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+// 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);
+}