alsa_enc.c File Reference

ALSA input and output: output. More...

#include <alsa/asoundlib.h>
#include "libavutil/internal.h"
#include "libavutil/time.h"
#include "libavformat/internal.h"
#include "avdevice.h"
#include "alsa.h"

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 can 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.

Variable Documentation

ff_alsa_muxer

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,
    .write_header   = audio_write_header,
    .write_packet   = audio_write_packet,
    .write_trailer  = ff_alsa_close,
    .write_uncoded_frame = audio_write_frame,
    .get_device_list = audio_get_device_list,
    .get_output_timestamp = audio_get_output_timestamp,
    .flags          = AVFMT_NOFILE,
    .priv_class     = &alsa_muxer_class,
}