FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavfilter/vf_cropdetect.c
Date: 2025-10-24 21:16:34
Exec Total Coverage
Lines: 174 230 75.7%
Functions: 7 8 87.5%
Branches: 260 336 77.4%
Line Branch Exec Source
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/mem.h"
29 #include "libavutil/opt.h"
30 #include "libavutil/motion_vector.h"
31 #include "libavutil/qsort.h"
32
33 #include "avfilter.h"
34 #include "filters.h"
35 #include "video.h"
36 #include "edge_common.h"
37
38 typedef struct CropDetectContext {
39 const AVClass *class;
40 int x1, y1, x2, y2;
41 float limit;
42 float limit_upscaled;
43 int round;
44 int skip;
45 int reset_count;
46 int frame_nb;
47 int max_pixsteps[4];
48 int max_outliers;
49 int mode;
50 int window_size;
51 int mv_threshold;
52 int bitdepth;
53 float low, high;
54 uint8_t low_u8, high_u8;
55 uint8_t *filterbuf;
56 uint8_t *tmpbuf;
57 uint16_t *gradients;
58 char *directions;
59 int *bboxes[4];
60 } CropDetectContext;
61
62 static const enum AVPixelFormat pix_fmts[] = {
63 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P,
64 AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVJ422P,
65 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P,
66 AV_PIX_FMT_YUV411P, AV_PIX_FMT_GRAY8,
67 AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV410P,
68 AV_PIX_FMT_YUV420P9 , AV_PIX_FMT_YUV422P9 , AV_PIX_FMT_YUV444P9,
69 AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
70 AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12,
71 AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
72 AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
73 AV_PIX_FMT_NV12, AV_PIX_FMT_NV21,
74 AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
75 AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA,
76 AV_PIX_FMT_NONE
77 };
78
79 enum CropMode {
80 MODE_BLACK,
81 MODE_MV_EDGES,
82 MODE_NB
83 };
84
85 370 static int comp(const int *a,const int *b)
86 {
87 370 return FFDIFFSIGN(*a, *b);
88 }
89
90 3676 static int checkline(void *ctx, const unsigned char *src, int stride, int len, int bpp)
91 {
92 3676 int total = 0;
93 3676 int div = len;
94 3676 const uint16_t *src16 = (const uint16_t *)src;
95
96
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 3676 switch (bpp) {
97 3676 case 1:
98
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 334276 while (len >= 8) {
99 330600 total += src[ 0] + src[ stride] + src[2*stride] + src[3*stride]
100 330600 + src[4*stride] + src[5*stride] + src[6*stride] + src[7*stride];
101 330600 src += 8*stride;
102 330600 len -= 8;
103 }
104
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 3724 while (--len >= 0) {
105 48 total += src[0];
106 48 src += stride;
107 }
108 3676 break;
109 ✗ case 2:
110 ✗ stride >>= 1;
111 ✗ while (len >= 8) {
112 ✗ total += src16[ 0] + src16[ stride] + src16[2*stride] + src16[3*stride]
113 ✗ + src16[4*stride] + src16[5*stride] + src16[6*stride] + src16[7*stride];
114 ✗ src16 += 8*stride;
115 ✗ len -= 8;
116 }
117 ✗ while (--len >= 0) {
118 ✗ total += src16[0];
119 ✗ src16 += stride;
120 }
121 ✗ break;
122 ✗ case 3:
123 case 4:
124 ✗ while (len >= 4) {
125 ✗ total += src[0] + src[1 ] + src[2 ]
126 ✗ + src[ stride] + src[1+ stride] + src[2+ stride]
127 ✗ + src[2*stride] + src[1+2*stride] + src[2+2*stride]
128 ✗ + src[3*stride] + src[1+3*stride] + src[2+3*stride];
129 ✗ src += 4*stride;
130 ✗ len -= 4;
131 }
132 ✗ while (--len >= 0) {
133 ✗ total += src[0] + src[1] + src[2];
134 ✗ src += stride;
135 }
136 ✗ div *= 3;
137 ✗ break;
138 }
139 3676 total /= div;
140
141 3676 av_log(ctx, AV_LOG_DEBUG, "total:%d\n", total);
142 3676 return total;
143 }
144
145 2983 static int checkline_edge(void *ctx, const unsigned char *src, int stride, int len, int bpp)
146 {
147 2983 const uint16_t *src16 = (const uint16_t *)src;
148
149
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 2983 switch (bpp) {
150 2983 case 1:
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 442164 if (src[0]) return 0;
153 439288 src += stride;
154 }
155 107 break;
156 ✗ case 2:
157 ✗ stride >>= 1;
158 ✗ while (--len >= 0) {
159 ✗ if (src16[0]) return 0;
160 ✗ src16 += stride;
161 }
162 ✗ break;
163 ✗ case 3:
164 case 4:
165 ✗ while (--len >= 0) {
166 ✗ if (src[0] || src[1] || src[2]) return 0;
167 ✗ src += stride;
168 }
169 ✗ break;
170 }
171
172 107 return 1;
173 }
174
175 3 static av_cold int init(AVFilterContext *ctx)
176 {
177 3 CropDetectContext *s = ctx->priv;
178
179 3 s->frame_nb = -1 * s->skip;
180 3 s->low_u8 = s->low * 255. + .5;
181 3 s->high_u8 = s->high * 255. + .5;
182
183 3 av_log(ctx, AV_LOG_VERBOSE, "limit:%f round:%d skip:%d reset_count:%d\n",
184 3 s->limit, s->round, s->skip, s->reset_count);
185
186 3 return 0;
187 }
188
189 3 static av_cold void uninit(AVFilterContext *ctx)
190 {
191 3 CropDetectContext *s = ctx->priv;
192
193 3 av_freep(&s->tmpbuf);
194 3 av_freep(&s->filterbuf);
195 3 av_freep(&s->gradients);
196 3 av_freep(&s->directions);
197 3 av_freep(&s->bboxes[0]);
198 3 av_freep(&s->bboxes[1]);
199 3 av_freep(&s->bboxes[2]);
200 3 av_freep(&s->bboxes[3]);
201 3 }
202
203 3 static int config_input(AVFilterLink *inlink)
204 {
205 3 AVFilterContext *ctx = inlink->dst;
206 3 CropDetectContext *s = ctx->priv;
207 3 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
208 3 const int bufsize = inlink->w * inlink->h;
209
210 3 av_image_fill_max_pixsteps(s->max_pixsteps, NULL, desc);
211
212 3 s->bitdepth = desc->comp[0].depth;
213
214
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 3 if (s->limit < 1.0)
215 3 s->limit_upscaled = s->limit * ((1 << s->bitdepth) - 1);
216 else
217 ✗ s->limit_upscaled = s->limit;
218
219 3 s->x1 = inlink->w - 1;
220 3 s->y1 = inlink->h - 1;
221 3 s->x2 = 0;
222 3 s->y2 = 0;
223
224 3 s->window_size = FFMAX(s->reset_count, 15);
225 3 s->tmpbuf = av_malloc(bufsize);
226 3 s->filterbuf = av_malloc(bufsize * s->max_pixsteps[0]);
227 3 s->gradients = av_calloc(bufsize, sizeof(*s->gradients));
228 3 s->directions = av_malloc(bufsize);
229 3 s->bboxes[0] = av_malloc(s->window_size * sizeof(*s->bboxes[0]));
230 3 s->bboxes[1] = av_malloc(s->window_size * sizeof(*s->bboxes[1]));
231 3 s->bboxes[2] = av_malloc(s->window_size * sizeof(*s->bboxes[2]));
232 3 s->bboxes[3] = av_malloc(s->window_size * sizeof(*s->bboxes[3]));
233
234
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 3 if (!s->tmpbuf || !s->filterbuf || !s->gradients || !s->directions ||
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 3 !s->bboxes[0] || !s->bboxes[1] || !s->bboxes[2] || !s->bboxes[3])
236 ✗ return AVERROR(ENOMEM);
237
238 3 return 0;
239 }
240
241 #define SET_META(key, value) \
242 av_dict_set_int(metadata, key, value, 0)
243
244 50 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
245 {
246 50 AVFilterContext *ctx = inlink->dst;
247 50 CropDetectContext *s = ctx->priv;
248 50 int bpp = s->max_pixsteps[0];
249 int w, h, x, y, shrink_by, i;
250 AVDictionary **metadata;
251 int outliers, last_y;
252 50 int limit_upscaled = lrint(s->limit_upscaled);
253 char limit_str[22];
254
255 50 const int inw = inlink->w;
256 50 const int inh = inlink->h;
257 50 uint8_t *tmpbuf = s->tmpbuf;
258 50 uint8_t *filterbuf = s->filterbuf;
259 50 uint16_t *gradients = s->gradients;
260 50 int8_t *directions = s->directions;
261 50 const AVFrameSideData *sd = NULL;
262 int scan_w, scan_h, bboff;
263
264 50 void (*sobel)(int w, int h, uint16_t *dst, int dst_linesize,
265 int8_t *dir, int dir_linesize,
266
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 50 const uint8_t *src, int src_linesize, int src_stride) = (bpp == 2) ? &ff_sobel_16 : &ff_sobel_8;
267 50 void (*gaussian_blur)(int w, int h,
268 uint8_t *dst, int dst_linesize,
269
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 50 const uint8_t *src, int src_linesize, int src_stride) = (bpp == 2) ? &ff_gaussian_blur_16 : &ff_gaussian_blur_8;
270
271
272 // ignore first s->skip frames
273
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 50 if (++s->frame_nb > 0) {
274 44 metadata = &frame->metadata;
275
276 // Reset the crop area every reset_count frames, if reset_count is > 0
277
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 44 if (s->reset_count > 0 && s->frame_nb > s->reset_count) {
278 ✗ s->x1 = frame->width - 1;
279 ✗ s->y1 = frame->height - 1;
280 ✗ s->x2 = 0;
281 ✗ s->y2 = 0;
282 ✗ s->frame_nb = 1;
283 }
284
285 #define FIND(DST, FROM, NOEND, INC, STEP0, STEP1, LEN) \
286 outliers = 0;\
287 for (last_y = y = FROM; NOEND; y = y INC) {\
288 if (checkline(ctx, frame->data[0] + STEP0 * y, STEP1, LEN, bpp) > limit_upscaled) {\
289 if (++outliers > s->max_outliers) { \
290 DST = last_y;\
291 break;\
292 }\
293 } else\
294 last_y = y INC;\
295 }
296
297
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 44 if (s->mode == MODE_BLACK) {
298
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 1863 FIND(s->y1, 0, y < s->y1, +1, frame->linesize[0], bpp, frame->width);
299
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 1863 FIND(s->y2, frame->height - 1, y > FFMAX(s->y2, s->y1), -1, frame->linesize[0], bpp, frame->width);
300
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 33 FIND(s->x1, 0, y < s->x1, +1, bpp, frame->linesize[0], frame->height);
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 33 FIND(s->x2, frame->width - 1, y > FFMAX(s->x2, s->x1), -1, bpp, frame->linesize[0], frame->height);
302 } else { // MODE_MV_EDGES
303 14 sd = av_frame_get_side_data(frame, AV_FRAME_DATA_MOTION_VECTORS);
304 14 s->x1 = 0;
305 14 s->y1 = 0;
306 14 s->x2 = inw - 1;
307 14 s->y2 = inh - 1;
308
309
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 14 if (!sd) {
310 ✗ av_log(ctx, AV_LOG_WARNING, "Cannot detect: no motion vectors available");
311 } else {
312 // gaussian filter to reduce noise
313 14 gaussian_blur(inw, inh,
314 filterbuf, inw*bpp,
315 14 frame->data[0], frame->linesize[0], bpp);
316
317 // compute the 16-bits gradients and directions for the next step
318 14 sobel(inw, inh, gradients, inw, directions, inw, filterbuf, inw*bpp, bpp);
319
320 // non_maximum_suppression() will actually keep & clip what's necessary and
321 // ignore the rest, so we need a clean output buffer
322 14 memset(tmpbuf, 0, inw * inh);
323 14 ff_non_maximum_suppression(inw, inh, tmpbuf, inw, directions, inw, gradients, inw);
324
325
326 // keep high values, or low values surrounded by high values
327 14 ff_double_threshold(s->low_u8, s->high_u8, inw, inh,
328 tmpbuf, inw, tmpbuf, inw);
329
330 // scan all MVs and store bounding box
331 14 s->x1 = inw - 1;
332 14 s->y1 = inh - 1;
333 14 s->x2 = 0;
334 14 s->y2 = 0;
335
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 178654 for (i = 0; i < sd->size / sizeof(AVMotionVector); i++) {
336 178640 const AVMotionVector *mv = (const AVMotionVector*)sd->data + i;
337 178640 const int mx = mv->dst_x - mv->src_x;
338 178640 const int my = mv->dst_y - mv->src_y;
339
340
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 178640 if (mv->dst_x >= 0 && mv->dst_x < inw &&
341
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344
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 178640 mx * mx + my * my >= s->mv_threshold * s->mv_threshold) {
345 263 s->x1 = mv->dst_x < s->x1 ? mv->dst_x : s->x1;
346 263 s->y1 = mv->dst_y < s->y1 ? mv->dst_y : s->y1;
347 263 s->x2 = mv->dst_x > s->x2 ? mv->dst_x : s->x2;
348 263 s->y2 = mv->dst_y > s->y2 ? mv->dst_y : s->y2;
349 }
350 }
351
352 // assert x1<x2, y1<y2
353
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 14 if (s->x1 > s->x2) FFSWAP(int, s->x1, s->x2);
354
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 14 if (s->y1 > s->y2) FFSWAP(int, s->y1, s->y2);
355
356 // scan outward looking for 0-edge-lines in edge image
357 14 scan_w = s->x2 - s->x1;
358 14 scan_h = s->y2 - s->y1;
359
360 #define FIND_EDGE(DST, FROM, NOEND, INC, STEP0, STEP1, LEN) \
361 for (last_y = y = FROM; NOEND; y = y INC) { \
362 if (checkline_edge(ctx, tmpbuf + STEP0 * y, STEP1, LEN, bpp)) { \
363 if (last_y INC == y) { \
364 DST = y; \
365 break; \
366 } else \
367 last_y = y; \
368 } \
369 } \
370 if (!(NOEND)) { \
371 DST = y -(INC); \
372 }
373
374
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 495 FIND_EDGE(s->y1, s->y1, y >= 0, -1, inw, bpp, scan_w);
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 461 FIND_EDGE(s->y2, s->y2, y < inh, +1, inw, bpp, scan_w);
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 1037 FIND_EDGE(s->x1, s->x1, y >= 0, -1, bpp, inw, scan_h);
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 998 FIND_EDGE(s->x2, s->x2, y < inw, +1, bpp, inw, scan_h);
378
379 // queue bboxes
380 14 bboff = (s->frame_nb - 1) % s->window_size;
381 14 s->bboxes[0][bboff] = s->x1;
382 14 s->bboxes[1][bboff] = s->x2;
383 14 s->bboxes[2][bboff] = s->y1;
384 14 s->bboxes[3][bboff] = s->y2;
385
386 // sort queue
387 14 bboff = FFMIN(s->frame_nb, s->window_size);
388
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 88 AV_QSORT(s->bboxes[0], bboff, int, comp);
389
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 91 AV_QSORT(s->bboxes[1], bboff, int, comp);
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 92 AV_QSORT(s->bboxes[2], bboff, int, comp);
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 89 AV_QSORT(s->bboxes[3], bboff, int, comp);
392
393 // return median of window_size elems
394 14 s->x1 = s->bboxes[0][bboff/2];
395 14 s->x2 = s->bboxes[1][bboff/2];
396 14 s->y1 = s->bboxes[2][bboff/2];
397 14 s->y2 = s->bboxes[3][bboff/2];
398 }
399 }
400
401 // round x and y (up), important for yuv colorspaces
402 // make sure they stay rounded!
403 44 x = (s->x1+1) & ~1;
404 44 y = (s->y1+1) & ~1;
405
406 44 w = s->x2 - x + 1;
407 44 h = s->y2 - y + 1;
408
409 // w and h must be divisible by 2 as well because of yuv
410 // colorspace problems.
411
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 44 if (s->round <= 1)
412 ✗ s->round = 16;
413
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 44 if (s->round % 2)
414 ✗ s->round *= 2;
415
416 44 shrink_by = w % s->round;
417 44 w -= shrink_by;
418 44 x += (shrink_by/2 + 1) & ~1;
419
420 44 shrink_by = h % s->round;
421 44 h -= shrink_by;
422 44 y += (shrink_by/2 + 1) & ~1;
423
424 44 SET_META("lavfi.cropdetect.x1", s->x1);
425 44 SET_META("lavfi.cropdetect.x2", s->x2);
426 44 SET_META("lavfi.cropdetect.y1", s->y1);
427 44 SET_META("lavfi.cropdetect.y2", s->y2);
428 44 SET_META("lavfi.cropdetect.w", w);
429 44 SET_META("lavfi.cropdetect.h", h);
430 44 SET_META("lavfi.cropdetect.x", x);
431 44 SET_META("lavfi.cropdetect.y", y);
432
433 44 snprintf(limit_str, sizeof(limit_str), "%f", s->limit);
434 44 av_dict_set(metadata, "lavfi.cropdetect.limit", limit_str, 0);
435
436 44 av_log(ctx, AV_LOG_INFO,
437 "x1:%d x2:%d y1:%d y2:%d w:%d h:%d x:%d y:%d pts:%"PRId64" t:%f limit:%f crop=%d:%d:%d:%d\n",
438 s->x1, s->x2, s->y1, s->y2, w, h, x, y, frame->pts,
439 44 frame->pts == AV_NOPTS_VALUE ? -1 : frame->pts * av_q2d(inlink->time_base),
440
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 44 s->limit, w, h, x, y);
441 }
442
443 50 return ff_filter_frame(inlink->dst->outputs[0], frame);
444 }
445
446 ✗ static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
447 char *res, int res_len, int flags)
448 {
449 ✗ CropDetectContext *s = ctx->priv;
450 ✗ float old_limit = s->limit;
451 int ret;
452
453 ✗ if ((ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags)) < 0)
454 ✗ return ret;
455
456 ✗ if (old_limit != s->limit) {
457 ✗ if (s->limit < 1.0)
458 ✗ s->limit_upscaled = s->limit * ((1 << s->bitdepth) - 1);
459 else
460 ✗ s->limit_upscaled = s->limit;
461 ✗ s->frame_nb = s->reset_count;
462 }
463
464 ✗ return 0;
465 }
466
467 #define OFFSET(x) offsetof(CropDetectContext, x)
468 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
469 #define TFLAGS AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_RUNTIME_PARAM
470
471 static const AVOption cropdetect_options[] = {
472 { "limit", "Threshold below which the pixel is considered black", OFFSET(limit), AV_OPT_TYPE_FLOAT, { .dbl = 24.0/255 }, 0, 65535, TFLAGS },
473 { "round", "Value by which the width/height should be divisible", OFFSET(round), AV_OPT_TYPE_INT, { .i64 = 16 }, 0, INT_MAX, FLAGS },
474 { "reset", "Recalculate the crop area after this many frames", OFFSET(reset_count), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
475 { "skip", "Number of initial frames to skip", OFFSET(skip), AV_OPT_TYPE_INT, { .i64 = 2 }, 0, INT_MAX, FLAGS },
476 { "reset_count", "Recalculate the crop area after this many frames",OFFSET(reset_count),AV_OPT_TYPE_INT,{ .i64 = 0 }, 0, INT_MAX, FLAGS },
477 { "max_outliers", "Threshold count of outliers", OFFSET(max_outliers),AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
478 { "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_BLACK}, 0, MODE_NB-1, FLAGS, .unit = "mode" },
479 { "black", "detect black pixels surrounding the video", 0, AV_OPT_TYPE_CONST, {.i64=MODE_BLACK}, INT_MIN, INT_MAX, FLAGS, .unit = "mode" },
480 { "mvedges", "detect motion and edged surrounding the video", 0, AV_OPT_TYPE_CONST, {.i64=MODE_MV_EDGES}, INT_MIN, INT_MAX, FLAGS, .unit = "mode" },
481 { "high", "Set high threshold for edge detection", OFFSET(high), AV_OPT_TYPE_FLOAT, {.dbl=25/255.}, 0, 1, FLAGS },
482 { "low", "Set low threshold for edge detection", OFFSET(low), AV_OPT_TYPE_FLOAT, {.dbl=15/255.}, 0, 1, FLAGS },
483 { "mv_threshold", "motion vector threshold when estimating video window size", OFFSET(mv_threshold), AV_OPT_TYPE_INT, {.i64=8}, 0, 100, FLAGS},
484 { NULL }
485 };
486
487 AVFILTER_DEFINE_CLASS(cropdetect);
488
489 static const AVFilterPad avfilter_vf_cropdetect_inputs[] = {
490 {
491 .name = "default",
492 .type = AVMEDIA_TYPE_VIDEO,
493 .config_props = config_input,
494 .filter_frame = filter_frame,
495 },
496 };
497
498 const FFFilter ff_vf_cropdetect = {
499 .p.name = "cropdetect",
500 .p.description = NULL_IF_CONFIG_SMALL("Auto-detect crop size."),
501 .p.priv_class = &cropdetect_class,
502 .p.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_METADATA_ONLY,
503 .priv_size = sizeof(CropDetectContext),
504 .init = init,
505 .uninit = uninit,
506 FILTER_INPUTS(avfilter_vf_cropdetect_inputs),
507 FILTER_OUTPUTS(ff_video_default_filterpad),
508 FILTER_PIXFMTS_ARRAY(pix_fmts),
509 .process_command = process_command,
510 };
511