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+/*
+ * ead.c - exponential attack decay 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 <m_pd.h>
+#include <math.h>
+#include "extlib_util.h"
+
+/* pointer to */
+t_class *ead_class;
+
+
+/* state data fpr attack/decay dsp plugin */
+typedef struct eadctl
+{
+ t_float c_attack;
+ t_float c_decay;
+ t_float c_state;
+ t_int c_target;
+} t_eadctl;
+
+
+/* object data structure */
+typedef struct ead
+{
+ t_object x_obj;
+ t_eadctl x_ctl;
+} t_ead;
+
+
+
+static void ead_attack(t_ead *x, t_floatarg f)
+{
+ x->x_ctl.c_attack = milliseconds_2_one_minus_realpole(f);
+}
+
+static void ead_decay(t_ead *x, t_floatarg f)
+{
+ x->x_ctl.c_decay = milliseconds_2_one_minus_realpole(f);
+}
+
+static void ead_start(t_ead *x)
+{
+ /* reset state if necessary to prevent skipping */
+
+ // always reset, seems to be safest
+ //if (x->x_ctl.c_target == 1)
+
+ x->x_ctl.c_state = 0.0f;
+ x->x_ctl.c_target = 1;
+}
+
+
+/* dsp callback function, not a method */
+static t_int *ead_perform(t_int *w)
+{
+
+ /* interprete arguments */
+ t_float *out = (float *)(w[3]);
+ t_eadctl *ctl = (t_eadctl *)(w[1]);
+ t_float attack = ctl->c_attack;
+ t_float decay = ctl->c_decay;
+ t_float state = ctl->c_state;
+ t_int n = (t_int)(w[2]);
+
+ t_int i;
+
+
+ /* A/D code */
+
+ for (i = 0; i < n; i++){
+ switch(ctl->c_target){
+ case 1:
+ /* attack phase */
+ *out++ = state;
+ state += attack*(1 - state);
+ ctl->c_target = (state <= ENVELOPE_MAX);
+ break;
+ default:
+ /* decay phase */
+ *out++ = state;
+ state -= decay*state;
+ break;
+ }
+
+ }
+
+ /* save state */
+ ctl->c_state = IS_DENORMAL(state) ? 0 : state;
+
+ return (w+4);
+}
+
+
+static void ead_dsp(t_ead *x, t_signal **sp)
+{
+ dsp_add(ead_perform, 3, &x->x_ctl, sp[0]->s_n, sp[0]->s_vec);
+}
+
+/* destructor */
+static void ead_free(void)
+{
+
+}
+
+
+
+/* constructor */
+static void *ead_new(t_floatarg attack, t_floatarg decay, t_floatarg sustain, t_floatarg release)
+{
+ /* create instance */
+ t_ead *x = (t_ead *)pd_new(ead_class);
+ /* create new inlets, convert incoming message float to attack/decay */
+ 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("decay"));
+ /* create a dsp outlet */
+ outlet_new(&x->x_obj, gensym("signal"));
+
+ /* initialize */
+ x->x_ctl.c_state = 0;
+ x->x_ctl.c_target = 0;
+ ead_attack(x, attack);
+ ead_decay(x, decay);
+
+ /* return instance */
+ return (void *)x;
+}
+
+void ead_tilde_setup(void)
+{
+ //post("ead~ v0.1");
+
+ ead_class = class_new(gensym("ead~"), (t_newmethod)ead_new,
+ (t_method)ead_free, sizeof(t_ead), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
+
+
+ class_addmethod(ead_class, (t_method)ead_start, gensym("start"), 0);
+ class_addmethod(ead_class, (t_method)ead_start, gensym("bang"), 0);
+ class_addmethod(ead_class, (t_method)ead_dsp, gensym("dsp"), 0);
+ class_addmethod(ead_class, (t_method)ead_attack, gensym("attack"), A_FLOAT, 0);
+ class_addmethod(ead_class, (t_method)ead_decay, gensym("decay"), A_FLOAT, 0);
+}
+