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lavfi/bbox: make min_val user configurable

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Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2013-05-26 09:22:02 +00:00
parent e9c3851d60
commit 7aa99a69c7
3 changed files with 23 additions and 3 deletions
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7
doc/filters.texi
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@ -1925,6 +1925,13 @@ luminance value greater than the minimum allowed value.
The parameters describing the bounding box are printed on the filter
log.
The filter accepts the following option:
@table @option
@item min_val
Set the minimal luminance value. Default is @code{16}.
@end table
@section blackdetect
Detect video intervals that are (almost) completely black. Can be

2
libavfilter/version.h
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@ -31,7 +31,7 @@
#define LIBAVFILTER_VERSION_MAJOR 3
#define LIBAVFILTER_VERSION_MINOR 70
#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_MICRO 101
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \

17
libavfilter/vf_bbox.c
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@ -23,6 +23,7 @@
* bounding box detection filter
*/
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/timestamp.h"
#include "avfilter.h"
@ -30,9 +31,20 @@
#include "internal.h"
typedef struct {
int unused;
const AVClass *class;
int min_val;
} BBoxContext;
#define OFFSET(x) offsetof(BBoxContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption bbox_options[] = {
{ "min_val", "set minimum luminance value for bounding box", OFFSET(min_val), AV_OPT_TYPE_INT, { .i64 = 16 }, 0, 254, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(bbox);
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
@ -58,7 +70,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
has_bbox =
ff_calculate_bounding_box(&box,
frame->data[0], frame->linesize[0],
inlink->w, inlink->h, 16);
inlink->w, inlink->h, bbox->min_val);
w = box.x2 - box.x1 + 1;
h = box.y2 - box.y1 + 1;
@ -100,6 +112,7 @@ AVFilter avfilter_vf_bbox = {
.name = "bbox",
.description = NULL_IF_CONFIG_SMALL("Compute bounding box for each frame."),
.priv_size = sizeof(BBoxContext),
.priv_class = &bbox_class,
.query_formats = query_formats,
.inputs = bbox_inputs,
.outputs = bbox_outputs,