libavdevice/alsa-audio-common.c File Reference

ALSA input and output: common code. More...

#include <alsa/asoundlib.h>
#include "libavformat/avformat.h"
#include "alsa-audio.h"

Go to the source code of this file.

Functions
static av_cold snd_pcm_format_t	codec_id_to_pcm_format (int codec_id)
av_cold int	ff_alsa_open (AVFormatContext *ctx, snd_pcm_stream_t mode, unsigned int *sample_rate, int channels, enum CodecID *codec_id)
	Opens an ALSA PCM.
av_cold int	ff_alsa_close (AVFormatContext *s1)
	Closes the ALSA PCM.
int	ff_alsa_xrun_recover (AVFormatContext *s1, int err)
	Tries to recover from ALSA buffer underrun.

---

Detailed Description

ALSA input and output: common code.

Author:

Luca Abeni ( lucabe72 email it )

Benoit Fouet ( benoit fouet free fr )

Nicolas George ( nicolas george normalesup org )

Definition in file alsa-audio-common.c.

---

Function Documentation

static av_cold snd_pcm_format_t codec_id_to_pcm_format

(

int

codec_id

)

[static]

Definition at line 36 of file alsa-audio-common.c.

Referenced by ff_alsa_open().

av_cold int ff_alsa_close

(

AVFormatContext *

s1

)

Closes the ALSA PCM.

Parameters:

s1

media file handle

Returns:

0

Definition at line 161 of file alsa-audio-common.c.

av_cold int ff_alsa_open	(	AVFormatContext *	s,
		snd_pcm_stream_t	mode,
		unsigned int *	sample_rate,
		int	channels,
		enum CodecID *	codec_id
	)

Opens an ALSA PCM.

Parameters:

	s	media file handle
	mode	either SND_PCM_STREAM_CAPTURE or SND_PCM_STREAM_PLAYBACK
	sample_rate	in: requested sample rate; out: actually selected sample rate
	channels	number of channels
	codec_id	in: requested CodecID or CODEC_ID_NONE; out: actually selected CodecID, changed only if CODEC_ID_NONE was requested

Returns:

0 if OK, AVERROR_xxx on error

Definition at line 46 of file alsa-audio-common.c.

Referenced by audio_read_header(), and audio_write_header().

int ff_alsa_xrun_recover	(	AVFormatContext *	s1,
		int	err
	)

Tries to recover from ALSA buffer underrun.

Parameters:

	s1	media file handle
	err	error code reported by the previous ALSA call

Returns:

0 if OK, AVERROR_xxx on error

Definition at line 169 of file alsa-audio-common.c.

Referenced by audio_read_packet(), and audio_write_packet().