135 lines
3.9 KiB
C
135 lines
3.9 KiB
C
/*
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* Copyright (c) 2012 Stefano Sabatini
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* bounding box detection filter
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*/
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/timestamp.h"
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#include "avfilter.h"
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#include "bbox.h"
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#include "internal.h"
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typedef struct {
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const AVClass *class;
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int min_val;
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} BBoxContext;
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#define OFFSET(x) offsetof(BBoxContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption bbox_options[] = {
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{ "min_val", "set minimum luminance value for bounding box", OFFSET(min_val), AV_OPT_TYPE_INT, { .i64 = 16 }, 0, 254, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(bbox);
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_YUV420P,
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AV_PIX_FMT_YUV444P,
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AV_PIX_FMT_YUV440P,
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AV_PIX_FMT_YUV422P,
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AV_PIX_FMT_YUV411P,
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AV_PIX_FMT_NONE,
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};
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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return 0;
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}
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#define SET_META(key, value) \
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snprintf(buf, sizeof(buf), "%d", value); \
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av_dict_set(metadata, #key, buf, 0); \
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static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
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{
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AVFilterContext *ctx = inlink->dst;
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BBoxContext *bbox = ctx->priv;
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FFBoundingBox box;
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int has_bbox, w, h;
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char buf[32];
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has_bbox =
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ff_calculate_bounding_box(&box,
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frame->data[0], frame->linesize[0],
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inlink->w, inlink->h, bbox->min_val);
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w = box.x2 - box.x1 + 1;
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h = box.y2 - box.y1 + 1;
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av_log(ctx, AV_LOG_INFO,
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"n:%"PRId64" pts:%s pts_time:%s", inlink->frame_count,
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av_ts2str(frame->pts), av_ts2timestr(frame->pts, &inlink->time_base));
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if (has_bbox) {
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AVDictionary **metadata = avpriv_frame_get_metadatap(frame);
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SET_META("lavfi.bbox.x1", box.x1)
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SET_META("lavfi.bbox.x2", box.x2)
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SET_META("lavfi.bbox.y1", box.y1)
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SET_META("lavfi.bbox.y2", box.y2)
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SET_META("lavfi.bbox.w", w)
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SET_META("lavfi.bbox.h", h)
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av_log(ctx, AV_LOG_INFO,
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" x1:%d x2:%d y1:%d y2:%d w:%d h:%d"
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" crop=%d:%d:%d:%d drawbox=%d:%d:%d:%d",
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box.x1, box.x2, box.y1, box.y2, w, h,
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w, h, box.x1, box.y1, /* crop params */
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box.x1, box.y1, w, h); /* drawbox params */
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}
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av_log(ctx, AV_LOG_INFO, "\n");
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return ff_filter_frame(inlink->dst->outputs[0], frame);
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}
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static const AVFilterPad bbox_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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},
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{ NULL }
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};
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static const AVFilterPad bbox_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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AVFilter avfilter_vf_bbox = {
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.name = "bbox",
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.description = NULL_IF_CONFIG_SMALL("Compute bounding box for each frame."),
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.priv_size = sizeof(BBoxContext),
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.priv_class = &bbox_class,
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.query_formats = query_formats,
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.inputs = bbox_inputs,
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.outputs = bbox_outputs,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
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};
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