| /* |
| * 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, |
| }; |
| |
| AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts); |
| if (!fmts_list) |
| return AVERROR(ENOMEM); |
| return ff_set_common_formats(ctx, fmts_list); |
| } |
| |
| #define SET_META(key, value) \ |
| av_dict_set_int(metadata, key, value, 0); |
| |
| static int filter_frame(AVFilterLink *inlink, AVFrame *frame) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| BBoxContext *bbox = ctx->priv; |
| FFBoundingBox box; |
| int has_bbox, w, h; |
| |
| 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, |
| }; |