Libav
dvdsubdec.c
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1 /*
2  * DVD subtitle decoding
3  * Copyright (c) 2005 Fabrice Bellard
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "avcodec.h"
23 #include "get_bits.h"
24 #include "internal.h"
25 
26 #include "libavutil/attributes.h"
27 #include "libavutil/colorspace.h"
28 #include "libavutil/imgutils.h"
29 #include "libavutil/avstring.h"
30 
31 typedef struct DVDSubContext {
32  uint32_t palette[16];
35 
36 static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values)
37 {
39  uint8_t r, g, b;
40  int i, y, cb, cr;
41  int r_add, g_add, b_add;
42 
43  for (i = num_values; i > 0; i--) {
44  y = *ycbcr++;
45  cr = *ycbcr++;
46  cb = *ycbcr++;
47  YUV_TO_RGB1_CCIR(cb, cr);
48  YUV_TO_RGB2_CCIR(r, g, b, y);
49  *rgba++ = (*alpha++ << 24) | (r << 16) | (g << 8) | b;
50  }
51 }
52 
53 static int decode_run_2bit(GetBitContext *gb, int *color)
54 {
55  unsigned int v, t;
56 
57  v = 0;
58  for (t = 1; v < t && t <= 0x40; t <<= 2)
59  v = (v << 4) | get_bits(gb, 4);
60  *color = v & 3;
61  if (v < 4) { /* Code for fill rest of line */
62  return INT_MAX;
63  }
64  return v >> 2;
65 }
66 
67 static int decode_run_8bit(GetBitContext *gb, int *color)
68 {
69  int len;
70  int has_run = get_bits1(gb);
71  if (get_bits1(gb))
72  *color = get_bits(gb, 8);
73  else
74  *color = get_bits(gb, 2);
75  if (has_run) {
76  if (get_bits1(gb)) {
77  len = get_bits(gb, 7);
78  if (len == 0)
79  len = INT_MAX;
80  else
81  len += 9;
82  } else
83  len = get_bits(gb, 3) + 2;
84  } else
85  len = 1;
86  return len;
87 }
88 
89 static int decode_rle(uint8_t *bitmap, int linesize, int w, int h,
90  const uint8_t *buf, int start, int buf_size, int is_8bit)
91 {
92  GetBitContext gb;
93  int bit_len;
94  int x, y, len, color;
95  uint8_t *d;
96 
97  bit_len = (buf_size - start) * 8;
98  init_get_bits(&gb, buf + start, bit_len);
99 
100  x = 0;
101  y = 0;
102  d = bitmap;
103  for(;;) {
104  if (get_bits_count(&gb) > bit_len)
105  return -1;
106  if (is_8bit)
107  len = decode_run_8bit(&gb, &color);
108  else
109  len = decode_run_2bit(&gb, &color);
110  len = FFMIN(len, w - x);
111  memset(d + x, color, len);
112  x += len;
113  if (x >= w) {
114  y++;
115  if (y >= h)
116  break;
117  d += linesize;
118  x = 0;
119  /* byte align */
120  align_get_bits(&gb);
121  }
122  }
123  return 0;
124 }
125 
126 static void guess_palette(DVDSubContext* ctx,
127  uint32_t *rgba_palette,
128  uint8_t *colormap,
129  uint8_t *alpha,
130  uint32_t subtitle_color)
131 {
132  uint8_t color_used[16] = { 0 };
133  int nb_opaque_colors, i, level, j, r, g, b;
134 
135  if (ctx->has_palette) {
136  for (i = 0; i < 4; i++)
137  rgba_palette[i] = (ctx->palette[colormap[i]] & 0x00ffffff)
138  | ((alpha[i] * 17) << 24);
139  return;
140  }
141 
142  for(i = 0; i < 4; i++)
143  rgba_palette[i] = 0;
144 
145  nb_opaque_colors = 0;
146  for(i = 0; i < 4; i++) {
147  if (alpha[i] != 0 && !color_used[colormap[i]]) {
148  color_used[colormap[i]] = 1;
149  nb_opaque_colors++;
150  }
151  }
152 
153  if (nb_opaque_colors == 0)
154  return;
155 
156  j = nb_opaque_colors;
157  memset(color_used, 0, 16);
158  for(i = 0; i < 4; i++) {
159  if (alpha[i] != 0) {
160  if (!color_used[colormap[i]]) {
161  level = (0xff * j) / nb_opaque_colors;
162  r = (((subtitle_color >> 16) & 0xff) * level) >> 8;
163  g = (((subtitle_color >> 8) & 0xff) * level) >> 8;
164  b = (((subtitle_color >> 0) & 0xff) * level) >> 8;
165  rgba_palette[i] = b | (g << 8) | (r << 16) | ((alpha[i] * 17) << 24);
166  color_used[colormap[i]] = (i + 1);
167  j--;
168  } else {
169  rgba_palette[i] = (rgba_palette[color_used[colormap[i]] - 1] & 0x00ffffff) |
170  ((alpha[i] * 17) << 24);
171  }
172  }
173  }
174 }
175 
176 #define READ_OFFSET(a) (big_offsets ? AV_RB32(a) : AV_RB16(a))
177 
178 static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header,
179  const uint8_t *buf, int buf_size)
180 {
181  int cmd_pos, pos, cmd, x1, y1, x2, y2, offset1, offset2, next_cmd_pos;
182  int big_offsets, offset_size, is_8bit = 0;
183  const uint8_t *yuv_palette = 0;
184  uint8_t colormap[4] = { 0 }, alpha[256] = { 0 };
185  int date;
186  int i;
187  int is_menu = 0;
188 
189  if (buf_size < 10)
190  return -1;
191  memset(sub_header, 0, sizeof(*sub_header));
192 
193  if (AV_RB16(buf) == 0) { /* HD subpicture with 4-byte offsets */
194  big_offsets = 1;
195  offset_size = 4;
196  cmd_pos = 6;
197  } else {
198  big_offsets = 0;
199  offset_size = 2;
200  cmd_pos = 2;
201  }
202 
203  cmd_pos = READ_OFFSET(buf + cmd_pos);
204 
205  while (cmd_pos > 0 && cmd_pos < buf_size - 2 - offset_size) {
206  date = AV_RB16(buf + cmd_pos);
207  next_cmd_pos = READ_OFFSET(buf + cmd_pos + 2);
208  av_dlog(NULL, "cmd_pos=0x%04x next=0x%04x date=%d\n",
209  cmd_pos, next_cmd_pos, date);
210  pos = cmd_pos + 2 + offset_size;
211  offset1 = -1;
212  offset2 = -1;
213  x1 = y1 = x2 = y2 = 0;
214  while (pos < buf_size) {
215  cmd = buf[pos++];
216  av_dlog(NULL, "cmd=%02x\n", cmd);
217  switch(cmd) {
218  case 0x00:
219  /* menu subpicture */
220  is_menu = 1;
221  break;
222  case 0x01:
223  /* set start date */
224  sub_header->start_display_time = (date << 10) / 90;
225  break;
226  case 0x02:
227  /* set end date */
228  sub_header->end_display_time = (date << 10) / 90;
229  break;
230  case 0x03:
231  /* set colormap */
232  if ((buf_size - pos) < 2)
233  goto fail;
234  colormap[3] = buf[pos] >> 4;
235  colormap[2] = buf[pos] & 0x0f;
236  colormap[1] = buf[pos + 1] >> 4;
237  colormap[0] = buf[pos + 1] & 0x0f;
238  pos += 2;
239  break;
240  case 0x04:
241  /* set alpha */
242  if ((buf_size - pos) < 2)
243  goto fail;
244  alpha[3] = buf[pos] >> 4;
245  alpha[2] = buf[pos] & 0x0f;
246  alpha[1] = buf[pos + 1] >> 4;
247  alpha[0] = buf[pos + 1] & 0x0f;
248  pos += 2;
249  av_dlog(NULL, "alpha=%x%x%x%x\n", alpha[0],alpha[1],alpha[2],alpha[3]);
250  break;
251  case 0x05:
252  case 0x85:
253  if ((buf_size - pos) < 6)
254  goto fail;
255  x1 = (buf[pos] << 4) | (buf[pos + 1] >> 4);
256  x2 = ((buf[pos + 1] & 0x0f) << 8) | buf[pos + 2];
257  y1 = (buf[pos + 3] << 4) | (buf[pos + 4] >> 4);
258  y2 = ((buf[pos + 4] & 0x0f) << 8) | buf[pos + 5];
259  if (cmd & 0x80)
260  is_8bit = 1;
261  av_dlog(NULL, "x1=%d x2=%d y1=%d y2=%d\n", x1, x2, y1, y2);
262  pos += 6;
263  break;
264  case 0x06:
265  if ((buf_size - pos) < 4)
266  goto fail;
267  offset1 = AV_RB16(buf + pos);
268  offset2 = AV_RB16(buf + pos + 2);
269  av_dlog(NULL, "offset1=0x%04x offset2=0x%04x\n", offset1, offset2);
270  pos += 4;
271  break;
272  case 0x86:
273  if ((buf_size - pos) < 8)
274  goto fail;
275  offset1 = AV_RB32(buf + pos);
276  offset2 = AV_RB32(buf + pos + 4);
277  av_dlog(NULL, "offset1=0x%04x offset2=0x%04x\n", offset1, offset2);
278  pos += 8;
279  break;
280 
281  case 0x83:
282  /* HD set palette */
283  if ((buf_size - pos) < 768)
284  goto fail;
285  yuv_palette = buf + pos;
286  pos += 768;
287  break;
288  case 0x84:
289  /* HD set contrast (alpha) */
290  if ((buf_size - pos) < 256)
291  goto fail;
292  for (i = 0; i < 256; i++)
293  alpha[i] = 0xFF - buf[pos+i];
294  pos += 256;
295  break;
296 
297  case 0xff:
298  goto the_end;
299  default:
300  av_dlog(NULL, "unrecognised subpicture command 0x%x\n", cmd);
301  goto the_end;
302  }
303  }
304  the_end:
305  if (offset1 >= 0) {
306  int w, h;
307  uint8_t *bitmap;
308 
309  /* decode the bitmap */
310  w = x2 - x1 + 1;
311  if (w < 0)
312  w = 0;
313  h = y2 - y1;
314  if (h < 0)
315  h = 0;
316  if (w > 0 && h > 0) {
317  if (sub_header->rects) {
318  for (i = 0; i < sub_header->num_rects; i++) {
319  av_freep(&sub_header->rects[i]->pict.data[0]);
320  av_freep(&sub_header->rects[i]->pict.data[1]);
321  av_freep(&sub_header->rects[i]);
322  }
323  av_freep(&sub_header->rects);
324  sub_header->num_rects = 0;
325  }
326 
327  bitmap = av_malloc(w * h);
328  sub_header->rects = av_mallocz(sizeof(*sub_header->rects));
329  sub_header->rects[0] = av_mallocz(sizeof(AVSubtitleRect));
330  sub_header->num_rects = 1;
331  sub_header->rects[0]->pict.data[0] = bitmap;
332  decode_rle(bitmap, w * 2, w, (h + 1) / 2,
333  buf, offset1, buf_size, is_8bit);
334  decode_rle(bitmap + w, w * 2, w, h / 2,
335  buf, offset2, buf_size, is_8bit);
336  sub_header->rects[0]->pict.data[1] = av_mallocz(AVPALETTE_SIZE);
337  if (is_8bit) {
338  if (yuv_palette == 0)
339  goto fail;
340  sub_header->rects[0]->nb_colors = 256;
341  yuv_a_to_rgba(yuv_palette, alpha, (uint32_t*)sub_header->rects[0]->pict.data[1], 256);
342  } else {
343  sub_header->rects[0]->nb_colors = 4;
344  guess_palette(ctx,
345  (uint32_t*)sub_header->rects[0]->pict.data[1],
346  colormap, alpha, 0xffff00);
347  }
348  sub_header->rects[0]->x = x1;
349  sub_header->rects[0]->y = y1;
350  sub_header->rects[0]->w = w;
351  sub_header->rects[0]->h = h;
352  sub_header->rects[0]->type = SUBTITLE_BITMAP;
353  sub_header->rects[0]->pict.linesize[0] = w;
354  }
355  }
356  if (next_cmd_pos == cmd_pos)
357  break;
358  cmd_pos = next_cmd_pos;
359  }
360  if (sub_header->num_rects > 0)
361  return is_menu;
362  fail:
363  if (!sub_header->rects) {
364  for (i = 0; i < sub_header->num_rects; i++) {
365  av_freep(&sub_header->rects[i]->pict.data[0]);
366  av_freep(&sub_header->rects[i]->pict.data[1]);
367  av_freep(&sub_header->rects[i]);
368  }
369  av_freep(&sub_header->rects);
370  sub_header->num_rects = 0;
371  }
372  return -1;
373 }
374 
375 static int is_transp(const uint8_t *buf, int pitch, int n,
376  const uint8_t *transp_color)
377 {
378  int i;
379  for(i = 0; i < n; i++) {
380  if (!transp_color[*buf])
381  return 0;
382  buf += pitch;
383  }
384  return 1;
385 }
386 
387 /* return 0 if empty rectangle, 1 if non empty */
389 {
390  uint8_t transp_color[256] = { 0 };
391  int y1, y2, x1, x2, y, w, h, i;
392  uint8_t *bitmap;
393 
394  if (s->num_rects == 0 || !s->rects || s->rects[0]->w <= 0 || s->rects[0]->h <= 0)
395  return 0;
396 
397  for(i = 0; i < s->rects[0]->nb_colors; i++) {
398  if ((((uint32_t*)s->rects[0]->pict.data[1])[i] >> 24) == 0)
399  transp_color[i] = 1;
400  }
401  y1 = 0;
402  while (y1 < s->rects[0]->h && is_transp(s->rects[0]->pict.data[0] + y1 * s->rects[0]->pict.linesize[0],
403  1, s->rects[0]->w, transp_color))
404  y1++;
405  if (y1 == s->rects[0]->h) {
406  av_freep(&s->rects[0]->pict.data[0]);
407  s->rects[0]->w = s->rects[0]->h = 0;
408  return 0;
409  }
410 
411  y2 = s->rects[0]->h - 1;
412  while (y2 > 0 && is_transp(s->rects[0]->pict.data[0] + y2 * s->rects[0]->pict.linesize[0], 1,
413  s->rects[0]->w, transp_color))
414  y2--;
415  x1 = 0;
416  while (x1 < (s->rects[0]->w - 1) && is_transp(s->rects[0]->pict.data[0] + x1, s->rects[0]->pict.linesize[0],
417  s->rects[0]->h, transp_color))
418  x1++;
419  x2 = s->rects[0]->w - 1;
420  while (x2 > 0 && is_transp(s->rects[0]->pict.data[0] + x2, s->rects[0]->pict.linesize[0], s->rects[0]->h,
421  transp_color))
422  x2--;
423  w = x2 - x1 + 1;
424  h = y2 - y1 + 1;
425  bitmap = av_malloc(w * h);
426  if (!bitmap)
427  return 1;
428  for(y = 0; y < h; y++) {
429  memcpy(bitmap + w * y, s->rects[0]->pict.data[0] + x1 + (y1 + y) * s->rects[0]->pict.linesize[0], w);
430  }
431  av_freep(&s->rects[0]->pict.data[0]);
432  s->rects[0]->pict.data[0] = bitmap;
433  s->rects[0]->pict.linesize[0] = w;
434  s->rects[0]->w = w;
435  s->rects[0]->h = h;
436  s->rects[0]->x += x1;
437  s->rects[0]->y += y1;
438  return 1;
439 }
440 
441 #ifdef DEBUG
442 static void ppm_save(const char *filename, uint8_t *bitmap, int w, int h,
443  uint32_t *rgba_palette)
444 {
445  int x, y, v;
446  FILE *f;
447 
448  f = fopen(filename, "w");
449  if (!f) {
450  perror(filename);
451  exit(1);
452  }
453  fprintf(f, "P6\n"
454  "%d %d\n"
455  "%d\n",
456  w, h, 255);
457  for(y = 0; y < h; y++) {
458  for(x = 0; x < w; x++) {
459  v = rgba_palette[bitmap[y * w + x]];
460  putc((v >> 16) & 0xff, f);
461  putc((v >> 8) & 0xff, f);
462  putc((v >> 0) & 0xff, f);
463  }
464  }
465  fclose(f);
466 }
467 #endif
468 
469 static int dvdsub_decode(AVCodecContext *avctx,
470  void *data, int *data_size,
471  AVPacket *avpkt)
472 {
473  DVDSubContext *ctx = avctx->priv_data;
474  const uint8_t *buf = avpkt->data;
475  int buf_size = avpkt->size;
476  AVSubtitle *sub = data;
477  int is_menu;
478 
479  is_menu = decode_dvd_subtitles(ctx, sub, buf, buf_size);
480 
481  if (is_menu < 0) {
482  no_subtitle:
483  *data_size = 0;
484 
485  return buf_size;
486  }
487  if (!is_menu && find_smallest_bounding_rectangle(sub) == 0)
488  goto no_subtitle;
489 
490 #if defined(DEBUG)
491  av_dlog(NULL, "start=%d ms end =%d ms\n",
492  sub->start_display_time,
493  sub->end_display_time);
494  ppm_save("/tmp/a.ppm", sub->rects[0]->pict.data[0],
495  sub->rects[0]->w, sub->rects[0]->h, sub->rects[0]->pict.data[1]);
496 #endif
497 
498  *data_size = 1;
499  return buf_size;
500 }
501 
503 {
504  DVDSubContext *ctx = avctx->priv_data;
505  char *data, *cur;
506 
507  if (!avctx->extradata || !avctx->extradata_size)
508  return 0;
509 
510  data = av_malloc(avctx->extradata_size + 1);
511  if (!data)
512  return AVERROR(ENOMEM);
513  memcpy(data, avctx->extradata, avctx->extradata_size);
514  data[avctx->extradata_size] = '\0';
515  cur = data;
516 
517  while (*cur) {
518  if (strncmp("palette:", cur, 8) == 0) {
519  int i;
520  char *p = cur + 8;
521  ctx->has_palette = 1;
522  for (i = 0; i < 16; i++) {
523  ctx->palette[i] = strtoul(p, &p, 16);
524  while (*p == ',' || av_isspace(*p))
525  p++;
526  }
527  } else if (!strncmp("size:", cur, 5)) {
528  int w, h;
529  if (sscanf(cur + 5, "%dx%d", &w, &h) == 2) {
530  int ret = ff_set_dimensions(avctx, w, h);
531  if (ret < 0)
532  return ret;
533  }
534  }
535  cur += strcspn(cur, "\n\r");
536  cur += strspn(cur, "\n\r");
537  }
538  av_free(data);
539  return 0;
540 }
541 
543  .name = "dvdsub",
544  .long_name = NULL_IF_CONFIG_SMALL("DVD subtitles"),
545  .type = AVMEDIA_TYPE_SUBTITLE,
547  .priv_data_size = sizeof(DVDSubContext),
548  .init = dvdsub_init,
550 };
#define AVPALETTE_SIZE
Definition: avcodec.h:3029
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:62
int linesize[AV_NUM_DATA_POINTERS]
number of bytes per line
Definition: avcodec.h:3022
int x
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:3053
misc image utilities
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:240
#define YUV_TO_RGB1_CCIR(cb1, cr1)
Definition: colorspace.h:34
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:133
int nb_colors
number of colors in pict, undefined when pict is not set
Definition: avcodec.h:3057
int size
Definition: avcodec.h:968
#define MAX_NEG_CROP
Definition: mathops.h:30
Various defines for YUV<->RGB conversion.
unsigned num_rects
Definition: avcodec.h:3081
av_dlog(ac->avr,"%d samples - audio_convert: %s to %s (%s)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic?ac->func_descr_generic:ac->func_descr)
uint32_t palette[16]
Definition: dvdsubdec.c:32
AVCodec.
Definition: avcodec.h:2790
Macro definitions for various function/variable attributes.
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:198
AVSubtitleRect ** rects
Definition: avcodec.h:3082
int w
width of pict, undefined when pict is not set
Definition: avcodec.h:3055
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:275
uint8_t
#define av_cold
Definition: attributes.h:66
uint8_t * data[AV_NUM_DATA_POINTERS]
Definition: avcodec.h:3021
#define AV_RB32
Definition: intreadwrite.h:130
#define b
Definition: input.c:52
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1158
static void guess_palette(DVDSubContext *ctx, uint32_t *rgba_palette, uint8_t *colormap, uint8_t *alpha, uint32_t subtitle_color)
Definition: dvdsubdec.c:126
const char data[16]
Definition: mxf.c:70
uint8_t * data
Definition: avcodec.h:967
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:194
#define READ_OFFSET(a)
Definition: dvdsubdec.c:176
bitstream reader API header.
int h
height of pict, undefined when pict is not set
Definition: avcodec.h:3056
static av_cold int dvdsub_init(AVCodecContext *avctx)
Definition: dvdsubdec.c:502
#define cm
Definition: dvbsubdec.c:34
#define r
Definition: input.c:51
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:186
int y
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:3054
#define AV_RB16
Definition: intreadwrite.h:53
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:150
g
Definition: yuv2rgb.c:535
const char * name
Name of the codec implementation.
Definition: avcodec.h:2797
int av_isspace(int c)
Locale-independent conversion of ASCII isspace.
Definition: avstring.c:225
uint32_t end_display_time
Definition: avcodec.h:3080
static int decode_run_8bit(GetBitContext *gb, int *color)
Definition: dvdsubdec.c:67
A bitmap, pict will be set.
Definition: avcodec.h:3035
AVPicture pict
data+linesize for the bitmap of this subtitle.
Definition: avcodec.h:3063
#define FFMIN(a, b)
Definition: common.h:57
static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values)
Definition: dvdsubdec.c:36
static int is_transp(const uint8_t *buf, int pitch, int n, const uint8_t *transp_color)
Definition: dvdsubdec.c:375
int has_palette
Definition: dvdsubdec.c:33
AVCodec ff_dvdsub_decoder
Definition: dvdsubdec.c:542
NULL
Definition: eval.c:55
Libavcodec external API header.
main external API structure.
Definition: avcodec.h:1044
static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header, const uint8_t *buf, int buf_size)
Definition: dvdsubdec.c:178
int extradata_size
Definition: avcodec.h:1159
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:271
#define YUV_TO_RGB2_CCIR(r, g, b, y1)
Definition: colorspace.h:44
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:375
static int decode_run_2bit(GetBitContext *gb, int *color)
Definition: dvdsubdec.c:53
uint8_t level
Definition: svq3.c:147
static int find_smallest_bounding_rectangle(AVSubtitle *s)
Definition: dvdsubdec.c:388
common internal api header.
uint32_t start_display_time
Definition: avcodec.h:3079
#define ff_crop_tab
static const uint8_t color[]
Definition: log.c:55
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:499
void * priv_data
Definition: avcodec.h:1086
int len
static int dvdsub_decode(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
Definition: dvdsubdec.c:469
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:416
enum AVSubtitleType type
Definition: avcodec.h:3064
This structure stores compressed data.
Definition: avcodec.h:944
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:205
static int decode_rle(uint8_t *bitmap, int linesize, int w, int h, const uint8_t *buf, int start, int buf_size, int is_8bit)
Definition: dvdsubdec.c:89