RetroArch/audio/roar.c

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/* SSNES - A Super Nintendo Entertainment System (SNES) Emulator frontend for libsnes.
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* Copyright (C) 2010-2011 - Hans-Kristian Arntzen
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*
* 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 <roaraudio.h>
#include <errno.h>
#include <stdio.h>
#include <stdbool.h>
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#include "general.h"
typedef struct
{
roar_vs_t *vss;
bool nonblocking;
} roar_t;
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static void* __roar_init(const char* device, unsigned rate, unsigned latency)
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{
int err;
roar_t *roar = calloc(1, sizeof(roar_t));
if (roar == NULL)
return NULL;
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roar_vs_t *vss;
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if ((vss = roar_vs_new_simple(device, "SSNES", rate, 2, ROAR_CODEC_PCM_S, 16, ROAR_DIR_PLAY, &err)) == NULL)
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{
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SSNES_ERR("RoarAudio: \"%s\"\n", roar_vs_strerr(err));
free(roar);
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return NULL;
}
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roar_vs_role(vss, ROAR_ROLE_GAME, NULL);
roar->vss = vss;
return roar;
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}
static ssize_t __roar_write(void* data, const void* buf, size_t size)
{
roar_t *roar = data;
ssize_t rc;
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if (size == 0)
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return 0;
int err;
size_t written = 0;
while (written < size)
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{
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size_t write_amt = size - written;
if ((rc = roar_vs_write(roar->vss, (const char*)buf + written, write_amt, &err)) < write_amt)
{
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if (roar->nonblocking)
return rc;
else if (rc < 0)
return -1;
}
written += rc;
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}
return size;
}
static bool __roar_stop(void *data)
{
(void)data;
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return true;
}
static void __roar_set_nonblock_state(void *data, bool state)
{
roar_t *roar = data;
if (roar_vs_blocking(roar->vss, (state) ? ROAR_VS_FALSE : ROAR_VS_TRUE, NULL) < 0)
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fprintf(stderr, "SSNES [ERROR]: Can't set nonblocking. Will not be able to fast-forward.\n");
roar->nonblocking = state;
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}
static bool __roar_start(void *data)
{
(void)data;
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return true;
}
static void __roar_free(void *data)
{
roar_t *roar = data;
roar_vs_close(roar->vss, ROAR_VS_TRUE, NULL);
free(data);
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}
const audio_driver_t audio_roar = {
.init = __roar_init,
.write = __roar_write,
.stop = __roar_stop,
.start = __roar_start,
.set_nonblock_state = __roar_set_nonblock_state,
.free = __roar_free,
.ident = "roar"
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};