FFmpeg
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#include <alsa/asoundlib.h>
#include "libavutil/internal.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/time.h"
#include "libavformat/demux.h"
#include "libavformat/internal.h"
#include "avdevice.h"
#include "alsa.h"
Go to the source code of this file.
Functions | |
static av_cold int | audio_read_header (AVFormatContext *s1) |
static int | audio_read_packet (AVFormatContext *s1, AVPacket *pkt) |
static int | audio_get_device_list (AVFormatContext *h, AVDeviceInfoList *device_list) |
Variables | |
static const AVOption | options [] |
static const AVClass | alsa_demuxer_class |
const FFInputFormat | ff_alsa_demuxer |
ALSA input and output: input
This avdevice decoder can capture audio from 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 capture period is set to the lower value available for the device, which gives a low latency suitable for real-time capture.
The PTS are an Unix time in microsecond.
Due to a bug in the ALSA library (https://bugtrack.alsa-project.org/alsa-bug/view.php?id=4308), this decoder does not work with certain ALSA plugins, especially the dsnoop plugin.
Definition in file alsa_dec.c.
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Definition at line 61 of file alsa_dec.c.
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Definition at line 102 of file alsa_dec.c.
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Definition at line 142 of file alsa_dec.c.
Definition at line 147 of file alsa_dec.c.
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Definition at line 153 of file alsa_dec.c.
const FFInputFormat ff_alsa_demuxer |
Definition at line 161 of file alsa_dec.c.