vf_blackdetect.c File Reference

Video black detector, loosely based on blackframe with extended syntax and features. More...

#include <float.h>
#include "libavutil/opt.h"
#include "libavutil/timestamp.h"
#include "avfilter.h"
#include "internal.h"

Go to the source code of this file.

Data Structures
struct	BlackDetectContext

Macros
#define	OFFSET(x)   offsetof(BlackDetectContext, x)
#define	FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define	YUVJ_FORMATS   AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P

Functions
	AVFILTER_DEFINE_CLASS (blackdetect)
static int	query_formats (AVFilterContext *ctx)
static av_cold int	init (AVFilterContext *ctx, const char *args)
static int	config_input (AVFilterLink *inlink)
static void	check_black_end (AVFilterContext *ctx)
static int	request_frame (AVFilterLink *outlink)
static int	filter_frame (AVFilterLink *inlink, AVFilterBufferRef *picref)

Variables
static const AVOption	blackdetect_options []
static enum AVPixelFormat	yuvj_formats []
static const AVFilterPad	blackdetect_inputs []
static const AVFilterPad	blackdetect_outputs []
AVFilter	avfilter_vf_blackdetect

Detailed Description

Video black detector, loosely based on blackframe with extended syntax and features.

Definition in file vf_blackdetect.c.

Macro Definition Documentation

#define OFFSET

(

x

)

offsetof(BlackDetectContext, x)

Definition at line 50 of file vf_blackdetect.c.

#define FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 51 of file vf_blackdetect.c.

#define YUVJ_FORMATS   AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P

Definition at line 65 of file vf_blackdetect.c.

Referenced by query_formats().

Function Documentation

AVFILTER_DEFINE_CLASS

(

blackdetect

)

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 72 of file vf_blackdetect.c.

static av_cold int init ( AVFilterContext *  ctx, const char *  args  )

static

Definition at line 85 of file vf_blackdetect.c.

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 99 of file vf_blackdetect.c.

static void check_black_end ( AVFilterContext *  ctx )

static

Definition at line 120 of file vf_blackdetect.c.

Referenced by filter_frame(), and request_frame().

static int request_frame ( AVFilterLink *  outlink )

static

Definition at line 134 of file vf_blackdetect.c.

static int filter_frame ( AVFilterLink *  inlink, AVFilterBufferRef *  picref  )

static

Definition at line 149 of file vf_blackdetect.c.

Variable Documentation

const AVOption blackdetect_options[]

static

Initial value:

= {
    { "d",                  "set minimum detected black duration in seconds", OFFSET(black_min_duration_time), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 0, DBL_MAX, FLAGS },
    { "black_min_duration", "set minimum detected black duration in seconds", OFFSET(black_min_duration_time), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 0, DBL_MAX, FLAGS },
    { "picture_black_ratio_th", "set the picture black ratio threshold", OFFSET(picture_black_ratio_th), AV_OPT_TYPE_DOUBLE, {.dbl=.98}, 0, 1, FLAGS },
    { "pic_th",                 "set the picture black ratio threshold", OFFSET(picture_black_ratio_th), AV_OPT_TYPE_DOUBLE, {.dbl=.98}, 0, 1, FLAGS },
    { "pixel_black_th", "set the pixel black threshold", OFFSET(pixel_black_th), AV_OPT_TYPE_DOUBLE, {.dbl=.10}, 0, 1, FLAGS },
    { "pix_th",         "set the pixel black threshold", OFFSET(pixel_black_th), AV_OPT_TYPE_DOUBLE, {.dbl=.10}, 0, 1, FLAGS },
    { NULL },
}

Definition at line 53 of file vf_blackdetect.c.

enum AVPixelFormat yuvj_formats[]

static

Initial value:

= {
    YUVJ_FORMATS, AV_PIX_FMT_NONE
}

Definition at line 68 of file vf_blackdetect.c.

Referenced by config_input().

const AVFilterPad blackdetect_inputs[]

static

Initial value:

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

Definition at line 190 of file vf_blackdetect.c.

const AVFilterPad blackdetect_outputs[]

static

Initial value:

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

Definition at line 201 of file vf_blackdetect.c.

AVFilter avfilter_vf_blackdetect

Initial value:

= {
    .name          = "blackdetect",
    .description   = NULL_IF_CONFIG_SMALL("Detect video intervals that are (almost) black."),
    .priv_size     = sizeof(BlackDetectContext),
    .init          = init,
    .query_formats = query_formats,
    .inputs        = blackdetect_inputs,
    .outputs       = blackdetect_outputs,
    .priv_class    = &blackdetect_class,
}

Definition at line 210 of file vf_blackdetect.c.