libavfilter/avfiltergraph.h File Reference

#include "avfilter.h"

Go to the source code of this file.

Data Structures

struct AVFilterGraph

struct AVFilterInOut

A linked-list of the inputs/outputs of the filter chain. More...

Functions

AVFilterGraph * avfilter_graph_alloc (void)

Allocate a filter graph.

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

Get a filter instance with name name from graph.

int avfilter_graph_add_filter (AVFilterGraph *graphctx, 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.

int avfilter_graph_config (AVFilterGraph *graphctx, void *log_ctx)

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

void avfilter_graph_free (AVFilterGraph **graph)

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

AVFilterInOut * avfilter_inout_alloc (void)

Create an AVFilterInOut.

void avfilter_inout_free (AVFilterInOut **inout)

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

int avfilter_graph_parse (AVFilterGraph *graph, const char *filters, AVFilterInOut **inputs, AVFilterInOut **outputs, void *log_ctx)

Add a graph described by a string to a 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 *cmd, const char *arg, int flags, double ts)

Queue a command for one or more filter instances.

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 47 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 31 of file avfiltergraph.c.

Referenced by 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 288 of file avfiltergraph.c.

Referenced by init_filters(), lavfi_read_header(), and main().

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 60 of file avfiltergraph.c.

Referenced by init_filters(), insert_conv_filter(), and lavfi_read_header().

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 36 of file avfiltergraph.c.

Referenced by do_video_resample(), lavfi_read_close(), main(), transcode(), 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 128 of file avfiltergraph.c.

int avfilter_graph_parse	(	AVFilterGraph *	graph,
		const char *	filters,
		AVFilterInOut **	inputs,
		AVFilterInOut **	outputs,
		void *	log_ctx
	)

Add a graph described by a string to a graph.

Parameters:

	graph	the filter graph where to link the parsed graph context
	filters	string to be parsed
	inputs	pointer to a linked list to the inputs of the graph, may be NULL. If non-NULL, *inputs is updated to contain the list of open inputs after the parsing, should be freed with avfilter_inout_free().
	outputs	pointer to a linked list to the outputs of the graph, may be NULL. If non-NULL, *outputs is updated to contain the list of open outputs after the parsing, should be freed with avfilter_inout_free().

Returns:: non negative on success, a negative AVERROR code on error

Definition at line 337 of file graphparser.c.

Referenced by init_filters(), lavfi_read_header(), and main().

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 332 of file avfiltergraph.c.

Referenced by transcode().

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 302 of file avfiltergraph.c.

Referenced by avfilter_graph_send_command(), and transcode().

AVFilterInOut* avfilter_inout_alloc ( void )

Create an AVFilterInOut.

Must be free with avfilter_inout_free().

Definition at line 173 of file graphparser.c.

Referenced by init_filters().

void avfilter_inout_free ( AVFilterInOut ** inout )

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

If *inout is NULL, do nothing.

Definition at line 178 of file graphparser.c.

Referenced by avfilter_graph_parse(), and lavfi_read_header().


Data Structures
struct	AVFilterGraph
struct	AVFilterInOut
	A linked-list of the inputs/outputs of the filter chain. More...
Functions
AVFilterGraph *	avfilter_graph_alloc (void)
	Allocate a filter graph.
AVFilterContext *	avfilter_graph_get_filter (AVFilterGraph graph, char name)
	Get a filter instance with name name from graph.
int	avfilter_graph_add_filter (AVFilterGraph graphctx, 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.
int	avfilter_graph_config (AVFilterGraph graphctx, void log_ctx)
	Check validity and configure all the links and formats in the graph.
void	avfilter_graph_free (AVFilterGraph **graph)
	Free a graph, destroy its links, and set *graph to NULL.
AVFilterInOut *	avfilter_inout_alloc (void)
	Create an AVFilterInOut.
void	avfilter_inout_free (AVFilterInOut **inout)
	Free the AVFilterInOut in *inout, and set its pointer to NULL.
int	avfilter_graph_parse (AVFilterGraph graph, const char filters, AVFilterInOut inputs, AVFilterInOut outputs, void *log_ctx)
	Add a graph described by a string to a 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 cmd, const char arg, int flags, double ts)
	Queue a command for one or more filter instances.