yading@10: /*
yading@10:  * Copyright (c) 2012 Stefano Sabatini
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * bounding box detection filter
yading@10:  */
yading@10: 
yading@10: #include "libavutil/pixdesc.h"
yading@10: #include "libavutil/timestamp.h"
yading@10: #include "avfilter.h"
yading@10: #include "bbox.h"
yading@10: #include "internal.h"
yading@10: 
yading@10: typedef struct {
yading@10:     unsigned int frame;
yading@10: } BBoxContext;
yading@10: 
yading@10: static int query_formats(AVFilterContext *ctx)
yading@10: {
yading@10:     static const enum AVPixelFormat pix_fmts[] = {
yading@10:         AV_PIX_FMT_YUV420P,
yading@10:         AV_PIX_FMT_YUV444P,
yading@10:         AV_PIX_FMT_YUV440P,
yading@10:         AV_PIX_FMT_YUV422P,
yading@10:         AV_PIX_FMT_YUV411P,
yading@10:         AV_PIX_FMT_NONE,
yading@10:     };
yading@10: 
yading@10:     ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
yading@10: {
yading@10:     AVFilterContext *ctx = inlink->dst;
yading@10:     BBoxContext *bbox = ctx->priv;
yading@10:     FFBoundingBox box;
yading@10:     int has_bbox, w, h;
yading@10: 
yading@10:     has_bbox =
yading@10:         ff_calculate_bounding_box(&box,
yading@10:                                   frame->data[0], frame->linesize[0],
yading@10:                                   inlink->w, inlink->h, 16);
yading@10:     w = box.x2 - box.x1 + 1;
yading@10:     h = box.y2 - box.y1 + 1;
yading@10: 
yading@10:     av_log(ctx, AV_LOG_INFO,
yading@10:            "n:%d pts:%s pts_time:%s", bbox->frame,
yading@10:            av_ts2str(frame->pts), av_ts2timestr(frame->pts, &inlink->time_base));
yading@10: 
yading@10:     if (has_bbox) {
yading@10:         av_log(ctx, AV_LOG_INFO,
yading@10:                " x1:%d x2:%d y1:%d y2:%d w:%d h:%d"
yading@10:                " crop=%d:%d:%d:%d drawbox=%d:%d:%d:%d",
yading@10:                box.x1, box.x2, box.y1, box.y2, w, h,
yading@10:                w, h, box.x1, box.y1,    /* crop params */
yading@10:                box.x1, box.y1, w, h);   /* drawbox params */
yading@10:     }
yading@10:     av_log(ctx, AV_LOG_INFO, "\n");
yading@10: 
yading@10:     bbox->frame++;
yading@10:     return ff_filter_frame(inlink->dst->outputs[0], frame);
yading@10: }
yading@10: 
yading@10: static const AVFilterPad bbox_inputs[] = {
yading@10:     {
yading@10:         .name             = "default",
yading@10:         .type             = AVMEDIA_TYPE_VIDEO,
yading@10:         .filter_frame     = filter_frame,
yading@10:     },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: static const AVFilterPad bbox_outputs[] = {
yading@10:     {
yading@10:         .name = "default",
yading@10:         .type = AVMEDIA_TYPE_VIDEO,
yading@10:     },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: AVFilter avfilter_vf_bbox = {
yading@10:     .name          = "bbox",
yading@10:     .description   = NULL_IF_CONFIG_SMALL("Compute bounding box for each frame."),
yading@10:     .priv_size     = sizeof(BBoxContext),
yading@10:     .query_formats = query_formats,
yading@10:     .inputs        = bbox_inputs,
yading@10:     .outputs       = bbox_outputs,
yading@10: };