mirror of
https://github.com/libretro/RetroArch.git
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146 lines
3.0 KiB
C
146 lines
3.0 KiB
C
/* SSNES - A Super Ninteno Entertainment System (SNES) Emulator frontend for libsnes.
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* Copyright (C) 2010 - Hans-Kristian Arntzen
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*
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* Some code herein may be based on code found in BSNES.
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*
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* SSNES is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* SSNES is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with SSNES.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "driver.h"
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#include <stdlib.h>
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#include <rsound.h>
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typedef struct rsd
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{
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rsound_t *rd;
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int latency;
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int rate;
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int nonblock;
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} rsd_t;
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static void* __rsd_init(const char* device, int rate, int latency)
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{
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rsd_t *rsd = calloc(1, sizeof(rsd_t));
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if ( rsd == NULL )
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return NULL;
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rsound_t *rd;
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if ( rsd_init(&rd) < 0 )
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{
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free(rsd);
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return NULL;
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}
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int channels = 2;
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int format = RSD_S16_NE;
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rsd_set_param(rd, RSD_CHANNELS, &channels);
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rsd_set_param(rd, RSD_SAMPLERATE, &rate);
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if ( device != NULL )
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rsd_set_param(rd, RSD_HOST, (void*)device);
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rsd_set_param(rd, RSD_FORMAT, &format);
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if ( rsd_start(rd) < 0 )
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{
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free(rsd);
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rsd_free(rd);
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return NULL;
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}
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int min_latency = (rsd_delay_ms(rd) > latency) ? (rsd_delay_ms(rd) * 3 / 2) : latency;
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rsd_set_param(rd, RSD_LATENCY, &min_latency);
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rsd->rd = rd;
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rsd->latency = min_latency;
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rsd->rate = rate;
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return rsd;
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}
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static ssize_t __rsd_write(void* data, const void* buf, size_t size)
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{
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rsd_t *rsd = data;
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if ( rsd_delay_ms(rsd->rd) > rsd->latency && rsd->nonblock )
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return 0;
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if ( size == 0 )
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return 0;
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rsd_delay_wait(rsd->rd);
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if ( rsd_write(rsd->rd, buf, size) == 0 )
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return -1;
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if ( rsd_delay_ms(rsd->rd) < rsd->latency/2 )
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{
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int ms = rsd->latency/2;
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size_t size = (ms * rsd->rate * 4) / 1000;
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void *temp = calloc(1, size);
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rsd_write(rsd->rd, temp, size);
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free(temp);
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}
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return size;
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}
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static bool __rsd_stop(void *data)
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{
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rsd_t *rsd = data;
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rsd_stop(rsd->rd);
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return true;
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}
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static void __rsd_set_nonblock_state(void *data, bool state)
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{
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rsd_t *rsd = data;
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rsd->nonblock = state;
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}
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static bool __rsd_start(void *data)
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{
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rsd_t *rsd = data;
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if ( rsd_start(rsd->rd) < 0)
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return false;
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return true;
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}
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static void __rsd_free(void *data)
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{
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rsd_t *rsd = data;
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rsd_stop(rsd->rd);
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rsd_free(rsd->rd);
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free(rsd);
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}
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const audio_driver_t audio_rsound = {
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.init = __rsd_init,
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.write = __rsd_write,
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.stop = __rsd_stop,
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.start = __rsd_start,
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.set_nonblock_state = __rsd_set_nonblock_state,
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.free = __rsd_free
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};
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