FFmpeg: libavfilter/graphparser.c File Reference

FFmpeg

libavfilter

graphparser.c File Reference

#include <string.h>
#include <stdio.h>
#include "libavutil/avstring.h"
#include "libavutil/mem.h"
#include "avfilter.h"

Go to the source code of this file.

Macros

#define WHITESPACES " \n\t"

Functions

static int link_filter (AVFilterContext *src, int srcpad, AVFilterContext *dst, int dstpad, void *log_ctx)

Link two filters together.

static char * parse_link_name (const char **buf, void *log_ctx)

Parse the name of a link, which has the format "[linkname]".

static int create_filter (AVFilterContext **filt_ctx, AVFilterGraph *ctx, int index, const char *filt_name, const char *args, void *log_ctx)

Create an instance of a filter, initialize and insert it in the filtergraph in *ctx.

static int parse_filter (AVFilterContext **filt_ctx, const char **buf, AVFilterGraph *graph, int index, void *log_ctx)

Parse a string of the form FILTER_NAME[=PARAMS], and create a corresponding filter instance which is added to graph with create_filter().

AVFilterInOut * avfilter_inout_alloc (void)

Allocate a single AVFilterInOut entry.

void avfilter_inout_free (AVFilterInOut **inout)

Free the supplied list of AVFilterInOut and set *inout to NULL.

static AVFilterInOut * extract_inout (const char *label, AVFilterInOut **links)

static void insert_inout (AVFilterInOut **inouts, AVFilterInOut *element)

static void append_inout (AVFilterInOut **inouts, AVFilterInOut **element)

static int link_filter_inouts (AVFilterContext *filt_ctx, AVFilterInOut **curr_inputs, AVFilterInOut **open_inputs, void *log_ctx)

static int parse_inputs (const char **buf, AVFilterInOut **curr_inputs, AVFilterInOut **open_outputs, void *log_ctx)

static int parse_outputs (const char **buf, AVFilterInOut **curr_inputs, AVFilterInOut **open_inputs, AVFilterInOut **open_outputs, void *log_ctx)

static int parse_sws_flags (const char **buf, AVFilterGraph *graph)

int avfilter_graph_parse2 (AVFilterGraph *graph, const char *filters, AVFilterInOut **inputs, AVFilterInOut **outputs)

Add a graph described by a string to a graph.

int avfilter_graph_parse (AVFilterGraph *graph, const char *filters, AVFilterInOut *open_inputs, AVFilterInOut *open_outputs, void *log_ctx)

Add a graph described by a string to a graph.

int avfilter_graph_parse_ptr (AVFilterGraph *graph, const char *filters, AVFilterInOut **open_inputs_ptr, AVFilterInOut **open_outputs_ptr, void *log_ctx)

Add a graph described by a string to a graph.

Macro Definition Documentation

#define WHITESPACES " \n\t"

Definition at line 30 of file graphparser.c.

Referenced by avfilter_graph_parse2(), avfilter_graph_parse_ptr(), parse_inputs(), and parse_outputs().

Function Documentation

static int link_filter ( AVFilterContext * src,

int srcpad,

AVFilterContext * dst,

int dstpad,

void * log_ctx

)

static

Link two filters together.

See Also: avfilter_link()

Definition at line 37 of file graphparser.c.

Referenced by link_filter_inouts(), and parse_outputs().

static char* parse_link_name ( const char ** buf,

void * log_ctx

)

static

Parse the name of a link, which has the format "[linkname]".

Returns: a pointer (that need to be freed after use) to the name between parenthesis

Definition at line 58 of file graphparser.c.

Referenced by parse_inputs(), and parse_outputs().

static int create_filter ( AVFilterContext ** filt_ctx,

AVFilterGraph * ctx,

int index,

const char * filt_name,

const char * args,

void * log_ctx

)

static

Create an instance of a filter, initialize and insert it in the filtergraph in *ctx.

Parameters: filt_ctx put here a filter context in case of successful creation and configuration, NULL otherwise.

ctx the filtergraph context

index an index which is supposed to be unique for each filter instance added to the filtergraph

filt_name the name of the filter to create

args the arguments provided to the filter during its initialization

log_ctx the log context to use

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

Definition at line 94 of file graphparser.c.

Referenced by parse_filter().

static int parse_filter ( AVFilterContext ** filt_ctx,

const char ** buf,

AVFilterGraph * graph,

int index,

void * log_ctx

)

static

Parse a string of the form FILTER_NAME[=PARAMS], and create a corresponding filter instance which is added to graph with create_filter().

Parameters: filt_ctx Pointer that is set to the created and configured filter context on success, set to NULL on failure.

filt_ctx put here a pointer to the created filter context on success, NULL otherwise

buf pointer to the buffer to parse, *buf will be updated to point to the char next after the parsed string

index an index which is assigned to the created filter instance, and which is supposed to be unique for each filter instance added to the filtergraph