libavfilter/avfiltergraph.c File Reference

#include <ctype.h>
#include <string.h>
#include "libavutil/audioconvert.h"
#include "libavutil/avassert.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "avfiltergraph.h"
#include "formats.h"
#include "internal.h"
#include "libavutil/log.h"

Go to the source code of this file.

Defines

#define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format)

Functions

AVFilterGraph * avfilter_graph_alloc (void)

Allocate a filter graph.

void avfilter_graph_free (AVFilterGraph **graph)

Free a graph, destroy its links, and set *graph to NULL.

int avfilter_graph_add_filter (AVFilterGraph *graph, AVFilterContext *filter)

Add an existing filter instance to a filter graph.

int avfilter_graph_create_filter (AVFilterContext **filt_ctx, AVFilter *filt, const char *name, const char *args, void *opaque, AVFilterGraph *graph_ctx)

Create and add a filter instance into an existing graph.

void avfilter_graph_set_auto_convert (AVFilterGraph *graph, unsigned flags)

Enable or disable automatic format conversion inside the graph.

int ff_avfilter_graph_check_validity (AVFilterGraph *graph, AVClass *log_ctx)

Check for the validity of graph.

int ff_avfilter_graph_config_links (AVFilterGraph *graph, AVClass *log_ctx)

Configure all the links of graphctx.

AVFilterContext * avfilter_graph_get_filter (AVFilterGraph *graph, char *name)

Get a filter instance with name name from graph.

static int insert_conv_filter (AVFilterGraph *graph, AVFilterLink *link, const char *filt_name, const char *filt_args)

static int query_formats (AVFilterGraph *graph, AVClass *log_ctx)

static int pick_format (AVFilterLink *link, AVFilterLink *ref)

static int reduce_formats_on_filter (AVFilterContext *filter)

static void reduce_formats (AVFilterGraph *graph)

static void swap_samplerates_on_filter (AVFilterContext *filter)

static void swap_samplerates (AVFilterGraph *graph)

static void swap_channel_layouts_on_filter (AVFilterContext *filter)

static void swap_channel_layouts (AVFilterGraph *graph)

static void swap_sample_fmts_on_filter (AVFilterContext *filter)

static void swap_sample_fmts (AVFilterGraph *graph)

static int pick_formats (AVFilterGraph *graph)

int ff_avfilter_graph_config_formats (AVFilterGraph *graph, AVClass *log_ctx)

Configure the formats of all the links in the graph.

static int ff_avfilter_graph_config_pointers (AVFilterGraph *graph, AVClass *log_ctx)

int avfilter_graph_config (AVFilterGraph *graphctx, void *log_ctx)

Check validity and configure all the links and formats in the graph.

int avfilter_graph_send_command (AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)

Send a command to one or more filter instances.

int avfilter_graph_queue_command (AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)

Queue a command for one or more filter instances.

static void heap_bubble_up (AVFilterGraph *graph, AVFilterLink *link, int index)

static void heap_bubble_down (AVFilterGraph *graph, AVFilterLink *link, int index)

void ff_avfilter_graph_update_heap (AVFilterGraph *graph, AVFilterLink *link)

Update the position of a link in the age heap.

int avfilter_graph_request_oldest (AVFilterGraph *graph)

Request a frame on the oldest sink link.

Variables

static const AVClass filtergraph_class

Define Documentation

#define REDUCE_FORMATS	(	fmt_type,
		list_type,
		list,
		var,
		nb,
		add_format	)

Definition at line 413 of file avfiltergraph.c.

Referenced by reduce_formats_on_filter().

Function Documentation

int avfilter_graph_add_filter	(	AVFilterGraph *	graphctx,
		AVFilterContext *	filter
	)

Add an existing filter instance to a filter graph.

Parameters:

	graphctx	the filter graph
	filter	the filter to be added

Definition at line 66 of file avfiltergraph.c.

Referenced by avfilter_graph_create_filter(), and create_filter().

AVFilterGraph* avfilter_graph_alloc ( void )

Allocate a filter graph.

Definition at line 43 of file avfiltergraph.c.

Referenced by configure_complex_filter(), configure_simple_filtergraph(), DEF_CHOOSE_FORMAT(), init_filters(), lavfi_read_header(), and video_thread().

int avfilter_graph_config	(	AVFilterGraph *	graphctx,
		void *	log_ctx
	)

Check validity and configure all the links and formats in the graph.

Parameters:

	graphctx	the filter graph
	log_ctx	context used for logging

Returns:: 0 in case of success, a negative AVERROR code otherwise

Definition at line 758 of file avfiltergraph.c.

Referenced by configure_complex_filter(), configure_simple_filtergraph(), init_filters(), lavfi_read_header(), main(), and transcode_init().

int avfilter_graph_create_filter	(	AVFilterContext **	filt_ctx,
		AVFilter *	filt,
		const char *	name,
		const char *	args,
		void *	opaque,
		AVFilterGraph *	graph_ctx
	)

Create and add a filter instance into an existing graph.

The filter instance is created from the filter filt and inited with the parameters args and opaque.

In case of success put in *filt_ctx the pointer to the created filter instance, otherwise set *filt_ctx to NULL.

Parameters:

	name	the instance name to give to the created filter instance
	graph_ctx	the filter graph

Returns:: a negative AVERROR error code in case of failure, a non negative value otherwise

Definition at line 79 of file avfiltergraph.c.

Referenced by configure_complex_filter(), configure_output_audio_filter(), configure_output_video_filter(), configure_video_filters(), DEF_CHOOSE_FORMAT(), init_filters(), insert_conv_filter(), lavfi_read_header(), and query_formats().

void avfilter_graph_free ( AVFilterGraph ** graph )

Free a graph, destroy its links, and set *graph to NULL.

If *graph is NULL, do nothing.

Definition at line 54 of file avfiltergraph.c.

Referenced by configure_complex_filter(), configure_simple_filtergraph(), DEF_CHOOSE_FORMAT(), exit_program(), lavfi_read_close(), main(), and video_thread().

AVFilterContext* avfilter_graph_get_filter	(	AVFilterGraph *	graph,
		char *	name
	)

Get a filter instance with name name from graph.

Returns:: the pointer to the found filter instance or NULL if it cannot be found.

Definition at line 152 of file avfiltergraph.c.

int avfilter_graph_queue_command	(	AVFilterGraph *	graph,
		const char *	target,
		const char *	cmd,
		const char *	arg,
		int	flags,
		double	ts
	)

Queue a command for one or more filter instances.

Parameters:

	graph	the filter graph
	target	the filter(s) to which the command should be sent "all" sends to all filters otherwise it can be a filter or filter instance name which will send the command to all matching filters.
	cmd	the command to sent, for handling simplicity all commands must be alphanummeric only
	arg	the argument for the command
	ts	time at which the command should be sent to the filter

Note:: As this executes commands after this function returns, no return code from the filter is provided, also AVFILTER_CMD_FLAG_ONE is not supported.

Definition at line 804 of file avfiltergraph.c.

Referenced by transcode().

int avfilter_graph_request_oldest ( AVFilterGraph * graph )

Request a frame on the oldest sink link.

If the request returns AVERROR_EOF, try the next.

Note that this function is not meant to be the sole scheduling mechanism of a filtergraph, only a convenience function to help drain a filtergraph in a balanced way under normal circumstances.

Returns:: the return value of avfilter_request_frame, or AVERROR_EOF of all links returned AVERROR_EOF.

Definition at line 878 of file avfiltergraph.c.

Referenced by poll_filters().

int avfilter_graph_send_command	(	AVFilterGraph *	graph,
		const char *	target,
		const char *	cmd,
		const char *	arg,
		char *	res,
		int	res_len,
		int	flags
	)

Send a command to one or more filter instances.

Parameters:

	graph	the filter graph
	target	the filter(s) to which the command should be sent "all" sends to all filters otherwise it can be a filter or filter instance name which will send the command to all matching filters.
	cmd	the command to sent, for handling simplicity all commands must be alphanumeric only
	arg	the argument for the command
	res	a buffer with size res_size where the filter(s) can return a response.

Returns:: >=0 on success otherwise an error code. AVERROR(ENOSYS) on unsupported commands

Definition at line 774 of file avfiltergraph.c.

Referenced by avfilter_graph_send_command(), and transcode().

void avfilter_graph_set_auto_convert	(	AVFilterGraph *	graph,
		unsigned	flags
	)

Enable or disable automatic format conversion inside the graph.

Note that format conversion can still happen inside explicitly inserted scale and aconvert filters.

Parameters:

flags

any of the AVFILTER_AUTO_CONVERT_* constants

Definition at line 100 of file avfiltergraph.c.

Referenced by choose_pix_fmts(), and configure_simple_filtergraph().

int ff_avfilter_graph_check_validity	(	AVFilterGraph *	graphctx,
		AVClass *	log_ctx
	)

Check for the validity of graph.

A graph is considered valid if all its input and output pads are connected.

Returns:: 0 in case of success, a negative value otherwise

Definition at line 105 of file avfiltergraph.c.

Referenced by avfilter_graph_config().

int ff_avfilter_graph_config_formats	(	AVFilterGraph *	graph,
		AVClass *	log_ctx
	)

Configure the formats of all the links in the graph.

Definition at line 691 of file avfiltergraph.c.

Referenced by avfilter_graph_config().

int ff_avfilter_graph_config_links	(	AVFilterGraph *	graphctx,
		AVClass *	log_ctx
	)

Configure all the links of graphctx.

Returns:: 0 in case of success, a negative value otherwise

Definition at line 135 of file avfiltergraph.c.

Referenced by avfilter_graph_config().

static int ff_avfilter_graph_config_pointers	(	AVFilterGraph *	graph,
		AVClass *	log_ctx
	)			`[static]`

Definition at line 716 of file avfiltergraph.c.

Referenced by avfilter_graph_config().

void ff_avfilter_graph_update_heap	(	AVFilterGraph *	graph,
		AVFilterLink *	link
	)

Update the position of a link in the age heap.

Definition at line 871 of file avfiltergraph.c.

Referenced by ff_update_link_current_pts().

static void heap_bubble_down	(	AVFilterGraph *	graph,
		AVFilterLink *	link,
		int	index
	)			`[static]`

Definition at line 849 of file avfiltergraph.c.

Referenced by avfilter_graph_request_oldest(), and ff_avfilter_graph_update_heap().

static void heap_bubble_up	(	AVFilterGraph *	graph,
		AVFilterLink *	link,
		int	index
	)			`[static]`

Definition at line 832 of file avfiltergraph.c.

Referenced by ff_avfilter_graph_update_heap().

static int insert_conv_filter	(	AVFilterGraph *	graph,
		AVFilterLink *	link,
		const char *	filt_name,
		const char *	filt_args
	)			`[static]`

Definition at line 163 of file avfiltergraph.c.

Referenced by query_formats().

static int pick_format	(	AVFilterLink *	link,
		AVFilterLink *	ref
	)			`[static]`

Definition at line 362 of file avfiltergraph.c.

Referenced by pick_formats().

static int pick_formats ( AVFilterGraph * graph ) [static]

Definition at line 642 of file avfiltergraph.c.

Referenced by ff_avfilter_graph_config_formats().

static int query_formats	(	AVFilterGraph *	graph,
		AVClass *	log_ctx
	)			`[static]`

Definition at line 216 of file avfiltergraph.c.

static void reduce_formats ( AVFilterGraph * graph ) [static]

Definition at line 462 of file avfiltergraph.c.

Referenced by ff_avfilter_graph_config_formats().

static int reduce_formats_on_filter ( AVFilterContext * filter ) [static]

Definition at line 448 of file avfiltergraph.c.

Referenced by reduce_formats().

static void swap_channel_layouts ( AVFilterGraph * graph ) [static]

Definition at line 566 of file avfiltergraph.c.

Referenced by ff_avfilter_graph_config_formats().

static void swap_channel_layouts_on_filter ( AVFilterContext * filter ) [static]

Definition at line 521 of file avfiltergraph.c.

Referenced by swap_channel_layouts().

static void swap_sample_fmts ( AVFilterGraph * graph ) [static]

Definition at line 633 of file avfiltergraph.c.

Referenced by ff_avfilter_graph_config_formats().

static void swap_sample_fmts_on_filter ( AVFilterContext * filter ) [static]

Definition at line 574 of file avfiltergraph.c.

Referenced by swap_sample_fmts().

static void swap_samplerates ( AVFilterGraph * graph ) [static]

Definition at line 513 of file avfiltergraph.c.

Referenced by ff_avfilter_graph_config_formats().

static void swap_samplerates_on_filter ( AVFilterContext * filter ) [static]

Definition at line 474 of file avfiltergraph.c.

Referenced by swap_samplerates().

Variable Documentation

const AVClass filtergraph_class [static]

Initial value:

 {
    .class_name = "AVFilterGraph",
    .item_name  = av_default_item_name,
    .version    = LIBAVUTIL_VERSION_INT,
}

Definition at line 37 of file avfiltergraph.c.


Defines
#define	REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format)
Functions
AVFilterGraph *	avfilter_graph_alloc (void)
	Allocate a filter graph.
void	avfilter_graph_free (AVFilterGraph **graph)
	Free a graph, destroy its links, and set *graph to NULL.
int	avfilter_graph_add_filter (AVFilterGraph graph, AVFilterContext filter)
	Add an existing filter instance to a filter graph.
int	avfilter_graph_create_filter (AVFilterContext *filt_ctx, AVFilter filt, const char name, const char args, void opaque, AVFilterGraph graph_ctx)
	Create and add a filter instance into an existing graph.
void	avfilter_graph_set_auto_convert (AVFilterGraph *graph, unsigned flags)
	Enable or disable automatic format conversion inside the graph.
int	ff_avfilter_graph_check_validity (AVFilterGraph graph, AVClass log_ctx)
	Check for the validity of graph.
int	ff_avfilter_graph_config_links (AVFilterGraph graph, AVClass log_ctx)
	Configure all the links of graphctx.
AVFilterContext *	avfilter_graph_get_filter (AVFilterGraph graph, char name)
	Get a filter instance with name name from graph.
static int	insert_conv_filter (AVFilterGraph graph, AVFilterLink link, const char filt_name, const char filt_args)
static int	query_formats (AVFilterGraph graph, AVClass log_ctx)
static int	pick_format (AVFilterLink link, AVFilterLink ref)
static int	reduce_formats_on_filter (AVFilterContext *filter)
static void	reduce_formats (AVFilterGraph *graph)
static void	swap_samplerates_on_filter (AVFilterContext *filter)
static void	swap_samplerates (AVFilterGraph *graph)
static void	swap_channel_layouts_on_filter (AVFilterContext *filter)
static void	swap_channel_layouts (AVFilterGraph *graph)
static void	swap_sample_fmts_on_filter (AVFilterContext *filter)
static void	swap_sample_fmts (AVFilterGraph *graph)
static int	pick_formats (AVFilterGraph *graph)
int	ff_avfilter_graph_config_formats (AVFilterGraph graph, AVClass log_ctx)
	Configure the formats of all the links in the graph.
static int	ff_avfilter_graph_config_pointers (AVFilterGraph graph, AVClass log_ctx)
int	avfilter_graph_config (AVFilterGraph graphctx, void log_ctx)
	Check validity and configure all the links and formats in the graph.
int	avfilter_graph_send_command (AVFilterGraph graph, const char target, const char cmd, const char arg, char *res, int res_len, int flags)
	Send a command to one or more filter instances.
int	avfilter_graph_queue_command (AVFilterGraph graph, const char target, const char command, const char arg, int flags, double ts)
	Queue a command for one or more filter instances.
static void	heap_bubble_up (AVFilterGraph graph, AVFilterLink link, int index)
static void	heap_bubble_down (AVFilterGraph graph, AVFilterLink link, int index)
void	ff_avfilter_graph_update_heap (AVFilterGraph graph, AVFilterLink link)
	Update the position of a link in the age heap.
int	avfilter_graph_request_oldest (AVFilterGraph *graph)
	Request a frame on the oldest sink link.
Variables
static const AVClass	filtergraph_class