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/*
* Copyright (c) 2012 Stefano Sabatini
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* bounding box detection filter
*/
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/timestamp.h"
#include "avfilter.h"
#include "bbox.h"
#include "internal.h"
typedef struct {
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[] = {
AV_PIX_FMT_YUV420P,
AV_PIX_FMT_YUV444P,
AV_PIX_FMT_YUV440P,
AV_PIX_FMT_YUV422P,
AV_PIX_FMT_YUV411P,
AV_PIX_FMT_NONE,
};
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
return 0;
}
#define SET_META(key, value) \
snprintf(buf, sizeof(buf), "%d", value); \
av_dict_set(metadata, #key, buf, 0); \
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
AVFilterContext *ctx = inlink->dst;
BBoxContext *bbox = ctx->priv;
FFBoundingBox box;
int has_bbox, w, h;
char buf[32];
has_bbox =
ff_calculate_bounding_box(&box,
frame->data[0], frame->linesize[0],
inlink->w, inlink->h, bbox->min_val);
w = box.x2 - box.x1 + 1;
h = box.y2 - box.y1 + 1;
av_log(ctx, AV_LOG_INFO,
"n:%"PRId64" pts:%s pts_time:%s", inlink->frame_count,
av_ts2str(frame->pts), av_ts2timestr(frame->pts, &inlink->time_base));
if (has_bbox) {
AVDictionary **metadata = avpriv_frame_get_metadatap(frame);
SET_META("lavfi.bbox.x1", box.x1)
SET_META("lavfi.bbox.x2", box.x2)
SET_META("lavfi.bbox.y1", box.y1)
SET_META("lavfi.bbox.y2", box.y2)
SET_META("lavfi.bbox.w", w)
SET_META("lavfi.bbox.h", h)
av_log(ctx, AV_LOG_INFO,
" x1:%d x2:%d y1:%d y2:%d w:%d h:%d"
" crop=%d:%d:%d:%d drawbox=%d:%d:%d:%d",
box.x1, box.x2, box.y1, box.y2, w, h,
w, h, box.x1, box.y1, /* crop params */
box.x1, box.y1, w, h); /* drawbox params */
}
av_log(ctx, AV_LOG_INFO, "\n");
return ff_filter_frame(inlink->dst->outputs[0], frame);
}
static const AVFilterPad bbox_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad bbox_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
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,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};
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