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

1 files changed, 176 insertions, 0 deletions

diff --git a/nusmuk-audio/tabread4c~.c b/nusmuk-audio/tabread4c~.c
new file mode 100644
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+++ b/nusmuk-audio/tabread4c~.c
@@ -0,0 +1,176 @@
+// tabread4c~
+// can replace tabread4c~
+// 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"
+
+/******************** tabread4c~ ***********************/
+
+static t_class *tabread4c_tilde_class;
+
+typedef struct _tabread4c_tilde
+{
+    t_object x_obj;
+    int x_npoints;
+    t_word *x_vec;
+    t_symbol *x_arrayname;
+    t_float x_f;
+} t_tabread4c_tilde;
+
+static void *tabread4c_tilde_new(t_symbol *s)
+{
+    t_tabread4c_tilde *x = (t_tabread4c_tilde *)pd_new(tabread4c_tilde_class);
+    x->x_arrayname = s;
+    x->x_vec = 0;
+    outlet_new(&x->x_obj, gensym("signal"));
+    x->x_f = 0;
+    return (x);
+}
+
+static t_int *tabread4c_tilde_perform(t_int *w)
+{
+    t_tabread4c_tilde *x = (t_tabread4c_tilde *)(w[1]);
+    t_sample *in = (t_sample *)(w[2]);
+    t_sample *out = (t_sample *)(w[3]);
+    int n = (int)(w[4]);    
+    int maxindex;
+    t_word *buf = x->x_vec, *wp;
+    int i;
+    double a3,a1,a2; // CH
+    
+    maxindex = x->x_npoints - 3;
+
+    if (!buf) goto zero;
+
+#if 0       /* test for spam -- I'm not ready to deal with this */
+    for (i = 0,  xmax = 0, xmin = maxindex,  fp = in1; i < n; i++,  fp++)
+    {
+        t_sample f = *in1;
+        if (f < xmin) xmin = f;
+        else if (f > xmax) xmax = f;
+    }
+    if (xmax < xmin + x->c_maxextent) xmax = xmin + x->c_maxextent;
+    for (i = 0, splitlo = xmin+ x->c_maxextent, splithi = xmax - x->c_maxextent,
+        fp = in1; i < n; i++,  fp++)
+    {
+        t_sample f = *in1;
+        if (f > splitlo && f < splithi) goto zero;
+    }
+#endif
+
+    for (i = 0; i < n; i++)
+    {
+        t_sample findex = *in++;
+        int index = findex;
+        t_sample frac,  a,  b,  c,  d, cminusb;
+        static int count;
+        if (index < 1)
+            index = 1, frac = 0;
+        else if (index > maxindex)
+            index = maxindex, frac = 1;
+        else frac = findex - index;
+        wp = buf + index;
+        a = wp[-1].w_float;
+        b = wp[0].w_float;
+        c = wp[1].w_float;
+        d = wp[2].w_float;
+        /* if (!i && !(count++ & 1023))
+            post("fp = %lx,  shit = %lx,  b = %f",  fp, buf->b_shit,  b); */
+//        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
+	// 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;     
+    }
+    return (w+5);
+ zero:
+    while (n--) *out++ = 0;
+
+    return (w+5);
+}
+
+void tabread4c_tilde_set(t_tabread4c_tilde *x, t_symbol *s)
+{
+    t_garray *a;
+    
+    x->x_arrayname = s;
+    if (!(a = (t_garray *)pd_findbyclass(x->x_arrayname, garray_class)))
+    {
+        if (*s->s_name)
+            pd_error(x, "tabread4c~: %s: no such array", x->x_arrayname->s_name);
+        x->x_vec = 0;
+    }
+    else if (!garray_getfloatwords(a, &x->x_npoints, &x->x_vec))
+    {
+        pd_error(x, "%s: bad template for tabread4c~", x->x_arrayname->s_name);
+        x->x_vec = 0;
+    }
+    else garray_usedindsp(a);
+}
+
+static void tabread4c_tilde_dsp(t_tabread4c_tilde *x, t_signal **sp)
+{
+    tabread4c_tilde_set(x, x->x_arrayname);
+
+    dsp_add(tabread4c_tilde_perform, 4, x,
+        sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
+
+}
+
+static void tabread4c_tilde_free(t_tabread4c_tilde *x)
+{
+}
+
+void tabread4c_tilde_setup(void)
+{
+    tabread4c_tilde_class = class_new(gensym("tabread4c~"),
+        (t_newmethod)tabread4c_tilde_new, (t_method)tabread4c_tilde_free,
+        sizeof(t_tabread4c_tilde), 0, A_DEFSYM, 0);
+    CLASS_MAINSIGNALIN(tabread4c_tilde_class, t_tabread4c_tilde, x_f);
+    class_addmethod(tabread4c_tilde_class, (t_method)tabread4c_tilde_dsp,
+        gensym("dsp"), 0);
+    class_addmethod(tabread4c_tilde_class, (t_method)tabread4c_tilde_set,
+        gensym("set"), A_SYMBOL, 0);
+}