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avfilter/vf_cropdetect: adjust Default threshold based on bit depth 

Also allow specifying thresholds that are bit depth independant

Previous version reviewed by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-12-30 21:02:34 +01:00
parent 081567397e
commit a288d08d84
1 changed files with 10 additions and 6 deletions
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16
libavfilter/vf_cropdetect.c
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@ -35,7 +35,7 @@
typedef struct CropDetectContext {
const AVClass *class;
int x1, y1, x2, y2;
int limit;
float limit;
int round;
int reset_count;
int frame_nb;
@ -127,7 +127,7 @@ static av_cold int init(AVFilterContext *ctx)
s->frame_nb = -2;
av_log(ctx, AV_LOG_VERBOSE, "limit:%d round:%d reset_count:%d\n",
av_log(ctx, AV_LOG_VERBOSE, "limit:%f round:%d reset_count:%d\n",
s->limit, s->round, s->reset_count);
return 0;
@ -137,9 +137,12 @@ static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
CropDetectContext *s = ctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
av_image_fill_max_pixsteps(s->max_pixsteps, NULL,
av_pix_fmt_desc_get(inlink->format));
av_image_fill_max_pixsteps(s->max_pixsteps, NULL, desc);
if (s->limit < 1.0)
s->limit *= (1 << (desc->comp[0].depth_minus1 + 1)) - 1;
s->x1 = inlink->w - 1;
s->y1 = inlink->h - 1;
@ -160,6 +163,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
int w, h, x, y, shrink_by;
AVDictionary **metadata;
int outliers, last_y;
int limit = round(s->limit);
// ignore first 2 frames - they may be empty
if (++s->frame_nb > 0) {
@ -177,7 +181,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
#define FIND(DST, FROM, NOEND, INC, STEP0, STEP1, LEN) \
outliers = 0;\
for (last_y = y = FROM; NOEND; y = y INC) {\
if (checkline(ctx, frame->data[0] + STEP0 * y, STEP1, LEN, bpp) > s->limit) {\
if (checkline(ctx, frame->data[0] + STEP0 * y, STEP1, LEN, bpp) > limit) {\
if (++outliers > s->max_outliers) { \
DST = last_y;\
break;\
@ -238,7 +242,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption cropdetect_options[] = {
{ "limit", "Threshold below which the pixel is considered black", OFFSET(limit), AV_OPT_TYPE_INT, { .i64 = 24 }, 0, 65535, FLAGS },
{ "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 },