mirror of
https://github.com/libretro/RetroArch.git
synced 2024-11-27 18:20:27 +00:00
327 lines
7.4 KiB
C
327 lines
7.4 KiB
C
/* RetroArch - A frontend for libretro.
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* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
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* Copyright (C) 2011-2017 - Daniel De Matteis
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*
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* RetroArch 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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* RetroArch 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 RetroArch.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <queues/fifo_queue.h>
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#include <rthreads/rthreads.h>
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#include "audio_thread_wrapper.h"
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#include "../verbosity.h"
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typedef struct audio_thread
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{
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const audio_driver_t *driver;
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void *driver_data;
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sthread_t *thread;
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slock_t *lock;
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scond_t *cond;
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const char *device;
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unsigned *new_rate;
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bool alive;
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bool stopped;
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bool stopped_ack;
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bool is_paused;
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bool is_shutdown;
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bool use_float;
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int inited;
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/* Initialization options. */
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unsigned out_rate;
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unsigned latency;
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unsigned block_frames;
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} audio_thread_t;
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static void audio_thread_loop(void *data)
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{
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audio_thread_t *thr = (audio_thread_t*)data;
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if (!thr)
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return;
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thr->driver_data = thr->driver->init(
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thr->device, thr->out_rate, thr->latency,
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thr->block_frames, thr->new_rate);
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slock_lock(thr->lock);
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thr->inited = thr->driver_data ? 1 : -1;
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if (thr->inited > 0 && thr->driver->use_float)
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thr->use_float = thr->driver->use_float(thr->driver_data);
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scond_signal(thr->cond);
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slock_unlock(thr->lock);
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if (thr->inited < 0)
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return;
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/* Wait until we start to avoid calling
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* stop immediately after initialization. */
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slock_lock(thr->lock);
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while (thr->stopped)
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scond_wait(thr->cond, thr->lock);
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slock_unlock(thr->lock);
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for (;;)
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{
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slock_lock(thr->lock);
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if (!thr->alive)
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{
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scond_signal(thr->cond);
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thr->stopped_ack = true;
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slock_unlock(thr->lock);
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break;
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}
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if (thr->stopped)
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{
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thr->driver->stop(thr->driver_data);
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while (thr->stopped)
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{
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/* If we stop right after start,
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* we might not be able to properly ack.
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* Signal in the loop instead. */
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thr->stopped_ack = true;
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scond_signal(thr->cond);
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scond_wait(thr->cond, thr->lock);
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}
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thr->driver->start(thr->driver_data, thr->is_shutdown);
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}
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slock_unlock(thr->lock);
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audio_driver_callback();
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}
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thr->driver->free(thr->driver_data);
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}
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static void audio_thread_block(audio_thread_t *thr)
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{
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if (!thr)
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return;
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if (thr->stopped)
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return;
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slock_lock(thr->lock);
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thr->stopped_ack = false;
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thr->stopped = true;
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scond_signal(thr->cond);
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/* Wait until audio driver actually goes to sleep. */
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while (!thr->stopped_ack)
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scond_wait(thr->cond, thr->lock);
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slock_unlock(thr->lock);
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}
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static void audio_thread_unblock(audio_thread_t *thr)
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{
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if (!thr)
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return;
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slock_lock(thr->lock);
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thr->stopped = false;
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scond_signal(thr->cond);
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slock_unlock(thr->lock);
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}
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static void audio_thread_free(void *data)
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{
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audio_thread_t *thr = (audio_thread_t*)data;
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if (!thr)
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return;
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if (thr->thread)
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{
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slock_lock(thr->lock);
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thr->stopped = false;
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thr->alive = false;
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scond_signal(thr->cond);
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slock_unlock(thr->lock);
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sthread_join(thr->thread);
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}
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if (thr->lock)
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slock_free(thr->lock);
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if (thr->cond)
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scond_free(thr->cond);
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free(thr);
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}
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static bool audio_thread_alive(void *data)
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{
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bool alive = false;
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audio_thread_t *thr = (audio_thread_t*)data;
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if (!thr)
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return false;
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audio_thread_block(thr);
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alive = !thr->is_paused;
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audio_thread_unblock(thr);
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return alive;
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}
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static bool audio_thread_stop(void *data)
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{
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audio_thread_t *thr = (audio_thread_t*)data;
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if (!thr)
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return false;
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audio_thread_block(thr);
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thr->is_paused = true;
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audio_driver_disable_callback();
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return true;
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}
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static bool audio_thread_start(void *data, bool is_shutdown)
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{
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audio_thread_t *thr = (audio_thread_t*)data;
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if (!thr)
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return false;
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audio_driver_enable_callback();
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thr->is_paused = false;
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thr->is_shutdown = is_shutdown;
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audio_thread_unblock(thr);
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return true;
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}
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static void audio_thread_set_nonblock_state(void *data, bool state)
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{
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(void)data;
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(void)state;
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}
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static bool audio_thread_use_float(void *data)
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{
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audio_thread_t *thr = (audio_thread_t*)data;
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if (!thr)
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return false;
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return thr->use_float;
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}
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static ssize_t audio_thread_write(void *data, const void *buf, size_t size)
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{
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ssize_t ret;
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audio_thread_t *thr = (audio_thread_t*)data;
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if (!thr)
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return 0;
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ret = thr->driver->write(thr->driver_data, buf, size);
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if (ret < 0)
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{
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slock_lock(thr->lock);
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thr->alive = false;
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scond_signal(thr->cond);
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slock_unlock(thr->lock);
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}
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return ret;
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}
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static const audio_driver_t audio_thread = {
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NULL,
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audio_thread_write,
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audio_thread_stop,
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audio_thread_start,
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audio_thread_alive,
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audio_thread_set_nonblock_state,
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audio_thread_free,
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audio_thread_use_float,
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"audio-thread",
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NULL, /* No point in using rate control with threaded audio. */
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NULL,
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};
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/**
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* audio_init_thread:
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* @out_driver : output driver
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* @out_data : output audio data
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* @device : audio device (optional)
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* @out_rate : output audio rate
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* @latency : audio latency
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* @driver : audio driver
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*
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* Starts a audio driver in a new thread.
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* Access to audio driver will be mediated through this driver.
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* This driver interfaces with audio callback and is
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* only used in that case.
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*
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* Returns: true (1) if successful, otherwise false (0).
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**/
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bool audio_init_thread(const audio_driver_t **out_driver,
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void **out_data, const char *device, unsigned audio_out_rate,
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unsigned *new_rate, unsigned latency,
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unsigned block_frames, const audio_driver_t *drv)
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{
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audio_thread_t *thr = (audio_thread_t*)calloc(1, sizeof(*thr));
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if (!thr)
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return false;
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thr->driver = (const audio_driver_t*)drv;
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thr->device = device;
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thr->out_rate = audio_out_rate;
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thr->new_rate = new_rate;
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thr->latency = latency;
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thr->block_frames = block_frames;
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if (!(thr->cond = scond_new()))
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goto error;
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if (!(thr->lock = slock_new()))
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goto error;
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thr->alive = true;
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thr->stopped = true;
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if (!(thr->thread = sthread_create(audio_thread_loop, thr)))
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goto error;
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/* Wait until thread has initialized (or failed) the driver. */
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slock_lock(thr->lock);
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while (!thr->inited)
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scond_wait(thr->cond, thr->lock);
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slock_unlock(thr->lock);
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if (thr->inited < 0) /* Thread failed. */
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goto error;
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*out_driver = &audio_thread;
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*out_data = thr;
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return true;
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error:
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*out_driver = NULL;
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*out_data = NULL;
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audio_thread_free(thr);
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return false;
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}
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