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authormusil <tmusil@users.sourceforge.net>2006-11-08 10:48:53 +0000
committermusil <tmusil@users.sourceforge.net>2006-11-08 10:48:53 +0000
commitc1234e5a090e4229f5edfc677f6e33beb773b1a8 (patch)
treeffc5a276b0234df605db8c61d8c70fbf9dc7d9a1 /src/iemlib2/m2f~.c
parentee18c8469c8ca5f458f903f5b5c5b79a7406185d (diff)
changed sig* to *_tilde
svn path=/trunk/externals/iemlib/; revision=6229
Diffstat (limited to 'src/iemlib2/m2f~.c')
-rw-r--r--src/iemlib2/m2f~.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/src/iemlib2/m2f~.c b/src/iemlib2/m2f~.c
new file mode 100644
index 0000000..7139d87
--- /dev/null
+++ b/src/iemlib2/m2f~.c
@@ -0,0 +1,119 @@
+/* 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, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
+
+
+#include "m_pd.h"
+#include "iemlib.h"
+#include <math.h>
+
+/* ----------- m2f~ ----------- */
+/* --------- obsolete --------- */
+
+#define M2FTABSIZE 2048
+
+t_float *iem_m2f_tilde_table=(t_float *)0L;
+
+static t_class *m2f_tilde_class;
+
+typedef struct _m2f
+{
+ t_object x_obj;
+ t_float x_msi;
+} t_m2f_tilde;
+
+static void *m2f_new(void)
+{
+ t_m2f_tilde *x = (t_m2f_tilde *)pd_new(m2f_tilde_class);
+ outlet_new(&x->x_obj, gensym("signal"));
+ x->x_msi = 0;
+ return (x);
+}
+
+static t_int *m2f_perform(t_int *w)
+{
+ t_float *in = (t_float *)(w[1]);
+ t_float *out = (t_float *)(w[2]);
+ t_m2f_tilde *x = (t_m2f_tilde *)(w[3]);
+ int n = (int)(w[4]);
+ t_float *tab = iem_m2f_tilde_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 m2f_dsp(t_m2f_tilde *x, t_signal **sp)
+{
+ dsp_add(m2f_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, sp[0]->s_n);
+}
+
+static void m2f_maketable(void)
+{
+ union tabfudge tf;
+
+ if(!iem_m2f_tilde_table)
+ {
+ int i;
+ t_float *fp, midi, refexp=440.0*exp(-5.75*log(2.0));
+
+ iem_m2f_tilde_table = (t_float *)getbytes(sizeof(t_float) * (M2FTABSIZE+1));
+ for(i=0, fp=iem_m2f_tilde_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 m2f_tilde_setup(void)
+{
+ m2f_tilde_class = class_new(gensym("m2f~"), (t_newmethod)m2f_new, 0,
+ sizeof(t_m2f_tilde), 0, 0);
+ CLASS_MAINSIGNALIN(m2f_tilde_class, t_m2f_tilde, x_msi);
+ class_addmethod(m2f_tilde_class, (t_method)m2f_dsp, gensym("dsp"), 0);
+ m2f_maketable();
+ class_sethelpsymbol(m2f_tilde_class, gensym("iemhelp/help-m2f~"));
+}