alsa.h File Reference

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

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

Go to the source code of this file.

Data Structures
struct	AlsaData

Macros
#define	DEFAULT_CODEC_ID   AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE)
#define	ALSA_BUFFER_SIZE_MAX   131072

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

Functions
av_warn_unused_result int	ff_alsa_open (AVFormatContext *s, snd_pcm_stream_t mode, unsigned int *sample_rate, AVChannelLayout *layout, enum AVCodecID *codec_id)
	Open an ALSA PCM.
int	ff_alsa_close (AVFormatContext *s1)
	Close the ALSA PCM.
av_warn_unused_result int	ff_alsa_xrun_recover (AVFormatContext *s1, int err)
	Try to recover from ALSA buffer underrun.
av_warn_unused_result int	ff_alsa_extend_reorder_buf (AlsaData *s, int size)
av_warn_unused_result int	ff_alsa_get_device_list (AVDeviceInfoList *device_list, snd_pcm_stream_t stream_type)

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.h.

Macro Definition Documentation

DEFAULT_CODEC_ID

#define DEFAULT_CODEC_ID   AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE)

Definition at line 43 of file alsa.h.

Referenced by ff_alsa_open(), and pulse_read_header().

ALSA_BUFFER_SIZE_MAX

#define ALSA_BUFFER_SIZE_MAX   131072

Definition at line 47 of file alsa.h.

Referenced by ff_alsa_open().

Typedef Documentation

ff_reorder_func

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

Definition at line 45 of file alsa.h.

Function Documentation

ff_alsa_open()

av_warn_unused_result int ff_alsa_open	(	AVFormatContext *	s,
		snd_pcm_stream_t	mode,
		unsigned int *	sample_rate,
		AVChannelLayout *	layout,
		enum AVCodecID *	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
layout	in: requested channel layout, or nb_channels=0 for auto-detect; out: actually selected channel layout
codec_id	in: requested AVCodecID or AV_CODEC_ID_NONE; out: actually selected AVCodecID, changed only if AV_CODEC_ID_NONE was requested

Returns

0 if OK, AVERROR_xxx on error

Definition at line 256 of file alsa.c.

Referenced by audio_read_header(), and audio_write_header().

ff_alsa_close()

int ff_alsa_close

(

AVFormatContext *

s1

)

Close the ALSA PCM.

Parameters

s1	media file handle

Returns

0

Definition at line 421 of file alsa.c.

ff_alsa_xrun_recover()

av_warn_unused_result 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 437 of file alsa.c.

Referenced by audio_read_packet(), and audio_write_packet().

ff_alsa_extend_reorder_buf()

av_warn_unused_result int ff_alsa_extend_reorder_buf	(	AlsaData *	s,
		int	size )

Definition at line 460 of file alsa.c.

Referenced by audio_write_packet().

ff_alsa_get_device_list()

av_warn_unused_result int ff_alsa_get_device_list	(	AVDeviceInfoList *	device_list,
		snd_pcm_stream_t	stream_type )

Definition at line 477 of file alsa.c.

Referenced by audio_get_device_list(), and audio_get_device_list().