#include "libavutil/atomic.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/buffer.h"
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/eval.h"
#include "libavutil/hwcontext.h"
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/rational.h"
#include "libavutil/samplefmt.h"
#include "framequeue.h"
#include "audio.h"
#include "avfilter.h"
#include "filters.h"
#include "formats.h"
#include "internal.h"
#include "libavutil/ffversion.h"

Macros
#define	FF_INTERNAL_FIELDS 1

#define	LICENSE_PREFIX "libavfilter license: "

#define	OFFSET(x) offsetof(AVFilterContext, x)

#define	FLAGS AV_OPT_FLAG_FILTERING_PARAM

#define	FFERROR_NOT_READY FFERRTAG('N','R','D','Y')

Enumerations
enum	{ VAR_T, VAR_N, VAR_POS, VAR_W, VAR_H, VAR_VARS_NB }

Functions
void	ff_tlog_ref (void ctx, AVFrame ref, int end)

unsigned	avfilter_version (void)
	Return the LIBAVFILTER_VERSION_INT constant. More...

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

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

void	ff_command_queue_pop (AVFilterContext *filter)

int	ff_insert_pad (unsigned idx, unsigned count, size_t padidx_off, AVFilterPad pads, AVFilterLink *links, AVFilterPad newpad)
	Insert a new pad. More...

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

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

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

void	ff_filter_set_ready (AVFilterContext *filter, unsigned priority)
	Filters implementation helper functions. More...

static void	filter_unblock (AVFilterContext *filter)
	Clear frame_blocked_in on all outputs. More...

void	ff_avfilter_link_set_in_status (AVFilterLink *link, int status, int64_t pts)
	Set the status field of a link from the source filter. More...

void	ff_avfilter_link_set_out_status (AVFilterLink *link, int status, int64_t pts)
	Set the status field of a link from the destination filter. More...

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

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. More...

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

void	ff_tlog_link (void ctx, AVFilterLink link, int end)

int	ff_request_frame (AVFilterLink *link)
	Request an input frame from the filter at the other end of the link. More...

static int	ff_request_frame_to_filter (AVFilterLink *link)

int	ff_poll_frame (AVFilterLink *link)
	Poll a frame from the filter chain. More...

static int	set_enable_expr (AVFilterContext ctx, const char expr)

void	ff_update_link_current_pts (AVFilterLink *link, int64_t pts)

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. More...

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

int	avfilter_register (AVFilter *filter)
	Register a filter. More...

const AVFilter *	avfilter_next (const AVFilter *prev)
	Iterate over all registered filters. More...

int	avfilter_pad_count (const AVFilterPad *pads)
	Get the number of elements in a NULL-terminated array of AVFilterPads (e.g. More...

static const char *	default_filter_name (void *filter_ctx)

static void *	filter_child_next (void obj, void prev)

static const AVClass *	filter_child_class_next (const AVClass *prev)

static int	default_execute (AVFilterContext ctx, avfilter_action_func func, void arg, int ret, int nb_jobs)

AVFilterContext *	ff_filter_alloc (const AVFilter filter, const char inst_name)
	Allocate a new filter context and return it. More...

static void	free_link (AVFilterLink *link)

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

int	ff_filter_get_nb_threads (AVFilterContext *ctx)
	Get number of threads for current filter instance. More...

static int	process_options (AVFilterContext ctx, AVDictionary options, const char args)

int	avfilter_init_dict (AVFilterContext ctx, AVDictionary *options)
	Initialize a filter with the supplied dictionary of options. More...

int	avfilter_init_str (AVFilterContext filter, const char args)
	Initialize a filter with the supplied parameters. More...

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

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

static int	default_filter_frame (AVFilterLink link, AVFrame frame)

static int	ff_filter_frame_framed (AVFilterLink link, AVFrame frame)

int	ff_filter_frame (AVFilterLink link, AVFrame frame)
	Send a frame of data to the next filter. More...

static int	samples_ready (AVFilterLink *link, unsigned min)

static int	take_samples (AVFilterLink link, unsigned min, unsigned max, AVFrame *rframe)

static int	ff_filter_frame_to_filter (AVFilterLink *link)

static int	forward_status_change (AVFilterContext filter, AVFilterLink in)

static int	ff_filter_activate_default (AVFilterContext *filter)

int	ff_filter_activate (AVFilterContext *filter)

int	ff_inlink_acknowledge_status (AVFilterLink link, int rstatus, int64_t *rpts)
	Test and acknowledge the change of status on the link. More...

int	ff_inlink_check_available_frame (AVFilterLink *link)
	Test if a frame is available on the link. More...

int	ff_inlink_check_available_samples (AVFilterLink *link, unsigned min)
	Test if enough samples are available on the link. More...

static void	consume_update (AVFilterLink link, const AVFrame frame)

int	ff_inlink_consume_frame (AVFilterLink link, AVFrame *rframe)
	Take a frame from the link's FIFO and update the link's stats. More...

int	ff_inlink_consume_samples (AVFilterLink link, unsigned min, unsigned max, AVFrame *rframe)
	Take samples from the link's FIFO and update the link's stats. More...

int	ff_inlink_make_frame_writable (AVFilterLink link, AVFrame *rframe)
	Make sure a frame is writable. More...

int	ff_inlink_process_commands (AVFilterLink link, const AVFrame frame)
	Process the commands queued in the link up to the time of the frame. More...

int	ff_inlink_evaluate_timeline_at_frame (AVFilterLink link, const AVFrame frame)
	Evaluate the timeline expression of the link for the time and properties of the frame. More...

void	ff_inlink_request_frame (AVFilterLink *link)
	Mark that a frame is wanted on the link. More...

const AVClass *	avfilter_get_class (void)

Variables
const char	av_filter_ffversion [] = "FFmpeg version " FFMPEG_VERSION

static const char *const	var_names []

static AVFilter *	first_filter

static AVFilter **	last_filter = &first_filter

static const AVOption	avfilter_options []

static const AVClass	avfilter_class

Macro Definition Documentation

#define FF_INTERNAL_FIELDS 1

Definition at line 37 of file avfilter.c.

#define LICENSE_PREFIX "libavfilter license: "

Referenced by avfilter_license().

#define OFFSET ( x ) offsetof(AVFilterContext, x)

Definition at line 657 of file avfilter.c.

#define FLAGS AV_OPT_FLAG_FILTERING_PARAM

Definition at line 658 of file avfilter.c.

#define FFERROR_NOT_READY FFERRTAG('N','R','D','Y')

Definition at line 1307 of file avfilter.c.

Referenced by ff_filter_activate(), and ff_filter_activate_default().

Enumeration Type Documentation

anonymous enum

Enumerator
VAR_T
VAR_N
VAR_POS
VAR_W
VAR_H
VAR_VARS_NB

Definition at line 477 of file avfilter.c.

Function Documentation

void ff_tlog_ref	(	void *	ctx,
		AVFrame *	ref,
		int	end
	)

Definition at line 49 of file avfilter.c.

Referenced by ff_filter_frame().

void ff_command_queue_pop ( AVFilterContext * filter )

Definition at line 94 of file avfilter.c.

Referenced by avfilter_free(), and ff_inlink_process_commands().

int ff_insert_pad	(	unsigned	idx,
		unsigned *	count,
		size_t	padidx_off,
		AVFilterPad **	pads,
		AVFilterLink ***	links,
		AVFilterPad *	newpad
	)

Insert a new pad.

Parameters

idx	Insertion point. Pad is inserted at the end if this point is beyond the end of the list of pads.
count	Pointer to the number of pads in the list
padidx_off	Offset within an AVFilterLink structure to the element to increment when inserting a new pad causes link numbering to change
pads	Pointer to the pointer to the beginning of the list of pads
links	Pointer to the pointer to the beginning of the list of links
newpad	The new pad to add. A copy is made when adding.

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

Definition at line 103 of file avfilter.c.

Referenced by ff_insert_inpad(), and ff_insert_outpad().

void ff_filter_set_ready	(	AVFilterContext *	filter,
		unsigned	priority
	)

Filters implementation helper functions.

Mark a filter ready and schedule it for activation.

This is automatically done when something happens to the filter (queued frame, status change, request on output). Filters implementing the activate callback can call it directly to perform one more round of processing later. It is also useful for filters reacting to external or asynchronous events.

Definition at line 191 of file avfilter.c.

Referenced by ff_avfilter_link_set_in_status(), ff_avfilter_link_set_out_status(), ff_filter_frame(), ff_filter_frame_to_filter(), ff_inlink_request_frame(), ff_request_frame(), and forward_status_change().

static void filter_unblock ( AVFilterContext * filter )

static

Clear frame_blocked_in on all outputs.

This is necessary whenever something changes on input.

Definition at line 200 of file avfilter.c.

Referenced by ff_avfilter_link_set_in_status(), ff_avfilter_link_set_out_status(), ff_filter_frame(), and ff_filter_frame_to_filter().

void ff_avfilter_link_set_in_status	(	AVFilterLink *	link,
		int	status,
		int64_t	pts
	)

Set the status field of a link from the source filter.

The pts should reflect the timestamp of the status change, in link time base and relative to the frames timeline. In particular, for AVERROR_EOF, it should reflect the end time of the last frame.

Definition at line 209 of file avfilter.c.

Referenced by av_buffersrc_add_frame_internal(), and ff_request_frame_to_filter().

void ff_avfilter_link_set_out_status	(	AVFilterLink *	link,
		int	status,
		int64_t	pts
	)

Set the status field of a link from the destination filter.

The pts should probably be left unset (AV_NOPTS_VALUE).

Definition at line 222 of file avfilter.c.

Referenced by avfilter_link_set_closed(), ff_filter_frame_to_filter(), ff_request_frame(), and forward_status_change().

void ff_tlog_link	(	void *	ctx,
		AVFilterLink *	link,
		int	end
	)

Definition at line 381 of file avfilter.c.

Referenced by ff_filter_frame(), ff_get_video_buffer(), ff_request_frame(), and ff_request_frame_to_filter().

int ff_request_frame ( AVFilterLink * link )

Request an input frame from the filter at the other end of the link.

This function must not be used by filters using the activate callback, use ff_link_set_frame_wanted() instead.

The input filter may pass the request on to its inputs, fulfill the request from an internal buffer or any other means specific to its function.

When the end of a stream is reached AVERROR_EOF is returned and no further frames are returned after that.

When a filter is unable to output a frame for example due to its sources being unable to do so or because it depends on external means pushing data into it then AVERROR(EAGAIN) is returned. It is important that a AVERROR(EAGAIN) return is returned all the way to the caller (generally eventually a user application) as this step may (but does not have to be) necessary to provide the input with the next frame.

If a request is successful then some progress has been made towards providing a frame on the link (through ff_filter_frame()). A filter that needs several frames to produce one is allowed to return success if one more frame has been processed but no output has been produced yet. A filter is also allowed to simply forward a success return value.

Parameters

link	the input link

Returns: zero on success AVERROR_EOF on end of file AVERROR(EAGAIN) if the previous filter cannot output a frame currently and can neither guarantee that EOF has been reached.

Definition at line 405 of file avfilter.c.

Referenced by avfilter_graph_request_oldest(), ff_framesync_request_frame(), ff_request_frame_to_filter(), join_request_frame(), qsvdeint_request_frame(), request_frame(), request_frame_ref(), request_inlink(), request_samples(), and return_audio_frame().

static int ff_request_frame_to_filter ( AVFilterLink * link )

static

Definition at line 430 of file avfilter.c.

Referenced by ff_filter_activate_default(), and forward_status_change().

int ff_poll_frame ( AVFilterLink * link )

Poll a frame from the filter chain.

Parameters

link	the input link

Returns: the number of immediately available frames, a negative number in case of error

Definition at line 450 of file avfilter.c.

Referenced by ff_poll_frame().

static int set_enable_expr	(	AVFilterContext *	ctx,
		const char *	expr
	)

static

Definition at line 486 of file avfilter.c.

Referenced by avfilter_process_command(), and process_options().

void ff_update_link_current_pts	(	AVFilterLink *	link,
		int64_t	pts
	)

Definition at line 526 of file avfilter.c.

Referenced by consume_update(), ff_avfilter_link_set_out_status(), and ff_inlink_acknowledge_status().

static const char* default_filter_name ( void * filter_ctx )

static

Definition at line 622 of file avfilter.c.

static void* filter_child_next	(	void *	obj,
		void *	prev
	)

static

Definition at line 628 of file avfilter.c.

static const AVClass* filter_child_class_next ( const AVClass * prev )

static

Definition at line 636 of file avfilter.c.

static int default_execute	(	AVFilterContext *	ctx,
		avfilter_action_func *	func,
		void *	arg,
		int *	ret,
		int	nb_jobs
	)

static

Definition at line 679 of file avfilter.c.

Referenced by ff_filter_alloc().

AVFilterContext* ff_filter_alloc	(	const AVFilter *	filter,
		const char *	inst_name
	)

Allocate a new filter context and return it.

Parameters

filter	what filter to create an instance of
inst_name	name to give to the new filter context

Returns: newly created filter context or NULL on failure

Definition at line 692 of file avfilter.c.

Referenced by avfilter_graph_alloc_filter().

static void free_link ( AVFilterLink * link )

static

Definition at line 768 of file avfilter.c.

Referenced by avfilter_free().

int ff_filter_get_nb_threads ( AVFilterContext * ctx )

Get number of threads for current filter instance.

This number is always same or less than graph->nb_threads.

Definition at line 831 of file avfilter.c.

Referenced by apply_lut(), averageiir2d(), blend_frame(), config_input(), config_props(), filter(), filter_frame(), filter_frame16(), filter_frame8(), gaussianiir2d(), and nlmeans_plane().

static int process_options	(	AVFilterContext *	ctx,
		AVDictionary **	options,
		const char *	args
	)

static

Definition at line 838 of file avfilter.c.

Referenced by avfilter_init_str().

static int default_filter_frame	(	AVFilterLink *	link,
		AVFrame *	frame
	)

static

Definition at line 1089 of file avfilter.c.

Referenced by ff_filter_frame_framed().

static int ff_filter_frame_framed	(	AVFilterLink *	link,
		AVFrame *	frame
	)

static

Definition at line 1094 of file avfilter.c.

Referenced by ff_filter_frame_to_filter().

int ff_filter_frame	(	AVFilterLink *	link,
		AVFrame *	frame
	)

Send a frame of data to the next filter.

Parameters

link	the output link over which the data is being sent
frame	a reference to the buffer of data being sent. The receiving filter will free this reference when it no longer needs it or pass it on to the next filter.

Returns: >= 0 on success, a negative AVERROR on error. The receiving filter is responsible for unreferencing frame in case of error.

Definition at line 1125 of file avfilter.c.

Referenced by apply_filter(), channelmap_filter_frame(), compand_delay(), compand_nodelay(), cudaupload_filter_frame(), default_filter_frame(), deint_vaapi_filter_frame(), end_last_frame(), filter(), filter_frame(), filter_frame16(), filter_frame8(), filter_frame_ref(), flush(), geq_filter_frame(), hwdownload_filter_frame(), hwmap_filter_frame(), hwupload_filter_frame(), movie_push_frame(), nppscale_filter_frame(), output_frame(), output_single_frame(), plot_freqs(), plot_spectrum_column(), pp_filter_frame(), process_frame(), push_frame(), push_samples(), qsvscale_filter_frame(), request_frame(), return_audio_frame(), return_frame(), scale_vaapi_filter_frame(), send_silence(), shuffleplanes_filter_frame(), and try_push_frame().

static int samples_ready	(	AVFilterLink *	link,
		unsigned	min
	)

static

Definition at line 1176 of file avfilter.c.

Referenced by ff_filter_activate_default(), and take_samples().

static int take_samples	(	AVFilterLink *	link,
		unsigned	min,
		unsigned	max,
		AVFrame **	rframe
	)

static

Definition at line 1183 of file avfilter.c.

Referenced by ff_inlink_consume_samples().

static int ff_filter_frame_to_filter ( AVFilterLink * link )

static

Definition at line 1243 of file avfilter.c.

Referenced by ff_filter_activate_default().

static int forward_status_change	(	AVFilterContext *	filter,
		AVFilterLink *	in
	)

static

Definition at line 1275 of file avfilter.c.

Referenced by ff_filter_activate_default().

static int ff_filter_activate_default ( AVFilterContext * filter )

static

Definition at line 1309 of file avfilter.c.

Referenced by ff_filter_activate().

int ff_filter_activate ( AVFilterContext * filter )

Definition at line 1468 of file avfilter.c.

Referenced by ff_filter_graph_run_once().

int ff_inlink_acknowledge_status	(	AVFilterLink *	link,
		int *	rstatus,
		int64_t *	rpts
	)

Test and acknowledge the change of status on the link.

Status means EOF or an error condition; a change from the normal (0) status to a non-zero status can be queued in a filter's input link, it becomes relevant after the frames queued in the link's FIFO are processed. This function tests if frames are still queued and if a queued status change has not yet been processed. In that case it performs basic treatment (updating the link's timestamp) and returns a positive value to let the filter do its own treatments (flushing...).

Filters implementing the activate callback should call this function when they think it might succeed (usually after checking unsuccessfully for a queued frame). Filters implementing the filter_frame and request_frame callbacks do not need to call that since the same treatment happens in ff_filter_frame().

Parameters

[out]	rstatus	new or current status
[out]	rpts	current timestamp of the link in link time base

Returns: >0 if status changed, <0 if status already acked, 0 otherwise

Definition at line 1483 of file avfilter.c.

Referenced by get_frame_internal().

int ff_inlink_check_available_frame ( AVFilterLink * link )

Test if a frame is available on the link.

Returns: >0 if a frame is available

Definition at line 1498 of file avfilter.c.

Referenced by ff_inlink_consume_frame().

int ff_inlink_check_available_samples	(	AVFilterLink *	link,
		unsigned	min
	)

Test if enough samples are available on the link.

Returns: >0 if enough samples are available

Note: on EOF and error, min becomes 1

Definition at line 1503 of file avfilter.c.

Referenced by ff_inlink_consume_samples().

static void consume_update	(	AVFilterLink *	link,
		const AVFrame *	frame
	)

static

Definition at line 1510 of file avfilter.c.

Referenced by ff_inlink_consume_frame(), and ff_inlink_consume_samples().

int ff_inlink_consume_frame	(	AVFilterLink *	link,
		AVFrame **	rframe
	)

Take a frame from the link's FIFO and update the link's stats.

If ff_inlink_check_available_frame() was previously called, the preferred way of expressing it is "av_assert1(ret);" immediately after ff_inlink_consume_frame(). Negative error codes must still be checked.

Note: May trigger process_command() and/or update is_disabled.

Returns: >0 if a frame is available, 0 and set rframe to NULL if no frame available, or AVERROR code

Definition at line 1518 of file avfilter.c.

Referenced by ff_filter_frame_to_filter(), and get_frame_internal().

int ff_inlink_consume_samples	(	AVFilterLink *	link,
		unsigned	min,
		unsigned	max,
		AVFrame **	rframe
	)

Take samples from the link's FIFO and update the link's stats.

If ff_inlink_check_available_samples() was previously called, the preferred way of expressing it is "av_assert1(ret);" immediately after ff_inlink_consume_samples(). Negative error codes must still be checked.

Note: May trigger process_command() and/or update is_disabled.

Returns: >0 if a frame is available, 0 and set rframe to NULL if no frame available, or AVERROR code

Definition at line 1537 of file avfilter.c.

Referenced by ff_filter_frame_to_filter(), ff_inlink_consume_frame(), and get_frame_internal().

int ff_inlink_make_frame_writable	(	AVFilterLink *	link,
		AVFrame **	rframe
	)

Make sure a frame is writable.

This is similar to av_frame_make_writable() except it uses the link's buffer allocation callback, and therefore allows direct rendering.

Definition at line 1557 of file avfilter.c.

Referenced by ff_filter_frame_framed().

int ff_inlink_process_commands	(	AVFilterLink *	link,
		const AVFrame *	frame
	)

Process the commands queued in the link up to the time of the frame.

Commands will trigger the process_command() callback.

Returns: >= 0 or AVERROR code.

Definition at line 1606 of file avfilter.c.

Referenced by consume_update(), and ff_filter_frame_framed().

int ff_inlink_evaluate_timeline_at_frame	(	AVFilterLink *	link,
		const AVFrame *	frame
	)

Evaluate the timeline expression of the link for the time and properties of the frame.

Returns: >0 if enabled, 0 if disabled

Note: It does not update link->dst->is_disabled.

Definition at line 1621 of file avfilter.c.

Referenced by consume_update(), and ff_filter_frame_framed().

void ff_inlink_request_frame ( AVFilterLink * link )

Mark that a frame is wanted on the link.

Unlike ff_filter_frame(), it must not be called when the link has a non-zero status, and thus does not acknowledge it. Also it cannot fail.

Definition at line 1639 of file avfilter.c.

Referenced by get_frame_internal().

Variable Documentation

const char av_filter_ffversion[] = "FFmpeg version " FFMPEG_VERSION

Definition at line 47 of file avfilter.c.

const char* const var_names[]

static

Initial value:

= {
    "t",
    "n",
    "pos",
    "w",
    "h",
    NULL
}

Definition at line 468 of file avfilter.c.

Referenced by set_enable_expr().

AVFilter* first_filter

static

Definition at line 558 of file avfilter.c.

Referenced by avfilter_next().

AVFilter** last_filter = &first_filter

static

Definition at line 559 of file avfilter.c.

Referenced by avfilter_register(), configure_input_audio_filter(), configure_input_video_filter(), configure_output_audio_filter(), and configure_output_video_filter().

const AVOption avfilter_options[]

static

Initial value:

= {
    { "thread_type", "Allowed thread types", OFFSET(thread_type), AV_OPT_TYPE_FLAGS,
        { .i64 = AVFILTER_THREAD_SLICE }, 0, INT_MAX, FLAGS, "thread_type" },
        { "slice", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVFILTER_THREAD_SLICE }, .unit = "thread_type" },
    { "enable", "set enable expression", OFFSET(enable_str), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
    { "threads", "Allowed number of threads", OFFSET(nb_threads), AV_OPT_TYPE_INT,
        { .i64 = 0 }, 0, INT_MAX, FLAGS },
    { NULL },
}

Definition at line 659 of file avfilter.c.

const AVClass avfilter_class

static

Initial value:

= {
    .class_name = "AVFilter",
    .item_name  = default_filter_name,
    .version    = LIBAVUTIL_VERSION_INT,
    .category   = AV_CLASS_CATEGORY_FILTER,
    .child_next = filter_child_next,
    .child_class_next = filter_child_class_next,
    .option           = avfilter_options,
}

Definition at line 669 of file avfilter.c.

Referenced by avfilter_get_class(), and ff_filter_alloc().

Macros

Enumerations

Functions

Variables

Macro Definition Documentation

Enumeration Type Documentation

Function Documentation

Variable Documentation