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

#define FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

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,

    .query_formats = query_formats,

    .inputs    = avfilter_vf_blackframe_inputs,

    .outputs   = avfilter_vf_blackframe_outputs,
}

Definition at line 124 of file vf_blackframe.c.

const AVFilterPad avfilter_vf_blackframe_inputs[]

static

Initial value:

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

Definition at line 106 of file vf_blackframe.c.

const AVFilterPad avfilter_vf_blackframe_outputs[]

static

Initial value:

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

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 },
}

Definition at line 94 of file vf_blackframe.c.