From 577ac6e80ff4f436fbd054291ed7dddbc31bd49a Mon Sep 17 00:00:00 2001 From: Hans-Christoph Steiner Date: Tue, 18 May 2004 21:33:33 +0000 Subject: This commit was generated by cvs2svn to compensate for changes in r1738, which included commits to RCS files with non-trunk default branches. svn path=/trunk/externals/iemlib/; revision=1739 --- src/iemlib2/sigm2f.c | 127 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 127 insertions(+) create mode 100644 src/iemlib2/sigm2f.c (limited to 'src/iemlib2/sigm2f.c') diff --git a/src/iemlib2/sigm2f.c b/src/iemlib2/sigm2f.c new file mode 100644 index 0000000..f623905 --- /dev/null +++ b/src/iemlib2/sigm2f.c @@ -0,0 +1,127 @@ +/* Copyright (c) 1997-2003 Miller Puckette. +* For information on usage and redistribution, and for a DISCLAIMER OF ALL +* WARRANTIES, see the file, "LICENSE.txt," in this distribution. + +iemlib2 written by Thomas Musil (c) IEM KUG Graz Austria 2000 - 2003 */ + +#ifdef NT +#pragma warning( disable : 4244 ) +#pragma warning( disable : 4305 ) +#endif + +#include "m_pd.h" +#include "iemlib.h" +#include +#include +#include +#include + +/* ------------------------ m2f~ ----------------------------- */ + +#define M2FTABSIZE 2048 + +float *iem_m2f_table=(float *)0L; + +static t_class *sigm2f_class; + +typedef struct _sigm2f +{ + t_object x_obj; + float x_msi; +} t_sigm2f; + +static void *sigm2f_new(void) +{ + t_sigm2f *x = (t_sigm2f *)pd_new(sigm2f_class); + outlet_new(&x->x_obj, gensym("signal")); + x->x_msi = 0; + return (x); +} + +static t_int *sigm2f_perform(t_int *w) +{ + t_float *in = (t_float *)(w[1]); + t_float *out = (t_float *)(w[2]); + t_sigm2f *x = (t_sigm2f *)(w[3]); + int n = (int)(w[4]); + float *tab = iem_m2f_table, *addr, f1, f2, frac, iinn; + double dphase; + int normhipart; + union tabfudge tf; + + tf.tf_d = UNITBIT32; + normhipart = tf.tf_i[HIOFFSET]; + +#if 0 /* this is the readable version of the code. */ + while (n--) + { + iinn = (*in++)*10.0+670.0; + dphase = (double)iinn + UNITBIT32; + tf.tf_d = dphase; + addr = tab + (tf.tf_i[HIOFFSET] & (M2FTABSIZE-1)); + tf.tf_i[HIOFFSET] = normhipart; + frac = tf.tf_d - UNITBIT32; + f1 = addr[0]; + f2 = addr[1]; + *out++ = f1 + frac * (f2 - f1); + } +#endif +#if 1 /* this is the same, unwrapped by hand. */ + iinn = (*in++)*10.0+670.0; + dphase = (double)iinn + UNITBIT32; + tf.tf_d = dphase; + addr = tab + (tf.tf_i[HIOFFSET] & (M2FTABSIZE-1)); + tf.tf_i[HIOFFSET] = normhipart; + while (--n) + { + iinn = (*in++)*10.0+670.0; + dphase = (double)iinn + UNITBIT32; + frac = tf.tf_d - UNITBIT32; + tf.tf_d = dphase; + f1 = addr[0]; + f2 = addr[1]; + addr = tab + (tf.tf_i[HIOFFSET] & (M2FTABSIZE-1)); + *out++ = f1 + frac * (f2 - f1); + tf.tf_i[HIOFFSET] = normhipart; + } + frac = tf.tf_d - UNITBIT32; + f1 = addr[0]; + f2 = addr[1]; + *out++ = f1 + frac * (f2 - f1); +#endif + return (w+5); +} + +static void sigm2f_dsp(t_sigm2f *x, t_signal **sp) +{ + dsp_add(sigm2f_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, sp[0]->s_n); +} + +static void sigm2f_maketable(void) +{ + union tabfudge tf; + + if(!iem_m2f_table) + { + int i; + float *fp, midi, refexp=440.0*exp(-5.75*log(2.0)); + + iem_m2f_table = (float *)getbytes(sizeof(float) * (M2FTABSIZE+1)); + for(i=0, fp=iem_m2f_table, midi=-67.0; i<=M2FTABSIZE; i++, fp++, midi+=0.1) + *fp = refexp * exp(0.057762265047 * midi); + } + tf.tf_d = UNITBIT32 + 0.5; + if((unsigned)tf.tf_i[LOWOFFSET] != 0x80000000) + bug("m2f~: unexpected machine alignment"); +} + +void sigm2f_setup(void) +{ + sigm2f_class = class_new(gensym("m2f~"), (t_newmethod)sigm2f_new, 0, + sizeof(t_sigm2f), 0, 0); + CLASS_MAINSIGNALIN(sigm2f_class, t_sigm2f, x_msi); + class_addmethod(sigm2f_class, (t_method)sigm2f_dsp, gensym("dsp"), 0); + sigm2f_maketable(); + class_sethelpsymbol(sigm2f_class, gensym("iemhelp/help-m2f~")); +} + -- cgit v1.2.1