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1 | /* |
2 | * Copyright (c) 2002 A'rpi | |
3 | * This file is part of FFmpeg. | |
4 | * | |
5 | * FFmpeg is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * FFmpeg is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along | |
16 | * with FFmpeg; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | */ | |
19 | ||
20 | /** | |
21 | * @file | |
22 | * border detection filter | |
23 | * Ported from MPlayer libmpcodecs/vf_cropdetect.c. | |
24 | */ | |
25 | ||
26 | #include "libavutil/imgutils.h" | |
27 | #include "libavutil/internal.h" | |
28 | #include "libavutil/opt.h" | |
29 | ||
30 | #include "avfilter.h" | |
31 | #include "formats.h" | |
32 | #include "internal.h" | |
33 | #include "video.h" | |
34 | ||
35 | typedef struct CropDetectContext { | |
36 | const AVClass *class; | |
37 | int x1, y1, x2, y2; | |
38 | int limit; | |
39 | int round; | |
40 | int reset_count; | |
41 | int frame_nb; | |
42 | int max_pixsteps[4]; | |
43 | } CropDetectContext; | |
44 | ||
45 | static int query_formats(AVFilterContext *ctx) | |
46 | { | |
47 | static const enum AVPixelFormat pix_fmts[] = { | |
48 | AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P, | |
49 | AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVJ422P, | |
50 | AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P, | |
51 | AV_PIX_FMT_YUV411P, AV_PIX_FMT_GRAY8, | |
52 | AV_PIX_FMT_NV12, AV_PIX_FMT_NV21, | |
53 | AV_PIX_FMT_NONE | |
54 | }; | |
55 | ||
56 | ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); | |
57 | return 0; | |
58 | } | |
59 | ||
60 | static int checkline(void *ctx, const unsigned char *src, int stride, int len, int bpp) | |
61 | { | |
62 | int total = 0; | |
63 | int div = len; | |
64 | ||
65 | switch (bpp) { | |
66 | case 1: | |
67 | while (--len >= 0) { | |
68 | total += src[0]; | |
69 | src += stride; | |
70 | } | |
71 | break; | |
72 | case 3: | |
73 | case 4: | |
74 | while (--len >= 0) { | |
75 | total += src[0] + src[1] + src[2]; | |
76 | src += stride; | |
77 | } | |
78 | div *= 3; | |
79 | break; | |
80 | } | |
81 | total /= div; | |
82 | ||
83 | av_log(ctx, AV_LOG_DEBUG, "total:%d\n", total); | |
84 | return total; | |
85 | } | |
86 | ||
87 | static av_cold int init(AVFilterContext *ctx) | |
88 | { | |
89 | CropDetectContext *s = ctx->priv; | |
90 | ||
91 | s->frame_nb = -2; | |
92 | ||
93 | av_log(ctx, AV_LOG_VERBOSE, "limit:%d round:%d reset_count:%d\n", | |
94 | s->limit, s->round, s->reset_count); | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
99 | static int config_input(AVFilterLink *inlink) | |
100 | { | |
101 | AVFilterContext *ctx = inlink->dst; | |
102 | CropDetectContext *s = ctx->priv; | |
103 | ||
104 | av_image_fill_max_pixsteps(s->max_pixsteps, NULL, | |
105 | av_pix_fmt_desc_get(inlink->format)); | |
106 | ||
107 | s->x1 = inlink->w - 1; | |
108 | s->y1 = inlink->h - 1; | |
109 | s->x2 = 0; | |
110 | s->y2 = 0; | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | #define SET_META(key, value) \ | |
116 | av_dict_set_int(metadata, key, value, 0) | |
117 | ||
118 | static int filter_frame(AVFilterLink *inlink, AVFrame *frame) | |
119 | { | |
120 | AVFilterContext *ctx = inlink->dst; | |
121 | CropDetectContext *s = ctx->priv; | |
122 | int bpp = s->max_pixsteps[0]; | |
123 | int w, h, x, y, shrink_by; | |
124 | AVDictionary **metadata; | |
125 | ||
126 | // ignore first 2 frames - they may be empty | |
127 | if (++s->frame_nb > 0) { | |
128 | metadata = avpriv_frame_get_metadatap(frame); | |
129 | ||
130 | // Reset the crop area every reset_count frames, if reset_count is > 0 | |
131 | if (s->reset_count > 0 && s->frame_nb > s->reset_count) { | |
132 | s->x1 = frame->width - 1; | |
133 | s->y1 = frame->height - 1; | |
134 | s->x2 = 0; | |
135 | s->y2 = 0; | |
136 | s->frame_nb = 1; | |
137 | } | |
138 | ||
139 | for (y = 0; y < s->y1; y++) { | |
140 | if (checkline(ctx, frame->data[0] + frame->linesize[0] * y, bpp, frame->width, bpp) > s->limit) { | |
141 | s->y1 = y; | |
142 | break; | |
143 | } | |
144 | } | |
145 | ||
146 | for (y = frame->height - 1; y > FFMAX(s->y2, s->y1); y--) { | |
147 | if (checkline(ctx, frame->data[0] + frame->linesize[0] * y, bpp, frame->width, bpp) > s->limit) { | |
148 | s->y2 = y; | |
149 | break; | |
150 | } | |
151 | } | |
152 | ||
153 | for (y = 0; y < s->x1; y++) { | |
154 | if (checkline(ctx, frame->data[0] + bpp*y, frame->linesize[0], frame->height, bpp) > s->limit) { | |
155 | s->x1 = y; | |
156 | break; | |
157 | } | |
158 | } | |
159 | ||
160 | for (y = frame->width - 1; y > FFMAX(s->x2, s->x1); y--) { | |
161 | if (checkline(ctx, frame->data[0] + bpp*y, frame->linesize[0], frame->height, bpp) > s->limit) { | |
162 | s->x2 = y; | |
163 | break; | |
164 | } | |
165 | } | |
166 | ||
167 | // round x and y (up), important for yuv colorspaces | |
168 | // make sure they stay rounded! | |
169 | x = (s->x1+1) & ~1; | |
170 | y = (s->y1+1) & ~1; | |
171 | ||
172 | w = s->x2 - x + 1; | |
173 | h = s->y2 - y + 1; | |
174 | ||
175 | // w and h must be divisible by 2 as well because of yuv | |
176 | // colorspace problems. | |
177 | if (s->round <= 1) | |
178 | s->round = 16; | |
179 | if (s->round % 2) | |
180 | s->round *= 2; | |
181 | ||
182 | shrink_by = w % s->round; | |
183 | w -= shrink_by; | |
184 | x += (shrink_by/2 + 1) & ~1; | |
185 | ||
186 | shrink_by = h % s->round; | |
187 | h -= shrink_by; | |
188 | y += (shrink_by/2 + 1) & ~1; | |
189 | ||
190 | SET_META("lavfi.cropdetect.x1", s->x1); | |
191 | SET_META("lavfi.cropdetect.x2", s->x2); | |
192 | SET_META("lavfi.cropdetect.y1", s->y1); | |
193 | SET_META("lavfi.cropdetect.y2", s->y2); | |
194 | SET_META("lavfi.cropdetect.w", w); | |
195 | SET_META("lavfi.cropdetect.h", h); | |
196 | SET_META("lavfi.cropdetect.x", x); | |
197 | SET_META("lavfi.cropdetect.y", y); | |
198 | ||
199 | av_log(ctx, AV_LOG_INFO, | |
200 | "x1:%d x2:%d y1:%d y2:%d w:%d h:%d x:%d y:%d pts:%"PRId64" t:%f crop=%d:%d:%d:%d\n", | |
201 | s->x1, s->x2, s->y1, s->y2, w, h, x, y, frame->pts, | |
202 | frame->pts == AV_NOPTS_VALUE ? -1 : frame->pts * av_q2d(inlink->time_base), | |
203 | w, h, x, y); | |
204 | } | |
205 | ||
206 | return ff_filter_frame(inlink->dst->outputs[0], frame); | |
207 | } | |
208 | ||
209 | #define OFFSET(x) offsetof(CropDetectContext, x) | |
210 | #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM | |
211 | ||
212 | static const AVOption cropdetect_options[] = { | |
213 | { "limit", "Threshold below which the pixel is considered black", OFFSET(limit), AV_OPT_TYPE_INT, { .i64 = 24 }, 0, 255, FLAGS }, | |
214 | { "round", "Value by which the width/height should be divisible", OFFSET(round), AV_OPT_TYPE_INT, { .i64 = 16 }, 0, INT_MAX, FLAGS }, | |
215 | { "reset", "Recalculate the crop area after this many frames", OFFSET(reset_count), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS }, | |
216 | { "reset_count", "Recalculate the crop area after this many frames",OFFSET(reset_count),AV_OPT_TYPE_INT,{ .i64 = 0 }, 0, INT_MAX, FLAGS }, | |
217 | { NULL } | |
218 | }; | |
219 | ||
220 | AVFILTER_DEFINE_CLASS(cropdetect); | |
221 | ||
222 | static const AVFilterPad avfilter_vf_cropdetect_inputs[] = { | |
223 | { | |
224 | .name = "default", | |
225 | .type = AVMEDIA_TYPE_VIDEO, | |
226 | .config_props = config_input, | |
227 | .filter_frame = filter_frame, | |
228 | }, | |
229 | { NULL } | |
230 | }; | |
231 | ||
232 | static const AVFilterPad avfilter_vf_cropdetect_outputs[] = { | |
233 | { | |
234 | .name = "default", | |
235 | .type = AVMEDIA_TYPE_VIDEO | |
236 | }, | |
237 | { NULL } | |
238 | }; | |
239 | ||
240 | AVFilter ff_vf_cropdetect = { | |
241 | .name = "cropdetect", | |
242 | .description = NULL_IF_CONFIG_SMALL("Auto-detect crop size."), | |
243 | .priv_size = sizeof(CropDetectContext), | |
244 | .priv_class = &cropdetect_class, | |
245 | .init = init, | |
246 | .query_formats = query_formats, | |
247 | .inputs = avfilter_vf_cropdetect_inputs, | |
248 | .outputs = avfilter_vf_cropdetect_outputs, | |
249 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, | |
250 | }; |