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dvdsubdec.c
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1 /*
2  * DVD subtitle decoding
3  * Copyright (c) 2005 Fabrice Bellard
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 "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/opt.h"
29 #include "libavutil/imgutils.h"
30 #include "libavutil/avstring.h"
31 #include "libavutil/bswap.h"
32 
33 typedef struct DVDSubContext
34 {
35  AVClass *class;
36  uint32_t palette[16];
37  char *palette_str;
38  char *ifo_str;
41  uint8_t alpha[256];
42  uint8_t buf[0x10000];
43  int buf_size;
46 #ifdef DEBUG
47  int sub_id;
48 #endif
50 
51 static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values)
52 {
54  uint8_t r, g, b;
55  int i, y, cb, cr;
56  int r_add, g_add, b_add;
57 
58  for (i = num_values; i > 0; i--) {
59  y = *ycbcr++;
60  cr = *ycbcr++;
61  cb = *ycbcr++;
62  YUV_TO_RGB1_CCIR(cb, cr);
63  YUV_TO_RGB2_CCIR(r, g, b, y);
64  *rgba++ = ((unsigned)*alpha++ << 24) | (r << 16) | (g << 8) | b;
65  }
66 }
67 
68 static int decode_run_2bit(GetBitContext *gb, int *color)
69 {
70  unsigned int v, t;
71 
72  v = 0;
73  for (t = 1; v < t && t <= 0x40; t <<= 2)
74  v = (v << 4) | get_bits(gb, 4);
75  *color = v & 3;
76  if (v < 4) { /* Code for fill rest of line */
77  return INT_MAX;
78  }
79  return v >> 2;
80 }
81 
82 static int decode_run_8bit(GetBitContext *gb, int *color)
83 {
84  int len;
85  int has_run = get_bits1(gb);
86  *color = get_bits(gb, 2 + 6*get_bits1(gb));
87  if (has_run) {
88  if (get_bits1(gb)) {
89  len = get_bits(gb, 7);
90  if (len == 0)
91  len = INT_MAX;
92  else
93  len += 9;
94  } else
95  len = get_bits(gb, 3) + 2;
96  } else
97  len = 1;
98  return len;
99 }
100 
101 static int decode_rle(uint8_t *bitmap, int linesize, int w, int h, uint8_t used_color[256],
102  const uint8_t *buf, int start, int buf_size, int is_8bit)
103 {
104  GetBitContext gb;
105  int bit_len;
106  int x, y, len, color;
107  uint8_t *d;
108 
109  if (start >= buf_size)
110  return -1;
111 
112  if (w <= 0 || h <= 0)
113  return -1;
114 
115  bit_len = (buf_size - start) * 8;
116  init_get_bits(&gb, buf + start, bit_len);
117 
118  x = 0;
119  y = 0;
120  d = bitmap;
121  for(;;) {
122  if (get_bits_count(&gb) > bit_len)
123  return -1;
124  if (is_8bit)
125  len = decode_run_8bit(&gb, &color);
126  else
127  len = decode_run_2bit(&gb, &color);
128  if (len != INT_MAX && len > w - x)
129  return AVERROR_INVALIDDATA;
130  len = FFMIN(len, w - x);
131  memset(d + x, color, len);
132  used_color[color] = 1;
133  x += len;
134  if (x >= w) {
135  y++;
136  if (y >= h)
137  break;
138  d += linesize;
139  x = 0;
140  /* byte align */
141  align_get_bits(&gb);
142  }
143  }
144  return 0;
145 }
146 
148  uint32_t *rgba_palette,
149  uint32_t subtitle_color)
150 {
151  static const uint8_t level_map[4][4] = {
152  // this configuration (full range, lowest to highest) in tests
153  // seemed most common, so assume this
154  {0xff},
155  {0x00, 0xff},
156  {0x00, 0x80, 0xff},
157  {0x00, 0x55, 0xaa, 0xff},
158  };
159  uint8_t color_used[16] = { 0 };
160  int nb_opaque_colors, i, level, j, r, g, b;
161  uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;
162 
163  if(ctx->has_palette) {
164  for(i = 0; i < 4; i++)
165  rgba_palette[i] = (ctx->palette[colormap[i]] & 0x00ffffff)
166  | ((alpha[i] * 17U) << 24);
167  return;
168  }
169 
170  for(i = 0; i < 4; i++)
171  rgba_palette[i] = 0;
172 
173  nb_opaque_colors = 0;
174  for(i = 0; i < 4; i++) {
175  if (alpha[i] != 0 && !color_used[colormap[i]]) {
176  color_used[colormap[i]] = 1;
177  nb_opaque_colors++;
178  }
179  }
180 
181  if (nb_opaque_colors == 0)
182  return;
183 
184  j = 0;
185  memset(color_used, 0, 16);
186  for(i = 0; i < 4; i++) {
187  if (alpha[i] != 0) {
188  if (!color_used[colormap[i]]) {
189  level = level_map[nb_opaque_colors - 1][j];
190  r = (((subtitle_color >> 16) & 0xff) * level) >> 8;
191  g = (((subtitle_color >> 8) & 0xff) * level) >> 8;
192  b = (((subtitle_color >> 0) & 0xff) * level) >> 8;
193  rgba_palette[i] = b | (g << 8) | (r << 16) | ((alpha[i] * 17U) << 24);
194  color_used[colormap[i]] = (i + 1);
195  j++;
196  } else {
197  rgba_palette[i] = (rgba_palette[color_used[colormap[i]] - 1] & 0x00ffffff) |
198  ((alpha[i] * 17U) << 24);
199  }
200  }
201  }
202 }
203 
204 static void reset_rects(AVSubtitle *sub_header)
205 {
206  int i;
207 
208  if (sub_header->rects) {
209  for (i = 0; i < sub_header->num_rects; i++) {
210  av_freep(&sub_header->rects[i]->data[0]);
211  av_freep(&sub_header->rects[i]->data[1]);
212  av_freep(&sub_header->rects[i]);
213  }
214  av_freep(&sub_header->rects);
215  sub_header->num_rects = 0;
216  }
217 }
218 
219 #define READ_OFFSET(a) (big_offsets ? AV_RB32(a) : AV_RB16(a))
220 
222  const uint8_t *buf, int buf_size)
223 {
224  int cmd_pos, pos, cmd, x1, y1, x2, y2, next_cmd_pos;
225  int big_offsets, offset_size, is_8bit = 0;
226  const uint8_t *yuv_palette = NULL;
227  uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;
228  int date;
229  int i;
230  int is_menu = 0;
231  uint32_t size;
232  int64_t offset1, offset2;
233 
234  if (buf_size < 10)
235  return -1;
236 
237  if (AV_RB16(buf) == 0) { /* HD subpicture with 4-byte offsets */
238  big_offsets = 1;
239  offset_size = 4;
240  cmd_pos = 6;
241  } else {
242  big_offsets = 0;
243  offset_size = 2;
244  cmd_pos = 2;
245  }
246 
247  size = READ_OFFSET(buf + (big_offsets ? 2 : 0));
248  cmd_pos = READ_OFFSET(buf + cmd_pos);
249 
250  if (cmd_pos < 0 || cmd_pos > buf_size - 2 - offset_size) {
251  if (cmd_pos > size) {
252  av_log(ctx, AV_LOG_ERROR, "Discarding invalid packet\n");
253  return 0;
254  }
255  return AVERROR(EAGAIN);
256  }
257 
258  while (cmd_pos > 0 && cmd_pos < buf_size - 2 - offset_size) {
259  date = AV_RB16(buf + cmd_pos);
260  next_cmd_pos = READ_OFFSET(buf + cmd_pos + 2);
261  ff_dlog(NULL, "cmd_pos=0x%04x next=0x%04x date=%d\n",
262  cmd_pos, next_cmd_pos, date);
263  pos = cmd_pos + 2 + offset_size;
264  offset1 = -1;
265  offset2 = -1;
266  x1 = y1 = x2 = y2 = 0;
267  while (pos < buf_size) {
268  cmd = buf[pos++];
269  ff_dlog(NULL, "cmd=%02x\n", cmd);
270  switch(cmd) {
271  case 0x00:
272  /* menu subpicture */
273  is_menu = 1;
274  break;
275  case 0x01:
276  /* set start date */
277  sub_header->start_display_time = (date << 10) / 90;
278  break;
279  case 0x02:
280  /* set end date */
281  sub_header->end_display_time = (date << 10) / 90;
282  break;
283  case 0x03:
284  /* set colormap */
285  if ((buf_size - pos) < 2)
286  goto fail;
287  colormap[3] = buf[pos] >> 4;
288  colormap[2] = buf[pos] & 0x0f;
289  colormap[1] = buf[pos + 1] >> 4;
290  colormap[0] = buf[pos + 1] & 0x0f;
291  pos += 2;
292  break;
293  case 0x04:
294  /* set alpha */
295  if ((buf_size - pos) < 2)
296  goto fail;
297  alpha[3] = buf[pos] >> 4;
298  alpha[2] = buf[pos] & 0x0f;
299  alpha[1] = buf[pos + 1] >> 4;
300  alpha[0] = buf[pos + 1] & 0x0f;
301  pos += 2;
302  ff_dlog(NULL, "alpha=%x%x%x%x\n", alpha[0],alpha[1],alpha[2],alpha[3]);
303  break;
304  case 0x05:
305  case 0x85:
306  if ((buf_size - pos) < 6)
307  goto fail;
308  x1 = (buf[pos] << 4) | (buf[pos + 1] >> 4);
309  x2 = ((buf[pos + 1] & 0x0f) << 8) | buf[pos + 2];
310  y1 = (buf[pos + 3] << 4) | (buf[pos + 4] >> 4);
311  y2 = ((buf[pos + 4] & 0x0f) << 8) | buf[pos + 5];
312  if (cmd & 0x80)
313  is_8bit = 1;
314  ff_dlog(NULL, "x1=%d x2=%d y1=%d y2=%d\n", x1, x2, y1, y2);
315  pos += 6;
316  break;
317  case 0x06:
318  if ((buf_size - pos) < 4)
319  goto fail;
320  offset1 = AV_RB16(buf + pos);
321  offset2 = AV_RB16(buf + pos + 2);
322  ff_dlog(NULL, "offset1=0x%04"PRIx64" offset2=0x%04"PRIx64"\n", offset1, offset2);
323  pos += 4;
324  break;
325  case 0x86:
326  if ((buf_size - pos) < 8)
327  goto fail;
328  offset1 = AV_RB32(buf + pos);
329  offset2 = AV_RB32(buf + pos + 4);
330  ff_dlog(NULL, "offset1=0x%04"PRIx64" offset2=0x%04"PRIx64"\n", offset1, offset2);
331  pos += 8;
332  break;
333 
334  case 0x83:
335  /* HD set palette */
336  if ((buf_size - pos) < 768)
337  goto fail;
338  yuv_palette = buf + pos;
339  pos += 768;
340  break;
341  case 0x84:
342  /* HD set contrast (alpha) */
343  if ((buf_size - pos) < 256)
344  goto fail;
345  for (i = 0; i < 256; i++)
346  alpha[i] = 0xFF - buf[pos+i];
347  pos += 256;
348  break;
349 
350  case 0xff:
351  goto the_end;
352  default:
353  ff_dlog(NULL, "unrecognised subpicture command 0x%x\n", cmd);
354  goto the_end;
355  }
356  }
357  the_end:
358  if (offset1 >= buf_size || offset2 >= buf_size)
359  goto fail;
360 
361  if (offset1 >= 0 && offset2 >= 0) {
362  int w, h;
363  uint8_t *bitmap;
364 
365  /* decode the bitmap */
366  w = x2 - x1 + 1;
367  if (w < 0)
368  w = 0;
369  h = y2 - y1 + 1;
370  if (h < 0)
371  h = 0;
372  if (w > 0 && h > 1) {
373  reset_rects(sub_header);
374  memset(ctx->used_color, 0, sizeof(ctx->used_color));
375  sub_header->rects = av_mallocz(sizeof(*sub_header->rects));
376  if (!sub_header->rects)
377  goto fail;
378  sub_header->rects[0] = av_mallocz(sizeof(AVSubtitleRect));
379  if (!sub_header->rects[0])
380  goto fail;
381  sub_header->num_rects = 1;
382  bitmap = sub_header->rects[0]->data[0] = av_malloc(w * h);
383  if (!bitmap)
384  goto fail;
385  if (decode_rle(bitmap, w * 2, w, (h + 1) / 2, ctx->used_color,
386  buf, offset1, buf_size, is_8bit) < 0)
387  goto fail;
388  if (decode_rle(bitmap + w, w * 2, w, h / 2, ctx->used_color,
389  buf, offset2, buf_size, is_8bit) < 0)
390  goto fail;
391  sub_header->rects[0]->data[1] = av_mallocz(AVPALETTE_SIZE);
392  if (!sub_header->rects[0]->data[1])
393  goto fail;
394  if (is_8bit) {
395  if (!yuv_palette)
396  goto fail;
397  sub_header->rects[0]->nb_colors = 256;
398  yuv_a_to_rgba(yuv_palette, alpha,
399  (uint32_t *)sub_header->rects[0]->data[1],
400  256);
401  } else {
402  sub_header->rects[0]->nb_colors = 4;
403  guess_palette(ctx, (uint32_t*)sub_header->rects[0]->data[1],
404  0xffff00);
405  }
406  sub_header->rects[0]->x = x1;
407  sub_header->rects[0]->y = y1;
408  sub_header->rects[0]->w = w;
409  sub_header->rects[0]->h = h;
410  sub_header->rects[0]->type = SUBTITLE_BITMAP;
411  sub_header->rects[0]->linesize[0] = w;
412  sub_header->rects[0]->flags = is_menu ? AV_SUBTITLE_FLAG_FORCED : 0;
413 
414 #if FF_API_AVPICTURE
416  for (i = 0; i < 4; i++) {
417  sub_header->rects[0]->pict.data[i] = sub_header->rects[0]->data[i];
418  sub_header->rects[0]->pict.linesize[i] = sub_header->rects[0]->linesize[i];
419  }
421 #endif
422  }
423  }
424  if (next_cmd_pos < cmd_pos) {
425  av_log(ctx, AV_LOG_ERROR, "Invalid command offset\n");
426  break;
427  }
428  if (next_cmd_pos == cmd_pos)
429  break;
430  cmd_pos = next_cmd_pos;
431  }
432  if (sub_header->num_rects > 0)
433  return is_menu;
434  fail:
435  reset_rects(sub_header);
436  return -1;
437 }
438 
439 static int is_transp(const uint8_t *buf, int pitch, int n,
440  const uint8_t *transp_color)
441 {
442  int i;
443  for(i = 0; i < n; i++) {
444  if (!transp_color[*buf])
445  return 0;
446  buf += pitch;
447  }
448  return 1;
449 }
450 
451 /* return 0 if empty rectangle, 1 if non empty */
453 {
454  uint8_t transp_color[256] = { 0 };
455  int y1, y2, x1, x2, y, w, h, i;
456  uint8_t *bitmap;
457  int transparent = 1;
458 
459  if (s->num_rects == 0 || !s->rects || s->rects[0]->w <= 0 || s->rects[0]->h <= 0)
460  return 0;
461 
462  for(i = 0; i < s->rects[0]->nb_colors; i++) {
463  if ((((uint32_t *)s->rects[0]->data[1])[i] >> 24) == 0) {
464  transp_color[i] = 1;
465  } else if (ctx->used_color[i])
466  transparent = 0;
467  }
468  if (transparent)
469  return 0;
470  y1 = 0;
471  while (y1 < s->rects[0]->h && is_transp(s->rects[0]->data[0] + y1 * s->rects[0]->linesize[0],
472  1, s->rects[0]->w, transp_color))
473  y1++;
474  if (y1 == s->rects[0]->h) {
475  av_freep(&s->rects[0]->data[0]);
476  s->rects[0]->w = s->rects[0]->h = 0;
477  return 0;
478  }
479 
480  y2 = s->rects[0]->h - 1;
481  while (y2 > 0 && is_transp(s->rects[0]->data[0] + y2 * s->rects[0]->linesize[0], 1,
482  s->rects[0]->w, transp_color))
483  y2--;
484  x1 = 0;
485  while (x1 < (s->rects[0]->w - 1) && is_transp(s->rects[0]->data[0] + x1, s->rects[0]->linesize[0],
486  s->rects[0]->h, transp_color))
487  x1++;
488  x2 = s->rects[0]->w - 1;
489  while (x2 > 0 && is_transp(s->rects[0]->data[0] + x2, s->rects[0]->linesize[0], s->rects[0]->h,
490  transp_color))
491  x2--;
492  w = x2 - x1 + 1;
493  h = y2 - y1 + 1;
494  bitmap = av_malloc(w * h);
495  if (!bitmap)
496  return 1;
497  for(y = 0; y < h; y++) {
498  memcpy(bitmap + w * y, s->rects[0]->data[0] + x1 + (y1 + y) * s->rects[0]->linesize[0], w);
499  }
500  av_freep(&s->rects[0]->data[0]);
501  s->rects[0]->data[0] = bitmap;
502  s->rects[0]->linesize[0] = w;
503  s->rects[0]->w = w;
504  s->rects[0]->h = h;
505  s->rects[0]->x += x1;
506  s->rects[0]->y += y1;
507 
508 #if FF_API_AVPICTURE
510  for (i = 0; i < 4; i++) {
511  s->rects[0]->pict.data[i] = s->rects[0]->data[i];
512  s->rects[0]->pict.linesize[i] = s->rects[0]->linesize[i];
513  }
515 #endif
516 
517  return 1;
518 }
519 
520 #ifdef DEBUG
521 #define ALPHA_MIX(A,BACK,FORE) (((255-(A)) * (BACK) + (A) * (FORE)) / 255)
522 static void ppm_save(const char *filename, uint8_t *bitmap, int w, int h,
523  uint32_t *rgba_palette)
524 {
525  int x, y, alpha;
526  uint32_t v;
527  int back[3] = {0, 255, 0}; /* green background */
528  FILE *f;
529 
530  f = fopen(filename, "w");
531  if (!f) {
532  perror(filename);
533  return;
534  }
535  fprintf(f, "P6\n"
536  "%d %d\n"
537  "%d\n",
538  w, h, 255);
539  for(y = 0; y < h; y++) {
540  for(x = 0; x < w; x++) {
541  v = rgba_palette[bitmap[y * w + x]];
542  alpha = v >> 24;
543  putc(ALPHA_MIX(alpha, back[0], (v >> 16) & 0xff), f);
544  putc(ALPHA_MIX(alpha, back[1], (v >> 8) & 0xff), f);
545  putc(ALPHA_MIX(alpha, back[2], (v >> 0) & 0xff), f);
546  }
547  }
548  fclose(f);
549 }
550 #endif
551 
553  const uint8_t *buf, int buf_size)
554 {
555  DVDSubContext *ctx = avctx->priv_data;
556 
557  av_assert0(buf_size >= 0 && ctx->buf_size <= sizeof(ctx->buf));
558  if (buf_size >= sizeof(ctx->buf) - ctx->buf_size) {
559  av_log(avctx, AV_LOG_WARNING, "Attempt to reconstruct "
560  "too large SPU packets aborted.\n");
561  ctx->buf_size = 0;
562  return AVERROR_INVALIDDATA;
563  }
564  memcpy(ctx->buf + ctx->buf_size, buf, buf_size);
565  ctx->buf_size += buf_size;
566  return 0;
567 }
568 
569 static int dvdsub_decode(AVCodecContext *avctx,
570  void *data, int *data_size,
571  AVPacket *avpkt)
572 {
573  DVDSubContext *ctx = avctx->priv_data;
574  const uint8_t *buf = avpkt->data;
575  int buf_size = avpkt->size;
576  AVSubtitle *sub = data;
577  int appended = 0;
578  int is_menu;
579 
580  if (ctx->buf_size) {
581  int ret = append_to_cached_buf(avctx, buf, buf_size);
582  if (ret < 0) {
583  *data_size = 0;
584  return ret;
585  }
586  buf = ctx->buf;
587  buf_size = ctx->buf_size;
588  appended = 1;
589  }
590 
591  is_menu = decode_dvd_subtitles(ctx, sub, buf, buf_size);
592  if (is_menu == AVERROR(EAGAIN)) {
593  *data_size = 0;
594  return appended ? 0 : append_to_cached_buf(avctx, buf, buf_size);
595  }
596 
597  if (is_menu < 0) {
598  no_subtitle:
599  reset_rects(sub);
600  *data_size = 0;
601 
602  return buf_size;
603  }
604  if (!is_menu && find_smallest_bounding_rectangle(ctx, sub) == 0)
605  goto no_subtitle;
606 
607  if (ctx->forced_subs_only && !(sub->rects[0]->flags & AV_SUBTITLE_FLAG_FORCED))
608  goto no_subtitle;
609 
610 #if defined(DEBUG)
611  {
612  char ppm_name[32];
613 
614  snprintf(ppm_name, sizeof(ppm_name), "/tmp/%05d.ppm", ctx->sub_id++);
615  ff_dlog(NULL, "start=%d ms end =%d ms\n",
616  sub->start_display_time,
617  sub->end_display_time);
618  ppm_save(ppm_name, sub->rects[0]->data[0],
619  sub->rects[0]->w, sub->rects[0]->h, (uint32_t*) sub->rects[0]->data[1]);
620  }
621 #endif
622 
623  ctx->buf_size = 0;
624  *data_size = 1;
625  return buf_size;
626 }
627 
628 static void parse_palette(DVDSubContext *ctx, char *p)
629 {
630  int i;
631 
632  ctx->has_palette = 1;
633  for(i=0;i<16;i++) {
634  ctx->palette[i] = strtoul(p, &p, 16);
635  while(*p == ',' || av_isspace(*p))
636  p++;
637  }
638 }
639 
640 static int parse_ifo_palette(DVDSubContext *ctx, char *p)
641 {
642  FILE *ifo;
643  char ifostr[12];
644  uint32_t sp_pgci, pgci, off_pgc, pgc;
645  uint8_t r, g, b, yuv[65], *buf;
646  int i, y, cb, cr, r_add, g_add, b_add;
647  int ret = 0;
648  const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
649 
650  ctx->has_palette = 0;
651  if ((ifo = fopen(p, "r")) == NULL) {
652  av_log(ctx, AV_LOG_WARNING, "Unable to open IFO file \"%s\": %s\n", p, av_err2str(AVERROR(errno)));
653  return AVERROR_EOF;
654  }
655  if (fread(ifostr, 12, 1, ifo) != 1 || memcmp(ifostr, "DVDVIDEO-VTS", 12)) {
656  av_log(ctx, AV_LOG_WARNING, "\"%s\" is not a proper IFO file\n", p);
657  ret = AVERROR_INVALIDDATA;
658  goto end;
659  }
660  if (fseek(ifo, 0xCC, SEEK_SET) == -1) {
661  ret = AVERROR(errno);
662  goto end;
663  }
664  if (fread(&sp_pgci, 4, 1, ifo) == 1) {
665  pgci = av_be2ne32(sp_pgci) * 2048;
666  if (fseek(ifo, pgci + 0x0C, SEEK_SET) == -1) {
667  ret = AVERROR(errno);
668  goto end;
669  }
670  if (fread(&off_pgc, 4, 1, ifo) == 1) {
671  pgc = pgci + av_be2ne32(off_pgc);
672  if (fseek(ifo, pgc + 0xA4, SEEK_SET) == -1) {
673  ret = AVERROR(errno);
674  goto end;
675  }
676  if (fread(yuv, 64, 1, ifo) == 1) {
677  buf = yuv;
678  for(i=0; i<16; i++) {
679  y = *++buf;
680  cr = *++buf;
681  cb = *++buf;
682  YUV_TO_RGB1_CCIR(cb, cr);
683  YUV_TO_RGB2_CCIR(r, g, b, y);
684  ctx->palette[i] = (r << 16) + (g << 8) + b;
685  buf++;
686  }
687  ctx->has_palette = 1;
688  }
689  }
690  }
691  if (ctx->has_palette == 0) {
692  av_log(ctx, AV_LOG_WARNING, "Failed to read palette from IFO file \"%s\"\n", p);
693  ret = AVERROR_INVALIDDATA;
694  }
695 end:
696  fclose(ifo);
697  return ret;
698 }
699 
701 {
703  char *dataorig, *data;
704  int ret = 1;
705 
706  if (!avctx->extradata || !avctx->extradata_size)
707  return 1;
708 
709  dataorig = data = av_malloc(avctx->extradata_size+1);
710  if (!data)
711  return AVERROR(ENOMEM);
712  memcpy(data, avctx->extradata, avctx->extradata_size);
713  data[avctx->extradata_size] = '\0';
714 
715  for(;;) {
716  int pos = strcspn(data, "\n\r");
717  if (pos==0 && *data==0)
718  break;
719 
720  if (strncmp("palette:", data, 8) == 0) {
721  parse_palette(ctx, data + 8);
722  } else if (strncmp("size:", data, 5) == 0) {
723  int w, h;
724  if (sscanf(data + 5, "%dx%d", &w, &h) == 2) {
725  ret = ff_set_dimensions(avctx, w, h);
726  if (ret < 0)
727  goto fail;
728  }
729  }
730 
731  data += pos;
732  data += strspn(data, "\n\r");
733  }
734 
735 fail:
736  av_free(dataorig);
737  return ret;
738 }
739 
741 {
742  DVDSubContext *ctx = avctx->priv_data;
743  int ret;
744 
745  if ((ret = dvdsub_parse_extradata(avctx)) < 0)
746  return ret;
747 
748  if (ctx->ifo_str)
749  parse_ifo_palette(ctx, ctx->ifo_str);
750  if (ctx->palette_str)
751  parse_palette(ctx, ctx->palette_str);
752  if (ctx->has_palette) {
753  int i;
754  av_log(avctx, AV_LOG_DEBUG, "palette:");
755  for(i=0;i<16;i++)
756  av_log(avctx, AV_LOG_DEBUG, " 0x%06"PRIx32, ctx->palette[i]);
757  av_log(avctx, AV_LOG_DEBUG, "\n");
758  }
759 
760  return 1;
761 }
762 
763 static void dvdsub_flush(AVCodecContext *avctx)
764 {
765  DVDSubContext *ctx = avctx->priv_data;
766  ctx->buf_size = 0;
767 }
768 
770 {
771  dvdsub_flush(avctx);
772  return 0;
773 }
774 
775 #define OFFSET(field) offsetof(DVDSubContext, field)
776 #define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
777 static const AVOption options[] = {
778  { "palette", "set the global palette", OFFSET(palette_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SD },
779  { "ifo_palette", "obtain the global palette from .IFO file", OFFSET(ifo_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SD },
780  { "forced_subs_only", "Only show forced subtitles", OFFSET(forced_subs_only), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, SD},
781  { NULL }
782 };
783 static const AVClass dvdsub_class = {
784  .class_name = "dvdsubdec",
785  .item_name = av_default_item_name,
786  .option = options,
787  .version = LIBAVUTIL_VERSION_INT,
788 };
789 
791  .name = "dvdsub",
792  .long_name = NULL_IF_CONFIG_SMALL("DVD subtitles"),
793  .type = AVMEDIA_TYPE_SUBTITLE,
795  .priv_data_size = sizeof(DVDSubContext),
796  .init = dvdsub_init,
798  .flush = dvdsub_flush,
799  .close = dvdsub_close,
800  .priv_class = &dvdsub_class,
801 };
uint8_t colormap[4]
Definition: dvdsubdec.c:40
#define NULL
Definition: coverity.c:32
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static void dvdsub_flush(AVCodecContext *avctx)
Definition: dvdsubdec.c:763
int x
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:3859
AVOption.
Definition: opt.h:246
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
static void flush(AVCodecContext *avctx)
misc image utilities
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:381
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
uint8_t alpha[256]
Definition: dvdsubdec.c:41
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:104
const char * g
Definition: vf_curves.c:115
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int nb_colors
number of colors in pict, undefined when pict is not set
Definition: avcodec.h:3863
int size
Definition: avcodec.h:1453
const char * b
Definition: vf_curves.c:116
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
static av_const int av_isspace(int c)
Locale-independent conversion of ASCII isspace.
Definition: avstring.h:222
#define MAX_NEG_CROP
Definition: mathops.h:31
unsigned num_rects
Definition: avcodec.h:3897
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
Definition: bytestream.h:87
#define av_be2ne32(x)
Definition: bswap.h:93
uint32_t palette[16]
Definition: dvdsubdec.c:36
AVCodec.
Definition: avcodec.h:3441
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
static av_cold int dvdsub_close(AVCodecContext *avctx)
Definition: dvdsubdec.c:769
attribute_deprecated AVPicture pict
Definition: avcodec.h:3870
Macro definitions for various function/variable attributes.
AVSubtitleRect ** rects
Definition: avcodec.h:3898
int w
width of pict, undefined when pict is not set
Definition: avcodec.h:3861
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
static double cb(void *priv, double x, double y)
Definition: vf_geq.c:112
uint8_t
#define av_cold
Definition: attributes.h:82
#define av_malloc(s)
AVOptions.
static const uint32_t color[16+AV_CLASS_CATEGORY_NB]
Definition: log.c:92
#define f(width, name)
Definition: cbs_vp9.c:255
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
attribute_deprecated int linesize[AV_NUM_DATA_POINTERS]
number of bytes per line
Definition: avcodec.h:3830
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1641
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:87
char * ifo_str
Definition: dvdsubdec.c:38
static void reset_rects(AVSubtitle *sub_header)
Definition: dvdsubdec.c:204
uint8_t * data
Definition: avcodec.h:1452
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:219
#define ff_dlog(a,...)
#define READ_OFFSET(a)
Definition: dvdsubdec.c:219
#define AVERROR_EOF
End of file.
Definition: error.h:55
bitstream reader API header.
ptrdiff_t size
Definition: opengl_enc.c:101
int h
height of pict, undefined when pict is not set
Definition: avcodec.h:3862
static av_cold int dvdsub_init(AVCodecContext *avctx)
Definition: dvdsubdec.c:740
#define av_log(a,...)
#define cm
Definition: dvbsubdec.c:37
#define SD
Definition: dvdsubdec.c:776
#define U(x)
Definition: vp56_arith.h:37
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
Various defines for YUV<->RGB conversion.
int y
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:3860
#define AVERROR(e)
Definition: error.h:43
uint8_t used_color[256]
Definition: dvdsubdec.c:45
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
const char * r
Definition: vf_curves.c:114
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
static int find_smallest_bounding_rectangle(DVDSubContext *ctx, AVSubtitle *s)
Definition: dvdsubdec.c:452
const char * name
Name of the codec implementation.
Definition: avcodec.h:3448
static int append_to_cached_buf(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: dvdsubdec.c:552
#define fail()
Definition: checkasm.h:117
#define OFFSET(field)
Definition: dvdsubdec.c:775
uint32_t end_display_time
Definition: avcodec.h:3896
uint8_t buf[0x10000]
Definition: dvdsubdec.c:42
static int decode_run_8bit(GetBitContext *gb, int *color)
Definition: dvdsubdec.c:82
A bitmap, pict will be set.
Definition: avcodec.h:3841
#define AV_SUBTITLE_FLAG_FORCED
Definition: avcodec.h:3856
int linesize[4]
Definition: avcodec.h:3877
static const AVClass dvdsub_class
Definition: dvdsubdec.c:783
#define FFMIN(a, b)
Definition: common.h:96
static int decode_rle(uint8_t *bitmap, int linesize, int w, int h, uint8_t used_color[256], const uint8_t *buf, int start, int buf_size, int is_8bit)
Definition: dvdsubdec.c:101
uint8_t w
Definition: llviddspenc.c:38
#define YUV_TO_RGB2_CCIR(r, g, b, y1)
Definition: colorspace.h:55
static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values)
Definition: dvdsubdec.c:51
#define av_err2str(errnum)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: error.h:119
AVFormatContext * ctx
Definition: movenc.c:48
static int parse_ifo_palette(DVDSubContext *ctx, char *p)
Definition: dvdsubdec.c:640
static int is_transp(const uint8_t *buf, int pitch, int n, const uint8_t *transp_color)
Definition: dvdsubdec.c:439
attribute_deprecated uint8_t * data[AV_NUM_DATA_POINTERS]
pointers to the image data planes
Definition: avcodec.h:3828
#define s(width, name)
Definition: cbs_vp9.c:257
int n
Definition: avisynth_c.h:684
int has_palette
Definition: dvdsubdec.c:39
uint8_t * data[4]
data+linesize for the bitmap of this subtitle.
Definition: avcodec.h:3876
AVCodec ff_dvdsub_decoder
Definition: dvdsubdec.c:790
#define YUV_TO_RGB1_CCIR(cb1, cr1)
Definition: colorspace.h:34
static void parse_palette(DVDSubContext *ctx, char *p)
Definition: dvdsubdec.c:628
Libavcodec external API header.
static const int16_t alpha[]
Definition: ilbcdata.h:55
main external API structure.
Definition: avcodec.h:1540
static const AVOption options[]
Definition: dvdsubdec.c:777
static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header, const uint8_t *buf, int buf_size)
Definition: dvdsubdec.c:221
void * buf
Definition: avisynth_c.h:690
int extradata_size
Definition: avcodec.h:1642
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:487
Describe the class of an AVClass context structure.
Definition: log.h:67
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:615
byte swapping routines
static int decode_run_2bit(GetBitContext *gb, int *color)
Definition: dvdsubdec.c:68
#define snprintf
Definition: snprintf.h:34
uint8_t level
Definition: svq3.c:207
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:84
common internal api header.
if(ret< 0)
Definition: vf_mcdeint.c:279
static int dvdsub_parse_extradata(AVCodecContext *avctx)
Definition: dvdsubdec.c:700
uint32_t start_display_time
Definition: avcodec.h:3895
static void guess_palette(DVDSubContext *ctx, uint32_t *rgba_palette, uint32_t subtitle_color)
Definition: dvdsubdec.c:147
#define ff_crop_tab
void * priv_data
Definition: avcodec.h:1567
#define av_free(p)
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:85
int len
static int dvdsub_decode(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
Definition: dvdsubdec.c:569
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:658
#define av_freep(p)
void INT64 start
Definition: avisynth_c.h:690
static double cr(void *priv, double x, double y)
Definition: vf_geq.c:113
enum AVSubtitleType type
Definition: avcodec.h:3879
This structure stores compressed data.
Definition: avcodec.h:1429
char * palette_str
Definition: dvdsubdec.c:37
int forced_subs_only
Definition: dvdsubdec.c:44