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svn path=/trunk/externals/nusmuk/; revision=14367

1 files changed, 244 insertions, 0 deletions

diff --git a/nusmuk-audio/tabosc4c~.c b/nusmuk-audio/tabosc4c~.c
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+++ b/nusmuk-audio/tabosc4c~.c
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+// tabosc4c~
+// can replace with tabosc4~
+// most of this code comes from pd. just the interpolation shematic is diferent.
+
+/* 
+This software is copyrighted by Miller Puckette and others.  The following
+terms (the "Standard Improved BSD License") apply to all files associated with
+the software unless explicitly disclaimed in individual files:
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above  
+   copyright notice, this list of conditions and the following 
+   disclaimer in the documentation and/or other materials provided
+   with the distribution.
+3. The name of the author may not be used to endorse or promote
+   products derived from this software without specific prior 
+   written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
+EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR
+BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,   
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+// Cyrille Henry 06 2008
+
+
+#include "m_pd.h"
+
+/******************** tabosc4c~ ***********************/
+
+/* this is all copied from d_osc.c... what include file could this go in? */
+#define UNITBIT32 1572864.  /* 3*2^19; bit 32 has place value 1 */
+
+    /* machine-dependent definitions.  These ifdefs really
+    should have been by CPU type and not by operating system! */
+#ifdef IRIX
+    /* big-endian.  Most significant byte is at low address in memory */
+#define HIOFFSET 0    /* word offset to find MSB */
+#define LOWOFFSET 1    /* word offset to find LSB */
+#define int32 long  /* a data type that has 32 bits */
+#endif /* IRIX */
+
+#ifdef MSW
+    /* little-endian; most significant byte is at highest address */
+#define HIOFFSET 1
+#define LOWOFFSET 0
+#define int32 long
+#endif
+
+#if defined(__FreeBSD__) || defined(__APPLE__)
+#include <machine/endian.h>
+#endif
+
+#ifdef __linux__
+#include <endian.h>
+#endif
+
+#if defined(__unix__) || defined(__APPLE__)
+#if !defined(BYTE_ORDER) || !defined(LITTLE_ENDIAN)                         
+#error No byte order defined                                                    
+#endif                                                                          
+
+#if BYTE_ORDER == LITTLE_ENDIAN                                             
+#define HIOFFSET 1                                                              
+#define LOWOFFSET 0                                                             
+#else                                                                           
+#define HIOFFSET 0    /* word offset to find MSB */                             
+#define LOWOFFSET 1    /* word offset to find LSB */                            
+#endif /* __BYTE_ORDER */                                                       
+#include <sys/types.h>
+#define int32 int32_t
+#endif /* __unix__ or __APPLE__*/
+
+union tabfudge
+{
+    double tf_d;
+    int32 tf_i[2];
+};
+
+static t_class *tabosc4c_tilde_class;
+
+typedef struct _tabosc4c_tilde
+{
+    t_object x_obj;
+    t_float x_fnpoints;
+    t_float x_finvnpoints;
+    t_word *x_vec;
+    t_symbol *x_arrayname;
+    t_float x_f;
+    double x_phase;
+    t_float x_conv;
+} t_tabosc4c_tilde;
+
+static void *tabosc4c_tilde_new(t_symbol *s)
+{
+    t_tabosc4c_tilde *x = (t_tabosc4c_tilde *)pd_new(tabosc4c_tilde_class);
+    x->x_arrayname = s;
+    x->x_vec = 0;
+    x->x_fnpoints = 512.;
+    x->x_finvnpoints = (1./512.);
+    outlet_new(&x->x_obj, gensym("signal"));
+    inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft1"));
+    x->x_f = 0;
+    return (x);
+}
+
+static t_int *tabosc4c_tilde_perform(t_int *w)
+{
+    t_tabosc4c_tilde *x = (t_tabosc4c_tilde *)(w[1]);
+    t_sample *in = (t_sample *)(w[2]);
+    t_sample *out = (t_sample *)(w[3]);
+    int n = (int)(w[4]);
+    int normhipart;
+    union tabfudge tf;
+    double a3,a1,a2; // CH : for the interpolation
+    t_float fnpoints = x->x_fnpoints;
+    int mask = fnpoints - 1;
+    t_float conv = fnpoints * x->x_conv;
+    int maxindex;
+    t_word *tab = x->x_vec, *addr;
+    int i;
+    double dphase = fnpoints * x->x_phase + UNITBIT32;
+
+    if (!tab) goto zero;
+    tf.tf_d = UNITBIT32;
+    normhipart = tf.tf_i[HIOFFSET];
+
+    while (n--)
+    {
+        t_sample frac,  a,  b,  c,  d, cminusb;
+        tf.tf_d = dphase;
+        dphase += *in++ * conv;
+        addr = tab + (tf.tf_i[HIOFFSET] & mask);
+        tf.tf_i[HIOFFSET] = normhipart;
+        frac = tf.tf_d - UNITBIT32;
+        a = addr[0].w_float;
+        b = addr[1].w_float;
+        c = addr[2].w_float;
+        d = addr[3].w_float;
+//        cminusb = c-b;
+//        *out++ = b + frac * (
+//			cminusb - 0.1666667f * (1.-frac) * ( 
+//				(d - a - 3.0f * cminusb) * frac + (d + 2.0f*a - 3.0f*b) ) );
+// CH
+//	a0 = d - c - a + b;
+//	a1 = a - b - a0;
+//	a2 = c - a;
+//    *out++ = ((a0*frac+a1)*frac+a2)*frac+b;
+
+	// 4-point, 3rd-order Hermite (x-form)
+	a1 = 0.5f * (c - a);
+	a2 = a - 2.5 * b + 2.f * c - 0.5f * d;
+	a3 = 0.5f * (d - a) + 1.5f * (b - c);
+
+	*out++ =  ((a3 * frac + a2) * frac + a1) * frac + b;
+    }
+
+
+    tf.tf_d = UNITBIT32 * fnpoints;
+    normhipart = tf.tf_i[HIOFFSET];
+    tf.tf_d = dphase + (UNITBIT32 * fnpoints - UNITBIT32);
+    tf.tf_i[HIOFFSET] = normhipart;
+    x->x_phase = (tf.tf_d - UNITBIT32 * fnpoints)  * x->x_finvnpoints;
+    return (w+5);
+ zero:
+    while (n--) *out++ = 0;
+
+    return (w+5);
+}
+
+void tabosc4c_tilde_set(t_tabosc4c_tilde *x, t_symbol *s)
+{
+    t_garray *a;
+    int npoints, pointsinarray;
+
+    x->x_arrayname = s;
+    if (!(a = (t_garray *)pd_findbyclass(x->x_arrayname, garray_class)))
+    {
+        if (*s->s_name)
+            pd_error(x, "tabosc4c~: %s: no such array", x->x_arrayname->s_name);
+        x->x_vec = 0;
+    }
+    else if (!garray_getfloatwords(a, &pointsinarray, &x->x_vec))
+    {
+        pd_error(x, "%s: bad template for tabosc4c~", x->x_arrayname->s_name);
+        x->x_vec = 0;
+    }
+    else if ((npoints = pointsinarray - 3) != (1 << ilog2(pointsinarray - 3)))
+    {
+        pd_error(x, "%s: number of points (%d) not a power of 2 plus three",
+            x->x_arrayname->s_name, pointsinarray);
+        x->x_vec = 0;
+        garray_usedindsp(a);
+    }
+    else
+    {
+        x->x_fnpoints = npoints;
+        x->x_finvnpoints = 1./npoints;
+        garray_usedindsp(a);
+    }
+}
+
+static void tabosc4c_tilde_ft1(t_tabosc4c_tilde *x, t_float f)
+{
+    x->x_phase = f;
+}
+
+static void tabosc4c_tilde_dsp(t_tabosc4c_tilde *x, t_signal **sp)
+{
+    x->x_conv = 1. / sp[0]->s_sr;
+    tabosc4c_tilde_set(x, x->x_arrayname);
+
+    dsp_add(tabosc4c_tilde_perform, 4, x,
+        sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
+}
+
+void tabosc4c_tilde_setup(void)
+{
+    tabosc4c_tilde_class = class_new(gensym("tabosc4c~"),
+        (t_newmethod)tabosc4c_tilde_new, 0,
+        sizeof(t_tabosc4c_tilde), 0, A_DEFSYM, 0);
+    CLASS_MAINSIGNALIN(tabosc4c_tilde_class, t_tabosc4c_tilde, x_f);
+    class_addmethod(tabosc4c_tilde_class, (t_method)tabosc4c_tilde_dsp,
+        gensym("dsp"), 0);
+    class_addmethod(tabosc4c_tilde_class, (t_method)tabosc4c_tilde_set,
+        gensym("set"), A_SYMBOL, 0);
+    class_addmethod(tabosc4c_tilde_class, (t_method)tabosc4c_tilde_ft1,
+        gensym("ft1"), A_FLOAT, 0);
+}
+