FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavfilter/vf_deshake.c
Date: 2024-04-12 08:31:17
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1 /*
2 * Copyright (C) 2010 Georg Martius <georg.martius@web.de>
3 * Copyright (C) 2010 Daniel G. Taylor <dan@programmer-art.org>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * fast deshake / depan video filter
25 *
26 * SAD block-matching motion compensation to fix small changes in
27 * horizontal and/or vertical shift. This filter helps remove camera shake
28 * from hand-holding a camera, bumping a tripod, moving on a vehicle, etc.
29 *
30 * Algorithm:
31 * - For each frame with one previous reference frame
32 * - For each block in the frame
33 * - If contrast > threshold then find likely motion vector
34 * - For all found motion vectors
35 * - Find most common, store as global motion vector
36 * - Find most likely rotation angle
37 * - Transform image along global motion
38 *
39 * TODO:
40 * - Fill frame edges based on previous/next reference frames
41 * - Fill frame edges by stretching image near the edges?
42 * - Can this be done quickly and look decent?
43 *
44 * Dark Shikari links to http://wiki.videolan.org/SoC_x264_2010#GPU_Motion_Estimation_2
45 * for an algorithm similar to what could be used here to get the gmv
46 * It requires only a couple diamond searches + fast downscaling
47 *
48 * Special thanks to Jason Kotenko for his help with the algorithm and my
49 * inability to see simple errors in C code.
50 */
51
52 #include "avfilter.h"
53 #include "internal.h"
54 #include "transform.h"
55 #include "video.h"
56 #include "libavutil/common.h"
57 #include "libavutil/file_open.h"
58 #include "libavutil/mem.h"
59 #include "libavutil/opt.h"
60 #include "libavutil/pixdesc.h"
61 #include "libavutil/pixelutils.h"
62 #include "libavutil/qsort.h"
63
64
65 enum SearchMethod {
66 EXHAUSTIVE, ///< Search all possible positions
67 SMART_EXHAUSTIVE, ///< Search most possible positions (faster)
68 SEARCH_COUNT
69 };
70
71 typedef struct IntMotionVector {
72 int x; ///< Horizontal shift
73 int y; ///< Vertical shift
74 } IntMotionVector;
75
76 typedef struct MotionVector {
77 double x; ///< Horizontal shift
78 double y; ///< Vertical shift
79 } MotionVector;
80
81 typedef struct Transform {
82 MotionVector vec; ///< Motion vector
83 double angle; ///< Angle of rotation
84 double zoom; ///< Zoom percentage
85 } Transform;
86
87 #define MAX_R 64
88
89 typedef struct DeshakeContext {
90 const AVClass *class;
91 int counts[2*MAX_R+1][2*MAX_R+1]; ///< Scratch buffer for motion search
92 double *angles; ///< Scratch buffer for block angles
93 unsigned angles_size;
94 AVFrame *ref; ///< Previous frame
95 int rx; ///< Maximum horizontal shift
96 int ry; ///< Maximum vertical shift
97 int edge; ///< Edge fill method
98 int blocksize; ///< Size of blocks to compare
99 int contrast; ///< Contrast threshold
100 int search; ///< Motion search method
101 av_pixelutils_sad_fn sad; ///< Sum of the absolute difference function
102 Transform last; ///< Transform from last frame
103 int refcount; ///< Number of reference frames (defines averaging window)
104 FILE *fp;
105 Transform avg;
106 int cw; ///< Crop motion search to this box
107 int ch;
108 int cx;
109 int cy;
110 char *filename; ///< Motion search detailed log filename
111 int opencl;
112 int (* transform)(AVFilterContext *ctx, int width, int height, int cw, int ch,
113 const float *matrix_y, const float *matrix_uv, enum InterpolateMethod interpolate,
114 enum FillMethod fill, AVFrame *in, AVFrame *out);
115 } DeshakeContext;
116
117 #define OFFSET(x) offsetof(DeshakeContext, x)
118 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
119
120 static const AVOption deshake_options[] = {
121 { "x", "set x for the rectangular search area", OFFSET(cx), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS },
122 { "y", "set y for the rectangular search area", OFFSET(cy), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS },
123 { "w", "set width for the rectangular search area", OFFSET(cw), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS },
124 { "h", "set height for the rectangular search area", OFFSET(ch), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS },
125 { "rx", "set x for the rectangular search area", OFFSET(rx), AV_OPT_TYPE_INT, {.i64=16}, 0, MAX_R, .flags = FLAGS },
126 { "ry", "set y for the rectangular search area", OFFSET(ry), AV_OPT_TYPE_INT, {.i64=16}, 0, MAX_R, .flags = FLAGS },
127 { "edge", "set edge mode", OFFSET(edge), AV_OPT_TYPE_INT, {.i64=FILL_MIRROR}, FILL_BLANK, FILL_COUNT-1, FLAGS, .unit = "edge"},
128 { "blank", "fill zeroes at blank locations", 0, AV_OPT_TYPE_CONST, {.i64=FILL_BLANK}, INT_MIN, INT_MAX, FLAGS, .unit = "edge" },
129 { "original", "original image at blank locations", 0, AV_OPT_TYPE_CONST, {.i64=FILL_ORIGINAL}, INT_MIN, INT_MAX, FLAGS, .unit = "edge" },
130 { "clamp", "extruded edge value at blank locations", 0, AV_OPT_TYPE_CONST, {.i64=FILL_CLAMP}, INT_MIN, INT_MAX, FLAGS, .unit = "edge" },
131 { "mirror", "mirrored edge at blank locations", 0, AV_OPT_TYPE_CONST, {.i64=FILL_MIRROR}, INT_MIN, INT_MAX, FLAGS, .unit = "edge" },
132 { "blocksize", "set motion search blocksize", OFFSET(blocksize), AV_OPT_TYPE_INT, {.i64=8}, 4, 128, .flags = FLAGS },
133 { "contrast", "set contrast threshold for blocks", OFFSET(contrast), AV_OPT_TYPE_INT, {.i64=125}, 1, 255, .flags = FLAGS },
134 { "search", "set search strategy", OFFSET(search), AV_OPT_TYPE_INT, {.i64=EXHAUSTIVE}, EXHAUSTIVE, SEARCH_COUNT-1, FLAGS, .unit = "smode" },
135 { "exhaustive", "exhaustive search", 0, AV_OPT_TYPE_CONST, {.i64=EXHAUSTIVE}, INT_MIN, INT_MAX, FLAGS, .unit = "smode" },
136 { "less", "less exhaustive search", 0, AV_OPT_TYPE_CONST, {.i64=SMART_EXHAUSTIVE}, INT_MIN, INT_MAX, FLAGS, .unit = "smode" },
137 { "filename", "set motion search detailed log file name", OFFSET(filename), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
138 { "opencl", "ignored", OFFSET(opencl), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, .flags = FLAGS },
139 { NULL }
140 };
141
142 AVFILTER_DEFINE_CLASS(deshake);
143
144 static int cmp(const void *a, const void *b)
145 {
146 return FFDIFFSIGN(*(const double *)a, *(const double *)b);
147 }
148
149 /**
150 * Cleaned mean (cuts off 20% of values to remove outliers and then averages)
151 */
152 static double clean_mean(double *values, int count)
153 {
154 double mean = 0;
155 int cut = count / 5;
156 int x;
157
158 AV_QSORT(values, count, double, cmp);
159
160 for (x = cut; x < count - cut; x++) {
161 mean += values[x];
162 }
163
164 return mean / (count - cut * 2);
165 }
166
167 /**
168 * Find the most likely shift in motion between two frames for a given
169 * macroblock. Test each block against several shifts given by the rx
170 * and ry attributes. Searches using a simple matrix of those shifts and
171 * chooses the most likely shift by the smallest difference in blocks.
172 */
173 static void find_block_motion(DeshakeContext *deshake, uint8_t *src1,
174 uint8_t *src2, int cx, int cy, int stride,
175 IntMotionVector *mv)
176 {
177 int x, y;
178 int diff;
179 int smallest = INT_MAX;
180 int tmp, tmp2;
181
182 #define CMP(i, j) deshake->sad(src1 + cy * stride + cx, stride,\
183 src2 + (j) * stride + (i), stride)
184
185 if (deshake->search == EXHAUSTIVE) {
186 // Compare every possible position - this is sloooow!
187 for (y = -deshake->ry; y <= deshake->ry; y++) {
188 for (x = -deshake->rx; x <= deshake->rx; x++) {
189 diff = CMP(cx - x, cy - y);
190 if (diff < smallest) {
191 smallest = diff;
192 mv->x = x;
193 mv->y = y;
194 }
195 }
196 }
197 } else if (deshake->search == SMART_EXHAUSTIVE) {
198 // Compare every other possible position and find the best match
199 for (y = -deshake->ry + 1; y < deshake->ry; y += 2) {
200 for (x = -deshake->rx + 1; x < deshake->rx; x += 2) {
201 diff = CMP(cx - x, cy - y);
202 if (diff < smallest) {
203 smallest = diff;
204 mv->x = x;
205 mv->y = y;
206 }
207 }
208 }
209
210 // Hone in on the specific best match around the match we found above
211 tmp = mv->x;
212 tmp2 = mv->y;
213
214 for (y = tmp2 - 1; y <= tmp2 + 1; y++) {
215 for (x = tmp - 1; x <= tmp + 1; x++) {
216 if (x == tmp && y == tmp2)
217 continue;
218
219 diff = CMP(cx - x, cy - y);
220 if (diff < smallest) {
221 smallest = diff;
222 mv->x = x;
223 mv->y = y;
224 }
225 }
226 }
227 }
228
229 if (smallest > 512) {
230 mv->x = -1;
231 mv->y = -1;
232 }
233 //av_log(NULL, AV_LOG_ERROR, "%d\n", smallest);
234 //av_log(NULL, AV_LOG_ERROR, "Final: (%d, %d) = %d x %d\n", cx, cy, mv->x, mv->y);
235 }
236
237 /**
238 * Find the contrast of a given block. When searching for global motion we
239 * really only care about the high contrast blocks, so using this method we
240 * can actually skip blocks we don't care much about.
241 */
242 static int block_contrast(uint8_t *src, int x, int y, int stride, int blocksize)
243 {
244 int highest = 0;
245 int lowest = 255;
246 int i, j, pos;
247
248 for (i = 0; i <= blocksize * 2; i++) {
249 // We use a width of 16 here to match the sad function
250 for (j = 0; j <= 15; j++) {
251 pos = (y + i) * stride + (x + j);
252 if (src[pos] < lowest)
253 lowest = src[pos];
254 else if (src[pos] > highest) {
255 highest = src[pos];
256 }
257 }
258 }
259
260 return highest - lowest;
261 }
262
263 /**
264 * Find the rotation for a given block.
265 */
266 static double block_angle(int x, int y, int cx, int cy, IntMotionVector *shift)
267 {
268 double a1, a2, diff;
269
270 a1 = atan2(y - cy, x - cx);
271 a2 = atan2(y - cy + shift->y, x - cx + shift->x);
272
273 diff = a2 - a1;
274
275 return (diff > M_PI) ? diff - 2 * M_PI :
276 (diff < -M_PI) ? diff + 2 * M_PI :
277 diff;
278 }
279
280 /**
281 * Find the estimated global motion for a scene given the most likely shift
282 * for each block in the frame. The global motion is estimated to be the
283 * same as the motion from most blocks in the frame, so if most blocks
284 * move one pixel to the right and two pixels down, this would yield a
285 * motion vector (1, -2).
286 */
287 static void find_motion(DeshakeContext *deshake, uint8_t *src1, uint8_t *src2,
288 int width, int height, int stride, Transform *t)
289 {
290 int x, y;
291 IntMotionVector mv = {0, 0};
292 int count_max_value = 0;
293 int contrast;
294
295 int pos;
296 int center_x = 0, center_y = 0;
297 double p_x, p_y;
298
299 av_fast_malloc(&deshake->angles, &deshake->angles_size, width * height / (16 * deshake->blocksize) * sizeof(*deshake->angles));
300
301 // Reset counts to zero
302 for (x = 0; x < deshake->rx * 2 + 1; x++) {
303 for (y = 0; y < deshake->ry * 2 + 1; y++) {
304 deshake->counts[x][y] = 0;
305 }
306 }
307
308 pos = 0;
309 // Find motion for every block and store the motion vector in the counts
310 for (y = deshake->ry; y < height - deshake->ry - (deshake->blocksize * 2); y += deshake->blocksize * 2) {
311 // We use a width of 16 here to match the sad function
312 for (x = deshake->rx; x < width - deshake->rx - 16; x += 16) {
313 // If the contrast is too low, just skip this block as it probably
314 // won't be very useful to us.
315 contrast = block_contrast(src2, x, y, stride, deshake->blocksize);
316 if (contrast > deshake->contrast) {
317 //av_log(NULL, AV_LOG_ERROR, "%d\n", contrast);
318 find_block_motion(deshake, src1, src2, x, y, stride, &mv);
319 if (mv.x != -1 && mv.y != -1) {
320 deshake->counts[mv.x + deshake->rx][mv.y + deshake->ry] += 1;
321 if (x > deshake->rx && y > deshake->ry)
322 deshake->angles[pos++] = block_angle(x, y, 0, 0, &mv);
323
324 center_x += mv.x;
325 center_y += mv.y;
326 }
327 }
328 }
329 }
330
331 if (pos) {
332 center_x /= pos;
333 center_y /= pos;
334 t->angle = clean_mean(deshake->angles, pos);
335 if (t->angle < 0.001)
336 t->angle = 0;
337 } else {
338 t->angle = 0;
339 }
340
341 // Find the most common motion vector in the frame and use it as the gmv
342 for (y = deshake->ry * 2; y >= 0; y--) {
343 for (x = 0; x < deshake->rx * 2 + 1; x++) {
344 //av_log(NULL, AV_LOG_ERROR, "%5d ", deshake->counts[x][y]);
345 if (deshake->counts[x][y] > count_max_value) {
346 t->vec.x = x - deshake->rx;
347 t->vec.y = y - deshake->ry;
348 count_max_value = deshake->counts[x][y];
349 }
350 }
351 //av_log(NULL, AV_LOG_ERROR, "\n");
352 }
353
354 p_x = (center_x - width / 2.0);
355 p_y = (center_y - height / 2.0);
356 t->vec.x += (cos(t->angle)-1)*p_x - sin(t->angle)*p_y;
357 t->vec.y += sin(t->angle)*p_x + (cos(t->angle)-1)*p_y;
358
359 // Clamp max shift & rotation?
360 t->vec.x = av_clipf(t->vec.x, -deshake->rx * 2, deshake->rx * 2);
361 t->vec.y = av_clipf(t->vec.y, -deshake->ry * 2, deshake->ry * 2);
362 t->angle = av_clipf(t->angle, -0.1, 0.1);
363
364 //av_log(NULL, AV_LOG_ERROR, "%d x %d\n", avg->x, avg->y);
365 }
366
367 static int deshake_transform_c(AVFilterContext *ctx,
368 int width, int height, int cw, int ch,
369 const float *matrix_y, const float *matrix_uv,
370 enum InterpolateMethod interpolate,
371 enum FillMethod fill, AVFrame *in, AVFrame *out)
372 {
373 int i = 0, ret = 0;
374 const float *matrixs[3];
375 int plane_w[3], plane_h[3];
376 matrixs[0] = matrix_y;
377 matrixs[1] = matrixs[2] = matrix_uv;
378 plane_w[0] = width;
379 plane_w[1] = plane_w[2] = cw;
380 plane_h[0] = height;
381 plane_h[1] = plane_h[2] = ch;
382
383 for (i = 0; i < 3; i++) {
384 // Transform the luma and chroma planes
385 ret = ff_affine_transform(in->data[i], out->data[i], in->linesize[i],
386 out->linesize[i], plane_w[i], plane_h[i],
387 matrixs[i], interpolate, fill);
388 if (ret < 0)
389 return ret;
390 }
391 return ret;
392 }
393
394 static av_cold int init(AVFilterContext *ctx)
395 {
396 DeshakeContext *deshake = ctx->priv;
397
398 deshake->refcount = 20; // XXX: add to options?
399 deshake->blocksize /= 2;
400 deshake->blocksize = av_clip(deshake->blocksize, 4, 128);
401
402 if (deshake->rx % 16) {
403 av_log(ctx, AV_LOG_ERROR, "rx must be a multiple of 16\n");
404 return AVERROR_PATCHWELCOME;
405 }
406
407 if (deshake->filename)
408 deshake->fp = avpriv_fopen_utf8(deshake->filename, "w");
409 if (deshake->fp)
410 fwrite("Ori x, Avg x, Fin x, Ori y, Avg y, Fin y, Ori angle, Avg angle, Fin angle, Ori zoom, Avg zoom, Fin zoom\n", 1, 104, deshake->fp);
411
412 // Quadword align left edge of box for MMX code, adjust width if necessary
413 // to keep right margin
414 if (deshake->cx > 0) {
415 deshake->cw += deshake->cx - (deshake->cx & ~15);
416 deshake->cx &= ~15;
417 }
418 deshake->transform = deshake_transform_c;
419
420 av_log(ctx, AV_LOG_VERBOSE, "cx: %d, cy: %d, cw: %d, ch: %d, rx: %d, ry: %d, edge: %d blocksize: %d contrast: %d search: %d\n",
421 deshake->cx, deshake->cy, deshake->cw, deshake->ch,
422 deshake->rx, deshake->ry, deshake->edge, deshake->blocksize * 2, deshake->contrast, deshake->search);
423
424 return 0;
425 }
426
427 static const enum AVPixelFormat pix_fmts[] = {
428 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV410P,
429 AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
430 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_NONE
431 };
432
433 static int config_props(AVFilterLink *link)
434 {
435 DeshakeContext *deshake = link->dst->priv;
436
437 deshake->ref = NULL;
438 deshake->last.vec.x = 0;
439 deshake->last.vec.y = 0;
440 deshake->last.angle = 0;
441 deshake->last.zoom = 0;
442
443 return 0;
444 }
445
446 static av_cold void uninit(AVFilterContext *ctx)
447 {
448 DeshakeContext *deshake = ctx->priv;
449 av_frame_free(&deshake->ref);
450 av_freep(&deshake->angles);
451 deshake->angles_size = 0;
452 if (deshake->fp)
453 fclose(deshake->fp);
454 }
455
456 static int filter_frame(AVFilterLink *link, AVFrame *in)
457 {
458 DeshakeContext *deshake = link->dst->priv;
459 AVFilterLink *outlink = link->dst->outputs[0];
460 AVFrame *out;
461 Transform t = {{0},0}, orig = {{0},0};
462 float matrix_y[9], matrix_uv[9];
463 float alpha = 2.0 / deshake->refcount;
464 char tmp[256];
465 int ret = 0;
466 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
467 const int chroma_width = AV_CEIL_RSHIFT(link->w, desc->log2_chroma_w);
468 const int chroma_height = AV_CEIL_RSHIFT(link->h, desc->log2_chroma_h);
469 int aligned;
470 float transform_zoom;
471
472 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
473 if (!out) {
474 av_frame_free(&in);
475 return AVERROR(ENOMEM);
476 }
477 av_frame_copy_props(out, in);
478
479 aligned = !((intptr_t)in->data[0] & 15 | in->linesize[0] & 15);
480 deshake->sad = av_pixelutils_get_sad_fn(4, 4, aligned, deshake); // 16x16, 2nd source unaligned
481 if (!deshake->sad)
482 return AVERROR(EINVAL);
483
484 if (deshake->cx < 0 || deshake->cy < 0 || deshake->cw < 0 || deshake->ch < 0) {
485 // Find the most likely global motion for the current frame
486 find_motion(deshake, (deshake->ref == NULL) ? in->data[0] : deshake->ref->data[0], in->data[0], link->w, link->h, in->linesize[0], &t);
487 } else {
488 uint8_t *src1 = (deshake->ref == NULL) ? in->data[0] : deshake->ref->data[0];
489 uint8_t *src2 = in->data[0];
490
491 deshake->cx = FFMIN(deshake->cx, link->w);
492 deshake->cy = FFMIN(deshake->cy, link->h);
493
494 if ((unsigned)deshake->cx + (unsigned)deshake->cw > link->w) deshake->cw = link->w - deshake->cx;
495 if ((unsigned)deshake->cy + (unsigned)deshake->ch > link->h) deshake->ch = link->h - deshake->cy;
496
497 // Quadword align right margin
498 deshake->cw &= ~15;
499
500 src1 += deshake->cy * in->linesize[0] + deshake->cx;
501 src2 += deshake->cy * in->linesize[0] + deshake->cx;
502
503 find_motion(deshake, src1, src2, deshake->cw, deshake->ch, in->linesize[0], &t);
504 }
505
506
507 // Copy transform so we can output it later to compare to the smoothed value
508 orig.vec.x = t.vec.x;
509 orig.vec.y = t.vec.y;
510 orig.angle = t.angle;
511 orig.zoom = t.zoom;
512
513 // Generate a one-sided moving exponential average
514 deshake->avg.vec.x = alpha * t.vec.x + (1.0 - alpha) * deshake->avg.vec.x;
515 deshake->avg.vec.y = alpha * t.vec.y + (1.0 - alpha) * deshake->avg.vec.y;
516 deshake->avg.angle = alpha * t.angle + (1.0 - alpha) * deshake->avg.angle;
517 deshake->avg.zoom = alpha * t.zoom + (1.0 - alpha) * deshake->avg.zoom;
518
519 // Remove the average from the current motion to detect the motion that
520 // is not on purpose, just as jitter from bumping the camera
521 t.vec.x -= deshake->avg.vec.x;
522 t.vec.y -= deshake->avg.vec.y;
523 t.angle -= deshake->avg.angle;
524 t.zoom -= deshake->avg.zoom;
525
526 // Invert the motion to undo it
527 t.vec.x *= -1;
528 t.vec.y *= -1;
529 t.angle *= -1;
530
531 // Write statistics to file
532 if (deshake->fp) {
533 snprintf(tmp, 256, "%f, %f, %f, %f, %f, %f, %f, %f, %f, %f, %f, %f\n", orig.vec.x, deshake->avg.vec.x, t.vec.x, orig.vec.y, deshake->avg.vec.y, t.vec.y, orig.angle, deshake->avg.angle, t.angle, orig.zoom, deshake->avg.zoom, t.zoom);
534 fwrite(tmp, 1, strlen(tmp), deshake->fp);
535 }
536
537 // Turn relative current frame motion into absolute by adding it to the
538 // last absolute motion
539 t.vec.x += deshake->last.vec.x;
540 t.vec.y += deshake->last.vec.y;
541 t.angle += deshake->last.angle;
542 t.zoom += deshake->last.zoom;
543
544 // Shrink motion by 10% to keep things centered in the camera frame
545 t.vec.x *= 0.9;
546 t.vec.y *= 0.9;
547 t.angle *= 0.9;
548
549 // Store the last absolute motion information
550 deshake->last.vec.x = t.vec.x;
551 deshake->last.vec.y = t.vec.y;
552 deshake->last.angle = t.angle;
553 deshake->last.zoom = t.zoom;
554
555 transform_zoom = 1.0 + t.zoom / 100.0;
556
557 // Generate a luma transformation matrix
558 ff_get_matrix(t.vec.x, t.vec.y, t.angle, transform_zoom, transform_zoom, matrix_y);
559 // Generate a chroma transformation matrix
560 ff_get_matrix(t.vec.x / (link->w / chroma_width), t.vec.y / (link->h / chroma_height), t.angle, transform_zoom, transform_zoom, matrix_uv);
561 // Transform the luma and chroma planes
562 ret = deshake->transform(link->dst, link->w, link->h, chroma_width, chroma_height,
563 matrix_y, matrix_uv, INTERPOLATE_BILINEAR, deshake->edge, in, out);
564
565 // Cleanup the old reference frame
566 av_frame_free(&deshake->ref);
567
568 if (ret < 0)
569 goto fail;
570
571 // Store the current frame as the reference frame for calculating the
572 // motion of the next frame
573 deshake->ref = in;
574
575 return ff_filter_frame(outlink, out);
576 fail:
577 av_frame_free(&out);
578 return ret;
579 }
580
581 static const AVFilterPad deshake_inputs[] = {
582 {
583 .name = "default",
584 .type = AVMEDIA_TYPE_VIDEO,
585 .filter_frame = filter_frame,
586 .config_props = config_props,
587 },
588 };
589
590 const AVFilter ff_vf_deshake = {
591 .name = "deshake",
592 .description = NULL_IF_CONFIG_SMALL("Stabilize shaky video."),
593 .priv_size = sizeof(DeshakeContext),
594 .init = init,
595 .uninit = uninit,
596 FILTER_INPUTS(deshake_inputs),
597 FILTER_OUTPUTS(ff_video_default_filterpad),
598 FILTER_PIXFMTS_ARRAY(pix_fmts),
599 .priv_class = &deshake_class,
600 };
601