mirror of
https://github.com/libretro/RetroArch.git
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194 lines
4.3 KiB
C
194 lines
4.3 KiB
C
/* 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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*
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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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#include "buffer.h"
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#include <stdbool.h>
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#include "SDL.h"
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typedef struct rsd
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{
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rsound_t *rd;
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bool nonblock;
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volatile bool has_error;
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rsound_fifo_buffer_t *buffer;
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SDL_mutex *cond_lock;
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SDL_cond *cond;
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} rsd_t;
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static ssize_t audio_cb(void *data, size_t bytes, void *userdata)
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{
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rsd_t *rsd = userdata;
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size_t avail = rsnd_fifo_read_avail(rsd->buffer);
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size_t write_size = bytes > avail ? avail : bytes;
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rsnd_fifo_read(rsd->buffer, data, write_size);
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SDL_CondSignal(rsd->cond);
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return write_size;
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}
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static void err_cb(void *userdata)
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{
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rsd_t *rsd = userdata;
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rsd->has_error = true;
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SDL_CondSignal(rsd->cond);
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}
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static void* __rsd_init(const char* device, unsigned rate, unsigned 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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rsd->cond_lock = SDL_CreateMutex();
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rsd->cond = SDL_CreateCond();
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rsd->buffer = rsnd_fifo_new(1024 * 4);
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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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rsd_set_param(rd, RSD_LATENCY, &latency);
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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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rsd_set_callback(rd, audio_cb, err_cb, 256, rsd);
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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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rsd->rd = rd;
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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->has_error)
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return -1;
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if (rsd->nonblock)
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{
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rsd_callback_lock(rsd->rd);
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size_t avail = rsnd_fifo_write_avail(rsd->buffer);
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size_t write_amt = avail > size ? size : avail;
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rsnd_fifo_write(rsd->buffer, buf, write_amt);
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rsd_callback_unlock(rsd->rd);
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return write_amt;
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}
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else
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{
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size_t written = 0;
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while (written < size && !rsd->has_error)
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{
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rsd_callback_lock(rsd->rd);
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size_t avail = rsnd_fifo_write_avail(rsd->buffer);
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if (avail == 0)
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{
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rsd_callback_unlock(rsd->rd);
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if (!rsd->has_error)
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{
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SDL_mutexP(rsd->cond_lock);
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SDL_CondWait(rsd->cond, rsd->cond_lock);
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SDL_mutexV(rsd->cond_lock);
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}
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}
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else
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{
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size_t write_amt = size - written > avail ? avail : size - written;
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rsnd_fifo_write(rsd->buffer, (const char*)buf + written, write_amt);
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rsd_callback_unlock(rsd->rd);
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written += write_amt;
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}
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}
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return written;
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}
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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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rsnd_fifo_free(rsd->buffer);
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SDL_DestroyMutex(rsd->cond_lock);
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SDL_DestroyCond(rsd->cond);
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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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.ident = "rsound"
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};
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