Files
file	avfilter.h
	external API header

Data Structures
struct	AVFilterBuffer
	A reference-counted buffer data type used by the filter system. More...

struct	AVFilterBufferRefAudioProps
	Audio specific properties in a reference to an AVFilterBuffer. More...

struct	AVFilterBufferRefVideoProps
	Video specific properties in a reference to an AVFilterBuffer. More...

struct	AVFilterBufferRef
	A reference to an AVFilterBuffer. More...

struct	AVFilter
	Filter definition. More...

struct	AVFilterContext
	An instance of a filter. More...

struct	AVFilterLink
	A link between two filters. More...

Macros
#define	AV_PERM_READ 0x01
	can read from the buffer

#define	AV_PERM_WRITE 0x02
	can write to the buffer

#define	AV_PERM_PRESERVE 0x04
	nobody else can overwrite the buffer

#define	AV_PERM_REUSE 0x08
	can output the buffer multiple times, with the same contents each time

#define	AV_PERM_REUSE2 0x10
	can output the buffer multiple times, modified each time

#define	AV_PERM_NEG_LINESIZES 0x20
	the buffer requested can have negative linesizes

#define	AV_PERM_ALIGN 0x40
	the buffer must be aligned

#define	AVFILTER_ALIGN 16

#define	AVFILTER_CMD_FLAG_ONE 1
	Stop once a filter understood the command (for target=all for example), fast filters are favored automatically.

#define	AVFILTER_CMD_FLAG_FAST 2
	Only execute command when its fast (like a video out that supports contrast adjustment in hw)

Functions
unsigned	avfilter_version (void)
	Return the LIBAVFILTER_VERSION_INT constant.

const char *	avfilter_configuration (void)
	Return the libavfilter build-time configuration.

const char *	avfilter_license (void)
	Return the libavfilter license.

const AVClass *	avfilter_get_class (void)
	Get the class for the AVFilterContext struct.

void	avfilter_copy_buffer_ref_props (AVFilterBufferRef dst, AVFilterBufferRef src)
	Copy properties of src to dst, without copying the actual data.

AVFilterBufferRef *	avfilter_ref_buffer (AVFilterBufferRef *ref, int pmask)
	Add a new reference to a buffer.

void	avfilter_unref_buffer (AVFilterBufferRef *ref)
	Remove a reference to a buffer.

void	avfilter_unref_bufferp (AVFilterBufferRef **ref)
	Remove a reference to a buffer and set the pointer to NULL.

int	avfilter_ref_get_channels (AVFilterBufferRef *ref)
	Get the number of channels of a buffer reference.

const char *	avfilter_pad_get_name (AVFilterPad *pads, int pad_idx)
	Get the name of an AVFilterPad.

enum AVMediaType	avfilter_pad_get_type (AVFilterPad *pads, int pad_idx)
	Get the type of an AVFilterPad.

int	avfilter_link (AVFilterContext src, unsigned srcpad, AVFilterContext dst, unsigned dstpad)
	Link two filters together.

void	avfilter_link_free (AVFilterLink **link)
	Free the link in *link, and set its pointer to NULL.

int	avfilter_link_get_channels (AVFilterLink *link)
	Get the number of channels of a link.

void	avfilter_link_set_closed (AVFilterLink *link, int closed)
	Set the closed field of a link.

int	avfilter_config_links (AVFilterContext *filter)
	Negotiate the media format, dimensions, etc of all inputs to a filter.

AVFilterBufferRef *	avfilter_get_video_buffer_ref_from_arrays (uint8_t *const data[4], const int linesize[4], int perms, int w, int h, enum AVPixelFormat format)
	Create a buffer reference wrapped around an already allocated image buffer.

AVFilterBufferRef *	avfilter_get_audio_buffer_ref_from_arrays (uint8_t **data, int linesize, int perms, int nb_samples, enum AVSampleFormat sample_fmt, uint64_t channel_layout)
	Create an audio buffer reference wrapped around an already allocated samples buffer.

AVFilterBufferRef *	avfilter_get_audio_buffer_ref_from_arrays_channels (uint8_t **data, int linesize, int perms, int nb_samples, enum AVSampleFormat sample_fmt, int channels, uint64_t channel_layout)
	Create an audio buffer reference wrapped around an already allocated samples buffer.

int	avfilter_process_command (AVFilterContext filter, const char cmd, const char arg, char res, int res_len, int flags)
	Make the filter instance process a command.

void	avfilter_register_all (void)
	Initialize the filter system.

void	avfilter_uninit (void)
	Uninitialize the filter system.

int	avfilter_register (AVFilter *filter)
	Register a filter.

AVFilter *	avfilter_get_by_name (const char *name)
	Get a filter definition matching the given name.

AVFilter **	av_filter_next (AVFilter **filter)
	If filter is NULL, returns a pointer to the first registered filter pointer, if filter is non-NULL, returns the next pointer after filter.

int	avfilter_open (AVFilterContext *filter_ctx, AVFilter filter, const char *inst_name)
	Create a filter instance.

int	avfilter_init_filter (AVFilterContext filter, const char args, void *opaque)
	Initialize a filter.

void	avfilter_free (AVFilterContext *filter)
	Free a filter context.

int	avfilter_insert_filter (AVFilterLink link, AVFilterContext filt, unsigned filt_srcpad_idx, unsigned filt_dstpad_idx)
	Insert a filter in the middle of an existing link.

Detailed Description

Macro Definition Documentation

#define AV_PERM_READ 0x01

can read from the buffer

Definition at line 112 of file avfilter.h.

Referenced by avfilter_get_audio_buffer_ref_from_arrays_channels(), avfilter_get_video_buffer_ref_from_arrays(), decode_video(), ff_default_get_audio_buffer(), ff_default_get_video_buffer(), ff_get_ref_perms_string(), ff_vf_next_put_image(), filter_frame(), init(), return_audio_frame(), sub2video_prepare(), and video_thread().

#define AV_PERM_WRITE 0x02

#define AV_PERM_PRESERVE 0x04

nobody else can overwrite the buffer

Definition at line 114 of file avfilter.h.

Referenced by config_output(), config_video_output(), decode_video(), ff_default_get_audio_buffer(), ff_default_get_video_buffer(), ff_get_ref_perms_string(), frame_to_buf(), init(), request_frame(), sub2video_prepare(), and video_thread().

#define AV_PERM_REUSE 0x08

can output the buffer multiple times, with the same contents each time

Definition at line 115 of file avfilter.h.

Referenced by ff_default_get_audio_buffer(), ff_default_get_video_buffer(), ff_get_ref_perms_string(), and request_frame().

#define AV_PERM_REUSE2 0x10

can output the buffer multiple times, modified each time

Definition at line 116 of file avfilter.h.

Referenced by config_output(), config_video_output(), ff_default_get_audio_buffer(), ff_default_get_video_buffer(), ff_get_ref_perms_string(), ff_vf_next_put_image(), and frame_to_buf().

#define AV_PERM_NEG_LINESIZES 0x20

the buffer requested can have negative linesizes

Definition at line 117 of file avfilter.h.

Referenced by ff_default_get_audio_buffer(), ff_default_get_video_buffer(), ff_filter_frame_framed(), ff_get_ref_perms_string(), filter_frame(), and get_video_buffer().

#define AV_PERM_ALIGN 0x40

the buffer must be aligned

Definition at line 118 of file avfilter.h.

Referenced by ff_default_get_audio_buffer(), ff_default_get_video_buffer(), filter_frame(), and get_video_buffer().

#define AVFILTER_ALIGN 16

Definition at line 120 of file avfilter.h.

Referenced by get_video_buffer().

#define AVFILTER_CMD_FLAG_ONE 1

Stop once a filter understood the command (for target=all for example), fast filters are favored automatically.

Definition at line 762 of file avfilter.h.

Referenced by avfilter_graph_queue_command(), avfilter_graph_send_command(), check_keyboard_interaction(), and filter_frame().

#define AVFILTER_CMD_FLAG_FAST 2

Only execute command when its fast (like a video out that supports contrast adjustment in hw)

Definition at line 763 of file avfilter.h.

Referenced by avfilter_graph_send_command().

Function Documentation

unsigned avfilter_version ( void )

Return the LIBAVFILTER_VERSION_INT constant.

Definition at line 79 of file avfilter.c.

const char* avfilter_configuration ( void )

Return the libavfilter build-time configuration.

Definition at line 84 of file avfilter.c.

const char* avfilter_license ( void )

Return the libavfilter license.

Definition at line 89 of file avfilter.c.

const AVClass* avfilter_get_class ( void )

Get the class for the AVFilterContext struct.

Definition at line 498 of file avfilter.c.

Referenced by show_help_default().

void avfilter_copy_buffer_ref_props	(	AVFilterBufferRef *	dst,
		AVFilterBufferRef *	src
	)

Copy properties of src to dst, without copying the actual data.

Definition at line 189 of file buffer.c.

Referenced by ff_copy_buffer_ref(), ff_filter_frame_framed(), ff_filter_frame_needs_framing(), filter_frame(), geq_filter_frame(), pp_filter_frame(), and return_frame().

AVFilterBufferRef* avfilter_ref_buffer	(	AVFilterBufferRef *	ref,
		int	pmask
	)

Add a new reference to a buffer.

Parameters

ref	an existing reference to the buffer
pmask	a bitmask containing the allowable permissions in the new reference

Returns: a new reference to the buffer with the same properties as the old, excluding any permissions denied by pmask

Definition at line 51 of file buffer.c.

Referenced by filter_frame(), push_frame(), request_frame(), return_audio_frame(), and sub2video_push_ref().

void avfilter_unref_buffer ( AVFilterBufferRef * ref )

Remove a reference to a buffer.

If this is the last reference to the buffer, the buffer itself is also automatically freed.

Parameters

ref	reference to the buffer, may be NULL

Note: it is recommended to use avfilter_unref_bufferp() instead of this function

Definition at line 161 of file buffer.c.

Referenced by add_to_queue(), av_buffersink_read_samples(), av_buffersrc_add_frame(), av_buffersrc_add_ref(), avfilter_unref_bufferp(), channelmap_filter_frame(), common_uninit(), ff_buffersink_read_samples_compat(), ff_bufqueue_add(), ff_bufqueue_discard_all(), ff_filter_frame_framed(), ff_filter_frame_needs_framing(), filter_frame(), flush_fifo(), frame_to_buf(), join_request_frame(), lavfi_read_packet(), output_frame(), pp_filter_frame(), process_frame(), reap_filters(), request_frame(), return_audio_frame(), try_filter_frame(), uninit(), and write_to_fifo().

void avfilter_unref_bufferp ( AVFilterBufferRef ** ref )

Remove a reference to a buffer and set the pointer to NULL.

If this is the last reference to the buffer, the buffer itself is also automatically freed.

Parameters

ref	pointer to the buffer reference

Examples:: doc/examples/filtering_audio.c, and doc/examples/filtering_video.c.

Definition at line 183 of file buffer.c.

Referenced by alloc_picture(), avfilter_get_audio_buffer_ref_from_frame(), avfilter_get_video_buffer_ref_from_frame(), avfilter_link_free(), config_output(), config_video_output(), exit_program(), filter_frame(), geq_filter_frame(), join_free_buffer(), join_uninit(), main(), null_filter_frame(), queue_picture(), request_frame(), stream_close(), uninit(), write_to_fifo(), and yae_clear().

int avfilter_ref_get_channels ( AVFilterBufferRef * ref )

Get the number of channels of a buffer reference.

Definition at line 30 of file audio.c.

const char* avfilter_pad_get_name	(	AVFilterPad *	pads,
		int	pad_idx
	)

Get the name of an AVFilterPad.

Parameters

pads	an array of AVFilterPads
pad_idx	index of the pad in the array it; is the caller's responsibility to ensure the index is valid

Returns: name of the pad_idx'th pad in pads

Definition at line 626 of file avfilter.c.

enum AVMediaType avfilter_pad_get_type	(	AVFilterPad *	pads,
		int	pad_idx
	)

Get the type of an AVFilterPad.

Parameters

pads	an array of AVFilterPads
pad_idx	index of the pad in the array; it is the caller's responsibility to ensure the index is valid

Returns: type of the pad_idx'th pad in pads

Definition at line 631 of file avfilter.c.

Referenced by configure_input_filter(), configure_output_filter(), init_input_filter(), init_output_filter(), and open_output_file().

int avfilter_link	(	AVFilterContext *	src,
		unsigned	srcpad,
		AVFilterContext *	dst,
		unsigned	dstpad
	)

Link two filters together.

Parameters

src	the source filter
srcpad	index of the output pad on the source filter
dst	the destination filter
dstpad	index of the input pad on the destination filter

Returns: zero on success

Definition at line 125 of file avfilter.c.

Referenced by avfilter_graph_parse(), avfilter_insert_filter(), configure_input_audio_filter(), configure_input_video_filter(), configure_output_audio_filter(), configure_output_video_filter(), lavfi_read_header(), and link_filter().

void avfilter_link_free ( AVFilterLink ** link )

Free the link in *link, and set its pointer to NULL.

Definition at line 156 of file avfilter.c.

Referenced by avfilter_free().

int avfilter_link_get_channels ( AVFilterLink * link )

Get the number of channels of a link.

Definition at line 169 of file avfilter.c.

Referenced by transcode_init().

void avfilter_link_set_closed	(	AVFilterLink *	link,
		int	closed
	)

Set the closed field of a link.

Definition at line 174 of file avfilter.c.

int avfilter_config_links ( AVFilterContext * filter )

Negotiate the media format, dimensions, etc of all inputs to a filter.

Parameters

filter the filter to negotiate the properties for its inputs

Returns: zero on successful negotiation

Definition at line 217 of file avfilter.c.

Referenced by avfilter_config_links(), and graph_config_links().

AVFilterBufferRef* avfilter_get_video_buffer_ref_from_arrays	(	uint8_t *const	data[4],
		const int	linesize[4],
		int	perms,
		int	w,
		int	h,
		enum AVPixelFormat	format
	)

Create a buffer reference wrapped around an already allocated image buffer.

Parameters

data	pointers to the planes of the image to reference
linesize	linesizes for the planes of the image to reference
perms	the required access permissions
w	the width of the image specified by the data and linesize arrays
h	the height of the image specified by the data and linesize arrays
format	the pixel format of the image specified by the data and linesize arrays

Definition at line 96 of file video.c.

Referenced by avfilter_get_video_buffer_ref_from_frame(), decode_video(), ff_default_get_video_buffer(), sub2video_prepare(), and video_thread().

AVFilterBufferRef* avfilter_get_audio_buffer_ref_from_arrays	(	uint8_t **	data,
		int	linesize,
		int	perms,
		int	nb_samples,
		enum AVSampleFormat	sample_fmt,
		uint64_t	channel_layout
	)

Create an audio buffer reference wrapped around an already allocated samples buffer.

See avfilter_get_audio_buffer_ref_from_arrays_channels() for a version that can handle unknown channel layouts.

Parameters

data	pointers to the samples plane buffers
linesize	linesize for the samples plane buffers
perms	the required access permissions
nb_samples	number of samples per channel
sample_fmt	the format of each sample in the buffer to allocate
channel_layout	the channel layout of the buffer

Definition at line 171 of file audio.c.

Referenced by av_asrc_buffer_add_samples(), and join_request_frame().

AVFilterBufferRef* avfilter_get_audio_buffer_ref_from_arrays_channels	(	uint8_t **	data,
		int	linesize,
		int	perms,
		int	nb_samples,
		enum AVSampleFormat	sample_fmt,
		int	channels,
		uint64_t	channel_layout
	)

Create an audio buffer reference wrapped around an already allocated samples buffer.

Parameters

data	pointers to the samples plane buffers
linesize	linesize for the samples plane buffers
perms	the required access permissions
nb_samples	number of samples per channel
sample_fmt	the format of each sample in the buffer to allocate
channels	the number of channels of the buffer
channel_layout	the channel layout of the buffer, must be either 0 or consistent with channels

Definition at line 95 of file audio.c.

Referenced by avfilter_get_audio_buffer_ref_from_arrays(), avfilter_get_audio_buffer_ref_from_frame(), and ff_default_get_audio_buffer().

int avfilter_process_command	(	AVFilterContext *	filter,
		const char *	cmd,
		const char *	arg,
		char *	res,
		int	res_len,
		int	flags
	)

Make the filter instance process a command.

It is recommended to use avfilter_graph_send_command().

Definition at line 383 of file avfilter.c.

Referenced by avfilter_graph_send_command(), and ff_filter_frame_framed().

void avfilter_register_all ( void )

Initialize the filter system.

Register all builtin filters.

Definition at line 39 of file allfilters.c.

Referenced by lavfi_read_header(), and main().

void avfilter_uninit ( void )

Uninitialize the filter system.

Unregister all filters.

Definition at line 438 of file avfilter.c.

Referenced by do_exit(), and exit_program().

int avfilter_register ( AVFilter * filter )

Register a filter.

This is only needed if you plan to use avfilter_get_by_name later to lookup the AVFilter structure by name. A filter can still by instantiated with avfilter_open even if it is not registered.

Parameters

filter the filter to register

Returns: 0 if the registration was successful, a negative value otherwise

Definition at line 411 of file avfilter.c.

AVFilter* avfilter_get_by_name ( const char * name )

Get a filter definition matching the given name.

Parameters

name	the filter name to find

Returns: the filter definition, if any matching one is registered. NULL if none found.

Definition at line 400 of file avfilter.c.

Referenced by configure_input_audio_filter(), configure_input_video_filter(), configure_output_audio_filter(), configure_output_video_filter(), create_filter(), graph_insert_fifos(), init_filters(), lavfi_read_header(), main(), and query_formats().

AVFilter** av_filter_next ( AVFilter ** filter )

If filter is NULL, returns a pointer to the first registered filter pointer, if filter is non-NULL, returns the next pointer after filter.

If the returned pointer points to NULL, the last registered filter was already reached.

Definition at line 433 of file avfilter.c.

Referenced by filter_child_class_next(), and show_filters().

int avfilter_open	(	AVFilterContext **	filter_ctx,
		AVFilter *	filter,
		const char *	inst_name
	)

Create a filter instance.

Parameters

filter_ctx	put here a pointer to the created filter context on success, NULL on failure
filter	the filter to create an instance of
inst_name	Name to give to the new instance. Can be NULL for none.

Returns: >= 0 in case of success, a negative error code otherwise

Definition at line 503 of file avfilter.c.

Referenced by avfilter_graph_create_filter(), create_filter(), and main().

int avfilter_init_filter	(	AVFilterContext *	filter,
		const char *	args,
		void *	opaque
	)

Initialize a filter.

Parameters

filter	the filter to initialize
args	A string of parameters to use when initializing the filter. The format and meaning of this string varies by filter.
opaque	Any extra non-string data needed by the filter. The meaning of this parameter varies by filter.

Returns: zero on success

Definition at line 615 of file avfilter.c.

Referenced by avfilter_graph_create_filter(), create_filter(), and main().

void avfilter_free ( AVFilterContext * filter )

Free a filter context.

Parameters

filter the filter to free

Definition at line 565 of file avfilter.c.

Referenced by avfilter_graph_create_filter(), avfilter_graph_free(), avfilter_graph_parse(), avfilter_graph_parse2(), create_filter(), and main().

int avfilter_insert_filter	(	AVFilterLink *	link,
		AVFilterContext *	filt,
		unsigned	filt_srcpad_idx,
		unsigned	filt_dstpad_idx
	)

Insert a filter in the middle of an existing link.

Parameters

link	the link into which the filter should be inserted
filt	the filter to be inserted
filt_srcpad_idx	the input pad on the filter to connect
filt_dstpad_idx	the output pad on the filter to connect

Returns: zero on success

Definition at line 179 of file avfilter.c.

Referenced by graph_insert_fifos(), and query_formats().

Files

Data Structures

Macros

Functions

Detailed Description

Macro Definition Documentation

Function Documentation