FFmpeg
drawutils.c
Go to the documentation of this file.
1 /*
2  * Copyright 2011 Stefano Sabatini <stefano.sabatini-lala poste it>
3  * Copyright 2012 Nicolas George <nicolas.george normalesup 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 #include <string.h>
23 
24 #include "libavutil/avassert.h"
25 #include "libavutil/avutil.h"
26 #include "libavutil/csp.h"
27 #include "libavutil/intreadwrite.h"
28 #include "libavutil/pixdesc.h"
29 #include "colorspace.h"
30 #include "drawutils.h"
31 #include "formats.h"
32 
33 enum { RED = 0, GREEN, BLUE, ALPHA };
34 
35 static int fill_map(const AVPixFmtDescriptor *desc, uint8_t *map)
36 {
39  return AVERROR(EINVAL);
40  av_assert0(desc->nb_components == 3 + !!(desc->flags & AV_PIX_FMT_FLAG_ALPHA));
41  if (desc->flags & AV_PIX_FMT_FLAG_PLANAR) {
43  return AVERROR(EINVAL);
44  map[RED] = desc->comp[0].plane;
45  map[GREEN] = desc->comp[1].plane;
46  map[BLUE] = desc->comp[2].plane;
47  map[ALPHA] = (desc->flags & AV_PIX_FMT_FLAG_ALPHA) ? desc->comp[3].plane : 3;
48  } else {
49  int had0 = 0;
50  unsigned depthb = 0;
51  for (unsigned i = 0; i < desc->nb_components; i++) {
52  /* all components must have same depth in bytes */
53  unsigned db = (desc->comp[i].depth + 7) / 8;
54  unsigned pos = desc->comp[i].offset / db;
55  if (depthb && (depthb != db))
56  return AVERROR(ENOSYS);
57 
58  if (desc->comp[i].offset % db)
59  return AVERROR(ENOSYS);
60 
61  had0 |= pos == 0;
62  map[i] = pos;
63  depthb = db;
64  }
65 
66  if (desc->nb_components == 3)
67  map[ALPHA] = had0 ? 3 : 0;
68  }
69 
70  av_assert0(map[RED] != map[GREEN]);
71  av_assert0(map[GREEN] != map[BLUE]);
72  av_assert0(map[BLUE] != map[RED]);
73  av_assert0(map[RED] != map[ALPHA]);
75  av_assert0(map[BLUE] != map[ALPHA]);
76 
77  return 0;
78 }
79 
80 int ff_fill_rgba_map(uint8_t *rgba_map, enum AVPixelFormat pix_fmt)
81 {
83  if (!(desc->flags & AV_PIX_FMT_FLAG_RGB))
84  return AVERROR(EINVAL);
85  return fill_map(desc, rgba_map);
86 }
87 
88 int ff_fill_ayuv_map(uint8_t *ayuv_map, enum AVPixelFormat pix_fmt)
89 {
91  if (desc->flags & AV_PIX_FMT_FLAG_RGB)
92  return AVERROR(EINVAL);
93  return fill_map(desc, ayuv_map);
94 }
95 
97  enum AVColorRange range, unsigned flags)
98 {
100  const AVLumaCoefficients *luma = NULL;
101  const AVComponentDescriptor *c;
102  unsigned nb_planes = 0;
103  int pixelstep[MAX_PLANES] = { 0 };
104  int depthb = 0;
105 
106  if (!desc || !desc->name)
107  return AVERROR(EINVAL);
108  if (desc->flags & AV_PIX_FMT_FLAG_BE)
109  return AVERROR(ENOSYS);
111  return AVERROR(ENOSYS);
112  if (csp == AVCOL_SPC_UNSPECIFIED)
114  if (!(desc->flags & AV_PIX_FMT_FLAG_RGB) && !(luma = av_csp_luma_coeffs_from_avcsp(csp)))
115  return AVERROR(EINVAL);
122  return AVERROR(EINVAL);
123  for (unsigned i = 0; i < desc->nb_components; i++) {
124  int db;
125  c = &desc->comp[i];
126  /* for now, only 8-16 bits formats */
127  if (c->depth < 8 || c->depth > 16)
128  return AVERROR(ENOSYS);
129  if (c->plane >= MAX_PLANES)
130  return AVERROR(ENOSYS);
131  /* data must either be in the high or low bits, never middle */
132  if (c->shift && ((c->shift + c->depth) & 0x7))
133  return AVERROR(ENOSYS);
134  /* mixed >8 and <=8 depth */
135  db = (c->depth + 7) / 8;
136  if (depthb && (depthb != db))
137  return AVERROR(ENOSYS);
138  depthb = db;
139  if (db * (c->offset + 1) > 16)
140  return AVERROR(ENOSYS);
141  if (c->offset % db)
142  return AVERROR(ENOSYS);
143  /* strange interleaving */
144  if (pixelstep[c->plane] != 0 &&
145  pixelstep[c->plane] != c->step)
146  return AVERROR(ENOSYS);
147  pixelstep[c->plane] = c->step;
148  if (pixelstep[c->plane] >= 8)
149  return AVERROR(ENOSYS);
150  nb_planes = FFMAX(nb_planes, c->plane + 1);
151  }
152  memset(draw, 0, sizeof(*draw));
153  draw->desc = desc;
154  draw->format = format;
155  draw->nb_planes = nb_planes;
156  draw->range = range;
157  draw->csp = csp;
158  draw->flags = flags;
159  if (luma)
160  ff_fill_rgb2yuv_table(luma, draw->rgb2yuv);
161  memcpy(draw->pixelstep, pixelstep, sizeof(draw->pixelstep));
162  draw->hsub[1] = draw->hsub[2] = draw->hsub_max = desc->log2_chroma_w;
163  draw->vsub[1] = draw->vsub[2] = draw->vsub_max = desc->log2_chroma_h;
164  return 0;
165 }
166 
168 {
170 }
171 
172 void ff_draw_color(FFDrawContext *draw, FFDrawColor *color, const uint8_t rgba[4])
173 {
174  double yuvad[4];
175  double rgbad[4];
176  const AVPixFmtDescriptor *desc = draw->desc;
177 
178  if (rgba != color->rgba)
179  memcpy(color->rgba, rgba, sizeof(color->rgba));
180 
181  memset(color->comp, 0, sizeof(color->comp));
182 
183  for (int i = 0; i < 4; i++)
184  rgbad[i] = color->rgba[i] / 255.;
185 
186  if (draw->desc->flags & AV_PIX_FMT_FLAG_RGB)
187  memcpy(yuvad, rgbad, sizeof(double) * 3);
188  else
189  ff_matrix_mul_3x3_vec(yuvad, rgbad, draw->rgb2yuv);
190 
191  yuvad[3] = rgbad[3];
192 
193  for (int i = 0; i < 3; i++) {
194  int chroma = (!(draw->desc->flags & AV_PIX_FMT_FLAG_RGB) && i > 0);
195  if (draw->range == AVCOL_RANGE_MPEG) {
196  yuvad[i] *= (chroma ? 224. : 219.) / 255.;
197  yuvad[i] += (chroma ? 128. : 16.) / 255.;
198  } else if (chroma) {
199  yuvad[i] += 0.5;
200  }
201  }
202 
203  // Ensure we place the alpha appropriately for gray formats
204  if (desc->nb_components <= 2)
205  yuvad[1] = yuvad[3];
206 
207  for (unsigned i = 0; i < desc->nb_components; i++) {
208  unsigned val = yuvad[i] * ((1 << (draw->desc->comp[i].depth + draw->desc->comp[i].shift)) - 1) + 0.5;
209  if (desc->comp[i].depth > 8)
210  color->comp[desc->comp[i].plane].u16[desc->comp[i].offset / 2] = val;
211  else
212  color->comp[desc->comp[i].plane].u8[desc->comp[i].offset] = val;
213  }
214 }
215 
216 static uint8_t *pointer_at(FFDrawContext *draw, uint8_t *data[], int linesize[],
217  int plane, int x, int y)
218 {
219  return data[plane] +
220  (y >> draw->vsub[plane]) * linesize[plane] +
221  (x >> draw->hsub[plane]) * draw->pixelstep[plane];
222 }
223 
225  uint8_t *dst[], int dst_linesize[],
226  uint8_t *src[], int src_linesize[],
227  int dst_x, int dst_y, int src_x, int src_y,
228  int w, int h)
229 {
230  int wp, hp;
231  uint8_t *p, *q;
232 
233  for (int plane = 0; plane < draw->nb_planes; plane++) {
234  p = pointer_at(draw, src, src_linesize, plane, src_x, src_y);
235  q = pointer_at(draw, dst, dst_linesize, plane, dst_x, dst_y);
236  wp = AV_CEIL_RSHIFT(w, draw->hsub[plane]) * draw->pixelstep[plane];
237  hp = AV_CEIL_RSHIFT(h, draw->vsub[plane]);
238  for (int y = 0; y < hp; y++) {
239  memcpy(q, p, wp);
240  p += src_linesize[plane];
241  q += dst_linesize[plane];
242  }
243  }
244 }
245 
247  uint8_t *dst[], int dst_linesize[],
248  int dst_x, int dst_y, int w, int h)
249 {
250  int wp, hp;
251  uint8_t *p0, *p;
252  FFDrawColor color_tmp = *color;
253 
254  for (int plane = 0; plane < draw->nb_planes; plane++) {
255  p0 = pointer_at(draw, dst, dst_linesize, plane, dst_x, dst_y);
256  wp = AV_CEIL_RSHIFT(w, draw->hsub[plane]);
257  hp = AV_CEIL_RSHIFT(h, draw->vsub[plane]);
258  if (!hp)
259  return;
260  p = p0;
261 
262  if (HAVE_BIGENDIAN && draw->desc->comp[0].depth > 8) {
263  for (int x = 0; 2*x < draw->pixelstep[plane]; x++)
264  color_tmp.comp[plane].u16[x] = av_bswap16(color_tmp.comp[plane].u16[x]);
265  }
266 
267  /* copy first line from color */
268  for (int x = 0; x < wp; x++) {
269  memcpy(p, color_tmp.comp[plane].u8, draw->pixelstep[plane]);
270  p += draw->pixelstep[plane];
271  }
272  wp *= draw->pixelstep[plane];
273  /* copy next lines from first line */
274  p = p0 + dst_linesize[plane];
275  for (int y = 1; y < hp; y++) {
276  memcpy(p, p0, wp);
277  p += dst_linesize[plane];
278  }
279  }
280 }
281 
282 /**
283  * Clip interval [x; x+w[ within [0; wmax[.
284  * The resulting w may be negative if the final interval is empty.
285  * dx, if not null, return the difference between in and out value of x.
286  */
287 static void clip_interval(int wmax, int *x, int *w, int *dx)
288 {
289  if (dx)
290  *dx = 0;
291  if (*x < 0) {
292  if (dx)
293  *dx = -*x;
294  *w += *x;
295  *x = 0;
296  }
297  if (*x + *w > wmax)
298  *w = wmax - *x;
299 }
300 
301 /**
302  * Decompose w pixels starting at x
303  * into start + (w starting at x) + end
304  * with x and w aligned on multiples of 1<<sub.
305  */
306 static void subsampling_bounds(int sub, int *x, int *w, int *start, int *end)
307 {
308  int mask = (1 << sub) - 1;
309 
310  *start = (-*x) & mask;
311  *x += *start;
312  *start = FFMIN(*start, *w);
313  *w -= *start;
314  *end = *w & mask;
315  *w >>= sub;
316 }
317 
318 /* If alpha is in the [ 0 ; 0x1010101 ] range,
319  then alpha * value is in the [ 0 ; 0xFFFFFFFF ] range,
320  and >> 24 gives a correct rounding. */
321 static void blend_line(uint8_t *dst, unsigned src, unsigned alpha,
322  int dx, int w, unsigned hsub, int left, int right)
323 {
324  unsigned asrc = alpha * src;
325  unsigned tau = 0x1010101 - alpha;
326 
327  if (left) {
328  unsigned suba = (left * alpha) >> hsub;
329  *dst = (*dst * (0x1010101 - suba) + src * suba) >> 24;
330  dst += dx;
331  }
332  for (int x = 0; x < w; x++) {
333  *dst = (*dst * tau + asrc) >> 24;
334  dst += dx;
335  }
336  if (right) {
337  unsigned suba = (right * alpha) >> hsub;
338  *dst = (*dst * (0x1010101 - suba) + src * suba) >> 24;
339  }
340 }
341 
342 static void blend_line16(uint8_t *dst, unsigned src, unsigned alpha,
343  int dx, int w, unsigned hsub, int left, int right)
344 {
345  unsigned asrc = alpha * src;
346  unsigned tau = 0x10001 - alpha;
347 
348  if (left) {
349  unsigned suba = (left * alpha) >> hsub;
350  uint16_t value = AV_RL16(dst);
351  AV_WL16(dst, (value * (0x10001 - suba) + src * suba) >> 16);
352  dst += dx;
353  }
354  for (int x = 0; x < w; x++) {
355  uint16_t value = AV_RL16(dst);
356  AV_WL16(dst, (value * tau + asrc) >> 16);
357  dst += dx;
358  }
359  if (right) {
360  unsigned suba = (right * alpha) >> hsub;
361  uint16_t value = AV_RL16(dst);
362  AV_WL16(dst, (value * (0x10001 - suba) + src * suba) >> 16);
363  }
364 }
365 
367  uint8_t *dst[], int dst_linesize[],
368  int dst_w, int dst_h,
369  int x0, int y0, int w, int h)
370 {
371  unsigned alpha, nb_planes, nb_comp;
372  int w_sub, h_sub, x_sub, y_sub, left, right, top, bottom;
373  uint8_t *p0, *p;
374 
375  nb_comp = draw->desc->nb_components -
376  !!(draw->desc->flags & AV_PIX_FMT_FLAG_ALPHA && !(draw->flags & FF_DRAW_PROCESS_ALPHA));
377 
378  /* TODO optimize if alpha = 0xFF */
379  clip_interval(dst_w, &x0, &w, NULL);
380  clip_interval(dst_h, &y0, &h, NULL);
381  if (w <= 0 || h <= 0 || !color->rgba[3])
382  return;
383  if (draw->desc->comp[0].depth <= 8) {
384  /* 0x10203 * alpha + 2 is in the [ 2 ; 0x1010101 - 2 ] range */
385  alpha = 0x10203 * color->rgba[3] + 0x2;
386  } else {
387  /* 0x101 * alpha is in the [ 2 ; 0x1001] range */
388  alpha = 0x101 * color->rgba[3] + 0x2;
389  }
390  nb_planes = draw->nb_planes - !!(draw->desc->flags & AV_PIX_FMT_FLAG_ALPHA && !(draw->flags & FF_DRAW_PROCESS_ALPHA));
391  nb_planes += !nb_planes;
392  for (unsigned plane = 0; plane < nb_planes; plane++) {
393  p0 = pointer_at(draw, dst, dst_linesize, plane, x0, y0);
394  w_sub = w;
395  h_sub = h;
396  x_sub = x0;
397  y_sub = y0;
398  subsampling_bounds(draw->hsub[plane], &x_sub, &w_sub, &left, &right);
399  subsampling_bounds(draw->vsub[plane], &y_sub, &h_sub, &top, &bottom);
400  for (unsigned comp = 0; comp < nb_comp; comp++) {
401  const int depth = draw->desc->comp[comp].depth;
402  const int offset = draw->desc->comp[comp].offset;
403  const int index = offset / ((depth + 7) / 8);
404 
405  if (draw->desc->comp[comp].plane != plane)
406  continue;
407  p = p0 + offset;
408  if (top) {
409  if (depth <= 8) {
410  blend_line(p, color->comp[plane].u8[index], alpha >> 1,
411  draw->pixelstep[plane], w_sub,
412  draw->hsub[plane], left, right);
413  } else {
414  blend_line16(p, color->comp[plane].u16[index], alpha >> 1,
415  draw->pixelstep[plane], w_sub,
416  draw->hsub[plane], left, right);
417  }
418  p += dst_linesize[plane];
419  }
420  if (depth <= 8) {
421  for (int y = 0; y < h_sub; y++) {
422  blend_line(p, color->comp[plane].u8[index], alpha,
423  draw->pixelstep[plane], w_sub,
424  draw->hsub[plane], left, right);
425  p += dst_linesize[plane];
426  }
427  } else {
428  for (int y = 0; y < h_sub; y++) {
429  blend_line16(p, color->comp[plane].u16[index], alpha,
430  draw->pixelstep[plane], w_sub,
431  draw->hsub[plane], left, right);
432  p += dst_linesize[plane];
433  }
434  }
435  if (bottom) {
436  if (depth <= 8) {
437  blend_line(p, color->comp[plane].u8[index], alpha >> 1,
438  draw->pixelstep[plane], w_sub,
439  draw->hsub[plane], left, right);
440  } else {
441  blend_line16(p, color->comp[plane].u16[index], alpha >> 1,
442  draw->pixelstep[plane], w_sub,
443  draw->hsub[plane], left, right);
444  }
445  }
446  }
447  }
448 }
449 
450 static void blend_pixel16(uint8_t *dst, unsigned src, unsigned alpha,
451  const uint8_t *mask, int mask_linesize, int l2depth,
452  unsigned w, unsigned h, unsigned shift, unsigned xm0)
453 {
454  unsigned t = 0;
455  unsigned xmshf = 3 - l2depth;
456  unsigned xmmod = 7 >> l2depth;
457  unsigned mbits = (1 << (1 << l2depth)) - 1;
458  unsigned mmult = 255 / mbits;
459  uint16_t value = AV_RL16(dst);
460 
461  for (unsigned y = 0; y < h; y++) {
462  unsigned xm = xm0;
463  for (unsigned x = 0; x < w; x++) {
464  t += ((mask[xm >> xmshf] >> ((~xm & xmmod) << l2depth)) & mbits)
465  * mmult;
466  xm++;
467  }
468  mask += mask_linesize;
469  }
470  alpha = (t >> shift) * alpha;
471  AV_WL16(dst, ((0x10001 - alpha) * value + alpha * src) >> 16);
472 }
473 
474 static void blend_pixel(uint8_t *dst, unsigned src, unsigned alpha,
475  const uint8_t *mask, int mask_linesize, int l2depth,
476  unsigned w, unsigned h, unsigned shift, unsigned xm0)
477 {
478  unsigned t = 0;
479  unsigned xmshf = 3 - l2depth;
480  unsigned xmmod = 7 >> l2depth;
481  unsigned mbits = (1 << (1 << l2depth)) - 1;
482  unsigned mmult = 255 / mbits;
483 
484  for (unsigned y = 0; y < h; y++) {
485  unsigned xm = xm0;
486  for (unsigned x = 0; x < w; x++) {
487  t += ((mask[xm >> xmshf] >> ((~xm & xmmod) << l2depth)) & mbits)
488  * mmult;
489  xm++;
490  }
491  mask += mask_linesize;
492  }
493  alpha = (t >> shift) * alpha;
494  *dst = ((0x1010101 - alpha) * *dst + alpha * src) >> 24;
495 }
496 
497 static void blend_line_hv16(uint8_t *dst, int dst_delta,
498  unsigned src, unsigned alpha,
499  const uint8_t *mask, int mask_linesize, int l2depth, int w,
500  unsigned hsub, unsigned vsub,
501  int xm, int left, int right, int hband)
502 {
503 
504  if (left) {
505  blend_pixel16(dst, src, alpha, mask, mask_linesize, l2depth,
506  left, hband, hsub + vsub, xm);
507  dst += dst_delta;
508  xm += left;
509  }
510  for (int x = 0; x < w; x++) {
511  blend_pixel16(dst, src, alpha, mask, mask_linesize, l2depth,
512  1 << hsub, hband, hsub + vsub, xm);
513  dst += dst_delta;
514  xm += 1 << hsub;
515  }
516  if (right)
517  blend_pixel16(dst, src, alpha, mask, mask_linesize, l2depth,
518  right, hband, hsub + vsub, xm);
519 }
520 
521 static void blend_line_hv(uint8_t *dst, int dst_delta,
522  unsigned src, unsigned alpha,
523  const uint8_t *mask, int mask_linesize, int l2depth, int w,
524  unsigned hsub, unsigned vsub,
525  int xm, int left, int right, int hband)
526 {
527 
528  if (left) {
529  blend_pixel(dst, src, alpha, mask, mask_linesize, l2depth,
530  left, hband, hsub + vsub, xm);
531  dst += dst_delta;
532  xm += left;
533  }
534  for (int x = 0; x < w; x++) {
535  blend_pixel(dst, src, alpha, mask, mask_linesize, l2depth,
536  1 << hsub, hband, hsub + vsub, xm);
537  dst += dst_delta;
538  xm += 1 << hsub;
539  }
540  if (right)
541  blend_pixel(dst, src, alpha, mask, mask_linesize, l2depth,
542  right, hband, hsub + vsub, xm);
543 }
544 
546  uint8_t *dst[], int dst_linesize[], int dst_w, int dst_h,
547  const uint8_t *mask, int mask_linesize, int mask_w, int mask_h,
548  int l2depth, unsigned endianness, int x0, int y0)
549 {
550  unsigned alpha, nb_planes, nb_comp;
551  int xm0, ym0, w_sub, h_sub, x_sub, y_sub, left, right, top, bottom;
552  uint8_t *p;
553  const uint8_t *m;
554 
555  nb_comp = draw->desc->nb_components -
556  !!(draw->desc->flags & AV_PIX_FMT_FLAG_ALPHA && !(draw->flags & FF_DRAW_PROCESS_ALPHA));
557 
558  clip_interval(dst_w, &x0, &mask_w, &xm0);
559  clip_interval(dst_h, &y0, &mask_h, &ym0);
560  mask += ym0 * mask_linesize;
561  if (mask_w <= 0 || mask_h <= 0 || !color->rgba[3])
562  return;
563  if (draw->desc->comp[0].depth <= 8) {
564  /* alpha is in the [ 0 ; 0x10203 ] range,
565  alpha * mask is in the [ 0 ; 0x1010101 - 4 ] range */
566  alpha = (0x10307 * color->rgba[3] + 0x3) >> 8;
567  } else {
568  alpha = (0x101 * color->rgba[3] + 0x2) >> 8;
569  }
570  nb_planes = draw->nb_planes - !!(draw->desc->flags & AV_PIX_FMT_FLAG_ALPHA && !(draw->flags & FF_DRAW_PROCESS_ALPHA));
571  nb_planes += !nb_planes;
572  for (unsigned plane = 0; plane < nb_planes; plane++) {
573  uint8_t *p0 = pointer_at(draw, dst, dst_linesize, plane, x0, y0);
574  w_sub = mask_w;
575  h_sub = mask_h;
576  x_sub = x0;
577  y_sub = y0;
578  subsampling_bounds(draw->hsub[plane], &x_sub, &w_sub, &left, &right);
579  subsampling_bounds(draw->vsub[plane], &y_sub, &h_sub, &top, &bottom);
580  for (unsigned comp = 0; comp < nb_comp; comp++) {
581  const int depth = draw->desc->comp[comp].depth;
582  const int offset = draw->desc->comp[comp].offset;
583  const int index = offset / ((depth + 7) / 8);
584 
585  if (draw->desc->comp[comp].plane != plane)
586  continue;
587  p = p0 + offset;
588  m = mask;
589  if (top) {
590  if (depth <= 8) {
591  blend_line_hv(p, draw->pixelstep[plane],
592  color->comp[plane].u8[index], alpha,
593  m, mask_linesize, l2depth, w_sub,
594  draw->hsub[plane], draw->vsub[plane],
595  xm0, left, right, top);
596  } else {
597  blend_line_hv16(p, draw->pixelstep[plane],
598  color->comp[plane].u16[index], alpha,
599  m, mask_linesize, l2depth, w_sub,
600  draw->hsub[plane], draw->vsub[plane],
601  xm0, left, right, top);
602  }
603  p += dst_linesize[plane];
604  m += top * mask_linesize;
605  }
606  if (depth <= 8) {
607  for (int y = 0; y < h_sub; y++) {
608  blend_line_hv(p, draw->pixelstep[plane],
609  color->comp[plane].u8[index], alpha,
610  m, mask_linesize, l2depth, w_sub,
611  draw->hsub[plane], draw->vsub[plane],
612  xm0, left, right, 1 << draw->vsub[plane]);
613  p += dst_linesize[plane];
614  m += mask_linesize << draw->vsub[plane];
615  }
616  } else {
617  for (int y = 0; y < h_sub; y++) {
618  blend_line_hv16(p, draw->pixelstep[plane],
619  color->comp[plane].u16[index], alpha,
620  m, mask_linesize, l2depth, w_sub,
621  draw->hsub[plane], draw->vsub[plane],
622  xm0, left, right, 1 << draw->vsub[plane]);
623  p += dst_linesize[plane];
624  m += mask_linesize << draw->vsub[plane];
625  }
626  }
627  if (bottom) {
628  if (depth <= 8) {
629  blend_line_hv(p, draw->pixelstep[plane],
630  color->comp[plane].u8[index], alpha,
631  m, mask_linesize, l2depth, w_sub,
632  draw->hsub[plane], draw->vsub[plane],
633  xm0, left, right, bottom);
634  } else {
635  blend_line_hv16(p, draw->pixelstep[plane],
636  color->comp[plane].u16[index], alpha,
637  m, mask_linesize, l2depth, w_sub,
638  draw->hsub[plane], draw->vsub[plane],
639  xm0, left, right, bottom);
640  }
641  }
642  }
643  }
644 }
645 
646 int ff_draw_round_to_sub(FFDrawContext *draw, int sub_dir, int round_dir,
647  int value)
648 {
649  unsigned shift = sub_dir ? draw->vsub_max : draw->hsub_max;
650 
651  if (!shift)
652  return value;
653  if (round_dir >= 0)
654  value += round_dir ? (1 << shift) - 1 : 1 << (shift - 1);
655  return (value >> shift) << shift;
656 }
657 
659 {
661  AVFilterFormats *fmts = NULL;
662  int ret;
663 
664  for (enum AVPixelFormat i = 0; av_pix_fmt_desc_get(i); i++)
665  if (ff_draw_init(&draw, i, flags) >= 0 &&
666  (ret = ff_add_format(&fmts, i)) < 0)
667  return NULL;
668  return fmts;
669 }
flags
const SwsFlags flags[]
Definition: swscale.c:61
FFDrawColor
Definition: drawutils.h:51
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:71
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
color
Definition: vf_paletteuse.c:513
comp
static void comp(unsigned char *dst, ptrdiff_t dst_stride, unsigned char *src, ptrdiff_t src_stride, int add)
Definition: eamad.c:79
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:3341
fill_map
static int fill_map(const AVPixFmtDescriptor *desc, uint8_t *map)
Definition: drawutils.c:35
subsampling_bounds
static void subsampling_bounds(int sub, int *x, int *w, int *start, int *end)
Decompose w pixels starting at x into start + (w starting at x) + end with x and w aligned on multipl...
Definition: drawutils.c:306
mask
int mask
Definition: mediacodecdec_common.c:154
pixdesc.h
w
uint8_t w
Definition: llviddspenc.c:38
AVCOL_RANGE_JPEG
@ AVCOL_RANGE_JPEG
Full range content.
Definition: pixfmt.h:750
FFDrawColor::u16
uint16_t u16[8]
Definition: drawutils.h:55
av_csp_luma_coeffs_from_avcsp
const struct AVLumaCoefficients * av_csp_luma_coeffs_from_avcsp(enum AVColorSpace csp)
Retrieves the Luma coefficients necessary to construct a conversion matrix from an enum constant desc...
Definition: csp.c:58
chroma
static av_always_inline void chroma(WaveformContext *s, AVFrame *in, AVFrame *out, int component, int intensity, int offset_y, int offset_x, int column, int mirror, int jobnr, int nb_jobs)
Definition: vf_waveform.c:1639
data
const char data[16]
Definition: mxf.c:149
blend_pixel16
static void blend_pixel16(uint8_t *dst, unsigned src, unsigned alpha, const uint8_t *mask, int mask_linesize, int l2depth, unsigned w, unsigned h, unsigned shift, unsigned xm0)
Definition: drawutils.c:450
RED
@ RED
Definition: drawutils.c:33
AVCOL_SPC_RGB
@ AVCOL_SPC_RGB
order of coefficients is actually GBR, also IEC 61966-2-1 (sRGB), YZX and ST 428-1
Definition: pixfmt.h:674
AVLumaCoefficients
Struct containing luma coefficients to be used for RGB to YUV/YCoCg, or similar calculations.
Definition: csp.h:48
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
hsub
static void hsub(htype *dst, const htype *src, int bins)
Definition: vf_median.c:74
AVFilterFormats
A list of supported formats for one end of a filter link.
Definition: formats.h:64
formats.h
av_pix_fmt_count_planes
int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:3381
AV_PIX_FMT_FLAG_HWACCEL
#define AV_PIX_FMT_FLAG_HWACCEL
Pixel format is an HW accelerated format.
Definition: pixdesc.h:128
colorspace.h
val
static double val(void *priv, double ch)
Definition: aeval.c:77
ff_blend_mask
void ff_blend_mask(FFDrawContext *draw, FFDrawColor *color, uint8_t *dst[], int dst_linesize[], int dst_w, int dst_h, const uint8_t *mask, int mask_linesize, int mask_w, int mask_h, int l2depth, unsigned endianness, int x0, int y0)
Blend an alpha mask with an uniform color.
Definition: drawutils.c:545
AV_PIX_FMT_YUVJ411P
@ AV_PIX_FMT_YUVJ411P
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples) full scale (JPEG), deprecated in favor ...
Definition: pixfmt.h:283
avassert.h
AV_PIX_FMT_YUVJ422P
@ AV_PIX_FMT_YUVJ422P
planar YUV 4:2:2, 16bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV422P and setting col...
Definition: pixfmt.h:86
intreadwrite.h
MAX_PLANES
#define MAX_PLANES
Definition: ffv1.h:44
AV_CEIL_RSHIFT
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:60
format
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 format(the sample packing is implied by the sample format) and sample rate. The lists are not just lists
AVCOL_SPC_SMPTE170M
@ AVCOL_SPC_SMPTE170M
also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
Definition: pixfmt.h:680
pix_fmt
static enum AVPixelFormat pix_fmt
Definition: demux_decode.c:41
ff_copy_rectangle2
void ff_copy_rectangle2(FFDrawContext *draw, uint8_t *dst[], int dst_linesize[], uint8_t *src[], int src_linesize[], int dst_x, int dst_y, int src_x, int src_y, int w, int h)
Copy a rectangle from an image to another.
Definition: drawutils.c:224
FF_DRAW_PROCESS_ALPHA
#define FF_DRAW_PROCESS_ALPHA
Process alpha pixel component.
Definition: drawutils.h:63
blend_line_hv16
static void blend_line_hv16(uint8_t *dst, int dst_delta, unsigned src, unsigned alpha, const uint8_t *mask, int mask_linesize, int l2depth, int w, unsigned hsub, unsigned vsub, int xm, int left, int right, int hband)
Definition: drawutils.c:497
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:40
AV_PIX_FMT_FLAG_ALPHA
#define AV_PIX_FMT_FLAG_ALPHA
The pixel format has an alpha channel.
Definition: pixdesc.h:147
AV_RL16
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:94
ff_draw_init
int ff_draw_init(FFDrawContext *draw, enum AVPixelFormat format, unsigned flags)
Definition: drawutils.c:167
ff_matrix_mul_3x3_vec
void ff_matrix_mul_3x3_vec(double dst[3], const double vec[3], const double mat[3][3])
Definition: colorspace.c:66
AV_PIX_FMT_YUVJ444P
@ AV_PIX_FMT_YUVJ444P
planar YUV 4:4:4, 24bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV444P and setting col...
Definition: pixfmt.h:87
if
if(ret)
Definition: filter_design.txt:179
NULL
#define NULL
Definition: coverity.c:32
GREEN
@ GREEN
Definition: drawutils.c:33
AVComponentDescriptor
Definition: pixdesc.h:30
AV_PIX_FMT_YUVJ420P
@ AV_PIX_FMT_YUVJ420P
planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV420P and setting col...
Definition: pixfmt.h:85
ff_add_format
int ff_add_format(AVFilterFormats **avff, int64_t fmt)
Add fmt to the list of media formats contained in *avff.
Definition: formats.c:504
ff_fill_ayuv_map
int ff_fill_ayuv_map(uint8_t *ayuv_map, enum AVPixelFormat pix_fmt)
Definition: drawutils.c:88
FFDrawColor::u8
uint8_t u8[16]
Definition: drawutils.h:56
clip_interval
static void clip_interval(int wmax, int *x, int *w, int *dx)
Clip interval [x; x+w[ within [0; wmax[.
Definition: drawutils.c:287
AVCOL_RANGE_UNSPECIFIED
@ AVCOL_RANGE_UNSPECIFIED
Definition: pixfmt.h:716
index
int index
Definition: gxfenc.c:90
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
AV_PIX_FMT_FLAG_RGB
#define AV_PIX_FMT_FLAG_RGB
The pixel format contains RGB-like data (as opposed to YUV/grayscale).
Definition: pixdesc.h:136
FFDrawColor::comp
union FFDrawColor::@334 comp[MAX_PLANES]
shift
static int shift(int a, int b)
Definition: bonk.c:261
dst
uint8_t ptrdiff_t const uint8_t ptrdiff_t int intptr_t intptr_t int int16_t * dst
Definition: dsp.h:83
ff_blend_rectangle
void ff_blend_rectangle(FFDrawContext *draw, FFDrawColor *color, uint8_t *dst[], int dst_linesize[], int dst_w, int dst_h, int x0, int y0, int w, int h)
Blend a rectangle with an uniform color.
Definition: drawutils.c:366
ff_draw_init2
int ff_draw_init2(FFDrawContext *draw, enum AVPixelFormat format, enum AVColorSpace csp, enum AVColorRange range, unsigned flags)
Init a draw context.
Definition: drawutils.c:96
color
static const uint32_t color[16+AV_CLASS_CATEGORY_NB]
Definition: log.c:97
ff_fill_rectangle
void ff_fill_rectangle(FFDrawContext *draw, FFDrawColor *color, uint8_t *dst[], int dst_linesize[], int dst_x, int dst_y, int w, int h)
Fill a rectangle with an uniform color.
Definition: drawutils.c:246
AV_PIX_FMT_FLAG_BITSTREAM
#define AV_PIX_FMT_FLAG_BITSTREAM
All values of a component are bit-wise packed end to end.
Definition: pixdesc.h:124
range
enum AVColorRange range
Definition: mediacodec_wrapper.c:2594
AV_WL16
#define AV_WL16(p, v)
Definition: intreadwrite.h:408
csp.h
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
av_pix_fmt_desc_get_id
enum AVPixelFormat av_pix_fmt_desc_get_id(const AVPixFmtDescriptor *desc)
Definition: pixdesc.c:3360
draw
static int draw(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
Definition: avf_showcwt.c:440
AV_PIX_FMT_FLAG_BAYER
#define AV_PIX_FMT_FLAG_BAYER
The pixel format is following a Bayer pattern.
Definition: pixdesc.h:152
ff_fill_rgb2yuv_table
void ff_fill_rgb2yuv_table(const AVLumaCoefficients *coeffs, double rgb2yuv[3][3])
Definition: colorspace.c:125
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
ff_draw_supported_pixel_formats
AVFilterFormats * ff_draw_supported_pixel_formats(unsigned flags)
Return the list of pixel formats supported by the draw functions.
Definition: drawutils.c:658
AVColorSpace
AVColorSpace
YUV colorspace type.
Definition: pixfmt.h:673
ff_draw_round_to_sub
int ff_draw_round_to_sub(FFDrawContext *draw, int sub_dir, int round_dir, int value)
Round a dimension according to subsampling.
Definition: drawutils.c:646
value
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default value
Definition: writing_filters.txt:86
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
AV_PIX_FMT_FLAG_BE
#define AV_PIX_FMT_FLAG_BE
Pixel format is big-endian.
Definition: pixdesc.h:116
AV_PIX_FMT_YUVJ440P
@ AV_PIX_FMT_YUVJ440P
planar YUV 4:4:0 full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV440P and setting color_range
Definition: pixfmt.h:107
FFDrawContext
Definition: drawutils.h:36
AVCOL_SPC_UNSPECIFIED
@ AVCOL_SPC_UNSPECIFIED
Definition: pixfmt.h:676
AVCOL_RANGE_MPEG
@ AVCOL_RANGE_MPEG
Narrow or limited range content.
Definition: pixfmt.h:733
ff_draw_color
void ff_draw_color(FFDrawContext *draw, FFDrawColor *color, const uint8_t rgba[4])
Prepare a color.
Definition: drawutils.c:172
BLUE
@ BLUE
Definition: drawutils.c:33
ret
ret
Definition: filter_design.txt:187
blend_pixel
static void blend_pixel(uint8_t *dst, unsigned src, unsigned alpha, const uint8_t *mask, int mask_linesize, int l2depth, unsigned w, unsigned h, unsigned shift, unsigned xm0)
Definition: drawutils.c:474
pos
unsigned int pos
Definition: spdifenc.c:414
left
Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2] ... the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so ...,+,-,+,-,+,+,-,+,-,+,... hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32 - hcoeff[1] - hcoeff[2] - ... a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2} an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||......... intra?||||:Block01 :yes no||||:Block02 :....... ..........||||:Block03 ::y DC ::ref index:||||:Block04 ::cb DC ::motion x :||||......... :cr DC ::motion y :||||....... ..........|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------ ------------ ------------|||Y subbands||Cb subbands||Cr subbands||||--- ---||--- ---||--- ---|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------ ------------ ------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction ------------|\ Dequantization ------------------- \||Reference frames|\ IDWT|------- -------|Motion \|||Frame 0||Frame 1||Compensation . OBMC v -------|------- -------|--------------. \------> Frame n output Frame Frame<----------------------------------/|...|------------------- Range Coder:============Binary Range Coder:------------------- The implemented range coder is an adapted version based upon "Range encoding: an algorithm for removing redundancy from a digitised message." by G. N. N. Martin. The symbols encoded by the Snow range coder are bits(0|1). The associated probabilities are not fix but change depending on the symbol mix seen so far. bit seen|new state ---------+----------------------------------------------- 0|256 - state_transition_table[256 - old_state];1|state_transition_table[old_state];state_transition_table={ 0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:------------------------- FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1. the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled left
Definition: snow.txt:386
AV_PIX_FMT_FLAG_XYZ
#define AV_PIX_FMT_FLAG_XYZ
The pixel format contains XYZ-like data (as opposed to YUV/RGB/grayscale).
Definition: pixdesc.h:163
blend_line
static void blend_line(uint8_t *dst, unsigned src, unsigned alpha, int dx, int w, unsigned hsub, int left, int right)
Definition: drawutils.c:321
AV_PIX_FMT_FLAG_PLANAR
#define AV_PIX_FMT_FLAG_PLANAR
At least one pixel component is not in the first data plane.
Definition: pixdesc.h:132
desc
const char * desc
Definition: libsvtav1.c:79
avutil.h
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
map
const VDPAUPixFmtMap * map
Definition: hwcontext_vdpau.c:71
alpha
static const int16_t alpha[]
Definition: ilbcdata.h:55
pointer_at
static uint8_t * pointer_at(FFDrawContext *draw, uint8_t *data[], int linesize[], int plane, int x, int y)
Definition: drawutils.c:216
ff_fill_rgba_map
int ff_fill_rgba_map(uint8_t *rgba_map, enum AVPixelFormat pix_fmt)
Definition: drawutils.c:80
blend_line_hv
static void blend_line_hv(uint8_t *dst, int dst_delta, unsigned src, unsigned alpha, const uint8_t *mask, int mask_linesize, int l2depth, int w, unsigned hsub, unsigned vsub, int xm, int left, int right, int hband)
Definition: drawutils.c:521
blend_line16
static void blend_line16(uint8_t *dst, unsigned src, unsigned alpha, int dx, int w, unsigned hsub, int left, int right)
Definition: drawutils.c:342
ALPHA
@ ALPHA
Definition: drawutils.c:33
h
h
Definition: vp9dsp_template.c:2070
drawutils.h
av_bswap16
#define av_bswap16
Definition: bswap.h:28
AVColorRange
AVColorRange
Visual content value range.
Definition: pixfmt.h:715
AV_PIX_FMT_FLAG_PAL
#define AV_PIX_FMT_FLAG_PAL
Pixel format has a palette in data[1], values are indexes in this palette.
Definition: pixdesc.h:120
src
#define src
Definition: vp8dsp.c:248