From 4cbd55491dd86ea99e1ea8190a20bd13e0f328ae Mon Sep 17 00:00:00 2001
From: Miller Puckette <millerpuckette@users.sourceforge.net>
Date: Sat, 16 Jul 2005 01:43:18 +0000
Subject: fixed bugs, adopted some patches.

svn path=/trunk/; revision=3347
---
 pd/src/s_midi_alsa.c | 233 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 233 insertions(+)
 create mode 100644 pd/src/s_midi_alsa.c

(limited to 'pd/src/s_midi_alsa.c')

diff --git a/pd/src/s_midi_alsa.c b/pd/src/s_midi_alsa.c
new file mode 100644
index 00000000..437ac792
--- /dev/null
+++ b/pd/src/s_midi_alsa.c
@@ -0,0 +1,233 @@
+/* Copyright (c) 1997-1999 Guenter Geiger, Miller Puckette, Larry Troxler,
+* Winfried Ritsch, Karl MacMillan, and others.
+* For information on usage and redistribution, and for a DISCLAIMER OF ALL
+* WARRANTIES, see the file, "LICENSE.txt," in this distribution.  */
+
+/* MIDI I/O for Linux using ALSA */
+
+#include <stdio.h>
+#ifdef UNISTD
+#include <unistd.h>
+#endif
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <alsa/asoundlib.h>
+#include "m_pd.h"
+#include "s_stuff.h"
+
+static int alsa_nmidiin;
+static int alsa_midiinfd[MAXMIDIINDEV];
+static int alsa_nmidiout;
+static int alsa_midioutfd[MAXMIDIOUTDEV];
+
+static snd_seq_t *midi_handle;
+
+static snd_midi_event_t *midiev;
+
+
+
+static unsigned short CombineBytes(unsigned char First, unsigned char Second)
+{
+    unsigned short _14bit;
+    _14bit = (unsigned short)Second;
+    _14bit <<= 7;
+    _14bit |= (unsigned short)First;
+    return(_14bit);
+}
+
+void sys_alsa_do_open_midi(int nmidiin, int *midiinvec,
+    int nmidiout, int *midioutvec)
+{
+
+    char portname[50];
+    int err = 0;
+    int client;
+    int i;
+    alsa_nmidiin = 0;
+    alsa_nmidiout = 0;
+
+    if (nmidiin>0 && nmidiout>0)
+        err = snd_seq_open(&midi_handle,"default",SND_SEQ_OPEN_DUPLEX,0);
+    else if (nmidiin > 0)
+        err = snd_seq_open(&midi_handle,"default",SND_SEQ_OPEN_INPUT,0);
+    else if (nmidiout > 0)
+        err = snd_seq_open(&midi_handle,"default",SND_SEQ_OPEN_OUTPUT,0);
+    
+    if (err!=0)
+    {
+            sys_setalarm(1000000);
+            post("couldn't open alsa sequencer");
+            return;
+    }
+    for (i=0;i<nmidiout;i++)
+    {
+        int port;
+        sprintf(portname,"Pure Data Midi-In %d",i+1);
+        port = snd_seq_create_simple_port(midi_handle,portname,SND_SEQ_PORT_CAP_WRITE |SND_SEQ_PORT_CAP_SUBS_WRITE , SND_SEQ_PORT_TYPE_APPLICATION);
+        alsa_midiinfd[i] = port;        
+        if (port < 0) goto error;        
+    }
+
+    for (i=0;i<nmidiin;i++)
+    {
+        int port;
+        sprintf(portname,"Pure Data Midi-Out %d",i+1);
+        port = snd_seq_create_simple_port(midi_handle,portname,  SND_SEQ_PORT_CAP_SUBS_READ |  SND_SEQ_PORT_CAP_READ, SND_SEQ_PORT_TYPE_APPLICATION);
+        alsa_midioutfd[i] = port;       
+        if (port < 0) goto error;        
+    }
+   
+    if (nmidiout == 0 && nmidiin == 0) return;
+    snd_seq_client_info_t *alsainfo;
+    snd_seq_client_info_malloc(&alsainfo);
+    snd_seq_get_client_info(midi_handle,alsainfo);
+    snd_seq_client_info_set_name(alsainfo,"Pure Data");
+    client = snd_seq_client_info_get_client(alsainfo);
+    snd_seq_set_client_info(midi_handle,alsainfo);
+    snd_seq_client_info_free(alsainfo);
+    post("Opened Alsa Client %d in:%d out:%d",client,nmidiin,nmidiout);
+    sys_setalarm(0);
+    snd_midi_event_new(20,&midiev);
+    alsa_nmidiout = nmidiout;
+    alsa_nmidiin = nmidiin;
+    return;
+  error:
+    sys_setalarm(1000000);
+    post("couldn't open alsa MIDI output device");
+    return;
+}
+
+#define md_msglen(x) (((x)<0xC0)?2:((x)<0xE0)?1:((x)<0xF0)?2:\
+    ((x)==0xF2)?2:((x)<0xF4)?1:0)
+
+void sys_alsa_putmidimess(int portno, int a, int b, int c)
+{
+    int channel;
+    snd_seq_event_t ev;
+    snd_seq_ev_clear(&ev);
+    if (portno >= 0 && portno < alsa_nmidiout)
+    {
+        if (a >= 224)   // pitchbend
+        {
+            channel = a-224;
+            snd_seq_ev_set_pitchbend(&ev,channel,CombineBytes(b,c));
+        }
+        else if (a >= 208)      // touch
+        {
+            channel = a-208;
+            snd_seq_ev_set_chanpress(&ev,channel,b);
+        }
+        else if (a >= 192)      // program
+        {
+            channel = a-192;
+            snd_seq_ev_set_pgmchange(&ev,channel,b);
+        }
+        else if (a >= 176)      // controller
+        {
+            channel = a-176;
+            snd_seq_ev_set_controller(&ev,channel,b,c);
+        }
+        else if (a >= 160)      // polytouch
+        {
+            channel = a-160;
+            snd_seq_ev_set_keypress(&ev,channel,b,c);
+        }
+        else if (a >= 144)      // note
+        {
+            channel = a-144;
+            if (c)
+                snd_seq_ev_set_noteon(&ev,channel,b,c);
+            else
+                snd_seq_ev_set_noteoff(&ev,channel,b,c);
+        }
+        snd_seq_ev_set_direct(&ev);
+        snd_seq_ev_set_subs(&ev);
+        snd_seq_ev_set_source(&ev,alsa_midioutfd[portno]);
+        snd_seq_event_output_direct(midi_handle,&ev);
+    }
+    //post("%d %d %d\n",a,b,c);
+}
+
+void sys_alsa_putmidibyte(int portno, int byte)
+{
+    snd_seq_event_t ev;
+    snd_seq_ev_clear(&ev);
+    if (portno >= 0 && portno < alsa_nmidiout)
+    {
+        // repack into 1 byte char and put somewhere to point at
+        unsigned char data = (unsigned char)byte;
+        unsigned char *dataptr = malloc(1);
+        memcpy(dataptr,&byte,1);
+
+        snd_seq_ev_set_sysex(&ev,1,dataptr); //...set_variable *should* have worked but didn't
+        snd_seq_ev_set_direct(&ev);
+        snd_seq_ev_set_subs(&ev);
+        snd_seq_ev_set_source(&ev,alsa_midioutfd[portno]);
+        snd_seq_event_output_direct(midi_handle,&ev);
+    }
+}
+
+
+    /* this version uses the asynchronous "read()" ... */
+void sys_alsa_poll_midi(void)
+{
+   char buf[20];
+   int count, alsa_source;
+   int i;
+   snd_seq_event_t *midievent = NULL;
+
+   if (alsa_nmidiout == 0 && alsa_nmidiin == 0) return;
+   
+   snd_midi_event_init(midiev);
+
+   if (!alsa_nmidiout && !alsa_nmidiin) return;
+   count = snd_seq_event_input_pending(midi_handle,1);
+   if (count != 0)
+        count = snd_seq_event_input(midi_handle,&midievent);
+   if (midievent != NULL)
+   {
+       count = snd_midi_event_decode(midiev,buf,20,midievent);
+       alsa_source = midievent->dest.port;
+       for(i=0;i<count;i++)
+           sys_midibytein(alsa_source, (buf[i] & 0xff));
+       //post("received %d midi bytes\n",count);
+   }
+}
+
+void sys_alsa_close_midi()
+{
+    alsa_nmidiin = alsa_nmidiout = 0;
+    snd_seq_close(midi_handle);
+    snd_midi_event_free(midiev);
+}
+
+#define NSEARCH 10
+static int alsa_nmidiindevs, alsa_nmidioutdevs, alsa_initted;
+
+void midi_alsa_init(void)     
+{
+    int i;
+    if (alsa_initted)
+        return;
+    alsa_initted = 1;
+}
+
+void midi_alsa_getdevs(char *indevlist, int *nindevs,
+    char *outdevlist, int *noutdevs, int maxndev, int devdescsize)
+{
+    int i, ndev;
+    if ((ndev = alsa_nmidiindevs) > maxndev)
+        ndev = maxndev;
+    for (i = 0; i < ndev; i++)
+        sprintf(indevlist + i * devdescsize, "ALSA MIDI device #%d", i+1);
+    *nindevs = ndev;
+
+    if ((ndev = alsa_nmidioutdevs) > maxndev)
+        ndev = maxndev;
+    for (i = 0; i < ndev; i++)
+        sprintf(outdevlist + i * devdescsize, "ALSA MIDI device #%d", i+1);
+    *noutdevs = ndev;
+}
-- 
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