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

SET_META

#define SET_META	(		key,
			format,
			value
	)

Value:

snprintf(buf, sizeof(buf), format, value);  \
    av_dict_set(metadata, key, buf, 0)

Definition at line 63 of file vf_blackframe.c.

Referenced by filter_frame().

OFFSET

#define OFFSET

(

x

)

offsetof(BlackFrameContext, x)

Definition at line 104 of file vf_blackframe.c.

FLAGS

#define FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 105 of file vf_blackframe.c.

Function Documentation

query_formats()

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 49 of file vf_blackframe.c.

filter_frame()

static int filter_frame ( AVFilterLink *  inlink, AVFrame *  frame  )

static

Definition at line 67 of file vf_blackframe.c.

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

blackframe

)

Variable Documentation

blackframe_options

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 106 of file vf_blackframe.c.

avfilter_vf_blackframe_inputs

const AVFilterPad avfilter_vf_blackframe_inputs[]

static

Initial value:

= {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_VIDEO,
        .filter_frame = filter_frame,
    },
    { NULL }
}

Definition at line 118 of file vf_blackframe.c.

avfilter_vf_blackframe_outputs

const AVFilterPad avfilter_vf_blackframe_outputs[]

static

Initial value:

= {
    {
        .name = "default",
        .type = AVMEDIA_TYPE_VIDEO
    },
    { NULL }
}

Definition at line 127 of file vf_blackframe.c.

ff_vf_blackframe

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,
    .query_formats = query_formats,
    .inputs        = avfilter_vf_blackframe_inputs,
    .outputs       = avfilter_vf_blackframe_outputs,
}

Definition at line 135 of file vf_blackframe.c.