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vf_bbox.c
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1 /*
2  * Copyright (c) 2012 Stefano Sabatini
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * bounding box detection filter
24  */
25 
26 #include "libavutil/pixdesc.h"
27 #include "libavutil/timestamp.h"
28 #include "avfilter.h"
29 #include "bbox.h"
30 #include "internal.h"
31 
32 typedef struct {
33  unsigned int frame;
34  int vsub, hsub;
35 } BBoxContext;
36 
37 static av_cold int init(AVFilterContext *ctx, const char *args)
38 {
39  BBoxContext *bbox = ctx->priv;
40  bbox->frame = 0;
41  return 0;
42 }
43 
45 {
46  static const enum AVPixelFormat pix_fmts[] = {
53  };
54 
56  return 0;
57 }
58 
59 static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
60 {
61  AVFilterContext *ctx = inlink->dst;
62  BBoxContext *bbox = ctx->priv;
63  FFBoundingBox box;
64  int has_bbox, w, h;
65 
66  has_bbox =
68  picref->data[0], picref->linesize[0],
69  inlink->w, inlink->h, 16);
70  w = box.x2 - box.x1 + 1;
71  h = box.y2 - box.y1 + 1;
72 
73  av_log(ctx, AV_LOG_INFO,
74  "n:%d pts:%s pts_time:%s", bbox->frame,
75  av_ts2str(picref->pts), av_ts2timestr(picref->pts, &inlink->time_base));
76 
77  if (has_bbox) {
78  av_log(ctx, AV_LOG_INFO,
79  " x1:%d x2:%d y1:%d y2:%d w:%d h:%d"
80  " crop=%d:%d:%d:%d drawbox=%d:%d:%d:%d",
81  box.x1, box.x2, box.y1, box.y2, w, h,
82  w, h, box.x1, box.y1, /* crop params */
83  box.x1, box.y1, w, h); /* drawbox params */
84  }
85  av_log(ctx, AV_LOG_INFO, "\n");
86 
87  bbox->frame++;
88  return ff_filter_frame(inlink->dst->outputs[0], picref);
89 }
90 
91 static const AVFilterPad bbox_inputs[] = {
92  {
93  .name = "default",
94  .type = AVMEDIA_TYPE_VIDEO,
95  .get_video_buffer = ff_null_get_video_buffer,
96  .filter_frame = filter_frame,
97  .min_perms = AV_PERM_READ,
98  },
99  { NULL }
100 };
101 
102 static const AVFilterPad bbox_outputs[] = {
103  {
104  .name = "default",
105  .type = AVMEDIA_TYPE_VIDEO,
106  },
107  { NULL }
108 };
109 
111  .name = "bbox",
112  .description = NULL_IF_CONFIG_SMALL("Compute bounding box for each frame."),
113  .priv_size = sizeof(BBoxContext),
115  .init = init,
116  .inputs = bbox_inputs,
117  .outputs = bbox_outputs,
118 };