FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
dvbsubdec.c
Go to the documentation of this file.
1 /*
2  * DVB subtitle decoding
3  * Copyright (c) 2005 Ian Caulfield
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 "bytestream.h"
25 #include "internal.h"
26 #include "libavutil/colorspace.h"
27 #include "libavutil/opt.h"
28 
29 #define DVBSUB_PAGE_SEGMENT 0x10
30 #define DVBSUB_REGION_SEGMENT 0x11
31 #define DVBSUB_CLUT_SEGMENT 0x12
32 #define DVBSUB_OBJECT_SEGMENT 0x13
33 #define DVBSUB_DISPLAYDEFINITION_SEGMENT 0x14
34 #define DVBSUB_DISPLAY_SEGMENT 0x80
35 
36 #define cm (ff_crop_tab + MAX_NEG_CROP)
37 
38 #ifdef DEBUG
39 #if 0
40 static void png_save(const char *filename, uint8_t *bitmap, int w, int h,
41  uint32_t *rgba_palette)
42 {
43  int x, y, v;
44  FILE *f;
45  char fname[40], fname2[40];
46  char command[1024];
47 
48  snprintf(fname, 40, "%s.ppm", filename);
49 
50  f = fopen(fname, "w");
51  if (!f) {
52  perror(fname);
53  return;
54  }
55  fprintf(f, "P6\n"
56  "%d %d\n"
57  "%d\n",
58  w, h, 255);
59  for(y = 0; y < h; y++) {
60  for(x = 0; x < w; x++) {
61  v = rgba_palette[bitmap[y * w + x]];
62  putc((v >> 16) & 0xff, f);
63  putc((v >> 8) & 0xff, f);
64  putc((v >> 0) & 0xff, f);
65  }
66  }
67  fclose(f);
68 
69 
70  snprintf(fname2, 40, "%s-a.pgm", filename);
71 
72  f = fopen(fname2, "w");
73  if (!f) {
74  perror(fname2);
75  return;
76  }
77  fprintf(f, "P5\n"
78  "%d %d\n"
79  "%d\n",
80  w, h, 255);
81  for(y = 0; y < h; y++) {
82  for(x = 0; x < w; x++) {
83  v = rgba_palette[bitmap[y * w + x]];
84  putc((v >> 24) & 0xff, f);
85  }
86  }
87  fclose(f);
88 
89  snprintf(command, 1024, "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
90  system(command);
91 
92  snprintf(command, 1024, "rm %s %s", fname, fname2);
93  system(command);
94 }
95 #endif
96 
97 static void png_save2(const char *filename, uint32_t *bitmap, int w, int h)
98 {
99  int x, y, v;
100  FILE *f;
101  char fname[40], fname2[40];
102  char command[1024];
103 
104  snprintf(fname, sizeof(fname), "%s.ppm", filename);
105 
106  f = fopen(fname, "w");
107  if (!f) {
108  perror(fname);
109  return;
110  }
111  fprintf(f, "P6\n"
112  "%d %d\n"
113  "%d\n",
114  w, h, 255);
115  for(y = 0; y < h; y++) {
116  for(x = 0; x < w; x++) {
117  v = bitmap[y * w + x];
118  putc((v >> 16) & 0xff, f);
119  putc((v >> 8) & 0xff, f);
120  putc((v >> 0) & 0xff, f);
121  }
122  }
123  fclose(f);
124 
125 
126  snprintf(fname2, sizeof(fname2), "%s-a.pgm", filename);
127 
128  f = fopen(fname2, "w");
129  if (!f) {
130  perror(fname2);
131  return;
132  }
133  fprintf(f, "P5\n"
134  "%d %d\n"
135  "%d\n",
136  w, h, 255);
137  for(y = 0; y < h; y++) {
138  for(x = 0; x < w; x++) {
139  v = bitmap[y * w + x];
140  putc((v >> 24) & 0xff, f);
141  }
142  }
143  fclose(f);
144 
145  snprintf(command, sizeof(command), "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
146  system(command);
147 
148  snprintf(command, sizeof(command), "rm %s %s", fname, fname2);
149  system(command);
150 }
151 #endif
152 
153 #define RGBA(r,g,b,a) (((unsigned)(a) << 24) | ((r) << 16) | ((g) << 8) | (b))
154 
155 typedef struct DVBSubCLUT {
156  int id;
157  int version;
158 
159  uint32_t clut4[4];
160  uint32_t clut16[16];
161  uint32_t clut256[256];
162 
163  struct DVBSubCLUT *next;
164 } DVBSubCLUT;
165 
167 
168 typedef struct DVBSubObjectDisplay {
171 
172  int x_pos;
173  int y_pos;
174 
175  int fgcolor;
176  int bgcolor;
177 
181 
182 typedef struct DVBSubObject {
183  int id;
184  int version;
185 
186  int type;
187 
189 
191 } DVBSubObject;
192 
193 typedef struct DVBSubRegionDisplay {
195 
196  int x_pos;
197  int y_pos;
198 
201 
202 typedef struct DVBSubRegion {
203  int id;
204  int version;
205 
206  int width;
207  int height;
208  int depth;
209 
210  int clut;
211  int bgcolor;
212 
214  int buf_size;
215  int dirty;
216 
218 
220 } DVBSubRegion;
221 
222 typedef struct DVBSubDisplayDefinition {
223  int version;
224 
225  int x;
226  int y;
227  int width;
228  int height;
230 
231 typedef struct DVBSubContext {
232  AVClass *class;
235 
236  int version;
237  int time_out;
238  int compute_edt; /**< if 1 end display time calculated using pts
239  if 0 (Default) calculated using time out */
242  int64_t prev_start;
246 
249 } DVBSubContext;
250 
251 
252 static DVBSubObject* get_object(DVBSubContext *ctx, int object_id)
253 {
254  DVBSubObject *ptr = ctx->object_list;
255 
256  while (ptr && ptr->id != object_id) {
257  ptr = ptr->next;
258  }
259 
260  return ptr;
261 }
262 
263 static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id)
264 {
265  DVBSubCLUT *ptr = ctx->clut_list;
266 
267  while (ptr && ptr->id != clut_id) {
268  ptr = ptr->next;
269  }
270 
271  return ptr;
272 }
273 
274 static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)
275 {
276  DVBSubRegion *ptr = ctx->region_list;
277 
278  while (ptr && ptr->id != region_id) {
279  ptr = ptr->next;
280  }
281 
282  return ptr;
283 }
284 
286 {
287  DVBSubObject *object, *obj2, **obj2_ptr;
288  DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr;
289 
290  while (region->display_list) {
291  display = region->display_list;
292 
293  object = get_object(ctx, display->object_id);
294 
295  if (object) {
296  obj_disp_ptr = &object->display_list;
297  obj_disp = *obj_disp_ptr;
298 
299  while (obj_disp && obj_disp != display) {
300  obj_disp_ptr = &obj_disp->object_list_next;
301  obj_disp = *obj_disp_ptr;
302  }
303 
304  if (obj_disp) {
305  *obj_disp_ptr = obj_disp->object_list_next;
306 
307  if (!object->display_list) {
308  obj2_ptr = &ctx->object_list;
309  obj2 = *obj2_ptr;
310 
311  while (obj2 != object) {
312  av_assert0(obj2);
313  obj2_ptr = &obj2->next;
314  obj2 = *obj2_ptr;
315  }
316 
317  *obj2_ptr = obj2->next;
318 
319  av_freep(&obj2);
320  }
321  }
322  }
323 
324  region->display_list = display->region_list_next;
325 
326  av_freep(&display);
327  }
328 
329 }
330 
332 {
333  while (ctx->clut_list) {
334  DVBSubCLUT *clut = ctx->clut_list;
335 
336  ctx->clut_list = clut->next;
337 
338  av_freep(&clut);
339  }
340 }
341 
343 {
344  while (ctx->object_list) {
345  DVBSubObject *object = ctx->object_list;
346 
347  ctx->object_list = object->next;
348 
349  av_freep(&object);
350  }
351 }
352 
354 {
355  while (ctx->region_list) {
356  DVBSubRegion *region = ctx->region_list;
357 
358  ctx->region_list = region->next;
359 
360  delete_region_display_list(ctx, region);
361 
362  av_freep(&region->pbuf);
363  av_freep(&region);
364  }
365 }
366 
368 {
369  int i, r, g, b, a = 0;
370  DVBSubContext *ctx = avctx->priv_data;
371 
372  if (ctx->substream < 0) {
373  ctx->composition_id = -1;
374  ctx->ancillary_id = -1;
375  } else if (!avctx->extradata || (avctx->extradata_size < 4) || ((avctx->extradata_size % 5 != 0) && (avctx->extradata_size != 4))) {
376  av_log(avctx, AV_LOG_WARNING, "Invalid DVB subtitles stream extradata!\n");
377  ctx->composition_id = -1;
378  ctx->ancillary_id = -1;
379  } else {
380  if (avctx->extradata_size > 5*ctx->substream + 2) {
381  ctx->composition_id = AV_RB16(avctx->extradata + 5*ctx->substream);
382  ctx->ancillary_id = AV_RB16(avctx->extradata + 5*ctx->substream + 2);
383  } else {
384  av_log(avctx, AV_LOG_WARNING, "Selected DVB subtitles sub-stream %d is not available\n", ctx->substream);
385  ctx->composition_id = AV_RB16(avctx->extradata);
386  ctx->ancillary_id = AV_RB16(avctx->extradata + 2);
387  }
388  }
389 
390  ctx->version = -1;
391  ctx->prev_start = AV_NOPTS_VALUE;
392 
393  default_clut.id = -1;
394  default_clut.next = NULL;
395 
396  default_clut.clut4[0] = RGBA( 0, 0, 0, 0);
397  default_clut.clut4[1] = RGBA(255, 255, 255, 255);
398  default_clut.clut4[2] = RGBA( 0, 0, 0, 255);
399  default_clut.clut4[3] = RGBA(127, 127, 127, 255);
400 
401  default_clut.clut16[0] = RGBA( 0, 0, 0, 0);
402  for (i = 1; i < 16; i++) {
403  if (i < 8) {
404  r = (i & 1) ? 255 : 0;
405  g = (i & 2) ? 255 : 0;
406  b = (i & 4) ? 255 : 0;
407  } else {
408  r = (i & 1) ? 127 : 0;
409  g = (i & 2) ? 127 : 0;
410  b = (i & 4) ? 127 : 0;
411  }
412  default_clut.clut16[i] = RGBA(r, g, b, 255);
413  }
414 
415  default_clut.clut256[0] = RGBA( 0, 0, 0, 0);
416  for (i = 1; i < 256; i++) {
417  if (i < 8) {
418  r = (i & 1) ? 255 : 0;
419  g = (i & 2) ? 255 : 0;
420  b = (i & 4) ? 255 : 0;
421  a = 63;
422  } else {
423  switch (i & 0x88) {
424  case 0x00:
425  r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
426  g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
427  b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
428  a = 255;
429  break;
430  case 0x08:
431  r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
432  g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
433  b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
434  a = 127;
435  break;
436  case 0x80:
437  r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
438  g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
439  b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
440  a = 255;
441  break;
442  case 0x88:
443  r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
444  g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
445  b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
446  a = 255;
447  break;
448  }
449  }
450  default_clut.clut256[i] = RGBA(r, g, b, a);
451  }
452 
453  return 0;
454 }
455 
457 {
458  DVBSubContext *ctx = avctx->priv_data;
459  DVBSubRegionDisplay *display;
460 
461  delete_regions(ctx);
462 
463  delete_objects(ctx);
464 
465  delete_cluts(ctx);
466 
468 
469  while (ctx->display_list) {
470  display = ctx->display_list;
471  ctx->display_list = display->next;
472 
473  av_freep(&display);
474  }
475 
476  return 0;
477 }
478 
480  uint8_t *destbuf, int dbuf_len,
481  const uint8_t **srcbuf, int buf_size,
482  int non_mod, uint8_t *map_table, int x_pos)
483 {
484  GetBitContext gb;
485 
486  int bits;
487  int run_length;
488  int pixels_read = x_pos;
489 
490  init_get_bits(&gb, *srcbuf, buf_size << 3);
491 
492  destbuf += x_pos;
493 
494  while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
495  bits = get_bits(&gb, 2);
496 
497  if (bits) {
498  if (non_mod != 1 || bits != 1) {
499  if (map_table)
500  *destbuf++ = map_table[bits];
501  else
502  *destbuf++ = bits;
503  }
504  pixels_read++;
505  } else {
506  bits = get_bits1(&gb);
507  if (bits == 1) {
508  run_length = get_bits(&gb, 3) + 3;
509  bits = get_bits(&gb, 2);
510 
511  if (non_mod == 1 && bits == 1)
512  pixels_read += run_length;
513  else {
514  if (map_table)
515  bits = map_table[bits];
516  while (run_length-- > 0 && pixels_read < dbuf_len) {
517  *destbuf++ = bits;
518  pixels_read++;
519  }
520  }
521  } else {
522  bits = get_bits1(&gb);
523  if (bits == 0) {
524  bits = get_bits(&gb, 2);
525  if (bits == 2) {
526  run_length = get_bits(&gb, 4) + 12;
527  bits = get_bits(&gb, 2);
528 
529  if (non_mod == 1 && bits == 1)
530  pixels_read += run_length;
531  else {
532  if (map_table)
533  bits = map_table[bits];
534  while (run_length-- > 0 && pixels_read < dbuf_len) {
535  *destbuf++ = bits;
536  pixels_read++;
537  }
538  }
539  } else if (bits == 3) {
540  run_length = get_bits(&gb, 8) + 29;
541  bits = get_bits(&gb, 2);
542 
543  if (non_mod == 1 && bits == 1)
544  pixels_read += run_length;
545  else {
546  if (map_table)
547  bits = map_table[bits];
548  while (run_length-- > 0 && pixels_read < dbuf_len) {
549  *destbuf++ = bits;
550  pixels_read++;
551  }
552  }
553  } else if (bits == 1) {
554  if (map_table)
555  bits = map_table[0];
556  else
557  bits = 0;
558  run_length = 2;
559  while (run_length-- > 0 && pixels_read < dbuf_len) {
560  *destbuf++ = bits;
561  pixels_read++;
562  }
563  } else {
564  (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
565  return pixels_read;
566  }
567  } else {
568  if (map_table)
569  bits = map_table[0];
570  else
571  bits = 0;
572  *destbuf++ = bits;
573  pixels_read++;
574  }
575  }
576  }
577  }
578 
579  if (get_bits(&gb, 6))
580  av_log(avctx, AV_LOG_ERROR, "line overflow\n");
581 
582  (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
583 
584  return pixels_read;
585 }
586 
587 static int dvbsub_read_4bit_string(AVCodecContext *avctx, uint8_t *destbuf, int dbuf_len,
588  const uint8_t **srcbuf, int buf_size,
589  int non_mod, uint8_t *map_table, int x_pos)
590 {
591  GetBitContext gb;
592 
593  int bits;
594  int run_length;
595  int pixels_read = x_pos;
596 
597  init_get_bits(&gb, *srcbuf, buf_size << 3);
598 
599  destbuf += x_pos;
600 
601  while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
602  bits = get_bits(&gb, 4);
603 
604  if (bits) {
605  if (non_mod != 1 || bits != 1) {
606  if (map_table)
607  *destbuf++ = map_table[bits];
608  else
609  *destbuf++ = bits;
610  }
611  pixels_read++;
612  } else {
613  bits = get_bits1(&gb);
614  if (bits == 0) {
615  run_length = get_bits(&gb, 3);
616 
617  if (run_length == 0) {
618  (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
619  return pixels_read;
620  }
621 
622  run_length += 2;
623 
624  if (map_table)
625  bits = map_table[0];
626  else
627  bits = 0;
628 
629  while (run_length-- > 0 && pixels_read < dbuf_len) {
630  *destbuf++ = bits;
631  pixels_read++;
632  }
633  } else {
634  bits = get_bits1(&gb);
635  if (bits == 0) {
636  run_length = get_bits(&gb, 2) + 4;
637  bits = get_bits(&gb, 4);
638 
639  if (non_mod == 1 && bits == 1)
640  pixels_read += run_length;
641  else {
642  if (map_table)
643  bits = map_table[bits];
644  while (run_length-- > 0 && pixels_read < dbuf_len) {
645  *destbuf++ = bits;
646  pixels_read++;
647  }
648  }
649  } else {
650  bits = get_bits(&gb, 2);
651  if (bits == 2) {
652  run_length = get_bits(&gb, 4) + 9;
653  bits = get_bits(&gb, 4);
654 
655  if (non_mod == 1 && bits == 1)
656  pixels_read += run_length;
657  else {
658  if (map_table)
659  bits = map_table[bits];
660  while (run_length-- > 0 && pixels_read < dbuf_len) {
661  *destbuf++ = bits;
662  pixels_read++;
663  }
664  }
665  } else if (bits == 3) {
666  run_length = get_bits(&gb, 8) + 25;
667  bits = get_bits(&gb, 4);
668 
669  if (non_mod == 1 && bits == 1)
670  pixels_read += run_length;
671  else {
672  if (map_table)
673  bits = map_table[bits];
674  while (run_length-- > 0 && pixels_read < dbuf_len) {
675  *destbuf++ = bits;
676  pixels_read++;
677  }
678  }
679  } else if (bits == 1) {
680  if (map_table)
681  bits = map_table[0];
682  else
683  bits = 0;
684  run_length = 2;
685  while (run_length-- > 0 && pixels_read < dbuf_len) {
686  *destbuf++ = bits;
687  pixels_read++;
688  }
689  } else {
690  if (map_table)
691  bits = map_table[0];
692  else
693  bits = 0;
694  *destbuf++ = bits;
695  pixels_read ++;
696  }
697  }
698  }
699  }
700  }
701 
702  if (get_bits(&gb, 8))
703  av_log(avctx, AV_LOG_ERROR, "line overflow\n");
704 
705  (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
706 
707  return pixels_read;
708 }
709 
711  uint8_t *destbuf, int dbuf_len,
712  const uint8_t **srcbuf, int buf_size,
713  int non_mod, uint8_t *map_table, int x_pos)
714 {
715  const uint8_t *sbuf_end = (*srcbuf) + buf_size;
716  int bits;
717  int run_length;
718  int pixels_read = x_pos;
719 
720  destbuf += x_pos;
721 
722  while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
723  bits = *(*srcbuf)++;
724 
725  if (bits) {
726  if (non_mod != 1 || bits != 1) {
727  if (map_table)
728  *destbuf++ = map_table[bits];
729  else
730  *destbuf++ = bits;
731  }
732  pixels_read++;
733  } else {
734  bits = *(*srcbuf)++;
735  run_length = bits & 0x7f;
736  if ((bits & 0x80) == 0) {
737  if (run_length == 0) {
738  return pixels_read;
739  }
740 
741  bits = 0;
742  } else {
743  bits = *(*srcbuf)++;
744  }
745  if (non_mod == 1 && bits == 1)
746  pixels_read += run_length;
747  else {
748  if (map_table)
749  bits = map_table[bits];
750  while (run_length-- > 0 && pixels_read < dbuf_len) {
751  *destbuf++ = bits;
752  pixels_read++;
753  }
754  }
755  }
756  }
757 
758  if (*(*srcbuf)++)
759  av_log(avctx, AV_LOG_ERROR, "line overflow\n");
760 
761  return pixels_read;
762 }
763 
764 static void compute_default_clut(AVSubtitleRect *rect, int w, int h)
765 {
766  uint8_t list[256] = {0};
767  uint8_t list_inv[256];
768  int counttab[256] = {0};
769  int count, i, x, y;
770 
771 #define V(x,y) rect->data[0][(x) + (y)*rect->linesize[0]]
772  for (y = 0; y<h; y++) {
773  for (x = 0; x<w; x++) {
774  int v = V(x,y) + 1;
775  int vl = x ? V(x-1,y) + 1 : 0;
776  int vr = x+1<w ? V(x+1,y) + 1 : 0;
777  int vt = y ? V(x,y-1) + 1 : 0;
778  int vb = y+1<h ? V(x,y+1) + 1 : 0;
779  counttab[v-1] += !!((v!=vl) + (v!=vr) + (v!=vt) + (v!=vb));
780  }
781  }
782 #define L(x,y) list[ rect->data[0][(x) + (y)*rect->linesize[0]] ]
783 
784  for (i = 0; i<256; i++) {
785  int scoretab[256] = {0};
786  int bestscore = 0;
787  int bestv = 0;
788  for (y = 0; y<h; y++) {
789  for (x = 0; x<w; x++) {
790  int v = rect->data[0][x + y*rect->linesize[0]];
791  int l_m = list[v];
792  int l_l = x ? L(x-1, y) : 1;
793  int l_r = x+1<w ? L(x+1, y) : 1;
794  int l_t = y ? L(x, y-1) : 1;
795  int l_b = y+1<h ? L(x, y+1) : 1;
796  int score;
797  if (l_m)
798  continue;
799  scoretab[v] += l_l + l_r + l_t + l_b;
800  score = 1024LL*scoretab[v] / counttab[v];
801  if (score > bestscore) {
802  bestscore = score;
803  bestv = v;
804  }
805  }
806  }
807  if (!bestscore)
808  break;
809  list [ bestv ] = 1;
810  list_inv[ i ] = bestv;
811  }
812 
813  count = i - 1;
814  for (i--; i>=0; i--) {
815  int v = i*255/count;
816  AV_WN32(rect->data[1] + 4*list_inv[i], RGBA(v/2,v,v/2,v));
817  }
818 }
819 
820 
821 static int save_subtitle_set(AVCodecContext *avctx, AVSubtitle *sub, int *got_output)
822 {
823  DVBSubContext *ctx = avctx->priv_data;
824  DVBSubRegionDisplay *display;
825  DVBSubDisplayDefinition *display_def = ctx->display_definition;
826  DVBSubRegion *region;
828  DVBSubCLUT *clut;
829  uint32_t *clut_table;
830  int i;
831  int offset_x=0, offset_y=0;
832  int ret = 0;
833 
834 
835  if (display_def) {
836  offset_x = display_def->x;
837  offset_y = display_def->y;
838  }
839 
840  /* Not touching AVSubtitles again*/
841  if(sub->num_rects) {
842  avpriv_request_sample(ctx, "Different Version of Segment asked Twice");
843  return AVERROR_PATCHWELCOME;
844  }
845  for (display = ctx->display_list; display; display = display->next) {
846  region = get_region(ctx, display->region_id);
847  if (region && region->dirty)
848  sub->num_rects++;
849  }
850 
851  if(ctx->compute_edt == 0) {
852  sub->end_display_time = ctx->time_out * 1000;
853  *got_output = 1;
854  } else if (ctx->prev_start != AV_NOPTS_VALUE) {
855  sub->end_display_time = av_rescale_q((sub->pts - ctx->prev_start ), AV_TIME_BASE_Q, (AVRational){ 1, 1000 }) - 1;
856  *got_output = 1;
857  }
858  if (sub->num_rects > 0) {
859 
860  sub->rects = av_mallocz_array(sizeof(*sub->rects), sub->num_rects);
861  if (!sub->rects) {
862  ret = AVERROR(ENOMEM);
863  goto fail;
864  }
865 
866  for(i=0; i<sub->num_rects; i++)
867  sub->rects[i] = av_mallocz(sizeof(*sub->rects[i]));
868 
869  i = 0;
870 
871  for (display = ctx->display_list; display; display = display->next) {
872  region = get_region(ctx, display->region_id);
873 
874  if (!region)
875  continue;
876 
877  if (!region->dirty)
878  continue;
879 
880  rect = sub->rects[i];
881  rect->x = display->x_pos + offset_x;
882  rect->y = display->y_pos + offset_y;
883  rect->w = region->width;
884  rect->h = region->height;
885  rect->nb_colors = (1 << region->depth);
886  rect->type = SUBTITLE_BITMAP;
887  rect->linesize[0] = region->width;
888 
889  clut = get_clut(ctx, region->clut);
890 
891  if (!clut)
892  clut = &default_clut;
893 
894  switch (region->depth) {
895  case 2:
896  clut_table = clut->clut4;
897  break;
898  case 8:
899  clut_table = clut->clut256;
900  break;
901  case 4:
902  default:
903  clut_table = clut->clut16;
904  break;
905  }
906 
907  rect->data[1] = av_mallocz(AVPALETTE_SIZE);
908  if (!rect->data[1]) {
909  ret = AVERROR(ENOMEM);
910  goto fail;
911  }
912  memcpy(rect->data[1], clut_table, (1 << region->depth) * sizeof(uint32_t));
913 
914  rect->data[0] = av_malloc(region->buf_size);
915  if (!rect->data[0]) {
916  ret = AVERROR(ENOMEM);
917  goto fail;
918  }
919 
920  memcpy(rect->data[0], region->pbuf, region->buf_size);
921 
922  if ((clut == &default_clut && ctx->compute_clut == -1) || ctx->compute_clut == 1)
924 
925 #if FF_API_AVPICTURE
927 {
928  int j;
929  for (j = 0; j < 4; j++) {
930  rect->pict.data[j] = rect->data[j];
931  rect->pict.linesize[j] = rect->linesize[j];
932  }
933 }
935 #endif
936 
937  i++;
938  }
939  }
940 
941  return 0;
942 fail:
943  if (sub->rects) {
944  for(i=0; i<sub->num_rects; i++) {
945  rect = sub->rects[i];
946  if (rect) {
947  av_freep(&rect->data[0]);
948  av_freep(&rect->data[1]);
949  }
950  av_freep(&sub->rects[i]);
951  }
952  av_freep(&sub->rects);
953  }
954  sub->num_rects = 0;
955  return ret;
956 }
957 
959  const uint8_t *buf, int buf_size, int top_bottom, int non_mod)
960 {
961  DVBSubContext *ctx = avctx->priv_data;
962 
963  DVBSubRegion *region = get_region(ctx, display->region_id);
964  const uint8_t *buf_end = buf + buf_size;
965  uint8_t *pbuf;
966  int x_pos, y_pos;
967  int i;
968 
969  uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf};
970  uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
971  uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
972  0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
973  uint8_t *map_table;
974 
975 #if 0
976  ff_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size,
977  top_bottom ? "bottom" : "top");
978 
979  for (i = 0; i < buf_size; i++) {
980  if (i % 16 == 0)
981  ff_dlog(avctx, "0x%8p: ", buf+i);
982 
983  ff_dlog(avctx, "%02x ", buf[i]);
984  if (i % 16 == 15)
985  ff_dlog(avctx, "\n");
986  }
987 
988  if (i % 16)
989  ff_dlog(avctx, "\n");
990 #endif
991 
992  if (!region)
993  return;
994 
995  pbuf = region->pbuf;
996  region->dirty = 1;
997 
998  x_pos = display->x_pos;
999  y_pos = display->y_pos;
1000 
1001  y_pos += top_bottom;
1002 
1003  while (buf < buf_end) {
1004  if ((*buf!=0xf0 && x_pos >= region->width) || y_pos >= region->height) {
1005  av_log(avctx, AV_LOG_ERROR, "Invalid object location! %d-%d %d-%d %02x\n", x_pos, region->width, y_pos, region->height, *buf);
1006  return;
1007  }
1008 
1009  switch (*buf++) {
1010  case 0x10:
1011  if (region->depth == 8)
1012  map_table = map2to8;
1013  else if (region->depth == 4)
1014  map_table = map2to4;
1015  else
1016  map_table = NULL;
1017 
1018  x_pos = dvbsub_read_2bit_string(avctx, pbuf + (y_pos * region->width),
1019  region->width, &buf, buf_end - buf,
1020  non_mod, map_table, x_pos);
1021  break;
1022  case 0x11:
1023  if (region->depth < 4) {
1024  av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
1025  return;
1026  }
1027 
1028  if (region->depth == 8)
1029  map_table = map4to8;
1030  else
1031  map_table = NULL;
1032 
1033  x_pos = dvbsub_read_4bit_string(avctx, pbuf + (y_pos * region->width),
1034  region->width, &buf, buf_end - buf,
1035  non_mod, map_table, x_pos);
1036  break;
1037  case 0x12:
1038  if (region->depth < 8) {
1039  av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
1040  return;
1041  }
1042 
1043  x_pos = dvbsub_read_8bit_string(avctx, pbuf + (y_pos * region->width),
1044  region->width, &buf, buf_end - buf,
1045  non_mod, NULL, x_pos);
1046  break;
1047 
1048  case 0x20:
1049  map2to4[0] = (*buf) >> 4;
1050  map2to4[1] = (*buf++) & 0xf;
1051  map2to4[2] = (*buf) >> 4;
1052  map2to4[3] = (*buf++) & 0xf;
1053  break;
1054  case 0x21:
1055  for (i = 0; i < 4; i++)
1056  map2to8[i] = *buf++;
1057  break;
1058  case 0x22:
1059  for (i = 0; i < 16; i++)
1060  map4to8[i] = *buf++;
1061  break;
1062 
1063  case 0xf0:
1064  x_pos = display->x_pos;
1065  y_pos += 2;
1066  break;
1067  default:
1068  av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
1069  }
1070  }
1071 
1072 }
1073 
1075  const uint8_t *buf, int buf_size)
1076 {
1077  DVBSubContext *ctx = avctx->priv_data;
1078 
1079  const uint8_t *buf_end = buf + buf_size;
1080  int object_id;
1081  DVBSubObject *object;
1082  DVBSubObjectDisplay *display;
1083  int top_field_len, bottom_field_len;
1084 
1085  int coding_method, non_modifying_color;
1086 
1087  object_id = AV_RB16(buf);
1088  buf += 2;
1089 
1090  object = get_object(ctx, object_id);
1091 
1092  if (!object)
1093  return AVERROR_INVALIDDATA;
1094 
1095  coding_method = ((*buf) >> 2) & 3;
1096  non_modifying_color = ((*buf++) >> 1) & 1;
1097 
1098  if (coding_method == 0) {
1099  top_field_len = AV_RB16(buf);
1100  buf += 2;
1101  bottom_field_len = AV_RB16(buf);
1102  buf += 2;
1103 
1104  if (buf + top_field_len + bottom_field_len > buf_end) {
1105  av_log(avctx, AV_LOG_ERROR, "Field data size %d+%d too large\n", top_field_len, bottom_field_len);
1106  return AVERROR_INVALIDDATA;
1107  }
1108 
1109  for (display = object->display_list; display; display = display->object_list_next) {
1110  const uint8_t *block = buf;
1111  int bfl = bottom_field_len;
1112 
1113  dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
1114  non_modifying_color);
1115 
1116  if (bottom_field_len > 0)
1117  block = buf + top_field_len;
1118  else
1119  bfl = top_field_len;
1120 
1121  dvbsub_parse_pixel_data_block(avctx, display, block, bfl, 1,
1122  non_modifying_color);
1123  }
1124 
1125 /* } else if (coding_method == 1) {*/
1126 
1127  } else {
1128  av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
1129  }
1130 
1131  return 0;
1132 }
1133 
1135  const uint8_t *buf, int buf_size)
1136 {
1137  DVBSubContext *ctx = avctx->priv_data;
1138 
1139  const uint8_t *buf_end = buf + buf_size;
1140  int i, clut_id;
1141  int version;
1142  DVBSubCLUT *clut;
1143  int entry_id, depth , full_range;
1144  int y, cr, cb, alpha;
1145  int r, g, b, r_add, g_add, b_add;
1146 
1147  ff_dlog(avctx, "DVB clut packet:\n");
1148 
1149  for (i=0; i < buf_size; i++) {
1150  ff_dlog(avctx, "%02x ", buf[i]);
1151  if (i % 16 == 15)
1152  ff_dlog(avctx, "\n");
1153  }
1154 
1155  if (i % 16)
1156  ff_dlog(avctx, "\n");
1157 
1158  clut_id = *buf++;
1159  version = ((*buf)>>4)&15;
1160  buf += 1;
1161 
1162  clut = get_clut(ctx, clut_id);
1163 
1164  if (!clut) {
1165  clut = av_malloc(sizeof(DVBSubCLUT));
1166  if (!clut)
1167  return AVERROR(ENOMEM);
1168 
1169  memcpy(clut, &default_clut, sizeof(DVBSubCLUT));
1170 
1171  clut->id = clut_id;
1172  clut->version = -1;
1173 
1174  clut->next = ctx->clut_list;
1175  ctx->clut_list = clut;
1176  }
1177 
1178  if (clut->version != version) {
1179 
1180  clut->version = version;
1181 
1182  while (buf + 4 < buf_end) {
1183  entry_id = *buf++;
1184 
1185  depth = (*buf) & 0xe0;
1186 
1187  if (depth == 0) {
1188  av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
1189  }
1190 
1191  full_range = (*buf++) & 1;
1192 
1193  if (full_range) {
1194  y = *buf++;
1195  cr = *buf++;
1196  cb = *buf++;
1197  alpha = *buf++;
1198  } else {
1199  y = buf[0] & 0xfc;
1200  cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
1201  cb = (buf[1] << 2) & 0xf0;
1202  alpha = (buf[1] << 6) & 0xc0;
1203 
1204  buf += 2;
1205  }
1206 
1207  if (y == 0)
1208  alpha = 0xff;
1209 
1210  YUV_TO_RGB1_CCIR(cb, cr);
1211  YUV_TO_RGB2_CCIR(r, g, b, y);
1212 
1213  ff_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
1214  if (!!(depth & 0x80) + !!(depth & 0x40) + !!(depth & 0x20) > 1) {
1215  ff_dlog(avctx, "More than one bit level marked: %x\n", depth);
1217  return AVERROR_INVALIDDATA;
1218  }
1219 
1220  if (depth & 0x80)
1221  clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
1222  else if (depth & 0x40)
1223  clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
1224  else if (depth & 0x20)
1225  clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
1226  }
1227  }
1228 
1229  return 0;
1230 }
1231 
1232 
1234  const uint8_t *buf, int buf_size)
1235 {
1236  DVBSubContext *ctx = avctx->priv_data;
1237 
1238  const uint8_t *buf_end = buf + buf_size;
1239  int region_id, object_id;
1240  int av_unused version;
1241  DVBSubRegion *region;
1242  DVBSubObject *object;
1243  DVBSubObjectDisplay *display;
1244  int fill;
1245 
1246  if (buf_size < 10)
1247  return AVERROR_INVALIDDATA;
1248 
1249  region_id = *buf++;
1250 
1251  region = get_region(ctx, region_id);
1252 
1253  if (!region) {
1254  region = av_mallocz(sizeof(DVBSubRegion));
1255  if (!region)
1256  return AVERROR(ENOMEM);
1257 
1258  region->id = region_id;
1259  region->version = -1;
1260 
1261  region->next = ctx->region_list;
1262  ctx->region_list = region;
1263  }
1264 
1265  version = ((*buf)>>4) & 15;
1266  fill = ((*buf++) >> 3) & 1;
1267 
1268  region->width = AV_RB16(buf);
1269  buf += 2;
1270  region->height = AV_RB16(buf);
1271  buf += 2;
1272 
1273  if (region->width * region->height != region->buf_size) {
1274  av_free(region->pbuf);
1275 
1276  region->buf_size = region->width * region->height;
1277 
1278  region->pbuf = av_malloc(region->buf_size);
1279  if (!region->pbuf) {
1280  region->buf_size =
1281  region->width =
1282  region->height = 0;
1283  return AVERROR(ENOMEM);
1284  }
1285 
1286  fill = 1;
1287  region->dirty = 0;
1288  }
1289 
1290  region->depth = 1 << (((*buf++) >> 2) & 7);
1291  if(region->depth<2 || region->depth>8){
1292  av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth);
1293  region->depth= 4;
1294  }
1295  region->clut = *buf++;
1296 
1297  if (region->depth == 8) {
1298  region->bgcolor = *buf++;
1299  buf += 1;
1300  } else {
1301  buf += 1;
1302 
1303  if (region->depth == 4)
1304  region->bgcolor = (((*buf++) >> 4) & 15);
1305  else
1306  region->bgcolor = (((*buf++) >> 2) & 3);
1307  }
1308 
1309  ff_dlog(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
1310 
1311  if (fill) {
1312  memset(region->pbuf, region->bgcolor, region->buf_size);
1313  ff_dlog(avctx, "Fill region (%d)\n", region->bgcolor);
1314  }
1315 
1316  delete_region_display_list(ctx, region);
1317 
1318  while (buf + 5 < buf_end) {
1319  object_id = AV_RB16(buf);
1320  buf += 2;
1321 
1322  object = get_object(ctx, object_id);
1323 
1324  if (!object) {
1325  object = av_mallocz(sizeof(DVBSubObject));
1326  if (!object)
1327  return AVERROR(ENOMEM);
1328 
1329  object->id = object_id;
1330  object->next = ctx->object_list;
1331  ctx->object_list = object;
1332  }
1333 
1334  object->type = (*buf) >> 6;
1335 
1336  display = av_mallocz(sizeof(DVBSubObjectDisplay));
1337  if (!display)
1338  return AVERROR(ENOMEM);
1339 
1340  display->object_id = object_id;
1341  display->region_id = region_id;
1342 
1343  display->x_pos = AV_RB16(buf) & 0xfff;
1344  buf += 2;
1345  display->y_pos = AV_RB16(buf) & 0xfff;
1346  buf += 2;
1347 
1348  if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
1349  display->fgcolor = *buf++;
1350  display->bgcolor = *buf++;
1351  }
1352 
1353  display->region_list_next = region->display_list;
1354  region->display_list = display;
1355 
1356  display->object_list_next = object->display_list;
1357  object->display_list = display;
1358  }
1359 
1360  return 0;
1361 }
1362 
1364  const uint8_t *buf, int buf_size, AVSubtitle *sub, int *got_output)
1365 {
1366  DVBSubContext *ctx = avctx->priv_data;
1367  DVBSubRegionDisplay *display;
1368  DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
1369 
1370  const uint8_t *buf_end = buf + buf_size;
1371  int region_id;
1372  int page_state;
1373  int timeout;
1374  int version;
1375 
1376  if (buf_size < 1)
1377  return AVERROR_INVALIDDATA;
1378 
1379  timeout = *buf++;
1380  version = ((*buf)>>4) & 15;
1381  page_state = ((*buf++) >> 2) & 3;
1382 
1383  if (ctx->version == version) {
1384  return 0;
1385  }
1386 
1387  ctx->time_out = timeout;
1388  ctx->version = version;
1389 
1390  ff_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
1391 
1392  if(ctx->compute_edt == 1)
1393  save_subtitle_set(avctx, sub, got_output);
1394 
1395  if (page_state == 1 || page_state == 2) {
1396  delete_regions(ctx);
1397  delete_objects(ctx);
1398  delete_cluts(ctx);
1399  }
1400 
1401  tmp_display_list = ctx->display_list;
1402  ctx->display_list = NULL;
1403 
1404  while (buf + 5 < buf_end) {
1405  region_id = *buf++;
1406  buf += 1;
1407 
1408  display = tmp_display_list;
1409  tmp_ptr = &tmp_display_list;
1410 
1411  while (display && display->region_id != region_id) {
1412  tmp_ptr = &display->next;
1413  display = display->next;
1414  }
1415 
1416  if (!display) {
1417  display = av_mallocz(sizeof(DVBSubRegionDisplay));
1418  if (!display)
1419  return AVERROR(ENOMEM);
1420  }
1421 
1422  display->region_id = region_id;
1423 
1424  display->x_pos = AV_RB16(buf);
1425  buf += 2;
1426  display->y_pos = AV_RB16(buf);
1427  buf += 2;
1428 
1429  *tmp_ptr = display->next;
1430 
1431  display->next = ctx->display_list;
1432  ctx->display_list = display;
1433 
1434  ff_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
1435  }
1436 
1437  while (tmp_display_list) {
1438  display = tmp_display_list;
1439 
1440  tmp_display_list = display->next;
1441 
1442  av_freep(&display);
1443  }
1444 
1445  return 0;
1446 }
1447 
1448 
1449 #ifdef DEBUG
1450 static int save_display_set(DVBSubContext *ctx)
1451 {
1452  DVBSubRegion *region;
1453  DVBSubRegionDisplay *display;
1454  DVBSubCLUT *clut;
1455  uint32_t *clut_table;
1456  int x_pos, y_pos, width, height;
1457  int x, y, y_off, x_off;
1458  uint32_t *pbuf;
1459  char filename[32];
1460  static int fileno_index = 0;
1461 
1462  x_pos = -1;
1463  y_pos = -1;
1464  width = 0;
1465  height = 0;
1466 
1467  for (display = ctx->display_list; display; display = display->next) {
1468  region = get_region(ctx, display->region_id);
1469 
1470  if (!region)
1471  return -1;
1472 
1473  if (x_pos == -1) {
1474  x_pos = display->x_pos;
1475  y_pos = display->y_pos;
1476  width = region->width;
1477  height = region->height;
1478  } else {
1479  if (display->x_pos < x_pos) {
1480  width += (x_pos - display->x_pos);
1481  x_pos = display->x_pos;
1482  }
1483 
1484  if (display->y_pos < y_pos) {
1485  height += (y_pos - display->y_pos);
1486  y_pos = display->y_pos;
1487  }
1488 
1489  if (display->x_pos + region->width > x_pos + width) {
1490  width = display->x_pos + region->width - x_pos;
1491  }
1492 
1493  if (display->y_pos + region->height > y_pos + height) {
1494  height = display->y_pos + region->height - y_pos;
1495  }
1496  }
1497  }
1498 
1499  if (x_pos >= 0) {
1500 
1501  pbuf = av_malloc(width * height * 4);
1502  if (!pbuf)
1503  return -1;
1504 
1505  for (display = ctx->display_list; display; display = display->next) {
1506  region = get_region(ctx, display->region_id);
1507 
1508  if (!region)
1509  return -1;
1510 
1511  x_off = display->x_pos - x_pos;
1512  y_off = display->y_pos - y_pos;
1513 
1514  clut = get_clut(ctx, region->clut);
1515 
1516  if (!clut)
1517  clut = &default_clut;
1518 
1519  switch (region->depth) {
1520  case 2:
1521  clut_table = clut->clut4;
1522  break;
1523  case 8:
1524  clut_table = clut->clut256;
1525  break;
1526  case 4:
1527  default:
1528  clut_table = clut->clut16;
1529  break;
1530  }
1531 
1532  for (y = 0; y < region->height; y++) {
1533  for (x = 0; x < region->width; x++) {
1534  pbuf[((y + y_off) * width) + x_off + x] =
1535  clut_table[region->pbuf[y * region->width + x]];
1536  }
1537  }
1538 
1539  }
1540 
1541  snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index);
1542 
1543  png_save2(filename, pbuf, width, height);
1544 
1545  av_freep(&pbuf);
1546  }
1547 
1548  fileno_index++;
1549  return 0;
1550 }
1551 #endif
1552 
1554  const uint8_t *buf,
1555  int buf_size)
1556 {
1557  DVBSubContext *ctx = avctx->priv_data;
1558  DVBSubDisplayDefinition *display_def = ctx->display_definition;
1559  int dds_version, info_byte;
1560 
1561  if (buf_size < 5)
1562  return AVERROR_INVALIDDATA;
1563 
1564  info_byte = bytestream_get_byte(&buf);
1565  dds_version = info_byte >> 4;
1566  if (display_def && display_def->version == dds_version)
1567  return 0; // already have this display definition version
1568 
1569  if (!display_def) {
1570  display_def = av_mallocz(sizeof(*display_def));
1571  if (!display_def)
1572  return AVERROR(ENOMEM);
1573  ctx->display_definition = display_def;
1574  }
1575 
1576  display_def->version = dds_version;
1577  display_def->x = 0;
1578  display_def->y = 0;
1579  display_def->width = bytestream_get_be16(&buf) + 1;
1580  display_def->height = bytestream_get_be16(&buf) + 1;
1581  if (!avctx->width || !avctx->height) {
1582  avctx->width = display_def->width;
1583  avctx->height = display_def->height;
1584  }
1585 
1586  if (info_byte & 1<<3) { // display_window_flag
1587  if (buf_size < 13)
1588  return AVERROR_INVALIDDATA;
1589 
1590  display_def->x = bytestream_get_be16(&buf);
1591  display_def->width = bytestream_get_be16(&buf) - display_def->x + 1;
1592  display_def->y = bytestream_get_be16(&buf);
1593  display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;
1594  }
1595 
1596  return 0;
1597 }
1598 
1600  int buf_size, AVSubtitle *sub,int *got_output)
1601 {
1602  DVBSubContext *ctx = avctx->priv_data;
1603 
1604  if(ctx->compute_edt == 0)
1605  save_subtitle_set(avctx, sub, got_output);
1606 #ifdef DEBUG
1607  save_display_set(ctx);
1608 #endif
1609  return 0;
1610 }
1611 
1612 static int dvbsub_decode(AVCodecContext *avctx,
1613  void *data, int *data_size,
1614  AVPacket *avpkt)
1615 {
1616  const uint8_t *buf = avpkt->data;
1617  int buf_size = avpkt->size;
1618  DVBSubContext *ctx = avctx->priv_data;
1619  AVSubtitle *sub = data;
1620  const uint8_t *p, *p_end;
1621  int segment_type;
1622  int page_id;
1623  int segment_length;
1624  int i;
1625  int ret = 0;
1626  int got_segment = 0;
1627  int got_dds = 0;
1628 
1629  ff_dlog(avctx, "DVB sub packet:\n");
1630 
1631  for (i=0; i < buf_size; i++) {
1632  ff_dlog(avctx, "%02x ", buf[i]);
1633  if (i % 16 == 15)
1634  ff_dlog(avctx, "\n");
1635  }
1636 
1637  if (i % 16)
1638  ff_dlog(avctx, "\n");
1639 
1640  if (buf_size <= 6 || *buf != 0x0f) {
1641  ff_dlog(avctx, "incomplete or broken packet");
1642  return AVERROR_INVALIDDATA;
1643  }
1644 
1645  p = buf;
1646  p_end = buf + buf_size;
1647 
1648  while (p_end - p >= 6 && *p == 0x0f) {
1649  p += 1;
1650  segment_type = *p++;
1651  page_id = AV_RB16(p);
1652  p += 2;
1653  segment_length = AV_RB16(p);
1654  p += 2;
1655 
1656  if (avctx->debug & FF_DEBUG_STARTCODE) {
1657  av_log(avctx, AV_LOG_DEBUG, "segment_type:%d page_id:%d segment_length:%d\n", segment_type, page_id, segment_length);
1658  }
1659 
1660  if (p_end - p < segment_length) {
1661  ff_dlog(avctx, "incomplete or broken packet");
1662  ret = -1;
1663  goto end;
1664  }
1665 
1666  if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||
1667  ctx->composition_id == -1 || ctx->ancillary_id == -1) {
1668  int ret = 0;
1669  switch (segment_type) {
1670  case DVBSUB_PAGE_SEGMENT:
1671  ret = dvbsub_parse_page_segment(avctx, p, segment_length, sub, data_size);
1672  got_segment |= 1;
1673  break;
1674  case DVBSUB_REGION_SEGMENT:
1675  ret = dvbsub_parse_region_segment(avctx, p, segment_length);
1676  got_segment |= 2;
1677  break;
1678  case DVBSUB_CLUT_SEGMENT:
1679  ret = dvbsub_parse_clut_segment(avctx, p, segment_length);
1680  if (ret < 0) goto end;
1681  got_segment |= 4;
1682  break;
1683  case DVBSUB_OBJECT_SEGMENT:
1684  ret = dvbsub_parse_object_segment(avctx, p, segment_length);
1685  got_segment |= 8;
1686  break;
1689  segment_length);
1690  got_dds = 1;
1691  break;
1693  ret = dvbsub_display_end_segment(avctx, p, segment_length, sub, data_size);
1694  if (got_segment == 15 && !got_dds && !avctx->width && !avctx->height) {
1695  // Default from ETSI EN 300 743 V1.3.1 (7.2.1)
1696  avctx->width = 720;
1697  avctx->height = 576;
1698  }
1699  got_segment |= 16;
1700  break;
1701  default:
1702  ff_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",
1703  segment_type, page_id, segment_length);
1704  break;
1705  }
1706  if (ret < 0)
1707  goto end;
1708  }
1709 
1710  p += segment_length;
1711  }
1712  // Some streams do not send a display segment but if we have all the other
1713  // segments then we need no further data.
1714  if (got_segment == 15) {
1715  av_log(avctx, AV_LOG_DEBUG, "Missing display_end_segment, emulating\n");
1716  dvbsub_display_end_segment(avctx, p, 0, sub, data_size);
1717  }
1718 
1719 end:
1720  if(ret < 0) {
1721  *data_size = 0;
1722  avsubtitle_free(sub);
1723  return ret;
1724  } else {
1725  if(ctx->compute_edt == 1 )
1726  FFSWAP(int64_t, ctx->prev_start, sub->pts);
1727  }
1728 
1729  return p - buf;
1730 }
1731 
1732 #define DS AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_SUBTITLE_PARAM
1733 static const AVOption options[] = {
1734  {"compute_edt", "compute end of time using pts or timeout", offsetof(DVBSubContext, compute_edt), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DS},
1735  {"compute_clut", "compute clut when not available(-1) or always(1) or never(0)", offsetof(DVBSubContext, compute_clut), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, DS},
1736  {"dvb_substream", "", offsetof(DVBSubContext, substream), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 63, DS},
1737  {NULL}
1738 };
1739 static const AVClass dvbsubdec_class = {
1740  .class_name = "DVB Sub Decoder",
1741  .item_name = av_default_item_name,
1742  .option = options,
1743  .version = LIBAVUTIL_VERSION_INT,
1744 };
1745 
1747  .name = "dvbsub",
1748  .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),
1749  .type = AVMEDIA_TYPE_SUBTITLE,
1751  .priv_data_size = sizeof(DVBSubContext),
1753  .close = dvbsub_close_decoder,
1754  .decode = dvbsub_decode,
1755  .priv_class = &dvbsubdec_class,
1756 };
int version
Definition: dvbsubdec.c:157
#define NULL
Definition: coverity.c:32
static DVBSubCLUT * get_clut(DVBSubContext *ctx, int clut_id)
Definition: dvbsubdec.c:263
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static int dvbsub_read_8bit_string(AVCodecContext *avctx, uint8_t *destbuf, int dbuf_len, const uint8_t **srcbuf, int buf_size, int non_mod, uint8_t *map_table, int x_pos)
Definition: dvbsubdec.c:710
static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display, const uint8_t *buf, int buf_size, int top_bottom, int non_mod)
Definition: dvbsubdec.c:958
static DVBSubRegion * get_region(DVBSubContext *ctx, int region_id)
Definition: dvbsubdec.c:274
AVOption.
Definition: opt.h:245
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
DVBSubRegionDisplay * display_list
Definition: dvbsubdec.c:247
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:70
#define YUV_TO_RGB1_CCIR(cb1, cr1)
Definition: colorspace.h:34
const char * g
Definition: vf_curves.c:108
int64_t prev_start
Definition: dvbsubdec.c:242
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int size
Definition: avcodec.h:1589
const char * b
Definition: vf_curves.c:109
#define V(x, y)
Various defines for YUV<->RGB conversion.
unsigned num_rects
Definition: avcodec.h:3912
#define RGBA(r, g, b, a)
Definition: dvbsubdec.c:153
int version
Definition: avisynth_c.h:629
static int dvbsub_parse_page_segment(AVCodecContext *avctx, const uint8_t *buf, int buf_size, AVSubtitle *sub, int *got_output)
Definition: dvbsubdec.c:1363
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
AVCodec.
Definition: avcodec.h:3552
static int16_t block[64]
Definition: dct.c:113
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:97
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
uint8_t bits
Definition: crc.c:296
uint8_t
#define av_cold
Definition: attributes.h:82
#define av_malloc(s)
static int dvbsub_read_4bit_string(AVCodecContext *avctx, uint8_t *destbuf, int dbuf_len, const uint8_t **srcbuf, int buf_size, int non_mod, uint8_t *map_table, int x_pos)
Definition: dvbsubdec.c:587
static void delete_cluts(DVBSubContext *ctx)
Definition: dvbsubdec.c:331
AVOptions.
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
int y
Definition: f_ebur128.c:91
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1772
static const AVClass dvbsubdec_class
Definition: dvbsubdec.c:1739
#define height
uint8_t * data
Definition: avcodec.h:1588
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:199
#define ff_dlog(a,...)
bitstream reader API header.
DVBSubRegion * region_list
Definition: dvbsubdec.c:243
#define av_log(a,...)
static void delete_regions(DVBSubContext *ctx)
Definition: dvbsubdec.c:353
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
#define DVBSUB_DISPLAYDEFINITION_SEGMENT
Definition: dvbsubdec.c:33
#define L(x, y)
struct DVBSubRegion * next
Definition: dvbsubdec.c:219
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
av_default_item_name
#define AVERROR(e)
Definition: error.h:43
int compute_clut
Definition: dvbsubdec.c:240
#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:107
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
static DVBSubCLUT default_clut
Definition: dvbsubdec.c:166
static int dvbsub_parse_display_definition_segment(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: dvbsubdec.c:1553
const char * name
Name of the codec implementation.
Definition: avcodec.h:3559
GLsizei count
Definition: opengl_enc.c:109
#define fail()
Definition: checkasm.h:82
int depth
Definition: v4l.c:62
uint32_t end_display_time
Definition: avcodec.h:3911
int64_t pts
Same as packet pts, in AV_TIME_BASE.
Definition: avcodec.h:3914
struct DVBSubObject * next
Definition: dvbsubdec.c:190
AVCodec ff_dvbsub_decoder
Definition: dvbsubdec.c:1746
A bitmap, pict will be set.
Definition: avcodec.h:3856
int linesize[4]
Definition: avcodec.h:3892
int composition_id
Definition: dvbsubdec.c:233
DVBSubObjectDisplay * display_list
Definition: dvbsubdec.c:217
struct DVBSubObjectDisplay * region_list_next
Definition: dvbsubdec.c:178
#define width
int width
picture width / height.
Definition: avcodec.h:1844
static int dvbsub_parse_clut_segment(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: dvbsubdec.c:1134
AVFormatContext * ctx
Definition: movenc.c:48
struct DVBSubCLUT * next
Definition: dvbsubdec.c:163
static int save_subtitle_set(AVCodecContext *avctx, AVSubtitle *sub, int *got_output)
Definition: dvbsubdec.c:821
uint32_t clut16[16]
Definition: dvbsubdec.c:160
DVBSubObjectDisplay * display_list
Definition: dvbsubdec.c:188
static void delete_objects(DVBSubContext *ctx)
Definition: dvbsubdec.c:342
DVBSubDisplayDefinition * display_definition
Definition: dvbsubdec.c:248
uint8_t * data[4]
data+linesize for the bitmap of this subtitle.
Definition: avcodec.h:3891
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#define DS
Definition: dvbsubdec.c:1732
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
#define DVBSUB_CLUT_SEGMENT
Definition: dvbsubdec.c:31
Libavcodec external API header.
uint8_t * pbuf
Definition: dvbsubdec.c:213
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:252
uint32_t clut256[256]
Definition: dvbsubdec.c:161
int debug
debug
Definition: avcodec.h:2896
main external API structure.
Definition: avcodec.h:1657
static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf, int buf_size, AVSubtitle *sub, int *got_output)
Definition: dvbsubdec.c:1599
static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
Definition: vf_drawtext.c:767
void avsubtitle_free(AVSubtitle *sub)
Free all allocated data in the given subtitle struct.
Definition: utils.c:2694
int x
Definition: f_ebur128.c:91
DVBSubCLUT * clut_list
Definition: dvbsubdec.c:244
static DVBSubObject * get_object(DVBSubContext *ctx, int object_id)
Definition: dvbsubdec.c:252
void * buf
Definition: avisynth_c.h:553
int extradata_size
Definition: avcodec.h:1773
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:299
static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)
Definition: dvbsubdec.c:285
Describe the class of an AVClass context structure.
Definition: log.h:67
Definition: f_ebur128.c:91
#define DVBSUB_DISPLAY_SEGMENT
Definition: dvbsubdec.c:34
struct DVBSubRegionDisplay * next
Definition: dvbsubdec.c:199
#define FF_COMPLIANCE_NORMAL
Definition: avcodec.h:2877
rational number numerator/denominator
Definition: rational.h:43
#define YUV_TO_RGB2_CCIR(r, g, b, y1)
Definition: colorspace.h:55
struct DVBSubObjectDisplay * object_list_next
Definition: dvbsubdec.c:179
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:406
int h
Definition: f_ebur128.c:91
#define snprintf
Definition: snprintf.h:34
#define DVBSUB_PAGE_SEGMENT
Definition: dvbsubdec.c:29
uint32_t clut4[4]
Definition: dvbsubdec.c:159
static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)
Definition: dvbsubdec.c:367
static const AVOption options[]
Definition: dvbsubdec.c:1733
static void compute_default_clut(AVSubtitleRect *rect, int w, int h)
Definition: dvbsubdec.c:764
#define DVBSUB_REGION_SEGMENT
Definition: dvbsubdec.c:30
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.
int ancillary_id
Definition: dvbsubdec.c:234
#define AV_WN32(p, v)
Definition: intreadwrite.h:376
int w
Definition: f_ebur128.c:91
static int dvbsub_decode(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
Definition: dvbsubdec.c:1612
void * priv_data
Definition: avcodec.h:1699
#define av_free(p)
#define FF_DEBUG_STARTCODE
Definition: avcodec.h:2910
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:81
static int dvbsub_parse_object_segment(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: dvbsubdec.c:1074
static void * av_mallocz_array(size_t nmemb, size_t size)
Definition: mem.h:229
DVBSubObject * object_list
Definition: dvbsubdec.c:245
static int dvbsub_read_2bit_string(AVCodecContext *avctx, uint8_t *destbuf, int dbuf_len, const uint8_t **srcbuf, int buf_size, int non_mod, uint8_t *map_table, int x_pos)
Definition: dvbsubdec.c:479
#define av_freep(p)
static int dvbsub_parse_region_segment(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: dvbsubdec.c:1233
#define FFSWAP(type, a, b)
Definition: common.h:99
int compute_edt
if 1 end display time calculated using pts if 0 (Default) calculated using time out ...
Definition: dvbsubdec.c:238
#define DVBSUB_OBJECT_SEGMENT
Definition: dvbsubdec.c:32
static double cr(void *priv, double x, double y)
Definition: vf_geq.c:98
static av_cold int dvbsub_close_decoder(AVCodecContext *avctx)
Definition: dvbsubdec.c:456
This structure stores compressed data.
Definition: avcodec.h:1565
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:252
int strict_std_compliance
strictly follow the standard (MPEG-4, ...).
Definition: avcodec.h:2874
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:240
#define av_unused
Definition: attributes.h:126