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"

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, int channels, enum AVCodecID *codec_id)
	Open an ALSA PCM. More...
int	ff_alsa_close (AVFormatContext *s1)
	Close the ALSA PCM. More...
av_warn_unused_result int	ff_alsa_xrun_recover (AVFormatContext *s1, int err)
	Try to recover from ALSA buffer underrun. More...
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

#define DEFAULT_CODEC_ID   AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE)

Definition at line 42 of file alsa.h.

Referenced by ff_alsa_open().

#define ALSA_BUFFER_SIZE_MAX   131072

Definition at line 46 of file alsa.h.

Referenced by ff_alsa_open().

Typedef Documentation

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

Definition at line 44 of file alsa.h.

Function Documentation

av_warn_unused_result int ff_alsa_open	(	AVFormatContext *	s,
		snd_pcm_stream_t	mode,
		unsigned int *	sample_rate,
		int	channels,
		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
channels	number of channels
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 167 of file alsa.c.

Referenced by audio_read_header(), and audio_write_header().

int ff_alsa_close

(

AVFormatContext *

s1

)

Close the ALSA PCM.

Parameters

s1	media file handle

Returns

0

Definition at line 299 of file alsa.c.

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 312 of file alsa.c.

Referenced by audio_read_packet(), and audio_write_packet().

av_warn_unused_result int ff_alsa_extend_reorder_buf	(	AlsaData *	s,
		int	size
	)

Definition at line 333 of file alsa.c.

Referenced by audio_write_packet().

av_warn_unused_result int ff_alsa_get_device_list	(	AVDeviceInfoList *	device_list,
		snd_pcm_stream_t	stream_type
	)

Definition at line 350 of file alsa.c.

Referenced by audio_get_device_list().