FFmpeg
vf_removelogo.c
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1 /*
2  * Copyright (c) 2005 Robert Edele <yartrebo@earthlink.net>
3  * Copyright (c) 2012 Stefano Sabatini
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  * Advanced blur-based logo removing filter
25  *
26  * This filter loads an image mask file showing where a logo is and
27  * uses a blur transform to remove the logo.
28  *
29  * Based on the libmpcodecs remove-logo filter by Robert Edele.
30  */
31 
32 /**
33  * This code implements a filter to remove annoying TV logos and other annoying
34  * images placed onto a video stream. It works by filling in the pixels that
35  * comprise the logo with neighboring pixels. The transform is very loosely
36  * based on a gaussian blur, but it is different enough to merit its own
37  * paragraph later on. It is a major improvement on the old delogo filter as it
38  * both uses a better blurring algorithm and uses a bitmap to use an arbitrary
39  * and generally much tighter fitting shape than a rectangle.
40  *
41  * The logo removal algorithm has two key points. The first is that it
42  * distinguishes between pixels in the logo and those not in the logo by using
43  * the passed-in bitmap. Pixels not in the logo are copied over directly without
44  * being modified and they also serve as source pixels for the logo
45  * fill-in. Pixels inside the logo have the mask applied.
46  *
47  * At init-time the bitmap is reprocessed internally, and the distance to the
48  * nearest edge of the logo (Manhattan distance), along with a little extra to
49  * remove rough edges, is stored in each pixel. This is done using an in-place
50  * erosion algorithm, and incrementing each pixel that survives any given
51  * erosion. Once every pixel is eroded, the maximum value is recorded, and a
52  * set of masks from size 0 to this size are generaged. The masks are circular
53  * binary masks, where each pixel within a radius N (where N is the size of the
54  * mask) is a 1, and all other pixels are a 0. Although a gaussian mask would be
55  * more mathematically accurate, a binary mask works better in practice because
56  * we generally do not use the central pixels in the mask (because they are in
57  * the logo region), and thus a gaussian mask will cause too little blur and
58  * thus a very unstable image.
59  *
60  * The mask is applied in a special way. Namely, only pixels in the mask that
61  * line up to pixels outside the logo are used. The dynamic mask size means that
62  * the mask is just big enough so that the edges touch pixels outside the logo,
63  * so the blurring is kept to a minimum and at least the first boundary
64  * condition is met (that the image function itself is continuous), even if the
65  * second boundary condition (that the derivative of the image function is
66  * continuous) is not met. A masking algorithm that does preserve the second
67  * boundary coundition (perhaps something based on a highly-modified bi-cubic
68  * algorithm) should offer even better results on paper, but the noise in a
69  * typical TV signal should make anything based on derivatives hopelessly noisy.
70  */
71 
72 #include "libavutil/imgutils.h"
73 #include "libavutil/opt.h"
74 #include "avfilter.h"
75 #include "formats.h"
76 #include "internal.h"
77 #include "video.h"
78 #include "bbox.h"
79 #include "lavfutils.h"
80 #include "lswsutils.h"
81 
82 typedef struct RemovelogoContext {
83  const AVClass *class;
84  char *filename;
85  /* Stores our collection of masks. The first is for an array of
86  the second for the y axis, and the third for the x axis. */
87  int ***mask;
89  int mask_w, mask_h;
90 
91  uint8_t *full_mask_data;
93  uint8_t *half_mask_data;
96 
97 #define OFFSET(x) offsetof(RemovelogoContext, x)
98 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
99 static const AVOption removelogo_options[] = {
100  { "filename", "set bitmap filename", OFFSET(filename), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
101  { "f", "set bitmap filename", OFFSET(filename), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
102  { NULL }
103 };
104 
105 AVFILTER_DEFINE_CLASS(removelogo);
106 
107 /**
108  * Choose a slightly larger mask size to improve performance.
109  *
110  * This function maps the absolute minimum mask size needed to the
111  * mask size we'll actually use. f(x) = x (the smallest that will
112  * work) will produce the sharpest results, but will be quite
113  * jittery. f(x) = 1.25x (what I'm using) is a good tradeoff in my
114  * opinion. This will calculate only at init-time, so you can put a
115  * long expression here without effecting performance.
116  */
117 #define apply_mask_fudge_factor(x) (((x) >> 2) + (x))
118 
119 /**
120  * Pre-process an image to give distance information.
121  *
122  * This function takes a bitmap image and converts it in place into a
123  * distance image. A distance image is zero for pixels outside of the
124  * logo and is the Manhattan distance (|dx| + |dy|) from the logo edge
125  * for pixels inside of the logo. This will overestimate the distance,
126  * but that is safe, and is far easier to implement than a proper
127  * pythagorean distance since I'm using a modified erosion algorithm
128  * to compute the distances.
129  *
130  * @param mask image which will be converted from a greyscale image
131  * into a distance image.
132  */
133 static void convert_mask_to_strength_mask(uint8_t *data, int linesize,
134  int w, int h, int min_val,
135  int *max_mask_size)
136 {
137  int x, y;
138 
139  /* How many times we've gone through the loop. Used in the
140  in-place erosion algorithm and to get us max_mask_size later on. */
141  int current_pass = 0;
142 
143  /* set all non-zero values to 1 */
144  for (y = 0; y < h; y++)
145  for (x = 0; x < w; x++)
146  data[y*linesize + x] = data[y*linesize + x] > min_val;
147 
148  /* For each pass, if a pixel is itself the same value as the
149  current pass, and its four neighbors are too, then it is
150  incremented. If no pixels are incremented by the end of the
151  pass, then we go again. Edge pixels are counted as always
152  excluded (this should be true anyway for any sane mask, but if
153  it isn't this will ensure that we eventually exit). */
154  while (1) {
155  /* If this doesn't get set by the end of this pass, then we're done. */
156  int has_anything_changed = 0;
157  uint8_t *current_pixel0 = data + 1 + linesize, *current_pixel;
158  current_pass++;
159 
160  for (y = 1; y < h-1; y++) {
161  current_pixel = current_pixel0;
162  for (x = 1; x < w-1; x++) {
163  /* Apply the in-place erosion transform. It is based
164  on the following two premises:
165  1 - Any pixel that fails 1 erosion will fail all
166  future erosions.
167 
168  2 - Only pixels having survived all erosions up to
169  the present will be >= to current_pass.
170  It doesn't matter if it survived the current pass,
171  failed it, or hasn't been tested yet. By using >=
172  instead of ==, we allow the algorithm to work in
173  place. */
174  if ( *current_pixel >= current_pass &&
175  *(current_pixel + 1) >= current_pass &&
176  *(current_pixel - 1) >= current_pass &&
177  *(current_pixel + linesize) >= current_pass &&
178  *(current_pixel - linesize) >= current_pass) {
179  /* Increment the value since it still has not been
180  * eroded, as evidenced by the if statement that
181  * just evaluated to true. */
182  (*current_pixel)++;
183  has_anything_changed = 1;
184  }
185  current_pixel++;
186  }
187  current_pixel0 += linesize;
188  }
189  if (!has_anything_changed)
190  break;
191  }
192 
193  /* Apply the fudge factor, which will increase the size of the
194  * mask a little to reduce jitter at the cost of more blur. */
195  for (y = 1; y < h - 1; y++)
196  for (x = 1; x < w - 1; x++)
197  data[(y * linesize) + x] = apply_mask_fudge_factor(data[(y * linesize) + x]);
198 
199  /* As a side-effect, we now know the maximum mask size, which
200  * we'll use to generate our masks. */
201  /* Apply the fudge factor to this number too, since we must ensure
202  * that enough masks are generated. */
203  *max_mask_size = apply_mask_fudge_factor(current_pass + 1);
204 }
205 
206 static int load_mask(uint8_t **mask, int *w, int *h,
207  const char *filename, void *log_ctx)
208 {
209  int ret;
210  enum AVPixelFormat pix_fmt;
211  uint8_t *src_data[4], *gray_data[4];
212  int src_linesize[4], gray_linesize[4];
213 
214  /* load image from file */
215  if ((ret = ff_load_image(src_data, src_linesize, w, h, &pix_fmt, filename, log_ctx)) < 0)
216  return ret;
217 
218  /* convert the image to GRAY8 */
219  if ((ret = ff_scale_image(gray_data, gray_linesize, *w, *h, AV_PIX_FMT_GRAY8,
220  src_data, src_linesize, *w, *h, pix_fmt,
221  log_ctx)) < 0)
222  goto end;
223 
224  /* copy mask to a newly allocated array */
225  *mask = av_malloc(*w * *h);
226  if (!*mask)
227  ret = AVERROR(ENOMEM);
228  av_image_copy_plane(*mask, *w, gray_data[0], gray_linesize[0], *w, *h);
229 
230 end:
231  av_freep(&src_data[0]);
232  av_freep(&gray_data[0]);
233  return ret;
234 }
235 
236 /**
237  * Generate a scaled down image with half width, height, and intensity.
238  *
239  * This function not only scales down an image, but halves the value
240  * in each pixel too. The purpose of this is to produce a chroma
241  * filter image out of a luma filter image. The pixel values store the
242  * distance to the edge of the logo and halving the dimensions halves
243  * the distance. This function rounds up, because a downwards rounding
244  * error could cause the filter to fail, but an upwards rounding error
245  * will only cause a minor amount of excess blur in the chroma planes.
246  */
247 static void generate_half_size_image(const uint8_t *src_data, int src_linesize,
248  uint8_t *dst_data, int dst_linesize,
249  int src_w, int src_h,
250  int *max_mask_size)
251 {
252  int x, y;
253 
254  /* Copy over the image data, using the average of 4 pixels for to
255  * calculate each downsampled pixel. */
256  for (y = 0; y < src_h/2; y++) {
257  for (x = 0; x < src_w/2; x++) {
258  /* Set the pixel if there exists a non-zero value in the
259  * source pixels, else clear it. */
260  dst_data[(y * dst_linesize) + x] =
261  src_data[((y << 1) * src_linesize) + (x << 1)] ||
262  src_data[((y << 1) * src_linesize) + (x << 1) + 1] ||
263  src_data[(((y << 1) + 1) * src_linesize) + (x << 1)] ||
264  src_data[(((y << 1) + 1) * src_linesize) + (x << 1) + 1];
265  dst_data[(y * dst_linesize) + x] = FFMIN(1, dst_data[(y * dst_linesize) + x]);
266  }
267  }
268 
269  convert_mask_to_strength_mask(dst_data, dst_linesize,
270  src_w/2, src_h/2, 0, max_mask_size);
271 }
272 
274 {
275  RemovelogoContext *s = ctx->priv;
276  int ***mask;
277  int ret = 0;
278  int a, b, c, w, h;
279  int full_max_mask_size, half_max_mask_size;
280 
281  if (!s->filename) {
282  av_log(ctx, AV_LOG_ERROR, "The bitmap file name is mandatory\n");
283  return AVERROR(EINVAL);
284  }
285 
286  /* Load our mask image. */
287  if ((ret = load_mask(&s->full_mask_data, &w, &h, s->filename, ctx)) < 0)
288  return ret;
289  s->mask_w = w;
290  s->mask_h = h;
291 
292  convert_mask_to_strength_mask(s->full_mask_data, w, w, h,
293  16, &full_max_mask_size);
294 
295  /* Create the scaled down mask image for the chroma planes. */
296  if (!(s->half_mask_data = av_mallocz(w/2 * h/2)))
297  return AVERROR(ENOMEM);
298  generate_half_size_image(s->full_mask_data, w,
299  s->half_mask_data, w/2,
300  w, h, &half_max_mask_size);
301 
302  s->max_mask_size = FFMAX(full_max_mask_size, half_max_mask_size);
303 
304  /* Create a circular mask for each size up to max_mask_size. When
305  the filter is applied, the mask size is determined on a pixel
306  by pixel basis, with pixels nearer the edge of the logo getting
307  smaller mask sizes. */
308  mask = (int ***)av_malloc_array(s->max_mask_size + 1, sizeof(int **));
309  if (!mask)
310  return AVERROR(ENOMEM);
311 
312  for (a = 0; a <= s->max_mask_size; a++) {
313  mask[a] = (int **)av_malloc_array((a * 2) + 1, sizeof(int *));
314  if (!mask[a]) {
315  av_free(mask);
316  return AVERROR(ENOMEM);
317  }
318  for (b = -a; b <= a; b++) {
319  mask[a][b + a] = (int *)av_malloc_array((a * 2) + 1, sizeof(int));
320  if (!mask[a][b + a]) {
321  av_free(mask);
322  return AVERROR(ENOMEM);
323  }
324  for (c = -a; c <= a; c++) {
325  if ((b * b) + (c * c) <= (a * a)) /* Circular 0/1 mask. */
326  mask[a][b + a][c + a] = 1;
327  else
328  mask[a][b + a][c + a] = 0;
329  }
330  }
331  }
332  s->mask = mask;
333 
334  /* Calculate our bounding rectangles, which determine in what
335  * region the logo resides for faster processing. */
336  ff_calculate_bounding_box(&s->full_mask_bbox, s->full_mask_data, w, w, h, 0, 8);
337  ff_calculate_bounding_box(&s->half_mask_bbox, s->half_mask_data, w/2, w/2, h/2, 0, 8);
338 
339 #define SHOW_LOGO_INFO(mask_type) \
340  av_log(ctx, AV_LOG_VERBOSE, #mask_type " x1:%d x2:%d y1:%d y2:%d max_mask_size:%d\n", \
341  s->mask_type##_mask_bbox.x1, s->mask_type##_mask_bbox.x2, \
342  s->mask_type##_mask_bbox.y1, s->mask_type##_mask_bbox.y2, \
343  mask_type##_max_mask_size);
344  SHOW_LOGO_INFO(full);
346 
347  return 0;
348 }
349 
351 {
352  AVFilterContext *ctx = inlink->dst;
353  RemovelogoContext *s = ctx->priv;
354 
355  if (inlink->w != s->mask_w || inlink->h != s->mask_h) {
357  "Mask image size %dx%d does not match with the input video size %dx%d\n",
358  s->mask_w, s->mask_h, inlink->w, inlink->h);
359  return AVERROR(EINVAL);
360  }
361 
362  return 0;
363 }
364 
365 /**
366  * Blur image.
367  *
368  * It takes a pixel that is inside the mask and blurs it. It does so
369  * by finding the average of all the pixels within the mask and
370  * outside of the mask.
371  *
372  * @param mask_data the mask plane to use for averaging
373  * @param image_data the image plane to blur
374  * @param w width of the image
375  * @param h height of the image
376  * @param x x-coordinate of the pixel to blur
377  * @param y y-coordinate of the pixel to blur
378  */
379 static unsigned int blur_pixel(int ***mask,
380  const uint8_t *mask_data, int mask_linesize,
381  uint8_t *image_data, int image_linesize,
382  int w, int h, int x, int y)
383 {
384  /* Mask size tells how large a circle to use. The radius is about
385  * (slightly larger than) mask size. */
386  int mask_size;
387  int start_posx, start_posy, end_posx, end_posy;
388  int i, j;
389  unsigned int accumulator = 0, divisor = 0;
390  /* What pixel we are reading out of the circular blur mask. */
391  const uint8_t *image_read_position;
392  /* What pixel we are reading out of the filter image. */
393  const uint8_t *mask_read_position;
394 
395  /* Prepare our bounding rectangle and clip it if need be. */
396  mask_size = mask_data[y * mask_linesize + x];
397  start_posx = FFMAX(0, x - mask_size);
398  start_posy = FFMAX(0, y - mask_size);
399  end_posx = FFMIN(w - 1, x + mask_size);
400  end_posy = FFMIN(h - 1, y + mask_size);
401 
402  image_read_position = image_data + image_linesize * start_posy + start_posx;
403  mask_read_position = mask_data + mask_linesize * start_posy + start_posx;
404 
405  for (j = start_posy; j <= end_posy; j++) {
406  for (i = start_posx; i <= end_posx; i++) {
407  /* Check if this pixel is in the mask or not. Only use the
408  * pixel if it is not. */
409  if (!(*mask_read_position) && mask[mask_size][i - start_posx][j - start_posy]) {
410  accumulator += *image_read_position;
411  divisor++;
412  }
413 
414  image_read_position++;
415  mask_read_position++;
416  }
417 
418  image_read_position += (image_linesize - ((end_posx + 1) - start_posx));
419  mask_read_position += (mask_linesize - ((end_posx + 1) - start_posx));
420  }
421 
422  /* If divisor is 0, it means that not a single pixel is outside of
423  the logo, so we have no data. Else we need to normalise the
424  data using the divisor. */
425  return divisor == 0 ? 255:
426  (accumulator + (divisor / 2)) / divisor; /* divide, taking into account average rounding error */
427 }
428 
429 /**
430  * Blur image plane using a mask.
431  *
432  * @param source The image to have it's logo removed.
433  * @param destination Where the output image will be stored.
434  * @param source_stride How far apart (in memory) two consecutive lines are.
435  * @param destination Same as source_stride, but for the destination image.
436  * @param width Width of the image. This is the same for source and destination.
437  * @param height Height of the image. This is the same for source and destination.
438  * @param is_image_direct If the image is direct, then source and destination are
439  * the same and we can save a lot of time by not copying pixels that
440  * haven't changed.
441  * @param filter The image that stores the distance to the edge of the logo for
442  * each pixel.
443  * @param logo_start_x smallest x-coordinate that contains at least 1 logo pixel.
444  * @param logo_start_y smallest y-coordinate that contains at least 1 logo pixel.
445  * @param logo_end_x largest x-coordinate that contains at least 1 logo pixel.
446  * @param logo_end_y largest y-coordinate that contains at least 1 logo pixel.
447  *
448  * This function processes an entire plane. Pixels outside of the logo are copied
449  * to the output without change, and pixels inside the logo have the de-blurring
450  * function applied.
451  */
452 static void blur_image(int ***mask,
453  const uint8_t *src_data, int src_linesize,
454  uint8_t *dst_data, int dst_linesize,
455  const uint8_t *mask_data, int mask_linesize,
456  int w, int h, int direct,
457  FFBoundingBox *bbox)
458 {
459  int x, y;
460  uint8_t *dst_line;
461  const uint8_t *src_line;
462 
463  if (!direct)
464  av_image_copy_plane(dst_data, dst_linesize, src_data, src_linesize, w, h);
465 
466  for (y = bbox->y1; y <= bbox->y2; y++) {
467  src_line = src_data + src_linesize * y;
468  dst_line = dst_data + dst_linesize * y;
469 
470  for (x = bbox->x1; x <= bbox->x2; x++) {
471  if (mask_data[y * mask_linesize + x]) {
472  /* Only process if we are in the mask. */
473  dst_line[x] = blur_pixel(mask,
474  mask_data, mask_linesize,
475  dst_data, dst_linesize,
476  w, h, x, y);
477  } else {
478  /* Else just copy the data. */
479  if (!direct)
480  dst_line[x] = src_line[x];
481  }
482  }
483  }
484 }
485 
486 static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
487 {
488  RemovelogoContext *s = inlink->dst->priv;
489  AVFilterLink *outlink = inlink->dst->outputs[0];
490  AVFrame *outpicref;
491  int direct = 0;
492 
493  if (av_frame_is_writable(inpicref)) {
494  direct = 1;
495  outpicref = inpicref;
496  } else {
497  outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h);
498  if (!outpicref) {
499  av_frame_free(&inpicref);
500  return AVERROR(ENOMEM);
501  }
502  av_frame_copy_props(outpicref, inpicref);
503  }
504 
505  blur_image(s->mask,
506  inpicref ->data[0], inpicref ->linesize[0],
507  outpicref->data[0], outpicref->linesize[0],
508  s->full_mask_data, inlink->w,
509  inlink->w, inlink->h, direct, &s->full_mask_bbox);
510  blur_image(s->mask,
511  inpicref ->data[1], inpicref ->linesize[1],
512  outpicref->data[1], outpicref->linesize[1],
513  s->half_mask_data, inlink->w/2,
514  inlink->w/2, inlink->h/2, direct, &s->half_mask_bbox);
515  blur_image(s->mask,
516  inpicref ->data[2], inpicref ->linesize[2],
517  outpicref->data[2], outpicref->linesize[2],
518  s->half_mask_data, inlink->w/2,
519  inlink->w/2, inlink->h/2, direct, &s->half_mask_bbox);
520 
521  if (!direct)
522  av_frame_free(&inpicref);
523 
524  return ff_filter_frame(outlink, outpicref);
525 }
526 
528 {
529  RemovelogoContext *s = ctx->priv;
530  int a, b;
531 
532  av_freep(&s->full_mask_data);
533  av_freep(&s->half_mask_data);
534 
535  if (s->mask) {
536  /* Loop through each mask. */
537  for (a = 0; a <= s->max_mask_size; a++) {
538  /* Loop through each scanline in a mask. */
539  for (b = -a; b <= a; b++) {
540  av_freep(&s->mask[a][b + a]); /* Free a scanline. */
541  }
542  av_freep(&s->mask[a]);
543  }
544  /* Free the array of pointers pointing to the masks. */
545  av_freep(&s->mask);
546  }
547 }
548 
549 static const AVFilterPad removelogo_inputs[] = {
550  {
551  .name = "default",
552  .type = AVMEDIA_TYPE_VIDEO,
553  .config_props = config_props_input,
554  .filter_frame = filter_frame,
555  },
556 };
557 
558 static const AVFilterPad removelogo_outputs[] = {
559  {
560  .name = "default",
561  .type = AVMEDIA_TYPE_VIDEO,
562  },
563 };
564 
566  .name = "removelogo",
567  .description = NULL_IF_CONFIG_SMALL("Remove a TV logo based on a mask image."),
568  .priv_size = sizeof(RemovelogoContext),
569  .init = init,
570  .uninit = uninit,
574  .priv_class = &removelogo_class,
576 };
ff_get_video_buffer
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:101
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(removelogo)
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
opt.h
bbox.h
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:999
inlink
The exact code depends on how similar the blocks are and how related they are to the and needs to apply these operations to the correct inlink or outlink if there are several Macros are available to factor that when no extra processing is inlink
Definition: filter_design.txt:212
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:116
removelogo_inputs
static const AVFilterPad removelogo_inputs[]
Definition: vf_removelogo.c:549
RemovelogoContext::full_mask_bbox
FFBoundingBox full_mask_bbox
Definition: vf_removelogo.c:92
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:325
ff_calculate_bounding_box
int ff_calculate_bounding_box(FFBoundingBox *bbox, const uint8_t *data, int linesize, int w, int h, int min_val, int depth)
Calculate the smallest rectangle that will encompass the region with values > min_val.
Definition: bbox.c:81
w
uint8_t w
Definition: llviddspenc.c:38
OFFSET
#define OFFSET(x)
Definition: vf_removelogo.c:97
RemovelogoContext::mask_w
int mask_w
Definition: vf_removelogo.c:89
convert_mask_to_strength_mask
static void convert_mask_to_strength_mask(uint8_t *data, int linesize, int w, int h, int min_val, int *max_mask_size)
Pre-process an image to give distance information.
Definition: vf_removelogo.c:133
AVOption
AVOption.
Definition: opt.h:251
b
#define b
Definition: input.c:34
data
const char data[16]
Definition: mxf.c:146
half
static uint8_t half(int a, int b)
Definition: mobiclip.c:541
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
Definition: vf_removelogo.c:486
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:175
video.h
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:346
config_props_input
static int config_props_input(AVFilterLink *inlink)
Definition: vf_removelogo.c:350
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
av_image_copy_plane
void av_image_copy_plane(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize, int bytewidth, int height)
Copy image plane from src to dst.
Definition: imgutils.c:374
formats.h
blur_pixel
static unsigned int blur_pixel(int ***mask, const uint8_t *mask_data, int mask_linesize, uint8_t *image_data, int image_linesize, int w, int h, int x, int y)
Blur image.
Definition: vf_removelogo.c:379
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:49
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
av_cold
#define av_cold
Definition: attributes.h:90
mask
static const uint16_t mask[17]
Definition: lzw.c:38
s
#define s(width, name)
Definition: cbs_vp9.c:256
direct
static void fn() direct(const ftype *in, const ctype *ir, int len, ftype *out)
Definition: afir_template.c:248
ctx
AVFormatContext * ctx
Definition: movenc.c:48
pix_fmt
static enum AVPixelFormat pix_fmt
Definition: demuxing_decoding.c:41
removelogo_options
static const AVOption removelogo_options[]
Definition: vf_removelogo.c:99
AV_PIX_FMT_YUV420P
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:190
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
NULL
#define NULL
Definition: coverity.c:32
av_frame_copy_props
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
Definition: frame.c:603
RemovelogoContext::mask_h
int mask_h
Definition: vf_removelogo.c:89
apply_mask_fudge_factor
#define apply_mask_fudge_factor(x)
Choose a slightly larger mask size to improve performance.
Definition: vf_removelogo.c:117
RemovelogoContext::half_mask_data
uint8_t * half_mask_data
Definition: vf_removelogo.c:93
AV_PIX_FMT_GRAY8
@ AV_PIX_FMT_GRAY8
Y , 8bpp.
Definition: pixfmt.h:74
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
accumulator
#define accumulator
Definition: phase_template.c:34
RemovelogoContext::half_mask_bbox
FFBoundingBox half_mask_bbox
Definition: vf_removelogo.c:94
FFBoundingBox::x1
int x1
Definition: bbox.h:27
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
RemovelogoContext::max_mask_size
int max_mask_size
Definition: vf_removelogo.c:88
SHOW_LOGO_INFO
#define SHOW_LOGO_INFO(mask_type)
blur_image
static void blur_image(int ***mask, const uint8_t *src_data, int src_linesize, uint8_t *dst_data, int dst_linesize, const uint8_t *mask_data, int mask_linesize, int w, int h, int direct, FFBoundingBox *bbox)
Blur image plane using a mask.
Definition: vf_removelogo.c:452
av_frame_is_writable
int av_frame_is_writable(AVFrame *frame)
Check if the frame data is writable.
Definition: frame.c:533
ff_load_image
int ff_load_image(uint8_t *data[4], int linesize[4], int *w, int *h, enum AVPixelFormat *pix_fmt, const char *filename, void *log_ctx)
Load image from filename and put the resulting image in data.
Definition: lavfutils.c:34
a
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:41
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:191
internal.h
AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
Some filters support a generic "enable" expression option that can be used to enable or disable a fil...
Definition: avfilter.h:152
FILTER_SINGLE_PIXFMT
#define FILTER_SINGLE_PIXFMT(pix_fmt_)
Definition: internal.h:180
FFBoundingBox::y1
int y1
Definition: bbox.h:27
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
RemovelogoContext::mask
int *** mask
Definition: vf_removelogo.c:87
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_removelogo.c:527
av_malloc_array
#define av_malloc_array(a, b)
Definition: tableprint_vlc.h:31
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
ff_vf_removelogo
const AVFilter ff_vf_removelogo
Definition: vf_removelogo.c:565
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:264
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:55
AVFilter
Filter definition.
Definition: avfilter.h:171
ret
ret
Definition: filter_design.txt:187
generate_half_size_image
static void generate_half_size_image(const uint8_t *src_data, int src_linesize, uint8_t *dst_data, int dst_linesize, int src_w, int src_h, int *max_mask_size)
Generate a scaled down image with half width, height, and intensity.
Definition: vf_removelogo.c:247
RemovelogoContext
This code implements a filter to remove annoying TV logos and other annoying images placed onto a vid...
Definition: vf_removelogo.c:82
avfilter.h
lavfutils.h
init
static av_cold int init(AVFilterContext *ctx)
Definition: vf_removelogo.c:273
AVFilterContext
An instance of a filter.
Definition: avfilter.h:408
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
FFBoundingBox
Definition: bbox.h:26
av_free
#define av_free(p)
Definition: tableprint_vlc.h:33
removelogo_outputs
static const AVFilterPad removelogo_outputs[]
Definition: vf_removelogo.c:558
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:191
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
imgutils.h
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
Definition: frame.h:370
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
RemovelogoContext::filename
char * filename
Definition: vf_removelogo.c:84
load_mask
static int load_mask(uint8_t **mask, int *w, int *h, const char *filename, void *log_ctx)
Definition: vf_removelogo.c:206
FLAGS
#define FLAGS
Definition: vf_removelogo.c:98
h
h
Definition: vp9dsp_template.c:2038
RemovelogoContext::full_mask_data
uint8_t * full_mask_data
Definition: vf_removelogo.c:91
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:229
int
int
Definition: ffmpeg_filter.c:155
ff_scale_image
int ff_scale_image(uint8_t *dst_data[4], int dst_linesize[4], int dst_w, int dst_h, enum AVPixelFormat dst_pix_fmt, uint8_t *const src_data[4], int src_linesize[4], int src_w, int src_h, enum AVPixelFormat src_pix_fmt, void *log_ctx)
Scale image using libswscale.
Definition: lswsutils.c:22
lswsutils.h