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	YUVJ_FORMATS   PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ444P, PIX_FMT_YUVJ440P
Functions
static const char *	blackdetect_get_name (void *ctx)
static int	query_formats (AVFilterContext *ctx)
static av_cold int	init (AVFilterContext *ctx, const char *args, void *opaque)
static int	config_input (AVFilterLink *inlink)
static void	draw_slice (AVFilterLink *inlink, int y, int h, int slice_dir)
static void	end_frame (AVFilterLink *inlink)
Variables
static const AVOption	blackdetect_options []
static const AVClass	blackdetect_class
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 OFFSET

(

x

)

offsetof(BlackDetectContext, x)

Definition at line 49 of file vf_blackdetect.c.

#define YUVJ_FORMATS   PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ444P, PIX_FMT_YUVJ440P

Definition at line 71 of file vf_blackdetect.c.

Referenced by query_formats().

---

Function Documentation

static const char* blackdetect_get_name

(

void *

ctx

)

[static]

Definition at line 60 of file vf_blackdetect.c.

static int config_input

(

AVFilterLink *

inlink

)

[static]

Definition at line 107 of file vf_blackdetect.c.

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

Definition at line 128 of file vf_blackdetect.c.

static void end_frame

(

AVFilterLink *

inlink

)

[static]

Definition at line 145 of file vf_blackdetect.c.

static av_cold int init	(	AVFilterContext *	ctx,
		const char *	args,
		void *	opaque
	)			[static]

Definition at line 91 of file vf_blackdetect.c.

static int query_formats

(

AVFilterContext *

ctx

)

[static]

Definition at line 78 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 = avfilter_null_get_video_buffer,
          .start_frame      = ff_null_start_frame_keep_ref,
          .end_frame        = end_frame, },
        { .name = NULL }
    },

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

Definition at line 187 of file vf_blackdetect.c.

const AVClass blackdetect_class [static]

Initial value:

 {
    .class_name = "BlackDetectContext",
    .item_name  = blackdetect_get_name,
    .option     = blackdetect_options,
}

Definition at line 65 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},
    { "black_min_duration", "set minimum detected black duration in seconds", OFFSET(black_min_duration_time), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 0, DBL_MAX},
    { "picture_black_ratio_th", "set the picture black ratio threshold", OFFSET(picture_black_ratio_th), AV_OPT_TYPE_DOUBLE, {.dbl=.98}, 0, 1},
    { "pic_th",                 "set the picture black ratio threshold", OFFSET(picture_black_ratio_th), AV_OPT_TYPE_DOUBLE, {.dbl=.98}, 0, 1},
    { "pixel_black_th", "set the pixel black threshold", OFFSET(pixel_black_th), AV_OPT_TYPE_DOUBLE, {.dbl=.10}, 0, 1},
    { "pix_th",         "set the pixel black threshold", OFFSET(pixel_black_th), AV_OPT_TYPE_DOUBLE, {.dbl=.10}, 0, 1},
    { NULL },
}

Definition at line 50 of file vf_blackdetect.c.

enum PixelFormat yuvj_formats[] [static]

Initial value:

 {
    YUVJ_FORMATS, PIX_FMT_NONE
}

Definition at line 74 of file vf_blackdetect.c.

Referenced by config_input().