mirror of
https://github.com/libretro/RetroArch.git
synced 2024-10-08 07:03:30 +00:00
347 lines
9.2 KiB
C
347 lines
9.2 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 "../../driver.h"
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#include <stdlib.h>
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#include <alsa/asoundlib.h>
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#include "../../general.h"
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#include <rthreads/rthreads.h>
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#include <queues/fifo_buffer.h>
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#define TRY_ALSA(x) if (x < 0) { \
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goto error; \
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}
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typedef struct alsa_thread
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{
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snd_pcm_t *pcm;
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bool nonblock;
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bool is_paused;
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bool has_float;
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volatile bool thread_dead;
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size_t buffer_size;
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size_t period_size;
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snd_pcm_uframes_t period_frames;
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fifo_buffer_t *buffer;
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sthread_t *worker_thread;
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slock_t *fifo_lock;
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scond_t *cond;
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slock_t *cond_lock;
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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->period_size);
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if (!buf)
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{
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RARCH_ERR("failed to allocate audio buffer");
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goto end;
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}
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while (!alsa->thread_dead)
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{
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slock_lock(alsa->fifo_lock);
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size_t avail = fifo_read_avail(alsa->buffer);
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size_t fifo_size = min(alsa->period_size, avail);
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fifo_read(alsa->buffer, buf, fifo_size);
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scond_signal(alsa->cond);
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slock_unlock(alsa->fifo_lock);
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/* If underrun, fill rest with silence. */
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memset(buf + fifo_size, 0, alsa->period_size - fifo_size);
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snd_pcm_sframes_t frames = snd_pcm_writei(
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alsa->pcm, buf, alsa->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->pcm, frames, 1) < 0)
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{
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RARCH_ERR("[ALSA]: (#2) Failed to recover from error (%s)\n",
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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]: Unknown error occured (%s).\n",
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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->cond_lock);
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alsa->thread_dead = true;
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scond_signal(alsa->cond);
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slock_unlock(alsa->cond_lock);
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free(buf);
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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->has_float;
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}
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static bool alsathread_find_float_format(snd_pcm_t *pcm,
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snd_pcm_hw_params_t *params)
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{
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if (snd_pcm_hw_params_test_format(pcm, params, SND_PCM_FORMAT_FLOAT) == 0)
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{
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RARCH_LOG("ALSA: Using floating point format.\n");
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return true;
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}
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RARCH_LOG("ALSA: Using signed 16-bit format.\n");
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return false;
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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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if (alsa->worker_thread)
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{
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alsa->thread_dead = true;
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sthread_join(alsa->worker_thread);
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}
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if (alsa->buffer)
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fifo_free(alsa->buffer);
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if (alsa->cond)
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scond_free(alsa->cond);
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if (alsa->fifo_lock)
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slock_free(alsa->fifo_lock);
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if (alsa->cond_lock)
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slock_free(alsa->cond_lock);
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if (alsa->pcm)
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{
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snd_pcm_drop(alsa->pcm);
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snd_pcm_close(alsa->pcm);
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}
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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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{
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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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return NULL;
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snd_pcm_hw_params_t *params = NULL;
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snd_pcm_sw_params_t *sw_params = NULL;
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const char *alsa_dev = "default";
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if (device)
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alsa_dev = device;
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unsigned latency_usec = latency * 1000 / 2;
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unsigned channels = 2;
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unsigned periods = 4;
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snd_pcm_uframes_t buffer_size;
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snd_pcm_format_t format;
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TRY_ALSA(snd_pcm_open(&alsa->pcm, alsa_dev, SND_PCM_STREAM_PLAYBACK, 0));
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TRY_ALSA(snd_pcm_hw_params_malloc(¶ms));
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alsa->has_float = alsathread_find_float_format(alsa->pcm, params);
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format = alsa->has_float ? SND_PCM_FORMAT_FLOAT : SND_PCM_FORMAT_S16;
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TRY_ALSA(snd_pcm_hw_params_any(alsa->pcm, params));
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TRY_ALSA(snd_pcm_hw_params_set_access(
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alsa->pcm, params, SND_PCM_ACCESS_RW_INTERLEAVED));
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TRY_ALSA(snd_pcm_hw_params_set_format(alsa->pcm, params, format));
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TRY_ALSA(snd_pcm_hw_params_set_channels(alsa->pcm, params, channels));
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TRY_ALSA(snd_pcm_hw_params_set_rate(alsa->pcm, params, rate, 0));
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TRY_ALSA(snd_pcm_hw_params_set_buffer_time_near(
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alsa->pcm, params, &latency_usec, NULL));
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TRY_ALSA(snd_pcm_hw_params_set_periods_near(
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alsa->pcm, params, &periods, NULL));
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TRY_ALSA(snd_pcm_hw_params(alsa->pcm, params));
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/* Shouldn't have to bother with this,
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* but some drivers are apparently broken. */
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if (snd_pcm_hw_params_get_period_size(params, &alsa->period_frames, NULL))
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snd_pcm_hw_params_get_period_size_min(
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params, &alsa->period_frames, NULL);
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RARCH_LOG("ALSA: Period size: %d frames\n", (int)alsa->period_frames);
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if (snd_pcm_hw_params_get_buffer_size(params, &buffer_size))
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snd_pcm_hw_params_get_buffer_size_max(params, &buffer_size);
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RARCH_LOG("ALSA: Buffer size: %d frames\n", (int)buffer_size);
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alsa->buffer_size = snd_pcm_frames_to_bytes(alsa->pcm, buffer_size);
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alsa->period_size = snd_pcm_frames_to_bytes(alsa->pcm, alsa->period_frames);
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TRY_ALSA(snd_pcm_sw_params_malloc(&sw_params));
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TRY_ALSA(snd_pcm_sw_params_current(alsa->pcm, sw_params));
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TRY_ALSA(snd_pcm_sw_params_set_start_threshold(
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alsa->pcm, sw_params, buffer_size / 2));
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TRY_ALSA(snd_pcm_sw_params(alsa->pcm, sw_params));
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snd_pcm_hw_params_free(params);
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snd_pcm_sw_params_free(sw_params);
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alsa->fifo_lock = slock_new();
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alsa->cond_lock = slock_new();
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alsa->cond = scond_new();
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alsa->buffer = fifo_new(alsa->buffer_size);
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if (!alsa->fifo_lock || !alsa->cond_lock || !alsa->cond || !alsa->buffer)
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goto error;
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alsa->worker_thread = sthread_create(alsa_worker_thread, alsa);
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if (!alsa->worker_thread)
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{
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RARCH_ERR("error initializing worker thread");
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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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if (params)
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snd_pcm_hw_params_free(params);
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if (sw_params)
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snd_pcm_sw_params_free(sw_params);
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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->thread_dead)
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return -1;
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if (alsa->nonblock)
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{
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slock_lock(alsa->fifo_lock);
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size_t avail = fifo_write_avail(alsa->buffer);
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size_t write_amt = min(avail, size);
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fifo_write(alsa->buffer, buf, write_amt);
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slock_unlock(alsa->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->thread_dead)
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{
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slock_lock(alsa->fifo_lock);
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size_t avail = fifo_write_avail(alsa->buffer);
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if (avail == 0)
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{
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slock_unlock(alsa->fifo_lock);
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slock_lock(alsa->cond_lock);
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if (!alsa->thread_dead)
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scond_wait(alsa->cond, alsa->cond_lock);
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slock_unlock(alsa->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->buffer, (const char*)buf + written, write_amt);
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slock_unlock(alsa->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)
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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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if (alsa->thread_dead)
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return 0;
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slock_lock(alsa->fifo_lock);
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size_t val = fifo_write_avail(alsa->buffer);
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slock_unlock(alsa->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->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_thread_write_avail,
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alsa_thread_buffer_size,
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};
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