mirror of
https://github.com/CTCaer/RetroArch.git
synced 2024-12-24 11:45:16 +00:00
316 lines
8.2 KiB
C
316 lines
8.2 KiB
C
/* RetroArch - A frontend for libretro.
|
|
* Copyright (C) 2010-2013 - Hans-Kristian Arntzen
|
|
* Copyright (C) 2012-2013 - Michael Lelli
|
|
*
|
|
* RetroArch is free software: you can redistribute it and/or modify it under the terms
|
|
* of the GNU General Public License as published by the Free Software Found-
|
|
* ation, either version 3 of the License, or (at your option) any later version.
|
|
*
|
|
* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
|
|
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
|
|
* PURPOSE. See the GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along with RetroArch.
|
|
* If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
|
|
#include "../driver.h"
|
|
#include <stdlib.h>
|
|
#include <asoundlib.h>
|
|
#include "../general.h"
|
|
#include "../thread.h"
|
|
#include "../fifo_buffer.h"
|
|
|
|
#define TRY_ALSA(x) if (x < 0) { \
|
|
goto error; \
|
|
}
|
|
|
|
typedef struct alsa
|
|
{
|
|
snd_pcm_t *pcm;
|
|
bool nonblock;
|
|
bool has_float;
|
|
volatile bool thread_dead;
|
|
|
|
size_t buffer_size;
|
|
size_t period_size;
|
|
snd_pcm_uframes_t period_frames;
|
|
|
|
fifo_buffer_t *buffer;
|
|
sthread_t *worker_thread;
|
|
slock_t *fifo_lock;
|
|
scond_t *cond;
|
|
slock_t *cond_lock;
|
|
} alsa_t;
|
|
|
|
static void alsa_worker_thread(void *data)
|
|
{
|
|
alsa_t *alsa = (alsa_t*)data;
|
|
|
|
uint8_t *buf = (uint8_t *)calloc(1, alsa->period_size);
|
|
if (!buf)
|
|
{
|
|
RARCH_ERR("failed to allocate audio buffer");
|
|
goto end;
|
|
}
|
|
|
|
while (!alsa->thread_dead)
|
|
{
|
|
slock_lock(alsa->fifo_lock);
|
|
size_t avail = fifo_read_avail(alsa->buffer);
|
|
size_t fifo_size = min(alsa->period_size, avail);
|
|
fifo_read(alsa->buffer, buf, fifo_size);
|
|
scond_signal(alsa->cond);
|
|
slock_unlock(alsa->fifo_lock);
|
|
|
|
// If underrun, fill rest with silence.
|
|
memset(buf + fifo_size, 0, alsa->period_size - fifo_size);
|
|
|
|
snd_pcm_sframes_t frames = snd_pcm_writei(alsa->pcm, buf, alsa->period_frames);
|
|
|
|
if (frames == -EPIPE || frames == -EINTR || frames == -ESTRPIPE)
|
|
{
|
|
if (snd_pcm_recover(alsa->pcm, frames, 1) < 0)
|
|
{
|
|
RARCH_ERR("[ALSA]: (#2) Failed to recover from error (%s)\n",
|
|
snd_strerror(frames));
|
|
break;
|
|
}
|
|
|
|
continue;
|
|
}
|
|
else if (frames < 0)
|
|
{
|
|
RARCH_ERR("[ALSA]: Unknown error occured (%s).\n", snd_strerror(frames));
|
|
break;
|
|
}
|
|
}
|
|
|
|
end:
|
|
slock_lock(alsa->cond_lock);
|
|
alsa->thread_dead = true;
|
|
scond_signal(alsa->cond);
|
|
slock_unlock(alsa->cond_lock);
|
|
free(buf);
|
|
}
|
|
|
|
static bool alsa_use_float(void *data)
|
|
{
|
|
alsa_t *alsa = (alsa_t*)data;
|
|
return alsa->has_float;
|
|
}
|
|
|
|
static bool find_float_format(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
|
|
{
|
|
if (snd_pcm_hw_params_test_format(pcm, params, SND_PCM_FORMAT_FLOAT) == 0)
|
|
{
|
|
RARCH_LOG("ALSA: Using floating point format.\n");
|
|
return true;
|
|
}
|
|
RARCH_LOG("ALSA: Using signed 16-bit format.\n");
|
|
return false;
|
|
}
|
|
|
|
static void alsa_free(void *data)
|
|
{
|
|
alsa_t *alsa = (alsa_t*)data;
|
|
|
|
if (alsa)
|
|
{
|
|
if (alsa->worker_thread)
|
|
{
|
|
alsa->thread_dead = true;
|
|
sthread_join(alsa->worker_thread);
|
|
}
|
|
if (alsa->buffer)
|
|
fifo_free(alsa->buffer);
|
|
if (alsa->cond)
|
|
scond_free(alsa->cond);
|
|
if (alsa->fifo_lock)
|
|
slock_free(alsa->fifo_lock);
|
|
if (alsa->cond_lock)
|
|
slock_free(alsa->cond_lock);
|
|
if (alsa->pcm)
|
|
{
|
|
snd_pcm_drop(alsa->pcm);
|
|
snd_pcm_close(alsa->pcm);
|
|
}
|
|
free(alsa);
|
|
}
|
|
}
|
|
|
|
static void *alsa_init(const char *device, unsigned rate, unsigned latency)
|
|
{
|
|
alsa_t *alsa = (alsa_t*)calloc(1, sizeof(alsa_t));
|
|
if (!alsa)
|
|
return NULL;
|
|
|
|
snd_pcm_hw_params_t *params = NULL;
|
|
snd_pcm_sw_params_t *sw_params = NULL;
|
|
|
|
const char *alsa_dev = "default";
|
|
if (device)
|
|
alsa_dev = device;
|
|
|
|
unsigned latency_usec = latency * 1000 / 2;
|
|
|
|
unsigned channels = 2;
|
|
unsigned periods = 4;
|
|
snd_pcm_uframes_t buffer_size;
|
|
snd_pcm_format_t format;
|
|
|
|
TRY_ALSA(snd_pcm_open(&alsa->pcm, alsa_dev, SND_PCM_STREAM_PLAYBACK, 0));
|
|
|
|
TRY_ALSA(snd_pcm_hw_params_malloc(¶ms));
|
|
alsa->has_float = find_float_format(alsa->pcm, params);
|
|
format = alsa->has_float ? SND_PCM_FORMAT_FLOAT : SND_PCM_FORMAT_S16;
|
|
|
|
TRY_ALSA(snd_pcm_hw_params_any(alsa->pcm, params));
|
|
TRY_ALSA(snd_pcm_hw_params_set_access(alsa->pcm, params, SND_PCM_ACCESS_RW_INTERLEAVED));
|
|
TRY_ALSA(snd_pcm_hw_params_set_format(alsa->pcm, params, format));
|
|
TRY_ALSA(snd_pcm_hw_params_set_channels(alsa->pcm, params, channels));
|
|
TRY_ALSA(snd_pcm_hw_params_set_rate(alsa->pcm, params, rate, 0));
|
|
|
|
TRY_ALSA(snd_pcm_hw_params_set_buffer_time_near(alsa->pcm, params, &latency_usec, NULL));
|
|
TRY_ALSA(snd_pcm_hw_params_set_periods_near(alsa->pcm, params, &periods, NULL));
|
|
|
|
TRY_ALSA(snd_pcm_hw_params(alsa->pcm, params));
|
|
|
|
snd_pcm_hw_params_get_period_size(params, &alsa->period_frames, NULL);
|
|
RARCH_LOG("ALSA: Period size: %d frames\n", (int)alsa->period_frames);
|
|
snd_pcm_hw_params_get_buffer_size(params, &buffer_size);
|
|
RARCH_LOG("ALSA: Buffer size: %d frames\n", (int)buffer_size);
|
|
alsa->buffer_size = snd_pcm_frames_to_bytes(alsa->pcm, buffer_size);
|
|
alsa->period_size = snd_pcm_frames_to_bytes(alsa->pcm, alsa->period_frames);
|
|
|
|
TRY_ALSA(snd_pcm_sw_params_malloc(&sw_params));
|
|
TRY_ALSA(snd_pcm_sw_params_current(alsa->pcm, sw_params));
|
|
TRY_ALSA(snd_pcm_sw_params_set_start_threshold(alsa->pcm, sw_params, buffer_size / 2));
|
|
TRY_ALSA(snd_pcm_sw_params(alsa->pcm, sw_params));
|
|
|
|
snd_pcm_hw_params_free(params);
|
|
snd_pcm_sw_params_free(sw_params);
|
|
|
|
alsa->fifo_lock = slock_new();
|
|
alsa->cond_lock = slock_new();
|
|
alsa->cond = scond_new();
|
|
alsa->buffer = fifo_new(alsa->buffer_size);
|
|
if (!alsa->fifo_lock || !alsa->cond_lock || !alsa->cond || !alsa->buffer)
|
|
goto error;
|
|
|
|
alsa->worker_thread = sthread_create(alsa_worker_thread, alsa);
|
|
if (!alsa->worker_thread)
|
|
{
|
|
RARCH_ERR("error initializing worker thread");
|
|
goto error;
|
|
}
|
|
|
|
return alsa;
|
|
|
|
error:
|
|
RARCH_ERR("ALSA: Failed to initialize...\n");
|
|
if (params)
|
|
snd_pcm_hw_params_free(params);
|
|
|
|
if (sw_params)
|
|
snd_pcm_sw_params_free(sw_params);
|
|
|
|
alsa_free(alsa);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static ssize_t alsa_write(void *data, const void *buf, size_t size)
|
|
{
|
|
alsa_t *alsa = (alsa_t*)data;
|
|
|
|
if (alsa->thread_dead)
|
|
return -1;
|
|
|
|
if (alsa->nonblock)
|
|
{
|
|
slock_lock(alsa->fifo_lock);
|
|
size_t avail = fifo_write_avail(alsa->buffer);
|
|
size_t write_amt = min(avail, size);
|
|
fifo_write(alsa->buffer, buf, write_amt);
|
|
slock_unlock(alsa->fifo_lock);
|
|
return write_amt;
|
|
}
|
|
else
|
|
{
|
|
size_t written = 0;
|
|
while (written < size && !alsa->thread_dead)
|
|
{
|
|
slock_lock(alsa->fifo_lock);
|
|
size_t avail = fifo_write_avail(alsa->buffer);
|
|
|
|
if (avail == 0)
|
|
{
|
|
slock_unlock(alsa->fifo_lock);
|
|
slock_lock(alsa->cond_lock);
|
|
if (!alsa->thread_dead)
|
|
scond_wait(alsa->cond, alsa->cond_lock);
|
|
slock_unlock(alsa->cond_lock);
|
|
}
|
|
else
|
|
{
|
|
size_t write_amt = min(size - written, avail);
|
|
fifo_write(alsa->buffer, (const char*)buf + written, write_amt);
|
|
slock_unlock(alsa->fifo_lock);
|
|
written += write_amt;
|
|
}
|
|
}
|
|
return written;
|
|
}
|
|
}
|
|
|
|
static bool alsa_stop(void *data)
|
|
{
|
|
(void)data;
|
|
return true;
|
|
}
|
|
|
|
static void alsa_set_nonblock_state(void *data, bool state)
|
|
{
|
|
alsa_t *alsa = (alsa_t*)data;
|
|
alsa->nonblock = state;
|
|
}
|
|
|
|
static bool alsa_start(void *data)
|
|
{
|
|
(void)data;
|
|
return true;
|
|
}
|
|
|
|
static size_t alsa_write_avail(void *data)
|
|
{
|
|
alsa_t *alsa = (alsa_t*)data;
|
|
|
|
if (alsa->thread_dead)
|
|
return 0;
|
|
slock_lock(alsa->fifo_lock);
|
|
size_t val = fifo_write_avail(alsa->buffer);
|
|
slock_unlock(alsa->fifo_lock);
|
|
return val;
|
|
}
|
|
|
|
static size_t alsa_buffer_size(void *data)
|
|
{
|
|
alsa_t *alsa = (alsa_t*)data;
|
|
return alsa->buffer_size;
|
|
}
|
|
|
|
const audio_driver_t audio_alsathread = {
|
|
alsa_init,
|
|
alsa_write,
|
|
alsa_stop,
|
|
alsa_start,
|
|
alsa_set_nonblock_state,
|
|
alsa_free,
|
|
alsa_use_float,
|
|
"alsathread",
|
|
alsa_write_avail,
|
|
alsa_buffer_size,
|
|
};
|