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-rw-r--r--modules/ear.c134
1 files changed, 134 insertions, 0 deletions
diff --git a/modules/ear.c b/modules/ear.c
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+++ b/modules/ear.c
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+/*
+ * ear.c - exponential attack release envelope
+ * Copyright (c) 2000-2003 by Tom Schouten
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "extlib_util.h"
+
+typedef struct earctl
+{
+ t_float c_attack;
+ t_float c_release;
+ t_float c_state;
+ t_float c_target;
+} t_earctl;
+
+typedef struct ear
+{
+ t_object x_obj;
+ t_float x_sr;
+ t_earctl x_ctl;
+} t_ear;
+
+void ear_attack(t_ear *x, t_floatarg f)
+{
+ x->x_ctl.c_attack = milliseconds_2_one_minus_realpole(f);
+}
+
+void ear_release(t_ear *x, t_floatarg f)
+{
+ x->x_ctl.c_release = milliseconds_2_one_minus_realpole(f);
+}
+
+void ear_start(t_ear *x)
+{
+ x->x_ctl.c_target = 1;
+
+}
+
+void ear_stop(t_ear *x)
+{
+ x->x_ctl.c_target = 0;
+
+}
+
+static t_int *ear_perform(t_int *w)
+{
+ t_float *out = (float *)(w[3]);
+ t_earctl *ctl = (t_earctl *)(w[1]);
+ t_float attack = ctl->c_attack;
+ t_float release = ctl->c_release;
+ t_float state = ctl->c_state;
+ t_float target = ctl->c_target;
+ t_int n = (t_int)(w[2]);
+
+ t_int i;
+
+ if (target) /* attack phase */
+ for (i = 0; i < n; i++)
+ {
+ *out++ = state;
+ state += attack*(1 - state);
+ }
+ else /* release phase */
+ for (i = 0; i < n; i++)
+ {
+ *out++ = state;
+ state -= release*state;
+ }
+
+ ctl->c_state = state;
+ return (w+4);
+}
+
+static void ear_dsp(t_ear *x, t_signal **sp)
+{
+ x->x_sr = sp[0]->s_sr;
+ dsp_add(ear_perform, 3, &x->x_ctl, sp[0]->s_n, sp[0]->s_vec);
+
+}
+void ear_free(void)
+{
+
+}
+
+
+t_class *ear_class; /* attack - release */
+
+void *ear_new(t_floatarg attack, t_floatarg release)
+{
+ t_ear *x = (t_ear *)pd_new(ear_class);
+ inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("attack"));
+ inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("release"));
+ outlet_new(&x->x_obj, gensym("signal"));
+
+ ear_attack(x,attack);
+ ear_release(x,release);
+ x->x_ctl.c_state = 0;
+ x->x_ctl.c_target = 0;
+
+ return (void *)x;
+}
+
+
+void ear_tilde_setup(void)
+{
+ //post("ear~ v0.1");
+ ear_class = class_new(gensym("ear~"), (t_newmethod)ear_new,
+ (t_method)ear_free, sizeof(t_ear), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
+ class_addmethod(ear_class, (t_method)ear_start, gensym("start"), 0);
+ class_addmethod(ear_class, (t_method)ear_start, gensym("bang"), 0);
+ class_addmethod(ear_class, (t_method)ear_stop, gensym("stop"), 0);
+ class_addmethod(ear_class, (t_method)ear_dsp, gensym("dsp"), 0);
+ class_addmethod(ear_class,
+ (t_method)ear_attack, gensym("attack"), A_FLOAT, 0);
+ class_addmethod(ear_class,
+ (t_method)ear_release, gensym("release"), A_FLOAT, 0);
+
+
+}
+