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|
/* _______ ____ __ ___ ___
* \ _ \ \ / \ / \ \ / / ' ' '
* | | \ \ | | || | \/ | . .
* | | | | | | || ||\ /| |
* | | | | | | || || \/ | | ' ' '
* | | | | | | || || | | . .
* | |_/ / \ \__// || | |
* /_______/ynamic \____/niversal /__\ /____\usic /| . . ibliotheque
* / \
* / . \
* combine.c - The combining (COMB) signal type. / / \ \
* | < / \_
* By entheh. | \/ /\ /
* \_ / > /
* This takes multiple monaural signals and | \ / /
* combines them into a single multichannel | ' /
* signal. It assumes the correct number of \__/
* channels is passed. An ASSERT() is in place
* to check the number of channels when you
* compile with -DDEBUGMODE. As an exception, if one channel is passed the
* signals are all mixed together.
*/
#include <stdlib.h>
#include "dumb.h"
#define SIGTYPE_COMBINING DUMB_ID('C','O','M','B')
typedef struct COMBINING_SIGNAL
{
int n_signals;
int sig[ZERO_SIZE];
}
COMBINING_SIGNAL;
typedef struct COMBINING_SAMPINFO
{
int n_signals;
int downmix;
DUH_SIGNAL_SAMPINFO *csampinfo[ZERO_SIZE];
}
COMBINING_SAMPINFO;
static void *combining_load_signal(DUH *duh, DUMBFILE *file)
{
COMBINING_SIGNAL *signal;
int n_signals;
(void)duh;
n_signals = dumbfile_getc(file);
/* No point in combining only one signal! */
if (dumbfile_error(file) || n_signals <= 1)
return NULL;
signal = malloc(sizeof(*signal) + n_signals * sizeof(*signal->sig));
if (!signal)
return NULL;
signal->n_signals = n_signals;
{
int n;
for (n = 0; n < signal->n_signals; n++) {
signal->sig[n] = dumbfile_igetl(file);
if (dumbfile_error(file)) {
free(signal);
return NULL;
}
}
}
return signal;
}
static void *combining_start_samples(DUH *duh, void *signal, int n_channels, long pos)
{
#define signal ((COMBINING_SIGNAL *)signal)
COMBINING_SAMPINFO *sampinfo;
sampinfo = malloc(sizeof(*sampinfo) + signal->n_signals * sizeof(*sampinfo->csampinfo));
if (!sampinfo)
return NULL;
sampinfo->n_signals = signal->n_signals;
if (n_channels == 1)
sampinfo->downmix = 1;
else if (n_channels == signal->n_signals)
sampinfo->downmix = 0;
else {
TRACE("Combining signal discrepancy: %d signals, %d channels.\n", signal->n_signals, n_channels);
free(sampinfo);
return NULL;
}
{
int worthwhile = 0;
{
int n;
for (n = 0; n < signal->n_signals; n++) {
sampinfo->csampinfo[n] = duh_signal_start_samples(duh, signal->sig[n], 1, pos);
if (sampinfo->csampinfo[n])
worthwhile = 1;
}
}
if (!worthwhile) {
free(sampinfo);
return NULL;
}
}
return sampinfo;
#undef signal
}
static long combining_render_samples(
void *sampinfo,
float volume, float delta,
long size, sample_t **samples
)
{
#define sampinfo ((COMBINING_SAMPINFO *)sampinfo)
long max_size;
int n;
if (sampinfo->downmix)
volume /= sampinfo->n_signals;
max_size = duh_signal_render_samples(sampinfo->csampinfo[0], volume, delta, size, samples);
if (sampinfo->downmix) {
long s;
long sz;
sample_t *sampbuf = malloc(size * sizeof(sample_t));
if (!sampbuf)
return 0;
for (n = 1; n < sampinfo->n_signals; n++) {
sz = duh_signal_render_samples(sampinfo->csampinfo[n], volume, delta, size, &sampbuf);
if (sz > max_size) {
for (s = max_size; s < sz; s++)
samples[0][s] = sampbuf[s];
sz = max_size;
max_size = s;
}
for (s = 0; s < sz; s++)
samples[0][s] += sampbuf[s];
}
free(sampbuf);
} else {
long *sz = malloc(size * sizeof(*sz));
long s;
if (!sz)
return 0;
sz[0] = max_size;
for (n = 1; n < sampinfo->n_signals; n++) {
sz[n] = duh_signal_render_samples(sampinfo->csampinfo[n], volume, delta, size, samples + n);
if (sz[n] > max_size)
max_size = sz[n];
}
for (n = 0; n < sampinfo->n_signals; n++)
for (s = sz[n]; s < max_size; s++)
samples[n][s] = 0;
free(sz);
}
return max_size;
#undef sampinfo
}
static void combining_end_samples(void *sampinfo)
{
#define sampinfo ((COMBINING_SAMPINFO *)sampinfo)
int n;
for (n = 0; n < sampinfo->n_signals; n++)
duh_signal_end_samples(sampinfo->csampinfo[n]);
free(sampinfo);
#undef sampinfo
}
static void combining_unload_signal(void *signal)
{
free(signal);
}
static DUH_SIGTYPE_DESC sigtype_combining = {
SIGTYPE_COMBINING,
&combining_load_signal,
&combining_start_samples,
NULL,
&combining_render_samples,
&combining_end_samples,
&combining_unload_signal
};
void dumb_register_sigtype_combining(void)
{
dumb_register_sigtype(&sigtype_combining);
}
|
