libavdevice/alsa-audio.h File Reference

ALSA input and output: definitions and structures. More...

#include <alsa/asoundlib.h>
#include "config.h"
#include "libavutil/log.h"
#include "avdevice.h"

Go to the source code of this file.

Data Structures
struct	AlsaData
Defines
#define	DEFAULT_CODEC_ID   AV_NE(CODEC_ID_PCM_S16BE, CODEC_ID_PCM_S16LE)
#define	ALSA_BUFFER_SIZE_MAX   65536
Typedefs
typedef void(*	ff_reorder_func )(const void *, void *, int)
Functions
int	ff_alsa_open (AVFormatContext *s, snd_pcm_stream_t mode, unsigned int *sample_rate, int channels, enum CodecID *codec_id)
	Open an ALSA PCM.
int	ff_alsa_close (AVFormatContext *s1)
	Close the ALSA PCM.
int	ff_alsa_xrun_recover (AVFormatContext *s1, int err)
	Try to recover from ALSA buffer underrun.
int	ff_alsa_extend_reorder_buf (AlsaData *s, int size)

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Detailed Description

ALSA input and output: definitions and structures.

Author:

Luca Abeni ( lucabe72 email it )

Benoit Fouet ( benoit fouet free fr )

Definition in file alsa-audio.h.

---

Define Documentation

#define ALSA_BUFFER_SIZE_MAX   65536

Definition at line 45 of file alsa-audio.h.

Referenced by ff_alsa_open().

#define DEFAULT_CODEC_ID   AV_NE(CODEC_ID_PCM_S16BE, CODEC_ID_PCM_S16LE)

Definition at line 41 of file alsa-audio.h.

Referenced by ff_alsa_open().

---

Typedef Documentation

typedef void(* ff_reorder_func)(const void *, void *, int)

Definition at line 43 of file alsa-audio.h.

---

Function Documentation

int ff_alsa_close

(

AVFormatContext *

s1

)

Close the ALSA PCM.

Parameters:

s1

media file handle

Returns:

0

Definition at line 307 of file alsa-audio-common.c.

int ff_alsa_extend_reorder_buf	(	AlsaData *	s,
		int	size
	)

Definition at line 337 of file alsa-audio-common.c.

Referenced by audio_write_packet().

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

Open 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 170 of file alsa-audio-common.c.

Referenced by audio_read_header(), and audio_write_header().

int ff_alsa_xrun_recover	(	AVFormatContext *	s1,
		int	err
	)

Try 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 316 of file alsa-audio-common.c.

Referenced by audio_read_packet(), and audio_write_packet().