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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 
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,j;
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  for (j = 0; j < 4; j++) {
928  rect->pict.data[j] = rect->data[j];
929  rect->pict.linesize[j] = rect->linesize[j];
930  }
932 #endif
933 
934  i++;
935  }
936  }
937 
938  return 0;
939 fail:
940  if (sub->rects) {
941  for(i=0; i<sub->num_rects; i++) {
942  rect = sub->rects[i];
943  if (rect) {
944  av_freep(&rect->data[0]);
945  av_freep(&rect->data[1]);
946  }
947  av_freep(&sub->rects[i]);
948  }
949  av_freep(&sub->rects);
950  }
951  sub->num_rects = 0;
952  return ret;
953 }
954 
956  const uint8_t *buf, int buf_size, int top_bottom, int non_mod)
957 {
958  DVBSubContext *ctx = avctx->priv_data;
959 
960  DVBSubRegion *region = get_region(ctx, display->region_id);
961  const uint8_t *buf_end = buf + buf_size;
962  uint8_t *pbuf;
963  int x_pos, y_pos;
964  int i;
965 
966  uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf};
967  uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
968  uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
969  0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
970  uint8_t *map_table;
971 
972 #if 0
973  ff_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size,
974  top_bottom ? "bottom" : "top");
975 
976  for (i = 0; i < buf_size; i++) {
977  if (i % 16 == 0)
978  ff_dlog(avctx, "0x%8p: ", buf+i);
979 
980  ff_dlog(avctx, "%02x ", buf[i]);
981  if (i % 16 == 15)
982  ff_dlog(avctx, "\n");
983  }
984 
985  if (i % 16)
986  ff_dlog(avctx, "\n");
987 #endif
988 
989  if (!region)
990  return;
991 
992  pbuf = region->pbuf;
993  region->dirty = 1;
994 
995  x_pos = display->x_pos;
996  y_pos = display->y_pos;
997 
998  y_pos += top_bottom;
999 
1000  while (buf < buf_end) {
1001  if ((*buf!=0xf0 && x_pos >= region->width) || y_pos >= region->height) {
1002  av_log(avctx, AV_LOG_ERROR, "Invalid object location! %d-%d %d-%d %02x\n", x_pos, region->width, y_pos, region->height, *buf);
1003  return;
1004  }
1005 
1006  switch (*buf++) {
1007  case 0x10:
1008  if (region->depth == 8)
1009  map_table = map2to8;
1010  else if (region->depth == 4)
1011  map_table = map2to4;
1012  else
1013  map_table = NULL;
1014 
1015  x_pos = dvbsub_read_2bit_string(avctx, pbuf + (y_pos * region->width),
1016  region->width, &buf, buf_end - buf,
1017  non_mod, map_table, x_pos);
1018  break;
1019  case 0x11:
1020  if (region->depth < 4) {
1021  av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
1022  return;
1023  }
1024 
1025  if (region->depth == 8)
1026  map_table = map4to8;
1027  else
1028  map_table = NULL;
1029 
1030  x_pos = dvbsub_read_4bit_string(avctx, pbuf + (y_pos * region->width),
1031  region->width, &buf, buf_end - buf,
1032  non_mod, map_table, x_pos);
1033  break;
1034  case 0x12:
1035  if (region->depth < 8) {
1036  av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
1037  return;
1038  }
1039 
1040  x_pos = dvbsub_read_8bit_string(avctx, pbuf + (y_pos * region->width),
1041  region->width, &buf, buf_end - buf,
1042  non_mod, NULL, x_pos);
1043  break;
1044 
1045  case 0x20:
1046  map2to4[0] = (*buf) >> 4;
1047  map2to4[1] = (*buf++) & 0xf;
1048  map2to4[2] = (*buf) >> 4;
1049  map2to4[3] = (*buf++) & 0xf;
1050  break;
1051  case 0x21:
1052  for (i = 0; i < 4; i++)
1053  map2to8[i] = *buf++;
1054  break;
1055  case 0x22:
1056  for (i = 0; i < 16; i++)
1057  map4to8[i] = *buf++;
1058  break;
1059 
1060  case 0xf0:
1061  x_pos = display->x_pos;
1062  y_pos += 2;
1063  break;
1064  default:
1065  av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
1066  }
1067  }
1068 
1069 }
1070 
1072  const uint8_t *buf, int buf_size)
1073 {
1074  DVBSubContext *ctx = avctx->priv_data;
1075 
1076  const uint8_t *buf_end = buf + buf_size;
1077  int object_id;
1078  DVBSubObject *object;
1079  DVBSubObjectDisplay *display;
1080  int top_field_len, bottom_field_len;
1081 
1082  int coding_method, non_modifying_color;
1083 
1084  object_id = AV_RB16(buf);
1085  buf += 2;
1086 
1087  object = get_object(ctx, object_id);
1088 
1089  if (!object)
1090  return AVERROR_INVALIDDATA;
1091 
1092  coding_method = ((*buf) >> 2) & 3;
1093  non_modifying_color = ((*buf++) >> 1) & 1;
1094 
1095  if (coding_method == 0) {
1096  top_field_len = AV_RB16(buf);
1097  buf += 2;
1098  bottom_field_len = AV_RB16(buf);
1099  buf += 2;
1100 
1101  if (buf + top_field_len + bottom_field_len > buf_end) {
1102  av_log(avctx, AV_LOG_ERROR, "Field data size %d+%d too large\n", top_field_len, bottom_field_len);
1103  return AVERROR_INVALIDDATA;
1104  }
1105 
1106  for (display = object->display_list; display; display = display->object_list_next) {
1107  const uint8_t *block = buf;
1108  int bfl = bottom_field_len;
1109 
1110  dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
1111  non_modifying_color);
1112 
1113  if (bottom_field_len > 0)
1114  block = buf + top_field_len;
1115  else
1116  bfl = top_field_len;
1117 
1118  dvbsub_parse_pixel_data_block(avctx, display, block, bfl, 1,
1119  non_modifying_color);
1120  }
1121 
1122 /* } else if (coding_method == 1) {*/
1123 
1124  } else {
1125  av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
1126  }
1127 
1128  return 0;
1129 }
1130 
1132  const uint8_t *buf, int buf_size)
1133 {
1134  DVBSubContext *ctx = avctx->priv_data;
1135 
1136  const uint8_t *buf_end = buf + buf_size;
1137  int i, clut_id;
1138  int version;
1139  DVBSubCLUT *clut;
1140  int entry_id, depth , full_range;
1141  int y, cr, cb, alpha;
1142  int r, g, b, r_add, g_add, b_add;
1143 
1144  ff_dlog(avctx, "DVB clut packet:\n");
1145 
1146  for (i=0; i < buf_size; i++) {
1147  ff_dlog(avctx, "%02x ", buf[i]);
1148  if (i % 16 == 15)
1149  ff_dlog(avctx, "\n");
1150  }
1151 
1152  if (i % 16)
1153  ff_dlog(avctx, "\n");
1154 
1155  clut_id = *buf++;
1156  version = ((*buf)>>4)&15;
1157  buf += 1;
1158 
1159  clut = get_clut(ctx, clut_id);
1160 
1161  if (!clut) {
1162  clut = av_malloc(sizeof(DVBSubCLUT));
1163  if (!clut)
1164  return AVERROR(ENOMEM);
1165 
1166  memcpy(clut, &default_clut, sizeof(DVBSubCLUT));
1167 
1168  clut->id = clut_id;
1169  clut->version = -1;
1170 
1171  clut->next = ctx->clut_list;
1172  ctx->clut_list = clut;
1173  }
1174 
1175  if (clut->version != version) {
1176 
1177  clut->version = version;
1178 
1179  while (buf + 4 < buf_end) {
1180  entry_id = *buf++;
1181 
1182  depth = (*buf) & 0xe0;
1183 
1184  if (depth == 0) {
1185  av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
1186  }
1187 
1188  full_range = (*buf++) & 1;
1189 
1190  if (full_range) {
1191  y = *buf++;
1192  cr = *buf++;
1193  cb = *buf++;
1194  alpha = *buf++;
1195  } else {
1196  y = buf[0] & 0xfc;
1197  cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
1198  cb = (buf[1] << 2) & 0xf0;
1199  alpha = (buf[1] << 6) & 0xc0;
1200 
1201  buf += 2;
1202  }
1203 
1204  if (y == 0)
1205  alpha = 0xff;
1206 
1207  YUV_TO_RGB1_CCIR(cb, cr);
1208  YUV_TO_RGB2_CCIR(r, g, b, y);
1209 
1210  ff_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
1211  if (!!(depth & 0x80) + !!(depth & 0x40) + !!(depth & 0x20) > 1) {
1212  ff_dlog(avctx, "More than one bit level marked: %x\n", depth);
1214  return AVERROR_INVALIDDATA;
1215  }
1216 
1217  if (depth & 0x80)
1218  clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
1219  else if (depth & 0x40)
1220  clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
1221  else if (depth & 0x20)
1222  clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
1223  }
1224  }
1225 
1226  return 0;
1227 }
1228 
1229 
1231  const uint8_t *buf, int buf_size)
1232 {
1233  DVBSubContext *ctx = avctx->priv_data;
1234 
1235  const uint8_t *buf_end = buf + buf_size;
1236  int region_id, object_id;
1237  int av_unused version;
1238  DVBSubRegion *region;
1239  DVBSubObject *object;
1240  DVBSubObjectDisplay *display;
1241  int fill;
1242 
1243  if (buf_size < 10)
1244  return AVERROR_INVALIDDATA;
1245 
1246  region_id = *buf++;
1247 
1248  region = get_region(ctx, region_id);
1249 
1250  if (!region) {
1251  region = av_mallocz(sizeof(DVBSubRegion));
1252  if (!region)
1253  return AVERROR(ENOMEM);
1254 
1255  region->id = region_id;
1256  region->version = -1;
1257 
1258  region->next = ctx->region_list;
1259  ctx->region_list = region;
1260  }
1261 
1262  version = ((*buf)>>4) & 15;
1263  fill = ((*buf++) >> 3) & 1;
1264 
1265  region->width = AV_RB16(buf);
1266  buf += 2;
1267  region->height = AV_RB16(buf);
1268  buf += 2;
1269 
1270  if (region->width * region->height != region->buf_size) {
1271  av_free(region->pbuf);
1272 
1273  region->buf_size = region->width * region->height;
1274 
1275  region->pbuf = av_malloc(region->buf_size);
1276  if (!region->pbuf) {
1277  region->buf_size =
1278  region->width =
1279  region->height = 0;
1280  return AVERROR(ENOMEM);
1281  }
1282 
1283  fill = 1;
1284  region->dirty = 0;
1285  }
1286 
1287  region->depth = 1 << (((*buf++) >> 2) & 7);
1288  if(region->depth<2 || region->depth>8){
1289  av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth);
1290  region->depth= 4;
1291  }
1292  region->clut = *buf++;
1293 
1294  if (region->depth == 8) {
1295  region->bgcolor = *buf++;
1296  buf += 1;
1297  } else {
1298  buf += 1;
1299 
1300  if (region->depth == 4)
1301  region->bgcolor = (((*buf++) >> 4) & 15);
1302  else
1303  region->bgcolor = (((*buf++) >> 2) & 3);
1304  }
1305 
1306  ff_dlog(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
1307 
1308  if (fill) {
1309  memset(region->pbuf, region->bgcolor, region->buf_size);
1310  ff_dlog(avctx, "Fill region (%d)\n", region->bgcolor);
1311  }
1312 
1313  delete_region_display_list(ctx, region);
1314 
1315  while (buf + 5 < buf_end) {
1316  object_id = AV_RB16(buf);
1317  buf += 2;
1318 
1319  object = get_object(ctx, object_id);
1320 
1321  if (!object) {
1322  object = av_mallocz(sizeof(DVBSubObject));
1323  if (!object)
1324  return AVERROR(ENOMEM);
1325 
1326  object->id = object_id;
1327  object->next = ctx->object_list;
1328  ctx->object_list = object;
1329  }
1330 
1331  object->type = (*buf) >> 6;
1332 
1333  display = av_mallocz(sizeof(DVBSubObjectDisplay));
1334  if (!display)
1335  return AVERROR(ENOMEM);
1336 
1337  display->object_id = object_id;
1338  display->region_id = region_id;
1339 
1340  display->x_pos = AV_RB16(buf) & 0xfff;
1341  buf += 2;
1342  display->y_pos = AV_RB16(buf) & 0xfff;
1343  buf += 2;
1344 
1345  if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
1346  display->fgcolor = *buf++;
1347  display->bgcolor = *buf++;
1348  }
1349 
1350  display->region_list_next = region->display_list;
1351  region->display_list = display;
1352 
1353  display->object_list_next = object->display_list;
1354  object->display_list = display;
1355  }
1356 
1357  return 0;
1358 }
1359 
1361  const uint8_t *buf, int buf_size, AVSubtitle *sub, int *got_output)
1362 {
1363  DVBSubContext *ctx = avctx->priv_data;
1364  DVBSubRegionDisplay *display;
1365  DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
1366 
1367  const uint8_t *buf_end = buf + buf_size;
1368  int region_id;
1369  int page_state;
1370  int timeout;
1371  int version;
1372 
1373  if (buf_size < 1)
1374  return AVERROR_INVALIDDATA;
1375 
1376  timeout = *buf++;
1377  version = ((*buf)>>4) & 15;
1378  page_state = ((*buf++) >> 2) & 3;
1379 
1380  if (ctx->version == version) {
1381  return 0;
1382  }
1383 
1384  ctx->time_out = timeout;
1385  ctx->version = version;
1386 
1387  ff_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
1388 
1389  if(ctx->compute_edt == 1)
1390  save_subtitle_set(avctx, sub, got_output);
1391 
1392  if (page_state == 1 || page_state == 2) {
1393  delete_regions(ctx);
1394  delete_objects(ctx);
1395  delete_cluts(ctx);
1396  }
1397 
1398  tmp_display_list = ctx->display_list;
1399  ctx->display_list = NULL;
1400 
1401  while (buf + 5 < buf_end) {
1402  region_id = *buf++;
1403  buf += 1;
1404 
1405  display = tmp_display_list;
1406  tmp_ptr = &tmp_display_list;
1407 
1408  while (display && display->region_id != region_id) {
1409  tmp_ptr = &display->next;
1410  display = display->next;
1411  }
1412 
1413  if (!display) {
1414  display = av_mallocz(sizeof(DVBSubRegionDisplay));
1415  if (!display)
1416  return AVERROR(ENOMEM);
1417  }
1418 
1419  display->region_id = region_id;
1420 
1421  display->x_pos = AV_RB16(buf);
1422  buf += 2;
1423  display->y_pos = AV_RB16(buf);
1424  buf += 2;
1425 
1426  *tmp_ptr = display->next;
1427 
1428  display->next = ctx->display_list;
1429  ctx->display_list = display;
1430 
1431  ff_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
1432  }
1433 
1434  while (tmp_display_list) {
1435  display = tmp_display_list;
1436 
1437  tmp_display_list = display->next;
1438 
1439  av_freep(&display);
1440  }
1441 
1442  return 0;
1443 }
1444 
1445 
1446 #ifdef DEBUG
1447 static int save_display_set(DVBSubContext *ctx)
1448 {
1449  DVBSubRegion *region;
1450  DVBSubRegionDisplay *display;
1451  DVBSubCLUT *clut;
1452  uint32_t *clut_table;
1453  int x_pos, y_pos, width, height;
1454  int x, y, y_off, x_off;
1455  uint32_t *pbuf;
1456  char filename[32];
1457  static int fileno_index = 0;
1458 
1459  x_pos = -1;
1460  y_pos = -1;
1461  width = 0;
1462  height = 0;
1463 
1464  for (display = ctx->display_list; display; display = display->next) {
1465  region = get_region(ctx, display->region_id);
1466 
1467  if (!region)
1468  return -1;
1469 
1470  if (x_pos == -1) {
1471  x_pos = display->x_pos;
1472  y_pos = display->y_pos;
1473  width = region->width;
1474  height = region->height;
1475  } else {
1476  if (display->x_pos < x_pos) {
1477  width += (x_pos - display->x_pos);
1478  x_pos = display->x_pos;
1479  }
1480 
1481  if (display->y_pos < y_pos) {
1482  height += (y_pos - display->y_pos);
1483  y_pos = display->y_pos;
1484  }
1485 
1486  if (display->x_pos + region->width > x_pos + width) {
1487  width = display->x_pos + region->width - x_pos;
1488  }
1489 
1490  if (display->y_pos + region->height > y_pos + height) {
1491  height = display->y_pos + region->height - y_pos;
1492  }
1493  }
1494  }
1495 
1496  if (x_pos >= 0) {
1497 
1498  pbuf = av_malloc(width * height * 4);
1499  if (!pbuf)
1500  return -1;
1501 
1502  for (display = ctx->display_list; display; display = display->next) {
1503  region = get_region(ctx, display->region_id);
1504 
1505  if (!region)
1506  return -1;
1507 
1508  x_off = display->x_pos - x_pos;
1509  y_off = display->y_pos - y_pos;
1510 
1511  clut = get_clut(ctx, region->clut);
1512 
1513  if (!clut)
1514  clut = &default_clut;
1515 
1516  switch (region->depth) {
1517  case 2:
1518  clut_table = clut->clut4;
1519  break;
1520  case 8:
1521  clut_table = clut->clut256;
1522  break;
1523  case 4:
1524  default:
1525  clut_table = clut->clut16;
1526  break;
1527  }
1528 
1529  for (y = 0; y < region->height; y++) {
1530  for (x = 0; x < region->width; x++) {
1531  pbuf[((y + y_off) * width) + x_off + x] =
1532  clut_table[region->pbuf[y * region->width + x]];
1533  }
1534  }
1535 
1536  }
1537 
1538  snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index);
1539 
1540  png_save2(filename, pbuf, width, height);
1541 
1542  av_freep(&pbuf);
1543  }
1544 
1545  fileno_index++;
1546  return 0;
1547 }
1548 #endif
1549 
1551  const uint8_t *buf,
1552  int buf_size)
1553 {
1554  DVBSubContext *ctx = avctx->priv_data;
1555  DVBSubDisplayDefinition *display_def = ctx->display_definition;
1556  int dds_version, info_byte;
1557 
1558  if (buf_size < 5)
1559  return AVERROR_INVALIDDATA;
1560 
1561  info_byte = bytestream_get_byte(&buf);
1562  dds_version = info_byte >> 4;
1563  if (display_def && display_def->version == dds_version)
1564  return 0; // already have this display definition version
1565 
1566  if (!display_def) {
1567  display_def = av_mallocz(sizeof(*display_def));
1568  if (!display_def)
1569  return AVERROR(ENOMEM);
1570  ctx->display_definition = display_def;
1571  }
1572 
1573  display_def->version = dds_version;
1574  display_def->x = 0;
1575  display_def->y = 0;
1576  display_def->width = bytestream_get_be16(&buf) + 1;
1577  display_def->height = bytestream_get_be16(&buf) + 1;
1578  if (!avctx->width || !avctx->height) {
1579  avctx->width = display_def->width;
1580  avctx->height = display_def->height;
1581  }
1582 
1583  if (info_byte & 1<<3) { // display_window_flag
1584  if (buf_size < 13)
1585  return AVERROR_INVALIDDATA;
1586 
1587  display_def->x = bytestream_get_be16(&buf);
1588  display_def->width = bytestream_get_be16(&buf) - display_def->x + 1;
1589  display_def->y = bytestream_get_be16(&buf);
1590  display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;
1591  }
1592 
1593  return 0;
1594 }
1595 
1597  int buf_size, AVSubtitle *sub,int *got_output)
1598 {
1599  DVBSubContext *ctx = avctx->priv_data;
1600 
1601  if(ctx->compute_edt == 0)
1602  save_subtitle_set(avctx, sub, got_output);
1603 #ifdef DEBUG
1604  save_display_set(ctx);
1605 #endif
1606  return 0;
1607 }
1608 
1609 static int dvbsub_decode(AVCodecContext *avctx,
1610  void *data, int *data_size,
1611  AVPacket *avpkt)
1612 {
1613  const uint8_t *buf = avpkt->data;
1614  int buf_size = avpkt->size;
1615  DVBSubContext *ctx = avctx->priv_data;
1616  AVSubtitle *sub = data;
1617  const uint8_t *p, *p_end;
1618  int segment_type;
1619  int page_id;
1620  int segment_length;
1621  int i;
1622  int ret = 0;
1623  int got_segment = 0;
1624  int got_dds = 0;
1625 
1626  ff_dlog(avctx, "DVB sub packet:\n");
1627 
1628  for (i=0; i < buf_size; i++) {
1629  ff_dlog(avctx, "%02x ", buf[i]);
1630  if (i % 16 == 15)
1631  ff_dlog(avctx, "\n");
1632  }
1633 
1634  if (i % 16)
1635  ff_dlog(avctx, "\n");
1636 
1637  if (buf_size <= 6 || *buf != 0x0f) {
1638  ff_dlog(avctx, "incomplete or broken packet");
1639  return AVERROR_INVALIDDATA;
1640  }
1641 
1642  p = buf;
1643  p_end = buf + buf_size;
1644 
1645  while (p_end - p >= 6 && *p == 0x0f) {
1646  p += 1;
1647  segment_type = *p++;
1648  page_id = AV_RB16(p);
1649  p += 2;
1650  segment_length = AV_RB16(p);
1651  p += 2;
1652 
1653  if (avctx->debug & FF_DEBUG_STARTCODE) {
1654  av_log(avctx, AV_LOG_DEBUG, "segment_type:%d page_id:%d segment_length:%d\n", segment_type, page_id, segment_length);
1655  }
1656 
1657  if (p_end - p < segment_length) {
1658  ff_dlog(avctx, "incomplete or broken packet");
1659  ret = -1;
1660  goto end;
1661  }
1662 
1663  if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||
1664  ctx->composition_id == -1 || ctx->ancillary_id == -1) {
1665  int ret = 0;
1666  switch (segment_type) {
1667  case DVBSUB_PAGE_SEGMENT:
1668  ret = dvbsub_parse_page_segment(avctx, p, segment_length, sub, data_size);
1669  got_segment |= 1;
1670  break;
1671  case DVBSUB_REGION_SEGMENT:
1672  ret = dvbsub_parse_region_segment(avctx, p, segment_length);
1673  got_segment |= 2;
1674  break;
1675  case DVBSUB_CLUT_SEGMENT:
1676  ret = dvbsub_parse_clut_segment(avctx, p, segment_length);
1677  if (ret < 0) goto end;
1678  got_segment |= 4;
1679  break;
1680  case DVBSUB_OBJECT_SEGMENT:
1681  ret = dvbsub_parse_object_segment(avctx, p, segment_length);
1682  got_segment |= 8;
1683  break;
1686  segment_length);
1687  got_dds = 1;
1688  break;
1690  ret = dvbsub_display_end_segment(avctx, p, segment_length, sub, data_size);
1691  if (got_segment == 15 && !got_dds && !avctx->width && !avctx->height) {
1692  // Default from ETSI EN 300 743 V1.3.1 (7.2.1)
1693  avctx->width = 720;
1694  avctx->height = 576;
1695  }
1696  got_segment |= 16;
1697  break;
1698  default:
1699  ff_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",
1700  segment_type, page_id, segment_length);
1701  break;
1702  }
1703  if (ret < 0)
1704  goto end;
1705  }
1706 
1707  p += segment_length;
1708  }
1709  // Some streams do not send a display segment but if we have all the other
1710  // segments then we need no further data.
1711  if (got_segment == 15) {
1712  av_log(avctx, AV_LOG_DEBUG, "Missing display_end_segment, emulating\n");
1713  dvbsub_display_end_segment(avctx, p, 0, sub, data_size);
1714  }
1715 
1716 end:
1717  if(ret < 0) {
1718  *data_size = 0;
1719  avsubtitle_free(sub);
1720  return ret;
1721  } else {
1722  if(ctx->compute_edt == 1 )
1723  FFSWAP(int64_t, ctx->prev_start, sub->pts);
1724  }
1725 
1726  return p - buf;
1727 }
1728 
1729 #define DS AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_SUBTITLE_PARAM
1730 static const AVOption options[] = {
1731  {"compute_edt", "compute end of time using pts or timeout", offsetof(DVBSubContext, compute_edt), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DS},
1732  {"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},
1733  {"dvb_substream", "", offsetof(DVBSubContext, substream), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 63, DS},
1734  {NULL}
1735 };
1736 static const AVClass dvbsubdec_class = {
1737  .class_name = "DVB Sub Decoder",
1738  .item_name = av_default_item_name,
1739  .option = options,
1740  .version = LIBAVUTIL_VERSION_INT,
1741 };
1742 
1744  .name = "dvbsub",
1745  .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),
1746  .type = AVMEDIA_TYPE_SUBTITLE,
1748  .priv_data_size = sizeof(DVBSubContext),
1750  .close = dvbsub_close_decoder,
1751  .decode = dvbsub_decode,
1752  .priv_class = &dvbsubdec_class,
1753 };
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:955
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
AVFormatContext * ctx
Definition: movenc-test.c:48
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: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:1578
const char * b
Definition: vf_curves.c:109
#define V(x, y)
Various defines for YUV<->RGB conversion.
unsigned num_rects
Definition: avcodec.h:3895
#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:1360
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:3535
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:1757
static const AVClass dvbsubdec_class
Definition: dvbsubdec.c:1736
uint8_t * data
Definition: avcodec.h:1577
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: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:1550
const char * name
Name of the codec implementation.
Definition: avcodec.h:3542
GLsizei count
Definition: opengl_enc.c:109
#define fail()
Definition: checkasm.h:81
int depth
Definition: v4l.c:62
uint32_t end_display_time
Definition: avcodec.h:3894
int64_t pts
Same as packet pts, in AV_TIME_BASE.
Definition: avcodec.h:3897
struct DVBSubObject * next
Definition: dvbsubdec.c:190
AVCodec ff_dvbsub_decoder
Definition: dvbsubdec.c:1743
A bitmap, pict will be set.
Definition: avcodec.h:3839
int linesize[4]
Definition: avcodec.h:3875
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:1829
static int dvbsub_parse_clut_segment(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: dvbsubdec.c:1131
#define width
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:3874
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#define DS
Definition: dvbsubdec.c:1729
#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:2881
main external API structure.
Definition: avcodec.h:1642
static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf, int buf_size, AVSubtitle *sub, int *got_output)
Definition: dvbsubdec.c:1596
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:2687
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:1758
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:312
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:2862
rational number numerator/denominator
Definition: rational.h:43
#define YUV_TO_RGB2_CCIR(r, g, b, y1)
Definition: colorspace.h:54
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:418
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:1730
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:722
#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:1609
void * priv_data
Definition: avcodec.h:1684
#define av_free(p)
#define FF_DEBUG_STARTCODE
Definition: avcodec.h:2895
#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:1071
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:1230
#define FFSWAP(type, a, b)
Definition: common.h:99
#define height
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:1554
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:2859
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:240
#define av_unused
Definition: attributes.h:126
static int16_t block[64]
Definition: dct-test.c:112