FFmpeg
Data Structures | Macros | Functions | Variables
af_channelsplit.c File Reference
#include "libavutil/attributes.h"
#include "libavutil/channel_layout.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "audio.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"

Go to the source code of this file.

Data Structures

struct  ChannelSplitContext
 

Macros

#define OFFSET(x)   offsetof(ChannelSplitContext, 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 int query_formats (AVFilterContext *ctx)
 
static int filter_frame (AVFilterLink *inlink, AVFrame *buf)
 

Variables

static const AVOption channelsplit_options []
 
static const AVFilterPad avfilter_af_channelsplit_inputs []
 
const AVFilter 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)    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

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.

◆ query_formats()

static int query_formats ( AVFilterContext ctx)
static

Definition at line 109 of file af_channelsplit.c.

◆ filter_frame()

static int filter_frame ( AVFilterLink inlink,
AVFrame buf 
)
static

Definition at line 135 of file af_channelsplit.c.

Variable Documentation

◆ channelsplit_options

const AVOption channelsplit_options[]
static
Initial value:
= {
{ "channel_layout", "Input channel layout.", OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, { .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.

◆ avfilter_af_channelsplit_inputs

const AVFilterPad avfilter_af_channelsplit_inputs[]
static
Initial value:
= {
{
.name = "default",
.filter_frame = filter_frame,
},
{ NULL }
}

Definition at line 162 of file af_channelsplit.c.

◆ ff_af_channelsplit

const AVFilter ff_af_channelsplit
Initial value:
= {
.name = "channelsplit",
.description = NULL_IF_CONFIG_SMALL("Split audio into per-channel streams."),
.priv_size = sizeof(ChannelSplitContext),
.priv_class = &channelsplit_class,
.init = init,
}

Definition at line 171 of file af_channelsplit.c.

F
#define F
Definition: af_channelsplit.c:48
inputs
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several inputs
Definition: filter_design.txt:243
A
#define A
Definition: af_channelsplit.c:47
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
OFFSET
#define OFFSET(x)
Definition: af_channelsplit.c:46
outputs
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
ChannelSplitContext
Definition: af_channelsplit.c:36
NULL
#define NULL
Definition: coverity.c:32
avfilter_af_channelsplit_inputs
static const AVFilterPad avfilter_af_channelsplit_inputs[]
Definition: af_channelsplit.c:162
AVFILTER_FLAG_DYNAMIC_OUTPUTS
#define AVFILTER_FLAG_DYNAMIC_OUTPUTS
The number of the filter outputs is not determined just by AVFilter.outputs.
Definition: avfilter.h:112
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
init
static av_cold int init(AVFilterContext *ctx)
Definition: af_channelsplit.c:57
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
Definition: af_channelsplit.c:135
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:229
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: af_channelsplit.c:109