libavfilter/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
Defines
#define	OFFSET(x)   offsetof(BlackDetectContext, x)
#define	FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define	YUVJ_FORMATS   PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ444P, 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	draw_slice (AVFilterLink *inlink, int y, int h, int slice_dir)
static int	end_frame (AVFilterLink *inlink)
Variables
static const AVOption	blackdetect_options []
static enum PixelFormat	yuvj_formats []
AVFilter	avfilter_vf_blackdetect

---

Detailed Description

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

Definition in file vf_blackdetect.c.

---

Define Documentation

#define FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 51 of file vf_blackdetect.c.

#define OFFSET

(

x

)

offsetof(BlackDetectContext, x)

Definition at line 50 of file vf_blackdetect.c.

#define YUVJ_FORMATS   PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ444P, PIX_FMT_YUVJ440P

Definition at line 65 of file vf_blackdetect.c.

Referenced by query_formats().

---

Function Documentation

AVFILTER_DEFINE_CLASS

(

blackdetect

)

static void check_black_end

(

AVFilterContext *

ctx

)

[static]

Definition at line 120 of file vf_blackdetect.c.

Referenced by end_frame(), and request_frame().

static int config_input

(

AVFilterLink *

inlink

)

[static]

Definition at line 99 of file vf_blackdetect.c.

static int draw_slice	(	AVFilterLink *	inlink,
		int	y,
		int	h,
		int	slice_dir
	)			[static]

Definition at line 149 of file vf_blackdetect.c.

static int end_frame

(

AVFilterLink *

inlink

)

[static]

Definition at line 166 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 query_formats

(

AVFilterContext *

ctx

)

[static]

Definition at line 72 of file vf_blackdetect.c.

static int request_frame

(

AVFilterLink *

outlink

)

[static]

Definition at line 134 of file vf_blackdetect.c.

---

Variable Documentation

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 = (const AVFilterPad[]) {
        { .name             = "default",
          .type             = AVMEDIA_TYPE_VIDEO,
          .config_props     = config_input,
          .draw_slice       = draw_slice,
          .get_video_buffer = ff_null_get_video_buffer,
          .start_frame      = ff_null_start_frame,
          .end_frame        = end_frame, },
        { .name = NULL }
    },

    .outputs = (const AVFilterPad[]) {
        { .name             = "default",
          .type             = AVMEDIA_TYPE_VIDEO,
          .request_frame    = request_frame, },
        { .name = NULL }
    },
    .priv_class = &blackdetect_class,
}

Definition at line 200 of file vf_blackdetect.c.

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 PixelFormat yuvj_formats[] [static]

Initial value:

 {
    YUVJ_FORMATS, PIX_FMT_NONE
}

Definition at line 68 of file vf_blackdetect.c.

Referenced by config_input().