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/* gAlan - Graphical Audio Language
* Copyright (C) 1999 Tony Garnock-Jones
*
* 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 <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stddef.h>
#include <gdk/gdk.h>
#include <gtk/gtk.h>
#include "global.h"
#include "generator.h"
#include "comp.h"
#include "control.h"
#include "gencomp.h"
#define GENERATOR_CLASS_NAME "fbdelay"
#define GENERATOR_CLASS_PATH "Delay/Feedback safe Delay"
#define SIG_INPUT 0
#define SIG_FEEDBACK 0
#define SIG_OUTPUT 1
enum EVT_INPUTS {
EVT_DELAY = 0,
NUM_EVT_INPUTS
};
#define NUM_EVT_OUTPUTS 0
typedef struct Data {
SAMPLE *delay_buf;
gdouble delay_sec;
int delay;
int offset;
} Data;
#define DELAY_CONTROL_DELAY 0
PRIVATE ControlDescriptor delay_controls[] = {
{ CONTROL_KIND_KNOB, "delay", MAXIMUM_REALTIME_STEP/SAMPLE_RATE,1,0.0025,0.001, 0,TRUE, 1,EVT_DELAY,
NULL,NULL, control_double_updater, (gpointer) offsetof(Data, delay_sec) },
{ CONTROL_KIND_NONE, }
};
PRIVATE int init_instance(Generator *g) {
Data *data = safe_malloc(sizeof(Data));
g->data = data;
data->delay_buf = NULL;
data->delay = 0;
data->delay_sec = 0;
data->offset = 0;
return 1;
}
PRIVATE void destroy_instance(Generator *g) {
Data *data = g->data;
if (data->delay_buf != NULL)
free(data->delay_buf);
free(g->data);
}
PRIVATE void unpickle_instance(Generator *g, ObjectStoreItem *item, ObjectStore *db) {
Data *data = safe_malloc(sizeof(Data));
g->data = data;
data->delay = objectstore_item_get_integer(item, "delay_delay", 0);
data->delay_sec = data->delay / ((gdouble) SAMPLE_RATE);
data->delay_buf = calloc(data->delay, sizeof(SAMPLE));
data->offset = 0;
}
PRIVATE void pickle_instance(Generator *g, ObjectStoreItem *item, ObjectStore *db) {
Data *data = g->data;
objectstore_item_set_integer(item, "delay_delay", data->delay);
}
PRIVATE gboolean feedback_generator(Generator *g, SAMPLE *buf, int buflen) {
Data *data = g->data;
int i;
for (i = 0; i < buflen; i++) {
buf[i] = data->delay_buf[ (data->offset + i) % data->delay ];
}
return TRUE;
}
PRIVATE gboolean output_generator(Generator *g, SAMPLE *buf, int buflen) {
Data *data = g->data;
int i;
SAMPLE tmpbuf[MAXIMUM_REALTIME_STEP];
if (data->delay == 0)
return gen_read_realtime_input(g, SIG_INPUT, -1, buf, buflen);
else {
if (!gen_read_realtime_input(g, SIG_INPUT, -1, tmpbuf, buflen))
memset(tmpbuf, 0, buflen * sizeof(SAMPLE));
for (i = 0; i < buflen; i++) {
if (data->offset >= data->delay)
data->offset = 0;
buf[i] = data->delay_buf[data->offset];
data->delay_buf[data->offset] = tmpbuf[i];
data->offset++;
}
return TRUE;
}
}
PRIVATE void evt_delay_handler(Generator *g, AEvent *event) {
Data *data = g->data;
int olddelay = data->delay;
data->delay_sec = MAX(0, event->d.number);
data->delay = GEN_DOUBLE_TO_INT(data->delay_sec * SAMPLE_RATE);
gen_update_controls(g, DELAY_CONTROL_DELAY);
if (data->delay_buf != NULL)
data->delay_buf = realloc(data->delay_buf, data->delay * sizeof(SAMPLE));
else {
data->delay_buf = calloc(data->delay, sizeof(SAMPLE));
return;
}
if (data->delay > olddelay) {
if (olddelay > 0) {
int i;
SAMPLE val = data->delay_buf[olddelay - 1];
for (i = olddelay; i < data->delay; i++)
data->delay_buf[i] = val;
} else
memset(data->delay_buf, 0, data->delay * sizeof(SAMPLE));
}
}
PRIVATE InputSignalDescriptor input_sigs[] = {
{ "Input", SIG_FLAG_REALTIME },
{ NULL, }
};
PRIVATE OutputSignalDescriptor output_sigs[] = {
{ "Feedback Out", SIG_FLAG_REALTIME, { feedback_generator, } },
{ "Output", SIG_FLAG_REALTIME, { output_generator, } },
{ NULL, }
};
PRIVATE void setup_class(void) {
GeneratorClass *k = gen_new_generatorclass(GENERATOR_CLASS_NAME, FALSE,
NUM_EVT_INPUTS, NUM_EVT_OUTPUTS,
input_sigs, output_sigs, delay_controls,
init_instance, destroy_instance,
unpickle_instance, pickle_instance);
gen_configure_event_input(k, EVT_DELAY, "Delay", evt_delay_handler);
gencomp_register_generatorclass(k, FALSE, GENERATOR_CLASS_PATH, NULL, NULL);
}
PUBLIC void init_plugin_fbdelay(void) {
setup_class();
}
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