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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;
45 #ifdef DEBUG
46  int sub_id;
47 #endif
49 
50 static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values)
51 {
53  uint8_t r, g, b;
54  int i, y, cb, cr;
55  int r_add, g_add, b_add;
56 
57  for (i = num_values; i > 0; i--) {
58  y = *ycbcr++;
59  cr = *ycbcr++;
60  cb = *ycbcr++;
61  YUV_TO_RGB1_CCIR(cb, cr);
62  YUV_TO_RGB2_CCIR(r, g, b, y);
63  *rgba++ = (*alpha++ << 24) | (r << 16) | (g << 8) | b;
64  }
65 }
66 
67 static int decode_run_2bit(GetBitContext *gb, int *color)
68 {
69  unsigned int v, t;
70 
71  v = 0;
72  for (t = 1; v < t && t <= 0x40; t <<= 2)
73  v = (v << 4) | get_bits(gb, 4);
74  *color = v & 3;
75  if (v < 4) { /* Code for fill rest of line */
76  return INT_MAX;
77  }
78  return v >> 2;
79 }
80 
81 static int decode_run_8bit(GetBitContext *gb, int *color)
82 {
83  int len;
84  int has_run = get_bits1(gb);
85  if (get_bits1(gb))
86  *color = get_bits(gb, 8);
87  else
88  *color = get_bits(gb, 2);
89  if (has_run) {
90  if (get_bits1(gb)) {
91  len = get_bits(gb, 7);
92  if (len == 0)
93  len = INT_MAX;
94  else
95  len += 9;
96  } else
97  len = get_bits(gb, 3) + 2;
98  } else
99  len = 1;
100  return len;
101 }
102 
103 static int decode_rle(uint8_t *bitmap, int linesize, int w, int h,
104  const uint8_t *buf, int start, int buf_size, int is_8bit)
105 {
106  GetBitContext gb;
107  int bit_len;
108  int x, y, len, color;
109  uint8_t *d;
110 
111  if (start >= buf_size)
112  return -1;
113 
114  if (w <= 0 || h <= 0)
115  return -1;
116 
117  bit_len = (buf_size - start) * 8;
118  init_get_bits(&gb, buf + start, bit_len);
119 
120  x = 0;
121  y = 0;
122  d = bitmap;
123  for(;;) {
124  if (get_bits_count(&gb) > bit_len)
125  return -1;
126  if (is_8bit)
127  len = decode_run_8bit(&gb, &color);
128  else
129  len = decode_run_2bit(&gb, &color);
130  len = FFMIN(len, w - x);
131  memset(d + x, color, len);
132  x += len;
133  if (x >= w) {
134  y++;
135  if (y >= h)
136  break;
137  d += linesize;
138  x = 0;
139  /* byte align */
140  align_get_bits(&gb);
141  }
142  }
143  return 0;
144 }
145 
147  uint32_t *rgba_palette,
148  uint32_t subtitle_color)
149 {
150  static const uint8_t level_map[4][4] = {
151  // this configuration (full range, lowest to highest) in tests
152  // seemed most common, so assume this
153  {0xff},
154  {0x00, 0xff},
155  {0x00, 0x80, 0xff},
156  {0x00, 0x55, 0xaa, 0xff},
157  };
158  uint8_t color_used[16] = { 0 };
159  int nb_opaque_colors, i, level, j, r, g, b;
160  uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;
161 
162  if(ctx->has_palette) {
163  for(i = 0; i < 4; i++)
164  rgba_palette[i] = (ctx->palette[colormap[i]] & 0x00ffffff)
165  | ((alpha[i] * 17U) << 24);
166  return;
167  }
168 
169  for(i = 0; i < 4; i++)
170  rgba_palette[i] = 0;
171 
172  nb_opaque_colors = 0;
173  for(i = 0; i < 4; i++) {
174  if (alpha[i] != 0 && !color_used[colormap[i]]) {
175  color_used[colormap[i]] = 1;
176  nb_opaque_colors++;
177  }
178  }
179 
180  if (nb_opaque_colors == 0)
181  return;
182 
183  j = 0;
184  memset(color_used, 0, 16);
185  for(i = 0; i < 4; i++) {
186  if (alpha[i] != 0) {
187  if (!color_used[colormap[i]]) {
188  level = level_map[nb_opaque_colors][j];
189  r = (((subtitle_color >> 16) & 0xff) * level) >> 8;
190  g = (((subtitle_color >> 8) & 0xff) * level) >> 8;
191  b = (((subtitle_color >> 0) & 0xff) * level) >> 8;
192  rgba_palette[i] = b | (g << 8) | (r << 16) | ((alpha[i] * 17) << 24);
193  color_used[colormap[i]] = (i + 1);
194  j++;
195  } else {
196  rgba_palette[i] = (rgba_palette[color_used[colormap[i]] - 1] & 0x00ffffff) |
197  ((alpha[i] * 17) << 24);
198  }
199  }
200  }
201 }
202 
203 static void reset_rects(AVSubtitle *sub_header)
204 {
205  int i;
206 
207  if (sub_header->rects) {
208  for (i = 0; i < sub_header->num_rects; i++) {
209  av_freep(&sub_header->rects[i]->data[0]);
210  av_freep(&sub_header->rects[i]->data[1]);
211  av_freep(&sub_header->rects[i]);
212  }
213  av_freep(&sub_header->rects);
214  sub_header->num_rects = 0;
215  }
216 }
217 
218 #define READ_OFFSET(a) (big_offsets ? AV_RB32(a) : AV_RB16(a))
219 
221  const uint8_t *buf, int buf_size)
222 {
223  int cmd_pos, pos, cmd, x1, y1, x2, y2, next_cmd_pos;
224  int big_offsets, offset_size, is_8bit = 0;
225  const uint8_t *yuv_palette = NULL;
226  uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;
227  int date;
228  int i;
229  int is_menu = 0;
230  uint32_t size;
231  int64_t offset1, offset2;
232 
233  if (buf_size < 10)
234  return -1;
235 
236  if (AV_RB16(buf) == 0) { /* HD subpicture with 4-byte offsets */
237  big_offsets = 1;
238  offset_size = 4;
239  cmd_pos = 6;
240  } else {
241  big_offsets = 0;
242  offset_size = 2;
243  cmd_pos = 2;
244  }
245 
246  size = READ_OFFSET(buf + (big_offsets ? 2 : 0));
247  cmd_pos = READ_OFFSET(buf + cmd_pos);
248 
249  if (cmd_pos < 0 || cmd_pos > buf_size - 2 - offset_size) {
250  if (cmd_pos > size) {
251  av_log(ctx, AV_LOG_ERROR, "Discarding invalid packet\n");
252  return 0;
253  }
254  return AVERROR(EAGAIN);
255  }
256 
257  while (cmd_pos > 0 && cmd_pos < buf_size - 2 - offset_size) {
258  date = AV_RB16(buf + cmd_pos);
259  next_cmd_pos = READ_OFFSET(buf + cmd_pos + 2);
260  ff_dlog(NULL, "cmd_pos=0x%04x next=0x%04x date=%d\n",
261  cmd_pos, next_cmd_pos, date);
262  pos = cmd_pos + 2 + offset_size;
263  offset1 = -1;
264  offset2 = -1;
265  x1 = y1 = x2 = y2 = 0;
266  while (pos < buf_size) {
267  cmd = buf[pos++];
268  ff_dlog(NULL, "cmd=%02x\n", cmd);
269  switch(cmd) {
270  case 0x00:
271  /* menu subpicture */
272  is_menu = 1;
273  break;
274  case 0x01:
275  /* set start date */
276  sub_header->start_display_time = (date << 10) / 90;
277  break;
278  case 0x02:
279  /* set end date */
280  sub_header->end_display_time = (date << 10) / 90;
281  break;
282  case 0x03:
283  /* set colormap */
284  if ((buf_size - pos) < 2)
285  goto fail;
286  colormap[3] = buf[pos] >> 4;
287  colormap[2] = buf[pos] & 0x0f;
288  colormap[1] = buf[pos + 1] >> 4;
289  colormap[0] = buf[pos + 1] & 0x0f;
290  pos += 2;
291  break;
292  case 0x04:
293  /* set alpha */
294  if ((buf_size - pos) < 2)
295  goto fail;
296  alpha[3] = buf[pos] >> 4;
297  alpha[2] = buf[pos] & 0x0f;
298  alpha[1] = buf[pos + 1] >> 4;
299  alpha[0] = buf[pos + 1] & 0x0f;
300  pos += 2;
301  ff_dlog(NULL, "alpha=%x%x%x%x\n", alpha[0],alpha[1],alpha[2],alpha[3]);
302  break;
303  case 0x05:
304  case 0x85:
305  if ((buf_size - pos) < 6)
306  goto fail;
307  x1 = (buf[pos] << 4) | (buf[pos + 1] >> 4);
308  x2 = ((buf[pos + 1] & 0x0f) << 8) | buf[pos + 2];
309  y1 = (buf[pos + 3] << 4) | (buf[pos + 4] >> 4);
310  y2 = ((buf[pos + 4] & 0x0f) << 8) | buf[pos + 5];
311  if (cmd & 0x80)
312  is_8bit = 1;
313  ff_dlog(NULL, "x1=%d x2=%d y1=%d y2=%d\n", x1, x2, y1, y2);
314  pos += 6;
315  break;
316  case 0x06:
317  if ((buf_size - pos) < 4)
318  goto fail;
319  offset1 = AV_RB16(buf + pos);
320  offset2 = AV_RB16(buf + pos + 2);
321  ff_dlog(NULL, "offset1=0x%04"PRIx64" offset2=0x%04"PRIx64"\n", offset1, offset2);
322  pos += 4;
323  break;
324  case 0x86:
325  if ((buf_size - pos) < 8)
326  goto fail;
327  offset1 = AV_RB32(buf + pos);
328  offset2 = AV_RB32(buf + pos + 4);
329  ff_dlog(NULL, "offset1=0x%04"PRIx64" offset2=0x%04"PRIx64"\n", offset1, offset2);
330  pos += 8;
331  break;
332 
333  case 0x83:
334  /* HD set palette */
335  if ((buf_size - pos) < 768)
336  goto fail;
337  yuv_palette = buf + pos;
338  pos += 768;
339  break;
340  case 0x84:
341  /* HD set contrast (alpha) */
342  if ((buf_size - pos) < 256)
343  goto fail;
344  for (i = 0; i < 256; i++)
345  alpha[i] = 0xFF - buf[pos+i];
346  pos += 256;
347  break;
348 
349  case 0xff:
350  goto the_end;
351  default:
352  ff_dlog(NULL, "unrecognised subpicture command 0x%x\n", cmd);
353  goto the_end;
354  }
355  }
356  the_end:
357  if (offset1 >= buf_size || offset2 >= buf_size)
358  goto fail;
359 
360  if (offset1 >= 0 && offset2 >= 0) {
361  int w, h;
362  uint8_t *bitmap;
363 
364  /* decode the bitmap */
365  w = x2 - x1 + 1;
366  if (w < 0)
367  w = 0;
368  h = y2 - y1 + 1;
369  if (h < 0)
370  h = 0;
371  if (w > 0 && h > 0) {
372  reset_rects(sub_header);
373 
374  sub_header->rects = av_mallocz(sizeof(*sub_header->rects));
375  if (!sub_header->rects)
376  goto fail;
377  sub_header->rects[0] = av_mallocz(sizeof(AVSubtitleRect));
378  if (!sub_header->rects[0])
379  goto fail;
380  sub_header->num_rects = 1;
381  bitmap = sub_header->rects[0]->data[0] = av_malloc(w * h);
382  if (!bitmap)
383  goto fail;
384  if (decode_rle(bitmap, w * 2, w, (h + 1) / 2,
385  buf, offset1, buf_size, is_8bit) < 0)
386  goto fail;
387  if (decode_rle(bitmap + w, w * 2, w, h / 2,
388  buf, offset2, buf_size, is_8bit) < 0)
389  goto fail;
390  sub_header->rects[0]->data[1] = av_mallocz(AVPALETTE_SIZE);
391  if (!sub_header->rects[0]->data[1])
392  goto fail;
393  if (is_8bit) {
394  if (!yuv_palette)
395  goto fail;
396  sub_header->rects[0]->nb_colors = 256;
397  yuv_a_to_rgba(yuv_palette, alpha,
398  (uint32_t *)sub_header->rects[0]->data[1],
399  256);
400  } else {
401  sub_header->rects[0]->nb_colors = 4;
402  guess_palette(ctx, (uint32_t*)sub_header->rects[0]->data[1],
403  0xffff00);
404  }
405  sub_header->rects[0]->x = x1;
406  sub_header->rects[0]->y = y1;
407  sub_header->rects[0]->w = w;
408  sub_header->rects[0]->h = h;
409  sub_header->rects[0]->type = SUBTITLE_BITMAP;
410  sub_header->rects[0]->linesize[0] = w;
411  sub_header->rects[0]->flags = is_menu ? AV_SUBTITLE_FLAG_FORCED : 0;
412 
413 #if FF_API_AVPICTURE
415  for (i = 0; i < 4; i++) {
416  sub_header->rects[0]->pict.data[i] = sub_header->rects[0]->data[i];
417  sub_header->rects[0]->pict.linesize[i] = sub_header->rects[0]->linesize[i];
418  }
420 #endif
421  }
422  }
423  if (next_cmd_pos < cmd_pos) {
424  av_log(ctx, AV_LOG_ERROR, "Invalid command offset\n");
425  break;
426  }
427  if (next_cmd_pos == cmd_pos)
428  break;
429  cmd_pos = next_cmd_pos;
430  }
431  if (sub_header->num_rects > 0)
432  return is_menu;
433  fail:
434  reset_rects(sub_header);
435  return -1;
436 }
437 
438 static int is_transp(const uint8_t *buf, int pitch, int n,
439  const uint8_t *transp_color)
440 {
441  int i;
442  for(i = 0; i < n; i++) {
443  if (!transp_color[*buf])
444  return 0;
445  buf += pitch;
446  }
447  return 1;
448 }
449 
450 /* return 0 if empty rectangle, 1 if non empty */
452 {
453  uint8_t transp_color[256] = { 0 };
454  int y1, y2, x1, x2, y, w, h, i;
455  uint8_t *bitmap;
456 
457  if (s->num_rects == 0 || !s->rects || s->rects[0]->w <= 0 || s->rects[0]->h <= 0)
458  return 0;
459 
460  for(i = 0; i < s->rects[0]->nb_colors; i++) {
461  if ((((uint32_t *)s->rects[0]->data[1])[i] >> 24) == 0)
462  transp_color[i] = 1;
463  }
464  y1 = 0;
465  while (y1 < s->rects[0]->h && is_transp(s->rects[0]->data[0] + y1 * s->rects[0]->linesize[0],
466  1, s->rects[0]->w, transp_color))
467  y1++;
468  if (y1 == s->rects[0]->h) {
469  av_freep(&s->rects[0]->data[0]);
470  s->rects[0]->w = s->rects[0]->h = 0;
471  return 0;
472  }
473 
474  y2 = s->rects[0]->h - 1;
475  while (y2 > 0 && is_transp(s->rects[0]->data[0] + y2 * s->rects[0]->linesize[0], 1,
476  s->rects[0]->w, transp_color))
477  y2--;
478  x1 = 0;
479  while (x1 < (s->rects[0]->w - 1) && is_transp(s->rects[0]->data[0] + x1, s->rects[0]->linesize[0],
480  s->rects[0]->h, transp_color))
481  x1++;
482  x2 = s->rects[0]->w - 1;
483  while (x2 > 0 && is_transp(s->rects[0]->data[0] + x2, s->rects[0]->linesize[0], s->rects[0]->h,
484  transp_color))
485  x2--;
486  w = x2 - x1 + 1;
487  h = y2 - y1 + 1;
488  bitmap = av_malloc(w * h);
489  if (!bitmap)
490  return 1;
491  for(y = 0; y < h; y++) {
492  memcpy(bitmap + w * y, s->rects[0]->data[0] + x1 + (y1 + y) * s->rects[0]->linesize[0], w);
493  }
494  av_freep(&s->rects[0]->data[0]);
495  s->rects[0]->data[0] = bitmap;
496  s->rects[0]->linesize[0] = w;
497  s->rects[0]->w = w;
498  s->rects[0]->h = h;
499  s->rects[0]->x += x1;
500  s->rects[0]->y += y1;
501 
502 #if FF_API_AVPICTURE
504  for (i = 0; i < 4; i++) {
505  s->rects[0]->pict.data[i] = s->rects[0]->data[i];
506  s->rects[0]->pict.linesize[i] = s->rects[0]->linesize[i];
507  }
509 #endif
510 
511  return 1;
512 }
513 
514 #ifdef DEBUG
515 #define ALPHA_MIX(A,BACK,FORE) (((255-(A)) * (BACK) + (A) * (FORE)) / 255)
516 static void ppm_save(const char *filename, uint8_t *bitmap, int w, int h,
517  uint32_t *rgba_palette)
518 {
519  int x, y, alpha;
520  uint32_t v;
521  int back[3] = {0, 255, 0}; /* green background */
522  FILE *f;
523 
524  f = fopen(filename, "w");
525  if (!f) {
526  perror(filename);
527  return;
528  }
529  fprintf(f, "P6\n"
530  "%d %d\n"
531  "%d\n",
532  w, h, 255);
533  for(y = 0; y < h; y++) {
534  for(x = 0; x < w; x++) {
535  v = rgba_palette[bitmap[y * w + x]];
536  alpha = v >> 24;
537  putc(ALPHA_MIX(alpha, back[0], (v >> 16) & 0xff), f);
538  putc(ALPHA_MIX(alpha, back[1], (v >> 8) & 0xff), f);
539  putc(ALPHA_MIX(alpha, back[2], (v >> 0) & 0xff), f);
540  }
541  }
542  fclose(f);
543 }
544 #endif
545 
547  const uint8_t *buf, int buf_size)
548 {
549  DVDSubContext *ctx = avctx->priv_data;
550 
551  if (ctx->buf_size >= sizeof(ctx->buf) - buf_size) {
552  av_log(avctx, AV_LOG_WARNING, "Attempt to reconstruct "
553  "too large SPU packets aborted.\n");
554  ctx->buf_size = 0;
555  return AVERROR_INVALIDDATA;
556  }
557  memcpy(ctx->buf + ctx->buf_size, buf, buf_size);
558  ctx->buf_size += buf_size;
559  return 0;
560 }
561 
562 static int dvdsub_decode(AVCodecContext *avctx,
563  void *data, int *data_size,
564  AVPacket *avpkt)
565 {
566  DVDSubContext *ctx = avctx->priv_data;
567  const uint8_t *buf = avpkt->data;
568  int buf_size = avpkt->size;
569  AVSubtitle *sub = data;
570  int appended = 0;
571  int is_menu;
572 
573  if (ctx->buf_size) {
574  int ret = append_to_cached_buf(avctx, buf, buf_size);
575  if (ret < 0) {
576  *data_size = 0;
577  return ret;
578  }
579  buf = ctx->buf;
580  buf_size = ctx->buf_size;
581  appended = 1;
582  }
583 
584  is_menu = decode_dvd_subtitles(ctx, sub, buf, buf_size);
585  if (is_menu == AVERROR(EAGAIN)) {
586  *data_size = 0;
587  return appended ? 0 : append_to_cached_buf(avctx, buf, buf_size);
588  }
589 
590  if (is_menu < 0) {
591  no_subtitle:
592  reset_rects(sub);
593  *data_size = 0;
594 
595  return buf_size;
596  }
597  if (!is_menu && find_smallest_bounding_rectangle(sub) == 0)
598  goto no_subtitle;
599 
600  if (ctx->forced_subs_only && !(sub->rects[0]->flags & AV_SUBTITLE_FLAG_FORCED))
601  goto no_subtitle;
602 
603 #if defined(DEBUG)
604  {
605  char ppm_name[32];
606 
607  snprintf(ppm_name, sizeof(ppm_name), "/tmp/%05d.ppm", ctx->sub_id++);
608  ff_dlog(NULL, "start=%d ms end =%d ms\n",
609  sub->start_display_time,
610  sub->end_display_time);
611  ppm_save(ppm_name, sub->rects[0]->data[0],
612  sub->rects[0]->w, sub->rects[0]->h, (uint32_t*) sub->rects[0]->data[1]);
613  }
614 #endif
615 
616  ctx->buf_size = 0;
617  *data_size = 1;
618  return buf_size;
619 }
620 
621 static void parse_palette(DVDSubContext *ctx, char *p)
622 {
623  int i;
624 
625  ctx->has_palette = 1;
626  for(i=0;i<16;i++) {
627  ctx->palette[i] = strtoul(p, &p, 16);
628  while(*p == ',' || av_isspace(*p))
629  p++;
630  }
631 }
632 
633 static int parse_ifo_palette(DVDSubContext *ctx, char *p)
634 {
635  FILE *ifo;
636  char ifostr[12];
637  uint32_t sp_pgci, pgci, off_pgc, pgc;
638  uint8_t r, g, b, yuv[65], *buf;
639  int i, y, cb, cr, r_add, g_add, b_add;
640  int ret = 0;
641  const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
642 
643  ctx->has_palette = 0;
644  if ((ifo = fopen(p, "r")) == NULL) {
645  av_log(ctx, AV_LOG_WARNING, "Unable to open IFO file \"%s\": %s\n", p, av_err2str(AVERROR(errno)));
646  return AVERROR_EOF;
647  }
648  if (fread(ifostr, 12, 1, ifo) != 1 || memcmp(ifostr, "DVDVIDEO-VTS", 12)) {
649  av_log(ctx, AV_LOG_WARNING, "\"%s\" is not a proper IFO file\n", p);
650  ret = AVERROR_INVALIDDATA;
651  goto end;
652  }
653  if (fseek(ifo, 0xCC, SEEK_SET) == -1) {
654  ret = AVERROR(errno);
655  goto end;
656  }
657  if (fread(&sp_pgci, 4, 1, ifo) == 1) {
658  pgci = av_be2ne32(sp_pgci) * 2048;
659  if (fseek(ifo, pgci + 0x0C, SEEK_SET) == -1) {
660  ret = AVERROR(errno);
661  goto end;
662  }
663  if (fread(&off_pgc, 4, 1, ifo) == 1) {
664  pgc = pgci + av_be2ne32(off_pgc);
665  if (fseek(ifo, pgc + 0xA4, SEEK_SET) == -1) {
666  ret = AVERROR(errno);
667  goto end;
668  }
669  if (fread(yuv, 64, 1, ifo) == 1) {
670  buf = yuv;
671  for(i=0; i<16; i++) {
672  y = *++buf;
673  cr = *++buf;
674  cb = *++buf;
675  YUV_TO_RGB1_CCIR(cb, cr);
676  YUV_TO_RGB2_CCIR(r, g, b, y);
677  ctx->palette[i] = (r << 16) + (g << 8) + b;
678  buf++;
679  }
680  ctx->has_palette = 1;
681  }
682  }
683  }
684  if (ctx->has_palette == 0) {
685  av_log(ctx, AV_LOG_WARNING, "Failed to read palette from IFO file \"%s\"\n", p);
686  ret = AVERROR_INVALIDDATA;
687  }
688 end:
689  fclose(ifo);
690  return ret;
691 }
692 
694 {
696  char *dataorig, *data;
697  int ret = 1;
698 
699  if (!avctx->extradata || !avctx->extradata_size)
700  return 1;
701 
702  dataorig = data = av_malloc(avctx->extradata_size+1);
703  if (!data)
704  return AVERROR(ENOMEM);
705  memcpy(data, avctx->extradata, avctx->extradata_size);
706  data[avctx->extradata_size] = '\0';
707 
708  for(;;) {
709  int pos = strcspn(data, "\n\r");
710  if (pos==0 && *data==0)
711  break;
712 
713  if (strncmp("palette:", data, 8) == 0) {
714  parse_palette(ctx, data + 8);
715  } else if (strncmp("size:", data, 5) == 0) {
716  int w, h;
717  if (sscanf(data + 5, "%dx%d", &w, &h) == 2) {
718  ret = ff_set_dimensions(avctx, w, h);
719  if (ret < 0)
720  goto fail;
721  }
722  }
723 
724  data += pos;
725  data += strspn(data, "\n\r");
726  }
727 
728 fail:
729  av_free(dataorig);
730  return ret;
731 }
732 
734 {
735  DVDSubContext *ctx = avctx->priv_data;
736  int ret;
737 
738  if ((ret = dvdsub_parse_extradata(avctx)) < 0)
739  return ret;
740 
741  if (ctx->ifo_str)
742  parse_ifo_palette(ctx, ctx->ifo_str);
743  if (ctx->palette_str)
744  parse_palette(ctx, ctx->palette_str);
745  if (ctx->has_palette) {
746  int i;
747  av_log(avctx, AV_LOG_DEBUG, "palette:");
748  for(i=0;i<16;i++)
749  av_log(avctx, AV_LOG_DEBUG, " 0x%06x", ctx->palette[i]);
750  av_log(avctx, AV_LOG_DEBUG, "\n");
751  }
752 
753  return 1;
754 }
755 
756 static void dvdsub_flush(AVCodecContext *avctx)
757 {
758  DVDSubContext *ctx = avctx->priv_data;
759  ctx->buf_size = 0;
760 }
761 
763 {
764  dvdsub_flush(avctx);
765  return 0;
766 }
767 
768 #define OFFSET(field) offsetof(DVDSubContext, field)
769 #define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
770 static const AVOption options[] = {
771  { "palette", "set the global palette", OFFSET(palette_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SD },
772  { "ifo_palette", "obtain the global palette from .IFO file", OFFSET(ifo_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SD },
773  { "forced_subs_only", "Only show forced subtitles", OFFSET(forced_subs_only), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, SD},
774  { NULL }
775 };
776 static const AVClass dvdsub_class = {
777  .class_name = "dvdsubdec",
778  .item_name = av_default_item_name,
779  .option = options,
780  .version = LIBAVUTIL_VERSION_INT,
781 };
782 
784  .name = "dvdsub",
785  .long_name = NULL_IF_CONFIG_SMALL("DVD subtitles"),
786  .type = AVMEDIA_TYPE_SUBTITLE,
788  .priv_data_size = sizeof(DVDSubContext),
789  .init = dvdsub_init,
791  .flush = dvdsub_flush,
792  .close = dvdsub_close,
793  .priv_class = &dvdsub_class,
794 };
uint8_t colormap[4]
Definition: dvdsubdec.c:40
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:768
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static void dvdsub_flush(AVCodecContext *avctx)
Definition: dvdsubdec.c:756
int x
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:3895
AVOption.
Definition: opt.h:245
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:247
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
#define YUV_TO_RGB1_CCIR(cb1, cr1)
Definition: colorspace.h:34
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:210
const char * g
Definition: vf_curves.c:112
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:3899
int size
Definition: avcodec.h:1591
const char * b
Definition: vf_curves.c:113
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:30
Various defines for YUV<->RGB conversion.
unsigned num_rects
Definition: avcodec.h:3933
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:252
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:3573
static av_cold int dvdsub_close(AVCodecContext *avctx)
Definition: dvdsubdec.c:762
attribute_deprecated AVPicture pict
Definition: avcodec.h:3906
Macro definitions for various function/variable attributes.
AVSubtitleRect ** rects
Definition: avcodec.h:3934
int w
width of pict, undefined when pict is not set
Definition: avcodec.h:3897
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
static double cb(void *priv, double x, double y)
Definition: vf_geq.c:97
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:94
#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:3866
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1774
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:203
uint8_t * data
Definition: avcodec.h:1590
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:199
#define ff_dlog(a,...)
#define READ_OFFSET(a)
Definition: dvdsubdec.c:218
#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:3898
static av_cold int dvdsub_init(AVCodecContext *avctx)
Definition: dvdsubdec.c:733
#define av_log(a,...)
#define cm
Definition: dvbsubdec.c:36
#define SD
Definition: dvdsubdec.c:769
#define U(x)
Definition: vp56_arith.h:37
static double alpha(void *priv, double x, double y)
Definition: vf_geq.c:99
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int y
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:3896
av_default_item_name
#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:176
const char * r
Definition: vf_curves.c:111
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
const char * name
Name of the codec implementation.
Definition: avcodec.h:3580
static int append_to_cached_buf(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: dvdsubdec.c:546
#define fail()
Definition: checkasm.h:82
#define OFFSET(field)
Definition: dvdsubdec.c:768
uint32_t end_display_time
Definition: avcodec.h:3932
uint8_t buf[0x10000]
Definition: dvdsubdec.c:42
static int decode_run_8bit(GetBitContext *gb, int *color)
Definition: dvdsubdec.c:81
A bitmap, pict will be set.
Definition: avcodec.h:3877
#define AV_SUBTITLE_FLAG_FORCED
Definition: avcodec.h:3892
int linesize[4]
Definition: avcodec.h:3913
static const AVClass dvdsub_class
Definition: dvdsubdec.c:776
#define FFMIN(a, b)
Definition: common.h:96
static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values)
Definition: dvdsubdec.c:50
#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:633
static int is_transp(const uint8_t *buf, int pitch, int n, const uint8_t *transp_color)
Definition: dvdsubdec.c:438
attribute_deprecated uint8_t * data[AV_NUM_DATA_POINTERS]
pointers to the image data planes
Definition: avcodec.h:3864
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:3912
AVCodec ff_dvdsub_decoder
Definition: dvdsubdec.c:783
static void parse_palette(DVDSubContext *ctx, char *p)
Definition: dvdsubdec.c:621
Libavcodec external API header.
main external API structure.
Definition: avcodec.h:1659
static const AVOption options[]
Definition: dvdsubdec.c:770
static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header, const uint8_t *buf, int buf_size)
Definition: dvdsubdec.c:220
void * buf
Definition: avisynth_c.h:690
int extradata_size
Definition: avcodec.h:1775
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:299
Describe the class of an AVClass context structure.
Definition: log.h:67
#define YUV_TO_RGB2_CCIR(r, g, b, y1)
Definition: colorspace.h:55
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:406
byte swapping routines
static int decode_run_2bit(GetBitContext *gb, int *color)
Definition: dvdsubdec.c:67
#define snprintf
Definition: snprintf.h:34
uint8_t level
Definition: svq3.c:206
static int find_smallest_bounding_rectangle(AVSubtitle *s)
Definition: dvdsubdec.c:451
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:752
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:80
common internal api header.
if(ret< 0)
Definition: vf_mcdeint.c:282
static int dvdsub_parse_extradata(AVCodecContext *avctx)
Definition: dvdsubdec.c:693
uint32_t start_display_time
Definition: avcodec.h:3931
static void guess_palette(DVDSubContext *ctx, uint32_t *rgba_palette, uint32_t subtitle_color)
Definition: dvdsubdec.c:146
#define ff_crop_tab
void * priv_data
Definition: avcodec.h:1701
#define av_free(p)
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:81
int len
static int dvdsub_decode(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
Definition: dvdsubdec.c:562
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:445
#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:98
enum AVSubtitleType type
Definition: avcodec.h:3915
This structure stores compressed data.
Definition: avcodec.h:1567
char * palette_str
Definition: dvdsubdec.c:37
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:103
int forced_subs_only
Definition: dvdsubdec.c:44