quicktime/ffmpeg/libavcodec/dvbsubdec.c

   1 /*
   2  * DVB subtitle decoding for ffmpeg
   3  * Copyright (c) 2005 Ian Caulfield.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19 #include "avcodec.h"
  20 #include "dsputil.h"
  21 #include "bitstream.h"
  22
  23 //#define DEBUG
  24 //#define DEBUG_PACKET_CONTENTS
  25 //#define DEBUG_SAVE_IMAGES
  26
  27 #define DVBSUB_PAGE_SEGMENT     0x10
  28 #define DVBSUB_REGION_SEGMENT   0x11
  29 #define DVBSUB_CLUT_SEGMENT     0x12
  30 #define DVBSUB_OBJECT_SEGMENT   0x13
  31 #define DVBSUB_DISPLAY_SEGMENT  0x80
  32
  33 static unsigned char *cm;
  34
  35 #ifdef DEBUG_SAVE_IMAGES
  36 #undef fprintf
  37 #if 0
  38 static void png_save(const char *filename, uint8_t *bitmap, int w, int h,
  39                      uint32_t *rgba_palette)
  40 {
  41     int x, y, v;
  42     FILE *f;
  43     char fname[40], fname2[40];
  44     char command[1024];
  45
  46     snprintf(fname, 40, "%s.ppm", filename);
  47
  48     f = fopen(fname, "w");
  49     if (!f) {
  50         perror(fname);
  51         exit(1);
  52     }
  53     fprintf(f, "P6\n"
  54             "%d %d\n"
  55             "%d\n",
  56             w, h, 255);
  57     for(y = 0; y < h; y++) {
  58         for(x = 0; x < w; x++) {
  59             v = rgba_palette[bitmap[y * w + x]];
  60             putc((v >> 16) & 0xff, f);
  61             putc((v >> 8) & 0xff, f);
  62             putc((v >> 0) & 0xff, f);
  63         }
  64     }
  65     fclose(f);
  66
  67
  68     snprintf(fname2, 40, "%s-a.pgm", filename);
  69
  70     f = fopen(fname2, "w");
  71     if (!f) {
  72         perror(fname2);
  73         exit(1);
  74     }
  75     fprintf(f, "P5\n"
  76             "%d %d\n"
  77             "%d\n",
  78             w, h, 255);
  79     for(y = 0; y < h; y++) {
  80         for(x = 0; x < w; x++) {
  81             v = rgba_palette[bitmap[y * w + x]];
  82             putc((v >> 24) & 0xff, f);
  83         }
  84     }
  85     fclose(f);
  86
  87     snprintf(command, 1024, "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
  88     system(command);
  89
  90     snprintf(command, 1024, "rm %s %s", fname, fname2);
  91     system(command);
  92 }
  93 #endif
  94
  95 static void png_save2(const char *filename, uint32_t *bitmap, int w, int h)
  96 {
  97     int x, y, v;
  98     FILE *f;
  99     char fname[40], fname2[40];
 100     char command[1024];
 101
 102     snprintf(fname, 40, "%s.ppm", filename);
 103
 104     f = fopen(fname, "w");
 105     if (!f) {
 106         perror(fname);
 107         exit(1);
 108     }
 109     fprintf(f, "P6\n"
 110             "%d %d\n"
 111             "%d\n",
 112             w, h, 255);
 113     for(y = 0; y < h; y++) {
 114         for(x = 0; x < w; x++) {
 115             v = bitmap[y * w + x];
 116             putc((v >> 16) & 0xff, f);
 117             putc((v >> 8) & 0xff, f);
 118             putc((v >> 0) & 0xff, f);
 119         }
 120     }
 121     fclose(f);
 122
 123
 124     snprintf(fname2, 40, "%s-a.pgm", filename);
 125
 126     f = fopen(fname2, "w");
 127     if (!f) {
 128         perror(fname2);
 129         exit(1);
 130     }
 131     fprintf(f, "P5\n"
 132             "%d %d\n"
 133             "%d\n",
 134             w, h, 255);
 135     for(y = 0; y < h; y++) {
 136         for(x = 0; x < w; x++) {
 137             v = bitmap[y * w + x];
 138             putc((v >> 24) & 0xff, f);
 139         }
 140     }
 141     fclose(f);
 142
 143     snprintf(command, 1024, "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
 144     system(command);
 145
 146     snprintf(command, 1024, "rm %s %s", fname, fname2);
 147     system(command);
 148 }
 149 #endif
 150
 151 #define RGBA(r,g,b,a) (((a) << 24) | ((r) << 16) | ((g) << 8) | (b))
 152
 153 typedef struct DVBSubCLUT {
 154     int id;
 155
 156     uint32_t clut4[4];
 157     uint32_t clut16[16];
 158     uint32_t clut256[256];
 159
 160     struct DVBSubCLUT *next;
 161 } DVBSubCLUT;
 162
 163 static DVBSubCLUT default_clut;
 164
 165 typedef struct DVBSubObjectDisplay {
 166     int object_id;
 167     int region_id;
 168
 169     int x_pos;
 170     int y_pos;
 171
 172     int fgcolour;
 173     int bgcolour;
 174
 175     struct DVBSubObjectDisplay *region_list_next;
 176     struct DVBSubObjectDisplay *object_list_next;
 177 } DVBSubObjectDisplay;
 178
 179 typedef struct DVBSubObject {
 180     int id;
 181
 182     int type;
 183
 184     DVBSubObjectDisplay *display_list;
 185
 186     struct DVBSubObject *next;
 187 } DVBSubObject;
 188
 189 typedef struct DVBSubRegionDisplay {
 190     int region_id;
 191
 192     int x_pos;
 193     int y_pos;
 194
 195     struct DVBSubRegionDisplay *next;
 196 } DVBSubRegionDisplay;
 197
 198 typedef struct DVBSubRegion {
 199     int id;
 200
 201     int width;
 202     int height;
 203     int depth;
 204
 205     int clut;
 206     int bgcolour;
 207
 208     uint8_t *pbuf;
 209     int buf_size;
 210
 211     DVBSubObjectDisplay *display_list;
 212
 213     struct DVBSubRegion *next;
 214 } DVBSubRegion;
 215
 216 typedef struct DVBSubContext {
 217     int composition_id;
 218     int ancillary_id;
 219
 220     int time_out;
 221     DVBSubRegion *region_list;
 222     DVBSubCLUT   *clut_list;
 223     DVBSubObject *object_list;
 224
 225     int display_list_size;
 226     DVBSubRegionDisplay *display_list;
 227 } DVBSubContext;
 228
 229
 230 static DVBSubObject* get_object(DVBSubContext *ctx, int object_id)
 231 {
 232     DVBSubObject *ptr = ctx->object_list;
 233
 234     while (ptr != NULL && ptr->id != object_id) {
 235         ptr = ptr->next;
 236     }
 237
 238     return ptr;
 239 }
 240
 241 static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id)
 242 {
 243     DVBSubCLUT *ptr = ctx->clut_list;
 244
 245     while (ptr != NULL && ptr->id != clut_id) {
 246         ptr = ptr->next;
 247     }
 248
 249     return ptr;
 250 }
 251
 252 static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)
 253 {
 254     DVBSubRegion *ptr = ctx->region_list;
 255
 256     while (ptr != NULL && ptr->id != region_id) {
 257         ptr = ptr->next;
 258     }
 259
 260     return ptr;
 261 }
 262
 263 static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)
 264 {
 265     DVBSubObject *object, *obj2, **obj2_ptr;
 266     DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr;
 267
 268     while (region->display_list != NULL) {
 269         display = region->display_list;
 270
 271         object = get_object(ctx, display->object_id);
 272
 273         if (object != NULL) {
 274             obj_disp = object->display_list;
 275             obj_disp_ptr = &object->display_list;
 276
 277             while (obj_disp != NULL && obj_disp != display) {
 278                 obj_disp_ptr = &obj_disp->object_list_next;
 279                 obj_disp = obj_disp->object_list_next;
 280             }
 281
 282             if (obj_disp) {
 283                 *obj_disp_ptr = obj_disp->object_list_next;
 284
 285                 if (object->display_list == NULL) {
 286                     obj2 = ctx->object_list;
 287                     obj2_ptr = &ctx->object_list;
 288
 289                     while (obj2 != NULL && obj2 != object) {
 290                         obj2_ptr = &obj2->next;
 291                         obj2 = obj2->next;
 292                     }
 293
 294                     *obj2_ptr = obj2->next;
 295
 296                     av_free(obj2);
 297                 }
 298             }
 299         }
 300
 301         region->display_list = display->region_list_next;
 302
 303         av_free(display);
 304     }
 305
 306 }
 307
 308 static void delete_state(DVBSubContext *ctx)
 309 {
 310     DVBSubRegion *region;
 311     DVBSubCLUT *clut;
 312
 313     while (ctx->region_list != NULL)
 314     {
 315         region = ctx->region_list;
 316
 317         ctx->region_list = region->next;
 318
 319         delete_region_display_list(ctx, region);
 320         if (region->pbuf != NULL)
 321             av_free(region->pbuf);
 322
 323         av_free(region);
 324     }
 325
 326     while (ctx->clut_list != NULL)
 327     {
 328         clut = ctx->clut_list;
 329
 330         ctx->clut_list = clut->next;
 331
 332         av_free(clut);
 333     }
 334
 335     /* Should already be null */
 336     if (ctx->object_list != NULL)
 337         av_log(0, AV_LOG_ERROR, "Memory deallocation error!\n");
 338 }
 339
 340 static int dvbsub_init_decoder(AVCodecContext *avctx)
 341 {
 342     int i, r, g, b, a = 0;
 343     DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
 344
 345     cm = cropTbl + MAX_NEG_CROP;
 346
 347     memset(avctx->priv_data, 0, sizeof(DVBSubContext));
 348
 349     ctx->composition_id = avctx->sub_id & 0xffff;
 350     ctx->ancillary_id = avctx->sub_id >> 16;
 351
 352     default_clut.id = -1;
 353     default_clut.next = NULL;
 354
 355     default_clut.clut4[0] = RGBA(  0,   0,   0,   0);
 356     default_clut.clut4[1] = RGBA(255, 255, 255, 255);
 357     default_clut.clut4[2] = RGBA(  0,   0,   0, 255);
 358     default_clut.clut4[3] = RGBA(127, 127, 127, 255);
 359
 360     default_clut.clut16[0] = RGBA(  0,   0,   0,   0);
 361     for (i = 1; i < 16; i++) {
 362         if (i < 8) {
 363             r = (i & 1) ? 255 : 0;
 364             g = (i & 2) ? 255 : 0;
 365             b = (i & 4) ? 255 : 0;
 366         } else {
 367             r = (i & 1) ? 127 : 0;
 368             g = (i & 2) ? 127 : 0;
 369             b = (i & 4) ? 127 : 0;
 370         }
 371         default_clut.clut16[i] = RGBA(r, g, b, 255);
 372     }
 373
 374     default_clut.clut256[0] = RGBA(  0,   0,   0,   0);
 375     for (i = 1; i < 256; i++) {
 376         if (i < 8) {
 377             r = (i & 1) ? 255 : 0;
 378             g = (i & 2) ? 255 : 0;
 379             b = (i & 4) ? 255 : 0;
 380             a = 63;
 381         } else {
 382             switch (i & 0x88) {
 383             case 0x00:
 384                 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
 385                 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
 386                 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
 387                 a = 255;
 388                 break;
 389             case 0x08:
 390                 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
 391                 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
 392                 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
 393                 a = 127;
 394                 break;
 395             case 0x80:
 396                 r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
 397                 g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
 398                 b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
 399                 a = 255;
 400                 break;
 401             case 0x88:
 402                 r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
 403                 g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
 404                 b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
 405                 a = 255;
 406                 break;
 407             }
 408         }
 409         default_clut.clut256[i] = RGBA(r, g, b, a);
 410     }
 411
 412     return 0;
 413 }
 414
 415 static int dvbsub_close_decoder(AVCodecContext *avctx)
 416 {
 417     DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
 418     DVBSubRegionDisplay *display;
 419
 420     delete_state(ctx);
 421
 422     while (ctx->display_list != NULL)
 423     {
 424         display = ctx->display_list;
 425         ctx->display_list = display->next;
 426
 427         av_free(display);
 428     }
 429
 430     return 0;
 431 }
 432
 433 static int dvbsub_read_2bit_string(uint8_t *destbuf, int dbuf_len,
 434                                    uint8_t **srcbuf, int buf_size,
 435                                    int non_mod, uint8_t *map_table)
 436 {
 437     GetBitContext gb;
 438
 439     int bits;
 440     int run_length;
 441     int pixels_read = 0;
 442
 443     init_get_bits(&gb, *srcbuf, buf_size << 8);
 444
 445     while (get_bits_count(&gb) < (buf_size << 8) && pixels_read < dbuf_len) {
 446         bits = get_bits(&gb, 2);
 447
 448         if (bits != 0) {
 449             if (non_mod != 1 || bits != 1) {
 450                 if (map_table != NULL)
 451                     *destbuf++ = map_table[bits];
 452                 else
 453                     *destbuf++ = bits;
 454             }
 455             pixels_read++;
 456         } else {
 457             bits = get_bits(&gb, 1);
 458             if (bits == 1) {
 459                 run_length = get_bits(&gb, 3) + 3;
 460                 bits = get_bits(&gb, 2);
 461
 462                 if (non_mod == 1 && bits == 1)
 463                     pixels_read += run_length;
 464                 else {
 465                     if (map_table != NULL)
 466                         bits = map_table[bits];
 467                     while (run_length-- > 0 && pixels_read < dbuf_len) {
 468                         *destbuf++ = bits;
 469                         pixels_read++;
 470                     }
 471                 }
 472             } else {
 473                 bits = get_bits(&gb, 1);
 474                 if (bits == 0) {
 475                     bits = get_bits(&gb, 2);
 476                     if (bits == 2) {
 477                         run_length = get_bits(&gb, 4) + 12;
 478                         bits = get_bits(&gb, 2);
 479
 480                         if (non_mod == 1 && bits == 1)
 481                             pixels_read += run_length;
 482                         else {
 483                             if (map_table != NULL)
 484                                 bits = map_table[bits];
 485                             while (run_length-- > 0 && pixels_read < dbuf_len) {
 486                                 *destbuf++ = bits;
 487                                 pixels_read++;
 488                             }
 489                         }
 490                     } else if (bits == 3) {
 491                         run_length = get_bits(&gb, 8) + 29;
 492                         bits = get_bits(&gb, 2);
 493
 494                         if (non_mod == 1 && bits == 1)
 495                             pixels_read += run_length;
 496                         else {
 497                             if (map_table != NULL)
 498                                 bits = map_table[bits];
 499                             while (run_length-- > 0 && pixels_read < dbuf_len) {
 500                                 *destbuf++ = bits;
 501                                 pixels_read++;
 502                             }
 503                         }
 504                     } else if (bits == 1) {
 505                         pixels_read += 2;
 506                         if (map_table != NULL)
 507                             bits = map_table[0];
 508                         else
 509                             bits = 0;
 510                         if (pixels_read <= dbuf_len) {
 511                             *destbuf++ = bits;
 512                             *destbuf++ = bits;
 513                         }
 514                     } else {
 515                         (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
 516                         return pixels_read;
 517                     }
 518                 } else {
 519                     if (map_table != NULL)
 520                         bits = map_table[0];
 521                     else
 522                         bits = 0;
 523                     *destbuf++ = bits;
 524                     pixels_read++;
 525                 }
 526             }
 527         }
 528     }
 529
 530     if (get_bits(&gb, 6) != 0)
 531         av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
 532
 533     (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
 534
 535     return pixels_read;
 536 }
 537
 538 static int dvbsub_read_4bit_string(uint8_t *destbuf, int dbuf_len,
 539                                    uint8_t **srcbuf, int buf_size,
 540                                    int non_mod, uint8_t *map_table)
 541 {
 542     GetBitContext gb;
 543
 544     int bits;
 545     int run_length;
 546     int pixels_read = 0;
 547
 548     init_get_bits(&gb, *srcbuf, buf_size << 8);
 549
 550     while (get_bits_count(&gb) < (buf_size << 8) && pixels_read < dbuf_len) {
 551         bits = get_bits(&gb, 4);
 552
 553         if (bits != 0) {
 554             if (non_mod != 1 || bits != 1) {
 555                 if (map_table != NULL)
 556                     *destbuf++ = map_table[bits];
 557                 else
 558                     *destbuf++ = bits;
 559             }
 560             pixels_read++;
 561         } else {
 562             bits = get_bits(&gb, 1);
 563             if (bits == 0) {
 564                 run_length = get_bits(&gb, 3);
 565
 566                 if (run_length == 0) {
 567                     (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
 568                     return pixels_read;
 569                 }
 570
 571                 run_length += 2;
 572
 573                 if (map_table != NULL)
 574                     bits = map_table[0];
 575                 else
 576                     bits = 0;
 577
 578                 while (run_length-- > 0 && pixels_read < dbuf_len) {
 579                     *destbuf++ = bits;
 580                     pixels_read++;
 581                 }
 582             } else {
 583                 bits = get_bits(&gb, 1);
 584                 if (bits == 0) {
 585                     run_length = get_bits(&gb, 2) + 4;
 586                     bits = get_bits(&gb, 4);
 587
 588                     if (non_mod == 1 && bits == 1)
 589                         pixels_read += run_length;
 590                     else {
 591                         if (map_table != NULL)
 592                             bits = map_table[bits];
 593                         while (run_length-- > 0 && pixels_read < dbuf_len) {
 594                             *destbuf++ = bits;
 595                             pixels_read++;
 596                         }
 597                     }
 598                 } else {
 599                     bits = get_bits(&gb, 2);
 600                     if (bits == 2) {
 601                         run_length = get_bits(&gb, 4) + 9;
 602                         bits = get_bits(&gb, 4);
 603
 604                         if (non_mod == 1 && bits == 1)
 605                             pixels_read += run_length;
 606                         else {
 607                             if (map_table != NULL)
 608                                 bits = map_table[bits];
 609                             while (run_length-- > 0 && pixels_read < dbuf_len) {
 610                                 *destbuf++ = bits;
 611                                 pixels_read++;
 612                             }
 613                         }
 614                     } else if (bits == 3) {
 615                         run_length = get_bits(&gb, 8) + 25;
 616                         bits = get_bits(&gb, 4);
 617
 618                         if (non_mod == 1 && bits == 1)
 619                             pixels_read += run_length;
 620                         else {
 621                             if (map_table != NULL)
 622                                 bits = map_table[bits];
 623                             while (run_length-- > 0 && pixels_read < dbuf_len) {
 624                                 *destbuf++ = bits;
 625                                 pixels_read++;
 626                             }
 627                         }
 628                     } else if (bits == 1) {
 629                         pixels_read += 2;
 630                         if (map_table != NULL)
 631                             bits = map_table[0];
 632                         else
 633                             bits = 0;
 634                         if (pixels_read <= dbuf_len) {
 635                             *destbuf++ = bits;
 636                             *destbuf++ = bits;
 637                         }
 638                     } else {
 639                         if (map_table != NULL)
 640                             bits = map_table[0];
 641                         else
 642                             bits = 0;
 643                         *destbuf++ = bits;
 644                         pixels_read ++;
 645                     }
 646                 }
 647             }
 648         }
 649     }
 650
 651     if (get_bits(&gb, 8) != 0)
 652         av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
 653
 654     (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
 655
 656     return pixels_read;
 657 }
 658
 659 static int dvbsub_read_8bit_string(uint8_t *destbuf, int dbuf_len,
 660                                     uint8_t **srcbuf, int buf_size,
 661                                     int non_mod, uint8_t *map_table)
 662 {
 663     uint8_t *sbuf_end = (*srcbuf) + buf_size;
 664     int bits;
 665     int run_length;
 666     int pixels_read = 0;
 667
 668     while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
 669         bits = *(*srcbuf)++;
 670
 671         if (bits != 0) {
 672             if (non_mod != 1 || bits != 1) {
 673                 if (map_table != NULL)
 674                     *destbuf++ = map_table[bits];
 675                 else
 676                     *destbuf++ = bits;
 677             }
 678             pixels_read++;
 679         } else {
 680             bits = *(*srcbuf)++;
 681             run_length = bits & 0x7f;
 682             if ((bits & 0x80) == 0) {
 683                 if (run_length == 0) {
 684                     return pixels_read;
 685                 }
 686
 687                 if (map_table != NULL)
 688                     bits = map_table[0];
 689                 else
 690                     bits = 0;
 691                 while (run_length-- > 0 && pixels_read < dbuf_len) {
 692                     *destbuf++ = bits;
 693                     pixels_read++;
 694                 }
 695             } else {
 696                 bits = *(*srcbuf)++;
 697
 698                 if (non_mod == 1 && bits == 1)
 699                     pixels_read += run_length;
 700                 if (map_table != NULL)
 701                     bits = map_table[bits];
 702                 else while (run_length-- > 0 && pixels_read < dbuf_len) {
 703                     *destbuf++ = bits;
 704                     pixels_read++;
 705                 }
 706             }
 707         }
 708     }
 709
 710     if (*(*srcbuf)++ != 0)
 711         av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
 712
 713     return pixels_read;
 714 }
 715
 716
 717
 718 static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,
 719                                           uint8_t *buf, int buf_size, int top_bottom, int non_mod)
 720 {
 721     DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
 722
 723     DVBSubRegion *region = get_region(ctx, display->region_id);
 724     uint8_t *buf_end = buf + buf_size;
 725     uint8_t *pbuf;
 726     int x_pos, y_pos;
 727     int i;
 728
 729     uint8_t map2to4[] = { 0x0,  0x7,  0x8,  0xf};
 730     uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
 731     uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
 732                          0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
 733     uint8_t *map_table;
 734
 735 #ifdef DEBUG
 736     av_log(avctx, AV_LOG_INFO, "DVB pixel block size %d, %s field:\n", buf_size,
 737                 top_bottom ? "bottom" : "top");
 738 #endif
 739
 740 #ifdef DEBUG_PACKET_CONTENTS
 741     for (i = 0; i < buf_size; i++)
 742     {
 743         if (i % 16 == 0)
 744             av_log(avctx, AV_LOG_INFO, "0x%08p: ", buf+i);
 745
 746         av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);
 747         if (i % 16 == 15)
 748             av_log(avctx, AV_LOG_INFO, "\n");
 749     }
 750
 751     if (i % 16 != 0)
 752         av_log(avctx, AV_LOG_INFO, "\n");
 753
 754 #endif
 755
 756     if (region == 0)
 757         return;
 758
 759     pbuf = region->pbuf;
 760
 761     x_pos = display->x_pos;
 762     y_pos = display->y_pos;
 763
 764     if ((y_pos & 1) != top_bottom)
 765         y_pos++;
 766
 767     while (buf < buf_end) {
 768         if (x_pos > region->width || y_pos > region->height) {
 769             av_log(avctx, AV_LOG_ERROR, "Invalid object location!\n");
 770             return;
 771         }
 772
 773         switch (*buf++) {
 774         case 0x10:
 775             if (region->depth == 8)
 776                 map_table = map2to8;
 777             else if (region->depth == 4)
 778                 map_table = map2to4;
 779             else
 780                 map_table = NULL;
 781
 782             x_pos += dvbsub_read_2bit_string(pbuf + (y_pos * region->width) + x_pos,
 783                                                 region->width - x_pos, &buf, buf_size,
 784                                                 non_mod, map_table);
 785             break;
 786         case 0x11:
 787             if (region->depth < 4) {
 788                 av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
 789                 return;
 790             }
 791
 792             if (region->depth == 8)
 793                 map_table = map4to8;
 794             else
 795                 map_table = NULL;
 796
 797             x_pos += dvbsub_read_4bit_string(pbuf + (y_pos * region->width) + x_pos,
 798                                                 region->width - x_pos, &buf, buf_size,
 799                                                 non_mod, map_table);
 800             break;
 801         case 0x12:
 802             if (region->depth < 8) {
 803                 av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
 804                 return;
 805             }
 806
 807             x_pos += dvbsub_read_8bit_string(pbuf + (y_pos * region->width) + x_pos,
 808                                                 region->width - x_pos, &buf, buf_size,
 809                                                 non_mod, NULL);
 810             break;
 811
 812         case 0x20:
 813             map2to4[0] = (*buf) >> 4;
 814             map2to4[1] = (*buf++) & 0xf;
 815             map2to4[2] = (*buf) >> 4;
 816             map2to4[3] = (*buf++) & 0xf;
 817             break;
 818         case 0x21:
 819             for (i = 0; i < 4; i++)
 820                 map2to8[i] = *buf++;
 821             break;
 822         case 0x22:
 823             for (i = 0; i < 16; i++)
 824                 map4to8[i] = *buf++;
 825             break;
 826
 827         case 0xf0:
 828             x_pos = display->x_pos;
 829             y_pos += 2;
 830             break;
 831         default:
 832             av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
 833         }
 834     }
 835
 836 }
 837
 838 static void dvbsub_parse_object_segment(AVCodecContext *avctx,
 839                                         uint8_t *buf, int buf_size)
 840 {
 841     DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
 842
 843     uint8_t *buf_end = buf + buf_size;
 844     uint8_t *block;
 845     int object_id;
 846     DVBSubObject *object;
 847     DVBSubObjectDisplay *display;
 848     int top_field_len, bottom_field_len;
 849
 850     int coding_method, non_modifying_colour;
 851
 852     object_id = BE_16(buf);
 853     buf += 2;
 854
 855     object = get_object(ctx, object_id);
 856
 857     if (!object)
 858         return;
 859
 860     coding_method = ((*buf) >> 2) & 3;
 861     non_modifying_colour = ((*buf++) >> 1) & 1;
 862
 863     if (coding_method == 0) {
 864         top_field_len = BE_16(buf);
 865         buf += 2;
 866         bottom_field_len = BE_16(buf);
 867         buf += 2;
 868
 869         if (buf + top_field_len + bottom_field_len > buf_end) {
 870             av_log(avctx, AV_LOG_ERROR, "Field data size too large\n");
 871             return;
 872         }
 873
 874         for (display = object->display_list; display != 0; display = display->object_list_next) {
 875             block = buf;
 876
 877             dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
 878                                             non_modifying_colour);
 879
 880             if (bottom_field_len > 0)
 881                 block = buf + top_field_len;
 882             else
 883                 bottom_field_len = top_field_len;
 884
 885             dvbsub_parse_pixel_data_block(avctx, display, block, bottom_field_len, 1,
 886                                             non_modifying_colour);
 887         }
 888
 889 /*  } else if (coding_method == 1) {*/
 890
 891     } else {
 892         av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
 893     }
 894
 895 }
 896
 897 #define SCALEBITS 10
 898 #define ONE_HALF  (1 << (SCALEBITS - 1))
 899 #define FIX(x)    ((int) ((x) * (1<<SCALEBITS) + 0.5))
 900
 901 #define YUV_TO_RGB1_CCIR(cb1, cr1)\
 902 {\
 903     cb = (cb1) - 128;\
 904     cr = (cr1) - 128;\
 905     r_add = FIX(1.40200*255.0/224.0) * cr + ONE_HALF;\
 906     g_add = - FIX(0.34414*255.0/224.0) * cb - FIX(0.71414*255.0/224.0) * cr + \
 907             ONE_HALF;\
 908     b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;\
 909 }
 910
 911 #define YUV_TO_RGB2_CCIR(r, g, b, y1)\
 912 {\
 913     y = ((y1) - 16) * FIX(255.0/219.0);\
 914     r = cm[(y + r_add) >> SCALEBITS];\
 915     g = cm[(y + g_add) >> SCALEBITS];\
 916     b = cm[(y + b_add) >> SCALEBITS];\
 917 }
 918
 919
 920 static void dvbsub_parse_clut_segment(AVCodecContext *avctx,
 921                                         uint8_t *buf, int buf_size)
 922 {
 923     DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
 924
 925     uint8_t *buf_end = buf + buf_size;
 926     int clut_id;
 927     DVBSubCLUT *clut;
 928     int entry_id, depth , full_range;
 929     int y, cr, cb, alpha;
 930     int r, g, b, r_add, g_add, b_add;
 931
 932 #ifdef DEBUG_PACKET_CONTENTS
 933     int i;
 934
 935     av_log(avctx, AV_LOG_INFO, "DVB clut packet:\n");
 936
 937     for (i=0; i < buf_size; i++)
 938     {
 939         av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);
 940         if (i % 16 == 15)
 941             av_log(avctx, AV_LOG_INFO, "\n");
 942     }
 943
 944     if (i % 16 != 0)
 945         av_log(avctx, AV_LOG_INFO, "\n");
 946
 947 #endif
 948
 949     clut_id = *buf++;
 950     buf += 1;
 951
 952     clut = get_clut(ctx, clut_id);
 953
 954     if (clut == NULL) {
 955         clut = av_malloc(sizeof(DVBSubCLUT));
 956
 957         memcpy(clut, &default_clut, sizeof(DVBSubCLUT));
 958
 959         clut->id = clut_id;
 960
 961         clut->next = ctx->clut_list;
 962         ctx->clut_list = clut;
 963     }
 964
 965     while (buf + 4 < buf_end)
 966     {
 967         entry_id = *buf++;
 968
 969         depth = (*buf) & 0xe0;
 970
 971         if (depth == 0) {
 972             av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
 973             return;
 974         }
 975
 976         full_range = (*buf++) & 1;
 977
 978         if (full_range) {
 979             y = *buf++;
 980             cr = *buf++;
 981             cb = *buf++;
 982             alpha = *buf++;
 983         } else {
 984             y = buf[0] & 0xfc;
 985             cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
 986             cb = (buf[1] << 2) & 0xf0;
 987             alpha = (buf[1] << 6) & 0xc0;
 988
 989             buf += 2;
 990         }
 991
 992         if (y == 0)
 993             alpha = 0xff;
 994
 995         YUV_TO_RGB1_CCIR(cb, cr);
 996         YUV_TO_RGB2_CCIR(r, g, b, y);
 997
 998 #ifdef DEBUG
 999         av_log(avctx, AV_LOG_INFO, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
1000 #endif
1001
1002         if (depth & 0x80)
1003             clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
1004         if (depth & 0x40)
1005             clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
1006         if (depth & 0x20)
1007             clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
1008     }
1009 }
1010
1011
1012 static void dvbsub_parse_region_segment(AVCodecContext *avctx,
1013                                         uint8_t *buf, int buf_size)
1014 {
1015     DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
1016
1017     uint8_t *buf_end = buf + buf_size;
1018     int region_id, object_id;
1019     DVBSubRegion *region;
1020     DVBSubObject *object;
1021     DVBSubObjectDisplay *display;
1022     int fill;
1023
1024     if (buf_size < 10)
1025         return;
1026
1027     region_id = *buf++;
1028
1029     region = get_region(ctx, region_id);
1030
1031     if (region == NULL)
1032     {
1033         region = av_mallocz(sizeof(DVBSubRegion));
1034
1035         region->id = region_id;
1036
1037         region->next = ctx->region_list;
1038         ctx->region_list = region;
1039     }
1040
1041     fill = ((*buf++) >> 3) & 1;
1042
1043     region->width = BE_16(buf);
1044     buf += 2;
1045     region->height = BE_16(buf);
1046     buf += 2;
1047
1048     if (region->width * region->height != region->buf_size) {
1049         if (region->pbuf != 0)
1050             av_free(region->pbuf);
1051
1052         region->buf_size = region->width * region->height;
1053
1054         region->pbuf = av_malloc(region->buf_size);
1055
1056         fill = 1;
1057     }
1058
1059     region->depth = 1 << (((*buf++) >> 2) & 7);
1060     region->clut = *buf++;
1061
1062     if (region->depth == 8)
1063         region->bgcolour = *buf++;
1064     else {
1065         buf += 1;
1066
1067         if (region->depth == 4)
1068             region->bgcolour = (((*buf++) >> 4) & 15);
1069         else
1070             region->bgcolour = (((*buf++) >> 2) & 3);
1071     }
1072
1073 #ifdef DEBUG
1074     av_log(avctx, AV_LOG_INFO, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
1075 #endif
1076
1077     if (fill) {
1078         memset(region->pbuf, region->bgcolour, region->buf_size);
1079 #ifdef DEBUG
1080         av_log(avctx, AV_LOG_INFO, "Fill region (%d)\n", region->bgcolour);
1081 #endif
1082     }
1083
1084     delete_region_display_list(ctx, region);
1085
1086     while (buf + 5 < buf_end) {
1087         object_id = BE_16(buf);
1088         buf += 2;
1089
1090         object = get_object(ctx, object_id);
1091
1092         if (object == NULL) {
1093             object = av_mallocz(sizeof(DVBSubObject));
1094
1095             object->id = object_id;
1096             object->next = ctx->object_list;
1097             ctx->object_list = object;
1098         }
1099
1100         object->type = (*buf) >> 6;
1101
1102         display = av_mallocz(sizeof(DVBSubObjectDisplay));
1103
1104         display->object_id = object_id;
1105         display->region_id = region_id;
1106
1107         display->x_pos = BE_16(buf) & 0xfff;
1108         buf += 2;
1109         display->y_pos = BE_16(buf) & 0xfff;
1110         buf += 2;
1111
1112         if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
1113             display->fgcolour = *buf++;
1114             display->bgcolour = *buf++;
1115         }
1116
1117         display->region_list_next = region->display_list;
1118         region->display_list = display;
1119
1120         display->object_list_next = object->display_list;
1121         object->display_list = display;
1122     }
1123 }
1124
1125 static void dvbsub_parse_page_segment(AVCodecContext *avctx,
1126                                         uint8_t *buf, int buf_size)
1127 {
1128     DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
1129     DVBSubRegionDisplay *display;
1130     DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
1131
1132     uint8_t *buf_end = buf + buf_size;
1133     int region_id;
1134     int page_state;
1135
1136     if (buf_size < 1)
1137         return;
1138
1139     ctx->time_out = *buf++;
1140     page_state = ((*buf++) >> 2) & 3;
1141
1142 #ifdef DEBUG
1143     av_log(avctx, AV_LOG_INFO, "Page time out %ds, state %d\n", ctx->time_out, page_state);
1144 #endif
1145
1146     if (page_state == 2)
1147     {
1148         delete_state(ctx);
1149     }
1150
1151     tmp_display_list = ctx->display_list;
1152     ctx->display_list = NULL;
1153     ctx->display_list_size = 0;
1154
1155     while (buf + 5 < buf_end) {
1156         region_id = *buf++;
1157         buf += 1;
1158
1159         display = tmp_display_list;
1160         tmp_ptr = &tmp_display_list;
1161
1162         while (display != NULL && display->region_id != region_id) {
1163             tmp_ptr = &display->next;
1164             display = display->next;
1165         }
1166
1167         if (display == NULL)
1168             display = av_mallocz(sizeof(DVBSubRegionDisplay));
1169
1170         display->region_id = region_id;
1171
1172         display->x_pos = BE_16(buf);
1173         buf += 2;
1174         display->y_pos = BE_16(buf);
1175         buf += 2;
1176
1177         *tmp_ptr = display->next;
1178
1179         display->next = ctx->display_list;
1180         ctx->display_list = display;
1181         ctx->display_list_size++;
1182
1183 #ifdef DEBUG
1184         av_log(avctx, AV_LOG_INFO, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
1185 #endif
1186     }
1187
1188     while (tmp_display_list != 0) {
1189         display = tmp_display_list;
1190
1191         tmp_display_list = display->next;
1192
1193         av_free(display);
1194     }
1195
1196 }
1197
1198
1199 #ifdef DEBUG_SAVE_IMAGES
1200 static void save_display_set(DVBSubContext *ctx)
1201 {
1202     DVBSubRegion *region;
1203     DVBSubRegionDisplay *display;
1204     DVBSubCLUT *clut;
1205     uint32_t *clut_table;
1206     int x_pos, y_pos, width, height;
1207     int x, y, y_off, x_off;
1208     uint32_t *pbuf;
1209     char filename[32];
1210     static int fileno_index = 0;
1211
1212     x_pos = -1;
1213     y_pos = -1;
1214     width = 0;
1215     height = 0;
1216
1217     for (display = ctx->display_list; display != NULL; display = display->next) {
1218         region = get_region(ctx, display->region_id);
1219
1220         if (x_pos == -1) {
1221             x_pos = display->x_pos;
1222             y_pos = display->y_pos;
1223             width = region->width;
1224             height = region->height;
1225         } else {
1226             if (display->x_pos < x_pos) {
1227                 width += (x_pos - display->x_pos);
1228                 x_pos = display->x_pos;
1229             }
1230
1231             if (display->y_pos < y_pos) {
1232                 height += (y_pos - display->y_pos);
1233                 y_pos = display->y_pos;
1234             }
1235
1236             if (display->x_pos + region->width > x_pos + width) {
1237                 width = display->x_pos + region->width - x_pos;
1238             }
1239
1240             if (display->y_pos + region->height > y_pos + height) {
1241                 height = display->y_pos + region->height - y_pos;
1242             }
1243         }
1244     }
1245
1246     if (x_pos >= 0) {
1247
1248         pbuf = av_malloc(width * height * 4);
1249
1250         for (display = ctx->display_list; display != NULL; display = display->next) {
1251             region = get_region(ctx, display->region_id);
1252
1253             x_off = display->x_pos - x_pos;
1254             y_off = display->y_pos - y_pos;
1255
1256             clut = get_clut(ctx, region->clut);
1257
1258             if (clut == 0)
1259                 clut = &default_clut;
1260
1261             switch (region->depth) {
1262             case 2:
1263                 clut_table = clut->clut4;
1264                 break;
1265             case 8:
1266                 clut_table = clut->clut256;
1267                 break;
1268             case 4:
1269             default:
1270                 clut_table = clut->clut16;
1271                 break;
1272             }
1273
1274             for (y = 0; y < region->height; y++) {
1275                 for (x = 0; x < region->width; x++) {
1276                     pbuf[((y + y_off) * width) + x_off + x] =
1277                         clut_table[region->pbuf[y * region->width + x]];
1278                 }
1279             }
1280
1281         }
1282
1283         snprintf(filename, 32, "dvbs.%d", fileno_index);
1284
1285         png_save2(filename, pbuf, width, height);
1286
1287         av_free(pbuf);
1288     }
1289
1290     fileno_index++;
1291 }
1292 #endif
1293
1294 static int dvbsub_display_end_segment(AVCodecContext *avctx, uint8_t *buf,
1295                                         int buf_size, AVSubtitle *sub)
1296 {
1297     DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
1298
1299     DVBSubRegion *region;
1300     DVBSubRegionDisplay *display;
1301     AVSubtitleRect *rect;
1302     DVBSubCLUT *clut;
1303     uint32_t *clut_table;
1304     int i;
1305
1306     sub->rects = NULL;
1307     sub->start_display_time = 0;
1308     sub->end_display_time = ctx->time_out * 1000;
1309     sub->format = 0;
1310
1311     sub->num_rects = ctx->display_list_size;
1312
1313     if (sub->num_rects == 0)
1314         return 0;
1315
1316     sub->rects = av_mallocz(sizeof(AVSubtitleRect) * sub->num_rects);
1317
1318     i = 0;
1319
1320     for (display = ctx->display_list; display != NULL; display = display->next) {
1321         region = get_region(ctx, display->region_id);
1322         rect = &sub->rects[i];
1323
1324         if (region == NULL)
1325             continue;
1326
1327         rect->x = display->x_pos;
1328         rect->y = display->y_pos;
1329         rect->w = region->width;
1330         rect->h = region->height;
1331         rect->nb_colors = 16;
1332         rect->linesize = region->width;
1333
1334         clut = get_clut(ctx, region->clut);
1335
1336         if (clut == NULL)
1337             clut = &default_clut;
1338
1339         switch (region->depth) {
1340         case 2:
1341             clut_table = clut->clut4;
1342             break;
1343         case 8:
1344             clut_table = clut->clut256;
1345             break;
1346         case 4:
1347         default:
1348             clut_table = clut->clut16;
1349             break;
1350         }
1351
1352         rect->rgba_palette = av_malloc((1 << region->depth) * sizeof(uint32_t));
1353         memcpy(rect->rgba_palette, clut_table, (1 << region->depth) * sizeof(uint32_t));
1354
1355         rect->bitmap = av_malloc(region->buf_size);
1356         memcpy(rect->bitmap, region->pbuf, region->buf_size);
1357
1358         i++;
1359     }
1360
1361     sub->num_rects = i;
1362
1363 #ifdef DEBUG_SAVE_IMAGES
1364     save_display_set(ctx);
1365 #endif
1366
1367     return 1;
1368 }
1369
1370 static int dvbsub_decode(AVCodecContext *avctx,
1371                          void *data, int *data_size,
1372                          uint8_t *buf, int buf_size)
1373 {
1374     DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
1375     AVSubtitle *sub = (AVSubtitle*) data;
1376     uint8_t *p, *p_end;
1377     int segment_type;
1378     int page_id;
1379     int segment_length;
1380
1381 #ifdef DEBUG_PACKET_CONTENTS
1382     int i;
1383
1384     av_log(avctx, AV_LOG_INFO, "DVB sub packet:\n");
1385
1386     for (i=0; i < buf_size; i++)
1387     {
1388         av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);
1389         if (i % 16 == 15)
1390             av_log(avctx, AV_LOG_INFO, "\n");
1391     }
1392
1393     if (i % 16 != 0)
1394         av_log(avctx, AV_LOG_INFO, "\n");
1395
1396 #endif
1397
1398     if (buf_size <= 2)
1399         return -1;
1400
1401     p = buf;
1402     p_end = buf + buf_size;
1403
1404     while (p < p_end && *p == 0x0f)
1405     {
1406         p += 1;
1407         segment_type = *p++;
1408         page_id = BE_16(p);
1409         p += 2;
1410         segment_length = BE_16(p);
1411         p += 2;
1412
1413         if (page_id == ctx->composition_id || page_id == ctx->ancillary_id) {
1414             switch (segment_type) {
1415             case DVBSUB_PAGE_SEGMENT:
1416                 dvbsub_parse_page_segment(avctx, p, segment_length);
1417                 break;
1418             case DVBSUB_REGION_SEGMENT:
1419                 dvbsub_parse_region_segment(avctx, p, segment_length);
1420                 break;
1421             case DVBSUB_CLUT_SEGMENT:
1422                 dvbsub_parse_clut_segment(avctx, p, segment_length);
1423                 break;
1424             case DVBSUB_OBJECT_SEGMENT:
1425                 dvbsub_parse_object_segment(avctx, p, segment_length);
1426                 break;
1427             case DVBSUB_DISPLAY_SEGMENT:
1428                 *data_size = dvbsub_display_end_segment(avctx, p, segment_length, sub);
1429                 break;
1430             default:
1431 #ifdef DEBUG
1432                 av_log(avctx, AV_LOG_INFO, "Subtitling segment type 0x%x, page id %d, length %d\n",
1433                         segment_type, page_id, segment_length);
1434 #endif
1435                 break;
1436             }
1437         }
1438
1439         p += segment_length;
1440     }
1441
1442     if (p != p_end)
1443     {
1444 #ifdef DEBUG
1445         av_log(avctx, AV_LOG_INFO, "Junk at end of packet\n");
1446 #endif
1447         return -1;
1448     }
1449
1450     return 0;
1451 }
1452
1453
1454 AVCodec dvbsub_decoder = {
1455     "dvbsub",
1456     CODEC_TYPE_SUBTITLE,
1457     CODEC_ID_DVB_SUBTITLE,
1458     sizeof(DVBSubContext),
1459     dvbsub_init_decoder,
1460     NULL,
1461     dvbsub_close_decoder,
1462     dvbsub_decode,
1463 };
1464
1465 /* Parser (mostly) copied from dvdsub.c */
1466
1467 #define PARSE_BUF_SIZE  (65536)
1468
1469
1470 /* parser definition */
1471 typedef struct DVBSubParseContext {
1472     uint8_t *packet_buf;
1473     int packet_start;
1474     int packet_index;
1475     int in_packet;
1476 } DVBSubParseContext;
1477
1478 static int dvbsub_parse_init(AVCodecParserContext *s)
1479 {
1480     DVBSubParseContext *pc = s->priv_data;
1481     pc->packet_buf = av_malloc(PARSE_BUF_SIZE);
1482
1483     return 0;
1484 }
1485
1486 static int dvbsub_parse(AVCodecParserContext *s,
1487                         AVCodecContext *avctx,
1488                         uint8_t **poutbuf, int *poutbuf_size,
1489                         const uint8_t *buf, int buf_size)
1490 {
1491     DVBSubParseContext *pc = s->priv_data;
1492     uint8_t *p, *p_end;
1493     int len, buf_pos = 0;
1494
1495 #ifdef DEBUG
1496     av_log(avctx, AV_LOG_INFO, "DVB parse packet pts=%Lx, lpts=%Lx, cpts=%Lx:\n",
1497             s->pts, s->last_pts, s->cur_frame_pts[s->cur_frame_start_index]);
1498 #endif
1499
1500 #ifdef DEBUG_PACKET_CONTENTS
1501     int i;
1502
1503     for (i=0; i < buf_size; i++)
1504     {
1505         av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);
1506         if (i % 16 == 15)
1507             av_log(avctx, AV_LOG_INFO, "\n");
1508     }
1509
1510     if (i % 16 != 0)
1511         av_log(avctx, AV_LOG_INFO, "\n");
1512
1513 #endif
1514
1515     *poutbuf = NULL;
1516     *poutbuf_size = 0;
1517
1518     s->fetch_timestamp = 1;
1519
1520     if (s->last_pts != s->pts && s->last_pts != AV_NOPTS_VALUE) /* Start of a new packet */
1521     {
1522         if (pc->packet_index != pc->packet_start)
1523         {
1524 #ifdef DEBUG
1525             av_log(avctx, AV_LOG_INFO, "Discarding %d bytes\n",
1526                 pc->packet_index - pc->packet_start);
1527 #endif
1528         }
1529
1530         pc->packet_start = 0;
1531         pc->packet_index = 0;
1532
1533         if (buf_size < 2 || buf[0] != 0x20 || buf[1] != 0x00) {
1534 #ifdef DEBUG
1535             av_log(avctx, AV_LOG_INFO, "Bad packet header\n");
1536 #endif
1537             return -1;
1538         }
1539
1540         buf_pos = 2;
1541
1542         pc->in_packet = 1;
1543     } else {
1544         if (pc->packet_start != 0)
1545         {
1546             if (pc->packet_index != pc->packet_start)
1547             {
1548                 memmove(pc->packet_buf, pc->packet_buf + pc->packet_start,
1549                             pc->packet_index - pc->packet_start);
1550
1551                 pc->packet_index -= pc->packet_start;
1552                 pc->packet_start = 0;
1553             } else {
1554                 pc->packet_start = 0;
1555                 pc->packet_index = 0;
1556             }
1557         }
1558     }
1559
1560     if (buf_size - buf_pos + pc->packet_index > PARSE_BUF_SIZE)
1561         return -1;
1562
1563 /* if not currently in a packet, discard data */
1564     if (pc->in_packet == 0)
1565         return buf_size;
1566
1567     memcpy(pc->packet_buf + pc->packet_index, buf + buf_pos, buf_size - buf_pos);
1568     pc->packet_index += buf_size - buf_pos;
1569
1570     p = pc->packet_buf;
1571     p_end = pc->packet_buf + pc->packet_index;
1572
1573     while (p < p_end)
1574     {
1575         if (*p == 0x0f)
1576         {
1577             if (p + 6 <= p_end)
1578             {
1579                 len = BE_16(p + 4);
1580
1581                 if (p + len + 6 <= p_end)
1582                 {
1583                     *poutbuf_size += len + 6;
1584
1585                     p += len + 6;
1586                 } else
1587                     break;
1588             } else
1589                 break;
1590         } else if (*p == 0xff) {
1591             if (p + 1 < p_end)
1592             {
1593 #ifdef DEBUG
1594                 av_log(avctx, AV_LOG_INFO, "Junk at end of packet\n");
1595 #endif
1596             }
1597             pc->packet_index = p - pc->packet_buf;
1598             pc->in_packet = 0;
1599             break;
1600         } else {
1601             av_log(avctx, AV_LOG_ERROR, "Junk in packet\n");
1602
1603             pc->packet_index = p - pc->packet_buf;
1604             pc->in_packet = 0;
1605             break;
1606         }
1607     }
1608
1609     if (*poutbuf_size > 0)
1610     {
1611         *poutbuf = pc->packet_buf;
1612         pc->packet_start = *poutbuf_size;
1613     }
1614
1615     if (s->last_pts == AV_NOPTS_VALUE)
1616         s->last_pts = s->pts;
1617
1618     return buf_size;
1619 }
1620
1621 static void dvbsub_parse_close(AVCodecParserContext *s)
1622 {
1623     DVBSubParseContext *pc = s->priv_data;
1624     av_freep(&pc->packet_buf);
1625 }
1626
1627 AVCodecParser dvbsub_parser = {
1628     { CODEC_ID_DVB_SUBTITLE },
1629     sizeof(DVBSubParseContext),
1630     dvbsub_parse_init,
1631     dvbsub_parse,
1632     dvbsub_parse_close,
1633 };