vf_cropdetect.c File Reference

border detection filter Ported from MPlayer libmpcodecs/vf_cropdetect.c. More...

#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"

Go to the source code of this file.

Data Structures
struct	CropDetectContext

Macros
#define	SET_META(key, value)   av_dict_set_int(metadata, key, value, 0)
#define	FIND(DST, FROM, NOEND, INC, STEP0, STEP1, LEN)
#define	OFFSET(x)   offsetof(CropDetectContext, x)
#define	FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Functions
static int	query_formats (AVFilterContext *ctx)
static int	checkline (void *ctx, const unsigned char *src, int stride, int len, int bpp)
static av_cold int	init (AVFilterContext *ctx)
static int	config_input (AVFilterLink *inlink)
static int	filter_frame (AVFilterLink *inlink, AVFrame *frame)
	AVFILTER_DEFINE_CLASS (cropdetect)

Variables
static const AVOption	cropdetect_options []
static const AVFilterPad	avfilter_vf_cropdetect_inputs []
static const AVFilterPad	avfilter_vf_cropdetect_outputs []
AVFilter	ff_vf_cropdetect

Detailed Description

border detection filter Ported from MPlayer libmpcodecs/vf_cropdetect.c.

Definition in file vf_cropdetect.c.

Macro Definition Documentation

#define SET_META	(		key,
			value
	)		av_dict_set_int(metadata, key, value, 0)

Definition at line 155 of file vf_cropdetect.c.

Referenced by filter_frame().

#define FIND	(		DST,
			FROM,
			NOEND,
			INC,
			STEP0,
			STEP1,
			LEN
	)

Value:

outliers = 0;\
        for (last_y = y = FROM; NOEND; y = y INC) {\
            if (checkline(ctx, frame->data[0] + STEP0 * y, STEP1, LEN, bpp) > limit) {\
                if (++outliers > s->max_outliers) { \
                    DST = last_y;\
                    break;\
                }\
            } else\
                last_y = y INC;\
        }

Referenced by filter_frame().

#define OFFSET

(

x

)

offsetof(CropDetectContext, x)

Definition at line 241 of file vf_cropdetect.c.

#define FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 242 of file vf_cropdetect.c.

Function Documentation

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 46 of file vf_cropdetect.c.

static int checkline ( void *  ctx, const unsigned char *  src, int  stride, int  len, int  bpp  )

static

Definition at line 69 of file vf_cropdetect.c.

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 124 of file vf_cropdetect.c.

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 136 of file vf_cropdetect.c.

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

static

Definition at line 158 of file vf_cropdetect.c.

AVFILTER_DEFINE_CLASS

(

cropdetect

)

Variable Documentation

const AVOption cropdetect_options[]

static

Initial value:

= {
    { "limit", "Threshold below which the pixel is considered black", OFFSET(limit),       AV_OPT_TYPE_FLOAT, { .dbl = 24.0/255 }, 0, 65535, FLAGS },
    { "round", "Value by which the width/height should be divisible", OFFSET(round),       AV_OPT_TYPE_INT, { .i64 = 16 }, 0, INT_MAX, FLAGS },
    { "reset", "Recalculate the crop area after this many frames",    OFFSET(reset_count), AV_OPT_TYPE_INT, { .i64 = 0 },  0, INT_MAX, FLAGS },
    { "reset_count", "Recalculate the crop area after this many frames",OFFSET(reset_count),AV_OPT_TYPE_INT,{ .i64 = 0 },  0, INT_MAX, FLAGS },
    { "max_outliers", "Threshold count of outliers",                  OFFSET(max_outliers),AV_OPT_TYPE_INT, { .i64 = 0 },  0, INT_MAX, FLAGS },
    { NULL }
}

Definition at line 244 of file vf_cropdetect.c.

const AVFilterPad avfilter_vf_cropdetect_inputs[]

static

Initial value:

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

Definition at line 255 of file vf_cropdetect.c.

const AVFilterPad avfilter_vf_cropdetect_outputs[]

static

Initial value:

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

Definition at line 265 of file vf_cropdetect.c.

AVFilter ff_vf_cropdetect

Initial value:

= {
    .name          = "cropdetect",
    .description   = NULL_IF_CONFIG_SMALL("Auto-detect crop size."),
    .priv_size     = sizeof(CropDetectContext),
    .priv_class    = &cropdetect_class,
    .init          = init,
    .query_formats = query_formats,
    .inputs        = avfilter_vf_cropdetect_inputs,
    .outputs       = avfilter_vf_cropdetect_outputs,
    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
}

Definition at line 273 of file vf_cropdetect.c.