alsa-audio-enc.c File Reference

ALSA input and output: output. More...

#include <alsa/asoundlib.h>
#include "libavutil/time.h"
#include "libavformat/internal.h"
#include "avdevice.h"
#include "alsa-audio.h"
Include dependency graph for alsa-audio-enc.c:

Go to the source code of this file.

Functions

static av_cold int audio_write_header (AVFormatContext *s1)
 
static int audio_write_packet (AVFormatContext *s1, AVPacket *pkt)
 
static void audio_get_output_timestamp (AVFormatContext *s1, int stream, int64_t *dts, int64_t *wall)
 

Variables

AVOutputFormat ff_alsa_muxer
 

Detailed Description

ALSA input and output: output.

Author
Luca Abeni ( lucabe72 email it )
Benoit Fouet ( benoit fouet free fr )

This avdevice encoder allows to play audio to an ALSA (Advanced Linux Sound Architecture) device.

The filename parameter is the name of an ALSA PCM device capable of capture, for example "default" or "plughw:1"; see the ALSA documentation for naming conventions. The empty string is equivalent to "default".

The playback period is set to the lower value available for the device, which gives a low latency suitable for real-time playback.

Definition in file alsa-audio-enc.c.

Function Documentation

static void audio_get_output_timestamp ( AVFormatContext s1,
int  stream,
int64_t *  dts,
int64_t *  wall 
)
static

Definition at line 108 of file alsa-audio-enc.c.

static av_cold int audio_write_header ( AVFormatContext s1)
static

Definition at line 47 of file alsa-audio-enc.c.

static int audio_write_packet ( AVFormatContext s1,
AVPacket pkt 
)
static

Definition at line 75 of file alsa-audio-enc.c.

Variable Documentation

AVOutputFormat ff_alsa_muxer
Initial value:
= {
.name = "alsa",
.long_name = NULL_IF_CONFIG_SMALL("ALSA audio output"),
.priv_data_size = sizeof(AlsaData),
.audio_codec = DEFAULT_CODEC_ID,
.video_codec = AV_CODEC_ID_NONE,
.get_output_timestamp = audio_get_output_timestamp,
}
static int write_packet(AVFormatContext *s, AVPacket *pkt)
av_cold int ff_alsa_close(AVFormatContext *s1)
Close the ALSA PCM.
static void audio_get_output_timestamp(AVFormatContext *s1, int stream, int64_t *dts, int64_t *wall)
static int write_trailer(AVFormatContext *s)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
static av_cold int audio_write_header(AVFormatContext *s1)
struct AlsaData AlsaData
static int audio_write_packet(AVFormatContext *s1, AVPacket *pkt)
static int flags
Definition: cpu.c:23
#define DEFAULT_CODEC_ID
Definition: alsa-audio.h:42
#define AVFMT_NOFILE
Demuxer will use avio_open, no opened file should be provided by the caller.
Definition: avformat.h:345
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:470

Definition at line 118 of file alsa-audio-enc.c.