#include <string.h>
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavcodec/avcodec.h"
#include "avfilter.h"
#include "avfiltergraph.h"
#include "formats.h"
#include "internal.h"

Macros
#define	OFFSET(x) offsetof(AVFilterGraph,x)

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

#define	CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER \| AV_CH_FRONT_RIGHT_OF_CENTER)

#define	CH_FRONT_PAIR (AV_CH_FRONT_LEFT \| AV_CH_FRONT_RIGHT)

#define	CH_STEREO_PAIR (AV_CH_STEREO_LEFT \| AV_CH_STEREO_RIGHT)

#define	CH_WIDE_PAIR (AV_CH_WIDE_LEFT \| AV_CH_WIDE_RIGHT)

#define	CH_SIDE_PAIR (AV_CH_SIDE_LEFT \| AV_CH_SIDE_RIGHT)

#define	CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT \| AV_CH_SURROUND_DIRECT_RIGHT)

#define	CH_BACK_PAIR (AV_CH_BACK_LEFT \| AV_CH_BACK_RIGHT)

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.

static int	graph_check_validity (AVFilterGraph graph, AVClass log_ctx)
	Check for the validity of graph.

static int	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 void	sanitize_channel_layouts (void log, AVFilterChannelLayouts l)

static int	filter_query_formats (AVFilterContext *ctx)

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)

static int	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)

static int	graph_insert_fifos (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 AVOption	options []

static const AVClass	filtergraph_class

static const uint64_t	ch_subst [][2]

Macro Definition Documentation

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

Definition at line 35 of file avfiltergraph.c.

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

Definition at line 432 of file avfiltergraph.c.

Referenced by reduce_formats_on_filter().

#define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)

Definition at line 574 of file avfiltergraph.c.

#define CH_FRONT_PAIR (AV_CH_FRONT_LEFT | AV_CH_FRONT_RIGHT)

Definition at line 575 of file avfiltergraph.c.

#define CH_STEREO_PAIR (AV_CH_STEREO_LEFT | AV_CH_STEREO_RIGHT)

Definition at line 576 of file avfiltergraph.c.

#define CH_WIDE_PAIR (AV_CH_WIDE_LEFT | AV_CH_WIDE_RIGHT)

Definition at line 577 of file avfiltergraph.c.

#define CH_SIDE_PAIR (AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT)

Definition at line 578 of file avfiltergraph.c.

#define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)

Definition at line 579 of file avfiltergraph.c.

#define CH_BACK_PAIR (AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT)

Definition at line 580 of file avfiltergraph.c.

Function Documentation

AVFilterGraph* avfilter_graph_alloc ( void )

Allocate a filter graph.

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

Definition at line 52 of file avfiltergraph.c.

Referenced by configure_filtergraph(), init_filters(), lavfi_read_header(), and video_thread().

void avfilter_graph_free ( AVFilterGraph ** graph )

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

If *graph is NULL, do nothing.

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

Definition at line 61 of file avfiltergraph.c.

Referenced by configure_filtergraph(), exit_program(), lavfi_read_close(), main(), and video_thread().

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 75 of file avfiltergraph.c.

Referenced by avfilter_graph_create_filter(), and create_filter().

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

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

Definition at line 88 of file avfiltergraph.c.

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

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 109 of file avfiltergraph.c.

Referenced by choose_pix_fmts().

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

static

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 122 of file avfiltergraph.c.

Referenced by avfilter_graph_config().

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

static

Configure all the links of graphctx.

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

Definition at line 160 of file avfiltergraph.c.

Referenced by avfilter_graph_config().

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 177 of file avfiltergraph.c.

static void sanitize_channel_layouts	(	void *	log,
		AVFilterChannelLayouts *	l
	)

static

Definition at line 188 of file avfiltergraph.c.

Referenced by filter_query_formats().

static int filter_query_formats ( AVFilterContext * ctx )

static

Definition at line 203 of file avfiltergraph.c.

Referenced by query_formats().

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

static

Definition at line 241 of file avfiltergraph.c.

Referenced by graph_config_formats().

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

static

Definition at line 374 of file avfiltergraph.c.

Referenced by pick_formats().

static int reduce_formats_on_filter ( AVFilterContext * filter )

static

Definition at line 467 of file avfiltergraph.c.

Referenced by reduce_formats().

static void reduce_formats ( AVFilterGraph * graph )

static

Definition at line 515 of file avfiltergraph.c.

Referenced by graph_config_formats().

static void swap_samplerates_on_filter ( AVFilterContext * filter )

static

Definition at line 527 of file avfiltergraph.c.

Referenced by swap_samplerates().

static void swap_samplerates ( AVFilterGraph * graph )

static

Definition at line 566 of file avfiltergraph.c.

Referenced by graph_config_formats().

static void swap_channel_layouts_on_filter ( AVFilterContext * filter )

static

Definition at line 608 of file avfiltergraph.c.

Referenced by swap_channel_layouts().

static void swap_channel_layouts ( AVFilterGraph * graph )

static

Definition at line 697 of file avfiltergraph.c.

Referenced by graph_config_formats().

static void swap_sample_fmts_on_filter ( AVFilterContext * filter )

static

Definition at line 705 of file avfiltergraph.c.

Referenced by swap_sample_fmts().

static void swap_sample_fmts ( AVFilterGraph * graph )

static

Definition at line 765 of file avfiltergraph.c.

Referenced by graph_config_formats().

static int pick_formats ( AVFilterGraph * graph )

static

Definition at line 774 of file avfiltergraph.c.

Referenced by graph_config_formats().

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

static

Configure the formats of all the links in the graph.

Definition at line 829 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 854 of file avfiltergraph.c.

Referenced by avfilter_graph_config().

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

static

Definition at line 896 of file avfiltergraph.c.

Referenced by avfilter_graph_config().

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

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

Definition at line 934 of file avfiltergraph.c.

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

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 952 of file avfiltergraph.c.

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

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 982 of file avfiltergraph.c.

Referenced by check_keyboard_interaction().

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

static

Definition at line 1010 of file avfiltergraph.c.

Referenced by ff_avfilter_graph_update_heap().

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

static

Definition at line 1027 of file avfiltergraph.c.

Referenced by avfilter_graph_request_oldest(), and ff_avfilter_graph_update_heap().

void ff_avfilter_graph_update_heap	(	AVFilterGraph *	graph,
		AVFilterLink *	link
	)

Update the position of a link in the age heap.

Definition at line 1049 of file avfiltergraph.c.

Referenced by ff_update_link_current_pts().

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.

Also note that AVERROR_EOF does not mean that frames did not arrive on some of the sinks during the process. When there are multiple sink links, in case the requested link returns an EOF, this may cause a filter to flush pending frames which are sent to another sink link, although unrequested.

Returns: the return value of ff_request_frame(), or AVERROR_EOF if all links returned AVERROR_EOF

Definition at line 1056 of file avfiltergraph.c.

Referenced by transcode_from_filter().

Variable Documentation

const AVOption options[]

static

Initial value:

={
{"scale_sws_opts"       , "default scale filter options"        , OFFSET(scale_sws_opts)        ,  AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, 0 },
{"aresample_swr_opts"   , "default aresample filter options"    , OFFSET(aresample_swr_opts)    ,  AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, 0 },
{0}
}

Definition at line 37 of file avfiltergraph.c.

const AVClass filtergraph_class

static

Initial value:

= {
    .class_name = "AVFilterGraph",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
    .category   = AV_CLASS_CATEGORY_FILTER,
}

Definition at line 44 of file avfiltergraph.c.

Referenced by avfilter_graph_alloc().

const uint64_t ch_subst[][2]

static

Initial value:

= {
    { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
    { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
    { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
    { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
    { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
    { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
    { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
    { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
    { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
    { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
    { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
    { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
    { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
    { CH_SIDE_PAIR,       CH_BACK_PAIR       },
    { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
    { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
    { CH_BACK_PAIR,       CH_SIDE_PAIR       },
    { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
    { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
    { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
    { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
}

Definition at line 584 of file avfiltergraph.c.

Referenced by swap_channel_layouts_on_filter().

Macros

Functions

Variables

Macro Definition Documentation

Function Documentation

Variable Documentation