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avfilter/vf_cropdetect: add max_outliers parameter 

Fixes Ticket3030

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-12-27 04:27:07 +01:00
parent 627f5658b6
commit 3b1f747238
1 changed files with 15 additions and 8 deletions
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23
libavfilter/vf_cropdetect.c
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@ -40,6 +40,7 @@ typedef struct CropDetectContext {
int reset_count;
int frame_nb;
int max_pixsteps[4];
int max_outliers;
} CropDetectContext;
static int query_formats(AVFilterContext *ctx)
@ -123,6 +124,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
int bpp = s->max_pixsteps[0];
int w, h, x, y, shrink_by;
AVDictionary **metadata;
int outliers, last_y;
// ignore first 2 frames - they may be empty
if (++s->frame_nb > 0) {
@ -138,17 +140,21 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
}
#define FIND(DST, FROM, NOEND, INC, STEP0, STEP1, LEN) \
for (y = FROM; NOEND; INC) {\
outliers = 0;\
for (last_y = y = FROM; NOEND; y = y INC) {\
if (checkline(ctx, frame->data[0] + STEP0 * y, STEP1, LEN, bpp) > s->limit) {\
DST = y;\
break;\
}\
if (++outliers > s->max_outliers) { \
DST = last_y;\
break;\
}\
} else\
last_y = y INC;\
}
FIND(s->y1, 0, y < s->y1, y++, frame->linesize[0], bpp, frame->width);
FIND(s->y2, frame->height - 1, y > FFMAX(s->y2, s->y1), y--, frame->linesize[0], bpp, frame->width);
FIND(s->x1, 0, y < s->x1, y++, bpp, frame->linesize[0], frame->height);
FIND(s->x2, frame->width - 1, y > FFMAX(s->x2, s->x1), y--, bpp, frame->linesize[0], frame->height);
FIND(s->y1, 0, y < s->y1, +1, frame->linesize[0], bpp, frame->width);
FIND(s->y2, frame->height - 1, y > FFMAX(s->y2, s->y1), -1, frame->linesize[0], bpp, frame->width);
FIND(s->x1, 0, y < s->x1, +1, bpp, frame->linesize[0], frame->height);
FIND(s->x2, frame->width - 1, y > FFMAX(s->x2, s->x1), -1, bpp, frame->linesize[0], frame->height);
// round x and y (up), important for yuv colorspaces
@ -201,6 +207,7 @@ static const AVOption cropdetect_options[] = {
{ "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 }
};