FFmpeg  4.0
Data Structures | Macros | Functions | Variables
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

◆ SET_META

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

Definition at line 157 of file vf_cropdetect.c.

Referenced by filter_frame().

◆ 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;\
}
const char * s
Definition: avisynth_c.h:768
static AVFrame * frame
AVFormatContext * ctx
Definition: movenc.c:48
#define LEN
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:232
static int checkline(void *ctx, const unsigned char *src, int stride, int len, int bpp)
Definition: vf_cropdetect.c:71

Referenced by filter_frame().

◆ OFFSET

#define OFFSET (   x)    offsetof(CropDetectContext, x)

Definition at line 243 of file vf_cropdetect.c.

◆ FLAGS

Definition at line 244 of file vf_cropdetect.c.

Function Documentation

◆ query_formats()

static int query_formats ( AVFilterContext ctx)
static

Definition at line 46 of file vf_cropdetect.c.

◆ checkline()

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

Definition at line 71 of file vf_cropdetect.c.

◆ init()

static av_cold int init ( AVFilterContext ctx)
static

Definition at line 126 of file vf_cropdetect.c.

◆ config_input()

static int config_input ( AVFilterLink inlink)
static

Definition at line 138 of file vf_cropdetect.c.

◆ filter_frame()

static int filter_frame ( AVFilterLink inlink,
AVFrame frame 
)
static

Definition at line 160 of file vf_cropdetect.c.

◆ AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS ( cropdetect  )

Variable Documentation

◆ 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 },
{ "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 }
}
#define NULL
Definition: coverity.c:32
static av_always_inline av_const double round(double x)
Definition: libm.h:444
#define FLAGS
#define OFFSET(x)

Definition at line 246 of file vf_cropdetect.c.

◆ avfilter_vf_cropdetect_inputs

const AVFilterPad avfilter_vf_cropdetect_inputs[]
static
Initial value:
= {
{
.name = "default",
.config_props = config_input,
.filter_frame = filter_frame,
},
{ NULL }
}
#define NULL
Definition: coverity.c:32
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
static int config_input(AVFilterLink *inlink)

Definition at line 257 of file vf_cropdetect.c.

◆ avfilter_vf_cropdetect_outputs

const AVFilterPad avfilter_vf_cropdetect_outputs[]
static
Initial value:
= {
{
.name = "default",
},
{ NULL }
}
#define NULL
Definition: coverity.c:32

Definition at line 267 of file vf_cropdetect.c.

◆ ff_vf_cropdetect

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,
}
#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
Some filters support a generic "enable" expression option that can be used to enable or disable a fil...
Definition: avfilter.h:125
static av_cold int init(AVFilterContext *ctx)
static int flags
Definition: log.c:55
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
static const AVFilterPad inputs[]
Definition: af_acontrast.c:193
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
static int query_formats(AVFilterContext *ctx)
Definition: vf_cropdetect.c:46
static const AVFilterPad avfilter_vf_cropdetect_inputs[]
static const AVFilterPad avfilter_vf_cropdetect_outputs[]

Definition at line 275 of file vf_cropdetect.c.