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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 "formats.h" | |
54 | #include "internal.h" | |
55 | #include "video.h" | |
56 | #include "libavutil/common.h" | |
57 | #include "libavutil/mem.h" | |
58 | #include "libavutil/opt.h" | |
59 | #include "libavutil/pixdesc.h" | |
60 | ||
61 | #include "deshake.h" | |
62 | #include "deshake_opencl.h" | |
63 | ||
64 | #define CHROMA_WIDTH(link) (-((-(link)->w) >> av_pix_fmt_desc_get((link)->format)->log2_chroma_w)) | |
65 | #define CHROMA_HEIGHT(link) (-((-(link)->h) >> av_pix_fmt_desc_get((link)->format)->log2_chroma_h)) | |
66 | ||
67 | #define OFFSET(x) offsetof(DeshakeContext, x) | |
68 | #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM | |
69 | ||
70 | static const AVOption deshake_options[] = { | |
71 | { "x", "set x for the rectangular search area", OFFSET(cx), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS }, | |
72 | { "y", "set y for the rectangular search area", OFFSET(cy), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS }, | |
73 | { "w", "set width for the rectangular search area", OFFSET(cw), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS }, | |
74 | { "h", "set height for the rectangular search area", OFFSET(ch), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS }, | |
75 | { "rx", "set x for the rectangular search area", OFFSET(rx), AV_OPT_TYPE_INT, {.i64=16}, 0, MAX_R, .flags = FLAGS }, | |
76 | { "ry", "set y for the rectangular search area", OFFSET(ry), AV_OPT_TYPE_INT, {.i64=16}, 0, MAX_R, .flags = FLAGS }, | |
77 | { "edge", "set edge mode", OFFSET(edge), AV_OPT_TYPE_INT, {.i64=FILL_MIRROR}, FILL_BLANK, FILL_COUNT-1, FLAGS, "edge"}, | |
78 | { "blank", "fill zeroes at blank locations", 0, AV_OPT_TYPE_CONST, {.i64=FILL_BLANK}, INT_MIN, INT_MAX, FLAGS, "edge" }, | |
79 | { "original", "original image at blank locations", 0, AV_OPT_TYPE_CONST, {.i64=FILL_ORIGINAL}, INT_MIN, INT_MAX, FLAGS, "edge" }, | |
80 | { "clamp", "extruded edge value at blank locations", 0, AV_OPT_TYPE_CONST, {.i64=FILL_CLAMP}, INT_MIN, INT_MAX, FLAGS, "edge" }, | |
81 | { "mirror", "mirrored edge at blank locations", 0, AV_OPT_TYPE_CONST, {.i64=FILL_MIRROR}, INT_MIN, INT_MAX, FLAGS, "edge" }, | |
82 | { "blocksize", "set motion search blocksize", OFFSET(blocksize), AV_OPT_TYPE_INT, {.i64=8}, 4, 128, .flags = FLAGS }, | |
83 | { "contrast", "set contrast threshold for blocks", OFFSET(contrast), AV_OPT_TYPE_INT, {.i64=125}, 1, 255, .flags = FLAGS }, | |
84 | { "search", "set search strategy", OFFSET(search), AV_OPT_TYPE_INT, {.i64=EXHAUSTIVE}, EXHAUSTIVE, SEARCH_COUNT-1, FLAGS, "smode" }, | |
85 | { "exhaustive", "exhaustive search", 0, AV_OPT_TYPE_CONST, {.i64=EXHAUSTIVE}, INT_MIN, INT_MAX, FLAGS, "smode" }, | |
86 | { "less", "less exhaustive search", 0, AV_OPT_TYPE_CONST, {.i64=SMART_EXHAUSTIVE}, INT_MIN, INT_MAX, FLAGS, "smode" }, | |
87 | { "filename", "set motion search detailed log file name", OFFSET(filename), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS }, | |
88 | { "opencl", "use OpenCL filtering capabilities", OFFSET(opencl), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, .flags = FLAGS }, | |
89 | { NULL } | |
90 | }; | |
91 | ||
92 | AVFILTER_DEFINE_CLASS(deshake); | |
93 | ||
94 | static int cmp(const double *a, const double *b) | |
95 | { | |
96 | return *a < *b ? -1 : ( *a > *b ? 1 : 0 ); | |
97 | } | |
98 | ||
99 | /** | |
100 | * Cleaned mean (cuts off 20% of values to remove outliers and then averages) | |
101 | */ | |
102 | static double clean_mean(double *values, int count) | |
103 | { | |
104 | double mean = 0; | |
105 | int cut = count / 5; | |
106 | int x; | |
107 | ||
108 | qsort(values, count, sizeof(double), (void*)cmp); | |
109 | ||
110 | for (x = cut; x < count - cut; x++) { | |
111 | mean += values[x]; | |
112 | } | |
113 | ||
114 | return mean / (count - cut * 2); | |
115 | } | |
116 | ||
117 | /** | |
118 | * Find the most likely shift in motion between two frames for a given | |
119 | * macroblock. Test each block against several shifts given by the rx | |
120 | * and ry attributes. Searches using a simple matrix of those shifts and | |
121 | * chooses the most likely shift by the smallest difference in blocks. | |
122 | */ | |
123 | static void find_block_motion(DeshakeContext *deshake, uint8_t *src1, | |
124 | uint8_t *src2, int cx, int cy, int stride, | |
125 | IntMotionVector *mv) | |
126 | { | |
127 | int x, y; | |
128 | int diff; | |
129 | int smallest = INT_MAX; | |
130 | int tmp, tmp2; | |
131 | ||
132 | #define CMP(i, j) deshake->sad(src1 + cy * stride + cx, stride,\ | |
133 | src2 + (j) * stride + (i), stride) | |
134 | ||
135 | if (deshake->search == EXHAUSTIVE) { | |
136 | // Compare every possible position - this is sloooow! | |
137 | for (y = -deshake->ry; y <= deshake->ry; y++) { | |
138 | for (x = -deshake->rx; x <= deshake->rx; x++) { | |
139 | diff = CMP(cx - x, cy - y); | |
140 | if (diff < smallest) { | |
141 | smallest = diff; | |
142 | mv->x = x; | |
143 | mv->y = y; | |
144 | } | |
145 | } | |
146 | } | |
147 | } else if (deshake->search == SMART_EXHAUSTIVE) { | |
148 | // Compare every other possible position and find the best match | |
149 | for (y = -deshake->ry + 1; y < deshake->ry; y += 2) { | |
150 | for (x = -deshake->rx + 1; x < deshake->rx; x += 2) { | |
151 | diff = CMP(cx - x, cy - y); | |
152 | if (diff < smallest) { | |
153 | smallest = diff; | |
154 | mv->x = x; | |
155 | mv->y = y; | |
156 | } | |
157 | } | |
158 | } | |
159 | ||
160 | // Hone in on the specific best match around the match we found above | |
161 | tmp = mv->x; | |
162 | tmp2 = mv->y; | |
163 | ||
164 | for (y = tmp2 - 1; y <= tmp2 + 1; y++) { | |
165 | for (x = tmp - 1; x <= tmp + 1; x++) { | |
166 | if (x == tmp && y == tmp2) | |
167 | continue; | |
168 | ||
169 | diff = CMP(cx - x, cy - y); | |
170 | if (diff < smallest) { | |
171 | smallest = diff; | |
172 | mv->x = x; | |
173 | mv->y = y; | |
174 | } | |
175 | } | |
176 | } | |
177 | } | |
178 | ||
179 | if (smallest > 512) { | |
180 | mv->x = -1; | |
181 | mv->y = -1; | |
182 | } | |
183 | emms_c(); | |
184 | //av_log(NULL, AV_LOG_ERROR, "%d\n", smallest); | |
185 | //av_log(NULL, AV_LOG_ERROR, "Final: (%d, %d) = %d x %d\n", cx, cy, mv->x, mv->y); | |
186 | } | |
187 | ||
188 | /** | |
189 | * Find the contrast of a given block. When searching for global motion we | |
190 | * really only care about the high contrast blocks, so using this method we | |
191 | * can actually skip blocks we don't care much about. | |
192 | */ | |
193 | static int block_contrast(uint8_t *src, int x, int y, int stride, int blocksize) | |
194 | { | |
195 | int highest = 0; | |
196 | int lowest = 255; | |
197 | int i, j, pos; | |
198 | ||
199 | for (i = 0; i <= blocksize * 2; i++) { | |
200 | // We use a width of 16 here to match the sad function | |
201 | for (j = 0; j <= 15; j++) { | |
202 | pos = (y - i) * stride + (x - j); | |
203 | if (src[pos] < lowest) | |
204 | lowest = src[pos]; | |
205 | else if (src[pos] > highest) { | |
206 | highest = src[pos]; | |
207 | } | |
208 | } | |
209 | } | |
210 | ||
211 | return highest - lowest; | |
212 | } | |
213 | ||
214 | /** | |
215 | * Find the rotation for a given block. | |
216 | */ | |
217 | static double block_angle(int x, int y, int cx, int cy, IntMotionVector *shift) | |
218 | { | |
219 | double a1, a2, diff; | |
220 | ||
221 | a1 = atan2(y - cy, x - cx); | |
222 | a2 = atan2(y - cy + shift->y, x - cx + shift->x); | |
223 | ||
224 | diff = a2 - a1; | |
225 | ||
226 | return (diff > M_PI) ? diff - 2 * M_PI : | |
227 | (diff < -M_PI) ? diff + 2 * M_PI : | |
228 | diff; | |
229 | } | |
230 | ||
231 | /** | |
232 | * Find the estimated global motion for a scene given the most likely shift | |
233 | * for each block in the frame. The global motion is estimated to be the | |
234 | * same as the motion from most blocks in the frame, so if most blocks | |
235 | * move one pixel to the right and two pixels down, this would yield a | |
236 | * motion vector (1, -2). | |
237 | */ | |
238 | static void find_motion(DeshakeContext *deshake, uint8_t *src1, uint8_t *src2, | |
239 | int width, int height, int stride, Transform *t) | |
240 | { | |
241 | int x, y; | |
242 | IntMotionVector mv = {0, 0}; | |
243 | int count_max_value = 0; | |
244 | int contrast; | |
245 | ||
246 | int pos; | |
247 | int center_x = 0, center_y = 0; | |
248 | double p_x, p_y; | |
249 | ||
250 | av_fast_malloc(&deshake->angles, &deshake->angles_size, width * height / (16 * deshake->blocksize) * sizeof(*deshake->angles)); | |
251 | ||
252 | // Reset counts to zero | |
253 | for (x = 0; x < deshake->rx * 2 + 1; x++) { | |
254 | for (y = 0; y < deshake->ry * 2 + 1; y++) { | |
255 | deshake->counts[x][y] = 0; | |
256 | } | |
257 | } | |
258 | ||
259 | pos = 0; | |
260 | // Find motion for every block and store the motion vector in the counts | |
261 | for (y = deshake->ry; y < height - deshake->ry - (deshake->blocksize * 2); y += deshake->blocksize * 2) { | |
262 | // We use a width of 16 here to match the sad function | |
263 | for (x = deshake->rx; x < width - deshake->rx - 16; x += 16) { | |
264 | // If the contrast is too low, just skip this block as it probably | |
265 | // won't be very useful to us. | |
266 | contrast = block_contrast(src2, x, y, stride, deshake->blocksize); | |
267 | if (contrast > deshake->contrast) { | |
268 | //av_log(NULL, AV_LOG_ERROR, "%d\n", contrast); | |
269 | find_block_motion(deshake, src1, src2, x, y, stride, &mv); | |
270 | if (mv.x != -1 && mv.y != -1) { | |
271 | deshake->counts[mv.x + deshake->rx][mv.y + deshake->ry] += 1; | |
272 | if (x > deshake->rx && y > deshake->ry) | |
273 | deshake->angles[pos++] = block_angle(x, y, 0, 0, &mv); | |
274 | ||
275 | center_x += mv.x; | |
276 | center_y += mv.y; | |
277 | } | |
278 | } | |
279 | } | |
280 | } | |
281 | ||
282 | if (pos) { | |
283 | center_x /= pos; | |
284 | center_y /= pos; | |
285 | t->angle = clean_mean(deshake->angles, pos); | |
286 | if (t->angle < 0.001) | |
287 | t->angle = 0; | |
288 | } else { | |
289 | t->angle = 0; | |
290 | } | |
291 | ||
292 | // Find the most common motion vector in the frame and use it as the gmv | |
293 | for (y = deshake->ry * 2; y >= 0; y--) { | |
294 | for (x = 0; x < deshake->rx * 2 + 1; x++) { | |
295 | //av_log(NULL, AV_LOG_ERROR, "%5d ", deshake->counts[x][y]); | |
296 | if (deshake->counts[x][y] > count_max_value) { | |
297 | t->vec.x = x - deshake->rx; | |
298 | t->vec.y = y - deshake->ry; | |
299 | count_max_value = deshake->counts[x][y]; | |
300 | } | |
301 | } | |
302 | //av_log(NULL, AV_LOG_ERROR, "\n"); | |
303 | } | |
304 | ||
305 | p_x = (center_x - width / 2.0); | |
306 | p_y = (center_y - height / 2.0); | |
307 | t->vec.x += (cos(t->angle)-1)*p_x - sin(t->angle)*p_y; | |
308 | t->vec.y += sin(t->angle)*p_x + (cos(t->angle)-1)*p_y; | |
309 | ||
310 | // Clamp max shift & rotation? | |
311 | t->vec.x = av_clipf(t->vec.x, -deshake->rx * 2, deshake->rx * 2); | |
312 | t->vec.y = av_clipf(t->vec.y, -deshake->ry * 2, deshake->ry * 2); | |
313 | t->angle = av_clipf(t->angle, -0.1, 0.1); | |
314 | ||
315 | //av_log(NULL, AV_LOG_ERROR, "%d x %d\n", avg->x, avg->y); | |
316 | } | |
317 | ||
318 | static int deshake_transform_c(AVFilterContext *ctx, | |
319 | int width, int height, int cw, int ch, | |
320 | const float *matrix_y, const float *matrix_uv, | |
321 | enum InterpolateMethod interpolate, | |
322 | enum FillMethod fill, AVFrame *in, AVFrame *out) | |
323 | { | |
324 | int i = 0, ret = 0; | |
325 | const float *matrixs[3]; | |
326 | int plane_w[3], plane_h[3]; | |
327 | matrixs[0] = matrix_y; | |
328 | matrixs[1] = matrixs[2] = matrix_uv; | |
329 | plane_w[0] = width; | |
330 | plane_w[1] = plane_w[2] = cw; | |
331 | plane_h[0] = height; | |
332 | plane_h[1] = plane_h[2] = ch; | |
333 | ||
334 | for (i = 0; i < 3; i++) { | |
335 | // Transform the luma and chroma planes | |
336 | ret = avfilter_transform(in->data[i], out->data[i], in->linesize[i], out->linesize[i], | |
337 | plane_w[i], plane_h[i], matrixs[i], interpolate, fill); | |
338 | if (ret < 0) | |
339 | return ret; | |
340 | } | |
341 | return ret; | |
342 | } | |
343 | ||
344 | static av_cold int init(AVFilterContext *ctx) | |
345 | { | |
346 | int ret; | |
347 | DeshakeContext *deshake = ctx->priv; | |
348 | ||
349 | deshake->sad = av_pixelutils_get_sad_fn(4, 4, 1, deshake); // 16x16, 2nd source unaligned | |
350 | if (!deshake->sad) | |
351 | return AVERROR(EINVAL); | |
352 | ||
353 | deshake->refcount = 20; // XXX: add to options? | |
354 | deshake->blocksize /= 2; | |
355 | deshake->blocksize = av_clip(deshake->blocksize, 4, 128); | |
356 | ||
357 | if (deshake->rx % 16) { | |
358 | av_log(ctx, AV_LOG_ERROR, "rx must be a multiple of 16\n"); | |
359 | return AVERROR_PATCHWELCOME; | |
360 | } | |
361 | ||
362 | if (deshake->filename) | |
363 | deshake->fp = fopen(deshake->filename, "w"); | |
364 | if (deshake->fp) | |
365 | 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", sizeof(char), 104, deshake->fp); | |
366 | ||
367 | // Quadword align left edge of box for MMX code, adjust width if necessary | |
368 | // to keep right margin | |
369 | if (deshake->cx > 0) { | |
370 | deshake->cw += deshake->cx - (deshake->cx & ~15); | |
371 | deshake->cx &= ~15; | |
372 | } | |
373 | deshake->transform = deshake_transform_c; | |
374 | if (!CONFIG_OPENCL && deshake->opencl) { | |
375 | av_log(ctx, AV_LOG_ERROR, "OpenCL support was not enabled in this build, cannot be selected\n"); | |
376 | return AVERROR(EINVAL); | |
377 | } | |
378 | ||
379 | if (CONFIG_OPENCL && deshake->opencl) { | |
380 | deshake->transform = ff_opencl_transform; | |
381 | ret = ff_opencl_deshake_init(ctx); | |
382 | if (ret < 0) | |
383 | return ret; | |
384 | } | |
385 | 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", | |
386 | deshake->cx, deshake->cy, deshake->cw, deshake->ch, | |
387 | deshake->rx, deshake->ry, deshake->edge, deshake->blocksize * 2, deshake->contrast, deshake->search); | |
388 | ||
389 | return 0; | |
390 | } | |
391 | ||
392 | static int query_formats(AVFilterContext *ctx) | |
393 | { | |
394 | static const enum AVPixelFormat pix_fmts[] = { | |
395 | AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV410P, | |
396 | AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, | |
397 | AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_NONE | |
398 | }; | |
399 | ||
400 | ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); | |
401 | ||
402 | return 0; | |
403 | } | |
404 | ||
405 | static int config_props(AVFilterLink *link) | |
406 | { | |
407 | DeshakeContext *deshake = link->dst->priv; | |
408 | ||
409 | deshake->ref = NULL; | |
410 | deshake->last.vec.x = 0; | |
411 | deshake->last.vec.y = 0; | |
412 | deshake->last.angle = 0; | |
413 | deshake->last.zoom = 0; | |
414 | ||
415 | return 0; | |
416 | } | |
417 | ||
418 | static av_cold void uninit(AVFilterContext *ctx) | |
419 | { | |
420 | DeshakeContext *deshake = ctx->priv; | |
421 | if (CONFIG_OPENCL && deshake->opencl) { | |
422 | ff_opencl_deshake_uninit(ctx); | |
423 | } | |
424 | av_frame_free(&deshake->ref); | |
425 | av_freep(&deshake->angles); | |
426 | deshake->angles_size = 0; | |
427 | if (deshake->fp) | |
428 | fclose(deshake->fp); | |
429 | } | |
430 | ||
431 | static int filter_frame(AVFilterLink *link, AVFrame *in) | |
432 | { | |
433 | DeshakeContext *deshake = link->dst->priv; | |
434 | AVFilterLink *outlink = link->dst->outputs[0]; | |
435 | AVFrame *out; | |
436 | Transform t = {{0},0}, orig = {{0},0}; | |
437 | float matrix_y[9], matrix_uv[9]; | |
438 | float alpha = 2.0 / deshake->refcount; | |
439 | char tmp[256]; | |
440 | int ret = 0; | |
441 | ||
442 | out = ff_get_video_buffer(outlink, outlink->w, outlink->h); | |
443 | if (!out) { | |
444 | av_frame_free(&in); | |
445 | return AVERROR(ENOMEM); | |
446 | } | |
447 | av_frame_copy_props(out, in); | |
448 | ||
449 | if (CONFIG_OPENCL && deshake->opencl) { | |
450 | ret = ff_opencl_deshake_process_inout_buf(link->dst,in, out); | |
451 | if (ret < 0) | |
452 | return ret; | |
453 | } | |
454 | ||
455 | if (deshake->cx < 0 || deshake->cy < 0 || deshake->cw < 0 || deshake->ch < 0) { | |
456 | // Find the most likely global motion for the current frame | |
457 | find_motion(deshake, (deshake->ref == NULL) ? in->data[0] : deshake->ref->data[0], in->data[0], link->w, link->h, in->linesize[0], &t); | |
458 | } else { | |
459 | uint8_t *src1 = (deshake->ref == NULL) ? in->data[0] : deshake->ref->data[0]; | |
460 | uint8_t *src2 = in->data[0]; | |
461 | ||
462 | deshake->cx = FFMIN(deshake->cx, link->w); | |
463 | deshake->cy = FFMIN(deshake->cy, link->h); | |
464 | ||
465 | if ((unsigned)deshake->cx + (unsigned)deshake->cw > link->w) deshake->cw = link->w - deshake->cx; | |
466 | if ((unsigned)deshake->cy + (unsigned)deshake->ch > link->h) deshake->ch = link->h - deshake->cy; | |
467 | ||
468 | // Quadword align right margin | |
469 | deshake->cw &= ~15; | |
470 | ||
471 | src1 += deshake->cy * in->linesize[0] + deshake->cx; | |
472 | src2 += deshake->cy * in->linesize[0] + deshake->cx; | |
473 | ||
474 | find_motion(deshake, src1, src2, deshake->cw, deshake->ch, in->linesize[0], &t); | |
475 | } | |
476 | ||
477 | ||
478 | // Copy transform so we can output it later to compare to the smoothed value | |
479 | orig.vec.x = t.vec.x; | |
480 | orig.vec.y = t.vec.y; | |
481 | orig.angle = t.angle; | |
482 | orig.zoom = t.zoom; | |
483 | ||
484 | // Generate a one-sided moving exponential average | |
485 | deshake->avg.vec.x = alpha * t.vec.x + (1.0 - alpha) * deshake->avg.vec.x; | |
486 | deshake->avg.vec.y = alpha * t.vec.y + (1.0 - alpha) * deshake->avg.vec.y; | |
487 | deshake->avg.angle = alpha * t.angle + (1.0 - alpha) * deshake->avg.angle; | |
488 | deshake->avg.zoom = alpha * t.zoom + (1.0 - alpha) * deshake->avg.zoom; | |
489 | ||
490 | // Remove the average from the current motion to detect the motion that | |
491 | // is not on purpose, just as jitter from bumping the camera | |
492 | t.vec.x -= deshake->avg.vec.x; | |
493 | t.vec.y -= deshake->avg.vec.y; | |
494 | t.angle -= deshake->avg.angle; | |
495 | t.zoom -= deshake->avg.zoom; | |
496 | ||
497 | // Invert the motion to undo it | |
498 | t.vec.x *= -1; | |
499 | t.vec.y *= -1; | |
500 | t.angle *= -1; | |
501 | ||
502 | // Write statistics to file | |
503 | if (deshake->fp) { | |
504 | 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); | |
505 | fwrite(tmp, sizeof(char), strlen(tmp), deshake->fp); | |
506 | } | |
507 | ||
508 | // Turn relative current frame motion into absolute by adding it to the | |
509 | // last absolute motion | |
510 | t.vec.x += deshake->last.vec.x; | |
511 | t.vec.y += deshake->last.vec.y; | |
512 | t.angle += deshake->last.angle; | |
513 | t.zoom += deshake->last.zoom; | |
514 | ||
515 | // Shrink motion by 10% to keep things centered in the camera frame | |
516 | t.vec.x *= 0.9; | |
517 | t.vec.y *= 0.9; | |
518 | t.angle *= 0.9; | |
519 | ||
520 | // Store the last absolute motion information | |
521 | deshake->last.vec.x = t.vec.x; | |
522 | deshake->last.vec.y = t.vec.y; | |
523 | deshake->last.angle = t.angle; | |
524 | deshake->last.zoom = t.zoom; | |
525 | ||
526 | // Generate a luma transformation matrix | |
527 | avfilter_get_matrix(t.vec.x, t.vec.y, t.angle, 1.0 + t.zoom / 100.0, matrix_y); | |
528 | // Generate a chroma transformation matrix | |
529 | avfilter_get_matrix(t.vec.x / (link->w / CHROMA_WIDTH(link)), t.vec.y / (link->h / CHROMA_HEIGHT(link)), t.angle, 1.0 + t.zoom / 100.0, matrix_uv); | |
530 | // Transform the luma and chroma planes | |
531 | ret = deshake->transform(link->dst, link->w, link->h, CHROMA_WIDTH(link), CHROMA_HEIGHT(link), | |
532 | matrix_y, matrix_uv, INTERPOLATE_BILINEAR, deshake->edge, in, out); | |
533 | ||
534 | // Cleanup the old reference frame | |
535 | av_frame_free(&deshake->ref); | |
536 | ||
537 | if (ret < 0) | |
538 | return ret; | |
539 | ||
540 | // Store the current frame as the reference frame for calculating the | |
541 | // motion of the next frame | |
542 | deshake->ref = in; | |
543 | ||
544 | return ff_filter_frame(outlink, out); | |
545 | } | |
546 | ||
547 | static const AVFilterPad deshake_inputs[] = { | |
548 | { | |
549 | .name = "default", | |
550 | .type = AVMEDIA_TYPE_VIDEO, | |
551 | .filter_frame = filter_frame, | |
552 | .config_props = config_props, | |
553 | }, | |
554 | { NULL } | |
555 | }; | |
556 | ||
557 | static const AVFilterPad deshake_outputs[] = { | |
558 | { | |
559 | .name = "default", | |
560 | .type = AVMEDIA_TYPE_VIDEO, | |
561 | }, | |
562 | { NULL } | |
563 | }; | |
564 | ||
565 | AVFilter ff_vf_deshake = { | |
566 | .name = "deshake", | |
567 | .description = NULL_IF_CONFIG_SMALL("Stabilize shaky video."), | |
568 | .priv_size = sizeof(DeshakeContext), | |
569 | .init = init, | |
570 | .uninit = uninit, | |
571 | .query_formats = query_formats, | |
572 | .inputs = deshake_inputs, | |
573 | .outputs = deshake_outputs, | |
574 | .priv_class = &deshake_class, | |
575 | }; |