FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
vf_bbox.c
Go to the documentation of this file.
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/opt.h"
27 #include "libavutil/pixdesc.h"
28 #include "libavutil/timestamp.h"
29 #include "avfilter.h"
30 #include "bbox.h"
31 #include "internal.h"
32 
33 typedef struct BBoxContext {
34  const AVClass *class;
35  int min_val;
36 } BBoxContext;
37 
38 #define OFFSET(x) offsetof(BBoxContext, x)
39 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
40 
41 static const AVOption bbox_options[] = {
42  { "min_val", "set minimum luminance value for bounding box", OFFSET(min_val), AV_OPT_TYPE_INT, { .i64 = 16 }, 0, 254, FLAGS },
43  { NULL }
44 };
45 
47 
49 {
50  static const enum AVPixelFormat pix_fmts[] = {
57  };
58 
59  AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
60  if (!fmts_list)
61  return AVERROR(ENOMEM);
62  return ff_set_common_formats(ctx, fmts_list);
63 }
64 
65 #define SET_META(key, value) \
66  av_dict_set_int(metadata, key, value, 0);
67 
68 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
69 {
70  AVFilterContext *ctx = inlink->dst;
71  BBoxContext *bbox = ctx->priv;
72  FFBoundingBox box;
73  int has_bbox, w, h;
74 
75  has_bbox =
77  frame->data[0], frame->linesize[0],
78  inlink->w, inlink->h, bbox->min_val);
79  w = box.x2 - box.x1 + 1;
80  h = box.y2 - box.y1 + 1;
81 
82  av_log(ctx, AV_LOG_INFO,
83  "n:%"PRId64" pts:%s pts_time:%s", inlink->frame_count_out,
84  av_ts2str(frame->pts), av_ts2timestr(frame->pts, &inlink->time_base));
85 
86  if (has_bbox) {
87  AVDictionary **metadata = &frame->metadata;
88 
89  SET_META("lavfi.bbox.x1", box.x1)
90  SET_META("lavfi.bbox.x2", box.x2)
91  SET_META("lavfi.bbox.y1", box.y1)
92  SET_META("lavfi.bbox.y2", box.y2)
93  SET_META("lavfi.bbox.w", w)
94  SET_META("lavfi.bbox.h", h)
95 
96  av_log(ctx, AV_LOG_INFO,
97  " x1:%d x2:%d y1:%d y2:%d w:%d h:%d"
98  " crop=%d:%d:%d:%d drawbox=%d:%d:%d:%d",
99  box.x1, box.x2, box.y1, box.y2, w, h,
100  w, h, box.x1, box.y1, /* crop params */
101  box.x1, box.y1, w, h); /* drawbox params */
102  }
103  av_log(ctx, AV_LOG_INFO, "\n");
104 
105  return ff_filter_frame(inlink->dst->outputs[0], frame);
106 }
107 
108 static const AVFilterPad bbox_inputs[] = {
109  {
110  .name = "default",
111  .type = AVMEDIA_TYPE_VIDEO,
112  .filter_frame = filter_frame,
113  },
114  { NULL }
115 };
116 
117 static const AVFilterPad bbox_outputs[] = {
118  {
119  .name = "default",
120  .type = AVMEDIA_TYPE_VIDEO,
121  },
122  { NULL }
123 };
124 
126  .name = "bbox",
127  .description = NULL_IF_CONFIG_SMALL("Compute bounding box for each frame."),
128  .priv_size = sizeof(BBoxContext),
129  .priv_class = &bbox_class,
131  .inputs = bbox_inputs,
132  .outputs = bbox_outputs,
134 };
#define NULL
Definition: coverity.c:32
static const AVFilterPad bbox_inputs[]
Definition: vf_bbox.c:108
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
Definition: vf_bbox.c:68
This structure describes decoded (raw) audio or video data.
Definition: frame.h:201
AVOption.
Definition: opt.h:246
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:67
Main libavfilter public API header.
AVFilter ff_vf_bbox
Definition: vf_bbox.c:125
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:283
#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
Some filters support a generic "enable" expression option that can be used to enable or disable a fil...
Definition: avfilter.h:125
const char * name
Pad name.
Definition: internal.h:60
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1151
AVOptions.
timestamp utils, mostly useful for debugging/logging purposes
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:294
static AVFrame * frame
static int flags
Definition: log.c:57
AVDictionary * metadata
metadata.
Definition: frame.h:488
#define av_log(a,...)
#define SET_META(key, value)
Definition: vf_bbox.c:65
A filter pad used for either input or output.
Definition: internal.h:54
int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
A helper for query_formats() which sets all links to the same list of formats.
Definition: formats.c:568
AVFILTER_DEFINE_CLASS(bbox)
#define AVERROR(e)
Definition: error.h:43
#define av_ts2timestr(ts, tb)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: timestamp.h:76
int x2
Definition: bbox.h:27
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:179
void * priv
private data for use by the filter
Definition: avfilter.h:353
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:66
#define FLAGS
Definition: vf_bbox.c:39
static const AVOption bbox_options[]
Definition: vf_bbox.c:41
AVFormatContext * ctx
Definition: movenc.c:48
static const AVFilterPad outputs[]
Definition: af_afftfilt.c:389
int min_val
Definition: vf_bbox.c:35
int y1
Definition: bbox.h:27
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
static const AVFilterPad inputs[]
Definition: af_afftfilt.c:379
#define OFFSET(x)
Definition: vf_bbox.c:38
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:232
static int query_formats(AVFilterContext *ctx)
Definition: vf_bbox.c:48
Describe the class of an AVClass context structure.
Definition: log.h:67
Filter definition.
Definition: avfilter.h:144
static const AVFilterPad bbox_outputs[]
Definition: vf_bbox.c:117
const char * name
Filter name.
Definition: avfilter.h:148
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:350
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:266
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:215
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:62
int ff_calculate_bounding_box(FFBoundingBox *bbox, const uint8_t *data, int linesize, int w, int h, int min_val)
Calculate the smallest rectangle that will encompass the region with values > min_val.
Definition: bbox.c:23
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:69
int y2
Definition: bbox.h:27
#define av_ts2str(ts)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: timestamp.h:54
A list of supported formats for one end of a filter link.
Definition: formats.h:64
int x1
Definition: bbox.h:27
An instance of a filter.
Definition: avfilter.h:338
planar YUV 4:4:0 (1 Cr & Cb sample per 1x2 Y samples)
Definition: pixfmt.h:100
internal API functions
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60