FFmpeg
Macros | Functions | Variables
avfiltergraph.c File Reference
#include "config.h"
#include <string.h>
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/bprint.h"
#include "libavutil/channel_layout.h"
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "framequeue.h"
#include "avfilter.h"
#include "buffersink.h"
#include "formats.h"
#include "internal.h"
#include "thread.h"

Go to the source code of this file.

Macros

#define FF_INTERNAL_FIELDS   1
 
#define OFFSET(x)   offsetof(AVFilterGraph, x)
 
#define F   AV_OPT_FLAG_FILTERING_PARAM
 
#define V   AV_OPT_FLAG_VIDEO_PARAM
 
#define A   AV_OPT_FLAG_AUDIO_PARAM
 
#define CHECKED_MERGE(field, ...)   ((ret = ff_merge_ ## field(__VA_ARGS__)) <= 0)
 
#define MERGE_DISPATCH(field, ...)
 
#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

void ff_graph_thread_free (AVFilterGraph *graph)
 
int ff_graph_thread_init (AVFilterGraph *graph)
 
AVFilterGraphavfilter_graph_alloc (void)
 Allocate a filter graph. More...
 
void ff_filter_graph_remove_filter (AVFilterGraph *graph, AVFilterContext *filter)
 Remove a filter from a graph;. More...
 
void avfilter_graph_free (AVFilterGraph **graph)
 Free a graph, destroy its links, and set *graph to NULL. More...
 
int avfilter_graph_create_filter (AVFilterContext **filt_ctx, const AVFilter *filt, const char *name, const char *args, void *opaque, AVFilterGraph *graph_ctx)
 Create and add a filter instance into an existing graph. More...
 
void avfilter_graph_set_auto_convert (AVFilterGraph *graph, unsigned flags)
 Enable or disable automatic format conversion inside the graph. More...
 
AVFilterContextavfilter_graph_alloc_filter (AVFilterGraph *graph, const AVFilter *filter, const char *name)
 Create a new filter instance in a filter graph. More...
 
static int graph_check_validity (AVFilterGraph *graph, AVClass *log_ctx)
 Check for the validity of graph. More...
 
static int graph_config_links (AVFilterGraph *graph, AVClass *log_ctx)
 Configure all the links of graphctx. More...
 
static int graph_check_links (AVFilterGraph *graph, AVClass *log_ctx)
 
AVFilterContextavfilter_graph_get_filter (AVFilterGraph *graph, const char *name)
 Get a filter instance identified by instance name from graph. More...
 
static void sanitize_channel_layouts (void *log, AVFilterChannelLayouts *l)
 
static int filter_link_check_formats (void *log, AVFilterLink *link, AVFilterFormatsConfig *cfg)
 
static int filter_check_formats (AVFilterContext *ctx)
 Check the validity of the formats / etc. More...
 
static int filter_query_formats (AVFilterContext *ctx)
 
static int formats_declared (AVFilterContext *f)
 
static int query_formats (AVFilterGraph *graph, AVClass *log_ctx)
 Perform one round of query_formats() and merging formats lists on the filter graph. More...
 
static int get_fmt_score (enum AVSampleFormat dst_fmt, enum AVSampleFormat src_fmt)
 
static enum AVSampleFormat find_best_sample_fmt_of_2 (enum AVSampleFormat dst_fmt1, enum AVSampleFormat dst_fmt2, enum AVSampleFormat src_fmt)
 
static int pick_format (AVFilterLink *link, AVFilterLink *ref)
 
static int reduce_formats_on_filter (AVFilterContext *filter)
 
static int 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. More...
 
static int 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. More...
 
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. More...
 
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. More...
 
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. More...
 
int avfilter_graph_request_oldest (AVFilterGraph *graph)
 Request a frame on the oldest sink link. More...
 
int ff_filter_graph_run_once (AVFilterGraph *graph)
 Run one round of processing on a filter graph. More...
 

Variables

static const AVOption filtergraph_options []
 
static const AVClass filtergraph_class
 
static const uint64_t ch_subst [][2]
 

Macro Definition Documentation

#define FF_INTERNAL_FIELDS   1

Definition at line 36 of file avfiltergraph.c.

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

Definition at line 45 of file avfiltergraph.c.

Definition at line 46 of file avfiltergraph.c.

#define V   AV_OPT_FLAG_VIDEO_PARAM

Definition at line 47 of file avfiltergraph.c.

#define A   AV_OPT_FLAG_AUDIO_PARAM

Definition at line 48 of file avfiltergraph.c.

#define CHECKED_MERGE (   field,
  ... 
)    ((ret = ff_merge_ ## field(__VA_ARGS__)) <= 0)

Referenced by query_formats().

#define MERGE_DISPATCH (   field,
  ... 
)
Value:
if (!(link->incfg.field && link->outcfg.field)) { \
count_delayed++; \
} else if (link->incfg.field == link->outcfg.field) { \
count_already_merged++; \
} else if (!convert_needed) { \
count_merged++; \
if (CHECKED_MERGE(field, __VA_ARGS__)) { \
if (ret < 0) \
convert_needed = 1; \
} \
}
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this field
if(ret)
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a link
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a it should return
#define CHECKED_MERGE(field,...)

Referenced by query_formats().

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

Definition at line 740 of file avfiltergraph.c.

Referenced by reduce_formats_on_filter().

Definition at line 893 of file avfiltergraph.c.

#define CH_FRONT_PAIR   (AV_CH_FRONT_LEFT | AV_CH_FRONT_RIGHT)

Definition at line 894 of file avfiltergraph.c.

#define CH_STEREO_PAIR   (AV_CH_STEREO_LEFT | AV_CH_STEREO_RIGHT)

Definition at line 895 of file avfiltergraph.c.

#define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT | AV_CH_WIDE_RIGHT)

Definition at line 896 of file avfiltergraph.c.

#define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT)

Definition at line 897 of file avfiltergraph.c.

Definition at line 898 of file avfiltergraph.c.

#define CH_BACK_PAIR   (AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT)

Definition at line 899 of file avfiltergraph.c.

Function Documentation

void ff_graph_thread_free ( AVFilterGraph graph)

Definition at line 71 of file avfiltergraph.c.

Referenced by avfilter_graph_free().

int ff_graph_thread_init ( AVFilterGraph graph)

Definition at line 75 of file avfiltergraph.c.

Referenced by avfilter_graph_alloc_filter().

void ff_filter_graph_remove_filter ( AVFilterGraph graph,
AVFilterContext filter 
)

Remove a filter from a graph;.

Definition at line 102 of file avfiltergraph.c.

Referenced by avfilter_free().

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 214 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 252 of file avfiltergraph.c.

Referenced by avfilter_graph_config().

static int graph_check_links ( AVFilterGraph graph,
AVClass log_ctx 
)
static

Definition at line 269 of file avfiltergraph.c.

Referenced by avfilter_graph_config().

static void sanitize_channel_layouts ( void log,
AVFilterChannelLayouts l 
)
static

Definition at line 301 of file avfiltergraph.c.

Referenced by filter_query_formats().

static int filter_link_check_formats ( void log,
AVFilterLink link,
AVFilterFormatsConfig cfg 
)
static

Definition at line 316 of file avfiltergraph.c.

Referenced by filter_check_formats().

static int filter_check_formats ( AVFilterContext ctx)
static

Check the validity of the formats / etc.

lists set by query_formats().

In particular, check they do not contain any redundant element.

Definition at line 345 of file avfiltergraph.c.

Referenced by filter_query_formats().

static int filter_query_formats ( AVFilterContext ctx)
static

Definition at line 363 of file avfiltergraph.c.

Referenced by query_formats().

static int formats_declared ( AVFilterContext f)
static

Definition at line 402 of file avfiltergraph.c.

Referenced by query_formats().

static int query_formats ( AVFilterGraph graph,
AVClass log_ctx 
)
static

Perform one round of query_formats() and merging formats lists on the filter graph.

Returns
>=0 if all links formats lists could be queried and merged; AVERROR(EAGAIN) some progress was made in the queries or merging and a later call may succeed; AVERROR(EIO) (may be changed) plus a log message if no progress was made and the negotiation is stuck; a negative error code if some other error happened

Definition at line 435 of file avfiltergraph.c.

Referenced by graph_config_formats().

static int get_fmt_score ( enum AVSampleFormat  dst_fmt,
enum AVSampleFormat  src_fmt 
)
static

Definition at line 630 of file avfiltergraph.c.

Referenced by find_best_sample_fmt_of_2().

static enum AVSampleFormat find_best_sample_fmt_of_2 ( enum AVSampleFormat  dst_fmt1,
enum AVSampleFormat  dst_fmt2,
enum AVSampleFormat  src_fmt 
)
static

Definition at line 653 of file avfiltergraph.c.

Referenced by pick_format().

static int pick_format ( AVFilterLink link,
AVFilterLink ref 
)
static

Definition at line 664 of file avfiltergraph.c.

Referenced by pick_formats().

static int reduce_formats_on_filter ( AVFilterContext filter)
static

Definition at line 777 of file avfiltergraph.c.

Referenced by reduce_formats().

static int reduce_formats ( AVFilterGraph graph)
static

Definition at line 827 of file avfiltergraph.c.

Referenced by graph_config_formats().

static void swap_samplerates_on_filter ( AVFilterContext filter)
static

Definition at line 844 of file avfiltergraph.c.

Referenced by swap_samplerates().

static void swap_samplerates ( AVFilterGraph graph)
static

Definition at line 885 of file avfiltergraph.c.

Referenced by graph_config_formats().

static void swap_channel_layouts_on_filter ( AVFilterContext filter)
static

Definition at line 927 of file avfiltergraph.c.

Referenced by swap_channel_layouts().

static void swap_channel_layouts ( AVFilterGraph graph)
static

Definition at line 1016 of file avfiltergraph.c.

Referenced by graph_config_formats().

static void swap_sample_fmts_on_filter ( AVFilterContext filter)
static

Definition at line 1024 of file avfiltergraph.c.

Referenced by swap_sample_fmts().

static void swap_sample_fmts ( AVFilterGraph graph)
static

Definition at line 1084 of file avfiltergraph.c.

Referenced by graph_config_formats().

static int pick_formats ( AVFilterGraph graph)
static

Definition at line 1093 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 1148 of file avfiltergraph.c.

Referenced by avfilter_graph_config().

static int graph_config_pointers ( AVFilterGraph graph,
AVClass log_ctx 
)
static

Definition at line 1176 of file avfiltergraph.c.

Referenced by avfilter_graph_config().

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

Definition at line 1297 of file avfiltergraph.c.

Referenced by ff_avfilter_graph_update_heap().

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

Update the position of a link in the age heap.

Definition at line 1340 of file avfiltergraph.c.

Referenced by ff_update_link_current_pts().

int ff_filter_graph_run_once ( AVFilterGraph graph)

Run one round of processing on a filter graph.

Definition at line 1391 of file avfiltergraph.c.

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

Variable Documentation

const AVOption filtergraph_options[]
static
Initial value:
= {
{ "thread_type", "Allowed thread types", OFFSET(thread_type), AV_OPT_TYPE_FLAGS,
{ .i64 = AVFILTER_THREAD_SLICE }, 0, INT_MAX, F|V|A, "thread_type" },
{ "slice", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVFILTER_THREAD_SLICE }, .flags = F|V|A, .unit = "thread_type" },
{ "threads", "Maximum number of threads", OFFSET(nb_threads),
AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, F|V|A },
{"scale_sws_opts" , "default scale filter options" , OFFSET(scale_sws_opts) ,
AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, F|V },
{"aresample_swr_opts" , "default aresample filter options" , OFFSET(aresample_swr_opts) ,
AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, F|A },
{ NULL },
}
#define NULL
Definition: coverity.c:32
#define AVFILTER_THREAD_SLICE
Process multiple parts of the frame concurrently.
Definition: avfilter.h:334
#define OFFSET(x)
Definition: avfiltergraph.c:45
#define V
Definition: avfiltergraph.c:47
#define F
Definition: avfiltergraph.c:46
#define A
Definition: avfiltergraph.c:48

Definition at line 49 of file avfiltergraph.c.

const AVClass filtergraph_class
static
Initial value:
= {
.class_name = "AVFilterGraph",
.item_name = av_default_item_name,
}
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
static const AVOption filtergraph_options[]
Definition: avfiltergraph.c:49

Definition at line 62 of file avfiltergraph.c.

Referenced by avfilter_graph_alloc().

const uint64_t ch_subst[][2]
static
Initial value:
= {
{ 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_BACK_PAIR, CH_DIRECT_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 },
}
#define CH_DIRECT_PAIR
#define CH_CENTER_PAIR
#define AV_CH_FRONT_CENTER
#define CH_BACK_PAIR
#define AV_CH_BACK_CENTER
#define CH_FRONT_PAIR
#define CH_SIDE_PAIR
#define CH_WIDE_PAIR

Definition at line 903 of file avfiltergraph.c.

Referenced by swap_channel_layouts_on_filter().