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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/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 { | |
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 | ||
46 | AVFILTER_DEFINE_CLASS(bbox); | |
47 | ||
48 | static int query_formats(AVFilterContext *ctx) | |
49 | { | |
50 | static const enum AVPixelFormat pix_fmts[] = { | |
51 | AV_PIX_FMT_YUV420P, | |
52 | AV_PIX_FMT_YUV444P, | |
53 | AV_PIX_FMT_YUV440P, | |
54 | AV_PIX_FMT_YUV422P, | |
55 | AV_PIX_FMT_YUV411P, | |
56 | AV_PIX_FMT_NONE, | |
57 | }; | |
58 | ||
59 | ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); | |
60 | return 0; | |
61 | } | |
62 | ||
63 | #define SET_META(key, value) \ | |
64 | av_dict_set_int(metadata, key, value, 0); | |
65 | ||
66 | static int filter_frame(AVFilterLink *inlink, AVFrame *frame) | |
67 | { | |
68 | AVFilterContext *ctx = inlink->dst; | |
69 | BBoxContext *bbox = ctx->priv; | |
70 | FFBoundingBox box; | |
71 | int has_bbox, w, h; | |
72 | ||
73 | has_bbox = | |
74 | ff_calculate_bounding_box(&box, | |
75 | frame->data[0], frame->linesize[0], | |
76 | inlink->w, inlink->h, bbox->min_val); | |
77 | w = box.x2 - box.x1 + 1; | |
78 | h = box.y2 - box.y1 + 1; | |
79 | ||
80 | av_log(ctx, AV_LOG_INFO, | |
81 | "n:%"PRId64" pts:%s pts_time:%s", inlink->frame_count, | |
82 | av_ts2str(frame->pts), av_ts2timestr(frame->pts, &inlink->time_base)); | |
83 | ||
84 | if (has_bbox) { | |
85 | AVDictionary **metadata = avpriv_frame_get_metadatap(frame); | |
86 | ||
87 | SET_META("lavfi.bbox.x1", box.x1) | |
88 | SET_META("lavfi.bbox.x2", box.x2) | |
89 | SET_META("lavfi.bbox.y1", box.y1) | |
90 | SET_META("lavfi.bbox.y2", box.y2) | |
91 | SET_META("lavfi.bbox.w", w) | |
92 | SET_META("lavfi.bbox.h", h) | |
93 | ||
94 | av_log(ctx, AV_LOG_INFO, | |
95 | " x1:%d x2:%d y1:%d y2:%d w:%d h:%d" | |
96 | " crop=%d:%d:%d:%d drawbox=%d:%d:%d:%d", | |
97 | box.x1, box.x2, box.y1, box.y2, w, h, | |
98 | w, h, box.x1, box.y1, /* crop params */ | |
99 | box.x1, box.y1, w, h); /* drawbox params */ | |
100 | } | |
101 | av_log(ctx, AV_LOG_INFO, "\n"); | |
102 | ||
103 | return ff_filter_frame(inlink->dst->outputs[0], frame); | |
104 | } | |
105 | ||
106 | static const AVFilterPad bbox_inputs[] = { | |
107 | { | |
108 | .name = "default", | |
109 | .type = AVMEDIA_TYPE_VIDEO, | |
110 | .filter_frame = filter_frame, | |
111 | }, | |
112 | { NULL } | |
113 | }; | |
114 | ||
115 | static const AVFilterPad bbox_outputs[] = { | |
116 | { | |
117 | .name = "default", | |
118 | .type = AVMEDIA_TYPE_VIDEO, | |
119 | }, | |
120 | { NULL } | |
121 | }; | |
122 | ||
123 | AVFilter ff_vf_bbox = { | |
124 | .name = "bbox", | |
125 | .description = NULL_IF_CONFIG_SMALL("Compute bounding box for each frame."), | |
126 | .priv_size = sizeof(BBoxContext), | |
127 | .priv_class = &bbox_class, | |
128 | .query_formats = query_formats, | |
129 | .inputs = bbox_inputs, | |
130 | .outputs = bbox_outputs, | |
131 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, | |
132 | }; |