mpv/libao2/ao_alsa9.c

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/*
ao_alsa9 - ALSA-0.9.x output plugin for MPlayer
(C) Alex Beregszaszi <alex@naxine.org>
*/
#include <errno.h>
#include <sys/asoundlib.h>
#include "../config.h"
#include "audio_out.h"
#include "audio_out_internal.h"
#include "afmt.h"
extern int verbose;
static ao_info_t info =
{
"ALSA-0.9.x audio output",
"alsa9",
"Alex Beregszaszi <alex@naxine.org>",
"under developement"
};
LIBAO_EXTERN(alsa9)
/* global variables:
ao_samplerate
ao_channels
ao_format
ao_bps
ao_outburst
ao_buffersize
*/
static snd_pcm_t *alsa_handler;
static snd_pcm_format_t alsa_format;
static snd_pcm_hw_params_t *alsa_hwparams;
static snd_pcm_sw_params_t *alsa_swparams;
static char *alsa_device;
#define ALSA_DEVICE_SIZE 48
/* to set/get/query special features/parameters */
static int control(int cmd, int arg)
{
switch(cmd)
{
case AOCONTROL_GET_DEVICE:
return(char *)alsa_device; /* egy kicsit brutalis, dehat :) */
case AOCONTROL_SET_DEVICE:
strncpy(alsa_device, (char *)arg, ALSA_DEVICE_SIZE);
break;
}
return(CONTROL_UNKNOWN);
}
/*
open & setup audio device
return: 1=success 0=fail
*/
static int init(int rate_hz, int channels, int format, int flags)
{
int err;
int cards = -1;
snd_pcm_info_t *alsa_info;
int chunck_size;
printf("alsa-init: requested format: %d Hz, %d channels, %s\n", rate_hz,
channels, audio_out_format_name(format));
alsa_handler = NULL;
if (verbose)
printf("alsa-init: compiled for ALSA-%s (%d)\n", SND_LIB_VERSION_STR,
SND_LIB_VERSION);
if ((err = snd_card_next(&cards)) < 0 || cards < 0)
{
printf("alsa-init: no soundcards found: %s\n", snd_strerror(err));
return(0);
}
ao_format = format;
ao_channels = channels - 1;
ao_samplerate = rate_hz;
ao_bps = ao_samplerate*(ao_channels+1);
ao_outburst = OUTBURST;
ao_buffersize = 16384;
memset(&alsa_format, 0, sizeof(alsa_format));
switch (format)
{
case AFMT_S8:
alsa_format = SND_PCM_FORMAT_S8;
break;
case AFMT_U8:
alsa_format = SND_PCM_FORMAT_U8;
break;
case AFMT_U16_LE:
alsa_format = SND_PCM_FORMAT_U16_LE;
break;
case AFMT_U16_BE:
alsa_format = SND_PCM_FORMAT_U16_BE;
break;
case AFMT_S16_LE:
alsa_format = SND_PCM_FORMAT_S16_LE;
break;
case AFMT_S16_BE:
alsa_format = SND_PCM_FORMAT_S16_BE;
break;
default:
alsa_format = SND_PCM_FORMAT_MPEG;
break;
}
switch(alsa_format)
{
case SND_PCM_FORMAT_S16_LE:
case SND_PCM_FORMAT_U16_LE:
ao_bps *= 2;
break;
case -1:
printf("alsa-init: invalid format (%s) requested - output disabled\n",
audio_out_format_name(format));
return(0);
}
if ((err = snd_pcm_info_malloc(&alsa_info)) < 0)
{
printf("alsa-init: memory allocation error: %s\n", snd_strerror(err));
return(0);
}
if ((alsa_device = malloc(ALSA_DEVICE_SIZE)) == NULL)
{
printf("alsa-init: memory allocation error: %s\n", strerror(errno));
return(0);
}
snprintf(alsa_device, ALSA_DEVICE_SIZE, "hw:%d,%d",
snd_pcm_info_get_device(alsa_info),
snd_pcm_info_get_subdevice(alsa_info));
snd_pcm_info_free(alsa_info);
printf("alsa-init: %d soundcard%s found, using: %s\n", cards+1,
(cards >= 0) ? "" : "s", alsa_device);
if ((err = snd_pcm_open(&alsa_handler, alsa_device, SND_PCM_STREAM_PLAYBACK,
0)) < 0)
{
printf("alsa-init: playback open error: %s\n", snd_strerror(err));
return(0);
}
snd_pcm_hw_params_malloc(&alsa_hwparams);
snd_pcm_sw_params_malloc(&alsa_swparams);
if ((err = snd_pcm_hw_params_any(alsa_handler, alsa_hwparams)) < 0)
{
printf("alsa-init: unable to get initial parameters: %s\n",
snd_strerror(err));
return(0);
}
if ((err = snd_pcm_hw_params_set_access(alsa_handler, alsa_hwparams,
SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
{
printf("alsa-init: unable to set access type: %s\n",
snd_strerror(err));
return(0);
}
if ((err = snd_pcm_hw_params_set_format(alsa_handler, alsa_hwparams,
alsa_format)) < 0)
{
printf("alsa-init: unable to set format: %s\n",
snd_strerror(err));
return(0);
}
if ((err = snd_pcm_hw_params_set_channels(alsa_handler, alsa_hwparams,
ao_channels)) < 0)
{
printf("alsa-init: unable to set channels: %s\n",
snd_strerror(err));
return(0);
}
if ((err = snd_pcm_hw_params_set_rate(alsa_handler, alsa_hwparams,
ao_samplerate, 0)) < 0)
{
printf("alsa-init: unable to set channels: %s\n",
snd_strerror(err));
return(0);
}
#ifdef buffersize
if ((err = snd_pcm_hw_params_get_buffer_size(alsa_hwparams)) < 0)
{
printf("alsa-init: unable to get buffer size: %s\n",
snd_strerror(err));
return(0);
} else
ao_buffersize = err;
#endif
#ifdef buffertime
{
int alsa_buffer_time = 60;
if ((err = snd_pcm_hw_params_set_buffer_time_near(alsa_handler, alsa_hwparams,
alsa_buffer_time, 0)) < 0)
{
printf("alsa-init: unable to set buffer time near: %s\n",
snd_strerror(err));
return(0);
} else
alsa_buffer_time = err;
if ((err = snd_pcm_hw_params_set_period_time_near(alsa_handler, alsa_hwparams,
alsa_buffer_time/ao_bps, 0)) < 0)
{
printf("alsa-init: unable to set period time: %s\n",
snd_strerror(err));
return(0);
}
}
#endif
if ((err = snd_pcm_hw_params(alsa_handler, alsa_hwparams)) < 0)
{
printf("alsa-init: unable to set parameters: %s\n",
snd_strerror(err));
return(0);
}
if ((err = snd_pcm_sw_params_current(alsa_handler, alsa_swparams)) < 0)
{
printf("alsa-init: unable to get parameters: %s\n",
snd_strerror(err));
return(0);
}
if ((err = snd_pcm_sw_params_set_start_mode(alsa_handler, alsa_swparams,
SND_PCM_START_DATA)) < 0)
{
printf("alsa-init: unable to set start mode: %s\n",
snd_strerror(err));
return(0);
}
if ((err = snd_pcm_sw_params(alsa_handler, alsa_swparams)) < 0)
{
printf("alsa-init: unable to set parameters: %s\n",
snd_strerror(err));
return(0);
}
snd_pcm_sw_params_default(alsa_handler, alsa_swparams);
if ((err = snd_pcm_prepare(alsa_handler)) < 0)
{
printf("alsa-init: pcm prepare error: %s\n", snd_strerror(err));
return(0);
}
if ((err = snd_pcm_start(alsa_handler)) < 0)
{
printf("alsa-init: pcm start error: %s\n", snd_strerror(err));
if (err != -EPIPE)
return(0);
if ((err = snd_pcm_start(alsa_handler)) < 0)
{
printf("alsa-init: pcm start error: %s\n", snd_strerror(err));
return(0);
}
}
printf("AUDIO: %d Hz/%d channels/%d bps/%d bytes buffer/%s\n",
ao_samplerate, ao_channels+1, ao_bps, ao_buffersize,
snd_pcm_format_description(alsa_format));
return(1);
}
/* close audio device */
static void uninit()
{
int err;
if (alsa_device != NULL)
free(alsa_device);
snd_pcm_hw_params_free(alsa_hwparams);
snd_pcm_sw_params_free(alsa_swparams);
if ((err = snd_pcm_drain(alsa_handler)) < 0)
{
printf("alsa-uninit: pcm drain error: %s\n", snd_strerror(err));
return;
}
if ((err = snd_pcm_reset(alsa_handler)) < 0)
{
printf("alsa-uninit: pcm reset error: %s\n", snd_strerror(err));
return;
}
if ((err = snd_pcm_close(alsa_handler)) < 0)
{
printf("alsa-uninit: pcm close error: %s\n", snd_strerror(err));
return;
}
}
static void audio_pause()
{
int err;
if ((err = snd_pcm_drain(alsa_handler)) < 0)
{
printf("alsa-pause: pcm drain error: %s\n", snd_strerror(err));
return;
}
if ((err = snd_pcm_reset(alsa_handler)) < 0)
{
printf("alsa-pause: pcm reset error: %s\n", snd_strerror(err));
return;
}
}
static void audio_resume()
{
int err;
if ((err = snd_pcm_prepare(alsa_handler)) < 0)
{
printf("alsa-resume: pcm prepare error: %s\n", snd_strerror(err));
return;
}
if ((err = snd_pcm_start(alsa_handler)) < 0)
{
printf("alsa-resume: pcm start error: %s\n", snd_strerror(err));
return;
}
}
/* stop playing and empty buffers (for seeking/pause) */
static void reset()
{
int err;
if ((err = snd_pcm_drain(alsa_handler)) < 0)
{
printf("alsa-reset: pcm drain error: %s\n", snd_strerror(err));
return;
}
if ((err = snd_pcm_reset(alsa_handler)) < 0)
{
printf("alsa-reset: pcm reset error: %s\n", snd_strerror(err));
return;
}
if ((err = snd_pcm_prepare(alsa_handler)) < 0)
{
printf("alsa-reset: pcm prepare error: %s\n", snd_strerror(err));
return;
}
if ((err = snd_pcm_start(alsa_handler)) < 0)
{
printf("alsa-reset: pcm start error: %s\n", snd_strerror(err));
return;
}
}
/*
plays 'len' bytes of 'data'
returns: number of bytes played
*/
static int play(void* data, int len, int flags)
{
if ((len = snd_pcm_writei(alsa_handler, data, len)) != len)
{
if (len == -EPIPE) /* underrun? */
{
printf("alsa-play: alsa underrun, resetting stream\n");
if ((len = snd_pcm_prepare(alsa_handler)) < 0)
{
printf("alsa-play: playback prepare error: %s\n", snd_strerror(len));
return(0);
}
if ((len = snd_pcm_writei(alsa_handler, data, len)) != len)
{
printf("alsa-play: write error after reset: %s - giving up\n",
snd_strerror(len));
return(0);
}
return(len); /* 2nd write was ok */
}
printf("alsa-play: output error: %s\n", snd_strerror(len));
}
return(len);
}
/* how many byes are free in the buffer */
static int get_space()
{
snd_pcm_status_t *status;
int ret;
if ((ret = snd_pcm_status_malloc(&status)) < 0)
{
printf("alsa-space: memory allocation error: %s\n", snd_strerror(ret));
return(0);
}
if ((ret = snd_pcm_status(alsa_handler, status)) < 0)
{
printf("alsa-space: cannot get pcm status: %s\n", snd_strerror(ret));
return(0);
}
switch(snd_pcm_status_get_state(status))
{
case SND_PCM_STATE_OPEN:
case SND_PCM_STATE_PREPARED:
case SND_PCM_STATE_RUNNING:
ret = snd_pcm_status_get_avail(status) * ao_bps;
break;
default:
ret = 0;
}
snd_pcm_status_free(status);
return(ret);
}
/* how many unplayed bytes are in the buffer */
static int get_delay()
{
snd_pcm_status_t *status;
int ret;
if ((ret = snd_pcm_status_malloc(&status)) < 0)
{
printf("alsa-delay: memory allocation error: %s\n", snd_strerror(ret));
return(0);
}
if ((ret = snd_pcm_status(alsa_handler, status)) < 0)
{
printf("alsa-delay: cannot get pcm status: %s\n", snd_strerror(ret));
return(0);
}
switch(snd_pcm_status_get_state(status))
{
case SND_PCM_STATE_OPEN:
case SND_PCM_STATE_PREPARED:
case SND_PCM_STATE_RUNNING:
ret = snd_pcm_status_get_delay(status) * ao_bps;
break;
default:
ret = 0;
}
snd_pcm_status_free(status);
return(ret);
}