diff options
| author | Juha Vehviläinen <jusu@users.sourceforge.net> | 2002-10-06 05:14:51 +0000 |
|---|---|---|
| committer | IOhannes m zmölnig <zmoelnig@iem.at> | 2015-10-14 13:35:36 +0200 |
| commit | 3412cb85175a8378ff683367385b380f1a42fbfd (patch) | |
| tree | 3467c991a410260f097d9c81aa79c512604facc5 /aenv~/aenv~.c | |
| parent | 78ff76fee88298cfb6de419334ae0d4916ad91a8 (diff) | |
This commit was generated by cvs2svn to compensate for changes in r159,
which included commits to RCS files with non-trunk default branches.
svn path=/trunk/externals/aenv~/; revision=160
Diffstat (limited to 'aenv~/aenv~.c')
| -rw-r--r-- | aenv~/aenv~.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/aenv~/aenv~.c b/aenv~/aenv~.c new file mode 100644 index 0000000..691e305 --- /dev/null +++ b/aenv~/aenv~.c @@ -0,0 +1,166 @@ +/* Copyright 2002 Benjamin R. Saylor
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "m_pd.h"
+
+#ifdef NT
+#pragma warning( disable : 4244 )
+#pragma warning( disable : 4305 )
+#endif
+
+enum { ATTACK, DECAY, RELEASE, LINEAR, LOGARITHMIC };
+#define THRESHOLD 0.99
+#define SCALE 4600.0
+#define CLIP(x) ((x < 0.1) ? 0.1 : x)
+#define IS_DENORMAL(f) (((*(unsigned int *)&(f))&0x7f800000) == 0)
+
+static t_class *aenv_class;
+
+typedef struct _aenv {
+ t_object x_obj;
+ t_float srate;
+ t_float a;
+ t_float d;
+ t_float s;
+ t_float r;
+ t_float lastval;
+ int stage;
+ int attacktype;
+} t_aenv;
+
+static t_int *aenv_perform(t_int *w)
+{
+ t_aenv *x = (t_aenv *)(w[1]);
+ t_float *out = (t_float *)(w[2]);
+ int n = (int)(w[3]);
+
+ t_float lastval = x->lastval;
+ t_float a, d, s, r;
+
+ switch (x->stage) {
+ case ATTACK:
+ if (x->attacktype == LINEAR) {
+ a = 1000 / (x->a * x->srate);
+ while (n--) {
+ *out = lastval + a;
+ lastval = *(out++);
+ if (lastval > THRESHOLD) {
+ x->stage = DECAY;
+ break;
+ }
+ }
+ } else {
+ a = SCALE / (CLIP(x->a) * x->srate);
+ while (n--) {
+ *out = lastval + a * (1 - lastval);
+ lastval = *(out++);
+ if (lastval > THRESHOLD) {
+ x->stage = DECAY;
+ break;
+ }
+ }
+ }
+ case DECAY:
+ d = SCALE / (CLIP(x->d) * x->srate);
+ s = x->s;
+ while (n-- > 0) {
+ *out = lastval - d * (lastval - s);
+ if (IS_DENORMAL(*out)) *out = 0.0;
+ lastval = *(out++);
+ }
+ break;
+ case RELEASE:
+ r = SCALE / (CLIP(x->r) * x->srate);
+ while (n--) {
+ *out = lastval - r * lastval;
+ if (IS_DENORMAL(*out)) *out = 0.0;
+ lastval = *(out++);
+ }
+ }
+
+ x->lastval = lastval;
+
+ return (w+4);
+}
+
+static void aenv_dsp(t_aenv *x, t_signal **sp)
+{
+ dsp_add(aenv_perform, 3, x, sp[0]->s_vec, sp[0]->s_n);
+}
+
+static void aenv_float(t_aenv *x, t_float f)
+{
+ if (f == 0)
+ x->stage = RELEASE;
+ else
+ x->stage = ATTACK;
+}
+
+static void *aenv_new(t_symbol *s, int argc, t_atom *argv)
+{
+ t_aenv *x = (t_aenv *)pd_new(aenv_class);
+ floatinlet_new(&x->x_obj, &x->a);
+ floatinlet_new(&x->x_obj, &x->d);
+ floatinlet_new(&x->x_obj, &x->s);
+ floatinlet_new(&x->x_obj, &x->r);
+ outlet_new(&x->x_obj, gensym("signal"));
+
+ x->srate = sys_getsr();
+ x->a = 500;
+ x->d = 500;
+ x->s = 0.5;
+ x->r = 500;
+ x->lastval = 0;
+ x->stage = RELEASE;
+ x->attacktype = LOGARITHMIC;
+
+ if (argc == 4) {
+ x->a = atom_getfloat(argv);
+ x->d = atom_getfloat(argv+1);
+ x->s = atom_getfloat(argv+2);
+ x->r = atom_getfloat(argv+3);
+ }
+
+ return (x);
+}
+
+static void aenv_lina(t_aenv *x)
+{
+ x->attacktype = LINEAR;
+}
+
+static void aenv_loga(t_aenv *x)
+{
+ x->attacktype = LOGARITHMIC;
+}
+
+static void aenv_zero(t_aenv *x)
+{
+ x->stage = RELEASE;
+ x->lastval = 0.0;
+}
+
+void aenv_tilde_setup(void)
+{
+ aenv_class = class_new(gensym("aenv~"), (t_newmethod)aenv_new, 0, sizeof(t_aenv), 0, A_GIMME, 0);
+ class_sethelpsymbol(aenv_class, gensym("help-aenv~.pd"));
+ class_addmethod(aenv_class, (t_method)aenv_dsp, gensym("dsp"), 0);
+ class_addfloat(aenv_class, (t_method)aenv_float);
+ class_addmethod(aenv_class, (t_method)aenv_lina, gensym("lina"), 0);
+ class_addmethod(aenv_class, (t_method)aenv_loga, gensym("loga"), 0);
+ class_addmethod(aenv_class, (t_method)aenv_zero, gensym("zero"), 0);
+}
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