af_amix.c File Reference

Audio Mix Filter. More...

#include "libavutil/attributes.h"
#include "libavutil/audio_fifo.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/float_dsp.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/samplefmt.h"
#include "audio.h"
#include "avfilter.h"
#include "filters.h"
#include "formats.h"
#include "internal.h"

Classes
struct	FrameInfo
struct	FrameList
	Linked list used to store timestamps and frame sizes of all frames in the FIFO for the first input. More...
struct	MixContext

Macros
#define	INPUT_ON   1
	input is active
#define	INPUT_EOF   2
	input has reached EOF (may still be active)
#define	DURATION_LONGEST   0
#define	DURATION_SHORTEST   1
#define	DURATION_FIRST   2
#define	OFFSET(x)   offsetof(MixContext, x)
#define	A   AV_OPT_FLAG_AUDIO_PARAM
#define	F   AV_OPT_FLAG_FILTERING_PARAM

Typedefs
typedef struct FrameInfo	FrameInfo
typedef struct FrameList	FrameList
	Linked list used to store timestamps and frame sizes of all frames in the FIFO for the first input. More...
typedef struct MixContext	MixContext

Functions
	AVFILTER_DEFINE_CLASS (amix)

Variables
AVFilter	ff_af_amix

Detailed Description

Audio Mix Filter.

Mixes audio from multiple sources into a single output. The channel layout, sample rate, and sample format will be the same for all inputs and the output.

Typedef Documentation

FrameList

typedef struct FrameList FrameList

Linked list used to store timestamps and frame sizes of all frames in the FIFO for the first input.

This is needed to keep timestamps synchronized for the case where multiple input frames are pushed to the filter for processing before a frame is requested by the output link.

Variable Documentation

ff_af_amix

AVFilter ff_af_amix

Initial value:

= {
    .name           = "amix",
    .description    = NULL_IF_CONFIG_SMALL("Audio mixing."),
    .priv_size      = sizeof(MixContext),
    .priv_class     = &amix_class,
    .init           = init,
    .uninit         = uninit,
    .activate       = activate,
    .query_formats  = query_formats,
    .inputs         = NULL,
    .outputs        = avfilter_af_amix_outputs,
    .flags          = AVFILTER_FLAG_DYNAMIC_INPUTS,
}