FFmpeg  4.4
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/bswap.h"
31 
32 typedef struct DVDSubContext
33 {
34  AVClass *class;
35  uint32_t palette[16];
36  char *palette_str;
37  char *ifo_str;
40  uint8_t alpha[256];
41  uint8_t buf[0x10000];
42  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++;
62  YUV_TO_RGB2_CCIR(r, g, b, y);
63  *rgba++ = ((unsigned)*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  *color = get_bits(gb, 2 + 6*get_bits1(gb));
86  if (has_run) {
87  if (get_bits1(gb)) {
88  len = get_bits(gb, 7);
89  if (len == 0)
90  len = INT_MAX;
91  else
92  len += 9;
93  } else
94  len = get_bits(gb, 3) + 2;
95  } else
96  len = 1;
97  return len;
98 }
99 
100 static int decode_rle(uint8_t *bitmap, int linesize, int w, int h, uint8_t used_color[256],
101  const uint8_t *buf, int start, int buf_size, int is_8bit)
102 {
103  GetBitContext gb;
104  int bit_len;
105  int x, y, len, color;
106  uint8_t *d;
107 
108  if (start >= buf_size)
109  return -1;
110 
111  if (w <= 0 || h <= 0)
112  return -1;
113 
114  bit_len = (buf_size - start) * 8;
115  init_get_bits(&gb, buf + start, bit_len);
116 
117  x = 0;
118  y = 0;
119  d = bitmap;
120  for(;;) {
121  if (get_bits_count(&gb) > bit_len)
122  return -1;
123  if (is_8bit)
124  len = decode_run_8bit(&gb, &color);
125  else
126  len = decode_run_2bit(&gb, &color);
127  if (len != INT_MAX && len > w - x)
128  return AVERROR_INVALIDDATA;
129  len = FFMIN(len, w - x);
130  memset(d + x, color, len);
131  used_color[color] = 1;
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 - 1][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] * 17U) << 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] * 17U) << 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 > 1) {
372  reset_rects(sub_header);
373  memset(ctx->used_color, 0, sizeof(ctx->used_color));
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, ctx->used_color,
385  buf, offset1, buf_size, is_8bit) < 0)
386  goto fail;
387  if (decode_rle(bitmap + w, w * 2, w, h / 2, ctx->used_color,
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  int transparent = 1;
457 
458  if (s->num_rects == 0 || !s->rects || s->rects[0]->w <= 0 || s->rects[0]->h <= 0)
459  return 0;
460 
461  for(i = 0; i < s->rects[0]->nb_colors; i++) {
462  if ((((uint32_t *)s->rects[0]->data[1])[i] >> 24) == 0) {
463  transp_color[i] = 1;
464  } else if (ctx->used_color[i])
465  transparent = 0;
466  }
467  if (transparent)
468  return 0;
469  y1 = 0;
470  while (y1 < s->rects[0]->h && is_transp(s->rects[0]->data[0] + y1 * s->rects[0]->linesize[0],
471  1, s->rects[0]->w, transp_color))
472  y1++;
473  if (y1 == s->rects[0]->h) {
474  av_freep(&s->rects[0]->data[0]);
475  s->rects[0]->w = s->rects[0]->h = 0;
476  return 0;
477  }
478 
479  y2 = s->rects[0]->h - 1;
480  while (y2 > 0 && is_transp(s->rects[0]->data[0] + y2 * s->rects[0]->linesize[0], 1,
481  s->rects[0]->w, transp_color))
482  y2--;
483  x1 = 0;
484  while (x1 < (s->rects[0]->w - 1) && is_transp(s->rects[0]->data[0] + x1, s->rects[0]->linesize[0],
485  s->rects[0]->h, transp_color))
486  x1++;
487  x2 = s->rects[0]->w - 1;
488  while (x2 > 0 && is_transp(s->rects[0]->data[0] + x2, s->rects[0]->linesize[0], s->rects[0]->h,
489  transp_color))
490  x2--;
491  w = x2 - x1 + 1;
492  h = y2 - y1 + 1;
493  bitmap = av_malloc(w * h);
494  if (!bitmap)
495  return 1;
496  for(y = 0; y < h; y++) {
497  memcpy(bitmap + w * y, s->rects[0]->data[0] + x1 + (y1 + y) * s->rects[0]->linesize[0], w);
498  }
499  av_freep(&s->rects[0]->data[0]);
500  s->rects[0]->data[0] = bitmap;
501  s->rects[0]->linesize[0] = w;
502  s->rects[0]->w = w;
503  s->rects[0]->h = h;
504  s->rects[0]->x += x1;
505  s->rects[0]->y += y1;
506 
507 #if FF_API_AVPICTURE
509  for (i = 0; i < 4; i++) {
510  s->rects[0]->pict.data[i] = s->rects[0]->data[i];
511  s->rects[0]->pict.linesize[i] = s->rects[0]->linesize[i];
512  }
514 #endif
515 
516  return 1;
517 }
518 
519 #ifdef DEBUG
520 #define ALPHA_MIX(A,BACK,FORE) (((255-(A)) * (BACK) + (A) * (FORE)) / 255)
521 static void ppm_save(const char *filename, uint8_t *bitmap, int w, int h,
522  uint32_t *rgba_palette)
523 {
524  int x, y, alpha;
525  uint32_t v;
526  int back[3] = {0, 255, 0}; /* green background */
527  FILE *f;
528 
529  f = fopen(filename, "w");
530  if (!f) {
531  perror(filename);
532  return;
533  }
534  fprintf(f, "P6\n"
535  "%d %d\n"
536  "%d\n",
537  w, h, 255);
538  for(y = 0; y < h; y++) {
539  for(x = 0; x < w; x++) {
540  v = rgba_palette[bitmap[y * w + x]];
541  alpha = v >> 24;
542  putc(ALPHA_MIX(alpha, back[0], (v >> 16) & 0xff), f);
543  putc(ALPHA_MIX(alpha, back[1], (v >> 8) & 0xff), f);
544  putc(ALPHA_MIX(alpha, back[2], (v >> 0) & 0xff), f);
545  }
546  }
547  fclose(f);
548 }
549 #endif
550 
552  const uint8_t *buf, int buf_size)
553 {
554  DVDSubContext *ctx = avctx->priv_data;
555 
556  av_assert0(buf_size >= 0 && ctx->buf_size <= sizeof(ctx->buf));
557  if (buf_size >= sizeof(ctx->buf) - ctx->buf_size) {
558  av_log(avctx, AV_LOG_WARNING, "Attempt to reconstruct "
559  "too large SPU packets aborted.\n");
560  ctx->buf_size = 0;
561  return AVERROR_INVALIDDATA;
562  }
563  memcpy(ctx->buf + ctx->buf_size, buf, buf_size);
564  ctx->buf_size += buf_size;
565  return 0;
566 }
567 
568 static int dvdsub_decode(AVCodecContext *avctx,
569  void *data, int *data_size,
570  AVPacket *avpkt)
571 {
572  DVDSubContext *ctx = avctx->priv_data;
573  const uint8_t *buf = avpkt->data;
574  int buf_size = avpkt->size;
575  AVSubtitle *sub = data;
576  int appended = 0;
577  int is_menu;
578 
579  if (ctx->buf_size) {
580  int ret = append_to_cached_buf(avctx, buf, buf_size);
581  if (ret < 0) {
582  *data_size = 0;
583  return ret;
584  }
585  buf = ctx->buf;
586  buf_size = ctx->buf_size;
587  appended = 1;
588  }
589 
590  is_menu = decode_dvd_subtitles(ctx, sub, buf, buf_size);
591  if (is_menu == AVERROR(EAGAIN)) {
592  *data_size = 0;
593  return appended ? 0 : append_to_cached_buf(avctx, buf, buf_size);
594  }
595 
596  if (is_menu < 0) {
597  ctx->buf_size = 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 int parse_ifo_palette(DVDSubContext *ctx, char *p)
629 {
630  FILE *ifo;
631  char ifostr[12];
632  uint32_t sp_pgci, pgci, off_pgc, pgc;
633  uint8_t r, g, b, yuv[65], *buf;
634  int i, y, cb, cr, r_add, g_add, b_add;
635  int ret = 0;
636  const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
637 
638  ctx->has_palette = 0;
639  if ((ifo = fopen(p, "r")) == NULL) {
640  av_log(ctx, AV_LOG_WARNING, "Unable to open IFO file \"%s\": %s\n", p, av_err2str(AVERROR(errno)));
641  return AVERROR_EOF;
642  }
643  if (fread(ifostr, 12, 1, ifo) != 1 || memcmp(ifostr, "DVDVIDEO-VTS", 12)) {
644  av_log(ctx, AV_LOG_WARNING, "\"%s\" is not a proper IFO file\n", p);
645  ret = AVERROR_INVALIDDATA;
646  goto end;
647  }
648  if (fseek(ifo, 0xCC, SEEK_SET) == -1) {
649  ret = AVERROR(errno);
650  goto end;
651  }
652  if (fread(&sp_pgci, 4, 1, ifo) == 1) {
653  pgci = av_be2ne32(sp_pgci) * 2048;
654  if (fseek(ifo, pgci + 0x0C, SEEK_SET) == -1) {
655  ret = AVERROR(errno);
656  goto end;
657  }
658  if (fread(&off_pgc, 4, 1, ifo) == 1) {
659  pgc = pgci + av_be2ne32(off_pgc);
660  if (fseek(ifo, pgc + 0xA4, SEEK_SET) == -1) {
661  ret = AVERROR(errno);
662  goto end;
663  }
664  if (fread(yuv, 64, 1, ifo) == 1) {
665  buf = yuv;
666  for(i=0; i<16; i++) {
667  y = *++buf;
668  cr = *++buf;
669  cb = *++buf;
671  YUV_TO_RGB2_CCIR(r, g, b, y);
672  ctx->palette[i] = (r << 16) + (g << 8) + b;
673  buf++;
674  }
675  ctx->has_palette = 1;
676  }
677  }
678  }
679  if (ctx->has_palette == 0) {
680  av_log(ctx, AV_LOG_WARNING, "Failed to read palette from IFO file \"%s\"\n", p);
681  ret = AVERROR_INVALIDDATA;
682  }
683 end:
684  fclose(ifo);
685  return ret;
686 }
687 
689 {
691  char *dataorig, *data;
692  int ret = 1;
693 
694  if (!avctx->extradata || !avctx->extradata_size)
695  return 1;
696 
697  dataorig = data = av_malloc(avctx->extradata_size+1);
698  if (!data)
699  return AVERROR(ENOMEM);
700  memcpy(data, avctx->extradata, avctx->extradata_size);
701  data[avctx->extradata_size] = '\0';
702 
703  for(;;) {
704  int pos = strcspn(data, "\n\r");
705  if (pos==0 && *data==0)
706  break;
707 
708  if (strncmp("palette:", data, 8) == 0) {
709  ctx->has_palette = 1;
710  ff_dvdsub_parse_palette(ctx->palette, data + 8);
711  } else if (strncmp("size:", data, 5) == 0) {
712  int w, h;
713  if (sscanf(data + 5, "%dx%d", &w, &h) == 2) {
714  ret = ff_set_dimensions(avctx, w, h);
715  if (ret < 0)
716  goto fail;
717  }
718  }
719 
720  data += pos;
721  data += strspn(data, "\n\r");
722  }
723 
724 fail:
725  av_free(dataorig);
726  return ret;
727 }
728 
730 {
731  DVDSubContext *ctx = avctx->priv_data;
732  int ret;
733 
734  if ((ret = dvdsub_parse_extradata(avctx)) < 0)
735  return ret;
736 
737  if (ctx->ifo_str)
738  parse_ifo_palette(ctx, ctx->ifo_str);
739  if (ctx->palette_str) {
740  ctx->has_palette = 1;
741  ff_dvdsub_parse_palette(ctx->palette, ctx->palette_str);
742  }
743  if (ctx->has_palette) {
744  int i;
745  av_log(avctx, AV_LOG_DEBUG, "palette:");
746  for(i=0;i<16;i++)
747  av_log(avctx, AV_LOG_DEBUG, " 0x%06"PRIx32, ctx->palette[i]);
748  av_log(avctx, AV_LOG_DEBUG, "\n");
749  }
750 
751  return 1;
752 }
753 
754 static void dvdsub_flush(AVCodecContext *avctx)
755 {
756  DVDSubContext *ctx = avctx->priv_data;
757  ctx->buf_size = 0;
758 }
759 
761 {
762  dvdsub_flush(avctx);
763  return 0;
764 }
765 
766 #define OFFSET(field) offsetof(DVDSubContext, field)
767 #define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
768 static const AVOption options[] = {
769  { "palette", "set the global palette", OFFSET(palette_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SD },
770  { "ifo_palette", "obtain the global palette from .IFO file", OFFSET(ifo_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SD },
771  { "forced_subs_only", "Only show forced subtitles", OFFSET(forced_subs_only), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, SD},
772  { NULL }
773 };
774 static const AVClass dvdsub_class = {
775  .class_name = "dvdsubdec",
776  .item_name = av_default_item_name,
777  .option = options,
778  .version = LIBAVUTIL_VERSION_INT,
779 };
780 
782  .name = "dvdsub",
783  .long_name = NULL_IF_CONFIG_SMALL("DVD subtitles"),
784  .type = AVMEDIA_TYPE_SUBTITLE,
786  .priv_data_size = sizeof(DVDSubContext),
787  .init = dvdsub_init,
789  .flush = dvdsub_flush,
790  .close = dvdsub_close,
791  .priv_class = &dvdsub_class,
792 };
static void flush(AVCodecContext *avctx)
Macro definitions for various function/variable attributes.
#define av_cold
Definition: attributes.h:88
uint8_t
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
Libavcodec external API header.
#define AV_RB32
Definition: intreadwrite.h:130
#define AV_RB16
Definition: intreadwrite.h:53
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
byte swapping routines
#define av_be2ne32(x)
Definition: bswap.h:93
#define s(width, name)
Definition: cbs_vp9.c:257
#define f(width, name)
Definition: cbs_vp9.c:255
#define fail()
Definition: checkasm.h:133
#define FFMIN(a, b)
Definition: common.h:105
#define NULL
Definition: coverity.c:32
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
static float sub(float src0, float src1)
#define cm
Definition: dvbsubdec.c:37
void ff_dvdsub_parse_palette(uint32_t *palette, const char *p)
Definition: dvdsub.c:26
static void dvdsub_flush(AVCodecContext *avctx)
Definition: dvdsubdec.c:754
AVCodec ff_dvdsub_decoder
Definition: dvdsubdec.c:781
static av_cold int dvdsub_close(AVCodecContext *avctx)
Definition: dvdsubdec.c:760
static int dvdsub_parse_extradata(AVCodecContext *avctx)
Definition: dvdsubdec.c:688
static av_cold int dvdsub_init(AVCodecContext *avctx)
Definition: dvdsubdec.c:729
static void reset_rects(AVSubtitle *sub_header)
Definition: dvdsubdec.c:203
static const AVOption options[]
Definition: dvdsubdec.c:768
#define READ_OFFSET(a)
Definition: dvdsubdec.c:218
static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header, const uint8_t *buf, int buf_size)
Definition: dvdsubdec.c:220
static void guess_palette(DVDSubContext *ctx, uint32_t *rgba_palette, uint32_t subtitle_color)
Definition: dvdsubdec.c:146
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:100
static const AVClass dvdsub_class
Definition: dvdsubdec.c:774
static int decode_run_8bit(GetBitContext *gb, int *color)
Definition: dvdsubdec.c:81
static int parse_ifo_palette(DVDSubContext *ctx, char *p)
Definition: dvdsubdec.c:628
#define SD
Definition: dvdsubdec.c:767
static int append_to_cached_buf(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: dvdsubdec.c:551
static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values)
Definition: dvdsubdec.c:50
static int dvdsub_decode(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
Definition: dvdsubdec.c:568
static int find_smallest_bounding_rectangle(DVDSubContext *ctx, AVSubtitle *s)
Definition: dvdsubdec.c:451
#define OFFSET(field)
Definition: dvdsubdec.c:766
static int is_transp(const uint8_t *buf, int pitch, int n, const uint8_t *transp_color)
Definition: dvdsubdec.c:438
static int decode_run_2bit(GetBitContext *gb, int *color)
Definition: dvdsubdec.c:67
bitstream reader API header.
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:219
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:693
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:659
@ AV_OPT_TYPE_BOOL
Definition: opt.h:242
@ AV_OPT_TYPE_STRING
Definition: opt.h:229
#define AV_SUBTITLE_FLAG_FORCED
Definition: avcodec.h:2685
@ SUBTITLE_BITMAP
A bitmap, pict will be set.
Definition: avcodec.h:2670
@ AV_CODEC_ID_DVD_SUBTITLE
Definition: codec_id.h:523
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define av_err2str(errnum)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: error.h:119
#define AVERROR(e)
Definition: error.h:43
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:215
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:237
@ AVMEDIA_TYPE_SUBTITLE
Definition: avutil.h:204
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
static const int16_t alpha[]
Definition: ilbcdata.h:55
misc image utilities
int i
Definition: input.c:407
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:84
Various defines for YUV<->RGB conversion.
#define YUV_TO_RGB1_CCIR(cb1, cr1)
Definition: colorspace.h:34
#define YUV_TO_RGB2_CCIR(r, g, b, y1)
Definition: colorspace.h:55
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:83
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:84
uint8_t w
Definition: llviddspenc.c:39
static const uint32_t color[16+AV_CLASS_CATEGORY_NB]
Definition: log.c:92
#define MAX_NEG_CROP
Definition: mathops.h:31
#define ff_crop_tab
const char data[16]
Definition: mxf.c:142
AVOptions.
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
#define snprintf
Definition: snprintf.h:34
unsigned int pos
Definition: spdifenc.c:412
Describe the class of an AVClass context structure.
Definition: log.h:67
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
main external API structure.
Definition: avcodec.h:536
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:637
int extradata_size
Definition: avcodec.h:638
void * priv_data
Definition: avcodec.h:563
AVCodec.
Definition: codec.h:197
const char * name
Name of the codec implementation.
Definition: codec.h:204
AVOption.
Definition: opt.h:248
This structure stores compressed data.
Definition: packet.h:346
int size
Definition: packet.h:370
uint8_t * data
Definition: packet.h:369
attribute_deprecated uint8_t * data[AV_NUM_DATA_POINTERS]
pointers to the image data planes
Definition: avcodec.h:2657
attribute_deprecated int linesize[AV_NUM_DATA_POINTERS]
number of bytes per line
Definition: avcodec.h:2659
int x
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:2688
int w
width of pict, undefined when pict is not set
Definition: avcodec.h:2690
attribute_deprecated AVPicture pict
Definition: avcodec.h:2699
int nb_colors
number of colors in pict, undefined when pict is not set
Definition: avcodec.h:2692
uint8_t * data[4]
data+linesize for the bitmap of this subtitle.
Definition: avcodec.h:2705
int y
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:2689
enum AVSubtitleType type
Definition: avcodec.h:2708
int linesize[4]
Definition: avcodec.h:2706
int h
height of pict, undefined when pict is not set
Definition: avcodec.h:2691
uint32_t start_display_time
Definition: avcodec.h:2724
uint32_t end_display_time
Definition: avcodec.h:2725
unsigned num_rects
Definition: avcodec.h:2726
AVSubtitleRect ** rects
Definition: avcodec.h:2727
int has_palette
Definition: dvdsubdec.c:38
uint8_t buf[0x10000]
Definition: dvdsubdec.c:41
uint8_t used_color[256]
Definition: dvdsubdec.c:44
int forced_subs_only
Definition: dvdsubdec.c:43
uint32_t palette[16]
Definition: dvdsubdec.c:35
char * ifo_str
Definition: dvdsubdec.c:37
uint8_t colormap[4]
Definition: dvdsubdec.c:39
uint8_t alpha[256]
Definition: dvdsubdec.c:40
char * palette_str
Definition: dvdsubdec.c:36
uint8_t level
Definition: svq3.c:206
#define av_free(p)
#define ff_dlog(a,...)
#define av_freep(p)
#define av_malloc(s)
#define av_log(a,...)
AVFormatContext * ctx
Definition: movenc.c:48
int size
const char * b
Definition: vf_curves.c:118
const char * g
Definition: vf_curves.c:117
const char * r
Definition: vf_curves.c:116
static double cr(void *priv, double x, double y)
Definition: vf_geq.c:216
static double cb(void *priv, double x, double y)
Definition: vf_geq.c:215
if(ret< 0)
Definition: vf_mcdeint.c:282
int len