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https://github.com/CTCaer/RetroArch.git
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57e48f7ee2
Avoid calling stop() right after init. Driver init/teardown now happens only in audio thread.
236 lines
5.5 KiB
C
236 lines
5.5 KiB
C
/* RetroArch - A frontend for libretro.
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* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
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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 "thread_wrapper.h"
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#include "../thread.h"
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#include "../general.h"
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#include "../performance.h"
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#include "../fifo_buffer.h"
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#include <stdlib.h>
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#include <string.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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bool alive;
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bool stopped;
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bool use_float;
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int inited;
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// Init options.
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const char *device;
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unsigned out_rate;
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unsigned latency;
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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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RARCH_LOG("[Audio Thread]: Initializing audio driver.\n");
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thr->driver_data = thr->driver->init(thr->device, thr->out_rate, thr->latency);
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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 stop immediately after init.
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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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RARCH_LOG("[Audio Thread]: Starting audio.\n");
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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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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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scond_wait(thr->cond, thr->lock);
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thr->driver->start(thr->driver_data);
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}
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slock_unlock(thr->lock);
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g_extern.system.audio_callback.callback();
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}
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RARCH_LOG("[Audio Thread]: Tearing down driver.\n");
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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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slock_lock(thr->lock);
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thr->stopped = true;
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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_unblock(audio_thread_t *thr)
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{
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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_stop(void *data)
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{
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audio_thread_t *thr = (audio_thread_t*)data;
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audio_thread_block(thr);
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g_extern.system.audio_callback.set_state(false);
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return true;
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}
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static bool audio_thread_start(void *data)
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{
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audio_thread_t *thr = (audio_thread_t*)data;
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g_extern.system.audio_callback.set_state(true);
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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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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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audio_thread_t *thr = (audio_thread_t*)data;
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ssize_t 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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return ret;
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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_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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bool rarch_threaded_audio_init(const audio_driver_t **out_driver, void **out_data,
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const char *device, unsigned out_rate, unsigned latency,
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const audio_driver_t *driver)
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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 = driver;
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thr->device = device;
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thr->out_rate = out_rate;
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thr->latency = latency;
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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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