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libavcodec/dvbsubdec.c

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00001 /*
00002  * DVB subtitle decoding
00003  * Copyright (c) 2005 Ian Caulfield
00004  *
00005  * This file is part of Libav.
00006  *
00007  * Libav is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * Libav is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with Libav; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 #include "avcodec.h"
00022 #include "dsputil.h"
00023 #include "get_bits.h"
00024 #include "bytestream.h"
00025 #include "libavutil/colorspace.h"
00026 
00027 #define DVBSUB_PAGE_SEGMENT     0x10
00028 #define DVBSUB_REGION_SEGMENT   0x11
00029 #define DVBSUB_CLUT_SEGMENT     0x12
00030 #define DVBSUB_OBJECT_SEGMENT   0x13
00031 #define DVBSUB_DISPLAYDEFINITION_SEGMENT 0x14
00032 #define DVBSUB_DISPLAY_SEGMENT  0x80
00033 
00034 #define cm (ff_cropTbl + MAX_NEG_CROP)
00035 
00036 #ifdef DEBUG
00037 #undef fprintf
00038 #undef perror
00039 #if 0
00040 static void png_save(const char *filename, uint8_t *bitmap, int w, int h,
00041                      uint32_t *rgba_palette)
00042 {
00043     int x, y, v;
00044     FILE *f;
00045     char fname[40], fname2[40];
00046     char command[1024];
00047 
00048     snprintf(fname, 40, "%s.ppm", filename);
00049 
00050     f = fopen(fname, "w");
00051     if (!f) {
00052         perror(fname);
00053         return;
00054     }
00055     fprintf(f, "P6\n"
00056             "%d %d\n"
00057             "%d\n",
00058             w, h, 255);
00059     for(y = 0; y < h; y++) {
00060         for(x = 0; x < w; x++) {
00061             v = rgba_palette[bitmap[y * w + x]];
00062             putc((v >> 16) & 0xff, f);
00063             putc((v >> 8) & 0xff, f);
00064             putc((v >> 0) & 0xff, f);
00065         }
00066     }
00067     fclose(f);
00068 
00069 
00070     snprintf(fname2, 40, "%s-a.pgm", filename);
00071 
00072     f = fopen(fname2, "w");
00073     if (!f) {
00074         perror(fname2);
00075         return;
00076     }
00077     fprintf(f, "P5\n"
00078             "%d %d\n"
00079             "%d\n",
00080             w, h, 255);
00081     for(y = 0; y < h; y++) {
00082         for(x = 0; x < w; x++) {
00083             v = rgba_palette[bitmap[y * w + x]];
00084             putc((v >> 24) & 0xff, f);
00085         }
00086     }
00087     fclose(f);
00088 
00089     snprintf(command, 1024, "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
00090     system(command);
00091 
00092     snprintf(command, 1024, "rm %s %s", fname, fname2);
00093     system(command);
00094 }
00095 #endif
00096 
00097 static void png_save2(const char *filename, uint32_t *bitmap, int w, int h)
00098 {
00099     int x, y, v;
00100     FILE *f;
00101     char fname[40], fname2[40];
00102     char command[1024];
00103 
00104     snprintf(fname, sizeof(fname), "%s.ppm", filename);
00105 
00106     f = fopen(fname, "w");
00107     if (!f) {
00108         perror(fname);
00109         return;
00110     }
00111     fprintf(f, "P6\n"
00112             "%d %d\n"
00113             "%d\n",
00114             w, h, 255);
00115     for(y = 0; y < h; y++) {
00116         for(x = 0; x < w; x++) {
00117             v = bitmap[y * w + x];
00118             putc((v >> 16) & 0xff, f);
00119             putc((v >> 8) & 0xff, f);
00120             putc((v >> 0) & 0xff, f);
00121         }
00122     }
00123     fclose(f);
00124 
00125 
00126     snprintf(fname2, sizeof(fname2), "%s-a.pgm", filename);
00127 
00128     f = fopen(fname2, "w");
00129     if (!f) {
00130         perror(fname2);
00131         return;
00132     }
00133     fprintf(f, "P5\n"
00134             "%d %d\n"
00135             "%d\n",
00136             w, h, 255);
00137     for(y = 0; y < h; y++) {
00138         for(x = 0; x < w; x++) {
00139             v = bitmap[y * w + x];
00140             putc((v >> 24) & 0xff, f);
00141         }
00142     }
00143     fclose(f);
00144 
00145     snprintf(command, sizeof(command), "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
00146     system(command);
00147 
00148     snprintf(command, sizeof(command), "rm %s %s", fname, fname2);
00149     system(command);
00150 }
00151 #endif
00152 
00153 #define RGBA(r,g,b,a) (((a) << 24) | ((r) << 16) | ((g) << 8) | (b))
00154 
00155 typedef struct DVBSubCLUT {
00156     int id;
00157 
00158     uint32_t clut4[4];
00159     uint32_t clut16[16];
00160     uint32_t clut256[256];
00161 
00162     struct DVBSubCLUT *next;
00163 } DVBSubCLUT;
00164 
00165 static DVBSubCLUT default_clut;
00166 
00167 typedef struct DVBSubObjectDisplay {
00168     int object_id;
00169     int region_id;
00170 
00171     int x_pos;
00172     int y_pos;
00173 
00174     int fgcolor;
00175     int bgcolor;
00176 
00177     struct DVBSubObjectDisplay *region_list_next;
00178     struct DVBSubObjectDisplay *object_list_next;
00179 } DVBSubObjectDisplay;
00180 
00181 typedef struct DVBSubObject {
00182     int id;
00183 
00184     int type;
00185 
00186     DVBSubObjectDisplay *display_list;
00187 
00188     struct DVBSubObject *next;
00189 } DVBSubObject;
00190 
00191 typedef struct DVBSubRegionDisplay {
00192     int region_id;
00193 
00194     int x_pos;
00195     int y_pos;
00196 
00197     struct DVBSubRegionDisplay *next;
00198 } DVBSubRegionDisplay;
00199 
00200 typedef struct DVBSubRegion {
00201     int id;
00202 
00203     int width;
00204     int height;
00205     int depth;
00206 
00207     int clut;
00208     int bgcolor;
00209 
00210     uint8_t *pbuf;
00211     int buf_size;
00212 
00213     DVBSubObjectDisplay *display_list;
00214 
00215     struct DVBSubRegion *next;
00216 } DVBSubRegion;
00217 
00218 typedef struct DVBSubDisplayDefinition {
00219     int version;
00220 
00221     int x;
00222     int y;
00223     int width;
00224     int height;
00225 } DVBSubDisplayDefinition;
00226 
00227 typedef struct DVBSubContext {
00228     int composition_id;
00229     int ancillary_id;
00230 
00231     int time_out;
00232     DVBSubRegion *region_list;
00233     DVBSubCLUT   *clut_list;
00234     DVBSubObject *object_list;
00235 
00236     int display_list_size;
00237     DVBSubRegionDisplay *display_list;
00238     DVBSubDisplayDefinition *display_definition;
00239 } DVBSubContext;
00240 
00241 
00242 static DVBSubObject* get_object(DVBSubContext *ctx, int object_id)
00243 {
00244     DVBSubObject *ptr = ctx->object_list;
00245 
00246     while (ptr && ptr->id != object_id) {
00247         ptr = ptr->next;
00248     }
00249 
00250     return ptr;
00251 }
00252 
00253 static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id)
00254 {
00255     DVBSubCLUT *ptr = ctx->clut_list;
00256 
00257     while (ptr && ptr->id != clut_id) {
00258         ptr = ptr->next;
00259     }
00260 
00261     return ptr;
00262 }
00263 
00264 static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)
00265 {
00266     DVBSubRegion *ptr = ctx->region_list;
00267 
00268     while (ptr && ptr->id != region_id) {
00269         ptr = ptr->next;
00270     }
00271 
00272     return ptr;
00273 }
00274 
00275 static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)
00276 {
00277     DVBSubObject *object, *obj2, **obj2_ptr;
00278     DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr;
00279 
00280     while (region->display_list) {
00281         display = region->display_list;
00282 
00283         object = get_object(ctx, display->object_id);
00284 
00285         if (object) {
00286             obj_disp_ptr = &object->display_list;
00287             obj_disp = *obj_disp_ptr;
00288 
00289             while (obj_disp && obj_disp != display) {
00290                 obj_disp_ptr = &obj_disp->object_list_next;
00291                 obj_disp = *obj_disp_ptr;
00292             }
00293 
00294             if (obj_disp) {
00295                 *obj_disp_ptr = obj_disp->object_list_next;
00296 
00297                 if (!object->display_list) {
00298                     obj2_ptr = &ctx->object_list;
00299                     obj2 = *obj2_ptr;
00300 
00301                     while (obj2 != object) {
00302                         assert(obj2);
00303                         obj2_ptr = &obj2->next;
00304                         obj2 = *obj2_ptr;
00305                     }
00306 
00307                     *obj2_ptr = obj2->next;
00308 
00309                     av_free(obj2);
00310                 }
00311             }
00312         }
00313 
00314         region->display_list = display->region_list_next;
00315 
00316         av_free(display);
00317     }
00318 
00319 }
00320 
00321 static void delete_state(DVBSubContext *ctx)
00322 {
00323     DVBSubRegion *region;
00324     DVBSubCLUT *clut;
00325 
00326     while (ctx->region_list) {
00327         region = ctx->region_list;
00328 
00329         ctx->region_list = region->next;
00330 
00331         delete_region_display_list(ctx, region);
00332         av_free(region->pbuf);
00333         av_free(region);
00334     }
00335 
00336     while (ctx->clut_list) {
00337         clut = ctx->clut_list;
00338 
00339         ctx->clut_list = clut->next;
00340 
00341         av_free(clut);
00342     }
00343 
00344     av_freep(&ctx->display_definition);
00345 
00346     /* Should already be null */
00347     if (ctx->object_list)
00348         av_log(0, AV_LOG_ERROR, "Memory deallocation error!\n");
00349 }
00350 
00351 static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)
00352 {
00353     int i, r, g, b, a = 0;
00354     DVBSubContext *ctx = avctx->priv_data;
00355 
00356     if (!avctx->extradata || avctx->extradata_size != 4) {
00357         av_log(avctx, AV_LOG_WARNING, "Invalid extradata, subtitle streams may be combined!\n");
00358         ctx->composition_id = -1;
00359         ctx->ancillary_id   = -1;
00360     } else {
00361         ctx->composition_id = AV_RB16(avctx->extradata);
00362         ctx->ancillary_id   = AV_RB16(avctx->extradata + 2);
00363     }
00364 
00365     default_clut.id = -1;
00366     default_clut.next = NULL;
00367 
00368     default_clut.clut4[0] = RGBA(  0,   0,   0,   0);
00369     default_clut.clut4[1] = RGBA(255, 255, 255, 255);
00370     default_clut.clut4[2] = RGBA(  0,   0,   0, 255);
00371     default_clut.clut4[3] = RGBA(127, 127, 127, 255);
00372 
00373     default_clut.clut16[0] = RGBA(  0,   0,   0,   0);
00374     for (i = 1; i < 16; i++) {
00375         if (i < 8) {
00376             r = (i & 1) ? 255 : 0;
00377             g = (i & 2) ? 255 : 0;
00378             b = (i & 4) ? 255 : 0;
00379         } else {
00380             r = (i & 1) ? 127 : 0;
00381             g = (i & 2) ? 127 : 0;
00382             b = (i & 4) ? 127 : 0;
00383         }
00384         default_clut.clut16[i] = RGBA(r, g, b, 255);
00385     }
00386 
00387     default_clut.clut256[0] = RGBA(  0,   0,   0,   0);
00388     for (i = 1; i < 256; i++) {
00389         if (i < 8) {
00390             r = (i & 1) ? 255 : 0;
00391             g = (i & 2) ? 255 : 0;
00392             b = (i & 4) ? 255 : 0;
00393             a = 63;
00394         } else {
00395             switch (i & 0x88) {
00396             case 0x00:
00397                 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
00398                 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
00399                 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
00400                 a = 255;
00401                 break;
00402             case 0x08:
00403                 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
00404                 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
00405                 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
00406                 a = 127;
00407                 break;
00408             case 0x80:
00409                 r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
00410                 g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
00411                 b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
00412                 a = 255;
00413                 break;
00414             case 0x88:
00415                 r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
00416                 g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
00417                 b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
00418                 a = 255;
00419                 break;
00420             }
00421         }
00422         default_clut.clut256[i] = RGBA(r, g, b, a);
00423     }
00424 
00425     return 0;
00426 }
00427 
00428 static av_cold int dvbsub_close_decoder(AVCodecContext *avctx)
00429 {
00430     DVBSubContext *ctx = avctx->priv_data;
00431     DVBSubRegionDisplay *display;
00432 
00433     delete_state(ctx);
00434 
00435     while (ctx->display_list) {
00436         display = ctx->display_list;
00437         ctx->display_list = display->next;
00438 
00439         av_free(display);
00440     }
00441 
00442     return 0;
00443 }
00444 
00445 static int dvbsub_read_2bit_string(uint8_t *destbuf, int dbuf_len,
00446                                    const uint8_t **srcbuf, int buf_size,
00447                                    int non_mod, uint8_t *map_table)
00448 {
00449     GetBitContext gb;
00450 
00451     int bits;
00452     int run_length;
00453     int pixels_read = 0;
00454 
00455     init_get_bits(&gb, *srcbuf, buf_size << 3);
00456 
00457     while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
00458         bits = get_bits(&gb, 2);
00459 
00460         if (bits) {
00461             if (non_mod != 1 || bits != 1) {
00462                 if (map_table)
00463                     *destbuf++ = map_table[bits];
00464                 else
00465                     *destbuf++ = bits;
00466             }
00467             pixels_read++;
00468         } else {
00469             bits = get_bits1(&gb);
00470             if (bits == 1) {
00471                 run_length = get_bits(&gb, 3) + 3;
00472                 bits = get_bits(&gb, 2);
00473 
00474                 if (non_mod == 1 && bits == 1)
00475                     pixels_read += run_length;
00476                 else {
00477                     if (map_table)
00478                         bits = map_table[bits];
00479                     while (run_length-- > 0 && pixels_read < dbuf_len) {
00480                         *destbuf++ = bits;
00481                         pixels_read++;
00482                     }
00483                 }
00484             } else {
00485                 bits = get_bits1(&gb);
00486                 if (bits == 0) {
00487                     bits = get_bits(&gb, 2);
00488                     if (bits == 2) {
00489                         run_length = get_bits(&gb, 4) + 12;
00490                         bits = get_bits(&gb, 2);
00491 
00492                         if (non_mod == 1 && bits == 1)
00493                             pixels_read += run_length;
00494                         else {
00495                             if (map_table)
00496                                 bits = map_table[bits];
00497                             while (run_length-- > 0 && pixels_read < dbuf_len) {
00498                                 *destbuf++ = bits;
00499                                 pixels_read++;
00500                             }
00501                         }
00502                     } else if (bits == 3) {
00503                         run_length = get_bits(&gb, 8) + 29;
00504                         bits = get_bits(&gb, 2);
00505 
00506                         if (non_mod == 1 && bits == 1)
00507                             pixels_read += run_length;
00508                         else {
00509                             if (map_table)
00510                                 bits = map_table[bits];
00511                             while (run_length-- > 0 && pixels_read < dbuf_len) {
00512                                 *destbuf++ = bits;
00513                                 pixels_read++;
00514                             }
00515                         }
00516                     } else if (bits == 1) {
00517                         pixels_read += 2;
00518                         if (map_table)
00519                             bits = map_table[0];
00520                         else
00521                             bits = 0;
00522                         if (pixels_read <= dbuf_len) {
00523                             *destbuf++ = bits;
00524                             *destbuf++ = bits;
00525                         }
00526                     } else {
00527                         (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
00528                         return pixels_read;
00529                     }
00530                 } else {
00531                     if (map_table)
00532                         bits = map_table[0];
00533                     else
00534                         bits = 0;
00535                     *destbuf++ = bits;
00536                     pixels_read++;
00537                 }
00538             }
00539         }
00540     }
00541 
00542     if (get_bits(&gb, 6))
00543         av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
00544 
00545     (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
00546 
00547     return pixels_read;
00548 }
00549 
00550 static int dvbsub_read_4bit_string(uint8_t *destbuf, int dbuf_len,
00551                                    const uint8_t **srcbuf, int buf_size,
00552                                    int non_mod, uint8_t *map_table)
00553 {
00554     GetBitContext gb;
00555 
00556     int bits;
00557     int run_length;
00558     int pixels_read = 0;
00559 
00560     init_get_bits(&gb, *srcbuf, buf_size << 3);
00561 
00562     while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
00563         bits = get_bits(&gb, 4);
00564 
00565         if (bits) {
00566             if (non_mod != 1 || bits != 1) {
00567                 if (map_table)
00568                     *destbuf++ = map_table[bits];
00569                 else
00570                     *destbuf++ = bits;
00571             }
00572             pixels_read++;
00573         } else {
00574             bits = get_bits1(&gb);
00575             if (bits == 0) {
00576                 run_length = get_bits(&gb, 3);
00577 
00578                 if (run_length == 0) {
00579                     (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
00580                     return pixels_read;
00581                 }
00582 
00583                 run_length += 2;
00584 
00585                 if (map_table)
00586                     bits = map_table[0];
00587                 else
00588                     bits = 0;
00589 
00590                 while (run_length-- > 0 && pixels_read < dbuf_len) {
00591                     *destbuf++ = bits;
00592                     pixels_read++;
00593                 }
00594             } else {
00595                 bits = get_bits1(&gb);
00596                 if (bits == 0) {
00597                     run_length = get_bits(&gb, 2) + 4;
00598                     bits = get_bits(&gb, 4);
00599 
00600                     if (non_mod == 1 && bits == 1)
00601                         pixels_read += run_length;
00602                     else {
00603                         if (map_table)
00604                             bits = map_table[bits];
00605                         while (run_length-- > 0 && pixels_read < dbuf_len) {
00606                             *destbuf++ = bits;
00607                             pixels_read++;
00608                         }
00609                     }
00610                 } else {
00611                     bits = get_bits(&gb, 2);
00612                     if (bits == 2) {
00613                         run_length = get_bits(&gb, 4) + 9;
00614                         bits = get_bits(&gb, 4);
00615 
00616                         if (non_mod == 1 && bits == 1)
00617                             pixels_read += run_length;
00618                         else {
00619                             if (map_table)
00620                                 bits = map_table[bits];
00621                             while (run_length-- > 0 && pixels_read < dbuf_len) {
00622                                 *destbuf++ = bits;
00623                                 pixels_read++;
00624                             }
00625                         }
00626                     } else if (bits == 3) {
00627                         run_length = get_bits(&gb, 8) + 25;
00628                         bits = get_bits(&gb, 4);
00629 
00630                         if (non_mod == 1 && bits == 1)
00631                             pixels_read += run_length;
00632                         else {
00633                             if (map_table)
00634                                 bits = map_table[bits];
00635                             while (run_length-- > 0 && pixels_read < dbuf_len) {
00636                                 *destbuf++ = bits;
00637                                 pixels_read++;
00638                             }
00639                         }
00640                     } else if (bits == 1) {
00641                         pixels_read += 2;
00642                         if (map_table)
00643                             bits = map_table[0];
00644                         else
00645                             bits = 0;
00646                         if (pixels_read <= dbuf_len) {
00647                             *destbuf++ = bits;
00648                             *destbuf++ = bits;
00649                         }
00650                     } else {
00651                         if (map_table)
00652                             bits = map_table[0];
00653                         else
00654                             bits = 0;
00655                         *destbuf++ = bits;
00656                         pixels_read ++;
00657                     }
00658                 }
00659             }
00660         }
00661     }
00662 
00663     if (get_bits(&gb, 8))
00664         av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
00665 
00666     (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
00667 
00668     return pixels_read;
00669 }
00670 
00671 static int dvbsub_read_8bit_string(uint8_t *destbuf, int dbuf_len,
00672                                     const uint8_t **srcbuf, int buf_size,
00673                                     int non_mod, uint8_t *map_table)
00674 {
00675     const uint8_t *sbuf_end = (*srcbuf) + buf_size;
00676     int bits;
00677     int run_length;
00678     int pixels_read = 0;
00679 
00680     while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
00681         bits = *(*srcbuf)++;
00682 
00683         if (bits) {
00684             if (non_mod != 1 || bits != 1) {
00685                 if (map_table)
00686                     *destbuf++ = map_table[bits];
00687                 else
00688                     *destbuf++ = bits;
00689             }
00690             pixels_read++;
00691         } else {
00692             bits = *(*srcbuf)++;
00693             run_length = bits & 0x7f;
00694             if ((bits & 0x80) == 0) {
00695                 if (run_length == 0) {
00696                     return pixels_read;
00697                 }
00698 
00699                 if (map_table)
00700                     bits = map_table[0];
00701                 else
00702                     bits = 0;
00703                 while (run_length-- > 0 && pixels_read < dbuf_len) {
00704                     *destbuf++ = bits;
00705                     pixels_read++;
00706                 }
00707             } else {
00708                 bits = *(*srcbuf)++;
00709 
00710                 if (non_mod == 1 && bits == 1)
00711                     pixels_read += run_length;
00712                 if (map_table)
00713                     bits = map_table[bits];
00714                 else while (run_length-- > 0 && pixels_read < dbuf_len) {
00715                     *destbuf++ = bits;
00716                     pixels_read++;
00717                 }
00718             }
00719         }
00720     }
00721 
00722     if (*(*srcbuf)++)
00723         av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
00724 
00725     return pixels_read;
00726 }
00727 
00728 
00729 
00730 static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,
00731                                           const uint8_t *buf, int buf_size, int top_bottom, int non_mod)
00732 {
00733     DVBSubContext *ctx = avctx->priv_data;
00734 
00735     DVBSubRegion *region = get_region(ctx, display->region_id);
00736     const uint8_t *buf_end = buf + buf_size;
00737     uint8_t *pbuf;
00738     int x_pos, y_pos;
00739     int i;
00740 
00741     uint8_t map2to4[] = { 0x0,  0x7,  0x8,  0xf};
00742     uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
00743     uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
00744                          0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
00745     uint8_t *map_table;
00746 
00747     av_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size,
00748             top_bottom ? "bottom" : "top");
00749 
00750     for (i = 0; i < buf_size; i++) {
00751         if (i % 16 == 0)
00752             av_dlog(avctx, "0x%8p: ", buf+i);
00753 
00754         av_dlog(avctx, "%02x ", buf[i]);
00755         if (i % 16 == 15)
00756             av_dlog(avctx, "\n");
00757     }
00758 
00759     if (i % 16)
00760         av_dlog(avctx, "\n");
00761 
00762     if (region == 0)
00763         return;
00764 
00765     pbuf = region->pbuf;
00766 
00767     x_pos = display->x_pos;
00768     y_pos = display->y_pos;
00769 
00770     if ((y_pos & 1) != top_bottom)
00771         y_pos++;
00772 
00773     while (buf < buf_end) {
00774         if (x_pos > region->width || y_pos > region->height) {
00775             av_log(avctx, AV_LOG_ERROR, "Invalid object location!\n");
00776             return;
00777         }
00778 
00779         switch (*buf++) {
00780         case 0x10:
00781             if (region->depth == 8)
00782                 map_table = map2to8;
00783             else if (region->depth == 4)
00784                 map_table = map2to4;
00785             else
00786                 map_table = NULL;
00787 
00788             x_pos += dvbsub_read_2bit_string(pbuf + (y_pos * region->width) + x_pos,
00789                                                 region->width - x_pos, &buf, buf_end - buf,
00790                                                 non_mod, map_table);
00791             break;
00792         case 0x11:
00793             if (region->depth < 4) {
00794                 av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
00795                 return;
00796             }
00797 
00798             if (region->depth == 8)
00799                 map_table = map4to8;
00800             else
00801                 map_table = NULL;
00802 
00803             x_pos += dvbsub_read_4bit_string(pbuf + (y_pos * region->width) + x_pos,
00804                                                 region->width - x_pos, &buf, buf_end - buf,
00805                                                 non_mod, map_table);
00806             break;
00807         case 0x12:
00808             if (region->depth < 8) {
00809                 av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
00810                 return;
00811             }
00812 
00813             x_pos += dvbsub_read_8bit_string(pbuf + (y_pos * region->width) + x_pos,
00814                                                 region->width - x_pos, &buf, buf_end - buf,
00815                                                 non_mod, NULL);
00816             break;
00817 
00818         case 0x20:
00819             map2to4[0] = (*buf) >> 4;
00820             map2to4[1] = (*buf++) & 0xf;
00821             map2to4[2] = (*buf) >> 4;
00822             map2to4[3] = (*buf++) & 0xf;
00823             break;
00824         case 0x21:
00825             for (i = 0; i < 4; i++)
00826                 map2to8[i] = *buf++;
00827             break;
00828         case 0x22:
00829             for (i = 0; i < 16; i++)
00830                 map4to8[i] = *buf++;
00831             break;
00832 
00833         case 0xf0:
00834             x_pos = display->x_pos;
00835             y_pos += 2;
00836             break;
00837         default:
00838             av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
00839         }
00840     }
00841 
00842 }
00843 
00844 static void dvbsub_parse_object_segment(AVCodecContext *avctx,
00845                                         const uint8_t *buf, int buf_size)
00846 {
00847     DVBSubContext *ctx = avctx->priv_data;
00848 
00849     const uint8_t *buf_end = buf + buf_size;
00850     const uint8_t *block;
00851     int object_id;
00852     DVBSubObject *object;
00853     DVBSubObjectDisplay *display;
00854     int top_field_len, bottom_field_len;
00855 
00856     int coding_method, non_modifying_color;
00857 
00858     object_id = AV_RB16(buf);
00859     buf += 2;
00860 
00861     object = get_object(ctx, object_id);
00862 
00863     if (!object)
00864         return;
00865 
00866     coding_method = ((*buf) >> 2) & 3;
00867     non_modifying_color = ((*buf++) >> 1) & 1;
00868 
00869     if (coding_method == 0) {
00870         top_field_len = AV_RB16(buf);
00871         buf += 2;
00872         bottom_field_len = AV_RB16(buf);
00873         buf += 2;
00874 
00875         if (buf + top_field_len + bottom_field_len > buf_end) {
00876             av_log(avctx, AV_LOG_ERROR, "Field data size too large\n");
00877             return;
00878         }
00879 
00880         for (display = object->display_list; display; display = display->object_list_next) {
00881             block = buf;
00882 
00883             dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
00884                                             non_modifying_color);
00885 
00886             if (bottom_field_len > 0)
00887                 block = buf + top_field_len;
00888             else
00889                 bottom_field_len = top_field_len;
00890 
00891             dvbsub_parse_pixel_data_block(avctx, display, block, bottom_field_len, 1,
00892                                             non_modifying_color);
00893         }
00894 
00895 /*  } else if (coding_method == 1) {*/
00896 
00897     } else {
00898         av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
00899     }
00900 
00901 }
00902 
00903 static void dvbsub_parse_clut_segment(AVCodecContext *avctx,
00904                                         const uint8_t *buf, int buf_size)
00905 {
00906     DVBSubContext *ctx = avctx->priv_data;
00907 
00908     const uint8_t *buf_end = buf + buf_size;
00909     int i, clut_id;
00910     DVBSubCLUT *clut;
00911     int entry_id, depth , full_range;
00912     int y, cr, cb, alpha;
00913     int r, g, b, r_add, g_add, b_add;
00914 
00915     av_dlog(avctx, "DVB clut packet:\n");
00916 
00917     for (i=0; i < buf_size; i++) {
00918         av_dlog(avctx, "%02x ", buf[i]);
00919         if (i % 16 == 15)
00920             av_dlog(avctx, "\n");
00921     }
00922 
00923     if (i % 16)
00924         av_dlog(avctx, "\n");
00925 
00926     clut_id = *buf++;
00927     buf += 1;
00928 
00929     clut = get_clut(ctx, clut_id);
00930 
00931     if (!clut) {
00932         clut = av_malloc(sizeof(DVBSubCLUT));
00933 
00934         memcpy(clut, &default_clut, sizeof(DVBSubCLUT));
00935 
00936         clut->id = clut_id;
00937 
00938         clut->next = ctx->clut_list;
00939         ctx->clut_list = clut;
00940     }
00941 
00942     while (buf + 4 < buf_end) {
00943         entry_id = *buf++;
00944 
00945         depth = (*buf) & 0xe0;
00946 
00947         if (depth == 0) {
00948             av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
00949             return;
00950         }
00951 
00952         full_range = (*buf++) & 1;
00953 
00954         if (full_range) {
00955             y = *buf++;
00956             cr = *buf++;
00957             cb = *buf++;
00958             alpha = *buf++;
00959         } else {
00960             y = buf[0] & 0xfc;
00961             cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
00962             cb = (buf[1] << 2) & 0xf0;
00963             alpha = (buf[1] << 6) & 0xc0;
00964 
00965             buf += 2;
00966         }
00967 
00968         if (y == 0)
00969             alpha = 0xff;
00970 
00971         YUV_TO_RGB1_CCIR(cb, cr);
00972         YUV_TO_RGB2_CCIR(r, g, b, y);
00973 
00974         av_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
00975 
00976         if (depth & 0x80)
00977             clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
00978         if (depth & 0x40)
00979             clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
00980         if (depth & 0x20)
00981             clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
00982     }
00983 }
00984 
00985 
00986 static void dvbsub_parse_region_segment(AVCodecContext *avctx,
00987                                         const uint8_t *buf, int buf_size)
00988 {
00989     DVBSubContext *ctx = avctx->priv_data;
00990 
00991     const uint8_t *buf_end = buf + buf_size;
00992     int region_id, object_id;
00993     DVBSubRegion *region;
00994     DVBSubObject *object;
00995     DVBSubObjectDisplay *display;
00996     int fill;
00997 
00998     if (buf_size < 10)
00999         return;
01000 
01001     region_id = *buf++;
01002 
01003     region = get_region(ctx, region_id);
01004 
01005     if (!region) {
01006         region = av_mallocz(sizeof(DVBSubRegion));
01007 
01008         region->id = region_id;
01009 
01010         region->next = ctx->region_list;
01011         ctx->region_list = region;
01012     }
01013 
01014     fill = ((*buf++) >> 3) & 1;
01015 
01016     region->width = AV_RB16(buf);
01017     buf += 2;
01018     region->height = AV_RB16(buf);
01019     buf += 2;
01020 
01021     if (region->width * region->height != region->buf_size) {
01022         av_free(region->pbuf);
01023 
01024         region->buf_size = region->width * region->height;
01025 
01026         region->pbuf = av_malloc(region->buf_size);
01027 
01028         fill = 1;
01029     }
01030 
01031     region->depth = 1 << (((*buf++) >> 2) & 7);
01032     if(region->depth<2 || region->depth>8){
01033         av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth);
01034         region->depth= 4;
01035     }
01036     region->clut = *buf++;
01037 
01038     if (region->depth == 8)
01039         region->bgcolor = *buf++;
01040     else {
01041         buf += 1;
01042 
01043         if (region->depth == 4)
01044             region->bgcolor = (((*buf++) >> 4) & 15);
01045         else
01046             region->bgcolor = (((*buf++) >> 2) & 3);
01047     }
01048 
01049     av_dlog(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
01050 
01051     if (fill) {
01052         memset(region->pbuf, region->bgcolor, region->buf_size);
01053         av_dlog(avctx, "Fill region (%d)\n", region->bgcolor);
01054     }
01055 
01056     delete_region_display_list(ctx, region);
01057 
01058     while (buf + 5 < buf_end) {
01059         object_id = AV_RB16(buf);
01060         buf += 2;
01061 
01062         object = get_object(ctx, object_id);
01063 
01064         if (!object) {
01065             object = av_mallocz(sizeof(DVBSubObject));
01066 
01067             object->id = object_id;
01068             object->next = ctx->object_list;
01069             ctx->object_list = object;
01070         }
01071 
01072         object->type = (*buf) >> 6;
01073 
01074         display = av_mallocz(sizeof(DVBSubObjectDisplay));
01075 
01076         display->object_id = object_id;
01077         display->region_id = region_id;
01078 
01079         display->x_pos = AV_RB16(buf) & 0xfff;
01080         buf += 2;
01081         display->y_pos = AV_RB16(buf) & 0xfff;
01082         buf += 2;
01083 
01084         if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
01085             display->fgcolor = *buf++;
01086             display->bgcolor = *buf++;
01087         }
01088 
01089         display->region_list_next = region->display_list;
01090         region->display_list = display;
01091 
01092         display->object_list_next = object->display_list;
01093         object->display_list = display;
01094     }
01095 }
01096 
01097 static void dvbsub_parse_page_segment(AVCodecContext *avctx,
01098                                         const uint8_t *buf, int buf_size)
01099 {
01100     DVBSubContext *ctx = avctx->priv_data;
01101     DVBSubRegionDisplay *display;
01102     DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
01103 
01104     const uint8_t *buf_end = buf + buf_size;
01105     int region_id;
01106     int page_state;
01107 
01108     if (buf_size < 1)
01109         return;
01110 
01111     ctx->time_out = *buf++;
01112     page_state = ((*buf++) >> 2) & 3;
01113 
01114     av_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
01115 
01116     if (page_state == 2) {
01117         delete_state(ctx);
01118     }
01119 
01120     tmp_display_list = ctx->display_list;
01121     ctx->display_list = NULL;
01122     ctx->display_list_size = 0;
01123 
01124     while (buf + 5 < buf_end) {
01125         region_id = *buf++;
01126         buf += 1;
01127 
01128         display = tmp_display_list;
01129         tmp_ptr = &tmp_display_list;
01130 
01131         while (display && display->region_id != region_id) {
01132             tmp_ptr = &display->next;
01133             display = display->next;
01134         }
01135 
01136         if (!display)
01137             display = av_mallocz(sizeof(DVBSubRegionDisplay));
01138 
01139         display->region_id = region_id;
01140 
01141         display->x_pos = AV_RB16(buf);
01142         buf += 2;
01143         display->y_pos = AV_RB16(buf);
01144         buf += 2;
01145 
01146         *tmp_ptr = display->next;
01147 
01148         display->next = ctx->display_list;
01149         ctx->display_list = display;
01150         ctx->display_list_size++;
01151 
01152         av_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
01153     }
01154 
01155     while (tmp_display_list) {
01156         display = tmp_display_list;
01157 
01158         tmp_display_list = display->next;
01159 
01160         av_free(display);
01161     }
01162 
01163 }
01164 
01165 
01166 #ifdef DEBUG
01167 static void save_display_set(DVBSubContext *ctx)
01168 {
01169     DVBSubRegion *region;
01170     DVBSubRegionDisplay *display;
01171     DVBSubCLUT *clut;
01172     uint32_t *clut_table;
01173     int x_pos, y_pos, width, height;
01174     int x, y, y_off, x_off;
01175     uint32_t *pbuf;
01176     char filename[32];
01177     static int fileno_index = 0;
01178 
01179     x_pos = -1;
01180     y_pos = -1;
01181     width = 0;
01182     height = 0;
01183 
01184     for (display = ctx->display_list; display; display = display->next) {
01185         region = get_region(ctx, display->region_id);
01186 
01187         if (x_pos == -1) {
01188             x_pos = display->x_pos;
01189             y_pos = display->y_pos;
01190             width = region->width;
01191             height = region->height;
01192         } else {
01193             if (display->x_pos < x_pos) {
01194                 width += (x_pos - display->x_pos);
01195                 x_pos = display->x_pos;
01196             }
01197 
01198             if (display->y_pos < y_pos) {
01199                 height += (y_pos - display->y_pos);
01200                 y_pos = display->y_pos;
01201             }
01202 
01203             if (display->x_pos + region->width > x_pos + width) {
01204                 width = display->x_pos + region->width - x_pos;
01205             }
01206 
01207             if (display->y_pos + region->height > y_pos + height) {
01208                 height = display->y_pos + region->height - y_pos;
01209             }
01210         }
01211     }
01212 
01213     if (x_pos >= 0) {
01214 
01215         pbuf = av_malloc(width * height * 4);
01216 
01217         for (display = ctx->display_list; display; display = display->next) {
01218             region = get_region(ctx, display->region_id);
01219 
01220             x_off = display->x_pos - x_pos;
01221             y_off = display->y_pos - y_pos;
01222 
01223             clut = get_clut(ctx, region->clut);
01224 
01225             if (clut == 0)
01226                 clut = &default_clut;
01227 
01228             switch (region->depth) {
01229             case 2:
01230                 clut_table = clut->clut4;
01231                 break;
01232             case 8:
01233                 clut_table = clut->clut256;
01234                 break;
01235             case 4:
01236             default:
01237                 clut_table = clut->clut16;
01238                 break;
01239             }
01240 
01241             for (y = 0; y < region->height; y++) {
01242                 for (x = 0; x < region->width; x++) {
01243                     pbuf[((y + y_off) * width) + x_off + x] =
01244                         clut_table[region->pbuf[y * region->width + x]];
01245                 }
01246             }
01247 
01248         }
01249 
01250         snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index);
01251 
01252         png_save2(filename, pbuf, width, height);
01253 
01254         av_free(pbuf);
01255     }
01256 
01257     fileno_index++;
01258 }
01259 #endif
01260 
01261 static void dvbsub_parse_display_definition_segment(AVCodecContext *avctx,
01262                                                     const uint8_t *buf,
01263                                                     int buf_size)
01264 {
01265     DVBSubContext *ctx = avctx->priv_data;
01266     DVBSubDisplayDefinition *display_def = ctx->display_definition;
01267     int dds_version, info_byte;
01268 
01269     if (buf_size < 5)
01270         return;
01271 
01272     info_byte   = bytestream_get_byte(&buf);
01273     dds_version = info_byte >> 4;
01274     if (display_def && display_def->version == dds_version)
01275         return; // already have this display definition version
01276 
01277     if (!display_def) {
01278         display_def             = av_mallocz(sizeof(*display_def));
01279         ctx->display_definition = display_def;
01280     }
01281     if (!display_def)
01282         return;
01283 
01284     display_def->version = dds_version;
01285     display_def->x       = 0;
01286     display_def->y       = 0;
01287     display_def->width   = bytestream_get_be16(&buf) + 1;
01288     display_def->height  = bytestream_get_be16(&buf) + 1;
01289 
01290     if (buf_size < 13)
01291         return;
01292 
01293     if (info_byte & 1<<3) { // display_window_flag
01294         display_def->x = bytestream_get_be16(&buf);
01295         display_def->y = bytestream_get_be16(&buf);
01296         display_def->width  = bytestream_get_be16(&buf) - display_def->x + 1;
01297         display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;
01298     }
01299 }
01300 
01301 static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,
01302                                         int buf_size, AVSubtitle *sub)
01303 {
01304     DVBSubContext *ctx = avctx->priv_data;
01305     DVBSubDisplayDefinition *display_def = ctx->display_definition;
01306 
01307     DVBSubRegion *region;
01308     DVBSubRegionDisplay *display;
01309     AVSubtitleRect *rect;
01310     DVBSubCLUT *clut;
01311     uint32_t *clut_table;
01312     int i;
01313     int offset_x=0, offset_y=0;
01314 
01315     sub->rects = NULL;
01316     sub->start_display_time = 0;
01317     sub->end_display_time = ctx->time_out * 1000;
01318     sub->format = 0;
01319 
01320     if (display_def) {
01321         offset_x = display_def->x;
01322         offset_y = display_def->y;
01323     }
01324 
01325     sub->num_rects = ctx->display_list_size;
01326 
01327     if (sub->num_rects > 0){
01328         sub->rects = av_mallocz(sizeof(*sub->rects) * sub->num_rects);
01329         for(i=0; i<sub->num_rects; i++)
01330             sub->rects[i] = av_mallocz(sizeof(*sub->rects[i]));
01331     }
01332 
01333     i = 0;
01334 
01335     for (display = ctx->display_list; display; display = display->next) {
01336         region = get_region(ctx, display->region_id);
01337         rect = sub->rects[i];
01338 
01339         if (!region)
01340             continue;
01341 
01342         rect->x = display->x_pos + offset_x;
01343         rect->y = display->y_pos + offset_y;
01344         rect->w = region->width;
01345         rect->h = region->height;
01346         rect->nb_colors = 16;
01347         rect->type      = SUBTITLE_BITMAP;
01348         rect->pict.linesize[0] = region->width;
01349 
01350         clut = get_clut(ctx, region->clut);
01351 
01352         if (!clut)
01353             clut = &default_clut;
01354 
01355         switch (region->depth) {
01356         case 2:
01357             clut_table = clut->clut4;
01358             break;
01359         case 8:
01360             clut_table = clut->clut256;
01361             break;
01362         case 4:
01363         default:
01364             clut_table = clut->clut16;
01365             break;
01366         }
01367 
01368         rect->pict.data[1] = av_mallocz(AVPALETTE_SIZE);
01369         memcpy(rect->pict.data[1], clut_table, (1 << region->depth) * sizeof(uint32_t));
01370 
01371         rect->pict.data[0] = av_malloc(region->buf_size);
01372         memcpy(rect->pict.data[0], region->pbuf, region->buf_size);
01373 
01374         i++;
01375     }
01376 
01377     sub->num_rects = i;
01378 
01379 #ifdef DEBUG
01380     save_display_set(ctx);
01381 #endif
01382 
01383     return 1;
01384 }
01385 
01386 static int dvbsub_decode(AVCodecContext *avctx,
01387                          void *data, int *data_size,
01388                          AVPacket *avpkt)
01389 {
01390     const uint8_t *buf = avpkt->data;
01391     int buf_size = avpkt->size;
01392     DVBSubContext *ctx = avctx->priv_data;
01393     AVSubtitle *sub = data;
01394     const uint8_t *p, *p_end;
01395     int segment_type;
01396     int page_id;
01397     int segment_length;
01398     int i;
01399 
01400     av_dlog(avctx, "DVB sub packet:\n");
01401 
01402     for (i=0; i < buf_size; i++) {
01403         av_dlog(avctx, "%02x ", buf[i]);
01404         if (i % 16 == 15)
01405             av_dlog(avctx, "\n");
01406     }
01407 
01408     if (i % 16)
01409         av_dlog(avctx, "\n");
01410 
01411     if (buf_size <= 6 || *buf != 0x0f) {
01412         av_dlog(avctx, "incomplete or broken packet");
01413         return -1;
01414     }
01415 
01416     p = buf;
01417     p_end = buf + buf_size;
01418 
01419     while (p_end - p >= 6 && *p == 0x0f) {
01420         p += 1;
01421         segment_type = *p++;
01422         page_id = AV_RB16(p);
01423         p += 2;
01424         segment_length = AV_RB16(p);
01425         p += 2;
01426 
01427         if (p_end - p < segment_length) {
01428             av_dlog(avctx, "incomplete or broken packet");
01429             return -1;
01430         }
01431 
01432         if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||
01433             ctx->composition_id == -1 || ctx->ancillary_id == -1) {
01434             switch (segment_type) {
01435             case DVBSUB_PAGE_SEGMENT:
01436                 dvbsub_parse_page_segment(avctx, p, segment_length);
01437                 break;
01438             case DVBSUB_REGION_SEGMENT:
01439                 dvbsub_parse_region_segment(avctx, p, segment_length);
01440                 break;
01441             case DVBSUB_CLUT_SEGMENT:
01442                 dvbsub_parse_clut_segment(avctx, p, segment_length);
01443                 break;
01444             case DVBSUB_OBJECT_SEGMENT:
01445                 dvbsub_parse_object_segment(avctx, p, segment_length);
01446                 break;
01447             case DVBSUB_DISPLAYDEFINITION_SEGMENT:
01448                 dvbsub_parse_display_definition_segment(avctx, p, segment_length);
01449             case DVBSUB_DISPLAY_SEGMENT:
01450                 *data_size = dvbsub_display_end_segment(avctx, p, segment_length, sub);
01451                 break;
01452             default:
01453                 av_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",
01454                         segment_type, page_id, segment_length);
01455                 break;
01456             }
01457         }
01458 
01459         p += segment_length;
01460     }
01461 
01462     return p - buf;
01463 }
01464 
01465 
01466 AVCodec ff_dvbsub_decoder = {
01467     .name           = "dvbsub",
01468     .type           = AVMEDIA_TYPE_SUBTITLE,
01469     .id             = CODEC_ID_DVB_SUBTITLE,
01470     .priv_data_size = sizeof(DVBSubContext),
01471     .init           = dvbsub_init_decoder,
01472     .close          = dvbsub_close_decoder,
01473     .decode         = dvbsub_decode,
01474     .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),
01475 };
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