graphparser.c File Reference
#include <ctype.h>
#include <string.h>
#include "libavutil/avstring.h"
#include "avfilter.h"
#include "avfiltergraph.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().
static void free_inout (AVFilterInOut *head)
static AVFilterInOutextract_inout (const char *label, AVFilterInOut **links)
static void insert_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)
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.

Macro Definition Documentation

#define WHITESPACES   " \n\t"

Definition at line 30 of file graphparser.c.

Referenced by avfilter_graph_parse(), parse_inputs(), and parse_outputs().

Function Documentation

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
graphthe filter graph where to link the parsed graph context
filtersstring to be parsed
inputslinked list to the inputs of the graph
outputslinked list to the outputs of the graph
Returns
zero on success, a negative AVERROR code on error

Definition at line 333 of file graphparser.c.

Referenced by main().

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_ctxput here a filter context in case of successful creation and configuration, NULL otherwise.
ctxthe filtergraph context
indexan index which is supposed to be unique for each filter instance added to the filtergraph
filt_namethe name of the filter to create
argsthe arguments provided to the filter during its initialization
log_ctxthe 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 AVFilterInOut* extract_inout ( const char *  label,
AVFilterInOut **  links 
)
static

Definition at line 184 of file graphparser.c.

Referenced by parse_inputs(), and parse_outputs().

static void free_inout ( AVFilterInOut head)
static

Definition at line 174 of file graphparser.c.

Referenced by avfilter_graph_parse().

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

Definition at line 199 of file graphparser.c.

Referenced by link_filter_inouts(), parse_inputs(), and parse_outputs().

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

Definition at line 205 of file graphparser.c.

Referenced by avfilter_graph_parse().

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_ctxPointer that is set to the created and configured filter context on success, set to NULL on failure.
filt_ctxput here a pointer to the created filter context on success, NULL otherwise
bufpointer to the buffer to parse, *buf will be updated to point to the char next after the parsed string
indexan index which is assigned to the created filter instance, and which is supposed to be unique for each filter instance added to the filtergraph
Returns
0 in case of success, a negative AVERROR code otherwise

Definition at line 156 of file graphparser.c.

Referenced by avfilter_graph_parse().

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

Definition at line 254 of file graphparser.c.

Referenced by avfilter_graph_parse().

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

Definition at line 288 of file graphparser.c.

Referenced by avfilter_graph_parse().