A link between two filters. More...

#include <libavfilter/avfilter.h>

Public Types
enum	{ AVLINK_UNINIT = 0 , AVLINK_STARTINIT , AVLINK_INIT }
	stage of the initialization of the link properties (dimensions, etc) More...

Data Fields
AVFilterContext *	src
	source filter More...

AVFilterPad *	srcpad
	output pad on the source filter More...

AVFilterContext *	dst
	dest filter More...

AVFilterPad *	dstpad
	input pad on the dest filter More...

enum AVMediaType	type
	filter media type More...

int	w
	agreed upon image width More...

int	h
	agreed upon image height More...

AVRational	sample_aspect_ratio
	agreed upon sample aspect ratio More...

int	sample_rate
	samples per second More...

int	format
	agreed upon media format More...

AVRational	time_base
	Define the time base used by the PTS of the frames/samples which will pass through this link. More...

AVChannelLayout	ch_layout
	channel layout of current buffer (see libavutil/channel_layout.h) More...

AVFilterFormatsConfig	incfg
	Lists of supported formats / etc. More...

AVFilterFormatsConfig	outcfg
	Lists of supported formats / etc. More...

enum AVFilterLink:: { ... }	init_state
	stage of the initialization of the link properties (dimensions, etc) More...

struct AVFilterGraph *	graph
	Graph the filter belongs to. More...

int64_t	current_pts
	Current timestamp of the link, as defined by the most recent frame(s), in link time_base units. More...

int64_t	current_pts_us
	Current timestamp of the link, as defined by the most recent frame(s), in AV_TIME_BASE units. More...

int	age_index
	Index in the age array. More...

AVRational	frame_rate
	Frame rate of the stream on the link, or 1/0 if unknown or variable; if left to 0/0, will be automatically copied from the first input of the source filter if it exists. More...

int	min_samples
	Minimum number of samples to filter at once. More...

int	max_samples
	Maximum number of samples to filter at once. More...

int64_t	frame_count_in
	Number of past frames sent through the link. More...

int64_t	frame_count_out

int64_t	sample_count_in
	Number of past samples sent through the link. More...

int64_t	sample_count_out

void *	frame_pool
	A pointer to a FFFramePool struct. More...

int	frame_wanted_out
	True if a frame is currently wanted on the output of this filter. More...

AVBufferRef *	hw_frames_ctx
	For hwaccel pixel formats, this should be a reference to the AVHWFramesContext describing the frames. More...

char	reserved [0xF000]
	Internal structure members. More...

Detailed Description

A link between two filters.

This contains pointers to the source and destination filters between which this link exists, and the indexes of the pads involved. In addition, this link also contains the parameters which have been negotiated and agreed upon between the filter, such as image dimensions, format, etc.

Applications must not normally access the link structure directly. Use the buffersrc and buffersink API instead. In the future, access to the header may be reserved for filters implementation.

Examples: filtering_audio.c.

Definition at line 538 of file avfilter.h.

Member Enumeration Documentation

◆ anonymous enum

anonymous enum

stage of the initialization of the link properties (dimensions, etc)

Enumerator
AVLINK_UNINIT	not started
AVLINK_STARTINIT	started, but incomplete
AVLINK_INIT	complete

Definition at line 594 of file avfilter.h.

Field Documentation

◆ src

AVFilterContext* AVFilterLink::src

source filter

Definition at line 539 of file avfilter.h.

◆ srcpad

AVFilterPad* AVFilterLink::srcpad

output pad on the source filter

Definition at line 540 of file avfilter.h.

◆ dst

AVFilterContext* AVFilterLink::dst

dest filter

Definition at line 542 of file avfilter.h.

◆ dstpad

AVFilterPad* AVFilterLink::dstpad

input pad on the dest filter

Definition at line 543 of file avfilter.h.

◆ type

enum AVMediaType AVFilterLink::type

filter media type

Definition at line 545 of file avfilter.h.

◆ w

int AVFilterLink::w

agreed upon image width

Definition at line 548 of file avfilter.h.

◆ h

int AVFilterLink::h

agreed upon image height

Definition at line 549 of file avfilter.h.

◆ sample_aspect_ratio

AVRational AVFilterLink::sample_aspect_ratio

agreed upon sample aspect ratio

Definition at line 550 of file avfilter.h.

◆ sample_rate

int AVFilterLink::sample_rate

samples per second

Examples: filtering_audio.c.

Definition at line 560 of file avfilter.h.

Referenced by init_filters().

◆ format

int AVFilterLink::format

agreed upon media format

Examples: filtering_audio.c.

Definition at line 562 of file avfilter.h.

Referenced by init_filters().

◆ time_base

AVRational AVFilterLink::time_base

Define the time base used by the PTS of the frames/samples which will pass through this link.

During the configuration stage, each filter is supposed to change only the output timebase, while the timebase of the input link is assumed to be an unchangeable property.

Examples: filtering_video.c.

Definition at line 571 of file avfilter.h.

Referenced by main().

◆ ch_layout

AVChannelLayout AVFilterLink::ch_layout

channel layout of current buffer (see libavutil/channel_layout.h)

Examples: filtering_audio.c.

Definition at line 573 of file avfilter.h.

Referenced by init_filters().

◆ incfg

AVFilterFormatsConfig AVFilterLink::incfg

Lists of supported formats / etc.

supported by the input filter.

Definition at line 586 of file avfilter.h.

◆ outcfg

AVFilterFormatsConfig AVFilterLink::outcfg

Lists of supported formats / etc.

supported by the output filter.

Definition at line 591 of file avfilter.h.

◆

enum { ... } AVFilterLink::init_state

stage of the initialization of the link properties (dimensions, etc)

◆ graph

struct AVFilterGraph* AVFilterLink::graph

Graph the filter belongs to.

Definition at line 603 of file avfilter.h.

◆ current_pts

int64_t AVFilterLink::current_pts

Current timestamp of the link, as defined by the most recent frame(s), in link time_base units.

Definition at line 609 of file avfilter.h.

◆ current_pts_us

int64_t AVFilterLink::current_pts_us

Current timestamp of the link, as defined by the most recent frame(s), in AV_TIME_BASE units.

Definition at line 615 of file avfilter.h.

◆ age_index

int AVFilterLink::age_index

Index in the age array.

Definition at line 620 of file avfilter.h.

◆ frame_rate

AVRational AVFilterLink::frame_rate

Frame rate of the stream on the link, or 1/0 if unknown or variable; if left to 0/0, will be automatically copied from the first input of the source filter if it exists.

Sources should set it to the best estimation of the real frame rate. If the source frame rate is unknown or variable, set this to 1/0. Filters should update it if necessary depending on their function. Sinks can use it to set a default output frame rate. It is similar to the r_frame_rate field in AVStream.

Definition at line 633 of file avfilter.h.

◆ min_samples

int AVFilterLink::min_samples

Minimum number of samples to filter at once.

If filter_frame() is called with fewer samples, it will accumulate them in fifo. This field and the related ones must not be changed after filtering has started. If 0, all related fields are ignored.

Definition at line 642 of file avfilter.h.

◆ max_samples

int AVFilterLink::max_samples

Maximum number of samples to filter at once.

If filter_frame() is called with more samples, it will split them.

Definition at line 648 of file avfilter.h.

◆ frame_count_in

int64_t AVFilterLink::frame_count_in

Number of past frames sent through the link.

Definition at line 653 of file avfilter.h.

◆ frame_count_out

int64_t AVFilterLink::frame_count_out

Definition at line 653 of file avfilter.h.

◆ sample_count_in

int64_t AVFilterLink::sample_count_in

Number of past samples sent through the link.

Definition at line 658 of file avfilter.h.

◆ sample_count_out

int64_t AVFilterLink::sample_count_out

Definition at line 658 of file avfilter.h.

◆ frame_pool

void* AVFilterLink::frame_pool

A pointer to a FFFramePool struct.

Definition at line 663 of file avfilter.h.

◆ frame_wanted_out

int AVFilterLink::frame_wanted_out

True if a frame is currently wanted on the output of this filter.

Set when ff_request_frame() is called by the output, cleared when a frame is filtered.

Definition at line 670 of file avfilter.h.

◆ hw_frames_ctx

AVBufferRef* AVFilterLink::hw_frames_ctx

For hwaccel pixel formats, this should be a reference to the AVHWFramesContext describing the frames.

Definition at line 676 of file avfilter.h.

◆ reserved

char AVFilterLink::reserved[0xF000]

Internal structure members.

The fields below this limit are internal for libavfilter's use and must in no way be accessed by applications.

Definition at line 685 of file avfilter.h.

The documentation for this struct was generated from the following file:

libavfilter/avfilter.h

Public Types

Data Fields

Detailed Description

Member Enumeration Documentation

◆ anonymous enum

Field Documentation

◆ src

◆ srcpad

◆ dst

◆ dstpad

◆ type

◆ w

◆ h

◆ sample_aspect_ratio

◆ sample_rate

◆ format

◆ time_base

◆ ch_layout

◆ incfg

◆ outcfg

◆

◆ graph

◆ current_pts

◆ current_pts_us

◆ age_index

◆ frame_rate

◆ min_samples

◆ max_samples

◆ frame_count_in

◆ frame_count_out

◆ sample_count_in

◆ sample_count_out

◆ frame_pool

◆ frame_wanted_out

◆ hw_frames_ctx

◆ reserved