vf_cropdetect.c File Reference

#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	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 enum AVPixelFormat	pix_fmts []
static const AVOption	cropdetect_options []
static const AVFilterPad	avfilter_vf_cropdetect_inputs []
static const AVFilterPad	avfilter_vf_cropdetect_outputs []
const 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

SET_META

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

Definition at line 150 of file vf_cropdetect.c.

FIND

#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;\
        }

OFFSET

#define OFFSET

(

x

)

offsetof(CropDetectContext, x)

Definition at line 236 of file vf_cropdetect.c.

FLAGS

#define FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 237 of file vf_cropdetect.c.

Function Documentation

checkline()

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

static

Definition at line 64 of file vf_cropdetect.c.

init()

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 119 of file vf_cropdetect.c.

config_input()

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 131 of file vf_cropdetect.c.

filter_frame()

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

static

Definition at line 153 of file vf_cropdetect.c.

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

cropdetect

)

Variable Documentation

pix_fmts

enum AVPixelFormat pix_fmts[]

static

Initial value:

= {
    AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P,
    AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVJ422P,
    AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P,
    AV_PIX_FMT_YUV411P, AV_PIX_FMT_GRAY8,
    AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV410P,
    AV_PIX_FMT_YUV420P9 , AV_PIX_FMT_YUV422P9 , AV_PIX_FMT_YUV444P9,
    AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
    AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12,
    AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
    AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
    AV_PIX_FMT_NV12,    AV_PIX_FMT_NV21,
    AV_PIX_FMT_RGB24,   AV_PIX_FMT_BGR24,
    AV_PIX_FMT_RGBA,    AV_PIX_FMT_BGRA,
    AV_PIX_FMT_NONE
}

Definition at line 47 of file vf_cropdetect.c.

cropdetect_options

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 },
    { "skip",  "Number of initial frames to skip",                    OFFSET(skip),        AV_OPT_TYPE_INT, { .i64 = 2 },  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 239 of file vf_cropdetect.c.

avfilter_vf_cropdetect_inputs

const AVFilterPad avfilter_vf_cropdetect_inputs[]

static

Initial value:

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

Definition at line 251 of file vf_cropdetect.c.

avfilter_vf_cropdetect_outputs

const AVFilterPad avfilter_vf_cropdetect_outputs[]

static

Initial value:

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

Definition at line 260 of file vf_cropdetect.c.

ff_vf_cropdetect

const 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,
    FILTER_INPUTS(avfilter_vf_cropdetect_inputs),
    FILTER_OUTPUTS(avfilter_vf_cropdetect_outputs),
    FILTER_PIXFMTS_ARRAY(pix_fmts),
    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_METADATA_ONLY,
}

Definition at line 267 of file vf_cropdetect.c.