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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 <gmodule.h>
#include "global.h"
#include "generator.h"
#include "comp.h"
#include "control.h"
#include "gencomp.h"
#define GENERATOR_CLASS_NAME "resample"
#define GENERATOR_CLASS_PATH "Timebase/Resample"
#define SIG_INPUT 0
#define SIG_OUTPUT 0
#define EVT_FACTOR 0
#define EVT_NOTE 1
typedef struct Data {
gdouble factor;
} Data;
#define FREQ_C0 16.351598
#define FREQ_A4 440
#define NOTE_C4 48
#define NOTE_A4 57
#define NOTE_TO_FACTOR(n, centre) (pow(2, ((n) - (centre)) / 12.0))
PRIVATE int init_instance(Generator *g) {
Data *data = safe_malloc(sizeof(Data));
g->data = data;
data->factor = 1;
return 1;
}
PRIVATE void destroy_instance(Generator *g) {
free(g->data);
}
PRIVATE void unpickle_instance(Generator *g, ObjectStoreItem *item, ObjectStore *db) {
Data *data = safe_malloc(sizeof(Data));
g->data = data;
data->factor = objectstore_item_get_double(item, "resample_factor", 1);
}
PRIVATE void pickle_instance(Generator *g, ObjectStoreItem *item, ObjectStore *db) {
Data *data = g->data;
objectstore_item_set_double(item, "resample_factor", data->factor);
}
PRIVATE SAMPLETIME output_range(Generator *g, OutputSignalDescriptor *sig) {
Data *data = g->data;
if (data->factor == 0)
return 0; /* GIGO */
return gen_get_randomaccess_input_range(g, SIG_INPUT, 0) / data->factor;
}
PRIVATE gboolean output_generator(Generator *g, OutputSignalDescriptor *sig,
SAMPLETIME offset, SAMPLE *buf, int buflen) {
Data *data = g->data;
SAMPLE tmpbuf[MAXIMUM_REALTIME_STEP*5];
int i;
gdouble o;
if (!gen_read_randomaccess_input(g, SIG_INPUT, 0,
offset*data->factor, tmpbuf, buflen*data->factor + 1))
return FALSE;
for (i = 0, o = 0; i < buflen; i++, o += data->factor) {
int oi = floor(o);
gdouble fract = o - oi;
buf[i] = ( tmpbuf[oi]*(1-fract) + tmpbuf[oi+1]*fract ) / 2;
}
return TRUE;
}
PRIVATE void evt_factor_handler(Generator *g, AEvent *event) {
((Data *) g->data)->factor = MAX(MIN(event->d.number, 4), 0);
}
PRIVATE void evt_note_handler(Generator *g, AEvent *event) {
((Data *) g->data)->factor = MAX(MIN(NOTE_TO_FACTOR(event->d.number, NOTE_C4), 4), 0);
}
PRIVATE InputSignalDescriptor input_sigs[] = {
{ "Input", SIG_FLAG_RANDOMACCESS },
{ NULL, }
};
PRIVATE OutputSignalDescriptor output_sigs[] = {
{ "Output", SIG_FLAG_RANDOMACCESS, { NULL, { output_range, output_generator } } },
{ NULL, }
};
PRIVATE ControlDescriptor controls[] = {
/* { kind, name, min,max,step,page, size,editable, is_dst,queue_number,
init,destroy,refresh,refresh_data }, */
{ CONTROL_KIND_KNOB, "factor", 0.5,4,0.01,0.01, 0,TRUE, TRUE,EVT_FACTOR,
NULL,NULL, control_double_updater, (gpointer) offsetof(Data, factor) },
{ CONTROL_KIND_KNOB, "note", 0,127,1,1, 0,TRUE, TRUE,EVT_NOTE,
NULL,NULL, NULL },
{ CONTROL_KIND_NONE, }
};
PRIVATE void setup_class(void) {
GeneratorClass *k = gen_new_generatorclass(GENERATOR_CLASS_NAME, FALSE, 2, 0,
input_sigs, output_sigs, controls,
init_instance, destroy_instance,
unpickle_instance, pickle_instance);
gen_configure_event_input(k, EVT_FACTOR, "Factor", evt_factor_handler);
gen_configure_event_input(k, EVT_NOTE, "Note", evt_note_handler);
gencomp_register_generatorclass(k, FALSE, GENERATOR_CLASS_PATH, NULL, NULL);
}
PUBLIC void init_plugin_resample(void) {
setup_class();
}
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