277 lines
7.4 KiB
C
277 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) 2012-2015 - Michael Lelli
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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 <alsa/asoundlib.h>
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#include <rthreads/rthreads.h>
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#include <queues/fifo_queue.h>
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#include <string/stdstring.h>
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#include <asm-generic/errno.h>
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#include "../audio_driver.h"
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#include "../common/alsa.h" /* For some common functions/types */
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#include "../common/alsathread.h"
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#include "../../verbosity.h"
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typedef struct alsa_thread
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{
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alsa_thread_info_t info;
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bool nonblock;
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bool is_paused;
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} alsa_thread_t;
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static void alsa_worker_thread(void *data)
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{
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alsa_thread_t *alsa = (alsa_thread_t*)data;
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uint8_t *buf = (uint8_t *)calloc(1, alsa->info.stream_info.period_size);
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uintptr_t thread_id = sthread_get_current_thread_id();
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if (!buf)
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{
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RARCH_ERR("[ALSA] [playback thread %u]: Failed to allocate audio buffer\n", thread_id);
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goto end;
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}
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RARCH_DBG("[ALSA] [playback thread %p]: Beginning playback worker thread\n", thread_id);
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while (!alsa->info.thread_dead)
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{
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size_t avail;
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size_t fifo_size;
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snd_pcm_sframes_t frames;
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slock_lock(alsa->info.fifo_lock);
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avail = FIFO_READ_AVAIL(alsa->info.buffer);
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fifo_size = MIN(alsa->info.stream_info.period_size, avail);
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fifo_read(alsa->info.buffer, buf, fifo_size);
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scond_signal(alsa->info.cond);
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slock_unlock(alsa->info.fifo_lock);
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/* If underrun, fill rest with silence. */
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memset(buf + fifo_size, 0, alsa->info.stream_info.period_size - fifo_size);
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frames = snd_pcm_writei(alsa->info.pcm, buf, alsa->info.stream_info.period_frames);
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if (frames == -EPIPE || frames == -EINTR ||
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frames == -ESTRPIPE)
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{
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if (snd_pcm_recover(alsa->info.pcm, frames, false) < 0)
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{
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RARCH_ERR("[ALSA] [playback thread %u]: Failed to recover from error: %s\n",
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thread_id,
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snd_strerror(frames));
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break;
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}
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continue;
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}
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else if (frames < 0)
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{
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RARCH_ERR("[ALSA] [playback thread %u]: Error writing audio to device: %s\n",
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thread_id,
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snd_strerror(frames));
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break;
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}
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}
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end:
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slock_lock(alsa->info.cond_lock);
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alsa->info.thread_dead = true;
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scond_signal(alsa->info.cond);
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slock_unlock(alsa->info.cond_lock);
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free(buf);
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RARCH_DBG("[ALSA] [playback thread %p]: Ending playback worker thread\n", thread_id);
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}
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static bool alsa_thread_use_float(void *data)
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{
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alsa_thread_t *alsa = (alsa_thread_t*)data;
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return alsa->info.stream_info.has_float;
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}
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static void alsa_thread_free(void *data)
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{
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alsa_thread_t *alsa = (alsa_thread_t*)data;
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if (alsa)
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{
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alsa_thread_free_info_members(&alsa->info);
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free(alsa);
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}
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}
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static void *alsa_thread_init(const char *device,
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unsigned rate, unsigned latency,
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unsigned block_frames,
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unsigned *new_rate)
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{
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alsa_thread_t *alsa = (alsa_thread_t*)calloc(1, sizeof(alsa_thread_t));
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if (!alsa)
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{
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RARCH_ERR("[ALSA] Failed to allocate driver context\n");
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return NULL;
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}
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RARCH_LOG("[ALSA] Using ALSA version %s\n", snd_asoundlib_version());
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if (alsa_init_pcm(&alsa->info.pcm, device, SND_PCM_STREAM_PLAYBACK, rate, latency, 2, &alsa->info.stream_info, new_rate, 0) < 0)
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{
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goto error;
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}
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alsa->info.fifo_lock = slock_new();
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alsa->info.cond_lock = slock_new();
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alsa->info.cond = scond_new();
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alsa->info.buffer = fifo_new(alsa->info.stream_info.buffer_size);
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if (!alsa->info.fifo_lock || !alsa->info.cond_lock || !alsa->info.cond || !alsa->info.buffer)
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goto error;
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alsa->info.worker_thread = sthread_create(alsa_worker_thread, alsa);
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if (!alsa->info.worker_thread)
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{
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RARCH_ERR("[ALSA]: Failed to initialize worker thread\n");
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goto error;
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}
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return alsa;
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error:
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RARCH_ERR("[ALSA]: Failed to initialize...\n");
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alsa_thread_free(alsa);
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return NULL;
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}
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static ssize_t alsa_thread_write(void *data, const void *buf, size_t size)
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{
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alsa_thread_t *alsa = (alsa_thread_t*)data;
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if (alsa->info.thread_dead)
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return -1;
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if (alsa->nonblock)
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{
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size_t avail;
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size_t write_amt;
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slock_lock(alsa->info.fifo_lock);
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avail = FIFO_WRITE_AVAIL(alsa->info.buffer);
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write_amt = MIN(avail, size);
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fifo_write(alsa->info.buffer, buf, write_amt);
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slock_unlock(alsa->info.fifo_lock);
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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 && !alsa->info.thread_dead)
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{
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size_t avail;
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slock_lock(alsa->info.fifo_lock);
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avail = FIFO_WRITE_AVAIL(alsa->info.buffer);
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if (avail == 0)
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{
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slock_unlock(alsa->info.fifo_lock);
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slock_lock(alsa->info.cond_lock);
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if (!alsa->info.thread_dead)
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scond_wait(alsa->info.cond, alsa->info.cond_lock);
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slock_unlock(alsa->info.cond_lock);
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}
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else
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{
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size_t write_amt = MIN(size - written, avail);
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fifo_write(alsa->info.buffer,
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(const char*)buf + written, write_amt);
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slock_unlock(alsa->info.fifo_lock);
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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 alsa_thread_alive(void *data)
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{
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alsa_thread_t *alsa = (alsa_thread_t*)data;
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if (!alsa)
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return false;
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return !alsa->is_paused;
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}
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static bool alsa_thread_stop(void *data)
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{
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alsa_thread_t *alsa = (alsa_thread_t*)data;
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if (alsa)
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alsa->is_paused = true;
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return true;
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}
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static void alsa_thread_set_nonblock_state(void *data, bool state)
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{
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alsa_thread_t *alsa = (alsa_thread_t*)data;
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alsa->nonblock = state;
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}
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static bool alsa_thread_start(void *data, bool is_shutdown)
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{
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alsa_thread_t *alsa = (alsa_thread_t*)data;
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if (alsa)
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alsa->is_paused = false;
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return true;
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}
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static size_t alsa_thread_write_avail(void *data)
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{
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alsa_thread_t *alsa = (alsa_thread_t*)data;
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size_t val;
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if (alsa->info.thread_dead)
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return 0;
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slock_lock(alsa->info.fifo_lock);
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val = FIFO_WRITE_AVAIL(alsa->info.buffer);
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slock_unlock(alsa->info.fifo_lock);
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return val;
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}
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static size_t alsa_thread_buffer_size(void *data)
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{
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alsa_thread_t *alsa = (alsa_thread_t*)data;
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return alsa->info.stream_info.buffer_size;
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}
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audio_driver_t audio_alsathread = {
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alsa_thread_init,
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alsa_thread_write,
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alsa_thread_stop,
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alsa_thread_start,
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alsa_thread_alive,
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alsa_thread_set_nonblock_state,
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alsa_thread_free,
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alsa_thread_use_float,
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"alsathread",
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alsa_device_list_new, /* Reusing these functions from alsa.c */
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alsa_device_list_free, /* because they don't use the driver context */
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alsa_thread_write_avail,
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alsa_thread_buffer_size
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};
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