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 "internal.h"
#include "formats.h"
#include "video.h"
Include dependency graph for vf_blackframe.c:

Go to the source code of this file.

Data Structures

struct  BlackFrameContext
 

Macros

#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 avfilter_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

Definition at line 93 of file vf_blackframe.c.

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

Definition at line 92 of file vf_blackframe.c.

Function Documentation

AVFILTER_DEFINE_CLASS ( blackframe  )
static int filter_frame ( AVFilterLink inlink,
AVFrame frame 
)
static

Definition at line 62 of file vf_blackframe.c.

static int query_formats ( AVFilterContext ctx)
static

Definition at line 50 of file vf_blackframe.c.

Variable Documentation

AVFilter avfilter_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,
}
static const AVFilterPad outputs[]
Definition: af_ashowinfo.c:117
static const AVFilterPad avfilter_vf_blackframe_inputs[]
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
static const AVFilterPad avfilter_vf_blackframe_outputs[]
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 inputs
static int query_formats(AVFilterContext *ctx)
Definition: vf_blackframe.c:50

Definition at line 124 of file vf_blackframe.c.

const AVFilterPad avfilter_vf_blackframe_inputs[]
static
Initial value:
= {
{
.name = "default",
.get_video_buffer = ff_null_get_video_buffer,
.filter_frame = filter_frame,
},
{ NULL }
}
AVFrame * ff_null_get_video_buffer(AVFilterLink *link, int w, int h)
Definition: video.c:35
NULL
Definition: eval.c:55
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
Definition: vf_blackframe.c:62

Definition at line 106 of file vf_blackframe.c.

const AVFilterPad avfilter_vf_blackframe_outputs[]
static
Initial value:
= {
{
.name = "default",
},
{ NULL }
}
NULL
Definition: eval.c:55

Definition at line 116 of file vf_blackframe.c.

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 },
}
#define FLAGS
Definition: vf_blackframe.c:93
#define OFFSET(x)
Definition: vf_blackframe.c:92
NULL
Definition: eval.c:55

Definition at line 94 of file vf_blackframe.c.