2010-08-25 20:38:53 +00:00
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/* 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 <AL/al.h>
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#include <AL/alc.h>
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2010-08-25 20:42:09 +00:00
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#include <time.h>
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#include <string.h>
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2010-08-25 20:38:53 +00:00
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2010-11-13 17:50:34 +00:00
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#ifdef _WIN32
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#include <windows.h>
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#endif
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2010-08-25 20:38:53 +00:00
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#define BUFSIZE 128
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typedef struct al
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{
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ALuint source;
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ALuint *buffers;
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ALuint *res_buf;
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int res_ptr;
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ALenum format;
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int num_buffers;
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int rate;
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int queue;
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uint8_t tmpbuf[BUFSIZE];
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int tmpbuf_ptr;
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ALCdevice *handle;
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ALCcontext *ctx;
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bool nonblock;
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} al_t;
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static void* __al_init(const char* device, int rate, int latency)
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{
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(void)device;
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2010-08-25 20:42:09 +00:00
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al_t *al = calloc(1, sizeof(al_t));
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2010-08-25 20:38:53 +00:00
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if ( al == NULL )
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return NULL;
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al->handle = alcOpenDevice(NULL);
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if (al->handle == NULL)
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goto error;
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al->ctx = alcCreateContext(al->handle, NULL);
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if (al->ctx == NULL)
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goto error;
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alcMakeContextCurrent(al->ctx);
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al->rate = rate;
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al->num_buffers = (latency * rate * 2 * 2) / (1000 * BUFSIZE);
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al->buffers = calloc(al->num_buffers, sizeof(ALuint));
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al->res_buf = calloc(al->num_buffers, sizeof(ALuint));
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if (al->buffers == NULL || al->res_buf == NULL)
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goto error;
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2010-08-25 20:42:09 +00:00
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alGenSources(1, &al->source);
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2010-08-25 20:38:53 +00:00
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alGenBuffers(al->num_buffers, al->buffers);
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2010-08-25 20:53:52 +00:00
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memcpy(al->res_buf, al->buffers, al->num_buffers * sizeof(ALuint));
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al->res_ptr = al->num_buffers;
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2010-08-25 20:38:53 +00:00
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return al;
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error:
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if (al)
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{
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alcMakeContextCurrent(NULL);
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if (al->ctx)
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alcDestroyContext(al->ctx);
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if (al->handle)
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alcCloseDevice(al->handle);
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if (al->buffers)
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free(al->buffers);
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if (al->res_buf)
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free(al->res_buf);
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free(al);
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}
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return NULL;
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}
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static bool al_unqueue_buffers(al_t *al)
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{
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ALint val;
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alGetSourcei(al->source, AL_BUFFERS_PROCESSED, &val);
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if (val > 0)
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{
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alSourceUnqueueBuffers(al->source, val, &al->res_buf[al->res_ptr]);
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al->res_ptr += val;
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return true;
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}
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return false;
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}
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static bool al_get_buffer(al_t *al, ALuint *buffer)
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{
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if (al->res_ptr == 0)
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{
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#ifndef _WIN32
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struct timespec tv = {
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.tv_sec = 0,
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.tv_nsec = 1000000
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};
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#endif
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for(;;)
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{
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if (al_unqueue_buffers(al))
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break;
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2010-08-25 20:42:09 +00:00
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if (al->nonblock)
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2010-08-25 20:38:53 +00:00
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return false;
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#ifdef _WIN32
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Sleep(1);
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#else
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nanosleep(&tv, NULL);
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#endif
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}
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}
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*buffer = al->res_buf[--al->res_ptr];
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return true;
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}
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static size_t al_fill_internal_buf(al_t *al, const void* buf, size_t size)
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{
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size_t read_size = (BUFSIZE - al->tmpbuf_ptr > size) ? size : (BUFSIZE - al->tmpbuf_ptr);
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memcpy(al->tmpbuf + al->tmpbuf_ptr, buf, read_size);
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al->tmpbuf_ptr += read_size;
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return read_size;
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}
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static ssize_t __al_write(void* data, const void* buf, size_t size)
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{
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al_t *al = data;
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size_t written = 0;
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while (written < size)
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{
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size_t rc = al_fill_internal_buf(al, (const char*)buf + written, size - written);
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written += rc;
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if (al->tmpbuf_ptr != BUFSIZE)
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break;
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2010-08-25 20:53:52 +00:00
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ALuint buffer;
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if (!al_get_buffer(al, &buffer))
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return 0;
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alBufferData(buffer, AL_FORMAT_STEREO16, al->tmpbuf, BUFSIZE, al->rate);
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al->tmpbuf_ptr = 0;
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alSourceQueueBuffers(al->source, 1, &buffer);
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if (alGetError() != AL_NO_ERROR)
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return -1;
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ALint val;
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alGetSourcei(al->source, AL_SOURCE_STATE, &val);
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if (val != AL_PLAYING)
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alSourcePlay(al->source);
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if (alGetError() != AL_NO_ERROR)
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return -1;
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2010-08-25 20:38:53 +00:00
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}
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return size;
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}
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static bool __al_stop(void *data)
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{
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(void)data;
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return true;
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}
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static void __al_set_nonblock_state(void *data, bool state)
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{
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al_t *al = data;
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al->nonblock = state;
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}
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static bool __al_start(void *data)
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{
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(void)data;
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return true;
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}
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static void __al_free(void *data)
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{
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al_t *al= data;
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if (al)
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{
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alSourceStop(al->source);
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alDeleteSources(1, &al->source);
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if ( al->buffers )
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{
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alDeleteBuffers(al->num_buffers, al->buffers);
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free(al->buffers);
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free(al->res_buf);
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}
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}
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2010-11-13 17:50:34 +00:00
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alcMakeContextCurrent(NULL);
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alcDestroyContext(al->ctx);
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alcCloseDevice(al->handle);
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2010-08-25 20:38:53 +00:00
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free(al);
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}
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const audio_driver_t audio_openal = {
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.init = __al_init,
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.write = __al_write,
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.stop = __al_stop,
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.start = __al_start,
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.set_nonblock_state = __al_set_nonblock_state,
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2010-12-29 19:05:57 +00:00
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.free = __al_free,
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.ident = "openal"
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2010-08-25 20:38:53 +00:00
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};
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