vf_blackframe.c File Reference

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

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

Go to the source code of this file.

Data Structures
struct	BlackFrameContext
struct	ThreadData
	Used for passing data between threads. More...

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

Functions
static int	blackframe_slice (AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
static int	filter_frame (AVFilterLink *inlink, AVFrame *frame)
	AVFILTER_DEFINE_CLASS (blackframe)

Variables
static enum AVPixelFormat	pix_fmts []
static const AVOption	blackframe_options []
static const AVFilterPad	avfilter_vf_blackframe_inputs []
const FFFilter	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 64 of file vf_blackframe.c.

Referenced by filter_frame().

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(BlackFrameContext, x)

Definition at line 130 of file vf_blackframe.c.

FLAGS

#define FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 131 of file vf_blackframe.c.

Function Documentation

blackframe_slice()

static int blackframe_slice ( AVFilterContext * ctx, void * arg, int jobnr, int nb_jobs )

static

Definition at line 68 of file vf_blackframe.c.

Referenced by filter_frame().

filter_frame()

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

static

Definition at line 88 of file vf_blackframe.c.

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

blackframe

)

Variable Documentation

pix_fmts

enum AVPixelFormat pix_fmts[]

static

Initial value:

= {
    AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NV12,
    AV_PIX_FMT_NV21, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV411P,
    AV_PIX_FMT_NONE
}

Definition at line 58 of file vf_blackframe.c.

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 132 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,
    },
}

Definition at line 144 of file vf_blackframe.c.

ff_vf_blackframe

const FFFilter ff_vf_blackframe

Initial value:

= {
    .p.name        = "blackframe",
    .p.description = NULL_IF_CONFIG_SMALL("Detect frames that are (almost) black."),
    .p.priv_class  = &blackframe_class,
    .p.flags       = AVFILTER_FLAG_METADATA_ONLY | AVFILTER_FLAG_SLICE_THREADS,
    .priv_size     = sizeof(BlackFrameContext),
    FILTER_INPUTS(avfilter_vf_blackframe_inputs),
    FILTER_OUTPUTS(ff_video_default_filterpad),
    FILTER_PIXFMTS_ARRAY(pix_fmts),
}

Definition at line 152 of file vf_blackframe.c.