;
+}
+
+inline static void setvec(s16 *v, float f)
+{
+    s16 a = float2fixed(f);
+    v[0] = a;
+    v[1] = a;
+    v[2] = a;
+    v[3] = a;
+}
+
+
+
+// add two images
+void pdp_imageproc_add_process(void *x, u32 width, u32 height, s16 *image, s16 *image2)
+{
+    unsigned int totalnbpixels = width * height;
+    pixel_add_s16(image, image2, totalnbpixels>>2);
+}
+
+// mul two images
+void pdp_imageproc_mul_process(void *x, u32 width, u32 height, s16 *image, s16 *image2)
+{
+    unsigned int totalnbpixels = width * height;
+    pixel_mul_s16(image, image2, totalnbpixels>>2);
+}
+
+// mix 2 images
+void *pdp_imageproc_mix_new(void){return pdp_alloc(8*sizeof(s16));}
+void pdp_imageproc_mix_delete(void *x) {pdp_dealloc (x);}
+void pdp_imageproc_mix_setleftgain(void *x, float gain){setvec((s16 *)x, gain);}
+void pdp_imageproc_mix_setrightgain(void *x, float gain){setvec((s16 *)x + 4, gain);}
+void pdp_imageproc_mix_process(void *x, u32 width, u32 height, s16 *image, s16 *image2)
+{
+    s16 *d = (s16 *)x;
+    unsigned int totalnbpixels = width * height;
+    pixel_mix_s16(image, image2, totalnbpixels>>2, d, d+4);
+}
+
+
+// random mix 2 images
+void *pdp_imageproc_randmix_new(void){return pdp_alloc(8*sizeof(s16));}
+void pdp_imageproc_randmix_delete(void *x) {pdp_dealloc (x);}
+void pdp_imageproc_randmix_setthreshold(void *x, float threshold){setvec((s16 *)x, 2*threshold-1);}
+void pdp_imageproc_randmix_setseed(void *x, float seed)
+{
+    s16 *d = (s16 *)x;
+    srandom((u32)seed);
+    d[4] = (s16)random();
+    d[5] = (s16)random();
+    d[6] = (s16)random();
+    d[7] = (s16)random();
+    
+}
+void pdp_imageproc_randmix_process(void *x, u32 width, u32 height, s16 *image, s16 *image2)
+{
+    s16 *d = (s16 *)x;
+    unsigned int totalnbpixels = width * height;
+    pixel_randmix_s16(image, image2, totalnbpixels>>2, d+4, d);
+}
+
+
+// 3x1 or 1x3 in place convolution
+// orientation
+typedef struct
+{
+    s16 min1[4];
+    s16 zero[4];
+    s16 plus1[4];
+    s16 border[4];
+    u32 orientation;
+    u32 nbpasses;
+} t_conv;
+void *pdp_imageproc_conv_new(void){return(pdp_alloc(sizeof(t_conv)));}
+void pdp_imageproc_conv_delete(void *x){pdp_dealloc(x);}
+void pdp_imageproc_conv_setmin1(void *x, float val){setvec(((t_conv *)x)->min1, val);}
+void pdp_imageproc_conv_setzero(void *x, float val){setvec(((t_conv *)x)->zero, val);}
+void pdp_imageproc_conv_setplus1(void *x, float val){setvec(((t_conv *)x)->plus1, val);}
+void pdp_imageproc_conv_setbordercolor(void *x, float val){setvec(((t_conv *)x)->border, val);}
+void pdp_imageproc_conv_setorientation(void *x, u32 val){((t_conv *)x)->orientation = val;}
+void pdp_imageproc_conv_setnbpasses(void *x, u32 val){((t_conv *)x)->nbpasses = val;}
+void pdp_imageproc_conv_process(void *x, u32 width, u32 height, s16 *image)
+
+{
+    t_conv *d = (t_conv *)x;
+    
+    u32 orientation = d->orientation;
+    u32 nbp = d->nbpasses;
+    u32 i,j;
+
+    if (orientation == PDP_IMAGEPROC_CONV_HORIZONTAL)
+    {
+	for(i=0; i<width*height; i+=width)
+	    for (j=0; j<nbp; j++)
+		pixel_conv_hor_s16(image+i, width>>2, d->border, d->min1);
+    }
+
+    else
+    {
+	for (j=0; j<nbp; j++)
+	    for(i=0; i<width; i +=4) pixel_conv_ver_s16(image+i,  height, width, d->border, d->min1);
+    }
+
+	
+	
+}
+
+// apply a gain to an image
+void *pdp_imageproc_gain_new(void){return(pdp_alloc(8*sizeof(s16)));}
+void pdp_imageproc_gain_delete(void *x){pdp_dealloc(x);}
+void pdp_imageproc_gain_setgain(void *x, float gain)
+{
+    /* convert float to s16 + shift */
+    s16 *d = (s16 *)x;
+    s16 g;
+    int i;
+    float sign;
+    int shift = 0;
+    
+    sign = (gain < 0) ? -1 : 1;
+    gain *= sign;
+
+    /* max shift = 16 */
+    for(i=0; i<=16; i++){
+	if (gain < 0x4000){
+	    gain *= 2;
+	    shift++;
+	}
+	else break;
+    }
+
+    gain *= sign;
+    g = (s16) gain;
+
+    //g = 0x4000;
+    //shift = 14;
+
+    d[0]=g;
+    d[1]=g;
+    d[2]=g;
+    d[3]=g;
+    d[4]=(s16)shift;
+    d[5]=0;
+    d[6]=0;
+    d[7]=0;
+}
+void pdp_imageproc_gain_process(void *x, u32 width, u32 height, s16 *image)
+{
+    s16 *d = (s16 *)x;
+    pixel_gain_s16(image, (width*height)>>2, d, (u64 *)(d+4));
+}
+
+// colour rotation for 2 colour planes
+void *pdp_imageproc_crot2d_new(void){return pdp_alloc(16*sizeof(s16));}
+void pdp_imageproc_crot2d_delete(void *x){pdp_dealloc(x);}
+void pdp_imageproc_crot2d_setmatrix(void *x, float *matrix)
+{
+    s16 *d = (s16 *)x;
+    setvec(d, matrix[0]);
+    setvec(d+4, matrix[1]);
+    setvec(d+8, matrix[2]);
+    setvec(d+12, matrix[3]);
+}
+void pdp_imageproc_crot2d_process(void *x, s16 *image, u32 width, u32 height)
+{
+    s16 *d = (s16 *)x;
+    pixel_crot2d_s16(image, width*height >> 2, d);
+}
+
+// biquad and biquad time
+typedef struct
+{
+    s16 ma1[4];
+    s16 ma2[4];
+    s16 b0[4];
+    s16 b1[4];
+    s16 b2[4];
+    s16 u0[4];
+    s16 u1[4];
+    s16 u0_save[4];
+    s16 u1_save[4];
+    u32 nbpasses;
+    u32 direction;
+} t_bq;
+
+void *pdp_imageproc_bq_new(void){return pdp_alloc(sizeof(t_bq));}
+void pdp_imageproc_bq_delete(void *x){pdp_dealloc(x);}
+void pdp_imageproc_bq_setcoef(void *x, float *coef) // a0,-a1,-a2,b0,b1,b2,u0,u1
+{
+    t_bq *d = (t_bq *)x;
+    float ia0 = 1.0f / coef[0];
+
+    /* all coefs are s1.14 fixed point */
+    /* representing values -2 < x < 2  */
+    /* so scale down before using the ordinary s0.15 float->fixed routine */
+
+    ia0 *= 0.5f;
+
+    // coef
+    setvec(d->ma1, ia0*coef[1]);
+    setvec(d->ma2, ia0*coef[2]);
+    setvec(d->b0, ia0*coef[3]);
+    setvec(d->b1, ia0*coef[4]);
+    setvec(d->b2, ia0*coef[5]);
+
+    // state to reset too
+    setvec(d->u0_save, coef[6]);
+    setvec(d->u1_save, coef[7]);
+
+}
+void pdp_imageproc_bq_setnbpasses(void *x, u32 nbpasses){((t_bq *)x)->nbpasses = nbpasses;}
+void pdp_imageproc_bq_setdirection(void *x, u32 direction){((t_bq *)x)->direction = direction;}
+void pdp_imageproc_bq_process(void *x, u32 width, u32 height, s16* image);
+
+
+void pdp_imageproc_bqt_process(void *x, u32 width, u32 height, s16 *image, s16 *state0, s16 *state1)
+{
+    s16 *d = (s16 *)x;
+    pixel_biquad_time_s16(image, state0, state1, d, (width*height)>>2);
+}
+
+void pdp_imageproc_bq_process(void *x, u32 width, u32 height, s16 *image)
+{
+    t_bq *d = (t_bq *)x;
+    s16 *c = d->ma1; /* coefs */
+    s16 *s = d->u0;  /* state */
+    u32 direction = d->direction;
+    u32 nbp = d->nbpasses;
+    unsigned int i,j;
+
+
+
+    /* VERTICAL */
+
+    if ((direction & PDP_IMAGEPROC_BIQUAD_TOP2BOTTOM)
+	&& (direction &  PDP_IMAGEPROC_BIQUAD_BOTTOM2TOP)){
+
+	for(i=0; i<width; i +=4){
+	    for (j=0; j<nbp; j++){
+		pixel_biquad_vertb_s16(image+i,    height>>2, width, c, s);
+		pixel_biquad_verbt_s16(image+i,    height>>2, width, c, s);
+	    }
+	}
+    }
+
+    else if (direction & PDP_IMAGEPROC_BIQUAD_TOP2BOTTOM){
+	for(i=0; i<width; i +=4){
+	    for (j=0; j<nbp; j++){
+		pixel_biquad_vertb_s16(image+i,    height>>2, width, c, s);
+	    }
+	}
+    }
+
+    else if (direction & PDP_IMAGEPROC_BIQUAD_BOTTOM2TOP){
+	for(i=0; i<width; i +=4){
+	    for (j=0; j<nbp; j++){
+		pixel_biquad_verbt_s16(image+i,    height>>2, width, c, s);
+	    }
+	}
+    }
+
+    /* HORIZONTAL */
+
+    if ((direction & PDP_IMAGEPROC_BIQUAD_LEFT2RIGHT)
+	&& (direction & PDP_IMAGEPROC_BIQUAD_RIGHT2LEFT)){
+
+	for(i=0; i<(width*height); i +=(width<<2)){
+	    for (j=0; j<nbp; j++){
+		pixel_biquad_horlr_s16(image+i,    width>>2, width, c, s);
+		pixel_biquad_horrl_s16(image+i,    width>>2, width, c, s);
+	    }
+	}
+    }
+
+    else if (direction & PDP_IMAGEPROC_BIQUAD_LEFT2RIGHT){
+	for(i=0; i<(width*height); i +=(width<<2)){
+	    for (j=0; j<nbp; j++){
+		pixel_biquad_horlr_s16(image+i,    width>>2, width, c, s);
+	    }
+	}
+    }
+
+    else if (direction & PDP_IMAGEPROC_BIQUAD_RIGHT2LEFT){
+	for(i=0; i<(width*height); i +=(width<<2)){
+	    for (j=0; j<nbp; j++){
+		pixel_biquad_horrl_s16(image+i,    width>>2, width, c, s);
+	    }
+	}
+    }
+
+}
+
+// produce a random image
+// note: random number generator can be platform specific
+// however, it should be seeded. (same seed produces the same result)
+void *pdp_imageproc_random_new(void){return pdp_alloc(4*sizeof(s16));}
+void pdp_imageproc_random_delete(void *x){pdp_dealloc(x);}
+void pdp_imageproc_random_setseed(void *x, float seed)
+{
+    s16 *d = (s16 *)x;
+    srandom((u32)seed);
+    d[0] = (s16)random();
+    d[1] = (s16)random();
+    d[2] = (s16)random();
+    d[3] = (s16)random();
+    
+}
+void pdp_imageproc_random_process(void *x, u32 width, u32 height, s16 *image)
+{
+    s16 *d = (s16 *)x;
+    unsigned int totalnbpixels = width * height;
+    pixel_rand_s16(image, totalnbpixels>>2, d);
+}
+
+
+/* resampling stuff
+   this is quite a zoo of data structures
+   the major point is this: the resampler mmx code is shared for all resampling code
+   it uses data specified in t_resample_cbrd (Cooked Bilinear Resampler Data)
+
+   then the there are several feeder algorithms. one is the linear mapper. it's
+   data is specified in t_resample_clrd (Cooked Linear Remapper Data)
+
+   for each feeder algorithm, there are several high level algorithms. like zoom,
+   rotate, ... 
+*/
+
+typedef struct
+{
+    u32 lineoffset;
+    s16 *image;
+    u32 width;
+    u32 height;
+    
+} t_resample_id; // Image Data
+
+/* initialize image meta data (dimensions + location) */
+static void pdp_imageproc_resample_init_id(t_resample_id *x, u32 offset, s16* image, u32 w, u32 h)
+{
+    x->lineoffset = offset;
+    x->image = image;
+    x->width = w;
+    x->height = h;
+}
+
+// mmx resampling source image resampling data + coefs
+typedef struct
+{
+    // vector data for resampling routine (resampling computation)
+    u8  reserved[0x60];  //internal data
+    s16 *address[2];     //64 bit splatted offset address
+    s16 twowidthm1[4];   //64 bit splatted 2*(width-1)
+    s16 twoheightm1[4];  //64 bit splatted 2*(height-1)
+    s16 lineoffset[4];   //64 bit splatted line offset in pixels
+
+} t_resample_cid; // Cooked Image Data
+
+/* convert image meta data into a cooked format used by the resampler routine */
+static void pdp_imageproc_resample_init_cid(t_resample_cid *r, t_resample_id *i)
+{
+    u32 twowm1 = (i->width-1)<<1;
+    u32 twohm1 = (i->height-1)<<1;
+    r->address[0] = i->image;
+    r->address[1] = i->image;
+    r->twowidthm1[0] = twowm1;
+    r->twowidthm1[1] = twowm1;
+    r->twowidthm1[2] = twowm1;
+    r->twowidthm1[3] = twowm1;
+    r->twoheightm1[0] = twohm1;
+    r->twoheightm1[1] = twohm1;
+    r->twoheightm1[2] = twohm1;
+    r->twoheightm1[3] = twohm1;
+    r->lineoffset[0] = i->lineoffset;
+    r->lineoffset[1] = i->lineoffset;
+    r->lineoffset[2] = i->lineoffset;
+    r->lineoffset[3] = i->lineoffset;
+}
+
+// linear mapping data struct (zoom, scale, rotate, shear, ...)
+typedef struct
+{
+    s32 rowstatex[2]; // row state x coord
+    s32 rowstatey[2]; // row state y coord
+    s32 colstatex[2]; // column state x coord
+    s32 colstatey[2]; // column state y coord
+    s32 rowincx[2];   // row inc vector x coord
+    s32 rowincy[2];   // row inc vector y coord
+    s32 colincx[2];   // column inc vector x coord
+    s32 colincy[2];   // column inc vector y coord
+} t_resample_clmd; // Cooked Linear Mapping Data
+
+/* convert incremental linear remapping vectors to internal cooked format */
+static void pdp_imageproc_resample_cookedlinmap_init(t_resample_clmd *l, s32 sx, s32 sy, s32 rix, s32 riy, s32 cix, s32 ciy)
+{
+    l->colstatex[0] = l->rowstatex[0] = sx;
+    l->colstatex[1] = l->rowstatex[1] = sx + rix;
+    l->colstatey[0] = l->rowstatey[0] = sy;
+    l->colstatey[1] = l->rowstatey[1] = sy + riy;
+    l->rowincx[0] = rix << 1;
+    l->rowincx[1] = rix << 1;
+    l->rowincy[0] = riy << 1;
+    l->rowincy[1] = riy << 1;
+    l->colincx[0] = cix;
+    l->colincx[1] = cix;
+    l->colincy[0] = ciy;
+    l->colincy[1] = ciy;
+}
+
+
+/* this struct contains all the data necessary for
+   bilin interpolation from src -> dst image
+   (src can be == dst) */
+typedef struct
+{
+    t_resample_cid csrc;     //cooked src image meta data for bilinear interpolator
+    t_resample_id src;       //src image meta
+    t_resample_id dst;       //dst image meta
+} t_resample_cbrd;            //Bilinear Resampler Data
+
+
+/* this struct contains high level zoom parameters,
+   all image relative */
+typedef struct
+{
+    float centerx;
+    float centery;
+    float zoomx;
+    float zoomy;
+    float angle;
+} t_resample_zrd;
+
+
+/* convert floating point center and zoom data to incremental linear remapping vectors */
+static void pdp_imageproc_resample_clmd_init_from_id_zrd(t_resample_clmd *l, t_resample_id *i, t_resample_zrd *z)
+{
+    double izx = 1.0f / (z->zoomx);
+    double izy = 1.0f / (z->zoomy);
+    double scale = (double)0xffffffff;
+    double scalew = scale / ((double)(i->width - 1));
+    double scaleh = scale / ((double)(i->height - 1));
+    double cx = ((double)z->centerx) * ((double)(i->width - 1));
+    double cy = ((double)z->centery) * ((double)(i->height - 1));
+    double angle = z->angle * (-M_PI / 180.0);
+    double c = cos(angle);
+    double s = sin(angle);
+
+    /* affine x, y mappings in screen coordinates */
+    double mapx(double x, double y){return cx + izx * ( c * (x-cx) + s * (y-cy));}
+    double mapy(double x, double y){return cy + izy * (-s * (x-cx) + c * (y-cy));}
+
+    u32 tl_x = (u32)(scalew * mapx(0,0));
+    u32 tl_y = (u32)(scaleh * mapy(0,0));
+
+
+    u32 row_inc_x = (u32)(scalew * (mapx(1,0)-mapx(0,0)));
+    u32 row_inc_y = (u32)(scaleh * (mapy(1,0)-mapy(0,0)));
+    u32 col_inc_x = (u32)(scalew * (mapx(0,1)-mapx(0,0)));
+    u32 col_inc_y = (u32)(scaleh * (mapy(0,1)-mapy(0,0)));
+
+
+    pdp_imageproc_resample_cookedlinmap_init(l, tl_x, tl_y, row_inc_x, row_inc_y, col_inc_x, col_inc_y);
+}
+
+/* this struct contains all data for the zoom object */
+typedef struct
+{
+    t_resample_cbrd cbrd;      // Bilinear Resampler Data
+    t_resample_clmd clmd;      // Cooked Linear Mapping data
+    t_resample_zrd   zrd;      // Zoom / Rotate Data
+} t_resample_zoom_rotate;
+
+// zoom + rotate
+void *pdp_imageproc_resample_affinemap_new(void)
+{
+    t_resample_zoom_rotate *z = (t_resample_zoom_rotate *)pdp_alloc(sizeof(t_resample_zoom_rotate));
+    z->zrd.centerx = 0.5;
+    z->zrd.centery = 0.5;
+    z->zrd.zoomx = 1.0;
+    z->zrd.zoomy = 1.0;
+    z->zrd.angle = 0.0f;
+    return (void *)z;
+}
+void pdp_imageproc_resample_affinemap_delete(void *x){pdp_dealloc(x);}
+void pdp_imageproc_resample_affinemap_setcenterx(void *x, float f){((t_resample_zoom_rotate *)x)->zrd.centerx = f;}
+void pdp_imageproc_resample_affinemap_setcentery(void *x, float f){((t_resample_zoom_rotate *)x)->zrd.centery = f;}
+void pdp_imageproc_resample_affinemap_setzoomx(void *x, float f){((t_resample_zoom_rotate *)x)->zrd.zoomx = f;}
+void pdp_imageproc_resample_affinemap_setzoomy(void *x, float f){((t_resample_zoom_rotate *)x)->zrd.zoomy = f;}
+void pdp_imageproc_resample_affinemap_setangle(void *x, float f){((t_resample_zoom_rotate *)x)->zrd.angle = f;}
+void pdp_imageproc_resample_affinemap_process(void *x, u32 width, u32 height, s16 *srcimage, s16 *dstimage)
+{
+    t_resample_zoom_rotate *z = (t_resample_zoom_rotate *)x;
+
+    /* setup resampler image meta data */
+    pdp_imageproc_resample_init_id(&(z->cbrd.src), width, srcimage, width, height);
+    pdp_imageproc_resample_init_id(&(z->cbrd.dst), width, dstimage, width, height);
+    pdp_imageproc_resample_init_cid(&(z->cbrd.csrc),&(z->cbrd.src)); 
+
+    /* setup linmap data from zoom_rotate parameters */
+    pdp_imageproc_resample_clmd_init_from_id_zrd(&(z->clmd), &(z->cbrd.src), &(z->zrd));
+
+
+    /* call assembler routine */
+    pixel_resample_linmap_s16(z);   
+}
+
+
+
+// polynomials
+
+
+typedef struct
+{
+    u32 order;
+    u32 nbpasses;
+    s16 coefs[0];
+} t_cheby;
+
+void *pdp_imageproc_cheby_new(int order)
+{
+    t_cheby *z;
+    int i;
+    if (order < 2) order = 2;
+    z = (t_cheby *)pdp_alloc(sizeof(t_cheby) + (order + 1) * sizeof(s16[4]));
+    z->order = order;
+    setvec(z->coefs + 0*4, 0);
+    setvec(z->coefs + 1*4, 0.25);
+    for (i=2; i<=order; i++)  setvec(z->coefs + i*4, 0);
+
+    return z;
+}
+void pdp_imageproc_cheby_delete(void *x){pdp_dealloc(x);}
+void pdp_imageproc_cheby_setcoef(void *x, u32 n, float f)
+{
+    t_cheby *z = (t_cheby *)x;
+    if (n <= z->order){
+	setvec(z->coefs + n*4, f * 0.25); // coefs are in s2.13 format
+    }
+}
+void pdp_imageproc_cheby_setnbpasses(void *x, u32 n){((t_cheby *)x)->nbpasses = n;}
+
+void pdp_imageproc_cheby_process(void *x, u32 width, u32 height, s16 *image)
+{
+    t_cheby *z = (t_cheby *)x;
+    u32 iterations = z->nbpasses;
+    u32 i,j;
+    for (j=0; j < (height*width); j += width)
+	for (i=0; i<iterations; i++)
+	    pixel_cheby_s16_3plus(image+j, width>>2, z->order+1, z->coefs);
+
+    //pixel_cheby_s16_3plus(image, (width*height)>>2, z->order+1, z->coefs);
+}
diff --git a/system/image/pdp_imageproc_portable.c b/system/image/pdp_imageproc_portable.c
new file mode 100644
index 0000000..53f195f
--- /dev/null
+++ b/system/image/pdp_imageproc_portable.c
@@ -0,0 +1,679 @@
+/*
+ *   Pure Data Packet. portable image processing routines.
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include "pdp_imageproc.h"
+
+/* pdp memory alloc/dealloc prototype */
+void *pdp_alloc(int size);
+void pdp_dealloc(void *);
+
+
+// utility stuff
+inline static s32 float2fixed(float f)
+{
+    if (f > 1) f = 1;
+    if (f < -1) f = -1;
+    f *= 0x7fff;
+    return (s32)f;
+}
+
+
+
+#define CLAMP16(x) (((x) > 0x7fff) ? 0x7fff : (((x) < -0x7fff) ? -0x7fff : (x)))
+
+// add two images
+void pdp_imageproc_add_process(void *x, u32 width, u32 height, s16 *image, s16 *image2)
+{
+    int a, b;
+    unsigned int i;
+    for (i=0; i<width*height; i++){
+	a = (int)image[i];
+	b = (int)image2[i];
+	image[i] = (s16)(CLAMP16(a+b));
+    }
+    
+}
+
+// mul two images
+void pdp_imageproc_mul_process(void *x, u32 width, u32 height, s16 *image, s16 *image2)
+{
+    int a, b;
+    unsigned int i;
+    for (i=0; i<width*height; i++){
+	a = (int)image[i];
+	b = (int)image2[i];
+	image[i] = (s16)((a*b)>>15);
+    }
+    
+}
+
+// mix 2 images
+void *pdp_imageproc_mix_new(void){return pdp_alloc(2*sizeof(s32));}
+void pdp_imageproc_mix_delete(void *x) {pdp_dealloc (x);}
+void pdp_imageproc_mix_setleftgain(void *x, float gain)
+{
+    s32 *d = (s32 *)x;
+    d[0] = float2fixed(gain);
+}
+void pdp_imageproc_mix_setrightgain(void *x, float gain)
+{
+    s32 *d = (s32 *)x;
+    d[1] = float2fixed(gain);
+}
+void pdp_imageproc_mix_process(void *x, u32 width, u32 height, s16 *image, s16 *image2)
+{
+    s32 *d = (s32 *)x;
+    u32 i;
+    s32 a,b;
+
+    for(i=0; i<width*height; i++){
+	a = (s32)image[i];
+	b = (s32)image2[i];
+	a = (a*d[0] + b*d[1]) >> 15;
+	image[i] = (s16)CLAMP16(a);
+    }
+	
+}
+
+
+// random mix 2 images
+void *pdp_imageproc_randmix_new(void){return pdp_alloc(2*sizeof(s32));;}
+void pdp_imageproc_randmix_delete(void *x) {pdp_dealloc(x);}
+void pdp_imageproc_randmix_setthreshold(void *x, float threshold)
+{
+    s32 *d = (s32 *)x;
+    if (threshold > 1.0f) threshold = 1.0f;
+    if (threshold < 0.0f) threshold = 0.0f;
+    d[0] = float2fixed(threshold);
+}
+void pdp_imageproc_randmix_setseed(void *x, float seed)
+{
+    s32 *d = (s32 *)x;
+    d[1] = float2fixed(seed);
+}
+void pdp_imageproc_randmix_process(void *x, u32 width, u32 height, s16 *image, s16 *image2)
+{
+    s32 *d = (s32 *)x;
+    u32 i;
+    s16 r;
+    srandom((u32)d[1]);
+
+
+    for(i=0; i<width*height; i++){
+	// get a random val between 0 and 0x7fff
+	r = (s16)(random() & 0x7fff);
+	if (r < d[0]) image[i] = image2[i];
+    }
+}
+
+
+// 3x1 or 1x3 in place convolution
+// orientation
+void *pdp_imageproc_conv_new(void){return(pdp_alloc(6*sizeof(s32)));}
+void pdp_imageproc_conv_delete(void *x){pdp_dealloc(x);}
+void pdp_imageproc_conv_setmin1(void *x, float val)
+{
+    s32 *d = (s32 *)x;
+    d[0] = float2fixed(val);
+}
+void pdp_imageproc_conv_setzero(void *x, float val)
+{
+    s32 *d = (s32 *)x;
+    d[1] = float2fixed(val);
+}
+void pdp_imageproc_conv_setplus1(void *x, float val)
+{
+    s32 *d = (s32 *)x;
+    d[2] = float2fixed(val);
+}
+void pdp_imageproc_conv_setbordercolor(void *x, float val)
+{
+    s32 *d = (s32 *)x;
+    d[3] = float2fixed(val);
+}
+void pdp_imageproc_conv_setorientation(void *x, u32 val){((u32 *)x)[4] = val;}
+void pdp_imageproc_conv_setnbpasses(void *x, u32 val){((u32 *)x)[5] = val;}
+
+static inline void pdp_imageproc_conv_scanline(void *x, s16 *data, u32 count, s32 stride)
+{
+    s32 *d = (s32 *)x;
+    s32 a,b,c,r;
+    u32 i;
+
+    a = d[3]; //border
+    b = data[0];
+    c = data[stride];
+
+    for(i = 0; i < count-2; i++){
+	r = a*d[0] + b*d[1] + c*d[2];
+	a = data[0];
+	b = data[stride];
+	c = data[stride<<1];
+	data[0] = (s16)CLAMP16(r>>15);
+	data += stride;
+    }
+    r = a*d[0] + b*d[1] + c*d[2];
+    a = data[0];
+    b = data[stride];
+    c = d[3]; //border
+    data[0] = (s16)CLAMP16(r>>15);
+    r = a*d[0] + b*d[1] + c*d[2];
+    data[stride] = (s16)CLAMP16(r>>15);
+
+}
+
+void pdp_imageproc_conv_process(void *x, u32 width, u32 height, s16 *image)
+{
+    s32 *d = (s32 *)x;
+    u32 i, j;
+    u32 orientation = d[4];
+    u32 nbp = d[5];
+    if (orientation == PDP_IMAGEPROC_CONV_HORIZONTAL){
+	for(i=0; i<width*height; i+=width)
+	    for(j=0; j<nbp; j++)
+		pdp_imageproc_conv_scanline(x, image+i, width, 1);
+
+    }
+
+    if (orientation == PDP_IMAGEPROC_CONV_VERTICAL){
+	for(i=0; i<width; i++)
+	    for(j=0; j<nbp; j++)
+		pdp_imageproc_conv_scanline(x, image+i, height, width);
+
+    }
+
+
+
+	
+}
+
+// apply a gain to an image
+void *pdp_imageproc_gain_new(void){return(pdp_alloc(2*sizeof(s32)));}
+void pdp_imageproc_gain_delete(void *x){pdp_dealloc(x);}
+void pdp_imageproc_gain_setgain(void *x, float gain)
+{
+    /* convert float to s16 + shift */
+    s32 *d = (s32 *)x;
+    s32 g;
+    int i;
+    float sign;
+    s32 shift = 0;
+    
+    sign = (gain < 0) ? -1 : 1;
+    gain *= sign;
+
+    /* max shift = 16 */
+    for(i=0; i<=16; i++){
+	if (gain < 0x4000){
+	    gain *= 2;
+	    shift++;
+	}
+	else break;
+    }
+
+    gain *= sign;
+    g = (s32) gain;
+
+    //g = 0x4000;
+    //shift = 14;
+
+    d[0]=g;
+    d[1]=shift;
+}
+void pdp_imageproc_gain_process(void *x, u32 width, u32 height, s16 *image)
+{
+    s32 *d = (s32 *)x;
+    s32 a;
+    u32 i;
+    for (i=0; i<width*height; i++){
+	a = (s32)image[i];
+	image[i] = (s16)(CLAMP16((a * d[0]) >> d[1]));
+    }
+}
+
+// colour rotation for 2 colour planes
+void *pdp_imageproc_crot2d_new(void){return pdp_alloc(4*sizeof(s32));}
+void pdp_imageproc_crot2d_delete(void *x){pdp_dealloc(x);}
+void pdp_imageproc_crot2d_setmatrix(void *x, float *matrix)
+{
+    s32 *d = (s32 *)x;
+    d[0] = float2fixed(matrix[0]);
+    d[1] = float2fixed(matrix[1]);
+    d[2] = float2fixed(matrix[2]);
+    d[3] = float2fixed(matrix[3]);
+
+}
+void pdp_imageproc_crot2d_process(void *x, s16 *image, u32 width, u32 height)
+{
+    s32 *d = (s32 *)x;
+    u32 i,j;
+    s32 a1,a2,c1,c2;
+
+    for(i=0, j=width*height; i<width*height; i++, j++){
+	c1 = (s32)image[i];
+	c2 = (s32)image[j];
+	
+	a1 = d[0] * c1;
+	a2 = d[1] * c1;
+	a1+= d[2] * c2;
+	a2+= d[3] * c2;
+
+	a1 >>= 15;
+	a2 >>= 15;
+
+	image[i] = (s16)CLAMP16(a1);
+	image[j] = (s16)CLAMP16(a2);
+    }
+}
+
+// biquad and biquad time
+typedef struct
+{
+    s32 ma1;
+    s32 ma2;
+    s32 b0;
+    s32 b1;
+    s32 b2;
+
+    s32 u0;
+    s32 u1;
+
+    s32 u0_save;
+    s32 u1_save;
+
+    u32 nbpasses;
+    u32 direction;
+} t_bq;
+void *pdp_imageproc_bq_new(void){return pdp_alloc(sizeof(t_bq));}
+void pdp_imageproc_bq_delete(void *x){pdp_dealloc(x);}
+void pdp_imageproc_bq_setnbpasses(void *x, u32 i){((t_bq *)x)->nbpasses = i;}
+void pdp_imageproc_bq_setdirection(void *x, u32 i){((t_bq *)x)->direction = i;}
+void pdp_imageproc_bq_setcoef(void *x, float *coef) // a0,-a1,-a2,b0,b1,b2,u0,u1
+{
+    s32 *d = (s32 *)x;
+    float ia0 = 1.0f / coef[0];
+
+    /* all coefs are s1.14 fixed point */
+    /* representing values -2 < x < 2  */
+    /* so scale down before using the ordinary s0.15 float->fixed routine */
+
+    ia0 *= 0.5f;
+
+    // coef
+    d[0] = float2fixed(ia0*coef[1]); // -a1
+    d[1] = float2fixed(ia0*coef[2]); // -a2
+    d[2] = float2fixed(ia0*coef[3]); // b0
+    d[3] = float2fixed(ia0*coef[4]); // b1
+    d[4] = float2fixed(ia0*coef[5]); // b2
+
+
+    // state to reset too
+    d[5] = float2fixed(coef[6]);
+    d[6] = float2fixed(coef[7]);
+
+}
+
+#define A1 d[0]
+#define A2 d[1]
+#define B0 d[2]
+#define B1 d[3]
+#define B2 d[4]
+/*
+ 	# DIRECT FORM II BIQUAD (from pixel_biquad_s16.s)
+ 	#
+ 	# y[k]  = b0 * x[k] + u1[k-1]
+ 	# u1[k] = b1 * x[k] + u2[k-1] - a1 * y[k]
+	# u2[k] = b2 * x[k]           - a2 * y[k]
+*/
+
+/* remark A1 and A2 are already negated) */
+
+
+static inline void pdp_imageproc_bq_scanline(void *x, s16 *data, u32 count, s32 stride)
+{
+
+    s32 *d = (s32 *)x;
+    s32 u1,u2, xx, yy;
+
+    u32 i;
+
+    u1 = d[7];
+    u2 = d[8];
+
+    for(i = 0; i < count; i++){
+
+	xx = (s32)data[0];
+
+	yy = ((B0 * xx)>>14) + u1;
+	u1 = ((B1 * xx)>>14) + u2 + ((A1 * yy)>>14);
+	u2 = ((B2 * xx)>>14)      + ((A2 * yy)>>14);
+
+	data[0] = (s16)CLAMP16(yy);
+
+	data += stride;
+
+    }
+
+    d[7] = u1;
+    d[8] = u2;
+
+}
+
+void pdp_imageproc_bqt_process(void *x, u32 width, u32 height, s16 *image, s16 *state1, s16 *state2)
+{
+    s32 *d = (s32 *)x;
+    u32 i;
+    s32 u1, u2, xx, yy;
+
+    for (i=0; i<width*height; i++){
+
+	xx = (s32)image[i];
+	u1 = (s32)state1[i];
+	u2 = (s32)state2[i];
+
+	yy = ((B0 * xx)>>14) + u1;
+	u1 = ((B1 * xx)>>14) + u2 + ((A1 * yy)>>14);
+	u2 = ((B2 * xx)>>14)      + ((A2 * yy)>>14);
+
+	image[i] = (s16)CLAMP16(yy);
+	state1[i] = (s16)CLAMP16(u1);
+	state2[i] = (s16)CLAMP16(u2);
+    }
+	
+	
+}
+
+void pdp_imageproc_bq_process(void *x, u32 width, u32 height, s16 *data)
+{
+    s32 *d = (s32 *)x;
+    
+    u32 nbp = d[9];
+    u32 direction = d[10];
+    unsigned int i,j, offset;
+
+
+    /* VERTICAL */
+    offset = (height-1)*width;
+
+    if ((direction & PDP_IMAGEPROC_BIQUAD_TOP2BOTTOM)
+	&& (direction &  PDP_IMAGEPROC_BIQUAD_BOTTOM2TOP)){
+
+	for(i=0; i<width; i++){
+	    for (j=0; j<nbp; j++){
+		pdp_imageproc_bq_scanline(x, data+i, height, width); //T->B
+		pdp_imageproc_bq_scanline(x, data+offset+i, height, -width); //B->T
+	    }
+	}
+    }
+
+    else if (direction & PDP_IMAGEPROC_BIQUAD_TOP2BOTTOM){
+	for(i=0; i<width; i++){
+	    for (j=0; j<nbp; j++){
+		pdp_imageproc_bq_scanline(x, data+i, height, width); //T->B
+	    }
+	}
+    }
+
+    else if (direction & PDP_IMAGEPROC_BIQUAD_BOTTOM2TOP){
+	for(i=0; i<width; i++){
+	    for (j=0; j<nbp; j++){
+		pdp_imageproc_bq_scanline(x, data+offset+i, height, -width); //B->T
+	    }
+	}
+    }
+
+    /* HORIZONTAL */
+
+    offset = width-1;
+    if ((direction & PDP_IMAGEPROC_BIQUAD_LEFT2RIGHT)
+	&& (direction & PDP_IMAGEPROC_BIQUAD_RIGHT2LEFT)){
+
+	for(i=0; i<(width*height); i += width){
+	    for (j=0; j<nbp; j++){
+		pdp_imageproc_bq_scanline(x, data+i, width, 1); //L->R
+		pdp_imageproc_bq_scanline(x, data+offset+i, width, -1); //R->L
+	    }
+	}
+    }
+
+    else if (direction & PDP_IMAGEPROC_BIQUAD_LEFT2RIGHT){
+	for(i=0; i<(width*height); i += width){
+	    for (j=0; j<nbp; j++){
+		pdp_imageproc_bq_scanline(x, data+i, width, 1); //L->R
+	    }
+	}
+    }
+
+    else if (direction & PDP_IMAGEPROC_BIQUAD_RIGHT2LEFT){
+	for(i=0; i<(width*height); i += width){
+	    for (j=0; j<nbp; j++){
+		pdp_imageproc_bq_scanline(x, data+offset+i, width, -1); //R->L
+
+	    }
+	}
+    }
+
+}
+
+// produce a random image
+// note: random number generator can be platform specific
+// however, it should be seeded. (same seed produces the same result)
+void *pdp_imageproc_random_new(void){return pdp_alloc(sizeof(s32));}
+void pdp_imageproc_random_delete(void *x){pdp_dealloc(x);}
+void pdp_imageproc_random_setseed(void *x, float seed)
+{
+    float *f = (float *)x;
+    u32 *d = (u32 *)x;
+    f[0] = seed;
+    srandom(d[0]);
+}
+
+void pdp_imageproc_random_process(void *x, u32 width, u32 height, short int *image)
+{
+    s32 *d = (u32 *)x;
+    u32 i;
+    s32 r;
+    srandom(d[0]);
+    for (i=0; i<(width*height); i++) {
+	r = random();
+	image[i] = r;
+    }
+    d[0] = random();
+}
+
+
+
+/* resampling code */
+// zoom + rotate
+
+/* bilinear resampling core routine */
+/* virtual coordinates are the lowest 16 bits in virt_x and virt_y*/
+static inline s32 pdp_resample_bilin(s16 *image, s32 width, s32 height, s32 virt_x, s32 virt_y)
+{
+
+    s32 fp_x, fp_y, frac_x, frac_y, f, offset, r_1, r_2;
+
+    //virt_x &= 0xffff;
+    //virt_y &= 0xffff;
+
+    fp_x = virt_x * (width - 1);
+    fp_y = virt_y * (height - 1);
+
+    frac_x = fp_x & (0xffff);
+    frac_y = fp_y & (0xffff);
+
+    offset = (fp_x >> 16) + (fp_y >> 16) * width;
+    image += offset;
+
+    f = 0x10000 - frac_x;
+
+    r_1 = ((f * (s32)(image[0])  +  frac_x * (s32)(image[1])))>>16;
+
+    image += width;
+
+    r_2 = ((f * (s32)(image[0])  +  frac_x * (s32)(image[1])))>>16;
+
+    f = 0x10000 - frac_y;
+
+    return ((f * r_1 + frac_y * r_2)>>16);
+    
+}
+
+typedef struct
+{
+    float centerx;
+    float centery;
+    float zoomx;
+    float zoomy;
+    float angle;
+} t_affine_map;
+
+
+void *pdp_imageproc_resample_affinemap_new(void)
+{
+
+    t_affine_map *a  = (t_affine_map *)pdp_alloc(sizeof(t_affine_map));
+    a->centerx = 0.5;
+    a->centery = 0.5;
+    a->zoomx = 1.0;
+    a->zoomy = 1.0;
+    a->angle = 0.0f;
+    return (void *)a;
+}
+
+void pdp_imageproc_resample_affinemap_delete(void *x){pdp_dealloc(x);}
+void pdp_imageproc_resample_affinemap_setcenterx(void *x, float f){((t_affine_map *)x)->centerx = f;}
+void pdp_imageproc_resample_affinemap_setcentery(void *x, float f){((t_affine_map *)x)->centery = f;}
+void pdp_imageproc_resample_affinemap_setzoomx(void *x, float f){((t_affine_map *)x)->zoomx = f;}
+void pdp_imageproc_resample_affinemap_setzoomy(void *x, float f){((t_affine_map *)x)->zoomy = f;}
+void pdp_imageproc_resample_affinemap_setangle(void *x, float f){((t_affine_map *)x)->angle = f;}
+void pdp_imageproc_resample_affinemap_process(void *x, u32 width, u32 height, s16 *srcimage, s16 *dstimage)
+{
+    t_affine_map *a = (t_affine_map *)x;
+    double izx = 1.0f / (a->zoomx);
+    double izy = 1.0f / (a->zoomy);
+    double scale = (double)0xffffffff;
+    double scalew = scale / ((double)(width - 1));
+    double scaleh = scale / ((double)(height - 1));
+    double cx = ((double)a->centerx) * ((double)(width - 1));
+    double cy = ((double)a->centery) * ((double)(height - 1));
+    double angle = a->angle * (-M_PI / 180.0);
+    double c = cos(angle);
+    double s = sin(angle);
+
+    /* affine x, y mappings in screen coordinates */
+    double mapx(double x, double y){return cx + izx * ( c * (x-cx) + s * (y-cy));}
+    double mapy(double x, double y){return cy + izy * (-s * (x-cx) + c * (y-cy));}
+
+    u32 colstate_x = (u32)(scalew * mapx(0,0));
+    u32 colstate_y = (u32)(scaleh * mapy(0,0));
+    u32 rowstate_x = colstate_x;
+    u32 rowstate_y = colstate_y;
+
+    u32 row_inc_x = (u32)(scalew * (mapx(1,0)-mapx(0,0)));
+    u32 row_inc_y = (u32)(scaleh * (mapy(1,0)-mapy(0,0)));
+    u32 col_inc_x = (u32)(scalew * (mapx(0,1)-mapx(0,0)));
+    u32 col_inc_y = (u32)(scaleh * (mapy(0,1)-mapy(0,0)));
+
+    u32 i,j;
+
+    for (j=0; j<height; j++){
+	for (i=0; i<width; i++){
+	    *dstimage++ = pdp_resample_bilin(srcimage, width, height, rowstate_x>>16, rowstate_y>>16);
+	    rowstate_x += row_inc_x;
+	    rowstate_y += row_inc_y;
+	}
+	colstate_x += col_inc_x;
+	colstate_y += col_inc_y;
+	rowstate_x = colstate_x;
+	rowstate_y = colstate_y;
+    }
+
+}
+
+
+
+
+
+// polynomials
+
+
+
+
+typedef struct
+{
+    u32 order;
+    u32 nbpasses;
+    s32 coefs[0];
+} t_cheby;
+
+void *pdp_imageproc_cheby_new(int order)
+{
+    t_cheby *z;
+    int i;
+    if (order < 2) order = 2;
+    z = (t_cheby *)pdp_alloc(sizeof(t_cheby) + (order + 1) * sizeof(s32));
+    z->order = order;
+    z->coefs[0] = 0;
+    z->coefs[1] = 0x7fff;
+    for (i=2; i<=order; i++) z->coefs[i] = 0;
+    return z;
+}
+void pdp_imageproc_cheby_delete(void *x){pdp_dealloc(x);}
+void pdp_imageproc_cheby_setnbpasses(void *x, u32 n){((t_cheby *)x)->nbpasses = n;}
+void pdp_imageproc_cheby_setcoef(void *x, u32 n, float f)
+{
+
+    t_cheby *z = (t_cheby *)x;
+    if (n <= z->order){
+	z->coefs[n] = (s32)(f * 32767.0f); // coefs are in s16.15 format
+    }
+
+}
+void pdp_imageproc_cheby_process(void *x, u32 width, u32 height, s16 *image)
+{
+
+    t_cheby *z = (t_cheby *)x;
+    u32 iterations = z->nbpasses;
+    u32 i,j,k;
+    s32 *c = z->coefs;
+    for (j=0; j < (height*width); j++){
+	s32 acc = (s32)image[j];
+	for (i=0; i<iterations; i++){
+	    s32 T2 = 0x7fff; /* 1 */
+	    s32 T1 = acc;
+	    s32 t;
+	    s32 in = acc;
+	    acc = c[0] + ((in*c[1])>>15);
+	    for (k=2; k<=z->order; k++){
+		t = ((T1*in)>>14) - T2; /* T_n = 2 x T_n-1 - T_n-2 */
+		T2 = T1;
+		T1 = t;
+		acc += ((c[k] * t)>>15);
+	    }
+	}
+	image[j] = (s16)(CLAMP16(acc));
+    }
+}
diff --git a/system/image/pdp_llconv.c b/system/image/pdp_llconv.c
new file mode 100644
index 0000000..7fb17de
--- /dev/null
+++ b/system/image/pdp_llconv.c
@@ -0,0 +1,596 @@
+/*
+ *   Pure Data Packet system implementation. : low level format conversion code
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+/* this file contains low level image conversion code 
+   nominated as "the ugliest part of pdp"
+   some code is mmx, most is not. */
+
+#include "pdp_llconv.h"
+#include "pdp_mmx.h"
+
+
+/* all symbols are C style */
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+
+#define CLAMP8(x) (((x)<0) ? 0 : ((x>255)? 255 : (x)))
+#define CLAMP16(x) (((x)<-0x7fff) ? -0x7fff : ((x>0x7fff) ? 0x7fff : (x)))
+#define FP(x) ((int)(((float)(x)) * 256.0f))
+
+#define CLAMP CLAMP8
+
+/* some prototypes for functions defined elsewhere */
+void llconv_yvu_planar_s16u8(short int *src, unsigned char *dst, unsigned int nbpixels);
+void llconv_yuv_planar_u8s16(unsigned char* source, short int *dest, int nbpixels);
+void llconv_grey_s16u8(short int *src, unsigned char *dst, unsigned int nbpixels);
+void llconv_yvu_planar_u8s16(unsigned char* source, short int *dest, int nbpixels);
+
+
+static inline int rgb2y(int r, int g, int b){return (FP(0.257) * r) + (FP(0.504) * g) + (FP(0.098) * b) + FP(16);}
+static inline int rgb2v(int r, int g, int b){return (FP(0.439) * r) - (FP(0.368) * g) - (FP(0.071) * b) + FP(128);}
+static inline int rgb2u(int r, int g, int b){return -(FP(0.148) * r) - (FP(0.291) * g) + (FP(0.439) * b) + FP(128);}
+
+
+/* swap top to bottom */
+static inline void _exchange_row(char *row1, char *row2, int size)
+{
+    int mask = ~(sizeof(int)-1);
+    int *irow1 = (int *)row1;
+    int *irow2 = (int *)row2;
+
+    /* transfer words */
+    while (size & mask){
+	int tmp = *irow1;
+	*irow1++ = *irow2;
+	*irow2++ = tmp;
+	size -= sizeof(int);
+    }
+
+    row1 = (char *)irow1;
+    row2 = (char *)irow2;
+
+    /* transfer rest bytes */
+    while (size){
+	int tmp = *row1;
+	*row1++ = *row2;
+	*row2++ = tmp;
+	size--;
+    }
+}
+
+void pdp_llconv_flip_top_bottom(char *data, int width, int height, int pixelsize)
+{
+    int linesize = width * pixelsize;
+    int i;
+    char *row1 = data;
+    char *row2 = data + linesize * (height-1);
+
+    if (height <= 1) return;
+    if (width  <= 0) return;
+
+    while (row1 < row2){
+	_exchange_row(row1, row2, linesize);
+	row1 += linesize;
+	row2 -= linesize;
+    }
+}
+
+/* "standard" 8 bit conversion routine */
+static void llconv_rgb2yvu(unsigned char* src, unsigned char* dst, int nbpixels)
+{
+    int r,g,b,y,v,u,i;
+    for (i=0; i<nbpixels; i++){
+	r = src[0];
+	g = src[1];
+	b = src[2];
+
+	y = rgb2y(r,g,b);
+	v = rgb2v(r,g,b);
+	u = rgb2u(r,g,b);
+
+	dst[0] = CLAMP(y>>8);
+	dst[1] = CLAMP(v>>8);
+	dst[2] = CLAMP(u>>8);
+
+	src += 3;
+	dst += 3;
+    }
+}
+
+static void llconv_yvu16planar2rgbpacked(short int *src, unsigned char *dst, int w, int h)
+{
+
+/*
+B = 1.164(Y - 16)                   + 2.018(U - 128)
+G = 1.164(Y - 16) - 0.813(V - 128) - 0.391(U - 128)
+R = 1.164(Y - 16) + 1.596(V - 128)}
+*/
+
+    int r,g,b,y,u,v,b1,g1,r1,y1,xoff,yoff;
+    int size = w*h;
+    int voffset = size;
+    int uoffset = size + (size>>2);
+    int rgboff;
+    int rgbw = w*3;
+    int lumoff = 0;
+    int chromoff = 0;
+
+    for(yoff=0; yoff<w*h; yoff+=2*w){
+	for(xoff=0; xoff<w; xoff+=2){
+
+	    /* calculate offsets */
+	    rgboff = 3 * (xoff + yoff);
+	    lumoff = xoff + yoff;
+	    chromoff =  (xoff >> 1) + (yoff >> 2);
+	    
+	    /* get uv values */
+	    v = src[voffset + chromoff];
+	    u = src[uoffset + chromoff];
+
+	    /* calculate chroma contrib for 2x2 pixblock */
+	    b1 = FP(2.018) * u;
+	    g1 = FP(-0.813) * v + FP(-0.391) * u;
+	    r1 = FP(1.596) * v;
+
+	    /* TOP LEFT */
+
+	    /* top left luma contrib */
+	    y = src[lumoff] << 1;
+	    y1 = FP(1.164) * y;
+	    y1 -= FP(16*256);
+	    
+	    b = (b1 + y1)>>16;
+	    g = (g1 + y1)>>16;
+	    r = (r1 + y1)>>16; 
+
+	    /* store top left rgb pixel */
+	    dst[rgboff+0] = CLAMP8(r);
+	    dst[rgboff+1] = CLAMP8(g);
+	    dst[rgboff+2] = CLAMP8(b);
+
+	    /* TOP RIGHT */
+
+	    /* top right luma contrib */
+	    y = src[lumoff + 1] << 1;
+	    y1 = FP(1.164) * y;
+	    y1 -= FP(16*256);
+	    
+	    b = (b1 + y1)>>16;
+	    g = (g1 + y1)>>16;
+	    r = (r1 + y1)>>16; 
+
+	    /* store top right rgb pixel */
+	    dst[rgboff+3] = CLAMP8(r);
+	    dst[rgboff+4] = CLAMP8(g);
+	    dst[rgboff+5] = CLAMP8(b);
+
+
+	    /* BOTTOM LEFT */
+
+	    /* bottom left luma contrib */
+	    y = src[lumoff+w] << 1;
+	    y1 = FP(1.164) * y;
+	    y1 -= FP(16*256);
+	    
+	    b = (b1 + y1)>>16;
+	    g = (g1 + y1)>>16;
+	    r = (r1 + y1)>>16; 
+
+	    /* store bottom left rgb pixel */
+	    dst[rgboff+rgbw+0] = CLAMP8(r);
+	    dst[rgboff+rgbw+1] = CLAMP8(g);
+	    dst[rgboff+rgbw+2] = CLAMP8(b);
+
+	    /* BOTTOM RIGHT */
+
+	    /* bottom right luma contrib */
+	    y = src[lumoff + w + 1] << 1;
+	    y1 = FP(1.164) * y;
+	    y1 -= FP(16*256);
+	    
+	    b = (b1 + y1)>>16;
+	    g = (g1 + y1)>>16;
+	    r = (r1 + y1)>>16; 
+
+	    /* store bottom right rgb pixel */
+	    dst[rgboff+rgbw+3] = CLAMP8(r);
+	    dst[rgboff+rgbw+4] = CLAMP8(g);
+	    dst[rgboff+rgbw+5] = CLAMP8(b);
+
+	}
+
+    }
+
+}
+
+
+
+/* 8 bit rgb to 16 bit planar subsampled yvu */
+static void llconv_rgb2yvu_planar16sub(unsigned char* src, short int* dst, int w, int h)
+{
+    int r,g,b,y,v,u,i,j,k;
+    int size = w*h;
+
+    int voffset = size;
+    int uoffset = size + (size>>2);
+
+
+    int loffset = w * 3;
+
+    k=0;
+    for (j=0; j<w*h; j+=(w<<1)){
+	k = 3 * j;
+	for (i=0; i<w; i+=2){
+
+
+	    // well, this seems to work... strange though
+	    r = src[k];
+	    g = src[k+1];
+	    b = src[k+2];
+	    
+	    y =  (FP(0.257) * r) + (FP(0.504) * g) + (FP(0.098) * b) + FP(16);
+	    v =  (FP(0.439) * r) - (FP(0.368) * g) - (FP(0.071) * b);
+	    u = -(FP(0.148) * r) - (FP(0.291) * g) + (FP(0.439) * b);
+
+	    dst[i+j] = CLAMP16(y >> 1);
+
+	    r = src[k+3];
+	    g = src[k+4];
+	    b = src[k+5];
+	    
+	    y =  (FP(0.257) * r) + (FP(0.504) * g) + (FP(0.098) * b) + FP(16);
+	    v +=  (FP(0.439) * r) - (FP(0.368) * g) - (FP(0.071) * b);
+	    u += -(FP(0.148) * r) - (FP(0.291) * g) + (FP(0.439) * b);
+
+	    dst[i+j+1] = CLAMP16(y >> 1);
+
+
+
+	    r = src[loffset + k];
+	    g = src[loffset + k+1];
+	    b = src[loffset + k+2];
+	    
+	    y =  (FP(0.257) * r) + (FP(0.504) * g) + (FP(0.098) * b) + FP(16);
+	    v =  (FP(0.439) * r) - (FP(0.368) * g) - (FP(0.071) * b);
+	    u = -(FP(0.148) * r) - (FP(0.291) * g) + (FP(0.439) * b);
+
+	    dst[w+i+j] = CLAMP16(y >> 1);
+
+	    r = src[loffset + k+3];
+	    g = src[loffset + k+4];
+	    b = src[loffset + k+5];
+	    
+	    k += 6;
+
+	    y =  (FP(0.257) * r) + (FP(0.504) * g) + (FP(0.098) * b) + FP(16);
+	    v +=  (FP(0.439) * r) - (FP(0.368) * g) - (FP(0.071) * b);
+	    u += -(FP(0.148) * r) - (FP(0.291) * g) + (FP(0.439) * b);
+
+	    dst[w+i+j+1] = CLAMP16(y >> 1);
+
+	    dst[uoffset+ (i>>1) + (j>>2)] = (CLAMP16(u >> 1));
+	    dst[voffset+ (i>>1) + (j>>2)] = (CLAMP16(v >> 1));
+	}
+    }
+}
+
+
+/* 8 bit rgb to 8 bit planar subsampled yvu */
+static void llconv_rgb2yvu_planar8sub(unsigned char* src, unsigned char *dst, int w, int h)
+{
+    int r,g,b,y,v,u,i,j,k;
+    int size = w*h;
+
+    int voffset = size;
+    int uoffset = size + (size>>2);
+
+
+    int loffset = w * 3;
+
+    k=0;
+    for (j=0; j<w*h; j+=(w<<1)){
+	k = 3 * j;
+	for (i=0; i<w; i+=2){
+
+
+	    // well, this seems to work... strange though
+	    r = src[k];
+	    g = src[k+1];
+	    b = src[k+2];
+	    
+	    y =  (FP(0.257) * r) + (FP(0.504) * g) + (FP(0.098) * b) + FP(16);
+	    v =  (FP(0.439) * r) - (FP(0.368) * g) - (FP(0.071) * b);
+	    u = -(FP(0.148) * r) - (FP(0.291) * g) + (FP(0.439) * b);
+
+	    dst[i+j] = CLAMP8(y >> 8);
+
+	    r = src[k+3];
+	    g = src[k+4];
+	    b = src[k+5];
+	    
+	    y =  (FP(0.257) * r) + (FP(0.504) * g) + (FP(0.098) * b) + FP(16);
+	    v +=  (FP(0.439) * r) - (FP(0.368) * g) - (FP(0.071) * b);
+	    u += -(FP(0.148) * r) - (FP(0.291) * g) + (FP(0.439) * b);
+
+	    dst[i+j+1] = CLAMP8(y >> 8);
+
+
+
+	    r = src[loffset + k];
+	    g = src[loffset + k+1];
+	    b = src[loffset + k+2];
+	    
+	    y =  (FP(0.257) * r) + (FP(0.504) * g) + (FP(0.098) * b) + FP(16);
+	    v =  (FP(0.439) * r) - (FP(0.368) * g) - (FP(0.071) * b);
+	    u = -(FP(0.148) * r) - (FP(0.291) * g) + (FP(0.439) * b);
+
+	    dst[w+i+j] = CLAMP8(y >> 8);
+
+	    r = src[loffset + k+3];
+	    g = src[loffset + k+4];
+	    b = src[loffset + k+5];
+	    
+	    k += 6;
+
+	    y =  (FP(0.257) * r) + (FP(0.504) * g) + (FP(0.098) * b) + FP(16);
+	    v +=  (FP(0.439) * r) - (FP(0.368) * g) - (FP(0.071) * b);
+	    u += -(FP(0.148) * r) - (FP(0.291) * g) + (FP(0.439) * b);
+
+	    dst[w+i+j+1] = CLAMP8(y >> 8);
+
+	    dst[uoffset+ (i>>1) + (j>>2)] = (CLAMP8((u >> 9)+128));
+	    dst[voffset+ (i>>1) + (j>>2)] = (CLAMP8((v >> 9)+128));
+	}
+    }
+}
+
+
+/* 8 bit bgr to 16 bit planar subsampled yvu */
+static void llconv_bgr2yvu_planar16sub(unsigned char* src, short int* dst, int w, int h)
+{
+    int r,g,b,y,v,u,i,j,k;
+    int size = w*h;
+
+    int voffset = size;
+    int uoffset = size + (size>>2);
+
+
+    int loffset = w * 3;
+
+    k=0;
+    for (j=0; j<w*h; j+=(w<<1)){
+	k = 3 * j;
+	for (i=0; i<w; i+=2){
+
+
+	    // well, this seems to work... strange though
+	    b = src[k];
+	    g = src[k+1];
+	    r = src[k+2];
+	    
+	    y =  (FP(0.257) * r) + (FP(0.504) * g) + (FP(0.098) * b) + FP(16);
+	    v =  (FP(0.439) * r) - (FP(0.368) * g) - (FP(0.071) * b);
+	    u = -(FP(0.148) * r) - (FP(0.291) * g) + (FP(0.439) * b);
+
+	    dst[i+j] = CLAMP16(y >> 1);
+
+	    b = src[k+3];
+	    g = src[k+4];
+	    r = src[k+5];
+	    
+	    y =  (FP(0.257) * r) + (FP(0.504) * g) + (FP(0.098) * b) + FP(16);
+	    v +=  (FP(0.439) * r) - (FP(0.368) * g) - (FP(0.071) * b);
+	    u += -(FP(0.148) * r) - (FP(0.291) * g) + (FP(0.439) * b);
+
+	    dst[i+j+1] = CLAMP16(y >> 1);
+
+
+
+	    b = src[loffset + k];
+	    g = src[loffset + k+1];
+	    r = src[loffset + k+2];
+	    
+	    y =  (FP(0.257) * r) + (FP(0.504) * g) + (FP(0.098) * b) + FP(16);
+	    v =  (FP(0.439) * r) - (FP(0.368) * g) - (FP(0.071) * b);
+	    u = -(FP(0.148) * r) - (FP(0.291) * g) + (FP(0.439) * b);
+
+	    dst[w+i+j] = CLAMP16(y >> 1);
+
+	    b = src[loffset + k+3];
+	    g = src[loffset + k+4];
+	    r = src[loffset + k+5];
+	    
+	    k += 6;
+
+	    y =  (FP(0.257) * r) + (FP(0.504) * g) + (FP(0.098) * b) + FP(16);
+	    v +=  (FP(0.439) * r) - (FP(0.368) * g) - (FP(0.071) * b);
+	    u += -(FP(0.148) * r) - (FP(0.291) * g) + (FP(0.439) * b);
+
+	    dst[w+i+j+1] = CLAMP16(y >> 1);
+
+	    dst[uoffset+ (i>>1) + (j>>2)] = (CLAMP16(u >> 1));
+	    dst[voffset+ (i>>1) + (j>>2)] = (CLAMP16(v >> 1));
+	}
+    }
+}
+
+/* these seem to be pretty slow */
+
+static void llconv_yvu2rgb(unsigned char* src, unsigned char* dst, int nbpixels)
+{
+    int r,g,b,y,v,u,i;
+    for (i=0; i<nbpixels; i++){
+	y = src[0];
+	v = src[1];
+	u = src[2];
+
+
+	b = FP(1.164) * (y - 16)                         + FP(2.018) * (u - 128);
+	g = FP(1.164) * (y - 16) - FP(0.813) * (v - 128) - FP(0.391) * (u - 128);
+	r = FP(1.164) * (y - 16) + FP(1.596) * (v - 128);
+
+	dst[0] = CLAMP(r>>8);
+	dst[1] = CLAMP(g>>8);
+	dst[2] = CLAMP(b>>8);
+
+	src += 3;
+	dst += 3;
+    }
+}
+
+
+
+/* convert yvu to yuyv */
+static void llconv_yvu2yuyv(unsigned char *src, unsigned char *dst, unsigned int nbpixels)
+{
+    unsigned int y1, y2, u, v, i;
+
+    for (i = 0; i < nbpixels/2; i++){
+
+	y1 = src[0];
+	y2 = src[3];
+	v = (src[1] + src[4]) >> 1;
+	u = (src[2] + src[5]) >> 1;
+	dst[0] = y1;
+	dst[1] = u;
+	dst[2] = y2;
+	dst[3] = v;
+
+	src += 6;
+	dst += 4;
+
+    }
+
+}
+
+
+
+/* convert yuvu packed 8 bit unsigned to yv12 planar 16bit signed */
+static void llconv_yuyv_packed_u8s16(unsigned char* ucsource, short int *sidest, unsigned int w, unsigned int h)
+{
+    unsigned int i, j;
+    unsigned int *source = (unsigned int *)ucsource;
+
+    unsigned int *dest = (unsigned int *)sidest;
+    unsigned int uoffset = (w*h)>>1;
+    unsigned int voffset = (w*h + ((w*h) >> 2)) >> 1;
+
+    for(j=0; j < (h*w)>>1; j +=(w)){
+	for(i=0; i< (w>>1); i+=2){
+	    unsigned int y,u,v;
+	    unsigned int v00, v01, v10, v11;
+	    v00 = source[i+j];
+	    v01 = source[i+j+1];
+	    v10 = source[i+j+(w>>1)];
+	    v11 = source[i+j+(w>>1)+1];
+	    
+	    // save luma
+	    dest[i+j]          = ((v00 & 0x00ff00ff) << 7);
+	    dest[i+j+1]        = ((v01 & 0x00ff00ff) << 7);
+	    dest[i+j+(w>>1)]   = ((v10 & 0x00ff00ff) << 7);
+	    dest[i+j+(w>>1)+1] = ((v11 & 0x00ff00ff) << 7);
+
+	    // compute chroma
+
+	    // mask out luma & shift right
+	    v00 = (v00 & 0xff00ff00)>>1;
+	    v01 = (v01 & 0xff00ff00)>>1;
+	    v10 = (v10 & 0xff00ff00)>>1;
+	    v11 = (v11 & 0xff00ff00)>>1;
+	    
+	    // average 2 scan lines
+	    v00 += v10;
+	    v01 += v11;
+
+	    // combine
+	    v = (v01 << 16) | (v00 & 0x0000ffff);
+	    u = (v01 & 0xffff0000) | (v00 >> 16);
+
+	    // flip sign bits for u,v
+	    u ^= 0x80008000;
+	    v ^= 0x80008000;
+
+	    // save chroma
+	    dest[uoffset + (i>>1) + (j>>2)] = u;
+	    dest[voffset + (i>>1) + (j>>2)] = v;
+	}
+    }
+
+
+}
+
+#define CONVERT(x,y) ((x) + ((y)<<16))
+
+void pdp_llconv(void *src, int stype, void *dst, int dtype, int w, int h)
+{
+    int conversion = CONVERT(stype, dtype);
+    void *tmpbuf;
+
+    switch(CONVERT(stype, dtype)){
+
+    case CONVERT( RIF_YVU__P411_U8, RIF_YVU__P411_S16 ):
+	llconv_yvu_planar_u8s16((unsigned char*)src, (short int *)dst, w*h);
+	break;
+
+    case CONVERT( RIF_YUV__P411_U8, RIF_YVU__P411_S16 ):
+	llconv_yuv_planar_u8s16((unsigned char*)src, (short int *)dst, w*h);
+	break;
+
+    case CONVERT( RIF_YUYV_P____U8, RIF_YVU__P411_S16 ):
+	llconv_yuyv_packed_u8s16((unsigned char*)src, (short int *)dst, w, h);
+	break;
+
+    case CONVERT( RIF_RGB__P____U8, RIF_YVU__P411_U8 ):
+	llconv_rgb2yvu_planar8sub((unsigned char*) src, (unsigned char*) dst, w, h);
+	break;
+
+    case CONVERT( RIF_RGB__P____U8, RIF_YVU__P411_S16 ):
+	llconv_rgb2yvu_planar16sub((unsigned char*) src, (short int*) dst, w, h);
+	break;
+
+    case CONVERT( RIF_BGR__P____U8, RIF_YVU__P411_S16 ):
+	llconv_bgr2yvu_planar16sub((unsigned char*) src, (short int*) dst, w, h);
+	break;
+
+    case CONVERT( RIF_YVU__P411_S16, RIF_RGB__P____U8 ):
+	llconv_yvu16planar2rgbpacked((short int*) src, (unsigned char*) dst, w, h);
+	break;
+
+    case CONVERT( RIF_YVU__P411_S16, RIF_YVU__P411_U8 ):
+	llconv_yvu_planar_s16u8((short int*)src, (unsigned char*)dst, w*h);
+	break;
+
+    case CONVERT( RIF_GREY______S16, RIF_GREY______U8 ):
+	llconv_grey_s16u8((short int*)src, (unsigned char*)dst, w*h);
+	break;
+    default:
+	post("pdp_llconv: WARNING: no conversion routine defined for (%d)->(%d)", stype, dtype);
+
+    }
+
+}
+
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/system/image/pdp_llconv_mmx.c b/system/image/pdp_llconv_mmx.c
new file mode 100644
index 0000000..8070bac
--- /dev/null
+++ b/system/image/pdp_llconv_mmx.c
@@ -0,0 +1,55 @@
+
+/*
+ *   Pure Data Packet system implementation. : wrapper for mmx low level format conversion code
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+
+#include "pdp_mmx.h"
+
+
+
+/* convert greyscale 8 bit unsigned to 16bit signed */
+void llconv_grey_s16u8(short int *src, unsigned char *dst, unsigned int nbpixels)
+{
+    pixel_pack_s16u8_y(src, dst, nbpixels>>3);
+}
+
+/* convert yvu planar 411 16 bit signed to 8 bit unsigned */
+void llconv_yvu_planar_s16u8(short int *src, unsigned char *dst, unsigned int nbpixels)
+{
+    pixel_pack_s16u8_y(src, dst, nbpixels>>3);
+    pixel_pack_s16u8_uv(src + nbpixels, dst + nbpixels, nbpixels>>4);
+}
+
+
+/* convert yvu planar 411 8 bit unsigned to yv12 planar 16bit signed */
+void llconv_yvu_planar_u8s16(unsigned char* source, short int *dest, int nbpixels)
+{
+    pixel_unpack_u8s16_y(source, dest, nbpixels>>3);
+    pixel_unpack_u8s16_uv(&source[nbpixels], &dest[nbpixels], nbpixels>>4);
+}
+
+/* convert yuv planar 411 8 bit unsigned to yv12 planar 16bit signed */
+void llconv_yuv_planar_u8s16(unsigned char* source, short int *dest, int nbpixels)
+{
+    pixel_unpack_u8s16_y(source, dest, nbpixels>>3);
+    pixel_unpack_u8s16_uv(&source[nbpixels], &dest[nbpixels + (nbpixels>>2)], nbpixels>>5);
+    pixel_unpack_u8s16_uv(&source[nbpixels + (nbpixels>>2)], &dest[nbpixels], nbpixels>>5);
+}
+
diff --git a/system/image/pdp_llconv_portable.c b/system/image/pdp_llconv_portable.c
new file mode 100644
index 0000000..f6d5a44
--- /dev/null
+++ b/system/image/pdp_llconv_portable.c
@@ -0,0 +1,82 @@
+
+/*
+ *   Pure Data Packet system implementation. : portable low level format conversion code
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#define CLAMP(x) (((x)<0) ? 0 : ((x>255)? 255 : (x)))
+#define FP(x) ((int)(((float)(x)) * 256.0f))
+
+void pixel_unpack_portable_u8s16_y(unsigned char *src ,short int *dst, unsigned int nbpixels)
+{
+    unsigned int i;
+    for (i=0; i<nbpixels; i++) dst[i] = ((short int)(src[i])) << 7;
+}
+
+void pixel_unpack_portable_u8s16_uv(unsigned char *src ,short int *dst, unsigned int nbpixels)
+{
+    unsigned int i;
+    for (i=0; i<nbpixels; i++) dst[i] = (((short int)(src[i])) << 8) ^ 0x8000;
+}
+
+
+void pixel_pack_portable_s16u8_y(short int *src, unsigned char *dst, unsigned int nbpixels)
+{
+    unsigned int i;
+    for (i=0; i<nbpixels; i++) dst[i] = (unsigned char)(CLAMP(src[i]>>7));
+}
+
+void pixel_pack_portable_s16u8_uv(short int *src, unsigned char *dst, unsigned int nbpixels)
+{
+    unsigned int i;
+    unsigned short *usrc = (unsigned short *)src;
+    for (i=0; i<nbpixels; i++) dst[i] = ((usrc[i]^0x8000)>>8);
+}
+
+
+/* convert greyscale 8 bit unsigned to 16bit signed */
+void llconv_grey_s16u8(short int *src, unsigned char *dst, unsigned int nbpixels)
+{
+    pixel_pack_portable_s16u8_y(src, dst, nbpixels);
+}
+
+/* convert yvu planar 411 16 bit signed to 8 bit unsigned */
+void llconv_yvu_planar_s16u8(short int *src, unsigned char *dst, unsigned int nbpixels)
+{
+    pixel_pack_portable_s16u8_y(src, dst, nbpixels);
+    pixel_pack_portable_s16u8_uv(src + nbpixels, dst + nbpixels, nbpixels>>1);
+
+}
+
+
+/* convert yvu planar 411 8 bit unsigned to yv12 planar 16bit signed */
+void llconv_yvu_planar_u8s16(unsigned char* source, short int *dest, int nbpixels)
+{
+    pixel_unpack_portable_u8s16_y(source, dest, nbpixels);
+    pixel_unpack_portable_u8s16_uv(&source[nbpixels], &dest[nbpixels], nbpixels>>1);
+}
+
+/* convert yuv planar 411 8 bit unsigned to yv12 planar 16bit signed */
+void llconv_yuv_planar_u8s16(unsigned char* source, short int *dest, int nbpixels)
+{
+    pixel_unpack_portable_u8s16_y(source, dest, nbpixels);
+    pixel_unpack_portable_u8s16_uv(&source[nbpixels], &dest[nbpixels + (nbpixels>>2)], nbpixels>>2);
+    pixel_unpack_portable_u8s16_uv(&source[nbpixels + (nbpixels>>2)], &dest[nbpixels], nbpixels>>2);
+}
+
+
diff --git a/system/image/pdp_resample.c b/system/image/pdp_resample.c
new file mode 100644
index 0000000..d2ffbcd
--- /dev/null
+++ b/system/image/pdp_resample.c
@@ -0,0 +1,204 @@
+/*
+ *   Pure Data Packet system file. - image resampling routines
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+
+#include "pdp_resample.h"
+#include "pdp.h"
+#include <string.h>
+
+/*
+
+efficient bilinear resampling ??
+performance: how to eliminate divides? -> virtual coordinates 2^k x 2^k (conf. opengl)
+
+i.e. 16 bit virtual coordinates: easy modular addressing
+
+*/
+
+
+/* code in this file should go out to be replaced by code in pdp_imageproc */
+
+static s32 pdp_resample_bilin(s16 *image, s32 width, s32 height, s32 virt_x, s32 virt_y)
+{
+
+    s32 fp_x, fp_y, frac_x, frac_y, f, offset, r_1, r_2;
+
+    virt_x &= 0xffff;
+    virt_y &= 0xffff;
+
+    fp_x = virt_x * (width - 1);
+    fp_y = virt_y * (height - 1);
+
+    frac_x = fp_x & (0xffff);
+    frac_y = fp_y & (0xffff);
+
+    offset = (fp_x >> 16) + (fp_y >> 16) * width;
+    image += offset;
+
+    f = 0x10000 - frac_x;
+
+    r_1 = ((f * (s32)(image[0])  +  frac_x * (s32)(image[1])))>>16;
+
+    image += width;
+
+    r_2 = ((f * (s32)(image[0])  +  frac_x * (s32)(image[1])))>>16;
+
+    f = 0x10000 - frac_y;
+
+    return ((f * r_1 + frac_y * r_2)>>16);
+    
+}
+
+
+void pdp_resample_scale_bilin(s16 *src_image, s16 *dst_image, s32 src_w, s32 src_h, s32 dst_w, s32 dst_h)
+{
+    s32 i,j;
+    s32 virt_x=0;
+    s32 virt_y=0; /* virtual coordinates in 30 bit */
+    s32 scale_x = 0x40000000 / dst_w;
+    s32 scale_y = 0x40000000 / dst_h;
+
+    for (j=0; j<dst_h; j++){
+	for (i=0; i<dst_w; i++){
+	    *dst_image++ = pdp_resample_bilin(src_image, src_w, src_h, virt_x>>14, virt_y>>14);
+	    virt_x += scale_x;
+	}
+	virt_x = 0;
+	virt_y += scale_y;
+    }
+
+}
+
+void pdp_resample_scale_nn(s16 *src_image, s16 *dst_image, s32 src_w, s32 src_h, s32 dst_w, s32 dst_h)
+{
+    s32 i,j;
+    s32 x=0;
+    s32 y=0;
+    s32 frac_x=0;
+    s32 frac_y=0;
+    s32 scale_x = (src_w << 20 ) / dst_w;
+    s32 scale_y = (src_h << 20 ) / dst_h;
+
+    for (j=0; j<dst_h; j++){
+	for (i=0; i<dst_w; i++){
+	    *dst_image++ = src_image[x+y];
+	    frac_x += scale_x;
+	    x = frac_x >> 20;
+	}
+	x = 0;
+	frac_x = 0;
+	frac_y += scale_y;
+	y = (frac_y >> 20) * src_w;
+    }
+
+}
+
+/* USE pdp_resample_affinemap
+void pdp_resample_zoom_tiled_bilin(s16 *src_image, s16 *dst_image, s32 w, s32 h, 
+				   float zoom_x, float zoom_y, float center_x_relative, float center_y_relative)
+{
+    float izx = 1.0f / zoom_x;
+    float izy = 1.0f / zoom_y;
+    s32 scale_x = (s32)((float)0x100000 * izx / (float)w);
+    s32 scale_y = (s32)((float)0x100000 * izy / (float)h);
+
+    s32 top_virt_x = (s32)((1.0f - izx) * (float)0x100000 * center_x_relative);
+    s32 top_virt_y = (s32)((1.0f - izy) * (float)0x100000 * center_y_relative);
+
+    s32 virt_x = top_virt_x;
+    s32 virt_y = top_virt_y; 
+
+    s32 i,j;
+
+    for (j=0; j<h; j++){
+	for (i=0; i<w; i++){
+	    *dst_image++ = pdp_resample_bilin(src_image, w, h, virt_x>>4, virt_y>>4);
+	    virt_x += scale_x;
+	}
+	virt_x = top_virt_x;
+	virt_y += scale_y;
+    }
+
+}
+*/
+
+void pdp_resample_halve(s16 *src_image, s16 *dst_image, s32 src_w, s32 src_h)
+{
+
+    int dst_x,dst_y;
+    int src_x = 0;
+    int src_y = 0;
+    int dst_w = src_w >> 1;
+    int dst_h = src_h >> 1;
+    s32 tmp1,tmp2,tmp3,tmp4;
+
+    //post("%x %x %d %d\n", src_image, dst_image, src_w, src_h);
+
+    for(dst_y = 0; dst_y < dst_h * dst_w; dst_y += dst_w){
+	for (dst_x = 0; dst_x < dst_w; dst_x++){
+
+	    tmp1 = (s32)src_image[src_y + src_x];
+	    tmp2 = (s32)src_image[src_y + src_x + 1];
+	    tmp3 = (s32)src_image[src_y + src_x + src_w];
+	    tmp4 = (s32)src_image[src_y + src_x + src_w + 1];
+
+	    tmp1 += tmp2;
+	    tmp3 += tmp4;
+
+	    src_x += 2;
+
+	    dst_image[dst_x+dst_y] = (s16)((tmp1 + tmp3)>>2);
+	}
+	src_y += src_w << 1;
+	src_x = 0;
+    }
+}
+
+void pdp_resample_double(s16 *src_image, s16 *dst_image, s32 src_w, s32 src_h)
+{
+    int src_x = 0;
+    int src_y = 0;
+    int dst = 0;
+    int dst_w = src_w << 1;
+
+    s16 tmp;
+
+    for(src_y = 0; src_y < src_h * src_w; src_y += src_w){
+	for (src_x = 0; src_x < src_w; src_x++){
+
+	    tmp = *src_image++;
+      	    dst = (src_y << 2) + (src_x << 1);
+	    dst_image[dst]   = tmp;
+	    dst_image[dst+1] = tmp;
+	    dst+=dst_w;
+	    dst_image[dst]   = tmp;
+	    dst_image[dst+1] = tmp;
+	}
+    }
+}
+
+/* $$$TODO: finish this */
+void pdp_resample_padcrop(s16 *src_image, s16 *dst_image, s32 src_w, s32 src_h, s32 dst_w, s32 dst_h)
+{
+
+    int shift_x = (dst_w - src_w) / 2;
+    int shift_y = (dst_h - src_h) / 2;
+}
+
diff --git a/system/kernel/Makefile b/system/kernel/Makefile
new file mode 100644
index 0000000..f1d82a9
--- /dev/null
+++ b/system/kernel/Makefile
@@ -0,0 +1,16 @@
+
+OBJECTS = pdp.o pdp_ut.o pdp_packet.o pdp_queue.o pdp_comm.o \
+	pdp_control.o pdp_compat.o pdp_type.o pdp_dpd_command.o \
+	pdp_list.o pdp_forth.o
+
+
+include ../../Makefile.config
+
+all: pdp_main_clean $(OBJECTS)
+
+pdp_main_clean:
+	rm -f pdp.o
+
+clean:
+	rm -f *~
+	rm -f *.o
diff --git a/system/kernel/pdp.c b/system/kernel/pdp.c
new file mode 100644
index 0000000..d71e655
--- /dev/null
+++ b/system/kernel/pdp.c
@@ -0,0 +1,198 @@
+/*
+ *   Pure Data Packet system implementation: setup code
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include "pdp_config.h"
+#include "pdp.h"
+#include <stdio.h>
+
+/* all symbols are C style */
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/* module setup declarations (all C-style) */
+
+/* pdp system / internal stuff */
+void pdp_list_setup(void);
+void pdp_sym_setup(void);
+void pdp_forth_setup(void);
+void pdp_type_setup(void);
+void pdp_packet_setup(void);
+void pdp_ut_setup(void);
+void pdp_queue_setup(void);
+void pdp_control_setup(void);
+void pdp_image_setup(void);
+void pdp_bitmap_setup(void);
+void pdp_matrix_setup(void);
+
+
+/* pdp modules */
+void pdp_xv_setup(void);
+void pdp_add_setup(void);
+void pdp_mul_setup(void);
+void pdp_mix_setup(void);
+void pdp_randmix_setup(void);
+void pdp_qt_setup(void);
+void pdp_v4l_setup(void);
+void pdp_reg_setup(void);
+void pdp_conv_setup(void);
+void pdp_bq_setup(void);
+void pdp_del_setup(void);
+void pdp_snap_setup(void);
+void pdp_trigger_setup(void);
+void pdp_route_setup(void);
+void pdp_noise_setup(void);
+void pdp_gain_setup(void);
+void pdp_chrot_setup(void);
+void pdp_scope_setup(void);
+void pdp_scale_setup(void);
+void pdp_zoom_setup(void);
+void pdp_scan_setup(void);
+void pdp_scanxy_setup(void);
+void pdp_sdl_setup(void);
+void pdp_cheby_setup(void);
+void pdp_grey2mask_setup(void);
+void pdp_constant_setup(void);
+void pdp_logic_setup(void);
+void pdp_glx_setup(void);
+void pdp_loop_setup(void);
+void pdp_description_setup(void);
+void pdp_convert_setup(void);
+void pdp_stateless_setup(void);
+void pdp_mat_mul_setup(void);
+void pdp_mat_lu_setup(void);
+void pdp_mat_vec_setup(void);
+void pdp_plasma_setup(void);
+void pdp_cog_setup(void);
+void pdp_histo_setup(void);
+void pdp_array_setup(void);
+
+/* hacks */
+void pdp_inspect_setup(void);
+void pdp_slice_cut_setup(void);
+void pdp_slice_glue_setup(void);
+
+/* testing */
+void pdp_dpd_test_setup(void);
+void pdp_forthproc_setup(void);
+
+
+
+/* library setup routine */
+void pdp_setup(void){
+    
+    /* babble */
+    post ("PDP: pure data packet");
+
+#ifdef PDP_VERSION	
+    fprintf(stderr, "PDP: version " PDP_VERSION "\n");
+#endif
+
+
+    /* setup pdp system */
+    pdp_list_setup();
+    pdp_type_setup();
+    pdp_sym_setup();
+    pdp_packet_setup();
+    pdp_forth_setup();
+    pdp_control_setup();
+
+    pdp_image_setup();
+    pdp_bitmap_setup();
+    pdp_matrix_setup();
+
+    pdp_queue_setup();
+
+    /* setup utility toolkit */
+    pdp_ut_setup();
+
+    /* setup pdp modules*/
+    pdp_add_setup();
+    pdp_mul_setup();
+    pdp_mix_setup();
+    pdp_randmix_setup();
+    pdp_reg_setup();
+    pdp_conv_setup();
+    pdp_bq_setup();
+    pdp_del_setup();
+    pdp_snap_setup();
+    pdp_trigger_setup();
+    pdp_route_setup();
+    pdp_noise_setup();
+    pdp_plasma_setup();
+    pdp_gain_setup();
+    pdp_chrot_setup();
+    pdp_scope_setup();
+    pdp_scale_setup();
+    pdp_zoom_setup();
+    pdp_scan_setup();
+    pdp_scanxy_setup();
+    pdp_cheby_setup();
+    pdp_grey2mask_setup();
+    pdp_constant_setup();
+    pdp_logic_setup();
+    pdp_loop_setup();
+    pdp_description_setup();
+    pdp_convert_setup();
+    pdp_stateless_setup();
+    pdp_mat_mul_setup();
+    pdp_mat_lu_setup();
+    pdp_mat_vec_setup();
+    pdp_cog_setup();
+    pdp_histo_setup();
+    pdp_array_setup();
+
+    /* experimental stuff */
+    pdp_slice_cut_setup();
+    pdp_slice_glue_setup();
+    pdp_inspect_setup();
+
+    /* testing */
+    //pdp_dpd_test_setup();
+    pdp_forthproc_setup();
+
+    /* optional modules */
+
+#ifdef HAVE_PDP_QT
+    pdp_qt_setup();
+#endif
+
+#ifdef HAVE_PDP_XV
+    pdp_xv_setup();
+#endif
+
+#ifdef HAVE_PDP_SDL
+    pdp_sdl_setup();
+#endif
+
+#ifdef HAVE_PDP_V4L
+    pdp_v4l_setup();
+#endif
+
+#ifdef HAVE_PDP_GLX
+    pdp_glx_setup();
+#endif
+
+}
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/system/kernel/pdp_comm.c b/system/kernel/pdp_comm.c
new file mode 100644
index 0000000..bcc0e3a
--- /dev/null
+++ b/system/kernel/pdp_comm.c
@@ -0,0 +1,198 @@
+/*
+ *   Pure Data Packet system implementation.
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+/* this file contains misc communication (packet) methods for pd */
+
+
+#include "pdp.h"
+#include "pdp_internals.h"
+#include <stdio.h>
+
+/* all symbols are C style */
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+t_symbol *_pdp_sym_pdp;
+t_symbol *_pdp_sym_rro;
+t_symbol *_pdp_sym_rrw;
+t_symbol *_pdp_sym_prc;
+t_symbol *_pdp_sym_dpd;
+t_symbol *_pdp_sym_ins;
+t_symbol *_pdp_sym_acc;
+
+t_symbol *pdp_sym_pdp() {return _pdp_sym_pdp;}
+t_symbol *pdp_sym_rro() {return _pdp_sym_rro;}
+t_symbol *pdp_sym_rrw() {return _pdp_sym_rrw;}
+t_symbol *pdp_sym_prc() {return _pdp_sym_prc;}
+t_symbol *pdp_sym_dpd() {return _pdp_sym_dpd;}
+t_symbol *pdp_sym_ins() {return _pdp_sym_ins;}
+t_symbol *pdp_sym_acc() {return _pdp_sym_acc;}
+
+/************** packet management and communication convenience functions ************/
+
+/* send a packet to an outlet */
+void outlet_pdp(t_outlet *out, int packetid)
+{
+    t_atom atom[2];
+
+    SETFLOAT(atom+1, (float)packetid);
+
+    SETSYMBOL(atom+0, pdp_sym_rro());
+    outlet_anything(out, pdp_sym_pdp(), 2, atom);
+
+    SETSYMBOL(atom+0, pdp_sym_rrw());
+    outlet_anything(out, pdp_sym_pdp(), 2, atom);
+
+    SETSYMBOL(atom+0, pdp_sym_prc());
+    outlet_anything(out, pdp_sym_pdp(), 2, atom);
+
+}
+
+/* send an accumulation packet to an outlet */
+void outlet_dpd(t_outlet *out, int packetid)
+{
+    t_atom atom[2];
+
+    SETFLOAT(atom+1, (float)packetid);
+
+    SETSYMBOL(atom+0, pdp_sym_ins());
+    outlet_anything(out, pdp_sym_dpd(), 2, atom);
+
+    SETSYMBOL(atom+0, pdp_sym_acc());
+    outlet_anything(out, pdp_sym_dpd(), 2, atom);
+
+}
+
+/* unregister a packet and send it to an outlet */
+void
+
+pdp_packet_pass_if_valid(t_outlet *outlet, int *packet_ptr)
+{
+    t_pdp *header = pdp_packet_header(*packet_ptr);
+    //if (-1 != *packet){
+    if (header){
+	/* if packet is exclusively owned, mark as passing */
+	if (1 == header->users)  pdp_packet_mark_passing(packet_ptr);
+
+	/* send */
+	outlet_pdp(outlet, *packet_ptr);
+
+	/* if the packet is still here (was passing and not registered, 
+	   or it was a shared copy): unregister it */
+	if (-1 != *packet_ptr){
+	    pdp_packet_unmark_passing(*packet_ptr);
+	    pdp_packet_mark_unused(*packet_ptr);
+	    *packet_ptr = -1;
+	}
+    }
+}
+
+void
+pdp_packet_replace_if_valid(int *dpacket, int *spacket)
+{
+    if (-1 != *spacket){
+	pdp_packet_mark_unused(*dpacket);
+	*dpacket = *spacket;
+	*spacket = -1;
+    }
+    
+}
+
+
+int
+pdp_packet_copy_ro_or_drop(int *dpacket, int spacket)
+{
+    int drop = 0;
+    if (*dpacket == -1) *dpacket = pdp_packet_copy_ro(spacket);
+    else {
+	/* send a notification there is a dropped packet */
+	pdp_control_notify_drop(spacket);
+	drop = 1;
+    }
+    return drop;
+}
+
+
+int
+pdp_packet_copy_rw_or_drop(int *dpacket, int spacket)
+{
+    int drop = 0;
+    if (*dpacket == -1) *dpacket = pdp_packet_copy_rw(spacket);
+    else {
+	/* send a notification there is a dropped packet */
+	pdp_control_notify_drop(spacket);
+	drop = 1;
+    }
+    return drop;
+}
+
+int
+pdp_packet_convert_ro_or_drop(int *dpacket, int spacket, t_pdp_symbol *template)
+{
+    int drop = 0;
+
+    if (!template) return pdp_packet_copy_ro_or_drop(dpacket, spacket);
+
+    if (*dpacket == -1) *dpacket = pdp_packet_convert_ro(spacket, template);
+    else {
+	/* send a notification there is a dropped packet */
+	pdp_control_notify_drop(spacket);
+	drop = 1;
+    }
+    return drop;
+}
+
+
+int
+pdp_packet_convert_rw_or_drop(int *dpacket, int spacket, t_pdp_symbol *template)
+{
+    int drop = 0;
+
+    if (!template) return pdp_packet_copy_rw_or_drop(dpacket, spacket);
+
+    if (*dpacket == -1) *dpacket = pdp_packet_convert_rw(spacket, template);
+    else {
+	/* send a notification there is a dropped packet */
+	pdp_control_notify_drop(spacket);
+	drop = 1;
+    }
+    return drop;
+}
+
+
+void
+pdp_sym_setup(void)
+{
+    _pdp_sym_pdp = gensym("pdp");
+    _pdp_sym_rro = gensym("register_ro");
+    _pdp_sym_rrw = gensym("register_rw");
+    _pdp_sym_prc = gensym("process");
+    _pdp_sym_dpd = gensym("dpd");
+    _pdp_sym_ins = gensym("inspect");
+    _pdp_sym_acc = gensym("accumulate");
+}
+
+
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/system/kernel/pdp_compat.c b/system/kernel/pdp_compat.c
new file mode 100644
index 0000000..4bcf00d
--- /dev/null
+++ b/system/kernel/pdp_compat.c
@@ -0,0 +1,56 @@
+/*
+ *   Pure Data Packet system implementation. Compatibility routines.
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+/* this file contains misc communication methods */
+
+
+#include "pdp.h"
+#include "pdp_internals.h"
+#include <stdio.h>
+
+/* all symbols are C style */
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+
+
+void
+pdp_pass_if_valid(t_outlet *outlet, int *packet)
+{
+    pdp_packet_pass_if_valid(outlet, packet);
+}
+
+void
+pdp_replace_if_valid(int *dpacket, int *spacket)
+{
+    pdp_packet_replace_if_valid(dpacket, spacket);
+    
+}
+
+
+
+
+
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/system/kernel/pdp_control.c b/system/kernel/pdp_control.c
new file mode 100644
index 0000000..2cba7b7
--- /dev/null
+++ b/system/kernel/pdp_control.c
@@ -0,0 +1,186 @@
+/*
+ *   Pure Data Packet system implementation: control object
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+
+/* this is an actual pd class that is used for communication with the
+   pdp framework */
+
+#include "pdp.h"
+#include "pdp_internals.h"
+#include "pdp_control.h"
+#include <stdio.h>
+
+/* all symbols are C style */
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+
+
+static long dropped_packets;
+
+static t_class* pdp_control_class;
+
+
+/* pdp control instance data */
+
+struct _pdp_control;
+typedef struct _pdp_control
+{
+    t_object x_obj;
+    t_outlet *x_outlet0;
+    struct _pdp_control *x_next;
+
+} t_pdp_control;
+
+
+
+static t_pdp_control *pdp_control_list;
+
+static void pdp_control_info(t_pdp_control *x)
+{
+}
+
+static void pdp_control_collectgarbage(t_pdp_control *x)
+{
+    int nb_packets_freed =  pdp_pool_collect_garbage();
+    post("pdp_control: freed %d packets", nb_packets_freed);
+    
+}
+
+static void pdp_control_set_mem_limit(t_pdp_control *x, t_floatarg f)
+{
+    int limit = (int)f;
+    if (limit < 0) limit = 0;
+    pdp_pool_set_max_mem_usage(limit);
+    if (limit) post("pdp_control: set memory limit to %d bytes", limit);
+    else post("pdp_control: disabled memory limit");
+    
+}
+
+static void pdp_control_thread(t_pdp_control *x, t_floatarg f)
+{
+    int t = (int)f;
+
+    if (t){
+	post("pdp_control: pdp is now using its own processing thread");
+	pdp_queue_use_thread(1);
+    }
+    else {
+	post("pdp_control: pdp is now using the main pd thread");
+	pdp_queue_use_thread(0);
+    }
+}
+
+
+static void pdp_control_send_drop_message(t_pdp_control *x)
+{
+    t_atom atom[1];
+    t_symbol *s = gensym("pdp_drop");
+
+    SETFLOAT(atom+0, (float)dropped_packets);
+    outlet_anything(x->x_outlet0, s, 1, atom);
+}
+
+
+static void pdp_control_free(t_pdp_control *x)
+{
+    /* remove from linked list */
+    t_pdp_control *curr = pdp_control_list;
+    if (pdp_control_list == x) pdp_control_list = x->x_next;
+    else while (curr){
+	if (curr->x_next == x) {
+	    curr->x_next = x->x_next;
+	    break;
+	}
+	else {
+	    curr = curr->x_next;
+	}
+	
+    }
+}
+
+
+static void *pdp_control_new(void)
+{
+    t_pdp_control *x = (t_pdp_control *)pd_new(pdp_control_class);
+    x->x_outlet0 = outlet_new(&x->x_obj, &s_anything);
+
+    /* add to list */
+    x->x_next = pdp_control_list;
+    pdp_control_list = x;
+    return x;
+}
+
+/************************* class methods ***************************************/
+
+
+void pdp_control_addmethod(t_method m, t_symbol *s)
+{
+    class_addmethod(pdp_control_class, m, s, A_GIMME, A_NULL);
+}
+
+void pdp_control_setup(void)
+{
+
+    pdp_control_list = 0;
+    dropped_packets = 0;
+
+    /* setup pd class data */
+    pdp_control_class = class_new(gensym("pdp_control"), (t_newmethod)pdp_control_new,
+    	(t_method)pdp_control_free, sizeof(t_pdp_control), 0, A_NULL);
+
+
+    class_addmethod(pdp_control_class, (t_method)pdp_control_info, gensym("info"), A_NULL);   
+    class_addmethod(pdp_control_class, (t_method)pdp_control_thread, gensym("thread"),  A_DEFFLOAT, A_NULL);   
+    class_addmethod(pdp_control_class, (t_method)pdp_control_collectgarbage, gensym("collectgarbage"),  A_NULL);   
+    class_addmethod(pdp_control_class, (t_method)pdp_control_set_mem_limit, gensym("memlimit"),  A_FLOAT, A_NULL);   
+}
+
+
+
+void pdp_control_notify_broadcast(t_pdp_control_method_notify *notify)
+{
+    t_pdp_control *curr = pdp_control_list;
+    while (curr){
+	(*notify)(curr);
+	curr = curr->x_next;
+    }
+}
+
+
+
+/************************* notify class methods  *************************/
+
+void pdp_control_notify_drop(int packet)
+{
+    dropped_packets++;
+
+    /* send drop notify to controller class instances */
+    pdp_control_notify_broadcast(pdp_control_send_drop_message);
+    //post("dropped packet");
+}
+
+
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/system/kernel/pdp_dpd_command.c b/system/kernel/pdp_dpd_command.c
new file mode 100644
index 0000000..0d3ecf1
--- /dev/null
+++ b/system/kernel/pdp_dpd_command.c
@@ -0,0 +1,87 @@
+
+/*
+ *   Pure Data Packet header file. DPD command class
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+/* this object implements a dpd command queue and command object */
+
+#include "pdp.h"
+#include "pdp_dpd_command.h"
+
+void pdp_dpd_commandfactory_init(t_pdp_dpd_commandfactory *x, u32 size)
+{
+    x->nb_commands = 0;
+    x->command_size = size;
+    x->command = 0;
+}
+
+void _pdp_dpd_commandfactory_free(t_pdp_dpd_command *x)
+{
+    if (x) _pdp_dpd_commandfactory_free(x->next);
+    pdp_dealloc(x);
+}
+
+void pdp_dpd_commandfactory_free(t_pdp_dpd_commandfactory *x)
+{
+    _pdp_dpd_commandfactory_free(x->command);
+    x->command = 0;
+    x->nb_commands = 0;
+}
+
+
+/* factory method */
+t_pdp_dpd_command *pdp_dpd_commandfactory_get_new_command(t_pdp_dpd_commandfactory *x)
+{
+
+    t_pdp_dpd_command *c = x->command;
+    t_pdp_dpd_command *oldhead = c;
+
+    /* check if we can reuse */
+    while (c){
+	if (!c->used){
+	    c->used = 1;
+	    //post("reusing command %x", c, c->used);
+	    return c;
+	}
+	//post("command %x is used %d", c, c->used);
+	c = c->next;
+    }
+
+    /* create a new command */
+    x->command = (t_pdp_dpd_command *)pdp_alloc(x->command_size);
+    x->command->next = oldhead;
+    x->command->used = 1;
+    x->nb_commands++;
+    //post("created command %x, nbcommands: %d", x->command, x->nb_commands);
+    return x->command;
+
+}
+
+
+/* (self)destructor */
+void pdp_dpd_command_suicide(void *x)
+{
+    t_pdp_dpd_command *c = (t_pdp_dpd_command *)x;
+    c->used = 0;
+    //post("command %x committed suicide %d", c, c->used);
+}
+
+
+
+
diff --git a/system/kernel/pdp_forth.c b/system/kernel/pdp_forth.c
new file mode 100644
index 0000000..1764004
--- /dev/null
+++ b/system/kernel/pdp_forth.c
@@ -0,0 +1,541 @@
+/*
+ *   Pure Data Packet header file. Packet processor system
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <stdlib.h>
+#include <math.h>
+#include "pdp.h"
+#include "pdp_forth.h"
+
+#define D if (0)
+
+
+
+t_pdp_stack *pdp_stack_new(void) {return pdp_list_new(0);}
+
+void pdp_stack_free(t_pdp_stack *s) {
+    pdp_tree_strip_packets(s);
+    pdp_list_free(s);
+}
+
+
+/* some stack manips */
+t_pdp_word_error pdp_stack_dup(t_pdp_stack *s)
+{
+    if (!s->first) return e_underflow;
+    pdp_list_add(s, s->first->t, s->first->w);
+
+    /* copy it properly if its a packet */
+    if (s->first->t == a_packet){
+	s->first->w.w_packet = pdp_packet_copy_ro(s->first->w.w_packet);
+    }
+    return e_ok;
+}
+
+t_pdp_word_error pdp_stack_drop(t_pdp_stack *s)
+{
+    if (!s->first) return e_underflow;
+
+    /* delete it properly if its a packet */
+    if (s->first->t == a_packet){
+	pdp_packet_mark_unused(s->first->w.w_packet);
+    }
+    pdp_list_pop(s);
+
+    return e_ok;
+}
+
+t_pdp_word_error pdp_stack_over(t_pdp_stack *s)
+{
+    if (s->elements < 2) return e_underflow;
+    pdp_list_add(s, s->first->next->t, s->first->next->w);
+
+    /* copy it properly if its a packet */
+    if (s->first->t == a_packet){
+	s->first->w.w_packet = pdp_packet_copy_ro(s->first->w.w_packet);
+    }
+    
+    return e_ok;
+}
+
+t_pdp_word_error pdp_stack_swap(t_pdp_stack *s)
+{
+    t_pdp_word w;
+    t_pdp_word_type t;
+    if (s->elements < 2) return e_underflow;
+    w = s->first->w;
+    t = s->first->t;
+    s->first->w = s->first->next->w;
+    s->first->t = s->first->next->t;
+    s->first->next->w = w;
+    s->first->next->t = t;
+    return e_ok;
+    
+}
+
+/* pushing and popping the stack */
+
+t_pdp_word_error pdp_stack_push_float(t_pdp_stack *s,  float f)         {pdp_list_add(s, a_float,   (t_pdp_word)f); return e_ok;}
+t_pdp_word_error pdp_stack_push_int(t_pdp_stack *s,    int i)           {pdp_list_add(s, a_int,     (t_pdp_word)i); return e_ok;}
+t_pdp_word_error pdp_stack_push_pointer(t_pdp_stack *s,    void *x)     {pdp_list_add(s, a_pointer, (t_pdp_word)x); return e_ok;}
+t_pdp_word_error pdp_stack_push_symbol(t_pdp_stack *s, t_pdp_symbol *x) {pdp_list_add(s, a_symbol,  (t_pdp_word)x); return e_ok;}
+
+/* note: packets pushed stack are owned by the stack. if a caller wants to keep a packet that
+   will be deleted by the word, it should make a copy before transferring it to the stack.
+   if a stack processor wants to write to a packet, it should replace it with a writable copy first */
+
+t_pdp_word_error pdp_stack_push_packet(t_pdp_stack *s, int p)           {pdp_list_add(s, a_packet, (t_pdp_word)p); return e_ok;}
+
+
+
+
+
+t_pdp_word_error pdp_stack_pop_float(t_pdp_stack *s, float *f)
+{
+    if (!s->first) return e_underflow;
+
+    if (s->first->t == a_float) *f = s->first->w.w_float; 
+    else if (s->first->t == a_int) *f = (float)s->first->w.w_int; 
+    else *f = 0.0f;
+    pdp_stack_drop(s);
+    return e_ok;
+}
+
+t_pdp_word_error pdp_stack_pop_int(t_pdp_stack *s, int *i)
+{
+    if (!s->first) return e_underflow;
+    if (s->first->t == a_int) *i = s->first->w.w_int; 
+    else if (s->first->t == a_float) *i = (int)s->first->w.w_float; 
+    else *i = 0;
+    pdp_stack_drop(s);
+    return e_ok;
+}
+
+t_pdp_word_error pdp_stack_pop_pointer(t_pdp_stack *s, void **x)
+{
+    if (!s->first) return e_underflow;
+    *x = (s->first->t == a_pointer) ? s->first->w.w_pointer : 0; 
+    pdp_stack_drop(s);
+    return e_ok;
+}
+
+t_pdp_word_error pdp_stack_pop_symbol(t_pdp_stack *s, t_pdp_symbol **x)
+{
+    if (!s->first) return e_underflow;
+    *x = (s->first->t == a_symbol) ? s->first->w.w_symbol : pdp_gensym("invalid"); 
+    pdp_stack_drop(s);
+    return e_ok;
+}
+
+/* packets popped from the stack are owned by the caller */
+
+t_pdp_word_error pdp_stack_pop_packet(t_pdp_stack *s, int *p)
+{
+    if (!s->first) return e_underflow;
+    *p = (s->first->t == a_packet) ? s->first->w.w_packet : -1; 
+    pdp_list_pop(s); //ownership is transferred to receiver, drop kills the packet
+    return e_ok;
+}
+
+
+t_pdp_word_error pdp_stack_mov(t_pdp_stack *s)
+{
+    int position;
+    t_pdp_atom *a, *a_before;
+    if (s->elements < 2) return e_underflow;
+    if (s->first->t != a_int) return e_type;
+
+    pdp_stack_pop_int(s, &position); // get insert point
+    if (position < 1) return e_ok; // < 0 : invalid; do nothing, 0 : nop (= insert at start, but already at start)
+    if ((s->elements-1) < position) return e_underflow;
+
+    a = s->first; // get first atom
+    s->first = a->next;
+
+    if (s->elements-1 == position){ //insert at end
+	s->last->next = a;
+	a->next = 0;
+	s->last = a;
+    }
+    else { //insert somewhere in the middle
+	a_before = s->first;
+	while (--position) a_before = a_before->next;
+	a->next = a_before->next;
+	a_before->next = a;
+    }
+    return e_ok;
+}
+
+/* rotate stack down (tos -> bottom) */
+t_pdp_word_error pdp_stack_rdown(t_pdp_stack *s)
+{
+    t_pdp_word_type t = s->first->t;
+    t_pdp_word w = s->first->w;
+    pdp_list_pop(s);
+    pdp_list_add_back(s, t, w);
+    return e_ok;
+}
+
+
+/* convert to int */
+t_pdp_word_error pdp_stack_int(t_pdp_stack *s)
+{
+    int i;
+    pdp_stack_pop_int(s, &i);
+    pdp_stack_push_int(s, i);
+    return e_ok;
+}
+
+/* convert to float */
+t_pdp_word_error pdp_stack_float(t_pdp_stack *s)
+{
+    float f;
+    pdp_stack_pop_float(s, &f);
+    pdp_stack_push_float(s, f);
+    return e_ok;
+}
+
+
+#define OP1(name, type, op)					\
+t_pdp_word_error pdp_stack_##name##_##type (t_pdp_stack *s)	\
+{								\
+    type x0;							\
+    pdp_stack_pop_##type (s, &(x0));				\
+    pdp_stack_push_##type (s, op (x0));				\
+    return e_ok;						\
+}
+
+#define OP2(name, type, op)					\
+t_pdp_word_error pdp_stack_##name##_##type (t_pdp_stack *s)	\
+{								\
+    type x0, x1;						\
+    pdp_stack_pop_##type (s, &(x0));				\
+    pdp_stack_pop_##type (s, &(x1));				\
+    pdp_stack_push_##type (s, x1 op x0);			\
+    return e_ok;						\
+}
+
+/* some floating point and integer stuff */
+
+OP2(add, float, +);
+OP2(sub, float, -);
+OP2(mul, float, *);
+OP2(div, float, /);
+
+OP1(sin, float, sin);
+OP1(cos, float, cos);
+
+OP2(add, int, +);
+OP2(sub, int, -);
+OP2(mul, int, *);
+OP2(div, int, /);
+OP2(mod, int, %);
+
+OP2(and, int, &);
+OP2(or, int, |);
+OP2(xor, int, ^);
+
+
+/* some integer stuff */
+
+t_pdp_word_error pdp_stack_push_invalid_packet(t_pdp_stack *s)
+{
+    pdp_stack_push_packet(s, -1);
+    return e_ok;
+}
+
+/* dictionary manipulation */
+
+void pdp_forth_word_print_debug(t_pdp_symbol *s)
+{
+    t_pdp_atom *a;
+    if (!s->s_word_spec){
+	post("%s is not a forth word", s->s_name);
+    }
+    else{
+	post("");
+	post("forth word %s", s->s_name);
+	post("\tinput: %d", s->s_word_spec->input_size);
+	post("\toutput: %d", s->s_word_spec->output_size);
+	post("\ttype index: %d", s->s_word_spec->type_index);
+
+	post("\nimplementations:");
+	for(a=s->s_word_spec->implementations->first; a; a=a->next){
+	    t_pdp_forthword_imp *i = a->w.w_pointer;
+	    startpost("\t%s\t", i->type ? i->type->s_name : "anything");
+	    pdp_list_print(i->def);
+	    
+	}
+	post("");
+    }
+}
+
+/* add a definition (list of high level words (symbols) or primitive routines) */
+void pdp_forthdict_add_word(t_pdp_symbol *name, t_pdp_list *def, int input_size, int output_size,
+			    int type_index, t_pdp_symbol *type)
+{
+    t_pdp_forthword_spec *spec = 0;
+    t_pdp_forthword_imp *imp = 0;
+    t_pdp_forthword_imp *old_imp = 0;
+    t_pdp_atom *a;
+    /* check if the word complies to a previously defined word spec with the same name */
+    if (spec = name->s_word_spec){
+	if ((spec->input_size != input_size)
+	    ||(spec->output_size != output_size)
+	    ||(spec->type_index != type_index)){
+	    post("ERROR: pdp_forthdict_add_word: new implementation of [%s] does not comply to old spec",
+		 name->s_name);
+	    return;
+	}
+
+    }
+    /* no previous word spec with this name, so create a new spec */
+    else{
+	spec = name->s_word_spec = (t_pdp_forthword_spec *)pdp_alloc(sizeof(t_pdp_forthword_spec));
+	spec->name = name;
+	spec->input_size = input_size;
+	spec->output_size = output_size;
+	spec->type_index = type_index;
+	spec->implementations = pdp_list_new(0);
+    }
+	
+    /* create the new implementation and add it */
+    imp = (t_pdp_forthword_imp *)pdp_alloc(sizeof(t_pdp_forthword_imp));
+    imp->name = name;
+    imp->def = def;
+    imp->type = type;
+
+    /* can't delete old implemetations because of thread safety */
+    pdp_list_add_pointer(spec->implementations, imp);
+	
+}
+
+/* add a primitive */
+void pdp_forthdict_add_primitive(t_pdp_symbol *name, t_pdp_forthword w, int input_size, int output_size,
+				 int type_index, t_pdp_symbol *type)
+{
+    t_pdp_list *def = pdp_list_new(1);
+    def->first->t = a_pointer;
+    def->first->w.w_pointer = w;
+    pdp_forthdict_add_word(name, def, input_size, output_size, type_index, type);
+}
+
+/* parse a new definition from a null terminated string */
+t_pdp_list *pdp_forth_compile_def(char *chardef)
+{
+    t_pdp_list *l;
+    char *c;
+
+    if (!(l = pdp_list_from_cstring(chardef, &c))){
+	post ("ERROR: pdp_forth_compile_def: parse error parsing: %s", chardef);
+	if (*c) post ("ERROR: remaining input: %s", c);
+    }
+    if (*c){
+	post ("WARNING: pdp_forth_compile_def: parsing: %s", chardef);
+	if (*c) post ("garbage at end of string: %s", c);
+    }
+
+    return l;
+
+}
+
+void pdp_forthdict_compile_word(t_pdp_symbol *name, char *chardef, int input_size, int output_size,
+				int type_index, t_pdp_symbol *type)
+{
+    /* add the definition list to the dictionary */
+    t_pdp_list *def;
+
+    if (def = pdp_forth_compile_def (chardef))
+	pdp_forthdict_add_word(name, def, input_size, output_size, type_index, type);
+    
+    
+}
+
+
+
+/* execute a definition list
+   a def list is a list of primitives, immediates or symbolic words */
+t_pdp_word_error pdp_forth_execute_def(t_pdp_stack *stack, t_pdp_list *def)
+{
+    t_pdp_atom *a;
+    t_pdp_word_error e;
+    t_pdp_forthword w;
+    float f;
+    int i,p;
+    
+    D post("pdp_forth_execute_def %x %x", stack, def);
+    D pdp_list_print(def);
+
+    for (a = def->first; a; a=a->next){
+	switch(a->t){
+	case a_float: // an immidiate float
+            f = a->w.w_float;
+	    D post("pushing %f onto the stack", f);
+	    pdp_stack_push_float(stack, f);
+	    break;
+	case a_int:  // an immidiate int
+            i = a->w.w_int;
+	    D post("pushing %d onto the stack", i);
+	    pdp_stack_push_int(stack, i);
+	    break;
+	case a_packet:  // an immidiate int
+            p = a->w.w_packet;
+	    D post("pushing packet %d onto the stack", p);
+	    pdp_stack_push_packet(stack, pdp_packet_copy_ro(p));
+	    break;
+	case a_symbol:  // a high level word or an immediate symbol
+	    D post("interpeting symbol %s", a->w.w_symbol->s_name);
+	    if (e = pdp_forth_execute_word(stack, a->w.w_symbol)) return e;
+	    break;
+	case a_pointer: // a primitive
+	    w = a->w.w_pointer;
+	    D post("exec primitive %x", w);
+	    if (e = (w(stack))) return e;
+	    break;
+	default:
+	    return e_internal;
+
+	}
+    }
+    return e_ok;
+}
+
+/* execute a symbol (a high level word or an immediate) 
+   this routine does the type based word multiplexing and stack checking */
+t_pdp_word_error pdp_forth_execute_word(t_pdp_stack *stack, t_pdp_symbol *word)
+{
+    t_pdp_symbol *type = 0;
+    t_pdp_atom *a;
+    t_pdp_forthword_spec *spec;
+    t_pdp_forthword_imp *imp = 0;
+    int i;
+
+    D post("pdp_forth_execute_word %x %x", stack, word);
+
+    /* first check if the word is defined. if not, the symbol will be loaded
+       onto the stack as an immidiate symbol */
+
+    if (!(spec = word->s_word_spec)){
+	D post ("pushing symbol %s on the stack", word->s_name);
+	pdp_stack_push_symbol(stack, word);
+	return e_ok;
+    }
+
+    D post("exec high level word [%s]", word->s_name);
+
+    /* it is a word. check the stack size */
+    if (stack->elements < spec->input_size){
+	D post ("error executing [%s]: stack underflow", word->s_name);
+	return e_underflow;
+    }
+
+    /* if the word is type oblivious, symply execute the first (only)
+       implementation in the list */
+    if (spec->type_index < 0){
+	D post("exec type oblivious word [%s]", word->s_name);
+	imp = spec->implementations->first->w.w_pointer;
+	return pdp_forth_execute_def(stack , imp->def);
+    }
+
+    /* if it is not type oblivious, find the type template
+       to determine the correct implementation */
+
+    for(i=spec->type_index,a=stack->first; i--; a=a->next);
+    switch (a->t){
+      /* get type description from first item on*/
+    case a_packet: 
+	type = pdp_packet_get_description(a->w.w_packet); break;
+    case a_symbol:
+	type = a->w.w_symbol; break;
+    case a_float:
+	type = pdp_gensym("float"); break;
+    case a_int:
+	type = pdp_gensym("int"); break;
+    case a_pointer:
+	type = pdp_gensym("pointer"); break;
+    default:
+      /* no type description found on top of stack. */
+        type = pdp_gensym("unknown");
+	break;
+    }
+
+    /* scan the implementation list until a definition with matching type is found
+       if the type spec for a word is NULL, it counts as a match (for generic words) */
+    for (a = spec->implementations->first; a; a = a->next){
+	imp = a->w.w_pointer;
+	if ((!imp->type) || pdp_type_description_match(type, imp->type)){
+	    return pdp_forth_execute_def(stack , imp->def);
+	}
+    }
+    D post("ERROR: pdp_forth_execute_word: type error executing [%s] (2). stack:",word->s_name);
+    D pdp_list_print(stack);
+
+    return e_type; // type error
+    
+}
+
+
+static void _add_2op(char *name, t_pdp_forthword w, char *type){
+    pdp_forthdict_add_primitive(pdp_gensym(name), w, 2, 1, 0, pdp_gensym(type));
+}
+
+static void _add_1op(char *name, t_pdp_forthword w, char *type){
+    pdp_forthdict_add_primitive(pdp_gensym(name), w, 1, 1, 0, pdp_gensym(type));
+}
+
+
+void pdp_forth_setup(void)
+{
+
+    /* add type oblivious (type_index = -1, type = NULL) stack manip primitives */
+    pdp_forthdict_add_primitive(pdp_gensym("dup"),    (t_pdp_forthword)pdp_stack_dup,    1, 2, -1, 0);
+    pdp_forthdict_add_primitive(pdp_gensym("swap"),   (t_pdp_forthword)pdp_stack_swap,   2, 2, -1, 0);
+    pdp_forthdict_add_primitive(pdp_gensym("drop"),   (t_pdp_forthword)pdp_stack_drop,   1, 0, -1, 0);
+    pdp_forthdict_add_primitive(pdp_gensym("over"),   (t_pdp_forthword)pdp_stack_over,   2, 3, -1, 0);
+    pdp_forthdict_add_primitive(pdp_gensym("mov"),    (t_pdp_forthword)pdp_stack_mov,    2, 1, -1, 0);
+    pdp_forthdict_add_primitive(pdp_gensym("down"),  (t_pdp_forthword)pdp_stack_rdown,  1, 1, -1, 0);
+
+    /* type converters (casts) */
+    pdp_forthdict_add_primitive(pdp_gensym("int"),  (t_pdp_forthword)pdp_stack_int,  1, 1, -1, 0);
+    pdp_forthdict_add_primitive(pdp_gensym("float"),  (t_pdp_forthword)pdp_stack_float,  1, 1, -1, 0);
+
+    /* add floating point ops */
+    _add_2op("add", (t_pdp_forthword)pdp_stack_add_float, "float");
+    _add_2op("sub", (t_pdp_forthword)pdp_stack_sub_float, "float");
+    _add_2op("mul", (t_pdp_forthword)pdp_stack_mul_float, "float");
+    _add_2op("div", (t_pdp_forthword)pdp_stack_div_float, "float");
+
+    _add_1op("sin", (t_pdp_forthword)pdp_stack_sin_float, "float");
+    _add_1op("cos", (t_pdp_forthword)pdp_stack_cos_float, "float");
+
+    /* add integer ops */
+    _add_2op("add", (t_pdp_forthword)pdp_stack_add_int, "int");
+    _add_2op("sub", (t_pdp_forthword)pdp_stack_sub_int, "int");
+    _add_2op("mul", (t_pdp_forthword)pdp_stack_mul_int, "int");
+    _add_2op("div", (t_pdp_forthword)pdp_stack_div_int, "int");
+    _add_2op("mod", (t_pdp_forthword)pdp_stack_mod_int, "int");
+
+    _add_2op("and", (t_pdp_forthword)pdp_stack_and_int, "int");
+    _add_2op("or", (t_pdp_forthword)pdp_stack_or_int, "int");
+    _add_2op("xor", (t_pdp_forthword)pdp_stack_xor_int, "int");
+
+    /* some immidiates */
+    pdp_forthdict_add_primitive(pdp_gensym("ip"),  (t_pdp_forthword)pdp_stack_push_invalid_packet,  0, 1, -1, 0);
+    
+}
diff --git a/system/kernel/pdp_list.c b/system/kernel/pdp_list.c
new file mode 100644
index 0000000..ed2ad76
--- /dev/null
+++ b/system/kernel/pdp_list.c
@@ -0,0 +1,663 @@
+
+/*
+ *   Pure Data Packet header file. List class
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+/* who can live without a list, hmm? */
+
+/* rethink the list of list thing:
+   should free and copy really copy the lists, or should
+   references to lists be allowed too?
+
+   maybe references to lists as generic pointers? */
+
+#include "pdp_list.h"
+#include "pdp_types.h"
+#include "pdp.h"
+#include <pthread.h>
+#include <stdlib.h>
+
+#define D if (0)
+
+#define PDP_LIST_BLOCKSIZE 4096
+
+#define PDP_ATOM_ALLOC _pdp_atom_reuse
+#define PDP_ATOM_DEALLOC _pdp_atom_save
+//#define PDP_ATOM_ALLOC _pdp_atom_alloc
+//#define PDP_ATOM_DEALLOC _pdp_atom_dealloc
+
+static t_pdp_atom *freelist;
+static t_pdp_list *blocklist;
+static pthread_mutex_t mut;
+
+/* memory allocation (for ease of wrapping) */
+static inline t_pdp_list* _pdp_list_alloc(void){return (t_pdp_list *)pdp_alloc(sizeof(t_pdp_list));}
+static inline void _pdp_list_dealloc(t_pdp_list *list){pdp_dealloc(list);}
+static inline t_pdp_atom* _pdp_atom_alloc(void){return (t_pdp_atom *)pdp_alloc(sizeof(t_pdp_atom));}
+static inline void _pdp_atom_dealloc(t_pdp_atom *a){pdp_dealloc(a);}
+
+
+
+/* some private helper methods */
+
+/* list pool setup */
+void pdp_list_setup(void)
+{
+    freelist = 0;
+    blocklist = _pdp_list_alloc();
+    blocklist->elements = 0;
+    blocklist->first = 0;
+    pthread_mutex_init(&mut, NULL);
+
+#if 0
+    {
+	char *c = "(test 1 2 (23 4)) (een (zes (ze)ven ()))) (())";
+	while (*c){
+	    t_pdp_list *l = pdp_list_from_char(c, &c);
+	    if (l) pdp_list_print(l); 
+	    else{
+		post("parse error: remaining input: %s", c); break;
+	    }
+	}
+    }
+#endif
+
+}
+
+/* allocate a block */
+static t_pdp_atom* _pdp_atom_block_alloc(int size)
+{
+    int i = size;
+    t_pdp_atom *atom_block, *atom;
+    atom_block = (t_pdp_atom *)pdp_alloc(sizeof(t_pdp_atom) * size);
+    atom = atom_block;
+    while(i--){
+        atom->next = atom + 1;
+        atom->t = a_undef;
+	atom->w.w_int = 0;
+        atom++;
+    }
+    atom_block[size-1].next = 0;
+    return atom_block;
+}
+
+static void _pdp_atomlist_fprint(FILE* f, t_pdp_atom *a);
+
+static void _pdp_atom_refill_freelist(void)
+{
+    t_pdp_atom *atom;
+
+    if (freelist != 0) post("ERROR:_pdp_atom_do_reuse: freelist != 0");
+
+    /* get a new block */
+    freelist = _pdp_atom_block_alloc(PDP_LIST_BLOCKSIZE);
+    //post("new block");
+    //_pdp_atomlist_fprint(stderr, freelist);
+
+    /* take the first element from the block to serve as a blocklist element */
+    atom = freelist;
+    atom->t = a_pointer;
+    atom->w.w_pointer = freelist;
+    freelist = freelist->next;
+    atom->next = blocklist->first;
+    blocklist->first = atom;
+    blocklist->elements++;
+    
+}
+
+
+/* reuse an old element from the freelist, or allocate a new block */
+static inline t_pdp_atom* _pdp_atom_reuse(void)
+{
+    t_pdp_atom *atom;
+
+    pthread_mutex_lock(&mut);
+
+    while (!(atom = freelist)){
+	_pdp_atom_refill_freelist();
+    }
+    /* delete the element from the freelist */
+    freelist = freelist->next;
+    atom->next = 0;
+
+    pthread_mutex_unlock(&mut);
+
+    return atom;
+}
+
+static inline void _pdp_atom_save(t_pdp_atom *atom)
+{
+    pthread_mutex_lock(&mut);
+
+    atom->next = freelist;
+    freelist = atom;
+
+    pthread_mutex_unlock(&mut);
+}
+
+
+
+
+
+
+/* create a list */
+t_pdp_list* pdp_list_new(int elements)
+{
+    t_pdp_atom *a = 0;
+    t_pdp_list *l = _pdp_list_alloc();
+    l->elements = 0;
+    if (elements){
+	a = PDP_ATOM_ALLOC();
+	l->elements++;
+	a->t = a_undef;
+	a->w.w_int = 0;
+	a->next = 0;
+	elements--;
+    }
+    l->first = a;
+    l->last = a;
+
+    while (elements--){
+	a = PDP_ATOM_ALLOC();
+	l->elements++;
+	a->t = a_undef;
+	a->w.w_int = 0;
+	a->next = l->first;
+	l->first = a;
+    }
+    return l;
+}
+
+/* clear a list */
+void pdp_list_clear(t_pdp_list *l)
+{
+    t_pdp_atom *a = l->first; 
+    t_pdp_atom *next_a;
+
+    while(a){
+	next_a = a->next;
+	PDP_ATOM_DEALLOC(a);
+	a = next_a;
+    }
+    l->first = 0;
+    l->last = 0;
+    l->elements = 0;
+}
+
+/* destroy a list */
+void pdp_list_free(t_pdp_list *l)
+{
+    if (l){
+	pdp_list_clear(l);
+	_pdp_list_dealloc(l);
+    }
+}
+
+
+/* destroy a (sub)tree */
+void pdp_tree_free(t_pdp_list *l)
+{
+  if (l) {
+    pdp_tree_clear(l);
+    _pdp_list_dealloc(l);
+  }
+}
+
+/* clear a tree */
+void pdp_tree_clear(t_pdp_list *l)
+{
+    t_pdp_atom *a = l->first; 
+    t_pdp_atom *next_a;
+
+    while(a){
+      if (a->t == a_list) pdp_tree_free(a->w.w_list);
+      next_a = a->next;
+      PDP_ATOM_DEALLOC(a);
+      a = next_a;
+    }
+    l->first = 0;
+    l->last = 0;
+    l->elements = 0;
+}
+
+
+static inline int _is_whitespace(char c){return (c == ' ' || c == '\n' || c == '\t');}
+static inline void _skip_whitespace(char **c){while (_is_whitespace(**c)) (*c)++;}
+static inline int _is_left_separator(char c) {return (c == '(');}
+static inline int _is_right_separator(char c) {return (c == ')');}
+static inline int _is_separator(char c) {return (_is_left_separator(c) || _is_right_separator(c) || _is_whitespace(c));}
+
+
+static inline void _parse_atom(t_pdp_word_type *t, t_pdp_word *w, char *c, int n)
+{
+    char tmp[n+1];
+    //post("_parse_atom(%d, %x, %s, %d)", *t, w, c, n); 
+    strncpy(tmp, c, n);
+    tmp[n] = 0;
+
+
+    /* check if it's a number */
+    if (tmp[0] >= '0' && tmp[0] <= '9'){
+	int is_float = 0;
+	char *t2;
+	for(t2 = tmp; *t2; t2++){
+	    if (*t2 == '.') {
+		is_float = 1;
+		break;
+	    }
+	}
+	/* it's a float */
+	if (is_float){
+	    float f = strtod(tmp, 0);
+	    D post("adding float %f", f);
+	    *t = a_float;
+	    *w = (t_pdp_word)f;
+	}
+
+	/* it's an int */
+	else {
+	    int i = strtol(tmp, 0, 0);
+	    D post("adding int %d", i);
+	    *t = a_int;
+	    *w = (t_pdp_word)i;
+	}
+	
+    }
+    /* it's a symbol */
+    else {
+	D post("adding symbol %s", tmp);
+	*t = a_symbol;
+	*w = (t_pdp_word)pdp_gensym(tmp);
+    }
+
+    D post("done parsing atom");
+
+}
+
+
+/* create a list from a character string */
+t_pdp_list *pdp_list_from_cstring(char *chardef, char **nextchar)
+{
+    t_pdp_list *l = pdp_list_new(0);
+    char *c = chardef;
+    char *lastname = c;
+    int n = 0;
+
+    D post ("creating list from char: %s", chardef);
+
+    /* find opening parenthesis and skip it*/
+    _skip_whitespace(&c);
+    if (!_is_left_separator(*c)) goto error; else c++;
+
+    /* start counting at the first non-whitespace
+       character after opening parenthesis */
+    _skip_whitespace(&c);
+    lastname = c;
+    n = 0;
+
+    while(*c){
+	if (!_is_separator(*c)){
+	    /* item not terminated: keep counting */
+	    c++;
+	    n++;
+	}
+	else {
+	    /* separator encountered whitespace or parenthesis */
+
+	    if (n){
+		/* if there was something between this and the previous
+		   separator, we've found and atom and parse it */
+		pdp_list_add_back(l, a_undef, (t_pdp_word)0);
+		_parse_atom(&l->last->t, &l->last->w, lastname, n);
+
+		/* skip the whitespace after the parsed word, if any */
+		_skip_whitespace(&c);
+	    }
+
+	    /* if we're at a right separator, we're done */
+	    if (_is_right_separator(*c)) {c++; goto done;}
+
+	    /* if it's a left separater, we have a sublist */
+	    if (_is_left_separator(*c)){
+		t_pdp_list *sublist = pdp_list_from_cstring(c, &c);
+		if (!sublist) goto error; //sublist had parse error
+		pdp_list_add_back(l, a_list, (t_pdp_word)sublist);
+	    }
+
+	    /* prepare for next atom */
+	    lastname = c;
+	    n = 0;
+	}
+
+    }
+
+ error:
+    /* end of string encountered: parse error */
+    D post("parse error: %s", c);
+    if (nextchar) *nextchar = c;
+    pdp_tree_free(l); //this will free all sublists too
+    return 0;
+
+	
+ done:
+    _skip_whitespace(&c);
+    if (nextchar) *nextchar = c;
+    return l;
+    
+    
+
+}
+
+
+/* traversal */
+void pdp_list_apply(t_pdp_list *l, t_pdp_atom_method m)
+{
+  t_pdp_atom *a;
+  if (!l) return;
+  for (a=l->first; a; a=a->next) m(a);
+}
+
+void pdp_tree_apply(t_pdp_list *l, t_pdp_atom_method m) 
+{
+  t_pdp_atom *a;
+  if (!l) return;
+  for (a=l->first; a; a=a->next){
+    if (a->t == a_list) pdp_tree_apply(a->w.w_list, m);
+    else m(a);
+  }
+}
+
+void pdp_list_apply_word_method(t_pdp_list *l, 
+				t_pdp_word_type type, t_pdp_word_method wm)
+{
+  t_pdp_atom *a;
+  if (!l) return;
+  for (a=l->first; a; a=a->next){
+    if (a->t == type) wm(a->w);
+  }
+}
+void pdp_list_apply_pword_method(t_pdp_list *l, 
+				t_pdp_word_type type, t_pdp_pword_method pwm)
+{
+  t_pdp_atom *a;
+  if (!l) return;
+  for (a=l->first; a; a=a->next){
+    if (a->t == type) pwm(&a->w);
+  }
+}
+
+void pdp_tree_apply_word_method(t_pdp_list *l, 
+				t_pdp_word_type type, t_pdp_word_method wm) 
+{
+  t_pdp_atom *a;
+  if (!l) return;
+  for (a=l->first; a; a=a->next){
+    if (a->t == a_list) pdp_tree_apply_word_method(a->w.w_list, type, wm);
+    else if (a->t == type) wm(a->w);
+  }
+}
+void pdp_tree_apply_pword_method(t_pdp_list *l, 
+				t_pdp_word_type type, t_pdp_pword_method pwm) 
+{
+  t_pdp_atom *a;
+  if (!l) return;
+  for (a=l->first; a; a=a->next){
+    if (a->t == a_list) pdp_tree_apply_pword_method(a->w.w_list, type ,pwm);
+    else if (a->t == type) pwm(&a->w);
+  }
+}
+
+static void _atom_packet_mark_unused(t_pdp_atom *a)
+{
+  if (a->t == a_packet){
+    pdp_packet_mark_unused(a->w.w_packet);
+    a->t = a_undef;
+    a->w.w_int = 0;
+  }
+}
+
+void pdp_tree_strip_packets  (t_pdp_list *l)
+{
+   pdp_tree_apply(l, _atom_packet_mark_unused);
+}
+
+
+/* debug */
+static void _pdp_atomlist_fprint(FILE* f, t_pdp_atom *a)
+{
+    fprintf(f, "(");
+    while (a){
+	switch(a->t){
+	case a_symbol:   fprintf(f, "%s",a->w.w_symbol->s_name); break;
+	case a_float:    fprintf(f, "%f",a->w.w_float); break;
+	case a_int:      fprintf(f, "%d",a->w.w_int); break;
+	case a_packet:   fprintf(f, "#<pdp %d %s>",a->w.w_packet,
+				 pdp_packet_get_description(a->w.w_packet)->s_name); break;
+	case a_pointer:  fprintf(f, "#<0x%08x>",(unsigned int)a->w.w_pointer); break;
+	case a_list:     _pdp_atomlist_fprint(f, a->w.w_list->first); break;
+	case a_undef:    fprintf(f, "undef"); break;
+
+	default:         fprintf(f, "unknown"); break;
+	}
+       	a = a->next;
+	if (a) fprintf(f, " ");
+    }
+    fprintf(f, ")");
+}
+
+void _pdp_list_fprint(FILE* f, t_pdp_list *l)
+{
+    _pdp_atomlist_fprint(f, l->first);
+    fprintf(f, "\n");
+}
+
+void pdp_list_print(t_pdp_list *l)
+{
+    _pdp_list_fprint(stderr, l);
+}
+
+
+/* public list operations */
+
+
+/* add a word to the start of the list */
+void pdp_list_add(t_pdp_list *l, t_pdp_word_type t, t_pdp_word w)
+{
+    t_pdp_atom *new_a = PDP_ATOM_ALLOC();
+    l->elements++;
+    new_a->next = l->first;
+    new_a->w = w;
+    new_a->t = t;
+    l->first = new_a;
+    if (!l->last) l->last = new_a;
+}
+
+
+/* add a word to the end of the list */
+void pdp_list_add_back(t_pdp_list *l, t_pdp_word_type t, t_pdp_word w)
+{
+    t_pdp_atom *new_a = PDP_ATOM_ALLOC();
+    l->elements++;
+    new_a->next = 0;
+    new_a->w = w;
+    new_a->t = t;
+    if (l->last){
+	l->last->next = new_a;
+    }
+    else{
+	l->first = new_a;
+    }
+    l->last = new_a;
+}
+
+/* get list size */
+int pdp_list_size(t_pdp_list *l)
+{
+    return l->elements;
+}
+
+
+
+
+/* pop: return first item and remove */
+t_pdp_word pdp_list_pop(t_pdp_list *l)
+{
+    t_pdp_atom *a = l->first;
+    t_pdp_word w;
+
+    w = a->w;
+    l->first = a->next;
+    PDP_ATOM_DEALLOC(a);
+    l->elements--;
+    if (!l->first) l->last = 0;
+
+    return w;
+}
+
+
+/* return element at index */
+t_pdp_word pdp_list_index(t_pdp_list *l, int index)
+{
+    t_pdp_atom *a;
+    for (a = l->first; index--; a = a->next);
+    return a->w;
+}
+
+
+
+
+
+/* remove an element from a list */
+void pdp_list_remove(t_pdp_list *l, t_pdp_word_type t, t_pdp_word w)
+{
+    t_pdp_atom head;
+    t_pdp_atom *a;
+    t_pdp_atom *kill_a;
+    head.next = l->first;
+
+    for(a = &head; a->next; a = a->next){
+	if (a->next->w.w_int == w.w_int && a->next->t == t){
+	    kill_a = a->next;        // element to be killed
+	    a->next = a->next->next; // remove link
+	    PDP_ATOM_DEALLOC(kill_a);
+	    l->elements--;
+	    l->first = head.next;    // restore the start pointer
+	    if (l->last == kill_a) { // restore the end pointer
+		l->last = (a != &head) ? a : 0;
+	    }
+
+	    break;
+	}
+    }
+    
+}
+
+
+
+
+
+/* copy a list */
+t_pdp_list* pdp_tree_copy_reverse(t_pdp_list *list)
+{
+    t_pdp_list *newlist = pdp_list_new(0);
+    t_pdp_atom *a;
+    for (a = list->first; a; a = a->next)
+	if (a->t == a_list){
+	    pdp_list_add(newlist, a->t, 
+			 (t_pdp_word)pdp_tree_copy_reverse(a->w.w_list));
+	}
+	else{
+	    pdp_list_add(newlist, a->t, a->w);
+	}
+    return newlist;
+}
+t_pdp_list* pdp_list_copy_reverse(t_pdp_list *list)
+{
+    t_pdp_list *newlist = pdp_list_new(0);
+    t_pdp_atom *a;
+    for (a = list->first; a; a = a->next)
+      pdp_list_add(newlist, a->t, a->w);
+    return newlist;
+}
+
+t_pdp_list* pdp_tree_copy(t_pdp_list *list)
+{
+    t_pdp_list *newlist = pdp_list_new(list->elements);
+    t_pdp_atom *a_src = list->first;
+    t_pdp_atom *a_dst = newlist->first;
+
+    while(a_src){
+	a_dst->t = a_src->t;
+	if (a_dst->t == a_list){ //recursively copy sublists (tree copy)
+	    a_dst->w.w_list = pdp_tree_copy(a_src->w.w_list);
+	}
+	else{
+	    a_dst->w = a_src->w;
+	}
+	a_src = a_src->next;
+	a_dst = a_dst->next;
+    }
+
+    return newlist;
+}
+t_pdp_list* pdp_list_copy(t_pdp_list *list)
+{
+    t_pdp_list *newlist = pdp_list_new(list->elements);
+    t_pdp_atom *a_src = list->first;
+    t_pdp_atom *a_dst = newlist->first;
+
+    while(a_src){
+	a_dst->t = a_src->t;
+	a_dst->w = a_src->w;
+	a_src = a_src->next;
+	a_dst = a_dst->next;
+    }
+    return newlist;
+}
+
+void pdp_list_cat (t_pdp_list *l, t_pdp_list *tail)
+{
+    t_pdp_list *tmp = pdp_list_copy(tail);
+    l->elements += tmp->elements;
+    l->last->next = tmp->first;
+    l->last = tmp->last;
+    _pdp_list_dealloc(tmp); //delete the list stub
+    
+}
+
+
+/* check if a list contains an element */
+int pdp_list_contains(t_pdp_list *list, t_pdp_word_type t, t_pdp_word w)
+{
+    t_pdp_atom *a;
+    for(a = list->first; a; a=a->next){
+	if (a->w.w_int == w.w_int && a->t == t) return 1;
+    }
+    return 0;
+}
+
+/* add a thing to the start of the list if it's not in there already */
+void pdp_list_add_to_set(t_pdp_list *list, t_pdp_word_type t, t_pdp_word w)
+{
+    if (!pdp_list_contains(list, t, w))
+	pdp_list_add(list, t, w);
+}
+
+
+
diff --git a/system/kernel/pdp_packet.c b/system/kernel/pdp_packet.c
new file mode 100644
index 0000000..a811381
--- /dev/null
+++ b/system/kernel/pdp_packet.c
@@ -0,0 +1,957 @@
+/*
+ *   Pure Data Packet system implementation: Packet Manager
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+
+#include "pdp.h"
+#include <stdio.h>
+#include <pthread.h>
+#include <unistd.h>
+#include <string.h>
+
+
+/* TODO:
+   implement an indexing system to the packet pool (array) to speed up searches.
+   -> a list of lists of recycled packes, arranged by packet type.
+   -> a list of unused slots
+*/
+   
+
+
+#define D if (0)
+
+/* all symbols are C style */
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+
+/* pdp specific constants */
+#define PDP_ALIGN 8
+
+/* this needs to be able to grow dynamically, think about it later */
+/* for ordinary work, this is enough and can help finding memory leaks */
+
+#define PDP_INITIAL_POOL_SIZE 1
+#define PDP_PACKET_MAX_MEM_USAGE -1
+
+/* the pool */
+static unsigned int pdp_packet_mem_usage;
+static unsigned int pdp_packet_max_mem_usage;
+static int pdp_pool_size;
+static t_pdp** pdp_pool;
+
+/* this is for detecting memory leaks */
+static int pdp_packet_count;
+
+/* some global vars */
+static t_symbol* pdp_sym_register_rw;
+static t_symbol* pdp_sym_register_ro;
+static t_symbol* pdp_sym_process;
+
+/* mutex */
+static pthread_mutex_t pdp_pool_mutex;
+
+/* the list of classes */
+static t_pdp_list *class_list;
+
+/* debug */
+void
+pdp_packet_print_debug(int packet)
+{
+    t_pdp *h = pdp_packet_header(packet);
+    post("debug info for packet %d", packet);
+    if (!h){
+	post("invalid packet");
+    }
+    else{
+	post ("\ttype: %d", h->type);
+	post ("\tdesc: %s", h->desc ? h->desc->s_name : "unknown");
+	post ("\tsize: %d", h->size);
+	post ("\tflags: %x", h->flags);
+	post ("\tusers: %d", h->users);
+	post ("\trefloc: %x", h->refloc);
+	post ("\tclass: %x", h->theclass);
+    }
+}
+
+
+
+/* setup methods */
+
+void 
+pdp_packet_setup(void)
+{
+
+    pdp_pool_size = PDP_INITIAL_POOL_SIZE;
+    pdp_packet_count = 0;
+    pdp_packet_mem_usage = 0;
+    pdp_packet_max_mem_usage = PDP_PACKET_MAX_MEM_USAGE;
+    pdp_pool = (t_pdp **)malloc(PDP_INITIAL_POOL_SIZE * sizeof(t_pdp *));
+    bzero(pdp_pool, pdp_pool_size * sizeof(t_pdp *));
+    pdp_sym_register_rw = gensym("register_rw");
+    pdp_sym_register_ro = gensym("register_ro");
+    pdp_sym_process = gensym("process");
+    pdp_packet_count = 0;
+    class_list = pdp_list_new(0);
+
+    pthread_mutex_init(&pdp_pool_mutex, NULL);
+}
+
+/* class methods */
+t_pdp_class *pdp_class_new(t_pdp_symbol *type, t_pdp_factory_method create){
+    t_pdp_class *c = (t_pdp_class *)pdp_alloc(sizeof(t_pdp_class));
+    memset(c, 0, sizeof(t_pdp_class));
+    c->create = create;
+    c->type = type; // set type
+    //c->attributes = pdp_list_new(0); // create an empty attribute list
+    pdp_list_add(class_list, a_pointer, (t_pdp_word)((void *)c));
+    //post("added class %s %x", c->type->s_name, c->create);
+
+    return c;
+}
+
+#if 0
+void pdp_class_addmethod(t_pdp_class *c, t_pdp_symbol *name, t_pdp_attribute_method method,
+			 t_pdp_list *in_spec, t_pdp_list *out_spec)
+{
+    t_pdp_attribute *attr = (t_pdp_attribute *)pdp_alloc(sizeof(t_pdp_attribute));
+    attr->name = name;
+    attr->method = method;
+    attr->in_spec = in_spec;
+    attr->out_spec = out_spec;
+    pdp_list_add_pointer(c->attributes, attr);
+    
+}
+#endif
+
+/* the packet factory */
+int pdp_factory_newpacket(t_pdp_symbol *type)
+{
+    t_pdp_class *c;
+    t_pdp_atom *a = class_list->first;
+    while(a){
+	c = (t_pdp_class *)(a->w.w_pointer);
+	if (c->type && pdp_type_description_match(type, c->type)){
+	    //post("method %x, type %s", c->create, type->s_name);
+	    return (c->create) ? (*c->create)(type) : -1;
+	}
+	a = a->next;
+    }
+    return -1;
+}
+
+#if 0
+/* generic methods. actually a forth word operation on a stack.
+   first item on stack must be a packet and it's type will
+   determine the place to look for the operator */
+int pdp_packet_op(t_pdp_symbol *operation, struct _pdp_list *stack)
+{
+    int packet = stack->first->w.w_packet;
+    t_pdp *h = pdp_packet_header(packet);
+    t_pdp_atom *i;
+    t_pdp_attribute *attr;
+
+    if (!(h && h->theclass)) goto exit;       
+
+    PDP_POINTER_IN(h->theclass->attributes, i, attr){
+	//post("attribute:%s", attr->name->s_name);
+	if (attr->name == operation){
+	    
+	    /* FOUND -> exec (check arguments first ???) */
+	    return attr->method (stack);
+	}
+	
+    }
+ exit:
+    // method not found
+    post ("WARNING: pdp_packet_op: packet %d from class %s has no operation %s", 
+	  packet, (h && h->theclass) ? h->theclass->type->s_name : "UNKNOWN", operation->s_name);
+    return 0;
+}
+
+#endif
+
+static void
+_pdp_pool_expand(void){
+    int i;
+
+    /* double the size */
+    int new_pool_size = pdp_pool_size << 1;
+    t_pdp **new_pool = (t_pdp **)malloc(new_pool_size * sizeof(t_pdp *));
+    bzero(new_pool, new_pool_size * sizeof(t_pdp *));
+    memcpy(new_pool, pdp_pool, pdp_pool_size * sizeof(t_pdp *));
+    free(pdp_pool);
+    pdp_pool = new_pool;
+    pdp_pool_size = new_pool_size;
+
+    D post("DEBUG: _pdp_pool_expand: resized pool to contain %d packets", pdp_pool_size);
+}
+
+
+
+
+/* private _pdp_packet methods */
+
+/* packets can only be created and destroyed using these 2 methods */
+/* it updates the mem usage and total packet count */
+
+static void
+_pdp_packet_dealloc(t_pdp *p)
+{
+    unsigned int size = p->size;
+    if (p->theclass && p->theclass->cleanup)
+	(*p->theclass->cleanup)(p);
+
+    free (p);
+    pdp_packet_mem_usage -= size;
+    pdp_packet_count--;
+    D post("DEBUG: _pdp_packet_new_dealloc: freed packet. pool contains %d packets", pdp_packet_count);
+}
+
+static t_pdp*
+_pdp_packet_alloc(unsigned int datatype, unsigned int datasize)
+{
+    unsigned int totalsize = datasize + PDP_HEADER_SIZE;
+    unsigned int align;
+    t_pdp *p = 0;
+
+    /* check if there is a memory usage limit */
+    if (pdp_packet_max_mem_usage){
+	/* if it would exceed the limit, fail */
+	if (pdp_packet_mem_usage + totalsize > pdp_packet_max_mem_usage){
+	    D post("DEBUG: _pdp_packet_new_alloc: memory usage limit exceeded");
+	    return 0;
+	}
+    }
+    p = (t_pdp *)malloc(totalsize);
+    if (p){
+	align = ((unsigned int)p) & (PDP_ALIGN - 1);
+	if (align) post("WARNING: _pdp_packet_alloc: data misaligned by %x", align);
+	memset(p, 0, PDP_HEADER_SIZE); //initialize header to 0
+	p->type = datatype;
+	p->size = totalsize;
+	p->users = 1;
+	pdp_packet_mem_usage += totalsize;
+	pdp_packet_count++;
+	D post("DEBUG: _pdp_packet_new_alloc: allocated new packet. pool contains %d packets, using %d bytes",
+	       pdp_packet_count, pdp_packet_mem_usage);
+    }
+
+    return p;
+}
+
+
+void 
+pdp_packet_destroy(void)
+{
+    int i = 0;
+    /* dealloc all the data in object stack */
+    post("DEBUG: pdp_packet_destroy: clearing object pool.");
+    while ((i < pdp_pool_size) && (pdp_pool[i])) _pdp_packet_dealloc(pdp_pool[i++]);
+}
+
+
+
+/* try to find a packet based on main type and datasize */
+static int
+_pdp_packet_reuse_type_size(unsigned int datatype, unsigned int datasize)
+{
+    unsigned int totalsize = datasize + PDP_HEADER_SIZE;
+    int i = 0;
+    int return_packet = -1;
+    t_pdp* p;
+
+    for (i=0; i < pdp_pool_size; i++){
+	p = pdp_pool[i];
+	/* check if we can reuse this one if it is already allocated */
+	if (p) {
+	    /* search for unused packets of equal size & type */
+	    if ((p->users == 0) && (p->size == totalsize) && (p->type == datatype)){
+		D post("DEBUG: _pdp_packet_reuse_type_size: can reuse %d", i);
+		
+		/* if possible, a packet will be reused and reinitialized
+		   i haven't found a use for this, so it's only used for discriminating
+		   between pure and not-so-pure packets */ 
+		if (p->theclass && p->theclass->reinit){
+		    (*p->theclass->reinit)(p);
+		}
+		/* if no re-init method is found, the header will be reset to all 0
+		   this ensures the header is in a predictable state */
+		else {
+		    memset(p, 0, PDP_HEADER_SIZE);
+		    p->type = datatype;
+		    p->size = totalsize;
+		}
+
+		p->users = 1;
+		return_packet = i;
+		goto exit;
+	    }
+	    else{
+	      D post("DEBUG _pdp_packet_reuse_type_size: can't reuse %d, (%d users)", i, p->users);
+	    }
+	}
+    }
+
+    D post("DEBUG: _pdp_packet_reuse_type_size: no reusable packet found");
+
+ exit:
+    return return_packet;
+}
+
+
+/* create a new packet in an empty slot.
+   if this fails, the garbage collector needs to be called */
+static int 
+_pdp_packet_create_in_empty_slot(unsigned int datatype, unsigned int datasize /*without header*/)
+{
+    unsigned int totalsize = datasize + PDP_HEADER_SIZE;
+    int i = 0;
+    int return_packet = -1;
+    int out_of_mem = 0;
+    t_pdp* p;
+
+
+    /* no reusable packets found, try to find an empty slot */
+    for (i=0; i < pdp_pool_size; i++){
+	p = pdp_pool[i];
+	if (!p) {
+	    p = _pdp_packet_alloc(datatype, datasize);
+
+	    if (!p) {
+		D post("DEBUG: _pdp_packet_create_in_empty_slot: out of memory (malloc returned NULL)");
+		return_packet = -1;
+		goto exit;
+	    }
+
+	    pdp_pool[i] = p;
+	    return_packet = i;
+	    goto exit;
+	}
+    }
+
+    /* if we got here the pool is full: resize the pool and try again */
+    _pdp_pool_expand();
+    return_packet = _pdp_packet_create_in_empty_slot(datatype, datasize);
+
+ exit:
+    return return_packet;
+
+}
+
+/* find an unused packet, free it and create a new packet.
+   if this fails, something is seriously wrong */
+static int 
+_pdp_packet_create_in_unused_slot(unsigned int datatype, unsigned int datasize /*without header*/)
+{
+    unsigned int totalsize = datasize + PDP_HEADER_SIZE;
+    int i = 0;
+    int return_packet = -1;
+    int out_of_mem = 0;
+    t_pdp* p;
+
+    D post("DEBUG: _pdp_packet_create_in_unused_slot: collecting garbage");
+		
+    /* search backwards */
+    for (i=pdp_pool_size-1; i >= 0; i--){
+	p = pdp_pool[i];
+	if (p){
+	    if (p->users == 0){
+		_pdp_packet_dealloc(p);
+		p = _pdp_packet_alloc(datatype, datasize);
+		pdp_pool[i] = p;
+
+		/* alloc succeeded, return */
+		if (p) {
+		    post("DEBUG _pdp_packet_create_in_unused_slot: garbage collect succesful");
+		    return_packet = i;
+		    goto exit;
+		}
+
+		/* alloc failed, continue collecting garbage */
+		D post("DEBUG _pdp_packet_create_in_unused_slot: freed one packet, still out of memory (malloc returned NULL)");
+		out_of_mem = 1;
+	    
+	    }
+	}
+    }
+
+    /* if we got here, we ran out of memory */
+    D post("DEBUG: _pdp_packet_create_in_unused_slot: out of memory after collecting garbage");
+    return_packet = -1;
+
+exit:
+    return return_packet;
+}
+
+/* warning: for "not so pure" packets, this method will only return an initialized
+   packet if it can reuse a privious one. that is, if it finds a reinit method
+   in the packet. use the pdp_packet_new_<type> constructor if possible */
+
+static int 
+_pdp_packet_brandnew(unsigned int datatype, unsigned int datasize /*without header*/)
+{
+    int return_packet = -1;
+
+    /* try to create a new packet in an empty slot */
+    return_packet = _pdp_packet_create_in_empty_slot(datatype, datasize);
+    if (return_packet != -1) goto exit;
+
+    /* if we still don't have a packet, we need to call the garbage collector until we can allocate */
+    return_packet = _pdp_packet_create_in_unused_slot(datatype, datasize);
+
+ exit:
+    return return_packet;
+}
+
+
+static int
+_pdp_packet_new(unsigned int datatype, unsigned int datasize /*without header*/)
+{
+    int return_packet = -1;
+
+    /* try to reuse a packet based on main type and datasize */
+    return_packet = _pdp_packet_reuse_type_size(datatype, datasize);
+    if (return_packet != -1) goto exit;
+
+    /* create a brandnew packet */
+    return_packet = _pdp_packet_brandnew(datatype, datasize);
+    if (return_packet != -1) goto exit;
+
+    post("WARNING: maximum packet memory usage limit (%d bytes) reached after garbage collect.", pdp_packet_max_mem_usage);
+    post("WARNING: increase memory limit or decrease packet usage (i.e. pdp_loop, pdp_delay).");
+    post("WARNING: pool contains %d packets, using %d bytes.", pdp_packet_count, pdp_packet_mem_usage);
+
+ exit:
+    return return_packet;
+       
+}
+
+
+
+/* public pool operations: have to be thread safe so each entry point
+   locks the mutex */
+
+/* reuse an old packet based on high level description */
+int
+pdp_packet_reuse(t_pdp_symbol *description)
+{
+    int i;
+    int return_packet = -1;
+    t_pdp *p;
+
+    /* LOCK */
+    pthread_mutex_lock(&pdp_pool_mutex);
+
+    for (i=0; i < pdp_pool_size; i++){
+	p = pdp_pool[i];
+	/* check if we can reuse this one if it is already allocated */
+	if ((p) && (p->users == 0) && (p->desc == description)){
+	    /* mark it as used */
+	    p->users = 1;
+	    return_packet = i;
+	    goto gotit; 
+	}
+    }
+
+ gotit:
+    /* LOCK */
+    pthread_mutex_unlock(&pdp_pool_mutex);
+
+    return return_packet;
+
+
+}
+
+/* create a new packet, or reuse an old one based on main type and size */
+int 
+pdp_packet_new(unsigned int datatype, unsigned int datasize /*without header*/)
+{
+    int packet;
+    /* LOCK */
+    pthread_mutex_lock(&pdp_pool_mutex);
+
+    packet = _pdp_packet_new(datatype, datasize);
+
+    /* UNLOCK */
+    pthread_mutex_unlock(&pdp_pool_mutex);
+    return packet;
+}
+
+
+/* create a brand new packet, don't reuse an old one */
+int 
+pdp_packet_brandnew(unsigned int datatype, unsigned int datasize /*without header*/)
+{
+    int packet;
+    /* LOCK */
+    pthread_mutex_lock(&pdp_pool_mutex);
+
+    packet = _pdp_packet_brandnew(datatype, datasize);
+
+    /* UNLOCK */
+    pthread_mutex_unlock(&pdp_pool_mutex);
+    return packet;
+}
+
+
+/* this returns a copy of a packet for read only access. */
+int
+pdp_packet_copy_ro(int handle)
+{
+    int out_handle = -1;
+    t_pdp* p;
+
+    /* LOCK */
+    pthread_mutex_lock(&pdp_pool_mutex);
+
+    if ((handle >= 0) 
+	&& (handle < pdp_pool_size) 
+	&& (p = pdp_pool[handle])){
+
+	/* it is an error to copy a packet without an owner */
+	if (!p->users){
+	    post("pdp_packet_copy_ro: ERROR: request to copy packet %d which has 0 users", handle);
+	    out_handle = -1;
+	}
+
+	/* if it's a passing packet, reset the reference location
+	   and turn it into a normal packet */
+	else if (p->refloc){
+	    *p->refloc = -1;
+	    p->refloc = 0;
+	    out_handle = handle;
+	}
+	/* if it's a normal packet, increase the number of users */
+	else {
+	    p->users++;
+	    out_handle = handle;
+	}
+    }
+    else out_handle = -1;
+
+    //post("pdp_copy_ro: outhandle:%d", out_handle);
+
+    /* UNLOCK */
+    pthread_mutex_unlock(&pdp_pool_mutex);
+
+    return out_handle;
+}
+
+/* copy a packet. if the packet is marked passing, it will be aquired.
+   otherwize a new packet will be created with a copy of the contents. */
+
+int
+pdp_packet_copy_rw(int handle)
+{
+    int out_handle = -1;
+    t_pdp* p;
+
+    /* LOCK */
+    pthread_mutex_lock(&pdp_pool_mutex);
+
+    if ((handle >= 0) 
+	&& (handle < pdp_pool_size) 
+	&& (p = pdp_pool[handle])){
+	/* if there are other users, copy the object otherwize return the same handle */
+
+	/* it is an error to copy a packet without an owner */
+	if (!p->users){
+	    post("pdp_packet_copy_rw: ERROR: request to copy packet %d which has 0 users", handle);
+	    out_handle = -1;
+	}
+
+	/* if it is a passing packet, remove the owner's reference to it */
+	else if (p->refloc){
+	    *p->refloc = -1;
+	    p->refloc = 0;
+	    out_handle = handle;
+	}
+
+	/* check if packet supports copy (for fanout) */
+	else if(p->flags & PDP_FLAG_DONOTCOPY) out_handle = -1;
+
+
+	/* copy the packet, since it already has 1 or more users */
+	else{
+	    int new_handle = _pdp_packet_new(p->type, p->size - PDP_HEADER_SIZE);
+	    t_pdp* new_p = pdp_packet_header(new_handle);
+
+	    /* check if valid */
+	    if (!new_p) out_handle = -1;
+
+	    else {
+		/* if a copy constructor is found, it will be called */
+		if (p->theclass && p->theclass->copy){
+		    (*p->theclass->copy)(new_p, p);
+		}
+		/* if not, the entire packet will be copied, assuming a pure data packet */
+		else {
+		    memcpy(new_p, p, p->size);
+		}
+		new_p->users = 1;
+		out_handle = new_handle;
+	    }
+	}
+
+	//post("pdp_copy_rw: inhandle:%d outhandle:%d", handle, out_handle);
+
+    }
+    else out_handle = -1;
+
+    /* UNLOCK */
+    pthread_mutex_unlock(&pdp_pool_mutex);
+    return out_handle;
+}
+
+/* create a new packet, copying the header data of another
+   packet, without copying the data */
+int
+pdp_packet_clone_rw(int handle)
+{
+    int out_handle;
+    t_pdp* p;
+
+    /* LOCK */
+    pthread_mutex_lock(&pdp_pool_mutex);
+
+    if ((handle >= 0) 
+	&& (handle < pdp_pool_size) 
+	&& (p = pdp_pool[handle])){
+
+	/* clone the packet header, don't copy the data */
+	int new_handle = _pdp_packet_new(p->type, p->size - PDP_HEADER_SIZE);
+	t_pdp* new_p = pdp_packet_header(new_handle);
+
+	/* if a clone initializer is found, it will be called */
+	if (p->theclass && p->theclass->clone){
+	    (*p->theclass->clone)(new_p, p);
+	}
+	/* if not, just the header will be copied, assuming a pure data packet */
+	else {
+	    memcpy(new_p, p, PDP_HEADER_SIZE);
+	}
+	new_p->users = 1;   /* the new packet has 1 user */
+	new_p->refloc = 0;  /* it is not a passing packet, even if the template was */
+	out_handle = new_handle;
+    }
+
+    else out_handle = -1;
+
+    /* UNLOCK */
+    pthread_mutex_unlock(&pdp_pool_mutex);
+
+    return out_handle;
+}
+
+void
+_pdp_packet_mark_unused_nolock(int handle)
+{
+    t_pdp* p;
+
+    if ((handle >= 0) && (handle < pdp_pool_size)){
+      if (p = pdp_pool[handle]) {
+	  /* mark_unused on a passing packet has no effect
+	     this is to support automatic conversion for passing packets
+	     so in order to delete a passing packet, it should be marked normal first */
+	  if (p->refloc){
+	      post("DEBUG: pdp_mark_unused called on a passing packet. ignored.");
+	      return;
+	  }
+
+	  /* decrease the refcount */
+	  if (p->users) {
+	      p->users--;
+	      //post("pdp_mark_unused: handle %d, users left %d", handle, p->users);
+	  }
+	  else {
+	      post("pdp_mark_unused: ERROR: handle %d has zero users (duplicate pdp_mark_unused ?)", handle);
+	}
+      }
+      else {
+	  post("pdp_mark_unused: ERROR: invalid handle %d: no associated object", handle);
+      }
+    }
+    
+    else {
+	/* -1 is the only invalid handle that doesn't trigger a warning */
+	if (handle != -1) post("pdp_mark_unused: WARNING: invalid handle %d: out of bound", handle);
+    }
+
+}
+
+/* mark a packet as unused, decreasing the reference count.
+   if the reference count reaches zero, the packet is ready to be recycled
+   by a new packet allocation. it is illegal to reference a packet with
+   reference count == zero. if the reference count is not == 1, only readonly
+   access is permitted. */
+
+void
+pdp_packet_mark_unused(int handle)
+{
+    /* LOCK */
+    pthread_mutex_lock(&pdp_pool_mutex);
+
+    _pdp_packet_mark_unused_nolock(handle);
+
+    /* UNLOCK */
+    pthread_mutex_unlock(&pdp_pool_mutex);
+}
+
+void
+pdp_packet_mark_unused_atomic(int *handle)
+{
+    /* LOCK */
+    pthread_mutex_lock(&pdp_pool_mutex);
+
+    _pdp_packet_mark_unused_nolock(*handle);
+    *handle = -1;
+
+    /* UNLOCK */
+    pthread_mutex_unlock(&pdp_pool_mutex);
+}
+
+/* delete a packet. this is more than mark_unused:
+   it actually removes any reference. can be used for
+   some packet types that have "expensive" resources. 
+   usually this is up to the garbage collector to call. */
+
+void
+pdp_packet_delete(int handle)
+{
+    t_pdp *header = pdp_packet_header(handle);
+
+    /* LOCK */
+    pthread_mutex_lock(&pdp_pool_mutex);
+
+
+    /* check if it's a valid handle */
+    if ((handle >= 0) && (handle < pdp_pool_size) && pdp_pool[handle]){
+
+	/* mark it unused */
+	_pdp_packet_mark_unused_nolock(handle);
+
+	/* if no users, dealloc */
+	if (!header->users){
+	    _pdp_packet_dealloc(header);
+	    pdp_pool[handle] = NULL;
+	}
+
+	/* print a warning if failed */
+	else{
+	    post("WARNING: pdp_packet_delete: packet %d was not deleted. %d users remaining", 
+		 handle, header->users);
+	}
+    }
+
+    /* UNLOCK */
+    pthread_mutex_unlock(&pdp_pool_mutex);
+
+}
+
+
+/* this turns any packet into a normal (non-passing) packet */
+
+void
+pdp_packet_unmark_passing(int packet)
+{
+    t_pdp* header = pdp_packet_header(packet);
+    if (!header) return;
+
+    /* LOCK */
+    pthread_mutex_lock(&pdp_pool_mutex);
+
+    header->refloc = 0;
+
+    /* UNLOCK */
+    pthread_mutex_unlock(&pdp_pool_mutex);
+
+}
+
+
+/* this marks a packet as passing. this means it changes
+   owner on first copy_ro or copy_rw. the previous owner is
+   notified by setting the handler to -1. */
+
+void
+pdp_packet_mark_passing(int *phandle)
+{
+    t_pdp* header = pdp_packet_header(*phandle);
+
+    /* LOCK */
+    pthread_mutex_lock(&pdp_pool_mutex);
+
+    if (header){
+	if (header->refloc){
+	    post("pdp_packet_mark_passing: ERROR: duplicate mark_passing on packet %d", *phandle);
+	}
+	else if (1 != header->users){
+	    post("pdp_packet_mark_passing: ERROR: packet %d is not exclusively owned by caller, it has %d users", *phandle, header->users);
+	}
+	else {
+	    header->refloc = phandle;
+	}
+    }
+
+    /* UNLOCK */
+    pthread_mutex_unlock(&pdp_pool_mutex);
+
+}
+
+
+/* public data access methods */
+
+t_pdp*
+pdp_packet_header(int handle)
+{
+    if ((handle >= 0) && (handle < pdp_pool_size)) return pdp_pool[handle];
+    else return 0;
+}
+
+void*
+pdp_packet_subheader(int handle)
+{
+    t_pdp* header = pdp_packet_header(handle);
+    if (!header) return 0;
+    return (void *)(&header->info.raw);
+}
+
+void*
+pdp_packet_data(int handle)
+{
+    t_pdp *h;
+    if ((handle >= 0) && (handle < pdp_pool_size)) 
+	{
+	    h = pdp_pool[handle];
+	    if (!h) return 0;
+	    return (char *)(h) + PDP_HEADER_SIZE;
+	}
+    else return 0;
+}
+
+
+/* OBSOLETE: use packet description */
+/* check if two packets are allocated and of the same type */
+bool pdp_packet_compat(int packet0, int packet1)
+{
+
+    t_pdp *header0 = pdp_packet_header(packet0);
+    t_pdp *header1 = pdp_packet_header(packet1);
+
+    if (!(header1)){
+	//post("pdp_type_compat: invalid header packet1");
+	return 0;
+    }
+    if (!(header0)){
+	//post("pdp_type_compat: invalid header packet 0");
+	return 0;
+    }
+    if (header0->type != header1->type){
+	//post("pdp_type_compat: types do not match");
+	return 0;
+    }
+
+    return 1;
+}
+
+int pdp_packet_writable(int packet) /* returns true if packet is writable */
+{
+    t_pdp *h = pdp_packet_header(packet);
+    if (!h) return 0;
+    return (h->users == 1);
+}
+
+void pdp_packet_replace_with_writable(int *packet) /* replaces a packet with a writable copy */
+{
+    int new_p;
+    if (!pdp_packet_writable(*packet)){
+	new_p = pdp_packet_copy_rw(*packet);
+	pdp_packet_mark_unused(*packet);
+	*packet = new_p;
+    }
+	
+}
+
+/* pool stuff */
+
+int
+pdp_pool_collect_garbage(void)
+{
+    t_pdp *p;
+    int i;
+    int nbpackets = pdp_packet_count;
+
+    /* LOCK */
+    pthread_mutex_lock(&pdp_pool_mutex);
+
+    for (i=0; i < pdp_pool_size; i++){
+	p = pdp_pool[i];
+	if(p && !p->users) {
+	    _pdp_packet_dealloc(p);
+	    pdp_pool[i] = 0;
+	}
+    }
+    nbpackets -= pdp_packet_count;
+    //post("pdp_pool_collect_garbage: deleted %d unused packets", nbpackets);
+
+    /* UNLOCK */
+    pthread_mutex_unlock(&pdp_pool_mutex);
+
+    return nbpackets;
+}
+
+void
+pdp_pool_set_max_mem_usage(int max)
+{
+    if (max < 0) max = 0;
+    pdp_packet_max_mem_usage = max;
+    
+}
+
+
+
+
+
+
+/* malloc wrapper that calls garbage collector */
+void *pdp_alloc(int size)
+{
+    void *ptr = malloc(size);
+    
+    //post ("malloc called for %d bytes", size);
+
+    if (ptr) return ptr;
+
+    post ("malloc failed in a pdp module: running garbage collector.");
+
+    pdp_pool_collect_garbage();
+    return malloc(size);
+}
+
+
+void pdp_dealloc(void *stuff)
+{
+    free (stuff);
+}
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/system/kernel/pdp_queue.c b/system/kernel/pdp_queue.c
new file mode 100644
index 0000000..665a236
--- /dev/null
+++ b/system/kernel/pdp_queue.c
@@ -0,0 +1,347 @@
+/*
+ *   Pure Data Packet - processor queue module.
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+
+
+/* 
+   this is a the processor queue pdp system module 
+   it receives tasks from objects that are schedules to 
+   be computed in another thread. the object is signalled back
+   when the task is completed.
+
+   this is not a standard pd class. it is a sigleton class
+   using a standard pd clock to poll for compleded methods on 
+   every scheduler run. this is a hack to do thread synchronization 
+   in a thread unsafe pd.
+
+   the queue object can be reused. the pdp system however only
+   has one instance (one pdp queue. pdp remains a serial program.)
+
+ */
+
+#include "pdp.h"
+#include <pthread.h>
+#include <unistd.h>
+#include <stdio.h>
+
+
+#define D if (0)
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#define PDP_QUEUE_LOGSIZE 10
+#define PDP_QUEUE_DELTIME 10.0f
+
+
+
+
+/********************* general purpose pd process queue class *********************/
+
+void pdp_procqueue_wait(t_pdp_procqueue *q)
+{
+    D post("pdp_procqueue_wait(%x): waiting for pdp_queue_thread to finish processing", q);
+    pthread_mutex_lock(&q->mut);
+    while(((q->curr - q->head) & q->mask) != 0){
+
+	  pthread_cond_wait(&q->cond_processingdone, &q->mut);
+    }
+    pthread_mutex_unlock(&q->mut);
+    D post("pdp_procqueue_wait(%x): pdp_procqueue_thread has finished processing", q);
+
+}
+void pdp_procqueue_finish(t_pdp_procqueue *q, int index)
+{
+
+  if (-1 == index) {
+      //post("pdp_pq_remove: index == -1");
+      return;
+  }
+  /* wait for processing thread to finish*/
+  pdp_procqueue_wait(q);
+
+  /* invalidate callback at index */
+  q->q[index & q->mask].x_callback = 0;
+  q->q[index & q->mask].x_queue_id = 0;
+
+}
+
+static void pdp_procqueue_signal_processor(t_pdp_procqueue *q)
+{
+
+    //NOTE: uncommenting these post statements causes a libc crash
+    //in mutex lock in putc
+    //D post("pdp_procqueue_signal_processor(%x): signalling process thread", q);
+    pthread_mutex_lock(&q->mut);
+    pthread_cond_signal(&q->cond_dataready);
+    pthread_mutex_unlock(&q->mut);
+    //D post("pdp_procqueue_signal_processor(%x): signalling done", q);
+
+
+}
+
+static void pdp_procqueue_wait_for_feeder(t_pdp_procqueue *q)
+{
+
+
+    /* only use locking when there is no data */
+    if(((q->curr - q->head) & q->mask) == 0){
+
+	/* signal processing done */
+	D post("pdp_procqueue_wait_for_feeder(%x): signalling processing is done", q);
+	pthread_mutex_lock(&q->mut);
+	pthread_cond_signal(&q->cond_processingdone);
+
+	/* wait until there is an item in the queue */
+	while(((q->curr - q->head) & q->mask) == 0){
+	    pthread_cond_wait(&q->cond_dataready, &q->mut);
+	}
+
+	pthread_mutex_unlock(&q->mut);
+	D post("pdp_procqueue_wait_for_feeder(%x): waiting done", q);
+
+    }
+}
+
+void pdp_procqueue_add(t_pdp_procqueue *q, void *owner, void *process, void *callback, int *queue_id)
+{
+    int i;
+
+    /* if processing is in not in thread, just call the funcs */
+    if (!q->use_thread){
+	D post("pdp_procqueue_add(%q): calling processing routine directly", q);
+	if (queue_id) *queue_id = -1;
+	if (process)  ((t_pdpmethod) process)(owner);
+	if (callback) ((t_pdpmethod) callback)(owner);
+	return;
+    }
+	
+
+    /* if queue is full, call directly */
+    if (1 == ((q->tail - q->head) & q->mask)) {
+	//post("pdp_procqueue_add: WARNING: processing queue (%x) is full.\n", q);
+	//post("pdp_procqueue_add: WARNING: tail %x, head %x, mask %x.\n", q->tail, q->head, q->mask);
+	//post("pdp_procqueue_add: WARNING: skipping process method, calling callback directly.\n");
+	if (queue_id) *queue_id = -1;
+	if (callback) ((t_pdpmethod) callback)(owner);
+	return;
+	//exit(1);
+    }
+
+    /* schedule method in thread queue */
+    i = q->head & q->mask;
+    q->q[i].x_owner = owner;
+    q->q[i].x_process = process;
+    q->q[i].x_callback = callback;
+    q->q[i].x_queue_id = queue_id;
+    if (queue_id) *queue_id = i;
+    //post("pdp_queue_add: added method to queue, index %d", i);
+
+      
+    // increase the packet count
+    q->packets++;
+  
+    // move head forward
+    q->head++;
+
+    pdp_procqueue_signal_processor(q);
+
+}
+
+
+/* processing thread */
+static void *pdp_procqueue_thread(void *vq)
+{
+    t_pdp_procqueue *q = (t_pdp_procqueue *)vq;
+
+    D post("pdp_procqueue_thread(%x): thread started", q);
+
+    while(1){
+	t_process_queue_item *p;
+
+
+	D post("pdp_procqueue_thread(%x): waiting for feeder", q);
+
+	/* wait until there is data available */
+	pdp_procqueue_wait_for_feeder(q);      
+
+
+	D post("pdp_procqueue_thread(%x): processing %d", q, q->curr & q->mask);
+
+	
+	/* call the process routine */
+	p = &q->q[q->curr & q->mask];
+	if (p->x_process) 
+	    (p->x_process)(p->x_owner);
+
+	/* advance */
+	q->curr++;
+
+
+    }
+}
+
+
+/* call back all the callbacks */
+static void pdp_procqueue_callback (t_pdp_procqueue *q)
+{
+
+  /* call callbacks for finished packets */
+  while(0 != ((q->curr - q->tail) & q->mask))
+    {
+      int i = q->tail & q->mask;
+      /* invalidate queue id */
+      if(q->q[i].x_queue_id) *q->q[i].x_queue_id = -1;
+      /* call callback */
+      if(q->q[i].x_callback) (q->q[i].x_callback)(q->q[i].x_owner);
+      //else post("pdp_pq_tick: callback %d is disabled",i );
+      q->tail++;
+    }
+
+}
+
+/* the clock method */
+static void pdp_procqueue_tick (t_pdp_procqueue *q)
+{
+  /* do work */
+  //if (!(ticks % 1000)) post("pdp tick %d", ticks);
+
+  if (!q->use_thread) return;
+
+  /* call callbacks */
+  pdp_procqueue_callback(q);
+
+  /* increase counter */
+  q->ticks++;
+
+  /* set clock for next update */
+  clock_delay(q->pdp_clock, q->deltime);
+}
+
+
+
+void pdp_procqueue_use_thread(t_pdp_procqueue* q, int t)
+{
+    /* if thread usage is being disabled, 
+       wait for thread to finish processing first */
+    if (t == 0) {
+	pdp_procqueue_wait(q);
+	q->use_thread = 0;
+	pdp_procqueue_callback(q);
+	clock_unset(q->pdp_clock);
+    }
+    else {
+	clock_unset(q->pdp_clock);
+	clock_delay(q->pdp_clock, q->deltime);
+	q->use_thread = 1;
+    }
+
+}
+
+void pdp_procqueue_init(t_pdp_procqueue *q, double milliseconds, int logsize)
+{
+    pthread_attr_t attr;
+    int size = 1 << logsize;
+
+    /* setup pdp queue processor object */
+    q->ticks = 0;
+    q->deltime = milliseconds;
+
+    /* setup queue data */
+    q->mask = size - 1;
+    q->head = 0;
+    q->tail = 0;
+    q->curr = 0;
+    q->q = pdp_alloc(size * sizeof(t_process_queue_item));
+    memset(q->q, 0, size * sizeof(t_process_queue_item));
+
+    /* enable threads */
+    q->use_thread = 1;
+
+    /* setup synchro stuff */
+    pthread_mutex_init(&q->mut, NULL);
+    pthread_cond_init(&q->cond_dataready, NULL);
+    pthread_cond_init(&q->cond_processingdone, NULL);
+
+ 
+    /* allocate the clock */
+    q->pdp_clock = clock_new(q, (t_method)pdp_procqueue_tick);
+
+    /* set the clock */
+    clock_delay(q->pdp_clock, 0);
+
+    /* start processing thread */
+
+    /* glibc doc says SCHED_OTHER is default,
+       but it seems not to be when initiated from a RT thread
+       so we explicitly set it here */
+    pthread_attr_init (&attr);
+    //pthread_attr_setschedpolicy(&attr, SCHED_FIFO); 
+    pthread_attr_setschedpolicy(&attr, SCHED_OTHER); 
+
+    D post("pdp_procqueue_init(%x): starting thread", q);
+    pthread_create(&q->thread_id, &attr, pdp_procqueue_thread, (void *)q);
+    D post("pdp_procqueue_init(%x): back in pd thread", q);
+
+    /* wait for processing thread to finish */
+    //pdp_procqueue_wait(q);
+
+    /* set default disable/enable thread here */
+    //post("pdp_queue: THREAD PROCESSING ON BY DEFAULT!!");
+    pdp_procqueue_use_thread(q,0);
+
+}
+
+
+
+
+/* the (static) pdp queue object */
+static t_pdp_procqueue pdp_queue;
+
+
+/* get the default queue */
+t_pdp_procqueue *pdp_queue_get_queue(void){return &pdp_queue;}
+
+
+#if 1
+/* default pdp queue shortcut methods */
+void pdp_queue_wait() {pdp_procqueue_wait(&pdp_queue);}
+void pdp_queue_finish(int index) { pdp_procqueue_finish(&pdp_queue, index);}
+void pdp_queue_add(void *owner, void *process, void *callback, int *queue_id) {
+    pdp_procqueue_add(&pdp_queue, owner, process, callback, queue_id);
+}
+void pdp_queue_use_thread(int t) {pdp_procqueue_use_thread(&pdp_queue, t);}
+void pdp_queue_setup(void){
+    pdp_procqueue_init(&pdp_queue, PDP_QUEUE_DELTIME, PDP_QUEUE_LOGSIZE);
+    pdp_procqueue_use_thread(&pdp_queue,0);
+}
+#endif
+
+
+
+
+
+
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/system/kernel/pdp_type.c b/system/kernel/pdp_type.c
new file mode 100644
index 0000000..c220269
--- /dev/null
+++ b/system/kernel/pdp_type.c
@@ -0,0 +1,501 @@
+/*
+ *   Pure Data Packet system implementation. : code for handling different packet types
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+
+/* this file contains type handling routines */
+
+#include <stdarg.h>
+#include <string.h>
+#include <pthread.h>
+#include "pdp.h"
+
+
+// debug
+#define D if (0)
+
+
+static t_pdp_list *conversion_list;
+
+#define INIT_MAX_CACHE_SIZE 32
+
+static t_pdp_list *cached_conversion_list;
+static int max_cache_size;
+
+/* mutex */
+static pthread_mutex_t pdp_hash_mutex;
+static pthread_mutex_t pdp_conversion_mutex;
+static pthread_mutex_t pdp_cache_mutex;
+
+#define HASHSIZE 1024
+static t_pdp_symbol *pdp_symhash[HASHSIZE];
+
+
+/* shamelessly copied from pd src and made thread safe */
+t_pdp_symbol *_pdp_dogensym(char *s, t_pdp_symbol *oldsym)
+{
+    t_pdp_symbol **sym1, *sym2;
+    unsigned int hash1 = 0,  hash2 = 0;
+    int length = 0;
+    char *s2 = s;
+    while (*s2)
+    {
+        hash1 += *s2;
+        hash2 += hash1;
+        length++;
+        s2++;
+    }
+    sym1 = pdp_symhash + (hash2 & (HASHSIZE-1));
+
+    /* lock hash */
+    pthread_mutex_lock(&pdp_hash_mutex);
+
+    while (sym2 = *sym1)
+    {
+        if (!strcmp(sym2->s_name, s)) goto gotit;
+        sym1 = &sym2->s_next;
+    }
+    if (oldsym) sym2 = oldsym;
+    else
+    {
+        sym2 = (t_pdp_symbol *)pdp_alloc(sizeof(*sym2));
+        sym2->s_name = pdp_alloc(length+1);
+	_pdp_symbol_clear_namespaces(sym2);
+        sym2->s_next = 0;
+        strcpy(sym2->s_name, s);
+    }
+    *sym1 = sym2;
+
+ gotit:
+
+    /* unlock hash */
+    pthread_mutex_unlock(&pdp_hash_mutex);
+    return (sym2);
+}
+
+t_pdp_symbol *pdp_gensym(char *s)
+{
+    return(_pdp_dogensym(s, 0));
+}
+
+/* convert a type to a list */
+t_pdp_list *pdp_type_to_list(t_pdp_symbol *type)
+{
+    char *c = type->s_name;
+    char *lastname = c;
+    char tmp[100];
+    int n = 0;
+    t_pdp_list *l = pdp_list_new(0);
+
+    while(*c){
+	if (*c == '/'){
+	    strncpy(tmp, lastname, n);
+	    tmp[n] = 0;
+	    pdp_list_add_back(l, a_symbol, (t_pdp_word)pdp_gensym(tmp));
+	    c++;
+	    lastname = c;
+	    n = 0;
+	}
+	else{
+	    c++;
+	    n++;
+	}
+    }
+    pdp_list_add_back(l, a_symbol, (t_pdp_word)pdp_gensym(lastname));
+
+    return l;
+}
+
+
+/* get the description symbol. this includes some compat transition stuff with a warning */
+t_pdp_symbol *pdp_packet_get_description(int packet)
+{
+    t_pdp *header = pdp_packet_header(packet);
+
+    if (!header) return pdp_gensym("invalid");
+    else if (!header->desc){
+
+	post("ERROR: pdp_packet_get_description: packet %d has no description.", packet);
+	pdp_packet_print_debug(packet);
+	return pdp_gensym("unknown");
+    }
+    else return header->desc;
+}
+
+
+
+/* this runs a conversion program */
+int _pdp_type_run_conversion_program(t_pdp_conversion_program *program,
+	 			    int packet, t_pdp_symbol *dest_template)
+{
+    /* run a conversion program:
+       treat the source packet as readonly, and cleanup intermediates, such
+       that the net result is the production of a new packet, with the
+       source packet intact. */
+
+    int p, tmp;
+    t_pdp_atom *a;
+    t_pdp_conversion_method m;
+
+    // run the first line of the program
+    a = program->first;
+    m = a->w.w_pointer;
+    D post("DEBUG: _pdp_type_run_conversion_program: method = %x", m);
+    p = m(packet, dest_template);
+    D post("DEBUG: _pdp_type_run_conversion_program: packet returned = %d, type = %s", p, pdp_packet_get_description(p)->s_name);
+
+    // run the remaining lines + cleanup intermediates
+    for (a=a->next; a; a=a->next){
+	m = a->w.w_pointer;
+	D post("DEBUG: _pdp_type_run_conversion_program: next method ptr = %x", m);
+	tmp = m(p, dest_template);
+	pdp_packet_mark_unused(p);
+	p = tmp;
+    }
+    return p;
+}
+
+
+/* find a conversion program */
+t_pdp_conversion_program *
+_pdp_type_find_conversion_program(t_pdp_symbol *src_pattern, t_pdp_symbol *dst_pattern)
+{
+    t_pdp_conversion *c;
+    t_pdp_atom *a;
+    t_pdp_conversion_program *retval = 0;
+
+    /* lock conversion list */
+    pthread_mutex_lock(&pdp_conversion_mutex);
+
+    for (a = conversion_list->first; a; a=a->next){
+	c = a->w.w_pointer;
+	/* can be a wildcard match */
+	if (pdp_type_description_match(src_pattern, c->src_pattern) &&
+	    pdp_type_description_match(dst_pattern, c->dst_pattern)) {
+	    /* found a program */
+	    D post("DEBUG: _pdp_type_find_conversion_program: found: %s -> %s", c->src_pattern->s_name, c->dst_pattern->s_name);
+	    retval = c->program;
+	    goto gotit;
+	}
+    }
+
+    /* no conversion program was found */
+    retval = 0;
+ gotit:
+
+    /* lock conversion list */
+    pthread_mutex_unlock(&pdp_conversion_mutex);
+    return retval;
+}
+
+/* find a cached conversion program 
+ if one is found it will be moved to the back of the queue (MRU) */
+t_pdp_conversion_program *
+_pdp_type_find_cached_conversion_program(t_pdp_symbol *src_pattern, t_pdp_symbol *dst_pattern)
+{
+    t_pdp_conversion *c, *c_tmp;
+    t_pdp_atom *a;
+    t_pdp_conversion_program *retval = 0;
+
+    /* lock cached list */
+    pthread_mutex_lock(&pdp_cache_mutex);
+
+    for (a = cached_conversion_list->first; a; a=a->next){
+	c = a->w.w_pointer;
+	/* must be exact match */
+	if ((src_pattern == c->src_pattern) &&
+	    (dst_pattern == c->dst_pattern)) {
+
+	    /* found a program */
+	    D post("DEBUG: _pdp_type_find_cached_conversion_program: found: %s -> %s", c->src_pattern->s_name, c->dst_pattern->s_name);
+	    retval = c->program;
+
+	    /* make MRU (move to back) */
+	    c_tmp = cached_conversion_list->last->w.w_pointer;
+	    cached_conversion_list->last->w.w_pointer = c;
+	    a->w.w_pointer = c_tmp;
+	    goto gotit;
+	}
+    }
+
+    retval = 0;
+
+ gotit:
+
+
+    /* un lock cached list */
+    pthread_mutex_unlock(&pdp_cache_mutex);
+
+    /* no conversion program was found */
+    return retval;
+}
+
+
+/* conversion program manipulations */
+void pdp_conversion_program_free(t_pdp_conversion_program *program)
+{
+    pdp_list_free(program);
+}
+
+/* debug print */
+void _pdp_conversion_program_print(t_pdp_conversion_program *program)
+{
+    post("_pdp_conversion_program_print %x", program);
+    pdp_list_print(program);
+}
+
+t_pdp_conversion_program *pdp_conversion_program_new(t_pdp_conversion_method method, ...)
+{
+    t_pdp_conversion_program *p = pdp_list_new(0);
+    t_pdp_conversion_method m = method;
+    va_list ap;
+
+    D post("DEBUG: pdp_conversion_program_new:BEGIN");
+
+    pdp_list_add_back_pointer(p, m);
+    va_start(ap, method);
+    while (m = va_arg(ap, t_pdp_conversion_method)) pdp_list_add_back_pointer(p, m);
+    va_end(ap);
+
+    D post("DEBUG: pdp_conversion_program_new:END");
+ 
+    return p;
+}
+
+t_pdp_conversion_program *pdp_conversion_program_copy(t_pdp_conversion_program *program)
+{
+    if (program) return pdp_list_copy(program);
+    else return 0;
+}
+
+void pdp_conversion_program_add(t_pdp_conversion_program *program, t_pdp_conversion_program *tail)
+{ 
+    return pdp_list_cat(program, tail);
+}
+
+/* conversion registration */
+void pdp_type_register_conversion (t_pdp_symbol *src_pattern, t_pdp_symbol *dst_pattern, t_pdp_conversion_program *program)
+{
+    t_pdp_conversion *c = (t_pdp_conversion *)pdp_alloc(sizeof(*c));
+    c->src_pattern = src_pattern;
+    c->dst_pattern = dst_pattern;
+    c->program = program;
+
+    /* lock conversion list */
+    pthread_mutex_lock(&pdp_conversion_mutex);
+
+    pdp_list_add_back_pointer(conversion_list, c);
+
+    /* unlock conversion list */
+    pthread_mutex_unlock(&pdp_conversion_mutex);
+    
+}
+
+/* register a cached conversion */
+void pdp_type_register_cached_conversion (t_pdp_symbol *src_pattern, t_pdp_symbol *dst_pattern, t_pdp_conversion_program *program)
+{
+
+    /* create the new conversion */
+    t_pdp_conversion *c = (t_pdp_conversion *)pdp_alloc(sizeof(*c));
+    c->src_pattern = src_pattern;
+    c->dst_pattern = dst_pattern;
+    c->program = program;
+
+    /* lock cached conversion list */
+    pthread_mutex_lock(&pdp_cache_mutex);
+
+    /* check size, and remove LRU (top) if the cache is full */
+    while (cached_conversion_list->elements >= max_cache_size){
+	t_pdp_conversion *c_old = pdp_list_pop(cached_conversion_list).w_pointer;
+	if (c_old->program) pdp_conversion_program_free(c_old->program);
+	pdp_dealloc(c_old);
+    }
+    
+    /* add and make MRU (back) */
+    pdp_list_add_back_pointer(cached_conversion_list, c);
+
+    /* unlock cached conversion list */
+    pthread_mutex_unlock(&pdp_cache_mutex);
+}
+
+/* convert a given packet to a certain type (template) */
+int _pdp_packet_convert(int packet, t_pdp_symbol *dest_template)
+{
+    t_pdp_symbol *type = pdp_packet_get_description(packet);
+    t_pdp_symbol *tmp_type = 0;
+    int tmp_packet = -1;
+
+    t_pdp_conversion_program *program = 0;
+    t_pdp_conversion_program *program_last = 0;
+    t_pdp_conversion_program *program_tail = 0;
+
+    /* check if there is a program in the cached list, if so run it */
+    if (program = _pdp_type_find_cached_conversion_program(type, dest_template))
+	return _pdp_type_run_conversion_program(program, packet, dest_template);
+
+    /* if it is not cached, iteratively convert 
+       and save program on top of cache list if a conversion path (program) was found */
+
+    // run first conversion that matches
+    program = pdp_conversion_program_copy(_pdp_type_find_conversion_program(type, dest_template));
+    program_last = program;
+    if (!program){
+	D post("DEBUG: pdp_type_convert: (1) can't convert %s to %s", type->s_name, dest_template->s_name);
+	return -1;
+    }
+    tmp_packet = _pdp_type_run_conversion_program(program, packet, dest_template);
+    tmp_type = pdp_packet_get_description(tmp_packet);
+
+    // run more conversions if necessary, deleting intermediate packets
+    while (!pdp_type_description_match(tmp_type, dest_template)){
+	int new_packet;
+	program_tail = _pdp_type_find_conversion_program(tmp_type, dest_template);
+	if (!program_tail){
+	    D post("DEBUG: pdp_type_convert: (2) can't convert %s to %s", tmp_type->s_name, dest_template->s_name);
+	    pdp_packet_mark_unused(tmp_packet);
+	    pdp_conversion_program_free(program);
+	    return -1;
+	}
+	if (program_last == program_tail){
+	    post("ERROR: pdp_packet_convert: conversion loop detected");
+	}
+	program_last = program_tail;
+
+	pdp_conversion_program_add(program, program_tail);
+	new_packet = _pdp_type_run_conversion_program(program_tail, tmp_packet, dest_template);
+	pdp_packet_mark_unused(tmp_packet);
+	tmp_packet = new_packet;
+	tmp_type = pdp_packet_get_description(tmp_packet);
+    }
+
+    // save the conversion program
+    pdp_type_register_cached_conversion(type, dest_template, program);
+
+    // return resulting packet
+    return tmp_packet;
+	
+}
+
+/* convert or copy ro */
+int pdp_packet_convert_ro(int packet, t_pdp_symbol *dest_template)
+{
+    t_pdp_symbol *type = pdp_packet_get_description(packet);
+
+    /* if it is compatible, return a ro copy */
+    if (pdp_type_description_match(type, dest_template)) return pdp_packet_copy_ro(packet);
+
+    /* if not, convert to a new type */
+    else return _pdp_packet_convert(packet, dest_template);
+}
+
+/* convert or copy rw */
+int pdp_packet_convert_rw(int packet, t_pdp_symbol *dest_template)
+{
+    t_pdp_symbol *type = pdp_packet_get_description(packet);
+
+    /* if it is compatible, just return a rw copy */
+    if (pdp_type_description_match(type, dest_template)) return pdp_packet_copy_rw(packet);
+
+    /* if not, convert to a new type */
+    else return _pdp_packet_convert(packet, dest_template);
+}
+
+
+static void _setup_type_cache(t_pdp_symbol *s)
+{
+    t_pdp_list *l = pdp_type_to_list(s); 
+    pthread_mutex_lock(&pdp_hash_mutex); //lock to prevent re-entry
+    if (!s->s_type){
+	s->s_type = l;
+	l = 0;
+    }
+    pthread_mutex_unlock(&pdp_hash_mutex);
+    if (l) pdp_list_free(l);
+}
+
+/* check if a type description fits a template
+   this function is symmetric */
+int pdp_type_description_match(t_pdp_symbol *description, t_pdp_symbol *pattern)
+{
+    int retval = 0;
+
+    t_pdp_atom *ad, *ap;
+    t_pdp_symbol *wildcard = pdp_gensym("*");
+
+
+    if (!(pattern)) post("PANICA");
+    if (!(description)) post("PANICB");
+
+
+    /* same type -> match */
+    if (description == pattern) {retval = 1; goto done;}
+
+    /* use the description list stored in the symbol for comparison */
+    if (!(description->s_type)) _setup_type_cache(description);
+    if (!(pattern->s_type)) _setup_type_cache(pattern);
+
+    if (!(pattern->s_type)) post("PANIC1");
+    if (!(description->s_type)) post("PANIC2");
+
+    /* check size */
+    if (description->s_type->elements != pattern->s_type->elements){retval = 0;	goto done;}
+
+    /* compare symbols of type list */
+    for(ad=description->s_type->first, ap=pattern->s_type->first; ad; ad=ad->next, ap=ap->next){
+	if (ad->w.w_symbol == wildcard) continue;
+	if (ap->w.w_symbol == wildcard) continue;
+	if (ad->w.w_symbol != ap->w.w_symbol) {retval = 0; goto done;} /* difference and not a wildcard */
+    }
+
+    /* type templates match */
+    retval = 1;
+
+ done:
+    D post("DEBUG: testing match between %s and %s: %s", 
+	   description->s_name, pattern->s_name, retval ? "match" : "no match");
+    return retval;
+
+}
+
+
+
+
+
+/* setup method */
+void pdp_type_setup(void)
+{
+    int i;
+
+    // create mutexes
+    pthread_mutex_init(&pdp_hash_mutex, NULL);
+    pthread_mutex_init(&pdp_conversion_mutex, NULL);
+    pthread_mutex_init(&pdp_cache_mutex, NULL);
+
+    // init symbol hash
+    memset(pdp_symhash, 0, HASHSIZE * sizeof(t_pdp_symbol *));
+
+    // create conversion lists
+    cached_conversion_list = pdp_list_new(0);
+    conversion_list = pdp_list_new(0);
+    max_cache_size = INIT_MAX_CACHE_SIZE;
+
+
+
+
+}
diff --git a/system/kernel/pdp_type.c_old b/system/kernel/pdp_type.c_old
new file mode 100644
index 0000000..4e42d53
--- /dev/null
+++ b/system/kernel/pdp_type.c_old
@@ -0,0 +1,542 @@
+/*
+ *   Pure Data Packet system implementation. : code for handling different packet types
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+
+/* this file contains type handling routines 
+   note: pd symbols are used for type identification
+         for porting to other hosts, i suggest reimplementing t_pdp_symbol */
+
+// debug
+
+#include <fnmatch.h>
+#include <stdarg.h>
+#include <string.h>
+#include <pthread.h>
+#include "pdp.h"
+
+/*
+
+
+
+*/
+
+
+#define D if (0)
+
+
+static t_pdp_conversion *conversion_list;
+
+#define CACHE_SIZE 32
+static t_pdp_conversion *cached_conversion_list_start;
+static t_pdp_conversion cached_conversion_array[CACHE_SIZE];
+
+/* mutex */
+static pthread_mutex_t pdp_hash_mutex;
+static pthread_mutex_t pdp_conversion_mutex;
+static pthread_mutex_t pdp_cache_mutex;
+
+#define HASHSIZE 1024
+static t_pdp_symbol *pdp_symhash[HASHSIZE];
+
+
+/* shamelessly copied from pd src and made thread safe */
+t_pdp_symbol *_pdp_dogensym(char *s, t_pdp_symbol *oldsym)
+{
+    t_pdp_symbol **sym1, *sym2;
+    unsigned int hash1 = 0,  hash2 = 0;
+    int length = 0;
+    char *s2 = s;
+    while (*s2)
+    {
+        hash1 += *s2;
+        hash2 += hash1;
+        length++;
+        s2++;
+    }
+    sym1 = pdp_symhash + (hash2 & (HASHSIZE-1));
+
+    /* lock hash */
+    pthread_mutex_lock(&pdp_hash_mutex);
+
+    while (sym2 = *sym1)
+    {
+        if (!strcmp(sym2->s_name, s)) goto gotit;
+        sym1 = &sym2->s_next;
+    }
+    if (oldsym) sym2 = oldsym;
+    else
+    {
+        sym2 = (t_pdp_symbol *)pdp_alloc(sizeof(*sym2));
+        sym2->s_name = pdp_alloc(length+1);
+	_pdp_symbol_clear_namespaces(sym2);
+        sym2->s_next = 0;
+        strcpy(sym2->s_name, s);
+    }
+    *sym1 = sym2;
+
+ gotit:
+
+    /* unlock hash */
+    pthread_mutex_unlock(&pdp_hash_mutex);
+    return (sym2);
+}
+
+t_pdp_symbol *pdp_gensym(char *s)
+{
+    return(_pdp_dogensym(s, 0));
+}
+
+/* convert a type to a list */
+t_pdp_list *pdp_type_to_list(t_pdp_symbol *type)
+{
+    char *c = type->s_name;
+    char *lastname = c;
+    char tmp[100];
+    int n = 0;
+    t_pdp_list *l = pdp_list_new(0);
+
+    while(*c){
+	if (*c == '/'){
+	    strncpy(tmp, lastname, n);
+	    tmp[n] = 0;
+	    pdp_list_add_back(l, a_symbol, (t_pdp_word)pdp_gensym(tmp));
+	    c++;
+	    lastname = c;
+	    n = 0;
+	}
+	else{
+	    c++;
+	    n++;
+	}
+    }
+    pdp_list_add_back(l, a_symbol, (t_pdp_word)pdp_gensym(lastname));
+
+    return l;
+}
+
+
+/* get the description symbol. this includes some compat transition stuff with a warning */
+t_pdp_symbol *pdp_packet_get_description(int packet)
+{
+    t_pdp *header = pdp_packet_header(packet);
+
+    if (!header) return pdp_gensym("invalid");
+    else if (!header->desc){
+	/* if description is not defined, try to reconstruct it (for backwards compat) */
+	if (header->type == PDP_IMAGE){
+	    post("FIXME: pdp_type_get_description: packet %d has no description. using workaround.", packet);
+	    return pdp_packet_image_get_description(packet);
+	}
+	else 
+	    return pdp_gensym("unknown");
+    }
+    else return header->desc;
+}
+
+
+
+/* this runs a conversion program */
+int _pdp_type_run_conversion_program(t_pdp_conversion_program *program,
+	 			    int packet, t_pdp_symbol *dest_template)
+{
+    /* run a conversion program:
+       treat the source packet as readonly, and cleanup intermediates, such
+       that the net result is the production of a new packet, with the
+       source packet intact. */
+
+    int p, tmp;
+
+    D post("DEBUG: _pdp_type_run_conversion_program: program = %x", program); 
+
+    // run the first line of the program
+    D post("DEBUG: _pdp_type_run_conversion_program: method = %x", *program);
+    p = (*program->method)(packet, dest_template);
+    D post("DEBUG: _pdp_type_run_conversion_program: packet returned = %d, type = %s", p, pdp_packet_get_description(p)->s_name);
+
+    // run the remaining lines + cleanup intermediates
+    for (program = program->next; program ; program = program->next){
+	D post("DEBUG: _pdp_type_run_conversion_program: next method ptr = %x", *program->method);
+	tmp = (*program->method)(p, dest_template);
+	pdp_packet_mark_unused(p);
+	p = tmp;
+    }
+    return p;
+}
+
+
+/* find a conversion program */
+t_pdp_conversion_program *
+_pdp_type_find_conversion_program(t_pdp_symbol *src_pattern, t_pdp_symbol *dst_pattern)
+{
+    t_pdp_conversion *c;
+    t_pdp_conversion_program *retval = 0;
+
+    /* lock conversion list */
+    pthread_mutex_lock(&pdp_conversion_mutex);
+
+    for (c = conversion_list; c; c=c->next){
+	/* can be a wildcard match */
+	if (pdp_type_description_match(src_pattern, c->src_pattern) &&
+	    pdp_type_description_match(dst_pattern, c->dst_pattern)) {
+	    /* found a program */
+	    D post("DEBUG: _pdp_type_find_conversion_program: found: %s -> %s", c->src_pattern->s_name, c->dst_pattern->s_name);
+	    retval = c->program;
+	    goto gotit;
+	}
+    }
+
+    /* no conversion program was found */
+    retval = 0;
+ gotit:
+
+    /* lock conversion list */
+    pthread_mutex_unlock(&pdp_conversion_mutex);
+    return retval;
+}
+
+/* find a cached conversion program */
+t_pdp_conversion_program *
+_pdp_type_find_cached_conversion_program(t_pdp_symbol *src_pattern, t_pdp_symbol *dst_pattern)
+{
+    t_pdp_conversion *c;
+    t_pdp_conversion_program *retval = 0;
+
+    /* lock cached list */
+    pthread_mutex_lock(&pdp_cache_mutex);
+
+    for (c = cached_conversion_list_start; c; c=c->next){
+	/* must be exact match */
+	if ((src_pattern == c->src_pattern) &&
+	    (dst_pattern == c->dst_pattern)) {
+	    /* found a program */
+	    D post("DEBUG: _pdp_type_find_cached_conversion_program: found: %s -> %s", c->src_pattern->s_name, c->dst_pattern->s_name);
+	    retval = c->program;
+	    goto gotit;
+	}
+    }
+
+    retval = 0;
+
+ gotit:
+
+    /* un lock cached list */
+    pthread_mutex_unlock(&pdp_cache_mutex);
+
+    /* no conversion program was found */
+    return retval;
+}
+
+
+/* conversion program manipulations */
+void pdp_conversion_program_free(t_pdp_conversion_program *program)
+{
+    t_pdp_conversion_program *p = 0;
+    while (program) {
+	p = program;
+	program = program->next;
+	pdp_dealloc (p);
+    }
+}
+
+/* debug print */
+void _pdp_conversion_program_print(t_pdp_conversion_program *program)
+{
+    D post("DEBUG: conversion program: %x", program);
+    while(program){
+	D post("DEBUG: method: %x", program->method);
+	program = program->next;
+    }
+}
+
+t_pdp_conversion_program *pdp_conversion_program_new(t_pdp_conversion_method method, ...)
+{
+    t_pdp_conversion_program head;
+    t_pdp_conversion_program *p = &head;
+    t_pdp_conversion_method m = method;
+    va_list ap;
+
+    D post("DEBUG: pdp_conversion_program_new:BEGIN");
+
+    p = p->next = (t_pdp_conversion_program *)pdp_alloc(sizeof(*p));
+    p->method = m;
+    va_start(ap, method);
+    while (m = va_arg(ap, t_pdp_conversion_method)){
+	p = p->next = (t_pdp_conversion_program *)pdp_alloc(sizeof(*p));
+	p->method = m;
+    }
+    p->next = 0; // terminate list
+    va_end(ap);
+
+    D post("DEBUG: pdp_conversion_program_new:END");
+    D _pdp_conversion_program_print(head.next);
+
+    return head.next;
+}
+
+t_pdp_conversion_program *pdp_conversion_program_copy(t_pdp_conversion_program *program)
+{
+    t_pdp_conversion_program head;
+    t_pdp_conversion_program *p = &head;
+
+    for(;program; program=program->next){
+	p = p->next = (t_pdp_conversion_program *)pdp_alloc(sizeof(*p));
+	p->method = program->method;
+    }
+    p->next = 0;
+    return head.next;
+}
+
+void pdp_conversion_program_add(t_pdp_conversion_program *program, t_pdp_conversion_program *tail)
+{ 
+    t_pdp_conversion_program *p = program;
+
+    //D post("DEBUG: pdp_conversion_program_add:BEGIN");
+
+
+    while (p->next) p = p->next;
+    p->next = pdp_conversion_program_copy(tail);
+
+    //D post("DEBUG: pdp_conversion_program_add:END");
+    
+}
+
+/* conversion registration */
+void pdp_type_register_conversion (t_pdp_symbol *src_pattern, t_pdp_symbol *dst_pattern, t_pdp_conversion_program *program)
+{
+    t_pdp_conversion head;
+    t_pdp_conversion *c = &head;
+
+    /* lock conversion list */
+    pthread_mutex_lock(&pdp_conversion_mutex);
+
+    head.next = conversion_list;
+
+    while (c->next) c=c->next; // add a new one to the end
+    c = c->next = (t_pdp_conversion *)pdp_alloc(sizeof(*c));
+    c->src_pattern = src_pattern;
+    c->dst_pattern = dst_pattern;
+    c->program = program;
+    c->next = 0;
+    
+    conversion_list = head.next;
+
+    /* unlock conversion list */
+    pthread_mutex_unlock(&pdp_conversion_mutex);
+    
+}
+
+/* register a cached conversion */
+void pdp_type_register_cached_conversion (t_pdp_symbol *src_pattern, t_pdp_symbol *dst_pattern, t_pdp_conversion_program *program)
+{
+
+    t_pdp_conversion *save, *c, *c2;
+
+    /* unlock cahed conversion list */
+    pthread_mutex_lock(&pdp_cache_mutex);
+
+    c2 = save = cached_conversion_list_start;
+    while (c2->next->next) c2 = c2->next;
+    c = c2->next;
+    c2->next = 0;
+    if (c->program) pdp_conversion_program_free(c->program);
+    c->src_pattern = src_pattern;
+    c->dst_pattern = dst_pattern;
+    c->program = program;
+    c->next = save;
+    cached_conversion_list_start = c;
+
+    /* unlock cached conversion list */
+    pthread_mutex_unlock(&pdp_cache_mutex);
+}
+
+/* convert a given packet to a certain type (template) */
+int _pdp_packet_convert(int packet, t_pdp_symbol *dest_template)
+{
+    t_pdp_symbol *type = pdp_packet_get_description(packet);
+    t_pdp_symbol *tmp_type = 0;
+    int tmp_packet = -1;
+
+    t_pdp_conversion_program *program = 0;
+    t_pdp_conversion_program *program_last = 0;
+    t_pdp_conversion_program *program_tail = 0;
+
+    /* check if there is a program in the cached list, if so run it */
+    if (program = _pdp_type_find_cached_conversion_program(type, dest_template))
+	return _pdp_type_run_conversion_program(program, packet, dest_template);
+
+    /* if it is not cached, iteratively convert 
+       and save program on top of cache list if a conversion path (program) was found */
+
+    // run first conversion that matches
+    program = pdp_conversion_program_copy(_pdp_type_find_conversion_program(type, dest_template));
+    program_last = program;
+    if (!program){
+	D post("DEBUG: pdp_type_convert: (1) can't convert %s to %s", type->s_name, dest_template->s_name);
+	return -1;
+    }
+    tmp_packet = _pdp_type_run_conversion_program(program, packet, dest_template);
+    tmp_type = pdp_packet_get_description(tmp_packet);
+
+    // run more conversions if necessary, deleting intermediate packets
+    while (!pdp_type_description_match(tmp_type, dest_template)){
+	int new_packet;
+	program_tail = _pdp_type_find_conversion_program(tmp_type, dest_template);
+	if (!program_tail){
+	    D post("DEBUG: pdp_type_convert: (2) can't convert %s to %s", tmp_type->s_name, dest_template->s_name);
+	    pdp_packet_mark_unused(tmp_packet);
+	    pdp_conversion_program_free(program);
+	    return -1;
+	}
+	if (program_last == program_tail){
+	    post("ERROR: pdp_packet_convert: conversion loop detected");
+	}
+	program_last = program_tail;
+
+	pdp_conversion_program_add(program, program_tail);
+	new_packet = _pdp_type_run_conversion_program(program_tail, tmp_packet, dest_template);
+	pdp_packet_mark_unused(tmp_packet);
+	tmp_packet = new_packet;
+	tmp_type = pdp_packet_get_description(tmp_packet);
+    }
+
+    // save the conversion program
+    pdp_type_register_cached_conversion(type, dest_template, program);
+
+    // return resulting packet
+    return tmp_packet;
+	
+}
+
+/* convert or copy ro */
+int pdp_packet_convert_ro(int packet, t_pdp_symbol *dest_template)
+{
+    t_pdp_symbol *type = pdp_packet_get_description(packet);
+
+    /* if it is compatible, return a ro copy */
+    if (pdp_type_description_match(type, dest_template)) return pdp_packet_copy_ro(packet);
+
+    /* if not, convert to a new type */
+    else return _pdp_packet_convert(packet, dest_template);
+}
+
+/* convert or copy rw */
+int pdp_packet_convert_rw(int packet, t_pdp_symbol *dest_template)
+{
+    t_pdp_symbol *type = pdp_packet_get_description(packet);
+
+    /* if it is compatible, just return a rw copy */
+    if (pdp_type_description_match(type, dest_template)) return pdp_packet_copy_rw(packet);
+
+    /* if not, convert to a new type */
+    else return _pdp_packet_convert(packet, dest_template);
+}
+
+
+static void _setup_type_cache(t_pdp_symbol *s)
+{
+    t_pdp_list *l = pdp_type_to_list(s); 
+    pthread_mutex_lock(&pdp_hash_mutex); //lock to prevent re-entry
+    if (!s->s_type){
+	s->s_type = l;
+	l = 0;
+    }
+    pthread_mutex_unlock(&pdp_hash_mutex);
+    if (l) pdp_list_free(l);
+}
+
+/* check if a type description fits a template
+   this function is symmetric */
+int pdp_type_description_match(t_pdp_symbol *description, t_pdp_symbol *pattern)
+{
+
+
+#if 1
+    t_pdp_atom *ad, *ap;
+    t_pdp_symbol *wildcard = pdp_gensym("*");
+
+    /* same type -> match */
+    if (description == pattern) return 1;
+
+    /* use the description list stored in the symbol for comparison */
+    if (!(description->s_type)) _setup_type_cache(description);
+    if (!(pattern->s_type)) _setup_type_cache(pattern);
+
+    /* check size */
+    if (description->s_type->elements != pattern->s_type->elements) return 0;
+
+    /* compare symbols of type list */
+    for(ad=description->s_type->first, ap=pattern->s_type->first; ad; ad=ad->next, ap=ap->next){
+	if (ad->w.w_symbol == wildcard) continue;
+	if (ap->w.w_symbol == wildcard) continue;
+	if (ad->w.w_symbol != ap->w.w_symbol) return 0; /* difference and not a wildcard */
+    }
+
+    /* type templates match */
+    return 1;
+
+
+#else
+    int retval = 0;
+    if (description == pattern) retval = 1;
+    //else retval = (!fnmatch(pattern->s_name, description->s_name, FNM_FILE_NAME));
+
+    //hack: make a symmetric match symmetric by calling fnmatch a second time with reversed attributes
+    else retval = ((!fnmatch(pattern->s_name, description->s_name, FNM_FILE_NAME))
+		   ||(!fnmatch(description->s_name, pattern->s_name, FNM_FILE_NAME)));
+
+
+    D post("DEBUG: testing match between %s and %s: %s", description->s_name, pattern->s_name, retval ? "match" : "no match");
+
+    return retval;
+#endif
+}
+
+
+
+
+
+/* setup method */
+void pdp_type_setup(void)
+{
+    int i;
+
+    // create mutexes
+    pthread_mutex_init(&pdp_hash_mutex, NULL);
+    pthread_mutex_init(&pdp_conversion_mutex, NULL);
+    pthread_mutex_init(&pdp_cache_mutex, NULL);
+
+    // init hash
+    memset(pdp_symhash, 0, HASHSIZE * sizeof(t_pdp_symbol *));
+
+    // init conversion lists
+    conversion_list = 0;
+    for(i=0; i<CACHE_SIZE; i++){
+	t_pdp_conversion *c = cached_conversion_array + i;
+	c->src_pattern = 0;
+	c->dst_pattern = 0;
+	c->program = 0;
+	c->next = c + 1;
+    }
+    cached_conversion_list_start = cached_conversion_array;
+    cached_conversion_array[CACHE_SIZE-1].next = 0;
+
+
+
+}
diff --git a/system/kernel/pdp_ut.c b/system/kernel/pdp_ut.c
new file mode 100644
index 0000000..dadc493
--- /dev/null
+++ b/system/kernel/pdp_ut.c
@@ -0,0 +1,262 @@
+/*
+ *   Pure Data Packet - Utility toolkit objects.
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+
+/* This file contains some small utility pd objects that make working with 
+   pdp objects a lot easier. Mainly as glue to be used in the abstractions 
+   in the distro. */
+
+
+#include "pdp.h"
+#include <math.h>
+
+/* this object does an add, scale, clip operation */
+
+t_class *pdp_ut_addscaleclip_class;
+
+typedef struct pdp_ut_addscaleclip_struct
+{
+    t_object x_obj;
+    t_outlet *x_outlet0;
+    t_float x_min;
+    t_float x_max;
+    t_float x_offset;
+    t_float x_scale;
+} t_pdp_ut_addscaleclip;
+
+
+static void pdp_ut_addscaleclip_float(t_pdp_ut_addscaleclip *x, t_floatarg f)
+{
+    f += x->x_offset;
+    f *= x->x_scale;
+    f = (f < x->x_min) ? x->x_min : f;
+    f = (f > x->x_max) ? x->x_max : f;
+    outlet_float(x->x_outlet0, f);
+}
+
+static void pdp_ut_addscaleclip_free(t_pdp_ut_addscaleclip *x){}
+
+void *pdp_ut_addscaleclip_new(t_floatarg offset, t_floatarg scale, t_floatarg min, t_floatarg max)
+{
+    t_pdp_ut_addscaleclip *x = (t_pdp_ut_addscaleclip *)pd_new(pdp_ut_addscaleclip_class);
+    x->x_outlet0 = outlet_new(&x->x_obj, &s_float); 
+    x->x_offset = offset;
+    x->x_scale = scale;
+    x->x_min = min;
+    x->x_max = max;
+    return (void *)x;
+}
+
+void pdp_ut_addscaleclip_setup(void)
+{
+    pdp_ut_addscaleclip_class = class_new(gensym("pdp_ut_addscaleclip"), (t_newmethod)pdp_ut_addscaleclip_new,
+			      (t_method)pdp_ut_addscaleclip_free, sizeof(t_pdp_ut_addscaleclip), 0, 
+					 A_FLOAT, A_FLOAT, A_FLOAT, A_FLOAT, A_NULL);
+    class_addfloat(pdp_ut_addscaleclip_class,  pdp_ut_addscaleclip_float);
+}
+
+
+/* pdp_ut_logmap does a logarithmic parameter mapping [0->1] x -> min(max/min)^x max an add, scale, clip operation */
+/* pdp_ut_logmap_comp does x -> min(max/min)^(1-x) */
+/* pdp_ut_linmap dos x -> min + (max - min * x */
+
+t_class *pdp_ut_linmap_class;
+t_class *pdp_ut_logmap_class;
+t_class *pdp_ut_logmap_comp_class;
+
+typedef struct pdp_ut_map_struct
+{
+    t_object x_obj;
+    t_outlet *x_outlet0;
+    t_float x_min;
+    t_float x_max;
+} t_pdp_ut_map;
+
+
+static void pdp_ut_logmap_float(t_pdp_ut_map *x, t_floatarg f)
+{
+    f = (f < 0.0f) ? 0.0f : f;
+    f = (f > 1.0f) ? 1.0f : f;
+
+    f = x->x_min * pow((x->x_max / x->x_min), f);
+
+    outlet_float(x->x_outlet0, f);
+}
+
+static void pdp_ut_linmap_float(t_pdp_ut_map *x, t_floatarg f)
+{
+    f = (f < 0.0f) ? 0.0f : f;
+    f = (f > 1.0f) ? 1.0f : f;
+
+    f = x->x_min + ((x->x_max - x->x_min) * f);
+
+    outlet_float(x->x_outlet0, f);
+}
+
+static void pdp_ut_logmap_comp_float(t_pdp_ut_map *x, t_floatarg f)
+{
+    f = (f < 0.0f) ? 0.0f : f;
+    f = (f > 1.0f) ? 1.0f : f;
+
+    f = x->x_min * pow((x->x_max / x->x_min), (1.0f - f));
+
+    outlet_float(x->x_outlet0, f);
+}
+
+static void pdp_ut_map_free(t_pdp_ut_map *x){}
+
+
+void pdp_ut_map_init(t_pdp_ut_map *x, t_floatarg min, t_floatarg max)
+{
+    x->x_outlet0 = outlet_new(&x->x_obj, &s_float); 
+    x->x_min = min;
+    x->x_max = max;
+}
+
+void *pdp_ut_logmap_new(t_floatarg min, t_floatarg max)
+{
+    t_pdp_ut_map *x = (t_pdp_ut_map *)pd_new(pdp_ut_logmap_class);
+    pdp_ut_map_init(x, min, max);
+    return (void *)x;
+}
+
+void *pdp_ut_linmap_new(t_floatarg min, t_floatarg max)
+{
+    t_pdp_ut_map *x = (t_pdp_ut_map *)pd_new(pdp_ut_linmap_class);
+    pdp_ut_map_init(x, min, max);
+    return (void *)x;
+}
+
+void *pdp_ut_logmap_comp_new(t_floatarg min, t_floatarg max)
+{
+    t_pdp_ut_map *x = (t_pdp_ut_map *)pd_new(pdp_ut_logmap_comp_class);
+    pdp_ut_map_init(x, min, max);
+    return (void *)x;
+}
+
+void pdp_ut_logmap_setup(void)
+{
+    pdp_ut_logmap_class = class_new(gensym("pdp_ut_logmap"), (t_newmethod)pdp_ut_logmap_new,
+			      (t_method)pdp_ut_map_free, sizeof(t_pdp_ut_map), 0, 
+					 A_FLOAT, A_FLOAT, A_NULL);
+    class_addfloat(pdp_ut_logmap_class,  pdp_ut_logmap_float);
+}
+
+void pdp_ut_logmap_comp_setup(void)
+{
+    pdp_ut_logmap_comp_class = class_new(gensym("pdp_ut_logmap_comp"), (t_newmethod)pdp_ut_logmap_comp_new,
+			      (t_method)pdp_ut_map_free, sizeof(t_pdp_ut_map), 0, 
+					 A_FLOAT, A_FLOAT, A_NULL);
+    class_addfloat(pdp_ut_logmap_comp_class,  pdp_ut_logmap_comp_float);
+}
+
+void pdp_ut_linmap_setup(void)
+{
+    pdp_ut_linmap_class = class_new(gensym("pdp_ut_linmap"), (t_newmethod)pdp_ut_linmap_new,
+			      (t_method)pdp_ut_map_free, sizeof(t_pdp_ut_map), 0, 
+					 A_FLOAT, A_FLOAT, A_NULL);
+    class_addfloat(pdp_ut_linmap_class,  pdp_ut_linmap_float);
+}
+
+
+
+t_class *pdp_ut_rgb2ycrcb_class;
+
+typedef struct pdp_ut_rgb2ycrcb
+{
+    t_object x_obj;
+    t_outlet *x_outlet_luma;
+    t_outlet *x_outlet_chroma_red;
+    t_outlet *x_outlet_chroma_blue;
+
+    t_float x_red, x_green, x_blue;
+
+} t_pdp_ut_rgb2ycrcb;
+
+
+static void pdp_ut_rgb2ycrcb_bang  (t_pdp_ut_rgb2ycrcb* x)
+{
+
+    float luma = 0.299f * x->x_red + 0.587f * x->x_green + 0.114f * x->x_blue;
+    float chroma_red  = (x->x_red - luma) * 0.713f;
+    float chroma_blue = (x->x_blue - luma) * 0.565f;
+
+    outlet_float(x->x_outlet_chroma_blue, chroma_blue);
+    outlet_float(x->x_outlet_chroma_red, chroma_red);
+    outlet_float(x->x_outlet_luma, luma);
+
+}
+
+
+static void pdp_ut_rgb2ycrcb_red   (t_pdp_ut_rgb2ycrcb* x, t_floatarg f)   {x->x_red = f;   pdp_ut_rgb2ycrcb_bang(x);}
+static void pdp_ut_rgb2ycrcb_green (t_pdp_ut_rgb2ycrcb* x, t_floatarg f)   {x->x_green = f; pdp_ut_rgb2ycrcb_bang(x);}
+static void pdp_ut_rgb2ycrcb_blue  (t_pdp_ut_rgb2ycrcb* x, t_floatarg f)   {x->x_blue = f;  pdp_ut_rgb2ycrcb_bang(x);}
+
+
+
+static void pdp_ut_rgb2ycrcb_free  (t_pdp_ut_rgb2ycrcb* x)  {}
+static void* pdp_ut_rgb2ycrcb_new(void)
+{
+    t_pdp_ut_rgb2ycrcb *x = (t_pdp_ut_rgb2ycrcb *)pd_new(pdp_ut_rgb2ycrcb_class);
+
+
+    inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("green"));
+    inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("blue"));
+
+    x->x_outlet_luma        = outlet_new(&x->x_obj, &s_float); 
+    x->x_outlet_chroma_red  = outlet_new(&x->x_obj, &s_float); 
+    x->x_outlet_chroma_blue = outlet_new(&x->x_obj, &s_float); 
+
+    x->x_red = 0.0f;
+    x->x_green = 0.0f;
+    x->x_blue = 0.0f;
+
+
+    return (void *)x;
+}
+
+void pdp_ut_rgb2ycrcb_setup(void)
+{
+    pdp_ut_rgb2ycrcb_class = class_new(gensym("pdp_ut_rgb2ycrcb"), (t_newmethod)pdp_ut_rgb2ycrcb_new,
+			      (t_method)pdp_ut_rgb2ycrcb_free, sizeof(t_pdp_ut_rgb2ycrcb), 0, A_NULL);
+    class_addfloat(pdp_ut_rgb2ycrcb_class,  pdp_ut_rgb2ycrcb_red);
+    class_addmethod(pdp_ut_rgb2ycrcb_class,  (t_method)pdp_ut_rgb2ycrcb_green, gensym("green"), A_FLOAT, A_NULL);
+    class_addmethod(pdp_ut_rgb2ycrcb_class,  (t_method)pdp_ut_rgb2ycrcb_blue, gensym("blue"), A_FLOAT, A_NULL);
+}
+
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+void pdp_ut_setup(void)
+{
+    pdp_ut_addscaleclip_setup();
+    pdp_ut_logmap_setup();
+    pdp_ut_logmap_comp_setup();
+    pdp_ut_linmap_setup();
+    pdp_ut_rgb2ycrcb_setup();
+}
+
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/system/pdbase/Makefile b/system/pdbase/Makefile
new file mode 100644
index 0000000..58efa41
--- /dev/null
+++ b/system/pdbase/Makefile
@@ -0,0 +1,11 @@
+
+OBJECTS = pdp_base.o pdp_imagebase.o pdp_dpd_base.o
+
+
+include ../../Makefile.config
+
+all: $(OBJECTS)
+
+clean:
+	rm -f *~
+	rm -f *.o
diff --git a/system/pdbase/pdp_base.c b/system/pdbase/pdp_base.c
new file mode 100644
index 0000000..4d5593f
--- /dev/null
+++ b/system/pdbase/pdp_base.c
@@ -0,0 +1,415 @@
+/*
+ *   Pure Data Packet base class implementation.
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+
+/*
+
+  This file contains the pdp base class object.
+  This is really nothing more than an attempt to stay away from c++
+  as far as possible, while having some kind of base class functionality
+  for pdp (tucking away the communication & thread protocol).
+
+*/
+
+#include "pdp_base.h"
+#include <stdarg.h>
+
+
+static void pdp_base_debug(t_pdp_base *b, t_floatarg f)
+{
+    int i;
+    post("debug");
+    post("inlets: %d", b->b_inlets);
+    post("\tpacket\tnext_packet");
+    for (i=0; i<b->b_inlets; i++)
+	post("\t%d\t%d", b->b_packet[i], b->b_packet_next[i]);
+    //post("outlets: %d", b->b_inlets);
+}
+
+static void pdp_base_thread(t_pdp_base *b, t_floatarg f)
+{
+    int i = (int)f;
+    if ((i == 0) || (i == 1)) b->b_thread_enabled = i;
+}
+
+static void pdp_base_process(t_pdp_base *b)
+{
+
+    if (b->b_process_method)
+	(*b->b_process_method)(b);
+}
+
+/* this method is called after the thread has finished processing */
+static void pdp_base_postprocess(t_pdp_base *b)
+{
+    /* call the derived class postproc callback if there is any */
+    if (b->b_postproc_method)
+	(*b->b_postproc_method)(b);
+
+    /* unregister (mark unused) packet and propagate if packet is valid */
+    if (b->b_outlet[0])
+	pdp_pass_if_valid(b->b_outlet[0], &b->b_packet[0]);
+}
+
+
+/* move the passive packets in place */
+void pdp_base_movepassive(void *x)
+{
+    t_pdp_base *b = (t_pdp_base *)x;
+    int i;
+
+    /* if a cold packet was received in the meantime
+       swap it in, else keep the old one */
+    for (i=1; i<b->b_inlets; i++){
+	pdp_replace_if_valid(&b->b_packet[i], &b->b_packet_next[i]);
+    }
+    
+
+}
+
+/* the standard bang method */
+void pdp_base_bang(void *x)
+{
+    t_pdp_base *b = (t_pdp_base *)x;
+    int i;
+
+    /* if pdp thread is still processing, do nothing */
+    if (-1 != b->b_queue_id) return;
+
+    /* move packets in place */
+    pdp_base_movepassive(x);
+    
+
+    /* if there is a preproc method defined, call it inside
+       the pd thread. (mainly for allocations) */
+    if (b->b_preproc_method)
+	(*b->b_preproc_method)(b);
+
+    /* check if we need to use pdp queue */
+    if (b->b_thread_enabled){
+
+	/* add the process method and callback to the process queue */
+	pdp_procqueue_add(b->b_q, b, pdp_base_process, pdp_base_postprocess, &b->b_queue_id);
+    }
+    else{
+	/* call both methods directly */
+	pdp_base_process(b);
+	pdp_base_postprocess(b);
+    }
+}
+
+/* hot packet input handler */
+void pdp_base_input_hot(t_pdp_base *b, t_symbol *s, t_floatarg f)
+{
+
+    int p = (int)f;
+
+    /* dont register if active inlet is disabled */
+    if (!b->b_active_inlet_enabled) return;
+
+    /* register the packet (readonly or read/write)
+       or drop it if we have an active packet 
+       if type template is not null, packet will be converted */
+
+
+    if (b->b_active_inlet_readonly){
+	if (pdp_sym_rro() == s){
+	    if (b->b_type_template[0]){
+		pdp_packet_convert_ro_or_drop(&b->b_packet[0], p, b->b_type_template[0]);
+	    }
+	    else{
+		pdp_packet_copy_ro_or_drop(&b->b_packet[0], p);
+	    }
+	} 
+    }
+    else{
+	if (pdp_sym_rrw() == s) {
+	    if (b->b_type_template[0]){
+		pdp_packet_convert_rw_or_drop(&b->b_packet[0], p, b->b_type_template[0]);
+	    }
+	    else{
+		pdp_packet_copy_rw_or_drop(&b->b_packet[0], p);
+	    }
+	}
+    }
+
+    /* start processing if there is an active packet to process
+       and the processing method is not active */
+
+    if ((pdp_sym_prc() == s) && (-1 != b->b_packet[0]) && (-1 == b->b_queue_id)){
+	pdp_base_bang(b);
+    }
+    //if ((pdp_sym_prc() == s) && (-1 != b->b_packet[0]) && (!b->b_dropped))	pdp_base_bang(b);
+
+}
+
+/* cold packet input handlers */
+void pdp_base_input_cold(t_pdp_base *b, t_symbol *s, int ac, t_atom *av)
+{
+
+    int p;
+    int i;
+    char msg[] = "pdp1";
+    char *c;
+
+    int inlet;
+
+    //post("pdp_base_input_cold: got packet");
+
+    /* do cheap tests first */
+    if (ac != 2) return;
+    if (av[0].a_type != A_SYMBOL) return;
+    if (av[0].a_w.w_symbol != pdp_sym_rro()) return;
+    if (av[1].a_type != A_FLOAT) return;
+    p = (int)av[1].a_w.w_float;
+
+
+    /* check if it's a pdp message
+       and determine inlet */
+    for (i=1; i<MAX_NB_PDP_BASE_INLETS; i++){
+	if (s == gensym(msg)){
+	    inlet = i;
+	    goto found;
+	}
+	else{
+	    msg[3]++;
+	}
+    }
+    return;
+    
+
+ found:
+
+    /* store the packet and trow away 
+       the old one, if there is any */
+
+    pdp_packet_copy_ro_or_drop(&b->b_packet_next[inlet], p);
+}
+
+
+void pdp_base_set_process_method(void *x, t_pdp_method m)
+{
+    t_pdp_base *b = (t_pdp_base *)x;
+    b->b_process_method = m;
+}
+
+void pdp_base_set_preproc_method(void *x, t_pdp_method m)
+{
+    t_pdp_base *b = (t_pdp_base *)x;
+    b->b_preproc_method = m;
+}
+
+
+void pdp_base_set_postproc_method(void *x, t_pdp_method m)
+{
+    t_pdp_base *b = (t_pdp_base *)x;
+    b->b_postproc_method = m;
+}
+
+
+void pdp_base_queue_wait(void *x)
+{
+    t_pdp_base *b = (t_pdp_base *)x;
+    pdp_procqueue_wait(b->b_q);
+}
+
+void pdp_base_set_queue(void *x, t_pdp_procqueue *q)
+{
+    t_pdp_base *b = (t_pdp_base *)x;
+    pdp_base_queue_wait(x);
+    b->b_q = q;
+}
+
+t_pdp_procqueue *pdp_base_get_queue(void *x)
+{
+    t_pdp_base *b = (t_pdp_base *)x;
+    return b->b_q;
+}
+
+void pdp_base_setup(t_class *c)
+{
+
+     /* add pdp base class methods */
+    class_addmethod(c, (t_method)pdp_base_thread, gensym("thread"), A_FLOAT, A_NULL);
+    class_addmethod(c, (t_method)pdp_base_debug, gensym("debug"), A_NULL);
+
+    /* hot packet handler */
+    class_addmethod(c, (t_method)pdp_base_input_hot, gensym("pdp"),  A_SYMBOL, A_DEFFLOAT, A_NULL);
+
+    /* cold packet handler */
+    class_addanything(c, (t_method)pdp_base_input_cold);
+}
+
+/* pdp base instance constructor */
+void pdp_base_init(void *x)
+{
+    int i;
+    t_pdp_base *b = (t_pdp_base *)x;
+
+    b->b_channel_mask = -1;
+
+    for(i=0; i<MAX_NB_PDP_BASE_INLETS; i++){
+	b->b_packet[i] = -1;
+	b->b_packet_next[i] = -1;
+	b->b_type_template[i] = 0;
+    } 
+
+    b->b_queue_id = -1;
+    //b->b_dropped = 0;
+    b->b_process_method = 0;
+    b->b_preproc_method = 0;
+    b->b_inlets = 1;
+    b->b_outlets = 0;
+    b->b_active_inlet_enabled = 1;
+    b->b_active_inlet_readonly = 0;
+    b->b_thread_enabled = 1;
+
+    // default queue is pdp queue
+    b->b_q = pdp_queue_get_queue();
+
+}
+
+/* base instance destructor */
+void pdp_base_free(void *x)
+{
+    int i;
+    t_pdp_base *b = (t_pdp_base *)x;
+    /* remove process method from queue before deleting data */
+    pdp_procqueue_finish(b->b_q, b->b_queue_id);
+
+    /* delete stuff */
+    for(i=0; i<MAX_NB_PDP_BASE_INLETS; i++){
+	pdp_packet_mark_unused(b->b_packet[i]);
+	pdp_packet_mark_unused(b->b_packet_next[i]);
+    } 
+
+}
+
+void pdp_base_readonly_active_inlet(void *x)
+{
+    t_pdp_base *b = (t_pdp_base *)x;
+    b->b_active_inlet_readonly = 1;
+}
+
+void pdp_base_disable_active_inlet(void *x)
+{
+    t_pdp_base *b = (t_pdp_base *)x;
+    b->b_active_inlet_enabled = 0;
+}
+
+
+/* add an inlet */
+void pdp_base_add_pdp_inlet(void *x)
+{
+    t_pdp_base *b = (t_pdp_base *)x;
+    char s[] = "pdp0";
+    s[3] += b->b_inlets;
+
+    if (b->b_inlets < MAX_NB_PDP_BASE_INLETS){
+	inlet_new(&b->x_obj, &b->x_obj.ob_pd, gensym("pdp"), gensym(s));
+	b->b_inlets++;
+    }
+    else {
+	post("pdp_base_add_pdp_inlet: only %d pdp inlets allowed. ignoring.", MAX_NB_PDP_BASE_INLETS);
+    }
+}
+
+
+/* add an outlet: only one allowed */
+t_outlet *pdp_base_add_pdp_outlet(void *x)
+{
+    t_pdp_base *b = (t_pdp_base *)x;
+    t_outlet *outlet =  outlet_new(&b->x_obj, &s_anything);
+
+    
+    if (b->b_outlets < MAX_NB_PDP_BASE_OUTLETS){
+	b->b_outlet[b->b_outlets] = outlet; 
+	b->b_outlets++;
+    }
+
+    return outlet;
+
+}
+
+void pdp_base_set_packet(void *x, int inlet, int packet)
+{
+    t_pdp_base *b = (t_pdp_base *)x;
+
+    if (inlet < b->b_inlets){
+	//post("%d %d", b->b_packet[inlet], b->b_packet_next[inlet]);
+	pdp_packet_mark_unused(b->b_packet[inlet]);
+	b->b_packet[inlet] = packet;
+    }
+} 
+
+
+int pdp_base_get_packet(void *x, int inlet)
+{
+    t_pdp_base *b = (t_pdp_base *)x;
+
+    if (inlet < b->b_inlets){
+	//post("%d %d", b->b_packet[inlet], b->b_packet_next[inlet]);
+	return (b->b_packet[inlet]);
+    }
+
+    return -1;
+} 
+
+int pdp_base_move_packet(void *x, int inlet)
+{
+    t_pdp_base *b = (t_pdp_base *)x;
+    int p;
+
+    if (inlet < b->b_inlets){
+	p = b->b_packet[inlet];
+	b->b_packet[inlet] = -1;
+	return (p);
+    }
+
+    return -1;
+} 
+
+
+
+t_object *pdp_base_get_object(void *x)
+{
+    return (t_object *)x;
+}
+
+void pdp_base_add_gen_inlet(void *x, t_symbol *from, t_symbol *to)
+{
+    t_object *o = (t_object *)x;
+    inlet_new(o, &o->ob_pd, from, to);
+}
+
+void pdp_base_disable_thread(void *x)
+{
+    
+    t_pdp_base *b = (t_pdp_base *)x;
+    b->b_thread_enabled = 0;
+}
+
+void pdp_base_set_type_template(void *x, int inlet, t_pdp_symbol *type_template)
+{
+    t_pdp_base *b = (t_pdp_base *)x;
+    if (inlet < b->b_inlets){
+	b->b_type_template[inlet] = type_template;
+    }
+}
diff --git a/system/pdbase/pdp_dpd_base.c b/system/pdbase/pdp_dpd_base.c
new file mode 100644
index 0000000..162368d
--- /dev/null
+++ b/system/pdbase/pdp_dpd_base.c
@@ -0,0 +1,270 @@
+/*
+ *   Pure Data Packet module. DPD base class implementation.
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+
+#include "pdp_dpd_base.h"
+#include "pdp_internals.h"
+
+
+#define THIS(b) t_pdp_dpd_base *b = (t_pdp_dpd_base *)x
+
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+
+
+/* PRIVATE METHODS */
+
+
+
+
+/* dpd packet context input handler */
+static void _pdp_dpd_base_context_input(t_pdp_dpd_base *b, t_symbol *s, t_floatarg f)
+{
+
+    int p = (int)f;
+    int i;
+
+    //post ("pdp_dpd_base_context_input: got %s %d", s->s_name, p);
+
+    /* sources/sinks have active inlet disabled */
+    if (b->b_dpd_active_inlet_disabled) return;
+
+    /* handle inspect message */
+    if (pdp_sym_ins() == s){
+
+	/* store packet for inspector */
+	b->b_context_packet = p;
+
+      	/* add inspector to pdp queue
+	   this is special: it doesn't use a command object */
+	pdp_dpd_base_queue_command(b, b, b->b_inspector_method, b->b_inspector_callback, 0);
+    }
+
+    /* handle accumulate message */
+    if (pdp_sym_acc() == s){
+
+	/* store context for accumulator methods */
+	b->b_context_packet = p;
+
+	/* call bang */
+	pdp_dpd_base_bang(b);
+
+
+    }
+
+}
+
+/* default command object (returns self) */
+void *_pdp_dpd_base_get_command_object(void *x){return x;}
+
+/* PUBLIC METHODS */
+
+
+void pdp_dpd_base_queue_command(void *x, void *c, t_pdp_method process, 
+				t_pdp_method callback, int *id)
+{
+    THIS(b);
+    t_pdp_procqueue *q = pdp_base_get_queue(x);
+    pdp_procqueue_add(q, c, process, callback, id);
+    
+}
+
+/* bang method (propagate context to outlet) : it is not registered as a pd message by default ! */
+void pdp_dpd_base_bang(void *x)
+{
+    THIS(b);
+    int i, id;
+    void *cobj;
+
+    /* move passive pdp packets in place */
+    pdp_base_movepassive(x);
+    
+    /* get command object (or use self) */
+    cobj = b->b_command_factory_method ? (b->b_command_factory_method)(b) : b;
+    //post(" command object is %x. object is %x", cobj, b);
+
+
+    /* queue acc method & propagate for all outlets */
+    for (i=b->b_nb_context_outlets; i--;){
+
+	
+	/* propagate the context packet to the outlet */
+	if (b->b_outlet_enable[i]){
+	    pdp_dpd_base_queue_command(x, cobj, b->b_accum_method[i], b->b_accum_callback[i], 0);
+	    outlet_dpd(b->b_context_outlet[i], b->b_context_packet);
+	}
+	else{
+	    //post("outlet %d disabled", i);
+	}
+    }
+
+    /* queue cleanup method */
+    if (b->b_cleanup_method)
+	//pdp_procqueue_add(b->b_q, b, b->b_cleanup_method, 0, &b->b_cleanup_queue_id);
+	pdp_dpd_base_queue_command(x, cobj, b->b_cleanup_method, b->b_cleanup_callback, 0);
+
+    /* send communication complete notify */
+    if (b->b_complete_notify)
+	(b->b_complete_notify)(x);
+
+}
+
+/* get/set context packet */
+int pdp_dpd_base_get_context_packet(void *x){
+    THIS(b);
+    return b->b_context_packet;
+}
+int pdp_dpd_base_move_context_packet(void *x){
+    THIS(b);
+    int p =  b->b_context_packet;
+    b->b_context_packet = -1;
+    return p;
+}
+
+void pdp_dpd_base_set_context_packet(void *x, int p){
+    THIS(b);
+    pdp_packet_mark_unused(b->b_context_packet);
+    b->b_context_packet = p;
+}
+
+/* add a cleanup callback (called after all propagation is finished) for sources/sinks */
+void pdp_dpd_base_add_cleanup(void *x, t_pdp_method cleanup_method, t_pdp_method cleanup_callback)
+{
+    THIS(b);
+    b->b_cleanup_method = cleanup_method;
+    b->b_cleanup_callback = cleanup_callback;
+    //b->b_cleanup_queue_id = -1;
+}
+
+/* add a inspector callback */
+void pdp_dpd_base_add_inspector(void *x, t_pdp_method inspector_method)
+{
+    THIS(b);
+    b->b_inspector_method = inspector_method;
+    //b->b_inspector_queue_id = -1;
+}
+
+/* add a context outlet */
+t_outlet *pdp_dpd_base_add_outlet(void *x, t_pdp_method accum_method, t_pdp_method accum_callback)
+{
+    THIS(b);
+    int i = b->b_nb_context_outlets;
+    if (i < PDP_DPD_MAX_CONTEXT_OUTLETS){
+	b->b_context_outlet[i] = outlet_new((t_object *)b, &s_anything);
+	b->b_outlet_enable[i] = 1;
+	b->b_accum_method[i] = accum_method;
+	b->b_accum_callback[i] = accum_callback;
+	//b->b_accum_queue_id[i] = -1;
+	b->b_nb_context_outlets++;
+	return b->b_context_outlet[i];
+    }
+    else{
+	post("pdp_dpd_base_add_outlet: no more free outlet slots");
+	return 0;
+    }
+
+}
+
+
+/* destructor */
+void pdp_dpd_base_free(void *x)
+{
+    THIS(b);
+
+    /* free base */
+    pdp_base_free(b);
+}
+
+
+void pdp_dpd_base_disable_active_inlet(void *x)
+{
+    THIS(b);
+    b->b_dpd_active_inlet_disabled = 1;
+}
+
+
+
+void pdp_dpd_base_enable_outlet(void *x, int outlet, int toggle)
+{
+    THIS(b);
+    if (outlet >=0 && outlet < PDP_DPD_MAX_CONTEXT_OUTLETS){
+	b->b_outlet_enable[outlet] = toggle;
+    }
+	
+}
+
+
+void pdp_dpd_base_register_complete_notify(void *x, t_pdp_method method)
+{
+    THIS(b);
+    b->b_complete_notify = method;
+}
+
+void pdp_dpd_base_register_command_factory_method(void *x, t_pdp_newmethod command_factory_method)
+{
+    THIS(b);
+    b->b_command_factory_method = command_factory_method;
+}
+
+
+/* init method */
+void pdp_dpd_base_init(void *x)
+{
+    THIS(b);
+
+    /* super init */
+    pdp_base_init(b);
+
+    /* disable pdp messages on active inlet (dpd messages are used as sync) */
+    pdp_base_disable_active_inlet(b);
+
+    /* init data */
+    b->b_nb_context_outlets = 0;
+    b->b_context_packet = -1;
+    b->b_cleanup_method = 0;
+    //b->b_cleanup_queue_id = -1;
+    b->b_inspector_method = 0;
+    //b->b_inspector_queue_id = -1;
+    b->b_dpd_active_inlet_disabled = 0;
+
+    // default notify == none
+    b->b_complete_notify = 0;
+
+    // default command object getter
+    b->b_command_factory_method = 0;
+
+}
+
+
+void pdp_dpd_base_setup(t_class *class)
+{
+
+    pdp_base_setup(class);
+    class_addmethod(class, (t_method)_pdp_dpd_base_context_input, gensym("dpd"), A_SYMBOL, A_FLOAT, A_NULL);
+
+}
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/system/pdbase/pdp_imagebase.c b/system/pdbase/pdp_imagebase.c
new file mode 100644
index 0000000..f9634e1
--- /dev/null
+++ b/system/pdbase/pdp_imagebase.c
@@ -0,0 +1,79 @@
+/*
+ *   Pure Data Packet image processor base class implementation.
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+
+/*
+
+  This file contains the pdp image base class object.
+*/
+
+#include "pdp_imagebase.h"
+#include <stdarg.h>
+
+
+static void pdp_imagebase_chanmask(t_pdp_base *b, t_floatarg f)
+{
+    int i = (int)f;
+    if (i < 0) i = -1;
+    b->b_channel_mask = i;
+}
+
+void pdp_imagebase_setup(t_class *c)
+{
+    /* parent class setup */
+    pdp_base_setup(c);
+
+     /* add pdp base class methods */
+    class_addmethod(c, (t_method)pdp_imagebase_chanmask, gensym("chanmask"), A_FLOAT, A_NULL);
+
+}
+
+/* pdp base instance constructor */
+void pdp_imagebase_init(void *x)
+{
+    int i;
+    t_pdp_imagebase *b = (t_pdp_imagebase *)x;
+
+    /* init super */
+    pdp_base_init(x);
+
+    /* convert all active incoming packet types to image */
+    pdp_base_set_type_template(x, 0, pdp_gensym("image/*/*"));
+
+    /* default chanmask == all */
+    b->b_channel_mask = -1;
+
+}
+
+/* base instance destructor */
+void pdp_imagebase_free(void *x)
+{
+    /* free super */
+    pdp_base_free(x);
+
+}
+
+/* chanmask getter */
+u32 pdp_imagebase_get_chanmask(void *x)
+{
+    t_pdp_base *b = (t_pdp_base *)x;
+    return b->b_channel_mask;
+}
+
diff --git a/system/png/Makefile b/system/png/Makefile
new file mode 100644
index 0000000..9122da6
--- /dev/null
+++ b/system/png/Makefile
@@ -0,0 +1,11 @@
+
+OBJECTS = pdp_png.o
+
+
+include ../../Makefile.config
+
+all: $(OBJECTS)
+
+clean:
+	rm -f *~
+	rm -f *.o
diff --git a/system/png/pdp_png.c b/system/png/pdp_png.c
new file mode 100644
index 0000000..573d42c
--- /dev/null
+++ b/system/png/pdp_png.c
@@ -0,0 +1,405 @@
+
+/*
+ *   Pure Data Packet system module. - png glue code
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include "pdp.h"
+
+// this is an optional module
+#include "pdp_config.h" 
+
+
+#ifdef HAVE_PDP_PNG
+//if 0
+
+#include <png.h>
+
+#define READING 1
+#define WRITING 2
+#define SIG_BYTES 8
+
+#define D if(0)
+
+typedef struct
+{
+    FILE *x_fp;
+
+    int x_kindof; //READING or WRITING
+    png_structp x_png;
+    png_infop x_info;
+    png_infop x_end_info;
+
+    png_uint_32 x_width;
+    png_uint_32 x_height;
+    int x_bit_depth;
+    int x_color_type;
+    int x_interlace_type;
+    int x_compression_type;
+    int x_filter_type;
+
+    int x_pdp_bitmap_type;
+    int x_packet;
+
+} t_png_image;
+
+static t_png_image *_init(t_png_image *x)
+{
+    x->x_png = 0;
+    x->x_info = 0;
+    x->x_end_info = 0;
+    x->x_fp = 0;
+    x->x_packet = -1;
+    return x;
+}
+
+static int _cleanup(t_png_image *x)
+{
+    if (!x) return 1;
+    pdp_packet_mark_unused(x->x_packet);
+    if (x->x_png)
+	switch(x->x_kindof){
+	case READING: png_destroy_read_struct(&x->x_png, &x->x_info, &x->x_end_info); break;
+	case WRITING: png_destroy_write_struct(&x->x_png, &x->x_info); break;
+	default: exit(1);
+	}
+    if (x->x_fp) fclose(x->x_fp);
+    return 1;
+}
+
+static int _open_read(t_png_image* x, char *file)
+{
+    char header[SIG_BYTES];
+    int is_png;
+
+    x->x_fp = fopen(file, "r");
+    if (!x->x_fp) {
+	D post("can't open %s for reading", file);
+	return 0;
+    }
+    fread(header, 1, SIG_BYTES, x->x_fp);
+    is_png = !png_sig_cmp(header, 0, SIG_BYTES);
+
+    D post("%s is %s png file", file, is_png ? "a" : "not a");
+
+    return is_png;
+}
+
+static int _open_write(t_png_image* x, char *file)
+{
+    char header[SIG_BYTES];
+    int is_png;
+
+    x->x_fp = fopen(file, "w");
+    if (!x->x_fp) {
+	D post("can't open %s for writing", file);
+	return 0;
+    }
+
+    return 1;
+}
+
+/* progress callback */
+
+static void _row_callback(png_structp p, png_uint_32 row, int pass)
+{
+    fprintf(stderr, ".");
+}
+
+static int _initio_read(t_png_image *x)
+{
+    png_init_io(x->x_png, x->x_fp);
+    png_set_sig_bytes(x->x_png, SIG_BYTES);
+    D png_set_read_status_fn(x->x_png, _row_callback);
+    return 1;
+
+}
+
+static int _initio_write(t_png_image *x)
+{
+    png_init_io(x->x_png, x->x_fp);
+    D png_set_write_status_fn(x->x_png, _row_callback);
+
+    return 1;
+
+}
+
+static int _checkimagetype(t_png_image *x)
+{
+    png_read_info(x->x_png, x->x_info);
+    png_get_IHDR(x->x_png, x->x_info, &x->x_width, &x->x_height,
+       &x->x_bit_depth, &x->x_color_type, &x->x_interlace_type, 
+		 &x->x_compression_type, &x->x_filter_type);
+
+    D post("image info: w=%d, h=%d, depth=%d, type=%d",
+	     (int)x->x_width, (int)x->x_height, (int)x->x_bit_depth, 
+	     (int)x->x_color_type);
+
+
+    /* handle paletted images: convert to 8 bit RGB(A) */
+    if (x->x_color_type == PNG_COLOR_TYPE_PALETTE &&
+        x->x_bit_depth <= 8) {
+	png_set_expand(x->x_png);
+	D post("convert palette");
+
+	/* check if there's an alpha channel and set PDP_BITMAP type */
+	x->x_pdp_bitmap_type = 
+	    (png_get_valid(x->x_png, x->x_info, PNG_INFO_tRNS)) ?
+	    PDP_BITMAP_RGBA : PDP_BITMAP_RGB;
+
+	return 1;
+    }
+
+    /* handle bitdepth */
+    if (x->x_bit_depth < 8) {
+	png_set_expand(x->x_png);
+	D post("convert greyscale to 8 bit");
+    }
+    if (x->x_bit_depth == 16){
+	D post("stripping 16 bit to 8 bit");
+	png_set_strip_16(x->x_png);
+    }
+
+
+    /* handle greyscale images */
+    if (x->x_color_type == PNG_COLOR_TYPE_GRAY){
+	x->x_pdp_bitmap_type = PDP_BITMAP_GREY;
+	if (png_get_valid(x->x_png, x->x_info, PNG_INFO_tRNS)){
+	    D post("no support for greyscale images with alpha info");
+	    return 0;
+	}
+	return 1;
+    }
+
+    /* handle RGB imges */
+    if (x->x_color_type = PNG_COLOR_TYPE_RGB){
+	x->x_pdp_bitmap_type = PDP_BITMAP_RGB;
+	return 1;
+    }
+
+    /* handle RGBA imges */
+    if (x->x_color_type = PNG_COLOR_TYPE_RGBA){
+	x->x_pdp_bitmap_type = PDP_BITMAP_RGBA;
+	return 1;
+    }
+
+    
+    /* can't handle image type */
+    D post("image type not supported");
+    return 0;
+
+}
+
+#define user_error_ptr NULL
+#define user_error_fn NULL
+#define user_warning_fn NULL
+
+static int _buildstruct_read(t_png_image *x)
+{
+    x->x_kindof = READING;
+
+    if (!(x->x_png = png_create_read_struct
+	(PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
+	 user_error_fn, user_warning_fn))) return 0;
+
+    if (!(x->x_info = png_create_info_struct(x->x_png))) return 0;
+    if (!(x->x_end_info = png_create_info_struct(x->x_png))) return 0;
+
+    return 1;
+}
+
+static int _buildstruct_write(t_png_image *x)
+{
+    x->x_kindof = WRITING;
+
+    if (!(x->x_png = png_create_write_struct
+	(PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
+	 user_error_fn, user_warning_fn))) return 0;
+
+    if (!(x->x_info = png_create_info_struct(x->x_png))) return 0;
+
+    return 1;
+}
+
+static int _getimagedata(t_png_image *x)
+{
+    int nbchans = 0;
+    char *image_data;
+    png_bytep row_pointers[x->x_height];
+    png_uint_32 i;
+
+    D post("reading %d rows ", (int)x->x_height);
+
+    switch (x->x_pdp_bitmap_type){
+    case PDP_BITMAP_GREY: nbchans = 1; break;
+    case PDP_BITMAP_RGB:  nbchans = 3; break;
+    case PDP_BITMAP_RGBA: nbchans = 4; break;
+    default:
+	return 0;
+    }
+
+    x->x_packet = 
+	pdp_packet_new_bitmap(x->x_pdp_bitmap_type, x->x_width, x->x_height);
+    if (!(image_data = pdp_packet_data(x->x_packet))) return 0;
+
+    for(i=0; i<x->x_height; i++)
+	row_pointers[i] = image_data + nbchans * i * x->x_width;
+
+    png_read_image(x->x_png, row_pointers);
+
+    D post("DONE");
+
+    return 1;
+}
+
+static int _saveimagedata(t_png_image *x, int packet)
+{
+    png_bytep *row_pointers;
+    png_uint_32 i;
+    int nbchans;
+    t_pdp *h = pdp_packet_header(packet);
+    char *image_data = (char *)pdp_packet_data(packet);
+
+    if (!h) return 0;
+    if (PDP_BITMAP != h->type) return 0;
+    if (!image_data) return 0;
+
+    x->x_width = h->info.bitmap.width;
+    x->x_height = h->info.bitmap.height;
+
+    switch(h->info.image.encoding){
+    case PDP_BITMAP_GREY: x->x_color_type = PNG_COLOR_TYPE_GRAY; nbchans = 1; break;
+    case PDP_BITMAP_RGB:  x->x_color_type = PNG_COLOR_TYPE_RGB;  nbchans = 3; break;
+    case PDP_BITMAP_RGBA: x->x_color_type = PNG_COLOR_TYPE_RGBA; nbchans = 4; break;
+    default: return 0;
+    }
+								     
+    png_set_IHDR(x->x_png, x->x_info, x->x_width, x->x_height, 8,
+		 x->x_color_type, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
+		 PNG_FILTER_TYPE_DEFAULT);
+
+    png_write_info(x->x_png, x->x_info);
+
+    D post("writing %d rows ", (int)x->x_height);
+
+    row_pointers = (png_bytep *)pdp_alloc(sizeof(png_bytep) * x->x_height);
+    for(i=0; i<x->x_height; i++)
+	row_pointers[i] = image_data + nbchans * i * x->x_width;
+
+    png_write_image(x->x_png, row_pointers);
+    png_write_end(x->x_png, x->x_info);
+    pdp_dealloc(row_pointers);
+
+    D post("DONE");
+
+    return 1;
+}
+
+
+
+/* simple functions to load and save png images */
+
+int pdp_packet_bitmap_from_png_file(char *filename)
+{
+    int packet = -1;
+    t_png_image _x;
+    t_png_image *x = &_x;
+
+    if (!_init(x)) goto exit;
+    if (!_open_read(x, filename)) goto exit;
+    if (!_buildstruct_read(x)) goto exit;
+    if (!_initio_read(x)) goto exit;
+    if (!_checkimagetype(x)) goto exit;
+    if (!_getimagedata(x)) goto exit;
+
+    packet = x->x_packet;
+    x->x_packet = -1;
+    _cleanup(x);
+    return packet;
+ exit:
+    _cleanup(x);
+    return -1;
+
+}
+
+
+
+int pdp_packet_bitmap_save_png_file(int packet, char *filename)
+{
+
+    t_png_image _x;
+    t_png_image *x = &_x;
+
+    if (!_init(x)) goto exit;
+    if (!_open_write(x, filename)) goto exit;
+    if (!_buildstruct_write(x)) goto exit;
+    if (!_initio_write(x)) goto exit;
+    if (!_saveimagedata(x, packet)) goto exit;
+
+    _cleanup(x);
+    return 1;
+ exit:
+    _cleanup(x);
+    return 0;
+
+}
+
+
+
+#else //PDP_HAVE_PNG
+int pdp_packet_bitmap_save_png_file(int packet, char *filename)
+{
+    post("WARNING: no png support, can't save png file %s", filename);
+    return 0;
+}
+
+int pdp_packet_bitmap_from_png_file(char *filename)
+{
+    post("WARNING: no png support, can't load png file %s", filename);
+    return -1;
+}
+
+
+#endif //PDP_HAVE_PNG
+
+
+
+
+
+
+
+
+
+
+
+
+
+#if 0
+int main(int argc, char **argv)
+{
+    char *image = 0;
+
+    if (argc != 2) 
+	post("usage: %s <png file>", argv[0]);
+    else
+	image = load_png(argv[1]);
+
+    post ("%s", image ? "OK" : "ERROR");
+
+}
+#endif
diff --git a/system/type/Makefile b/system/type/Makefile
new file mode 100644
index 0000000..04f37a8
--- /dev/null
+++ b/system/type/Makefile
@@ -0,0 +1,11 @@
+
+OBJECTS = pdp_bitmap.o pdp_image.o pdp_image_words.o pdp_matrix.o
+
+
+include ../../Makefile.config
+
+all: $(OBJECTS)
+
+clean:
+	rm -f *~
+	rm -f *.o
diff --git a/system/type/pdp_bitmap.c b/system/type/pdp_bitmap.c
new file mode 100644
index 0000000..7b093aa
--- /dev/null
+++ b/system/type/pdp_bitmap.c
@@ -0,0 +1,583 @@
+/*
+ *   Pure Data Packet system implementation. : 8 bit image packet implementation
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include "pdp.h"
+#include "pdp_internals.h"
+#include <stdio.h>
+
+
+/* the class object */
+static t_pdp_class* bitmap_class;
+
+
+t_bitmap *pdp_packet_bitmap_info(int packet)
+{
+    return (t_bitmap *)pdp_packet_subheader(packet);
+}
+
+/* check if packet is a valid image packet */
+int pdp_packet_bitmap_isvalid(int packet)
+{
+    t_pdp *header = pdp_packet_header(packet);
+    t_bitmap *image = pdp_packet_bitmap_info(packet);
+    if (!header) return 0;
+    if (PDP_BITMAP != header->type) return 0;
+
+    return 1;
+
+}
+
+
+
+/* bitmap constructors */
+t_pdp_symbol *pdp_packet_bitmap_get_description(int packet)
+{
+    t_pdp *header = pdp_packet_header(packet);
+    t_bitmap *bitmap = pdp_packet_bitmap_info(packet);
+    char description[1024];
+    char *c = description;
+    int encoding;
+
+    if (!header) return pdp_gensym("invalid");
+    else if (!header->desc){
+	/* if description is not defined, try to reconstruct it (for backwards compat) */
+	if (header->type == PDP_BITMAP){
+	    c += sprintf(c, "bitmap");
+	    encoding = bitmap->encoding;
+	    switch(encoding){
+	    case PDP_BITMAP_RGB: c += sprintf(c, "/rgb"); break;
+	    case PDP_BITMAP_RGBA: c += sprintf(c, "/rgba"); break;
+	    case PDP_BITMAP_GREY: c += sprintf(c, "/grey"); break;
+	    case PDP_BITMAP_YV12: c += sprintf(c, "/yv12"); break;
+	    default:
+		c += sprintf(c, "/unknown"); goto exit;
+	    }
+	    c += sprintf(c, "/%dx%d", 
+			 bitmap->width, 
+			 bitmap->height);
+	exit:
+	    return pdp_gensym(description);
+	} 
+	else return pdp_gensym("unknown");
+    }
+    else return header->desc;
+}
+
+int pdp_packet_new_bitmap_yv12(u32 w, u32 h)
+{
+    t_pdp *header;
+    t_bitmap *bitmap;
+    int packet;
+
+
+    u32 size = w*h;
+    u32 totalnbpixels = size;
+    u32 packet_size = size + (size >> 1);
+
+    packet = pdp_packet_new(PDP_BITMAP, packet_size);
+    header = pdp_packet_header(packet);
+    bitmap = pdp_packet_bitmap_info(packet);
+    if (!header) return -1;
+
+    bitmap->encoding = PDP_BITMAP_YV12;
+    bitmap->width = w;
+    bitmap->height = h;
+    header->desc = pdp_packet_bitmap_get_description(packet);
+    header->theclass = bitmap_class;
+
+    return packet;
+}
+
+int pdp_packet_new_bitmap_grey(u32 w, u32 h)
+{
+    t_pdp *header;
+    t_bitmap *bitmap;
+    int packet;
+
+    u32 size = w*h;
+    u32 totalnbpixels = size;
+    u32 packet_size = totalnbpixels;
+
+    packet = pdp_packet_new(PDP_BITMAP, packet_size);
+    header = pdp_packet_header(packet);
+    bitmap = pdp_packet_bitmap_info(packet);
+    if (!header) return -1;
+
+    bitmap->encoding = PDP_BITMAP_GREY;
+    bitmap->width = w;
+    bitmap->height = h;
+    header->desc = pdp_packet_bitmap_get_description(packet);
+    header->theclass = bitmap_class;
+
+    return packet;
+}
+
+int pdp_packet_new_bitmap_rgb(u32 w, u32 h)
+{
+    t_pdp *header;
+    t_bitmap *bitmap;
+    int packet;
+
+
+    u32 size = w*h;
+    u32 totalnbpixels = size;
+    u32 packet_size = totalnbpixels * 3;
+
+    packet = pdp_packet_new(PDP_BITMAP, packet_size);
+    header = pdp_packet_header(packet);
+    bitmap = pdp_packet_bitmap_info(packet);
+    if (!header) return -1;
+
+    bitmap->encoding = PDP_BITMAP_RGB;
+    bitmap->width = w;
+    bitmap->height = h;
+    header->desc = pdp_packet_bitmap_get_description(packet);
+    header->theclass = bitmap_class;
+
+    return packet;
+}
+
+int pdp_packet_new_bitmap_rgba(u32 w, u32 h)
+{
+    t_pdp *header;
+    t_bitmap *bitmap;
+    int packet;
+
+
+    u32 size = w*h;
+    u32 totalnbpixels = size;
+    u32 packet_size = totalnbpixels * 4;
+
+    packet = pdp_packet_new(PDP_BITMAP, packet_size);
+    header = pdp_packet_header(packet);
+    bitmap = pdp_packet_bitmap_info(packet);
+    if (!header) return -1;
+
+    bitmap->encoding = PDP_BITMAP_RGBA;
+    bitmap->width = w;
+    bitmap->height = h;
+    header->desc = pdp_packet_bitmap_get_description(packet);
+    header->theclass = bitmap_class;
+
+    return packet;
+}
+
+int pdp_packet_new_bitmap(int type, u32 w, u32 h)
+{
+    switch(type){
+    case PDP_BITMAP_GREY: return pdp_packet_new_bitmap_grey(w,h);
+    case PDP_BITMAP_RGB:  return pdp_packet_new_bitmap_rgb(w,h);
+    case PDP_BITMAP_RGBA: return pdp_packet_new_bitmap_rgba(w,h);
+    default: return -1;
+    }
+}
+
+
+/* some utility methods */
+void pdp_llconv_flip_top_bottom(char *data, int width, int height, int pixelsize);
+
+/* flip top & bottom */
+void pdp_packet_bitmap_flip_top_bottom(int packet)
+{
+    t_bitmap *b = (t_bitmap *)pdp_packet_subheader(packet);
+    char *d = (char *)pdp_packet_data(packet);
+    int w,h;
+    if (!pdp_packet_bitmap_isvalid(packet)) return;
+    if (!b) return;
+    w = b->width;
+    h = b->height;
+
+    switch(b->encoding){
+    case PDP_BITMAP_GREY: pdp_llconv_flip_top_bottom(d,w,h,1); break;
+    case PDP_BITMAP_RGB:  pdp_llconv_flip_top_bottom(d,w,h,3); break;
+    case PDP_BITMAP_RGBA: pdp_llconv_flip_top_bottom(d,w,h,4); break;
+    default: break;
+    }
+
+}
+
+
+
+/* conversion methods */
+// image/grey/* -> bitmap/grey/*
+static int _pdp_packet_bitmap_convert_grey_to_grey8(int packet, t_pdp_symbol *dest_template)
+{
+    t_pdp *header = pdp_packet_header(packet);
+    t_image *image = pdp_packet_image_info(packet);
+    s16 *data = (s16 *)pdp_packet_data(packet);
+    u8 *new_data;
+    u32 w,h;
+    int new_p;
+
+    if (!pdp_packet_image_isvalid(packet)) return -1;
+    w = image->width;
+    h = image->height;
+
+    if (!((image->encoding == PDP_IMAGE_GREY) ||
+	(image->encoding == PDP_IMAGE_YV12))) return -1;
+
+    new_p = pdp_packet_new_bitmap_grey(w,h);
+    if (-1 == new_p) return -1;
+    new_data = (u8 *)pdp_packet_data(new_p);
+
+    /* convert image to greyscale 8 bit */
+    pdp_llconv(data,RIF_GREY______S16, new_data, RIF_GREY______U8, w, h);
+
+    return new_p;
+}
+
+static int _pdp_packet_bitmap_convert_YCrCb_to_rgb8(int packet, t_pdp_symbol *dest_template)
+{
+    t_pdp *header = pdp_packet_header(packet);
+    t_image *image = pdp_packet_image_info(packet);
+    s16 *data = (s16 *)pdp_packet_data(packet);
+    u8 *new_data;
+    u32 w,h;
+    int new_p;
+
+    if (!pdp_packet_image_isvalid(packet)) return -1;
+    w = image->width;
+    h = image->height;
+
+    if (!((image->encoding == PDP_IMAGE_YV12))) return -1;
+
+    new_p = pdp_packet_new_bitmap_rgb(w,h);
+    if (-1 == new_p) return -1;
+    new_data = (u8 *)pdp_packet_data(new_p);
+
+    /* convert image to greyscale 8 bit */
+    pdp_llconv(data,RIF_YVU__P411_S16, new_data, RIF_RGB__P____U8, w, h);
+
+    return new_p;
+}
+
+static int _pdp_packet_bitmap_convert_image_to_yv12(int packet, t_pdp_symbol *dest_template)
+{
+    t_pdp *header = pdp_packet_header(packet);
+    t_image *image = pdp_packet_image_info(packet);
+    s16 *data = (s16 *)pdp_packet_data(packet);
+    u8 *new_data;
+    u32 w,h, nbpixels;
+    int new_p;
+    int encoding = image->encoding;
+
+    if (!pdp_packet_image_isvalid(packet)) return -1;
+    w = image->width;
+    h = image->height;
+    nbpixels = w*h;
+
+    new_p = pdp_packet_new_bitmap_yv12(w,h);
+    if (-1 == new_p) return -1;
+    new_data = (u8 *)pdp_packet_data(new_p);
+
+    switch (encoding){
+    case PDP_IMAGE_YV12:
+	pdp_llconv(data, RIF_YVU__P411_S16, new_data, RIF_YVU__P411_U8, w, h);
+	break;
+    case PDP_IMAGE_GREY:
+	pdp_llconv(data, RIF_GREY______S16, new_data, RIF_GREY______U8, w, h);
+	memset(new_data + nbpixels, 0x80, nbpixels>>1);
+	break;
+    default:
+	/* not supported, $$$TODO add more */
+	pdp_packet_mark_unused(new_p);
+	new_p = -1;
+	break;
+    }
+
+    return new_p;
+
+}
+
+static int _pdp_packet_bitmap_convert_rgb8_to_YCrCb(int packet, t_pdp_symbol *dest_template)
+{
+    t_pdp *header = pdp_packet_header(packet);
+    t_bitmap *bitmap = pdp_packet_bitmap_info(packet);
+    u8 *data = (u8 *)pdp_packet_data(packet);
+    s16 *new_data;
+    u32 w,h;
+    int new_p;
+
+    w = bitmap->width;
+    h = bitmap->height;
+    new_p = pdp_packet_new_image_YCrCb(w,h);
+    if (-1 == new_p) return -1;
+    new_data = (s16 *)pdp_packet_data(new_p);
+
+    /* convert image to greyscale 8 bit */
+    pdp_llconv(data, RIF_RGB__P____U8, new_data, RIF_YVU__P411_S16, w, h);
+
+    return new_p;
+}
+
+static int _pdp_packet_bitmap_convert_rgb8_to_bitmap_YCrCb(int packet, t_pdp_symbol *dest_template)
+{
+    t_pdp *header = pdp_packet_header(packet);
+    t_bitmap *bitmap = pdp_packet_bitmap_info(packet);
+    u8 *data = (u8 *)pdp_packet_data(packet);
+    u8 *new_data;
+    u32 w,h;
+    int new_p;
+
+    w = bitmap->width;
+    h = bitmap->height;
+    new_p = pdp_packet_new_bitmap_yv12(w,h);
+    if (-1 == new_p) return -1;
+    new_data = (u8 *)pdp_packet_data(new_p);
+
+    /* convert image to greyscale 8 bit */
+    pdp_llconv(data, RIF_RGB__P____U8, new_data, RIF_YVU__P411_U8, w, h);
+
+    return new_p;
+}
+
+static int _pdp_packet_bitmap_convert_grey8_to_grey(int packet, t_pdp_symbol *dest_template)
+{
+    t_pdp *header = pdp_packet_header(packet);
+    t_bitmap *bitmap = pdp_packet_bitmap_info(packet);
+    s16 *data = (s16 *)pdp_packet_data(packet);
+    u8 *new_data;
+    u32 w,h;
+    int new_p;
+
+    w = bitmap->width;
+    h = bitmap->height;
+    new_p = pdp_packet_new_image_grey(w,h);
+    if (-1 == new_p) return -1;
+    new_data = (u8 *)pdp_packet_data(new_p);
+
+    /* convert image to greyscale 8 bit */
+    pdp_llconv(data, RIF_GREY______U8, new_data, RIF_GREY______S16, w, h);
+
+    return new_p;
+}
+static int _pdp_packet_bitmap_convert_rgb8_to_rgba8(int packet, t_pdp_symbol *dest_template)
+{
+    t_pdp *header = pdp_packet_header(packet);
+    t_bitmap *bitmap = pdp_packet_bitmap_info(packet);
+    u8 *data = (u8 *)pdp_packet_data(packet);
+    u8 *new_data;
+    int w,h, new_p, i;
+
+    w = bitmap->width;
+    h = bitmap->height;
+    new_p = pdp_packet_new_bitmap_rgba(w,h);
+    if (-1 == new_p) return -1;
+    new_data = (u8 *)pdp_packet_data(new_p);
+
+    for(i=0; i<w*h; i++){
+	new_data[4*i+0]    = data[3*i + 0];
+	new_data[4*i+1]    = data[3*i + 1];
+	new_data[4*i+2]    = data[3*i + 2];
+	new_data[4*i+3]    = 0;
+    }
+
+    return new_p;
+}
+static int _pdp_packet_bitmap_convert_rgba8_to_rgb8(int packet, t_pdp_symbol *dest_template)
+{
+    t_pdp *header = pdp_packet_header(packet);
+    t_bitmap *bitmap = pdp_packet_bitmap_info(packet);
+    u8 *data = (u8 *)pdp_packet_data(packet);
+    u8 *new_data;
+    int w,h, new_p, i;
+
+    w = bitmap->width;
+    h = bitmap->height;
+    new_p = pdp_packet_new_bitmap_rgb(w,h);
+    if (-1 == new_p) return -1;
+    new_data = (u8 *)pdp_packet_data(new_p);
+
+    for(i=0; i<w*h; i++){
+	new_data[3*i+0]    = data[4*i + 0];
+	new_data[3*i+1]    = data[4*i + 1];
+	new_data[3*i+2]    = data[4*i + 2];
+    }
+
+    return new_p;
+}
+static int _pdp_packet_bitmap_convert_rgb8_to_mchp(int packet, t_pdp_symbol *dest_template)
+{
+    t_pdp *header = pdp_packet_header(packet);
+    t_bitmap *bitmap = pdp_packet_bitmap_info(packet);
+    u8 *data = (u8 *)pdp_packet_data(packet);
+    s16 *new_data;
+    int w,h;
+    int new_p, i, plane;
+
+    w = bitmap->width;
+    h = bitmap->height;
+    plane = w*h;
+    new_p = pdp_packet_new_image_multi(w,h,3);
+    if (-1 == new_p) return -1;
+    new_data = (s16 *)pdp_packet_data(new_p);
+
+    for(i=0; i<w*h; i++){
+	new_data[i]          = ((u32)data[3*i + 0]) << 7;
+	new_data[i+plane]    = ((u32)data[3*i + 1]) << 7;
+	new_data[i+plane*2]  = ((u32)data[3*i + 2]) << 7;
+    }
+
+    return new_p;
+}
+
+static int _pdp_packet_bitmap_convert_yv12_to_image(int packet, t_pdp_symbol *dest_template)
+{
+    t_pdp *header = pdp_packet_header(packet);
+    t_bitmap *bitmap = pdp_packet_bitmap_info(packet);
+    u8 *data = (u8 *)pdp_packet_data(packet);
+    s16 *new_data;
+    int w,h;
+    int new_p;
+
+    w = bitmap->width;
+    h = bitmap->height;
+    new_p = pdp_packet_new_image_YCrCb(w,h);
+    new_data = pdp_packet_data(new_p);
+    if (-1 == new_p || !new_data) return -1;
+    pdp_llconv(data, RIF_YVU__P411_U8, new_data, RIF_YVU__P411_S16, w, h);
+
+    return new_p;
+}
+
+static int _pdp_packet_bitmap_convert_mchp_to_rgb8(int packet, t_pdp_symbol *dest_template)
+{
+    t_pdp *header = pdp_packet_header(packet);
+    t_image *image = (t_image *)pdp_packet_subheader(packet);
+    s16 *data = (s16 *)pdp_packet_data(packet);
+    u8 *new_data;
+    int w = image->width;
+    int h = image->height;
+    int plane = w*h;
+    int nb_channels = image->depth;
+    int new_p, i;
+
+    static inline u8 _map(s32 pixel){
+	s32 mask = ~(pixel>>16);
+	return ((pixel >> 7) & mask);
+    }
+
+    switch(nb_channels){
+    default: return -1;
+    case 1:
+	if (-1 == (new_p = pdp_packet_new_bitmap_grey(w,h))) return -1;
+	new_data = (u8*)pdp_packet_data(new_p);
+	for(i=0; i<plane; i++) new_data[i] = _map(data[i]); 
+	break;
+    case 3:
+	if (-1 == (new_p = pdp_packet_new_bitmap_rgb(w,h)))  return -1;
+	new_data = (u8*)pdp_packet_data(new_p);
+	for(i=0; i<plane; i++){
+	    new_data[3*i+0] = _map(data[i]); 
+	    new_data[3*i+1] = _map(data[i+plane]); 
+	    new_data[3*i+2] = _map(data[i+plane*2]);
+	}
+	break;
+    case 4:
+	if (-1 == (new_p = pdp_packet_new_bitmap_rgba(w,h))) return -1;
+	new_data = (u8*)pdp_packet_data(new_p);
+	for(i=0; i<plane; i++){
+	    new_data[4*i+0] = _map(data[i]); 
+	    new_data[4*i+1] = _map(data[i+plane]); 
+	    new_data[4*i+2] = _map(data[i+plane*2]);
+	    new_data[4*i+3] = _map(data[i+plane*3]);
+	}
+	break;
+	
+	
+    }
+
+    return new_p;
+
+}
+
+static int _pdp_packet_bitmap_convert_fallback(int packet, t_pdp_symbol *dest_template)
+{
+    post("can't convert image type %s to %s",
+	 pdp_packet_get_description(packet)->s_name, dest_template->s_name);
+
+    return -1;
+}
+
+static int pdp_bitmap_factory(t_pdp_symbol *type)
+{
+    return -1;
+}
+
+void pdp_bitmap_setup(void)
+{
+    t_pdp_conversion_program *program;
+
+    /* setup class object */
+    bitmap_class = pdp_class_new(pdp_gensym("bitmap/*/*"), pdp_bitmap_factory);
+				 
+
+    /* setup conversion programs */
+    program = pdp_conversion_program_new(_pdp_packet_bitmap_convert_grey_to_grey8, 0);
+    pdp_type_register_conversion(pdp_gensym("image/grey/*"), pdp_gensym("bitmap/grey/*"), program);
+
+    program = pdp_conversion_program_new(_pdp_packet_bitmap_convert_grey8_to_grey, 0);
+    pdp_type_register_conversion(pdp_gensym("bitmap/grey/*"), pdp_gensym("image/grey/*"), program);
+
+    program = pdp_conversion_program_new(_pdp_packet_bitmap_convert_YCrCb_to_rgb8, 0);
+    pdp_type_register_conversion(pdp_gensym("image/YCrCb/*"), pdp_gensym("bitmap/rgb/*"), program);
+
+    program = pdp_conversion_program_new(_pdp_packet_bitmap_convert_image_to_yv12, 0);
+    pdp_type_register_conversion(pdp_gensym("image/YCrCb/*"), pdp_gensym("bitmap/yv12/*"), program);
+    pdp_type_register_conversion(pdp_gensym("image/grey/*"), pdp_gensym("bitmap/yv12/*"), program);
+
+    program = pdp_conversion_program_new(_pdp_packet_bitmap_convert_yv12_to_image, 0);
+    pdp_type_register_conversion(pdp_gensym("bitmap/yv12/*"), pdp_gensym("image/YCrCb/*"), program);
+
+    /* rgb->YCrCb converts the colour space */
+    program = pdp_conversion_program_new(_pdp_packet_bitmap_convert_rgb8_to_YCrCb, 0);
+    pdp_type_register_conversion(pdp_gensym("bitmap/rgb/*"), pdp_gensym("image/YCrCb/*"), program);
+
+
+    /* rgb <-> multi does not convert the colour space */
+    program = pdp_conversion_program_new(_pdp_packet_bitmap_convert_rgb8_to_mchp, 0);
+    pdp_type_register_conversion(pdp_gensym("bitmap/rgb/*"), pdp_gensym("image/multi/*"), program);
+
+    program = pdp_conversion_program_new(_pdp_packet_bitmap_convert_mchp_to_rgb8, 0);
+    pdp_type_register_conversion(pdp_gensym("image/multi/*"), pdp_gensym("bitmap/*/*"), program);
+
+
+    /* rgb <-> rgba */
+    program = pdp_conversion_program_new(_pdp_packet_bitmap_convert_rgb8_to_rgba8, 0);
+    pdp_type_register_conversion(pdp_gensym("bitmap/rgb/*"), pdp_gensym("bitmap/rgba/*"), program);
+    program = pdp_conversion_program_new(_pdp_packet_bitmap_convert_rgba8_to_rgb8, 0);
+    pdp_type_register_conversion(pdp_gensym("bitmap/rgba/*"), pdp_gensym("bitmap/rgb/*"), program);
+
+
+    /* fallback rgb convertor */
+    program = pdp_conversion_program_new(_pdp_packet_bitmap_convert_rgb8_to_YCrCb, 0);
+    pdp_type_register_conversion(pdp_gensym("bitmap/rgb/*"), pdp_gensym("image/*/*"), program);
+
+    program = pdp_conversion_program_new(_pdp_packet_bitmap_convert_rgb8_to_bitmap_YCrCb, 0);
+    pdp_type_register_conversion(pdp_gensym("bitmap/rgb/*"), pdp_gensym("bitmap/yv12/*"), program);
+
+
+    /* fallbacks */
+    program = pdp_conversion_program_new(_pdp_packet_bitmap_convert_fallback, 0);
+    pdp_type_register_conversion(pdp_gensym("image/*/*"), pdp_gensym("bitmap/*/*"), program);
+    pdp_type_register_conversion(pdp_gensym("bitmap/*/*"), pdp_gensym("image/*/*"), program);
+    pdp_type_register_conversion(pdp_gensym("bitmap/*/*"), pdp_gensym("bitmap/*/*"), program);
+
+}
diff --git a/system/type/pdp_image.c b/system/type/pdp_image.c
new file mode 100644
index 0000000..1aa9763
--- /dev/null
+++ b/system/type/pdp_image.c
@@ -0,0 +1,580 @@
+/*
+ *   Pure Data Packet system implementation. : 16 bit image packet implementation
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+/*
+  This file contains methods for the image packets
+  pdp_packet_new_* methods are several image packet constructors
+  pdp_type_* are image type checkers & converters
+
+*/
+
+#include "pdp.h"
+#include "pdp_internals.h"
+#include <stdio.h>
+
+
+/* the class object */
+static t_pdp_class* image_class;
+
+
+
+/* check dimensions */
+static void _checkdim(u32 width, u32 height){
+    if 	((pdp_imageproc_legalwidth(width) != width) ||
+	 (pdp_imageproc_legalheight(height) != height)){
+	post("WARNING: request to create image packet with illegal dimensions %d x %d", width, height);
+    }
+}	    
+
+
+/* image packet constructors */
+int pdp_packet_new_image_YCrCb(u32 w, u32 h)
+{
+    t_pdp *header;
+    t_image *image;
+    int packet;
+
+
+    u32 size = w*h;
+    u32 totalnbpixels = size + (size >> 1);
+    u32 packet_size = totalnbpixels << 1;
+
+    _checkdim(w,h);
+
+    packet = pdp_packet_new(PDP_IMAGE, packet_size);
+    header = pdp_packet_header(packet);
+    image = pdp_packet_image_info(packet);
+    if (!header) return -1;
+
+    image->encoding = PDP_IMAGE_YV12;
+    image->width = w;
+    image->height = h;
+    header->desc = pdp_packet_image_get_description(packet);
+    header->theclass = image_class;
+
+    return packet;
+}
+
+int pdp_packet_new_image_grey(u32 w, u32 h)
+{
+    t_pdp *header;
+    t_image *image;
+    int packet;
+
+
+    u32 size = w*h;
+    u32 totalnbpixels = size;
+    u32 packet_size = totalnbpixels << 1;
+
+    _checkdim(w,h);
+
+    packet = pdp_packet_new(PDP_IMAGE, packet_size);
+    header = pdp_packet_header(packet);
+    image = pdp_packet_image_info(packet);
+    if (!header) return -1;
+
+    image->encoding = PDP_IMAGE_GREY;
+    image->width = w;
+    image->height = h;
+    header->desc = pdp_packet_image_get_description(packet);
+    header->theclass = image_class;
+
+    return packet;
+}
+
+int pdp_packet_new_image_mchp(u32 w, u32 h, u32 d)
+{
+    t_pdp *header;
+    t_image *image;
+    int packet;
+
+
+    u32 size = w*h*d;
+    u32 totalnbpixels = size;
+    u32 packet_size = totalnbpixels << 1;
+
+    _checkdim(w,h);
+
+    packet = pdp_packet_new(PDP_IMAGE, packet_size);
+    header = pdp_packet_header(packet);
+    image = pdp_packet_image_info(packet);
+    if (!header) return -1;
+
+
+    image->encoding = PDP_IMAGE_MCHP;
+    image->width = w;
+    image->height = h;
+    image->depth = d;
+    header->desc = pdp_packet_image_get_description(packet);
+    header->theclass = image_class;
+
+    return packet;
+}
+
+
+int pdp_packet_new_image(u32 type, u32 w, u32 h)
+{
+    switch (type){
+    case PDP_IMAGE_YV12:
+	return pdp_packet_new_image_YCrCb(w,h);
+    case PDP_IMAGE_GREY:
+	return pdp_packet_new_image_grey(w,h);
+    default:
+	return -1;
+    }
+}
+
+
+/****************** packet type checking and conversion methods ********************/
+
+
+
+/* check if two image packets are allocated and of the same type */
+int pdp_packet_image_compat(int packet0, int packet1)
+{
+    t_pdp *header0 = pdp_packet_header(packet0);
+    t_pdp *header1 = pdp_packet_header(packet1);
+    t_image *image0 = pdp_packet_image_info(packet0);
+    t_image *image1 = pdp_packet_image_info(packet1);
+
+
+    if (!(pdp_packet_compat(packet0, packet1))) return 0;
+    if (header0->type != PDP_IMAGE){
+	//post("pdp_type_compat_image: not a PDP_IMAGE");
+	return 0;
+    }
+    if (image0->encoding != image1->encoding){
+	//post("pdp_type_compat_image: encodings differ");
+	return 0;
+    }
+    if (image0->width != image1->width){
+	//post("pdp_type_compat_image: image withs differ");
+	return 0;
+    }
+    if (image0->height != image1->height){
+	//post("pdp_type_compat_image: image heights differ");
+	return 0;
+    }
+    return 1;
+}
+
+/* check if packet is a valid image packet */
+int pdp_packet_image_isvalid(int packet)
+{
+    t_pdp *header = pdp_packet_header(packet);
+    t_image *image = pdp_packet_image_info(packet);
+    if (!header) return 0;
+    if (PDP_IMAGE != header->type) return 0;
+    if ((PDP_IMAGE_YV12 != image->encoding)
+	&& (PDP_IMAGE_GREY != image->encoding)
+	&& (PDP_IMAGE_MCHP != image->encoding)) return 0;
+
+    return 1;
+
+}
+
+/* set the channel mask for the image */
+void pdp_packet_image_set_chanmask(int packet, unsigned int chanmask)
+{
+    if (pdp_packet_image_isvalid(packet)) pdp_packet_image_info(packet)->chanmask = chanmask;
+    
+}
+
+
+t_image *pdp_packet_image_info(int packet)
+{
+    return (t_image *)pdp_packet_subheader(packet);
+}
+
+
+t_pdp_symbol *pdp_packet_image_get_description(int packet)
+{
+    t_pdp *header = pdp_packet_header(packet);
+    t_image *image = pdp_packet_image_info(packet);
+    char description[1024];
+    char *c = description;
+    int encoding;
+
+    if (!header) return pdp_gensym("invalid");
+    else if (!header->desc){
+	/* if description is not defined, try to reconstruct it (for backwards compat) */
+	if (header->type == PDP_IMAGE){
+	    c += sprintf(c, "image");
+	    encoding = image->encoding;
+	    switch(encoding){
+	    case PDP_IMAGE_YV12: c += sprintf(c, "/YCrCb"); break;
+	    case PDP_IMAGE_GREY: c += sprintf(c, "/grey"); break;
+	    case PDP_IMAGE_MCHP: c += sprintf(c, "/multi"); break;
+	    default:
+		c += sprintf(c, "/unknown"); goto exit;
+	    }
+	    if (encoding == PDP_IMAGE_MCHP){
+		c += sprintf(c, "/%dx%dx%d", 
+			     image->width, 
+			     image->height,
+			     image->depth);
+	    }
+	    else {
+		c += sprintf(c, "/%dx%d", 
+			     image->width, 
+			     image->height);
+	    }
+
+	exit:
+	    return pdp_gensym(description);
+	} 
+	else return pdp_gensym("unknown");
+    }
+    else return header->desc;
+}
+
+
+
+
+
+/* IMAGE PACKAGE CONVERSION ROUTINES */
+
+/* note: these are internal: no extra checking is done
+   it is assumed the packets are of correct type (the type template associated with the conversion program) */
+
+// image/YCrCb/* -> image/grey/*
+// image/multi/* -> image/grey/*  (only first channel)
+static int _pdp_packet_image_convert_YCrCb_to_grey(int packet, t_pdp_symbol *dest_template)
+{
+    t_pdp *header = pdp_packet_header(packet);
+    t_image *image = pdp_packet_image_info(packet);
+    int w = image->width;
+    int h = image->height;
+    int p = pdp_packet_new_image_grey(w,h);
+    if (p == -1) return p;
+    memcpy(pdp_packet_data(p), pdp_packet_data(packet), 2*w*h);
+    return p;
+}
+
+// image/grey/* -> image/YCrCb/*
+static int _pdp_packet_image_convert_grey_to_YCrCb(int packet, t_pdp_symbol *dest_template)
+{
+    t_pdp *header = pdp_packet_header(packet);
+    t_image *image = pdp_packet_image_info(packet);
+    int w = image->width;
+    int h = image->height;
+    int p = pdp_packet_new_image_YCrCb(w,h);
+    int y_bytes = 2*w*h;
+    void *data;
+    if (p == -1) return p;
+    data = pdp_packet_data(p);
+    memcpy(data, pdp_packet_data(packet), y_bytes);
+    memset(data+y_bytes, 0, y_bytes >> 1);
+    return p;
+}
+
+// image/grey/* -> image/multi/*
+static int _pdp_packet_image_convert_grey_to_multi(int packet, t_pdp_symbol *dest_template)
+{
+    t_pdp *header = pdp_packet_header(packet);
+    t_image *image = pdp_packet_image_info(packet);
+    int w = image->width;
+    int h = image->height;
+    int p = pdp_packet_new_image_mchp(w,h,1);
+    int y_bytes = 2*w*h;
+    void *data;
+    if (p == -1) return p;
+    data = pdp_packet_data(p);
+    memcpy(data, pdp_packet_data(packet), y_bytes);
+    return p;
+}
+
+// image/multi/* -> image/YCrCb/*  (only first 3 channels)
+static int _pdp_packet_image_convert_multi_to_YCrCb(int packet, t_pdp_symbol *dest_template)
+{
+    t_pdp *header = pdp_packet_header(packet);
+    t_image *image = pdp_packet_image_info(packet);
+    s16 *data, *newdata;
+
+    /* get info */
+    int w = image->width;
+    int h = image->height;
+    int d = image->depth;
+    int plane_size = w*h;
+
+    /* create new packet */
+    int newpacket = pdp_packet_new_image_YCrCb(w, h);
+    if (-1 == newpacket) return -1;
+
+    data = pdp_packet_data(packet);
+    newdata = pdp_packet_data(newpacket);
+
+    /* copy channel 0 */
+    memcpy(newdata, data, plane_size<<1);
+    newdata += plane_size;
+    data += plane_size;
+
+    /* copy channel 1 */
+    if (d >= 1) pdp_resample_halve(data, newdata, w, h);
+    else        memset(newdata, 0, plane_size >> 1);
+    data += plane_size;
+    newdata += (plane_size >> 2);
+
+
+    /* copy channel 2 */
+    if (d >= 2) pdp_resample_halve(data, newdata, w, h);
+    else        memset(newdata, 0, plane_size >> 1);
+
+    return newpacket;
+    
+}
+
+// image/YCrCb/* -> image/multi/*
+static int _pdp_packet_image_convert_YCrCb_to_multi(int packet, t_pdp_symbol *dest_template)
+{
+    t_pdp *header = pdp_packet_header(packet);
+    t_image *image = pdp_packet_image_info(packet);
+    s16 *data, *newdata;
+
+    /* get info */
+    int w = image->width;
+    int h = image->height;
+    int plane_size = w*h;
+
+    /* create new packet */
+    int newpacket = pdp_packet_new_image_mchp(w, h, 3);
+    if (-1 == newpacket) return -1;
+
+    data = pdp_packet_data(packet);
+    newdata = pdp_packet_data(newpacket);
+
+    /* copy channel 0 */
+    memcpy(newdata, data, plane_size<<1);
+    newdata += plane_size;
+    data += plane_size;
+    w >>= 1;
+    h >>= 1;
+
+    /* copy channel 1 */
+    pdp_resample_double(data, newdata, w, h);
+    data += (plane_size >> 2);
+    newdata += plane_size;
+
+    /* copy channel 2 */
+    pdp_resample_double(data, newdata, w, h);
+
+    return newpacket;
+    
+}
+
+static void _pdp_description_get_dims(t_pdp_symbol *template, int *w, int *h, int *d)
+{
+    char *c = template->s_name;
+    // get requested dimensions
+    *w = 0;
+    *h = 0;
+    *d = 0;
+    while (*c++ != '/');
+    while (*c++ != '/');
+    sscanf(c, "%dx%dx%d", w, h, d);
+
+}
+
+// resample image/YCrCb/*
+static int _pdp_packet_image_convert_resample_YCrCb(int packet, t_pdp_symbol *dest_template)
+{
+    int quality = 1;
+    int dst_w, dst_h, dummy;
+    int new_packet;
+    unsigned int src_size, src_voffset, src_uoffset;
+    unsigned int dst_size, dst_voffset, dst_uoffset;
+    t_pdp *header0 = pdp_packet_header(packet);
+    t_image *image0 = pdp_packet_image_info(packet);
+    unsigned int src_w = image0->width;
+    unsigned int src_h = image0->height;
+    short int *src_image = (short int *)pdp_packet_data(packet);
+    short int *dst_image;
+    _pdp_description_get_dims(dest_template, &dst_w, &dst_h, &dummy);
+    new_packet = pdp_packet_new_image_YCrCb(dst_w, dst_h);
+    if (-1 == new_packet) return -1;
+    dst_image = (short int*)pdp_packet_data(new_packet);
+    src_size = src_w*src_h;
+    src_voffset = src_size;
+    src_uoffset = src_size + (src_size>>2);
+    dst_size = dst_w*dst_h;
+    dst_voffset = dst_size;
+    dst_uoffset = dst_size + (dst_size>>2);
+    if (quality){
+	pdp_resample_scale_bilin(src_image, dst_image, src_w, src_h, dst_w, dst_h);
+	pdp_resample_scale_bilin(src_image+src_voffset, dst_image+dst_voffset, src_w>>1, src_h>>1, dst_w>>1, dst_h>>1);
+	pdp_resample_scale_bilin(src_image+src_uoffset, dst_image+dst_uoffset, src_w>>1, src_h>>1, dst_w>>1, dst_h>>1);
+    }
+    else{
+	pdp_resample_scale_nn(src_image, dst_image, src_w, src_h, dst_w, dst_h);
+	pdp_resample_scale_nn(src_image+src_voffset, dst_image+dst_voffset, src_w>>1, src_h>>1, dst_w>>1, dst_h>>1);
+	pdp_resample_scale_nn(src_image+src_uoffset, dst_image+dst_uoffset, src_w>>1, src_h>>1, dst_w>>1, dst_h>>1);
+    }
+    return new_packet;
+}
+
+// resample image/grey/* and image/multi/*
+static int _pdp_packet_image_convert_resample_multi(int packet, t_pdp_symbol *dest_template)
+{
+    int quality = 1;
+    int dst_w, dst_h, depth;
+    int new_packet;
+    unsigned int src_size;
+    unsigned int dst_size;
+    t_pdp *header0 = pdp_packet_header(packet);
+    t_image *image0 = pdp_packet_image_info(packet);
+    unsigned int src_w = image0->width;
+    unsigned int src_h = image0->height;
+    short int *src_image = (short int *)pdp_packet_data(packet);
+    short int *dst_image;
+    _pdp_description_get_dims(dest_template, &dst_w, &dst_h, &depth);
+
+    if (depth == 0){
+	depth = 1;
+	new_packet = pdp_packet_new_image_grey(dst_w, dst_h);
+    }
+    else {
+	new_packet = pdp_packet_new_image_mchp(dst_w, dst_h, depth);
+    }
+    if (-1 == new_packet) return -1;
+
+    dst_image = (short int*)pdp_packet_data(new_packet);
+
+    src_size = src_w*src_h;
+    dst_size = dst_w*dst_h;
+    while (depth--){
+	if (quality){
+	    pdp_resample_scale_bilin(src_image, dst_image, src_w, src_h, dst_w, dst_h);
+	}
+	else{
+	    pdp_resample_scale_nn(src_image, dst_image, src_w, src_h, dst_w, dst_h);
+	}
+	src_image += src_size;
+	dst_image += dst_size;
+    }
+
+    return new_packet;
+}
+
+static int _pdp_packet_image_convert_fallback(int packet, t_pdp_symbol *dest_template)
+{
+    post("can't convert image type %s to %s",
+	 pdp_packet_get_description(packet)->s_name, dest_template->s_name);
+
+    return -1;
+}
+
+
+
+/* the expensive factory method */
+static int pdp_image_factory(t_pdp_symbol *type)
+{
+    t_pdp_list *l;
+    t_pdp_symbol *s;
+    int t;
+    int w = 0;
+    int h = 0;
+    int d = 0;
+    int p = -1;
+    int n = 0;
+    int m = 0;
+    char *garbage = 0;
+
+    //post("creating:");
+    //post("%s", type->s_name);
+
+    l = pdp_type_to_list(type);
+    s = pdp_list_pop(l).w_symbol; // first element is "image"
+    s = pdp_list_pop(l).w_symbol;
+
+    /* get image type */
+    if (s == pdp_gensym("grey")) t = PDP_IMAGE_GREY;
+    else if (s == pdp_gensym("YCrCb")) t = PDP_IMAGE_YV12;
+    else if (s == pdp_gensym("multi")) t = PDP_IMAGE_MCHP;
+    else goto exit;
+    
+    /* get image dimensions and create image */
+    s = pdp_list_pop(l).w_symbol;
+    switch (t){
+    case PDP_IMAGE_MCHP:
+	m  = sscanf(s->s_name, "%dx%dx%d", &w, &h, &d);
+	p = pdp_packet_new_image_mchp(w,h,d);
+	break;
+    default:
+	sscanf(s->s_name, "%dx%d", &w, &h);
+	p = pdp_packet_new_image(t,w,h);
+	break;
+    }
+    if (p != -1){
+	t_pdp *h = pdp_packet_header(p);
+	/* if type is not exact, delete the packet */
+	if (type != h->desc) {
+	    pdp_packet_delete(p);
+	    p = -1;
+	}
+    }
+ exit:
+    pdp_list_free(l);
+    return p;
+}
+
+
+
+void pdp_image_words_setup(t_pdp_class *c);
+
+void pdp_image_setup(void)
+{
+    t_pdp_conversion_program *program;
+
+    /* setup the class object */
+    image_class = pdp_class_new(pdp_gensym("image/*/*"), pdp_image_factory);
+    
+    /* setup image words  */
+    pdp_image_words_setup(image_class);
+
+
+    /* setup conversion programs */
+    program = pdp_conversion_program_new(_pdp_packet_image_convert_YCrCb_to_grey, 0);
+    pdp_type_register_conversion(pdp_gensym("image/YCrCb/*"), pdp_gensym("image/grey/*"), program);
+    pdp_type_register_conversion(pdp_gensym("image/multi/*"), pdp_gensym("image/grey/*"), program);
+
+    program = pdp_conversion_program_new(_pdp_packet_image_convert_grey_to_YCrCb, 0);
+    pdp_type_register_conversion(pdp_gensym("image/grey/*"), pdp_gensym("image/YCrCb/*"), program);
+
+    program = pdp_conversion_program_new(_pdp_packet_image_convert_grey_to_multi, 0);
+    pdp_type_register_conversion(pdp_gensym("image/grey/*"), pdp_gensym("image/multi/*"), program);
+
+    program = pdp_conversion_program_new(_pdp_packet_image_convert_multi_to_YCrCb, 0);
+    pdp_type_register_conversion(pdp_gensym("image/multi/*"), pdp_gensym("image/YCrCb/*"), program);
+
+    program = pdp_conversion_program_new(_pdp_packet_image_convert_YCrCb_to_multi, 0);
+    pdp_type_register_conversion(pdp_gensym("image/YCrCb/*"), pdp_gensym("image/multi/*"), program);
+
+    program = pdp_conversion_program_new(_pdp_packet_image_convert_resample_YCrCb, 0);
+    pdp_type_register_conversion(pdp_gensym("image/YCrCb/*"), pdp_gensym("image/YCrCb/*"), program);
+
+    program = pdp_conversion_program_new(_pdp_packet_image_convert_resample_multi, 0);
+    pdp_type_register_conversion(pdp_gensym("image/multi/*"), pdp_gensym("image/multi/*"), program);
+    pdp_type_register_conversion(pdp_gensym("image/grey/*"), pdp_gensym("image/grey/*"), program);
+
+    /* catch-all fallback */
+    program = pdp_conversion_program_new(_pdp_packet_image_convert_fallback, 0);
+    pdp_type_register_conversion(pdp_gensym("image/*/*"), pdp_gensym("image/*/*"), program);
+							     
+}
diff --git a/system/type/pdp_image_words.c b/system/type/pdp_image_words.c
new file mode 100644
index 0000000..32b6652
--- /dev/null
+++ b/system/type/pdp_image_words.c
@@ -0,0 +1,176 @@
+/*
+ *   Pure Data Packet system implementation. : methods for the 16 bit image packet
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+/* image packet method implementation */
+
+
+#include "pdp.h"
+#include "pdp_forth.h"
+
+
+
+// (p0, p1) -> (p0 (operator) p1)
+t_pdp_word_error pdp_word_image_pp(t_pdp_stack *s, void *process_routine)
+{
+    int chanmask = -1;
+    int packet1 = -1;
+    int packet2 = -1;
+
+    /* handle stack underflow */
+    if (s->elements < 2) return e_underflow;
+
+    /* get the packets from the stack */
+    pdp_stack_pop_packet(s, &packet1);
+    pdp_stack_pop_packet(s, &packet2);
+
+    /* ensure the destination packet is writable */
+    pdp_packet_replace_with_writable(&packet1);
+
+    /* process */
+    pdp_imageproc_dispatch_2buf(process_routine, 0, chanmask, packet1, packet2);
+
+    /* push result on stack */
+    pdp_stack_push_packet(s, packet1);
+
+    /* release the second packet */
+    pdp_packet_mark_unused(packet2);
+
+    return e_ok;
+}
+
+t_pdp_word_error pdp_word_image_add(t_pdp_stack *s) {return pdp_word_image_pp(s, pdp_imageproc_add_process);}
+t_pdp_word_error pdp_word_image_mul(t_pdp_stack *s) {return pdp_word_image_pp(s, pdp_imageproc_mul_process);}
+
+
+/* enter a (float packet packet) -> (packet)  routine */
+#define ENTER_FPP_P(f, p0, p1)			\
+void *x;					\
+int p0;						\
+int p1;						\
+float f;					\
+if (s->elements < (3)) return e_underflow;	\
+pdp_stack_pop_float(s, &(f));			\
+pdp_stack_pop_packet(s, &(p0));			\
+pdp_stack_pop_packet(s, &(p1));			\
+pdp_packet_replace_with_writable(&(p0));
+
+/* leave a (float packet packet) -> (packet) routine */
+#define LEAVE_FPP_P(p0, p1)			\
+pdp_stack_push_packet(s, p0);			\
+pdp_packet_mark_unused(p1);			\
+return e_ok;
+
+
+// (f, p0, p1) -> ((1-f)*p0 + f*p1)
+t_pdp_word_error pdp_word_image_mix(t_pdp_stack *s)
+{
+    ENTER_FPP_P(mix, p0, p1);
+
+    /* process */
+    x = pdp_imageproc_mix_new();
+    pdp_imageproc_mix_setleftgain(x, 1.0f - mix);
+    pdp_imageproc_mix_setrightgain(x, mix);
+    pdp_imageproc_dispatch_2buf(&pdp_imageproc_mix_process, x, -1, p0, p1);
+    pdp_imageproc_mix_delete(x);
+
+    LEAVE_FPP_P(p0, p1); 
+}
+
+// (f, p0) -> (f*p0)
+t_pdp_word_error pdp_word_image_gain(t_pdp_stack *s)
+{
+    void *gaindata;
+    int chanmask = -1;
+    int packet = -1;
+    float gain = 0.5f;
+
+    /* handle stack underflow */
+    if (s->elements < 2) return e_underflow;
+
+    /* get the packets from the stack */
+    pdp_stack_pop_float(s, &gain);
+    pdp_stack_pop_packet(s, &packet);
+
+    /* ensure the destination packet is writable */
+    pdp_packet_replace_with_writable(&packet);
+
+    /* process */
+    gaindata = pdp_imageproc_gain_new();
+    pdp_imageproc_gain_setgain(gaindata, gain);
+    pdp_imageproc_dispatch_1buf(&pdp_imageproc_gain_process, gaindata, chanmask, packet);
+    pdp_imageproc_mix_delete(gaindata);
+
+    /* push result on stack */
+    pdp_stack_push_packet(s, packet);
+
+    return e_ok;
+
+}
+// (f, p0) -> (f*p0)
+t_pdp_word_error pdp_word_image_chanmask(t_pdp_stack *s)
+{
+    unsigned int chanmask = 0;
+    int packet = -1;
+
+    /* handle stack underflow */
+    if (s->elements < 2) return e_underflow;
+
+    /* get the packets from the stack */
+    pdp_stack_pop_int(s, &chanmask);
+    pdp_stack_pop_packet(s, &packet);
+
+    /* ensure the destination packet is writable */
+    pdp_packet_replace_with_writable(&packet);
+
+    /* set channel mask */
+    pdp_packet_image_set_chanmask(packet, chanmask);
+
+    /* push result on stack */
+    pdp_stack_push_packet(s, packet);
+
+    return e_ok;
+
+}
+
+static void _add_image_primitive(char *name, int in, int out, int type_index, void *w)
+{
+    pdp_forthdict_add_primitive(pdp_gensym(name), w, in, out, type_index, pdp_gensym("image/*/*"));
+}
+
+	    
+void pdp_image_words_setup(t_pdp_class *c)
+{
+    /* add image specific words */
+    _add_image_primitive ("add", 2, 1, 0, pdp_word_image_add);
+    _add_image_primitive ("mix", 3, 1, 1, pdp_word_image_mix);
+    _add_image_primitive ("scale", 2, 1, 1, pdp_word_image_gain);
+    _add_image_primitive ("mul", 2, 1, 0, pdp_word_image_mul);
+    _add_image_primitive ("chanmask", 2, 1, 1, pdp_word_image_chanmask);
+
+    /* add some type oblivious words */
+    pdp_forthdict_compile_word(pdp_gensym("add3"),    "(add dup add)",   2, 1, -1, 0);
+    pdp_forthdict_compile_word(pdp_gensym("mixtest"), "(0.8 2 mov mix)", 2, 1, -1, 0);
+
+
+    /* define a processor:
+
+    def = pdp_forth_compile_def("(inlist, outlist, setup, process)");
+    */
+}
diff --git a/system/type/pdp_matrix.c b/system/type/pdp_matrix.c
new file mode 100644
index 0000000..1334864
--- /dev/null
+++ b/system/type/pdp_matrix.c
@@ -0,0 +1,649 @@
+
+#include "pdp.h"
+#include "pdp_internals.h"
+
+/* the class object */
+static t_pdp_class *matrix_class;
+
+
+
+/* declare header and subheader variables and exit with errval if invalid */
+#define VALID_MATRIX_HEADER(packet, header, subheader, mtype, errval)   \
+t_pdp *    header    = pdp_packet_header( packet );			\
+t_matrix * subheader = (t_matrix *)pdp_packet_subheader( packet );	\
+if (! header ) return errval;						\
+if (PDP_MATRIX != header->type) return errval;				\
+if (mtype) {if (subheader->type != mtype) return errval;}
+
+
+int pdp_packet_matrix_isvalid(int p)
+{
+    VALID_MATRIX_HEADER(p, h, m, 0, 0);
+    return 1;
+}
+
+
+void *pdp_packet_matrix_get_gsl_matrix(int p, u32 type)
+{
+    VALID_MATRIX_HEADER(p, h, m, type, 0);
+    return &m->matrix;
+}
+
+void *pdp_packet_matrix_get_gsl_vector(int p, u32 type)
+{
+    VALID_MATRIX_HEADER(p, h, m, type, 0);
+    return &m->vector;
+}
+
+int pdp_packet_matrix_get_type(int p)
+{
+    VALID_MATRIX_HEADER(p, h, m, 0, 0);
+    return m->type;
+}
+
+int pdp_packet_matrix_isvector(int p)
+{
+    VALID_MATRIX_HEADER(p, h, m, 0, 0);
+    return ((m->rows == 1) || (m->columns == 1));
+}
+
+int pdp_packet_matrix_ismatrix(int p)
+{
+    VALID_MATRIX_HEADER(p, h, m, 0, 0);
+    return ((m->rows != 1) && (m->columns != 1));
+}
+
+
+
+
+/* gsl blas matrix/vector multiplication:
+
+vector.vector
+
+ (const gsl_vector * x, const gsl_vector * y, double * result) 
+
+gsl_blas_sdot
+gsl_blas_ddot
+gsl_blas_cdot
+gsl_blas_zdot
+gsl_blas_cdotu
+gsl_blas_zdotu
+
+matrix.vector
+ (
+   CBLAS_TRANSPOSE_t 
+   TransA, 
+   double alpha, 
+   const gsl_matrix * A, 
+   const gsl_vector * x, 
+   double beta, 
+   gsl_vector * y
+ )
+
+gsl_blas_sgemv
+gsl_blas_dgemv
+gsl_blas_cgemv
+gsl_blas_zgemv
+
+matrix.matrix
+ (
+   CBLAS_TRANSPOSE_t TransA, 
+   CBLAS_TRANSPOSE_t TransB, 
+   double alpha, 
+   const gsl_matrix * A, 
+   const gsl_matrix * B, 
+   double beta, 
+   gsl_matrix * C
+ )
+
+gsl_blas_sgemm
+gsl_blas_dgemm
+gsl_blas_cgemm
+gsl_blas_zgemm
+
+*/
+
+/* compute the matrix inverse using the LU decomposition */
+/* it only works for double real/complex */
+int pdp_packet_matrix_LU_to_inverse(int p)
+{
+    int new_p;
+    u32 n;
+    int type = pdp_packet_matrix_get_type(p);
+    t_matrix *sheader = (t_matrix *)pdp_packet_subheader(p);
+    gsl_matrix *m = (gsl_matrix *)pdp_packet_matrix_get_gsl_matrix(p, type);
+    gsl_matrix *im;
+    if (!m) return -1;
+    n = m->gsl_rows; 
+    if (n != m->gsl_columns) return -1;
+    new_p = pdp_packet_new_matrix(n, n, type);
+    if (-1 == new_p) return -1;
+    im = (gsl_matrix *)pdp_packet_matrix_get_gsl_matrix(new_p, type);
+
+    switch(type){
+    case PDP_MATRIX_TYPE_RDOUBLE:
+	gsl_linalg_LU_invert (m, &sheader->perm, im); break;
+    case PDP_MATRIX_TYPE_CDOUBLE:
+	gsl_linalg_complex_LU_invert ((gsl_matrix_complex *)m, &sheader->perm, (gsl_matrix_complex *)im); break;
+    default:
+	pdp_packet_mark_unused(new_p);
+	new_p = -1;
+    }
+    return new_p;
+}
+/* compute the LU decomposition of a square matrix */
+/* it only works for double real/complex */
+int pdp_packet_matrix_LU(int p)
+{
+    int p_LU, bytes;
+    u32 n;
+    int type = pdp_packet_matrix_get_type(p);
+    t_matrix *sh_m_LU;
+    t_matrix *sh_m = (t_matrix *)pdp_packet_subheader(p);
+    gsl_matrix *m = (gsl_matrix *)pdp_packet_matrix_get_gsl_matrix(p, type);
+    gsl_matrix *m_LU;
+    if (!m) return -1;
+    n = m->gsl_rows; 
+    if (n != m->gsl_columns) return -1;
+    p_LU = pdp_packet_new_matrix(n, n, type);
+    if (-1 == p_LU) return -1;
+    sh_m_LU  = (t_matrix *)pdp_packet_subheader(p_LU);
+    m_LU = (gsl_matrix *)pdp_packet_matrix_get_gsl_matrix(p_LU, type);
+    /* copy matrix data: move this to copy method */
+    memcpy(pdp_packet_data(p_LU), pdp_packet_data(p), sh_m->block.size); 
+
+    switch(type){
+    case PDP_MATRIX_TYPE_RDOUBLE:
+	gsl_linalg_LU_decomp (m_LU, &sh_m_LU->perm, &sh_m_LU->signum); break; 
+    case PDP_MATRIX_TYPE_CDOUBLE:
+	gsl_linalg_complex_LU_decomp ((gsl_matrix_complex *)m_LU, &sh_m_LU->perm, &sh_m_LU->signum); break; 
+    default:
+	pdp_packet_mark_unused(p_LU);
+	p_LU = -1;
+    }
+    return p_LU;
+}
+
+int pdp_packet_matrix_LU_solve(int p_matrix, int p_vector)
+{
+    int type = pdp_packet_matrix_get_type(p_matrix);
+    int p_result_vector = pdp_packet_clone_rw(p_vector);
+    gsl_matrix *m = (gsl_matrix *)pdp_packet_matrix_get_gsl_matrix(p_matrix, type);
+    gsl_vector *v = (gsl_vector *)pdp_packet_matrix_get_gsl_vector(p_vector, type);
+    gsl_vector *rv = (gsl_vector *)pdp_packet_matrix_get_gsl_vector(p_result_vector, type);
+    t_matrix *sh_m = (t_matrix *)pdp_packet_subheader(p_matrix);
+
+    if (!(m && v && rv)) goto error;
+
+    switch(type){
+    case PDP_MATRIX_TYPE_RDOUBLE:
+	if (gsl_linalg_LU_solve (m, &sh_m->perm, v, rv)) goto error; break;
+    case PDP_MATRIX_TYPE_CDOUBLE:
+	if(gsl_linalg_complex_LU_solve ((gsl_matrix_complex*)m, &sh_m->perm, 
+		(gsl_vector_complex *)v, (gsl_vector_complex *)rv)) goto error; break;
+    default:
+	goto error;
+    }
+    return p_result_vector;
+
+ error:
+    pdp_packet_mark_unused(p_result_vector);
+    //post("error");
+    return -1;
+}
+
+/* matrix matrix mul: C is defining type 
+   returns 0 on success */
+int pdp_packet_matrix_blas_mm
+(
+ CBLAS_TRANSPOSE_t TransA,
+ CBLAS_TRANSPOSE_t TransB,
+ int pA,
+ int pB,
+ int pC,
+ float scale_r,
+ float scale_i
+)
+{
+    gsl_complex_float cf_scale = {{scale_r, scale_i}};
+    gsl_complex cd_scale = {{(double)scale_r, (double)scale_i}};
+    gsl_complex_float cf_one = {{1.0f, 0.0f}};
+    gsl_complex cd_one = {{1.0, 0.0}};
+    gsl_matrix *mA, *mB, *mC;
+    int type;
+    type = pdp_packet_matrix_get_type(pC);
+    mA = (gsl_matrix *)pdp_packet_matrix_get_gsl_matrix(pA,type);
+    mB = (gsl_matrix *)pdp_packet_matrix_get_gsl_matrix(pB,type);
+    mC = (gsl_matrix *)pdp_packet_matrix_get_gsl_matrix(pC,type);
+
+    if (!(mA && mB)) return 1;
+
+
+    switch(type){
+    case PDP_MATRIX_TYPE_RFLOAT:
+	return gsl_blas_sgemm(TransA, TransB, scale_r, (gsl_matrix_float *)mA, 
+			      (gsl_matrix_float *)mB, 1.0f, (gsl_matrix_float *)mC); 
+    case PDP_MATRIX_TYPE_RDOUBLE:
+	return gsl_blas_dgemm(TransA, TransB, (double)scale_r, (gsl_matrix *)mA, 
+			      (gsl_matrix *)mB, 1.0, (gsl_matrix *)mC);
+    case PDP_MATRIX_TYPE_CFLOAT:
+	return gsl_blas_cgemm(TransA, TransB, cf_scale, (gsl_matrix_complex_float *)mA, 
+			      (gsl_matrix_complex_float *)mB, cf_one, (gsl_matrix_complex_float *)mC); 
+    case PDP_MATRIX_TYPE_CDOUBLE:
+	return gsl_blas_zgemm(TransA, TransB, cd_scale, (gsl_matrix_complex *)mA, 
+			      (gsl_matrix_complex *)mB, cd_one, (gsl_matrix_complex *)mC); 
+    default:
+	return 0;
+    }
+}
+
+/* matrix vector mul: C is defining type 
+   returns 0 on success */
+int pdp_packet_matrix_blas_mv
+(
+ CBLAS_TRANSPOSE_t TransA,
+ int pA,
+ int pb,
+ int pc,
+ float scale_r,
+ float scale_i
+)
+{
+    gsl_complex_float cf_scale = {{scale_r, scale_i}};
+    gsl_complex cd_scale = {{(double)scale_r, (double)scale_i}};
+    gsl_complex_float cf_one = {{1.0f, 0.0f}};
+    gsl_complex cd_one = {{1.0, 0.0}};
+    gsl_matrix *mA;
+    gsl_vector *vb, *vc;
+    int type;
+    type = pdp_packet_matrix_get_type(pA);
+    mA = (gsl_matrix *)pdp_packet_matrix_get_gsl_matrix(pA,type);
+    vb = (gsl_vector *)pdp_packet_matrix_get_gsl_vector(pb,type);
+    vc = (gsl_vector *)pdp_packet_matrix_get_gsl_vector(pc,type);
+
+    if (!(vb && vc)) return 1;
+
+
+    switch(type){
+    case PDP_MATRIX_TYPE_RFLOAT:
+	return gsl_blas_sgemv(TransA, scale_r, (gsl_matrix_float *)mA, 
+			      (gsl_vector_float *)vb, 1.0f, (gsl_vector_float *)vc); 
+    case PDP_MATRIX_TYPE_RDOUBLE:
+	return gsl_blas_dgemv(TransA, (double)scale_r, (gsl_matrix *)mA, 
+			      (gsl_vector *)vb, 1.0, (gsl_vector *)vc);
+    case PDP_MATRIX_TYPE_CFLOAT:
+	return gsl_blas_cgemv(TransA, cf_scale, (gsl_matrix_complex_float *)mA, 
+			      (gsl_vector_complex_float *)vb, cf_one, (gsl_vector_complex_float *)vc); 
+    case PDP_MATRIX_TYPE_CDOUBLE:
+	return gsl_blas_zgemv(TransA, cd_scale, (gsl_matrix_complex *)mA, 
+			      (gsl_vector_complex *)vb, cd_one, (gsl_vector_complex *)vc); 
+    default:
+	return 0;
+    }
+}
+
+
+
+t_pdp_symbol *_pdp_matrix_get_description(t_pdp *header)
+{
+    t_matrix *m = (t_matrix *)(&header->info.raw);
+    char description[100];
+    char *c = description;
+    int encoding;
+
+    if (!header) return pdp_gensym("invalid");
+    else if (!header->desc){
+	/* if description is not defined, try to reconstruct it (for backwards compat) */
+	if (header->type == PDP_MATRIX){
+
+	    c += sprintf(c, "matrix");
+
+	    switch(m->type){
+	    case PDP_MATRIX_TYPE_RFLOAT: c += sprintf(c, "/float/real"); break;
+	    case PDP_MATRIX_TYPE_CFLOAT: c += sprintf(c, "/float/complex"); break;
+	    case PDP_MATRIX_TYPE_RDOUBLE: c += sprintf(c, "/double/real"); break;
+	    case PDP_MATRIX_TYPE_CDOUBLE: c += sprintf(c, "/double/complex"); break;
+	    default:
+		c += sprintf(c, "/unknown"); goto exit;
+	    }
+
+	    c += sprintf(c, "/%dx%d", (int)m->rows, (int)m->columns);
+	    
+	exit:
+	    return pdp_gensym(description);
+	} 
+	else return pdp_gensym("unknown");
+    }
+    else return header->desc;
+}
+
+
+
+static void _pdp_matrix_copy(t_pdp *dst, t_pdp *src);
+static void _pdp_matrix_clone(t_pdp *dst, t_pdp *src);
+static void _pdp_matrix_reinit(t_pdp *dst);
+static void _pdp_matrix_cleanup(t_pdp *dst);
+
+static size_t _pdp_matrix_mdata_byte_size(u32 rows, u32 columns, u32 type)
+{
+    size_t dsize = rows * columns;
+    switch (type){
+    case PDP_MATRIX_TYPE_RFLOAT:   dsize *= sizeof(float);    break;
+    case PDP_MATRIX_TYPE_CFLOAT:   dsize *= 2*sizeof(float);  break;
+    case PDP_MATRIX_TYPE_RDOUBLE:  dsize *= sizeof(double);   break;
+    case PDP_MATRIX_TYPE_CDOUBLE:  dsize *= 2*sizeof(double); break;
+    default: dsize = 0;
+    }
+    return dsize;
+}
+
+
+static size_t _pdp_matrix_pdata_vector_size(u32 rows, u32 columns)
+{
+    return (rows>columns ? rows : columns);
+}
+
+
+static void _pdp_matrix_init(t_pdp *dst, u32 rows, u32 columns, u32 type)
+{
+    int i;
+    t_matrix *m = (t_matrix *)(&dst->info.raw);
+    void *d = ((void *)dst) + PDP_HEADER_SIZE;
+    int matrix_bytesize = _pdp_matrix_mdata_byte_size(rows, columns, type);
+    int permsize =  _pdp_matrix_pdata_vector_size(rows, columns);
+
+    /* set meta data */
+    m->type = type;
+    m->rows = rows;
+    m->columns = columns;
+
+    /* set the block data */
+    m->block.size = matrix_bytesize;
+    m->block.data = (double *)d;
+
+    /* set the vector view */
+    m->vector.size = (1==columns) ? rows : columns;
+    m->vector.stride = 1;
+    m->vector.data = (double *)d;
+    m->vector.block = &m->block;
+    m->vector.owner = 0;
+
+    /* set the matrix view */
+    m->matrix.gsl_rows = rows;
+    m->matrix.gsl_columns = columns;
+    m->matrix.tda = columns;
+    m->matrix.data = (double *)d;
+    m->matrix.block = &m->block;
+    m->matrix.owner = 0;
+
+    /* set the permutation object & init */
+    m->perm.size = permsize;
+    m->perm.data = (size_t *)(d + matrix_bytesize);
+    for(i=0; i<permsize; i++) m->perm.data[i] = i;
+    m->signum = -1;
+    
+    /* init packet header */
+    dst->theclass = matrix_class;
+    dst->desc = _pdp_matrix_get_description(dst);
+
+}
+
+static void _pdp_matrix_clone(t_pdp *dst, t_pdp *src)
+{
+    t_matrix *m = (t_matrix *)(&src->info.raw);
+    _pdp_matrix_init(dst, m->rows, m->columns, m->type);
+
+}
+static void _pdp_matrix_copy(t_pdp *dst, t_pdp *src)
+{
+    _pdp_matrix_clone(dst, src);
+    memcpy(dst + PDP_HEADER_SIZE, src + PDP_HEADER_SIZE, src->size - PDP_HEADER_SIZE);
+    //post("matrix copy successful");
+}
+static void _pdp_matrix_reinit(t_pdp *dst)
+{
+    /* nothing to do, assuming data is correct */
+}
+static void _pdp_matrix_cleanup(t_pdp *dst)
+{
+    /* no extra memory to free */
+}
+
+int pdp_packet_new_matrix(u32 rows, u32 columns, u32 type)
+{
+    t_pdp *header;
+    int dsize, p;
+
+    /* compute the blocksize for the matrix data */
+    /* if 0, something went wrong -> return invalid packet */
+    if (!(dsize = _pdp_matrix_mdata_byte_size(rows, columns, type))) return -1;
+    dsize += sizeof(size_t) * _pdp_matrix_pdata_vector_size(rows, columns);
+
+    p = pdp_packet_new(PDP_MATRIX, dsize);
+    if (-1 == p) return -1;
+    header = pdp_packet_header(p);
+    
+    _pdp_matrix_init(header, rows, columns, type);
+
+    return p;
+}
+
+int pdp_packet_new_matrix_product_result(CBLAS_TRANSPOSE_t TransA, CBLAS_TRANSPOSE_t TransB, int pA, int pB)
+{
+    gsl_matrix *mA, *mB;
+    u32 type = pdp_packet_matrix_get_type(pA);
+
+    u32 colA, colB, rowA, rowB;
+   
+    /* check if A is a matrix */
+    if (!type) return -1;
+
+    mA = (gsl_matrix *)pdp_packet_matrix_get_gsl_matrix(pA, type);
+    mB = (gsl_matrix *)pdp_packet_matrix_get_gsl_matrix(pB, type);
+
+    /* check if A and B are same type */
+    if (!mB) return -1;
+
+    /* get dims A */
+    if (TransA == CblasNoTrans){
+	rowA = mA->gsl_rows;
+	colA = mA->gsl_columns;
+    }
+    else {
+	rowA = mA->gsl_columns;
+	colA = mA->gsl_rows;
+    }
+
+    /* get dims B */
+    if (TransB == CblasNoTrans){
+	rowB = mB->gsl_rows;
+	colB = mB->gsl_columns;
+    }
+    else {
+	rowB = mB->gsl_columns;
+	colB = mB->gsl_rows;
+    }
+
+    /* check if sizes are compatible */
+    if (colA != rowB) return -1;
+
+    /* create new packet */
+    return pdp_packet_new_matrix(rowA, colB, type);
+}
+
+void pdp_packet_matrix_setzero(int p)
+{
+    t_matrix *m;
+    if (!pdp_packet_matrix_isvalid(p)) return;
+    m = (t_matrix *) pdp_packet_subheader(p);
+    memset(m->block.data, 0, m->block.size);
+}
+
+
+
+/* type conversion programs */
+static int _pdp_packet_convert_matrix_to_greyimage(int packet, t_pdp_symbol *dest_template)
+{
+    t_pdp *header = pdp_packet_header(packet);
+    t_matrix *matrix = (t_matrix *)pdp_packet_subheader(packet);
+    void *data = pdp_packet_data(packet);
+    s16 *new_data;
+    u32 c,r, nbelements;
+    int new_p;
+    u32 i;
+
+    c = matrix->columns;
+    r = matrix->rows;
+    nbelements = c*r;
+
+    new_p = pdp_packet_new_image_grey(c,r);
+    if (-1 == new_p) return -1;
+    new_data = (s16 *)pdp_packet_data(new_p);
+
+    /* convert first channel */
+    switch(matrix->type){
+    case PDP_MATRIX_TYPE_RFLOAT:
+	for (i=0; i<nbelements; i++) (new_data)[i] = (s16)(((float *)data)[i] * (float)0x8000); break;
+    case PDP_MATRIX_TYPE_CFLOAT: //only copy real channel
+	for (i=0; i<nbelements; i++) (new_data)[i] = (s16)(((float *)data)[i<<1] * (float)0x8000); break;
+    case PDP_MATRIX_TYPE_RDOUBLE:
+	for (i=0; i<nbelements; i++) (new_data)[i] = (s16)(((double *)data)[i] * (float)0x8000); break;
+    case PDP_MATRIX_TYPE_CDOUBLE: //only copy real channel
+	for (i=0; i<nbelements; i++) (new_data)[i] = (s16)(((double *)data)[i<<1] * (float)0x8000); break;
+    default:
+	pdp_packet_mark_unused(new_p);
+	new_p = -1;
+    }	
+    return new_p;
+}
+
+static int _pdp_packet_convert_image_to_matrix(int packet, t_pdp_symbol *dest_template, int type)
+{
+    t_pdp *header = pdp_packet_header(packet);
+    t_image *image = pdp_packet_image_info(packet);
+    s16 *data = (s16 *)pdp_packet_data(packet);
+    void *new_data;
+    u32 w,h, nbelements;
+    int new_p;
+    int encoding = image->encoding;
+    u32 i;
+
+    if (!pdp_packet_image_isvalid(packet)) return -1;
+    w = image->width;
+    h = image->height;
+    nbelements = w*h;
+
+    new_p = pdp_packet_new_matrix(h,w, type);
+    if (-1 == new_p) return -1;
+    new_data = pdp_packet_data(new_p);
+
+    switch (encoding){
+    case PDP_IMAGE_YV12:
+    case PDP_IMAGE_GREY:
+    case PDP_IMAGE_MCHP:
+	/* convert first channel */
+	switch(type){
+	case PDP_MATRIX_TYPE_RFLOAT:
+	    for (i=0; i<nbelements; i++)
+		((float *)new_data)[i] = ((float)data[i]) * (1.0f / (float)0x8000); break;
+	case PDP_MATRIX_TYPE_RDOUBLE:
+	    for (i=0; i<nbelements; i++)
+		((double *)new_data)[i] = ((double)data[i]) * (1.0f / (double)0x8000); break;
+	case PDP_MATRIX_TYPE_CFLOAT:
+	    for (i=0; i<nbelements; i++){
+		((float *)new_data)[i*2] = ((float)data[i]) * (1.0f / (float)0x8000); 
+		((float *)new_data)[i*2+1] = 0.0f;
+	    }
+	    break;
+	case PDP_MATRIX_TYPE_CDOUBLE:
+	    for (i=0; i<nbelements; i++){
+		((double *)new_data)[i*2] = ((double)data[i]) * (1.0f / (double)0x8000); 
+		((double *)new_data)[i*2+1] = 0.0;
+	    }
+	    break;
+	default:
+	    post("_pdp_packet_convert_image_to_matrix: INTERNAL ERROR");
+	}
+	break;
+    default:
+	pdp_packet_mark_unused(new_p);
+	new_p = -1;
+	break;
+    }
+
+    return new_p;
+
+}
+
+static int _pdp_packet_convert_image_to_floatmatrix(int packet, t_pdp_symbol *dest_template){
+    return _pdp_packet_convert_image_to_matrix(packet, dest_template, PDP_MATRIX_TYPE_RFLOAT);}
+static int _pdp_packet_convert_image_to_doublematrix(int packet, t_pdp_symbol *dest_template){
+    return _pdp_packet_convert_image_to_matrix(packet, dest_template, PDP_MATRIX_TYPE_RDOUBLE);}
+static int _pdp_packet_convert_image_to_complexfloatmatrix(int packet, t_pdp_symbol *dest_template){
+    return _pdp_packet_convert_image_to_matrix(packet, dest_template, PDP_MATRIX_TYPE_CFLOAT);}
+static int _pdp_packet_convert_image_to_complexdoublematrix(int packet, t_pdp_symbol *dest_template){
+    return _pdp_packet_convert_image_to_matrix(packet, dest_template, PDP_MATRIX_TYPE_CDOUBLE);}
+
+
+static int _pdp_packet_matrix_convert_fallback(int packet, t_pdp_symbol *dest_template)
+{
+    post("can't convert image type %s to %s",
+	 pdp_packet_get_description(packet)->s_name, dest_template->s_name);
+
+    return -1;
+}
+
+
+/* this seems like a nice spot to place a dummy gsl signal handler */
+static void _gsl_error_handler (const char * reason, 
+              const char * file, 
+              int line, 
+              int gsl_errno)
+{
+    //post("gsl error:\nREASON: %s\nFILE:%s\nLINE:%d\nERRNO:%d", reason, file, line, gsl_errno);
+}
+
+static int pdp_matrix_factory(t_pdp_symbol *type)
+{
+    return -1;
+}
+void pdp_matrix_setup(void)
+{
+    t_pdp_conversion_program *program;
+
+
+    /* setup the class */
+    matrix_class = pdp_class_new(pdp_gensym("matrix/*/*/*"), pdp_matrix_factory);
+    matrix_class->copy = _pdp_matrix_copy;
+    matrix_class->clone = _pdp_matrix_clone;
+    matrix_class->reinit = _pdp_matrix_reinit;
+    matrix_class->cleanup = _pdp_matrix_cleanup;
+    
+
+    /* image -> matrix: default = double/real (most ops available) */
+    program = pdp_conversion_program_new(_pdp_packet_convert_image_to_doublematrix, 0);
+    pdp_type_register_conversion(pdp_gensym("image/*/*"), pdp_gensym("matrix/double/real/*"), program);
+    program = pdp_conversion_program_new(_pdp_packet_convert_image_to_floatmatrix, 0);
+    pdp_type_register_conversion(pdp_gensym("image/*/*"), pdp_gensym("matrix/float/real/*"), program);
+    program = pdp_conversion_program_new(_pdp_packet_convert_image_to_complexdoublematrix, 0);
+    pdp_type_register_conversion(pdp_gensym("image/*/*"), pdp_gensym("matrix/double/complex/*"), program);
+    program = pdp_conversion_program_new(_pdp_packet_convert_image_to_complexfloatmatrix, 0);
+    pdp_type_register_conversion(pdp_gensym("image/*/*"), pdp_gensym("matrix/float/complex/*"), program);
+
+    /* matrix -> image */
+    program = pdp_conversion_program_new(_pdp_packet_convert_matrix_to_greyimage, 0);
+    pdp_type_register_conversion(pdp_gensym("matrix/*/*/*"), pdp_gensym("image/grey/*"), program);
+
+    /* fallbacks */
+    program = pdp_conversion_program_new(_pdp_packet_matrix_convert_fallback, 0);
+    pdp_type_register_conversion(pdp_gensym("matrix/*/*/*"), pdp_gensym("image/*/*"), program);
+    pdp_type_register_conversion(pdp_gensym("matrix/*/*/*"), pdp_gensym("bitmap/*/*"), program);
+    pdp_type_register_conversion(pdp_gensym("image/*/*"), pdp_gensym("matrix/*/*/*/*"), program);
+    pdp_type_register_conversion(pdp_gensym("bitmap/*/*"), pdp_gensym("matrix/*/*/*/*"), program);
+
+    /* setup gsl handler */
+    if(gsl_set_error_handler(_gsl_error_handler)){
+	post("pdp_matrix_setup: WARNING: overriding gsl error handler.");
+    }    
+
+}