af_channelsplit.c File Reference

Channel split filter. More...

#include "libavutil/avassert.h"
#include "libavutil/attributes.h"
#include "libavutil/channel_layout.h"
#include "libavutil/internal.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "audio.h"
#include "avfilter.h"
#include "filters.h"
#include "formats.h"

Go to the source code of this file.

Data Structures
struct	ChannelSplitContext

Macros
#define	OFFSET(x)
#define	A   AV_OPT_FLAG_AUDIO_PARAM
#define	F   AV_OPT_FLAG_FILTERING_PARAM

Functions
	AVFILTER_DEFINE_CLASS (channelsplit)
static av_cold int	init (AVFilterContext *ctx)
static av_cold void	uninit (AVFilterContext *ctx)
static int	query_formats (const AVFilterContext *ctx, AVFilterFormatsConfig **cfg_in, AVFilterFormatsConfig **cfg_out)
static int	filter_frame (AVFilterLink *outlink, AVFrame *buf)
static int	activate (AVFilterContext *ctx)

Variables
static const AVOption	channelsplit_options []
const FFFilter	ff_af_channelsplit

Detailed Description

Channel split filter.

Split an audio stream into per-channel streams.

Definition in file af_channelsplit.c.

Macro Definition Documentation

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(ChannelSplitContext, x)

Definition at line 46 of file af_channelsplit.c.

A

#define A   AV_OPT_FLAG_AUDIO_PARAM

Definition at line 47 of file af_channelsplit.c.

F

#define F   AV_OPT_FLAG_FILTERING_PARAM

Definition at line 48 of file af_channelsplit.c.

Function Documentation

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

channelsplit

)

init()

static av_cold int init ( AVFilterContext * ctx )

static

Definition at line 57 of file af_channelsplit.c.

uninit()

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 113 of file af_channelsplit.c.

query_formats()

static int query_formats ( const AVFilterContext * ctx, AVFilterFormatsConfig ** cfg_in, AVFilterFormatsConfig ** cfg_out )

static

Definition at line 121 of file af_channelsplit.c.

filter_frame()

static int filter_frame ( AVFilterLink * outlink, AVFrame * buf )

static

Definition at line 169 of file af_channelsplit.c.

Referenced by activate().

activate()

static int activate ( AVFilterContext * ctx )

static

Definition at line 193 of file af_channelsplit.c.

Variable Documentation

channelsplit_options

const AVOption channelsplit_options[]

static

Initial value:

= {
    { "channel_layout", "Input channel layout.", OFFSET(channel_layout),   AV_OPT_TYPE_CHLAYOUT, { .str = "stereo" }, .flags = A|F },
    { "channels",        "Channels to extract.", OFFSET(channels_str),       AV_OPT_TYPE_STRING, { .str = "all" },    .flags = A|F },
    { NULL }
}

Definition at line 49 of file af_channelsplit.c.

ff_af_channelsplit

const FFFilter ff_af_channelsplit

Initial value:

= {
    .p.name         = "channelsplit",
    .p.description  = NULL_IF_CONFIG_SMALL("Split audio into per-channel streams."),
    .p.priv_class   = &channelsplit_class,
    .p.flags        = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
    .priv_size      = sizeof(ChannelSplitContext),
    .init           = init,
    .activate       = activate,
    .uninit         = uninit,
    FILTER_INPUTS(ff_audio_default_filterpad),
    FILTER_QUERY_FUNC2(query_formats),
}

Definition at line 236 of file af_channelsplit.c.