internal API functions More...

#include "libavutil/internal.h"
#include "avfilter.h"
#include "avfiltergraph.h"
#include "formats.h"
#include "framepool.h"
#include "framequeue.h"
#include "thread.h"
#include "version.h"
#include "video.h"
#include "libavcodec/avcodec.h"

Data Structures
struct	AVFilterCommand

struct	AVFilterPad
	A filter pad used for either input or output. More...

struct	AVFilterGraphInternal

struct	AVFilterInternal

Macros
#define	ff_tlog(pctx,...) do { if (0) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__); } while (0)

#define	FF_TPRINTF_START(ctx, func) ff_tlog(NULL, "%-16s: ", #func)

#define	AVFILTER_DEFINE_CLASS(fname)

#define	FF_INLINK_IDX(link) ((int)((link)->dstpad - (link)->dst->input_pads))
	Find the index of a link. More...

#define	FF_OUTLINK_IDX(link) ((int)((link)->srcpad - (link)->src->output_pads))

#define	FF_FILTER_FLAG_HWFRAME_AWARE (1 << 0)
	The filter is aware of hardware frames, and any hardware frame context should not be automatically propagated through it. More...

Functions
void	ff_avfilter_graph_update_heap (AVFilterGraph graph, AVFilterLink link)
	Update the position of a link in the age heap. More...

int	ff_fmt_is_in (int fmt, const int *fmts)
	Tell if an integer is contained in the provided -1-terminated list of integers. More...

av_warn_unused_result int	ff_parse_pixel_format (enum AVPixelFormat ret, const char arg, void *log_ctx)
	Parse a pixel format. More...

av_warn_unused_result int	ff_parse_sample_rate (int ret, const char arg, void *log_ctx)
	Parse a sample rate. More...

av_warn_unused_result int	ff_parse_time_base (AVRational ret, const char arg, void *log_ctx)
	Parse a time base. More...

av_warn_unused_result int	ff_parse_sample_format (int ret, const char arg, void *log_ctx)
	Parse a sample format name or a corresponding integer representation. More...

av_warn_unused_result int	ff_parse_channel_layout (int64_t ret, int nret, const char arg, void log_ctx)
	Parse a channel layout or a corresponding integer representation. More...

void	ff_update_link_current_pts (AVFilterLink *link, int64_t pts)

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	ff_command_queue_pop (AVFilterContext *filter)

char *	ff_get_ref_perms_string (char *buf, size_t buf_size, int perms)

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

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

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

static int	ff_insert_inpad (AVFilterContext f, unsigned index, AVFilterPad p)
	Insert a new input pad for the filter. More...

static int	ff_insert_outpad (AVFilterContext f, unsigned index, AVFilterPad p)
	Insert a new output pad for the filter. More...

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

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

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

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

int	ff_filter_activate (AVFilterContext *filter)

void	ff_filter_graph_remove_filter (AVFilterGraph graph, AVFilterContext filter)
	Remove a filter from a graph;. More...

int	ff_filter_graph_run_once (AVFilterGraph *graph)
	Run one round of processing on a filter graph. More...

static int	ff_norm_qscale (int qscale, int type)
	Normalize the qscale factor FIXME the H264 qscale is a log based scale, mpeg1/2 is not, the code below cannot be optimal. More...

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

Detailed Description

internal API functions

Definition in file internal.h.

Macro Definition Documentation

#define ff_tlog	(	pctx,
		...
	)	do { if (0) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__); } while (0)

Definition at line 255 of file internal.h.

#define FF_TPRINTF_START	(	ctx,
		func
	)	ff_tlog(NULL, "%-16s: ", #func)

Definition at line 258 of file internal.h.

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

#define AVFILTER_DEFINE_CLASS ( fname )

Value:

static const AVClass fname##_class = {      \
        .class_name = #fname,                   \
        .item_name  = av_default_item_name,     \
        .option     = fname##_options,          \
        .version    = LIBAVUTIL_VERSION_INT,    \
        .category   = AV_CLASS_CATEGORY_FILTER, \
    }

Definition at line 342 of file internal.h.

#define FF_INLINK_IDX ( link ) ((int)((link)->dstpad - (link)->dst->input_pads))

Find the index of a link.

I.e. find i such that link == ctx->(in|out)puts[i]

Definition at line 356 of file internal.h.

Referenced by config_input(), ff_framesync_filter_frame(), filter_frame(), get_audio_buffer(), get_video_buffer(), and process_frame().

#define FF_OUTLINK_IDX ( link ) ((int)((link)->srcpad - (link)->src->output_pads))

Definition at line 357 of file internal.h.

Referenced by config_output(), movie_config_output_props(), movie_request_frame(), and request_frame().

#define FF_FILTER_FLAG_HWFRAME_AWARE (1 << 0)

The filter is aware of hardware frames, and any hardware frame context should not be automatically propagated through it.

Definition at line 393 of file internal.h.

Referenced by avfilter_config_links().

Function Documentation

void ff_avfilter_graph_update_heap	(	AVFilterGraph *	graph,
		AVFilterLink *	link
	)

Update the position of a link in the age heap.

Definition at line 1386 of file avfiltergraph.c.

Referenced by ff_update_link_current_pts().

int ff_fmt_is_in	(	int	fmt,
		const int *	fmts
	)

Tell if an integer is contained in the provided -1-terminated list of integers.

This is useful for determining (for instance) if an AVPixelFormat is in an array of supported formats.

Parameters

fmt	provided format
fmts	-1-terminated list of formats

Returns: 1 if present, 0 if absent

Definition at line 254 of file formats.c.

Referenced by config_input(), config_input_main(), config_input_overlay(), config_out_props(), and config_props().

av_warn_unused_result int ff_parse_pixel_format	(	enum AVPixelFormat *	ret,
		const char *	arg,
		void *	log_ctx
	)

Parse a pixel format.

Parameters

ret	pixel format pointer to where the value should be written
arg	string to parse
log_ctx	log context

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

Definition at line 609 of file formats.c.

Referenced by init().

av_warn_unused_result int ff_parse_sample_rate	(	int *	ret,
		const char *	arg,
		void *	log_ctx
	)

Parse a sample rate.

Parameters

ret	unsigned integer pointer to where the value should be written
arg	string to parse
log_ctx	log context

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

Definition at line 650 of file formats.c.

Referenced by init().

av_warn_unused_result int ff_parse_time_base	(	AVRational *	ret,
		const char *	arg,
		void *	log_ctx
	)

Parse a time base.

Parameters

ret	unsigned AVRational pointer to where the value should be written
arg	string to parse
log_ctx	log context

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

Definition at line 639 of file formats.c.

av_warn_unused_result int ff_parse_sample_format	(	int *	ret,
		const char *	arg,
		void *	log_ctx
	)

Parse a sample format name or a corresponding integer representation.

Parameters

ret	integer pointer to where the value should be written
arg	string to parse
log_ctx	log context

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

Definition at line 624 of file formats.c.

av_warn_unused_result int ff_parse_channel_layout	(	int64_t *	ret,
		int *	nret,
		const char *	arg,
		void *	log_ctx
	)

Parse a channel layout or a corresponding integer representation.

Parameters

ret	64bit integer pointer to where the value should be written.
nret	integer pointer to the number of channels; if not NULL, then unknown channel layouts are accepted
arg	string to parse
log_ctx	log context

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

Definition at line 662 of file formats.c.

Referenced by init(), and main().

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().

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_command_queue_pop ( AVFilterContext * filter )

Definition at line 94 of file avfilter.c.

Referenced by avfilter_free(), and ff_inlink_process_commands().

char* ff_get_ref_perms_string	(	char *	buf,
		size_t	buf_size,
		int	perms
	)

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_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_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().

static int ff_insert_inpad	(	AVFilterContext *	f,
		unsigned	index,
		AVFilterPad *	p
	)

inlinestatic

Insert a new input pad for the filter.

Definition at line 285 of file internal.h.

Referenced by decimate_init(), fieldmatch_init(), init(), join_init(), and parse_definition().

static int ff_insert_outpad	(	AVFilterContext *	f,
		unsigned	index,
		AVFilterPad *	p
	)

inlinestatic

Insert a new output pad for the filter.

Definition at line 293 of file internal.h.

Referenced by init(), movie_common_init(), parse_definition(), and split_init().

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().

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().

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().

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().

int ff_filter_activate ( AVFilterContext * filter )

Definition at line 1468 of file avfilter.c.

Referenced by ff_filter_graph_run_once().

void ff_filter_graph_remove_filter	(	AVFilterGraph *	graph,
		AVFilterContext *	filter
	)

Remove a filter from a graph;.

Definition at line 99 of file avfiltergraph.c.

Referenced by avfilter_free().

int ff_filter_graph_run_once ( AVFilterGraph * graph )

Run one round of processing on a filter graph.

Definition at line 1437 of file avfiltergraph.c.

Referenced by avfilter_graph_request_oldest(), get_frame_internal(), and push_frame().

static int ff_norm_qscale	(	int	qscale,
		int	type
	)

inlinestatic

Normalize the qscale factor FIXME the H264 qscale is a log based scale, mpeg1/2 is not, the code below cannot be optimal.

Definition at line 405 of file internal.h.

Referenced by filter(), and filter_frame().

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().

Data Structures

Macros

Functions

Detailed Description

Macro Definition Documentation

Function Documentation