FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
Data Structures | Macros | Functions | Variables
vf_blackframe.c File Reference

Search for black frames to detect scene transitions. More...

#include <stdio.h>
#include <inttypes.h>
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"

Go to the source code of this file.

Data Structures

struct  BlackFrameContext
 

Macros

#define SET_META(key, format, value)
 
#define OFFSET(x)   offsetof(BlackFrameContext, x)
 
#define FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
 

Functions

static int query_formats (AVFilterContext *ctx)
 
static int filter_frame (AVFilterLink *inlink, AVFrame *frame)
 
 AVFILTER_DEFINE_CLASS (blackframe)
 

Variables

static const AVOption blackframe_options []
 
static const AVFilterPad avfilter_vf_blackframe_inputs []
 
static const AVFilterPad avfilter_vf_blackframe_outputs []
 
AVFilter ff_vf_blackframe
 

Detailed Description

Search for black frames to detect scene transitions.

Ported from MPlayer libmpcodecs/vf_blackframe.c.

Definition in file vf_blackframe.c.

Macro Definition Documentation

#define SET_META (   key,
  format,
  value 
)
Value:
snprintf(buf, sizeof(buf), format, value); \
av_dict_set(metadata, key, buf, 0)

Definition at line 61 of file vf_blackframe.c.

Referenced by filter_frame().

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

Definition at line 102 of file vf_blackframe.c.

Definition at line 103 of file vf_blackframe.c.

Function Documentation

static int query_formats ( AVFilterContext ctx)
static

Definition at line 49 of file vf_blackframe.c.

static int filter_frame ( AVFilterLink inlink,
AVFrame frame 
)
static

Definition at line 65 of file vf_blackframe.c.

AVFILTER_DEFINE_CLASS ( blackframe  )

Variable Documentation

const AVOption blackframe_options[]
static
Initial value:
= {
{ "amount", "Percentage of the pixels that have to be below the threshold "
"for the frame to be considered black.", OFFSET(bamount), AV_OPT_TYPE_INT, { .i64 = 98 }, 0, 100, FLAGS },
{ "threshold", "threshold below which a pixel value is considered black",
OFFSET(bthresh), AV_OPT_TYPE_INT, { .i64 = 32 }, 0, 255, FLAGS },
{ "thresh", "threshold below which a pixel value is considered black",
OFFSET(bthresh), AV_OPT_TYPE_INT, { .i64 = 32 }, 0, 255, FLAGS },
{ NULL }
}

Definition at line 104 of file vf_blackframe.c.

const AVFilterPad avfilter_vf_blackframe_inputs[]
static
Initial value:
= {
{
.name = "default",
.filter_frame = filter_frame,
},
{ NULL }
}

Definition at line 116 of file vf_blackframe.c.

const AVFilterPad avfilter_vf_blackframe_outputs[]
static
Initial value:
= {
{
.name = "default",
},
{ NULL }
}

Definition at line 125 of file vf_blackframe.c.

AVFilter ff_vf_blackframe
Initial value:
= {
.name = "blackframe",
.description = NULL_IF_CONFIG_SMALL("Detect frames that are (almost) black."),
.priv_size = sizeof(BlackFrameContext),
.priv_class = &blackframe_class,
}

Definition at line 133 of file vf_blackframe.c.