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dvbsubdec.c
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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 
331 static void delete_cluts(DVBSubContext *ctx)
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 
342 static void delete_objects(DVBSubContext *ctx)
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 
353 static void delete_regions(DVBSubContext *ctx)
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(AVPicture *frame, 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) frame->data[0][(x) + (y)*frame->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[ frame->data[0][(x) + (y)*frame->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 = frame->data[0][x + y*frame->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(frame->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->pict.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->pict.data[1] = av_mallocz(AVPALETTE_SIZE);
908  if (!rect->pict.data[1]) {
909  ret = AVERROR(ENOMEM);
910  goto fail;
911  }
912  memcpy(rect->pict.data[1], clut_table, (1 << region->depth) * sizeof(uint32_t));
913 
914  rect->pict.data[0] = av_malloc(region->buf_size);
915  if (!rect->pict.data[0]) {
916  ret = AVERROR(ENOMEM);
917  goto fail;
918  }
919 
920  memcpy(rect->pict.data[0], region->pbuf, region->buf_size);
921 
922  if ((clut == &default_clut && ctx->compute_clut == -1) || ctx->compute_clut == 1)
923  compute_default_clut(&rect->pict, rect->w, rect->h);
924 
925  i++;
926  }
927  }
928 
929  return 0;
930 fail:
931  if (sub->rects) {
932  for(i=0; i<sub->num_rects; i++) {
933  rect = sub->rects[i];
934  if (rect) {
935  av_freep(&rect->pict.data[0]);
936  av_freep(&rect->pict.data[1]);
937  }
938  av_freep(&sub->rects[i]);
939  }
940  av_freep(&sub->rects);
941  }
942  sub->num_rects = 0;
943  return ret;
944 }
945 
947  const uint8_t *buf, int buf_size, int top_bottom, int non_mod)
948 {
949  DVBSubContext *ctx = avctx->priv_data;
950 
951  DVBSubRegion *region = get_region(ctx, display->region_id);
952  const uint8_t *buf_end = buf + buf_size;
953  uint8_t *pbuf;
954  int x_pos, y_pos;
955  int i;
956 
957  uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf};
958  uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
959  uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
960  0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
961  uint8_t *map_table;
962 
963 #if 0
964  ff_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size,
965  top_bottom ? "bottom" : "top");
966 
967  for (i = 0; i < buf_size; i++) {
968  if (i % 16 == 0)
969  ff_dlog(avctx, "0x%8p: ", buf+i);
970 
971  ff_dlog(avctx, "%02x ", buf[i]);
972  if (i % 16 == 15)
973  ff_dlog(avctx, "\n");
974  }
975 
976  if (i % 16)
977  ff_dlog(avctx, "\n");
978 #endif
979 
980  if (!region)
981  return;
982 
983  pbuf = region->pbuf;
984  region->dirty = 1;
985 
986  x_pos = display->x_pos;
987  y_pos = display->y_pos;
988 
989  y_pos += top_bottom;
990 
991  while (buf < buf_end) {
992  if ((*buf!=0xf0 && x_pos >= region->width) || y_pos >= region->height) {
993  av_log(avctx, AV_LOG_ERROR, "Invalid object location! %d-%d %d-%d %02x\n", x_pos, region->width, y_pos, region->height, *buf);
994  return;
995  }
996 
997  switch (*buf++) {
998  case 0x10:
999  if (region->depth == 8)
1000  map_table = map2to8;
1001  else if (region->depth == 4)
1002  map_table = map2to4;
1003  else
1004  map_table = NULL;
1005 
1006  x_pos = dvbsub_read_2bit_string(avctx, pbuf + (y_pos * region->width),
1007  region->width, &buf, buf_end - buf,
1008  non_mod, map_table, x_pos);
1009  break;
1010  case 0x11:
1011  if (region->depth < 4) {
1012  av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
1013  return;
1014  }
1015 
1016  if (region->depth == 8)
1017  map_table = map4to8;
1018  else
1019  map_table = NULL;
1020 
1021  x_pos = dvbsub_read_4bit_string(avctx, pbuf + (y_pos * region->width),
1022  region->width, &buf, buf_end - buf,
1023  non_mod, map_table, x_pos);
1024  break;
1025  case 0x12:
1026  if (region->depth < 8) {
1027  av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
1028  return;
1029  }
1030 
1031  x_pos = dvbsub_read_8bit_string(avctx, pbuf + (y_pos * region->width),
1032  region->width, &buf, buf_end - buf,
1033  non_mod, NULL, x_pos);
1034  break;
1035 
1036  case 0x20:
1037  map2to4[0] = (*buf) >> 4;
1038  map2to4[1] = (*buf++) & 0xf;
1039  map2to4[2] = (*buf) >> 4;
1040  map2to4[3] = (*buf++) & 0xf;
1041  break;
1042  case 0x21:
1043  for (i = 0; i < 4; i++)
1044  map2to8[i] = *buf++;
1045  break;
1046  case 0x22:
1047  for (i = 0; i < 16; i++)
1048  map4to8[i] = *buf++;
1049  break;
1050 
1051  case 0xf0:
1052  x_pos = display->x_pos;
1053  y_pos += 2;
1054  break;
1055  default:
1056  av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
1057  }
1058  }
1059 
1060 }
1061 
1063  const uint8_t *buf, int buf_size)
1064 {
1065  DVBSubContext *ctx = avctx->priv_data;
1066 
1067  const uint8_t *buf_end = buf + buf_size;
1068  int object_id;
1069  DVBSubObject *object;
1070  DVBSubObjectDisplay *display;
1071  int top_field_len, bottom_field_len;
1072 
1073  int coding_method, non_modifying_color;
1074 
1075  object_id = AV_RB16(buf);
1076  buf += 2;
1077 
1078  object = get_object(ctx, object_id);
1079 
1080  if (!object)
1081  return AVERROR_INVALIDDATA;
1082 
1083  coding_method = ((*buf) >> 2) & 3;
1084  non_modifying_color = ((*buf++) >> 1) & 1;
1085 
1086  if (coding_method == 0) {
1087  top_field_len = AV_RB16(buf);
1088  buf += 2;
1089  bottom_field_len = AV_RB16(buf);
1090  buf += 2;
1091 
1092  if (buf + top_field_len + bottom_field_len > buf_end) {
1093  av_log(avctx, AV_LOG_ERROR, "Field data size %d+%d too large\n", top_field_len, bottom_field_len);
1094  return AVERROR_INVALIDDATA;
1095  }
1096 
1097  for (display = object->display_list; display; display = display->object_list_next) {
1098  const uint8_t *block = buf;
1099  int bfl = bottom_field_len;
1100 
1101  dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
1102  non_modifying_color);
1103 
1104  if (bottom_field_len > 0)
1105  block = buf + top_field_len;
1106  else
1107  bfl = top_field_len;
1108 
1109  dvbsub_parse_pixel_data_block(avctx, display, block, bfl, 1,
1110  non_modifying_color);
1111  }
1112 
1113 /* } else if (coding_method == 1) {*/
1114 
1115  } else {
1116  av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
1117  }
1118 
1119  return 0;
1120 }
1121 
1123  const uint8_t *buf, int buf_size)
1124 {
1125  DVBSubContext *ctx = avctx->priv_data;
1126 
1127  const uint8_t *buf_end = buf + buf_size;
1128  int i, clut_id;
1129  int version;
1130  DVBSubCLUT *clut;
1131  int entry_id, depth , full_range;
1132  int y, cr, cb, alpha;
1133  int r, g, b, r_add, g_add, b_add;
1134 
1135  ff_dlog(avctx, "DVB clut packet:\n");
1136 
1137  for (i=0; i < buf_size; i++) {
1138  ff_dlog(avctx, "%02x ", buf[i]);
1139  if (i % 16 == 15)
1140  ff_dlog(avctx, "\n");
1141  }
1142 
1143  if (i % 16)
1144  ff_dlog(avctx, "\n");
1145 
1146  clut_id = *buf++;
1147  version = ((*buf)>>4)&15;
1148  buf += 1;
1149 
1150  clut = get_clut(ctx, clut_id);
1151 
1152  if (!clut) {
1153  clut = av_malloc(sizeof(DVBSubCLUT));
1154  if (!clut)
1155  return AVERROR(ENOMEM);
1156 
1157  memcpy(clut, &default_clut, sizeof(DVBSubCLUT));
1158 
1159  clut->id = clut_id;
1160  clut->version = -1;
1161 
1162  clut->next = ctx->clut_list;
1163  ctx->clut_list = clut;
1164  }
1165 
1166  if (clut->version != version) {
1167 
1168  clut->version = version;
1169 
1170  while (buf + 4 < buf_end) {
1171  entry_id = *buf++;
1172 
1173  depth = (*buf) & 0xe0;
1174 
1175  if (depth == 0) {
1176  av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
1177  }
1178 
1179  full_range = (*buf++) & 1;
1180 
1181  if (full_range) {
1182  y = *buf++;
1183  cr = *buf++;
1184  cb = *buf++;
1185  alpha = *buf++;
1186  } else {
1187  y = buf[0] & 0xfc;
1188  cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
1189  cb = (buf[1] << 2) & 0xf0;
1190  alpha = (buf[1] << 6) & 0xc0;
1191 
1192  buf += 2;
1193  }
1194 
1195  if (y == 0)
1196  alpha = 0xff;
1197 
1198  YUV_TO_RGB1_CCIR(cb, cr);
1199  YUV_TO_RGB2_CCIR(r, g, b, y);
1200 
1201  ff_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
1202  if (!!(depth & 0x80) + !!(depth & 0x40) + !!(depth & 0x20) > 1) {
1203  ff_dlog(avctx, "More than one bit level marked: %x\n", depth);
1205  return AVERROR_INVALIDDATA;
1206  }
1207 
1208  if (depth & 0x80)
1209  clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
1210  else if (depth & 0x40)
1211  clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
1212  else if (depth & 0x20)
1213  clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
1214  }
1215  }
1216 
1217  return 0;
1218 }
1219 
1220 
1222  const uint8_t *buf, int buf_size)
1223 {
1224  DVBSubContext *ctx = avctx->priv_data;
1225 
1226  const uint8_t *buf_end = buf + buf_size;
1227  int region_id, object_id;
1228  int av_unused version;
1229  DVBSubRegion *region;
1230  DVBSubObject *object;
1231  DVBSubObjectDisplay *display;
1232  int fill;
1233 
1234  if (buf_size < 10)
1235  return AVERROR_INVALIDDATA;
1236 
1237  region_id = *buf++;
1238 
1239  region = get_region(ctx, region_id);
1240 
1241  if (!region) {
1242  region = av_mallocz(sizeof(DVBSubRegion));
1243  if (!region)
1244  return AVERROR(ENOMEM);
1245 
1246  region->id = region_id;
1247  region->version = -1;
1248 
1249  region->next = ctx->region_list;
1250  ctx->region_list = region;
1251  }
1252 
1253  version = ((*buf)>>4) & 15;
1254  fill = ((*buf++) >> 3) & 1;
1255 
1256  region->width = AV_RB16(buf);
1257  buf += 2;
1258  region->height = AV_RB16(buf);
1259  buf += 2;
1260 
1261  if (region->width * region->height != region->buf_size) {
1262  av_free(region->pbuf);
1263 
1264  region->buf_size = region->width * region->height;
1265 
1266  region->pbuf = av_malloc(region->buf_size);
1267  if (!region->pbuf) {
1268  region->buf_size =
1269  region->width =
1270  region->height = 0;
1271  return AVERROR(ENOMEM);
1272  }
1273 
1274  fill = 1;
1275  region->dirty = 0;
1276  }
1277 
1278  region->depth = 1 << (((*buf++) >> 2) & 7);
1279  if(region->depth<2 || region->depth>8){
1280  av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth);
1281  region->depth= 4;
1282  }
1283  region->clut = *buf++;
1284 
1285  if (region->depth == 8) {
1286  region->bgcolor = *buf++;
1287  buf += 1;
1288  } else {
1289  buf += 1;
1290 
1291  if (region->depth == 4)
1292  region->bgcolor = (((*buf++) >> 4) & 15);
1293  else
1294  region->bgcolor = (((*buf++) >> 2) & 3);
1295  }
1296 
1297  ff_dlog(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
1298 
1299  if (fill) {
1300  memset(region->pbuf, region->bgcolor, region->buf_size);
1301  ff_dlog(avctx, "Fill region (%d)\n", region->bgcolor);
1302  }
1303 
1304  delete_region_display_list(ctx, region);
1305 
1306  while (buf + 5 < buf_end) {
1307  object_id = AV_RB16(buf);
1308  buf += 2;
1309 
1310  object = get_object(ctx, object_id);
1311 
1312  if (!object) {
1313  object = av_mallocz(sizeof(DVBSubObject));
1314  if (!object)
1315  return AVERROR(ENOMEM);
1316 
1317  object->id = object_id;
1318  object->next = ctx->object_list;
1319  ctx->object_list = object;
1320  }
1321 
1322  object->type = (*buf) >> 6;
1323 
1324  display = av_mallocz(sizeof(DVBSubObjectDisplay));
1325  if (!display)
1326  return AVERROR(ENOMEM);
1327 
1328  display->object_id = object_id;
1329  display->region_id = region_id;
1330 
1331  display->x_pos = AV_RB16(buf) & 0xfff;
1332  buf += 2;
1333  display->y_pos = AV_RB16(buf) & 0xfff;
1334  buf += 2;
1335 
1336  if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
1337  display->fgcolor = *buf++;
1338  display->bgcolor = *buf++;
1339  }
1340 
1341  display->region_list_next = region->display_list;
1342  region->display_list = display;
1343 
1344  display->object_list_next = object->display_list;
1345  object->display_list = display;
1346  }
1347 
1348  return 0;
1349 }
1350 
1352  const uint8_t *buf, int buf_size, AVSubtitle *sub, int *got_output)
1353 {
1354  DVBSubContext *ctx = avctx->priv_data;
1355  DVBSubRegionDisplay *display;
1356  DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
1357 
1358  const uint8_t *buf_end = buf + buf_size;
1359  int region_id;
1360  int page_state;
1361  int timeout;
1362  int version;
1363 
1364  if (buf_size < 1)
1365  return AVERROR_INVALIDDATA;
1366 
1367  timeout = *buf++;
1368  version = ((*buf)>>4) & 15;
1369  page_state = ((*buf++) >> 2) & 3;
1370 
1371  if (ctx->version == version) {
1372  return 0;
1373  }
1374 
1375  ctx->time_out = timeout;
1376  ctx->version = version;
1377 
1378  ff_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
1379 
1380  if(ctx->compute_edt == 1)
1381  save_subtitle_set(avctx, sub, got_output);
1382 
1383  if (page_state == 1 || page_state == 2) {
1384  delete_regions(ctx);
1385  delete_objects(ctx);
1386  delete_cluts(ctx);
1387  }
1388 
1389  tmp_display_list = ctx->display_list;
1390  ctx->display_list = NULL;
1391 
1392  while (buf + 5 < buf_end) {
1393  region_id = *buf++;
1394  buf += 1;
1395 
1396  display = tmp_display_list;
1397  tmp_ptr = &tmp_display_list;
1398 
1399  while (display && display->region_id != region_id) {
1400  tmp_ptr = &display->next;
1401  display = display->next;
1402  }
1403 
1404  if (!display) {
1405  display = av_mallocz(sizeof(DVBSubRegionDisplay));
1406  if (!display)
1407  return AVERROR(ENOMEM);
1408  }
1409 
1410  display->region_id = region_id;
1411 
1412  display->x_pos = AV_RB16(buf);
1413  buf += 2;
1414  display->y_pos = AV_RB16(buf);
1415  buf += 2;
1416 
1417  *tmp_ptr = display->next;
1418 
1419  display->next = ctx->display_list;
1420  ctx->display_list = display;
1421 
1422  ff_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
1423  }
1424 
1425  while (tmp_display_list) {
1426  display = tmp_display_list;
1427 
1428  tmp_display_list = display->next;
1429 
1430  av_freep(&display);
1431  }
1432 
1433  return 0;
1434 }
1435 
1436 
1437 #ifdef DEBUG
1438 static void save_display_set(DVBSubContext *ctx)
1439 {
1440  DVBSubRegion *region;
1441  DVBSubRegionDisplay *display;
1442  DVBSubCLUT *clut;
1443  uint32_t *clut_table;
1444  int x_pos, y_pos, width, height;
1445  int x, y, y_off, x_off;
1446  uint32_t *pbuf;
1447  char filename[32];
1448  static int fileno_index = 0;
1449 
1450  x_pos = -1;
1451  y_pos = -1;
1452  width = 0;
1453  height = 0;
1454 
1455  for (display = ctx->display_list; display; display = display->next) {
1456  region = get_region(ctx, display->region_id);
1457 
1458  if (!region)
1459  return;
1460 
1461  if (x_pos == -1) {
1462  x_pos = display->x_pos;
1463  y_pos = display->y_pos;
1464  width = region->width;
1465  height = region->height;
1466  } else {
1467  if (display->x_pos < x_pos) {
1468  width += (x_pos - display->x_pos);
1469  x_pos = display->x_pos;
1470  }
1471 
1472  if (display->y_pos < y_pos) {
1473  height += (y_pos - display->y_pos);
1474  y_pos = display->y_pos;
1475  }
1476 
1477  if (display->x_pos + region->width > x_pos + width) {
1478  width = display->x_pos + region->width - x_pos;
1479  }
1480 
1481  if (display->y_pos + region->height > y_pos + height) {
1482  height = display->y_pos + region->height - y_pos;
1483  }
1484  }
1485  }
1486 
1487  if (x_pos >= 0) {
1488 
1489  pbuf = av_malloc(width * height * 4);
1490  if (!pbuf)
1491  return;
1492 
1493  for (display = ctx->display_list; display; display = display->next) {
1494  region = get_region(ctx, display->region_id);
1495 
1496  if (!region)
1497  return;
1498 
1499  x_off = display->x_pos - x_pos;
1500  y_off = display->y_pos - y_pos;
1501 
1502  clut = get_clut(ctx, region->clut);
1503 
1504  if (!clut)
1505  clut = &default_clut;
1506 
1507  switch (region->depth) {
1508  case 2:
1509  clut_table = clut->clut4;
1510  break;
1511  case 8:
1512  clut_table = clut->clut256;
1513  break;
1514  case 4:
1515  default:
1516  clut_table = clut->clut16;
1517  break;
1518  }
1519 
1520  for (y = 0; y < region->height; y++) {
1521  for (x = 0; x < region->width; x++) {
1522  pbuf[((y + y_off) * width) + x_off + x] =
1523  clut_table[region->pbuf[y * region->width + x]];
1524  }
1525  }
1526 
1527  }
1528 
1529  snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index);
1530 
1531  png_save2(filename, pbuf, width, height);
1532 
1533  av_freep(&pbuf);
1534  }
1535 
1536  fileno_index++;
1537 }
1538 #endif
1539 
1541  const uint8_t *buf,
1542  int buf_size)
1543 {
1544  DVBSubContext *ctx = avctx->priv_data;
1545  DVBSubDisplayDefinition *display_def = ctx->display_definition;
1546  int dds_version, info_byte;
1547 
1548  if (buf_size < 5)
1549  return AVERROR_INVALIDDATA;
1550 
1551  info_byte = bytestream_get_byte(&buf);
1552  dds_version = info_byte >> 4;
1553  if (display_def && display_def->version == dds_version)
1554  return 0; // already have this display definition version
1555 
1556  if (!display_def) {
1557  display_def = av_mallocz(sizeof(*display_def));
1558  if (!display_def)
1559  return AVERROR(ENOMEM);
1560  ctx->display_definition = display_def;
1561  }
1562 
1563  display_def->version = dds_version;
1564  display_def->x = 0;
1565  display_def->y = 0;
1566  display_def->width = bytestream_get_be16(&buf) + 1;
1567  display_def->height = bytestream_get_be16(&buf) + 1;
1568  if (!avctx->width || !avctx->height) {
1569  avctx->width = display_def->width;
1570  avctx->height = display_def->height;
1571  }
1572 
1573  if (info_byte & 1<<3) { // display_window_flag
1574  if (buf_size < 13)
1575  return AVERROR_INVALIDDATA;
1576 
1577  display_def->x = bytestream_get_be16(&buf);
1578  display_def->width = bytestream_get_be16(&buf) - display_def->x + 1;
1579  display_def->y = bytestream_get_be16(&buf);
1580  display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;
1581  }
1582 
1583  return 0;
1584 }
1585 
1587  int buf_size, AVSubtitle *sub,int *got_output)
1588 {
1589  DVBSubContext *ctx = avctx->priv_data;
1590 
1591  if(ctx->compute_edt == 0)
1592  save_subtitle_set(avctx, sub, got_output);
1593 #ifdef DEBUG
1594  save_display_set(ctx);
1595 #endif
1596  return 0;
1597 }
1598 
1599 static int dvbsub_decode(AVCodecContext *avctx,
1600  void *data, int *data_size,
1601  AVPacket *avpkt)
1602 {
1603  const uint8_t *buf = avpkt->data;
1604  int buf_size = avpkt->size;
1605  DVBSubContext *ctx = avctx->priv_data;
1606  AVSubtitle *sub = data;
1607  const uint8_t *p, *p_end;
1608  int segment_type;
1609  int page_id;
1610  int segment_length;
1611  int i;
1612  int ret = 0;
1613  int got_segment = 0;
1614  int got_dds = 0;
1615 
1616  ff_dlog(avctx, "DVB sub packet:\n");
1617 
1618  for (i=0; i < buf_size; i++) {
1619  ff_dlog(avctx, "%02x ", buf[i]);
1620  if (i % 16 == 15)
1621  ff_dlog(avctx, "\n");
1622  }
1623 
1624  if (i % 16)
1625  ff_dlog(avctx, "\n");
1626 
1627  if (buf_size <= 6 || *buf != 0x0f) {
1628  ff_dlog(avctx, "incomplete or broken packet");
1629  return AVERROR_INVALIDDATA;
1630  }
1631 
1632  p = buf;
1633  p_end = buf + buf_size;
1634 
1635  while (p_end - p >= 6 && *p == 0x0f) {
1636  p += 1;
1637  segment_type = *p++;
1638  page_id = AV_RB16(p);
1639  p += 2;
1640  segment_length = AV_RB16(p);
1641  p += 2;
1642 
1643  if (avctx->debug & FF_DEBUG_STARTCODE) {
1644  av_log(avctx, AV_LOG_DEBUG, "segment_type:%d page_id:%d segment_length:%d\n", segment_type, page_id, segment_length);
1645  }
1646 
1647  if (p_end - p < segment_length) {
1648  ff_dlog(avctx, "incomplete or broken packet");
1649  ret = -1;
1650  goto end;
1651  }
1652 
1653  if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||
1654  ctx->composition_id == -1 || ctx->ancillary_id == -1) {
1655  int ret = 0;
1656  switch (segment_type) {
1657  case DVBSUB_PAGE_SEGMENT:
1658  ret = dvbsub_parse_page_segment(avctx, p, segment_length, sub, data_size);
1659  got_segment |= 1;
1660  break;
1661  case DVBSUB_REGION_SEGMENT:
1662  ret = dvbsub_parse_region_segment(avctx, p, segment_length);
1663  got_segment |= 2;
1664  break;
1665  case DVBSUB_CLUT_SEGMENT:
1666  ret = dvbsub_parse_clut_segment(avctx, p, segment_length);
1667  if (ret < 0) goto end;
1668  got_segment |= 4;
1669  break;
1670  case DVBSUB_OBJECT_SEGMENT:
1671  ret = dvbsub_parse_object_segment(avctx, p, segment_length);
1672  got_segment |= 8;
1673  break;
1676  segment_length);
1677  got_dds = 1;
1678  break;
1680  ret = dvbsub_display_end_segment(avctx, p, segment_length, sub, data_size);
1681  if (got_segment == 15 && !got_dds && !avctx->width && !avctx->height) {
1682  // Default from ETSI EN 300 743 V1.3.1 (7.2.1)
1683  avctx->width = 720;
1684  avctx->height = 576;
1685  }
1686  got_segment |= 16;
1687  break;
1688  default:
1689  ff_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",
1690  segment_type, page_id, segment_length);
1691  break;
1692  }
1693  if (ret < 0)
1694  goto end;
1695  }
1696 
1697  p += segment_length;
1698  }
1699  // Some streams do not send a display segment but if we have all the other
1700  // segments then we need no further data.
1701  if (got_segment == 15) {
1702  av_log(avctx, AV_LOG_DEBUG, "Missing display_end_segment, emulating\n");
1703  dvbsub_display_end_segment(avctx, p, 0, sub, data_size);
1704  }
1705 
1706 end:
1707  if(ret < 0) {
1708  *data_size = 0;
1709  avsubtitle_free(sub);
1710  return ret;
1711  } else {
1712  if(ctx->compute_edt == 1 )
1713  FFSWAP(int64_t, ctx->prev_start, sub->pts);
1714  }
1715 
1716  return p - buf;
1717 }
1718 
1719 #define DS AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_SUBTITLE_PARAM
1720 static const AVOption options[] = {
1721  {"compute_edt", "compute end of time using pts or timeout", offsetof(DVBSubContext, compute_edt), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DS},
1722  {"compute_clut", "compute clut when not available(-1) or always(1) or never(0)", offsetof(DVBSubContext, compute_clut), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, DS},
1723  {"dvb_substream", "", offsetof(DVBSubContext, substream), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 63, DS},
1724  {NULL}
1725 };
1726 static const AVClass dvbsubdec_class = {
1727  .class_name = "DVB Sub Decoder",
1728  .item_name = av_default_item_name,
1729  .option = options,
1730  .version = LIBAVUTIL_VERSION_INT,
1731 };
1732 
1734  .name = "dvbsub",
1735  .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),
1736  .type = AVMEDIA_TYPE_SUBTITLE,
1738  .priv_data_size = sizeof(DVBSubContext),
1740  .close = dvbsub_close_decoder,
1741  .decode = dvbsub_decode,
1742  .priv_class = &dvbsubdec_class,
1743 };
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
float v
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int linesize[AV_NUM_DATA_POINTERS]
number of bytes per line
Definition: avcodec.h:3746
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:946
static DVBSubRegion * get_region(DVBSubContext *ctx, int region_id)
Definition: dvbsubdec.c:274
AVOption.
Definition: opt.h:255
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:260
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define LIBAVUTIL_VERSION_INT
Definition: version.h:62
#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:1424
const char * b
Definition: vf_curves.c:109
#define V(x, y)
Various defines for YUV<->RGB conversion.
unsigned num_rects
Definition: avcodec.h:3803
#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:1351
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
Picture data structure.
Definition: avcodec.h:3744
AVCodec.
Definition: avcodec.h:3472
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:295
uint8_t
#define av_cold
Definition: attributes.h:74
#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.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointers to the image data planes
Definition: avcodec.h:3745
#define AVPALETTE_SIZE
Definition: pixfmt.h:33
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
int y
Definition: f_ebur128.c:90
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1617
static const AVClass dvbsubdec_class
Definition: dvbsubdec.c:1726
static AVFrame * frame
uint8_t * data
Definition: avcodec.h:1423
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:212
#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:140
#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:175
const char * r
Definition: vf_curves.c:107
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
#define FF_COMPLIANCE_NORMAL
Definition: avcodec.h:2823
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:1540
const char * name
Name of the codec implementation.
Definition: avcodec.h:3479
GLsizei count
Definition: opengl_enc.c:109
Libavcodec external API header.
#define fail()
Definition: checkasm.h:57
int depth
Definition: v4l.c:62
uint32_t end_display_time
Definition: avcodec.h:3802
int64_t pts
Same as packet pts, in AV_TIME_BASE.
Definition: avcodec.h:3805
struct DVBSubObject * next
Definition: dvbsubdec.c:190
AVCodec ff_dvbsub_decoder
Definition: dvbsubdec.c:1733
#define FF_DEBUG_STARTCODE
Definition: avcodec.h:2856
A bitmap, pict will be set.
Definition: avcodec.h:3756
float y
int composition_id
Definition: dvbsubdec.c:233
DVBSubObjectDisplay * display_list
Definition: dvbsubdec.c:217
struct DVBSubObjectDisplay * region_list_next
Definition: dvbsubdec.c:178
int width
picture width / height.
Definition: avcodec.h:1681
static int dvbsub_parse_clut_segment(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: dvbsubdec.c:1122
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
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#define DS
Definition: dvbsubdec.c:1719
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
#define DVBSUB_CLUT_SEGMENT
Definition: dvbsubdec.c:31
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:2842
main external API structure.
Definition: avcodec.h:1502
static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf, int buf_size, AVSubtitle *sub, int *got_output)
Definition: dvbsubdec.c:1586
static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
Definition: vf_drawtext.c:765
void avsubtitle_free(AVSubtitle *sub)
Free all allocated data in the given subtitle struct.
Definition: utils.c:2883
int x
Definition: f_ebur128.c:90
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:1618
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:304
BYTE int const BYTE int int int height
Definition: avisynth_c.h:676
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:90
#define DVBSUB_DISPLAY_SEGMENT
Definition: dvbsubdec.c:34
struct DVBSubRegionDisplay * next
Definition: dvbsubdec.c:199
rational number numerator/denominator
Definition: rational.h:43
#define YUV_TO_RGB2_CCIR(r, g, b, y1)
Definition: colorspace.h:44
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:410
int h
Definition: f_ebur128.c:90
#define snprintf
Definition: snprintf.h:34
#define DVBSUB_PAGE_SEGMENT
Definition: dvbsubdec.c:29
static void compute_default_clut(AVPicture *frame, int w, int h)
Definition: dvbsubdec.c:764
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:1720
#define DVBSUB_REGION_SEGMENT
Definition: dvbsubdec.c:30
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:523
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:90
static int dvbsub_decode(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
Definition: dvbsubdec.c:1599
void * priv_data
Definition: avcodec.h:1544
#define av_free(p)
static int dvbsub_parse_object_segment(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: dvbsubdec.c:1062
static void * av_mallocz_array(size_t nmemb, size_t size)
Definition: mem.h:228
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:1221
#define FFSWAP(type, a, b)
Definition: common.h:84
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:1400
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 (MPEG4, ...).
Definition: avcodec.h:2820
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:240
#define av_unused
Definition: attributes.h:118
static int width
static int16_t block[64]
Definition: dct-test.c:110