FFmpeg coverage

Line	Branch	Exec	Source
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 "filters.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		✗	ret = AVERROR(EINVAL);
483		✗	goto fail;
484			}
485
486		✗	if (deshake->cx < 0 || deshake->cy < 0 || deshake->cw < 0 || deshake->ch < 0) {
487			// Find the most likely global motion for the current frame
488		✗	find_motion(deshake, (deshake->ref == NULL) ? in->data[0] : deshake->ref->data[0], in->data[0], link->w, link->h, in->linesize[0], &t);
489			} else {
490		✗	uint8_t *src1 = (deshake->ref == NULL) ? in->data[0] : deshake->ref->data[0];
491		✗	uint8_t *src2 = in->data[0];
492
493		✗	deshake->cx = FFMIN(deshake->cx, link->w);
494		✗	deshake->cy = FFMIN(deshake->cy, link->h);
495
496		✗	if ((unsigned)deshake->cx + (unsigned)deshake->cw > link->w) deshake->cw = link->w - deshake->cx;
497		✗	if ((unsigned)deshake->cy + (unsigned)deshake->ch > link->h) deshake->ch = link->h - deshake->cy;
498
499			// Quadword align right margin
500		✗	deshake->cw &= ~15;
501
502		✗	src1 += deshake->cy * in->linesize[0] + deshake->cx;
503		✗	src2 += deshake->cy * in->linesize[0] + deshake->cx;
504
505		✗	find_motion(deshake, src1, src2, deshake->cw, deshake->ch, in->linesize[0], &t);
506			}
507
508
509			// Copy transform so we can output it later to compare to the smoothed value
510		✗	orig.vec.x = t.vec.x;
511		✗	orig.vec.y = t.vec.y;
512		✗	orig.angle = t.angle;
513		✗	orig.zoom = t.zoom;
514
515			// Generate a one-sided moving exponential average
516		✗	deshake->avg.vec.x = alpha * t.vec.x + (1.0 - alpha) * deshake->avg.vec.x;
517		✗	deshake->avg.vec.y = alpha * t.vec.y + (1.0 - alpha) * deshake->avg.vec.y;
518		✗	deshake->avg.angle = alpha * t.angle + (1.0 - alpha) * deshake->avg.angle;
519		✗	deshake->avg.zoom = alpha * t.zoom + (1.0 - alpha) * deshake->avg.zoom;
520
521			// Remove the average from the current motion to detect the motion that
522			// is not on purpose, just as jitter from bumping the camera
523		✗	t.vec.x -= deshake->avg.vec.x;
524		✗	t.vec.y -= deshake->avg.vec.y;
525		✗	t.angle -= deshake->avg.angle;
526		✗	t.zoom -= deshake->avg.zoom;
527
528			// Invert the motion to undo it
529		✗	t.vec.x *= -1;
530		✗	t.vec.y *= -1;
531		✗	t.angle *= -1;
532
533			// Write statistics to file
534		✗	if (deshake->fp) {
535		✗	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);
536		✗	fwrite(tmp, 1, strlen(tmp), deshake->fp);
537			}
538
539			// Turn relative current frame motion into absolute by adding it to the
540			// last absolute motion
541		✗	t.vec.x += deshake->last.vec.x;
542		✗	t.vec.y += deshake->last.vec.y;
543		✗	t.angle += deshake->last.angle;
544		✗	t.zoom += deshake->last.zoom;
545
546			// Shrink motion by 10% to keep things centered in the camera frame
547		✗	t.vec.x *= 0.9;
548		✗	t.vec.y *= 0.9;
549		✗	t.angle *= 0.9;
550
551			// Store the last absolute motion information
552		✗	deshake->last.vec.x = t.vec.x;
553		✗	deshake->last.vec.y = t.vec.y;
554		✗	deshake->last.angle = t.angle;
555		✗	deshake->last.zoom = t.zoom;
556
557		✗	transform_zoom = 1.0 + t.zoom / 100.0;
558
559			// Generate a luma transformation matrix
560		✗	ff_get_matrix(t.vec.x, t.vec.y, t.angle, transform_zoom, transform_zoom, matrix_y);
561			// Generate a chroma transformation matrix
562		✗	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);
563			// Transform the luma and chroma planes
564		✗	ret = deshake->transform(link->dst, link->w, link->h, chroma_width, chroma_height,
565		✗	matrix_y, matrix_uv, INTERPOLATE_BILINEAR, deshake->edge, in, out);
566
567			// Cleanup the old reference frame
568		✗	av_frame_free(&deshake->ref);
569
570		✗	if (ret < 0)
571		✗	goto fail;
572
573			// Store the current frame as the reference frame for calculating the
574			// motion of the next frame
575		✗	deshake->ref = in;
576
577		✗	return ff_filter_frame(outlink, out);
578		✗	fail:
579		✗	av_frame_free(&out);
580		✗	return ret;
581			}
582
583			static const AVFilterPad deshake_inputs[] = {
584			{
585			.name = "default",
586			.type = AVMEDIA_TYPE_VIDEO,
587			.filter_frame = filter_frame,
588			.config_props = config_props,
589			},
590			};
591
592			const FFFilter ff_vf_deshake = {
593			.p.name = "deshake",
594			.p.description = NULL_IF_CONFIG_SMALL("Stabilize shaky video."),
595			.p.priv_class = &deshake_class,
596			.priv_size = sizeof(DeshakeContext),
597			.init = init,
598			.uninit = uninit,
599			FILTER_INPUTS(deshake_inputs),
600			FILTER_OUTPUTS(ff_video_default_filterpad),
601			FILTER_PIXFMTS_ARRAY(pix_fmts),
602			};
603