RetroArch/audio/rsound.c

147 lines
3.1 KiB
C

/* SSNES - A Super Ninteno Entertainment System (SNES) Emulator frontend for libsnes.
* Copyright (C) 2010 - Hans-Kristian Arntzen
*
* Some code herein may be based on code found in BSNES.
*
* SSNES 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 Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* SSNES 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 SSNES.
* If not, see <http://www.gnu.org/licenses/>.
*/
#include "driver.h"
#include <stdlib.h>
#include <rsound.h>
typedef struct rsd
{
rsound_t *rd;
int latency;
int rate;
int nonblock;
} rsd_t;
static void* __rsd_init(const char* device, int rate, int latency)
{
rsd_t *rsd = calloc(1, sizeof(rsd_t));
if ( rsd == NULL )
return NULL;
rsound_t *rd;
if ( rsd_init(&rd) < 0 )
{
free(rsd);
return NULL;
}
int channels = 2;
int format = RSD_S16_NE;
rsd_set_param(rd, RSD_CHANNELS, &channels);
rsd_set_param(rd, RSD_SAMPLERATE, &rate);
if ( device != NULL )
rsd_set_param(rd, RSD_HOST, (void*)device);
rsd_set_param(rd, RSD_FORMAT, &format);
if ( rsd_start(rd) < 0 )
{
free(rsd);
rsd_free(rd);
return NULL;
}
int min_latency = (rsd_delay_ms(rd) > latency) ? (rsd_delay_ms(rd) * 3 / 2) : latency;
rsd_set_param(rd, RSD_LATENCY, &min_latency);
rsd->rd = rd;
rsd->latency = min_latency;
rsd->rate = rate;
return rsd;
}
static ssize_t __rsd_write(void* data, const void* buf, size_t size)
{
rsd_t *rsd = data;
if ( (rsd_delay_ms(rsd->rd) > rsd->latency || rsd_get_avail(rsd->rd) < size) && rsd->nonblock )
return 0;
if ( size == 0 )
return 0;
rsd_delay_wait(rsd->rd);
if ( rsd_write(rsd->rd, buf, size) == 0 )
return -1;
if ( rsd_delay_ms(rsd->rd) < rsd->latency/2 )
{
int ms = rsd->latency/2;
size_t size = (ms * rsd->rate * 4) / 1000;
void *temp = calloc(1, size);
rsd_write(rsd->rd, temp, size);
free(temp);
}
return size;
}
static bool __rsd_stop(void *data)
{
rsd_t *rsd = data;
rsd_stop(rsd->rd);
return true;
}
static void __rsd_set_nonblock_state(void *data, bool state)
{
rsd_t *rsd = data;
rsd->nonblock = state;
}
static bool __rsd_start(void *data)
{
rsd_t *rsd = data;
if ( rsd_start(rsd->rd) < 0)
return false;
return true;
}
static void __rsd_free(void *data)
{
rsd_t *rsd = data;
rsd_stop(rsd->rd);
rsd_free(rsd->rd);
free(rsd);
}
const audio_driver_t audio_rsound = {
.init = __rsd_init,
.write = __rsd_write,
.stop = __rsd_stop,
.start = __rsd_start,
.set_nonblock_state = __rsd_set_nonblock_state,
.free = __rsd_free,
.ident = "rsound"
};