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Diffstat (limited to 'nusmuk-audio/tabread4c~.c')
| -rw-r--r-- | nusmuk-audio/tabread4c~.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/nusmuk-audio/tabread4c~.c b/nusmuk-audio/tabread4c~.c new file mode 100644 index 0000000..c4a7804 --- /dev/null +++ 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); +} |