diff options
Diffstat (limited to 'libavfilter/vf_bbox.c')
| -rw-r--r-- | libavfilter/vf_bbox.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/libavfilter/vf_bbox.c b/libavfilter/vf_bbox.c new file mode 100644 index 0000000000..6c6aab140e --- /dev/null +++ b/libavfilter/vf_bbox.c @@ -0,0 +1,134 @@ +/* + * 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 ff_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, +}; |