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FFmpeg/libavcodec/dvbsubdec.c

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  1. /*

  2.  * DVB subtitle decoding for ffmpeg

  3.  * Copyright (c) 2005 Ian Caulfield

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with FFmpeg; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. #include "avcodec.h"

  22. #include "dsputil.h"

  23. #include "get_bits.h"

  24. #include "colorspace.h"

  25. 

  26. //#define DEBUG

  27. //#define DEBUG_PACKET_CONTENTS

  28. //#define DEBUG_SAVE_IMAGES

  29. 

  30. #define DVBSUB_PAGE_SEGMENT     0x10

  31. #define DVBSUB_REGION_SEGMENT   0x11

  32. #define DVBSUB_CLUT_SEGMENT     0x12

  33. #define DVBSUB_OBJECT_SEGMENT   0x13

  34. #define DVBSUB_DISPLAY_SEGMENT  0x80

  35. 

  36. #define cm (ff_cropTbl + MAX_NEG_CROP)

  37. 

  38. #ifdef DEBUG_SAVE_IMAGES

  39. #undef fprintf

  40. #if 0

  41. static void png_save(const char *filename, uint8_t *bitmap, int w, int h,

  42.                      uint32_t *rgba_palette)

  43. {

  44.     int x, y, v;

  45.     FILE *f;

  46.     char fname[40], fname2[40];

  47.     char command[1024];

  48. 

  49.     snprintf(fname, 40, "%s.ppm", filename);

  50. 

  51.     f = fopen(fname, "w");

  52.     if (!f) {

  53.         perror(fname);

  54.         exit(1);

  55.     }

  56.     fprintf(f, "P6\n"

  57.             "%d %d\n"

  58.             "%d\n",

  59.             w, h, 255);

  60.     for(y = 0; y < h; y++) {

  61.         for(x = 0; x < w; x++) {

  62.             v = rgba_palette[bitmap[y * w + x]];

  63.             putc((v >> 16) & 0xff, f);

  64.             putc((v >> 8) & 0xff, f);

  65.             putc((v >> 0) & 0xff, f);

  66.         }

  67.     }

  68.     fclose(f);

  69. 

  70. 

  71.     snprintf(fname2, 40, "%s-a.pgm", filename);

  72. 

  73.     f = fopen(fname2, "w");

  74.     if (!f) {

  75.         perror(fname2);

  76.         exit(1);

  77.     }

  78.     fprintf(f, "P5\n"

  79.             "%d %d\n"

  80.             "%d\n",

  81.             w, h, 255);

  82.     for(y = 0; y < h; y++) {

  83.         for(x = 0; x < w; x++) {

  84.             v = rgba_palette[bitmap[y * w + x]];

  85.             putc((v >> 24) & 0xff, f);

  86.         }

  87.     }

  88.     fclose(f);

  89. 

  90.     snprintf(command, 1024, "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);

  91.     system(command);

  92. 

  93.     snprintf(command, 1024, "rm %s %s", fname, fname2);

  94.     system(command);

  95. }

  96. #endif

  97. 

  98. static void png_save2(const char *filename, uint32_t *bitmap, int w, int h)

  99. {

  100.     int x, y, v;

  101.     FILE *f;

  102.     char fname[40], fname2[40];

  103.     char command[1024];

  104. 

  105.     snprintf(fname, sizeof(fname), "%s.ppm", filename);

  106. 

  107.     f = fopen(fname, "w");

  108.     if (!f) {

  109.         perror(fname);

  110.         exit(1);

  111.     }

  112.     fprintf(f, "P6\n"

  113.             "%d %d\n"

  114.             "%d\n",

  115.             w, h, 255);

  116.     for(y = 0; y < h; y++) {

  117.         for(x = 0; x < w; x++) {

  118.             v = bitmap[y * w + x];

  119.             putc((v >> 16) & 0xff, f);

  120.             putc((v >> 8) & 0xff, f);

  121.             putc((v >> 0) & 0xff, f);

  122.         }

  123.     }

  124.     fclose(f);

  125. 

  126. 

  127.     snprintf(fname2, sizeof(fname2), "%s-a.pgm", filename);

  128. 

  129.     f = fopen(fname2, "w");

  130.     if (!f) {

  131.         perror(fname2);

  132.         exit(1);

  133.     }

  134.     fprintf(f, "P5\n"

  135.             "%d %d\n"

  136.             "%d\n",

  137.             w, h, 255);

  138.     for(y = 0; y < h; y++) {

  139.         for(x = 0; x < w; x++) {

  140.             v = bitmap[y * w + x];

  141.             putc((v >> 24) & 0xff, f);

  142.         }

  143.     }

  144.     fclose(f);

  145. 

  146.     snprintf(command, sizeof(command), "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);

  147.     system(command);

  148. 

  149.     snprintf(command, sizeof(command), "rm %s %s", fname, fname2);

  150.     system(command);

  151. }

  152. #endif

  153. 

  154. #define RGBA(r,g,b,a) (((a) << 24) | ((r) << 16) | ((g) << 8) | (b))

  155. 

  156. typedef struct DVBSubCLUT {

  157.     int id;

  158. 

  159.     uint32_t clut4[4];

  160.     uint32_t clut16[16];

  161.     uint32_t clut256[256];

  162. 

  163.     struct DVBSubCLUT *next;

  164. } DVBSubCLUT;

  165. 

  166. static DVBSubCLUT default_clut;

  167. 

  168. typedef struct DVBSubObjectDisplay {

  169.     int object_id;

  170.     int region_id;

  171. 

  172.     int x_pos;

  173.     int y_pos;

  174. 

  175.     int fgcolor;

  176.     int bgcolor;

  177. 

  178.     struct DVBSubObjectDisplay *region_list_next;

  179.     struct DVBSubObjectDisplay *object_list_next;

  180. } DVBSubObjectDisplay;

  181. 

  182. typedef struct DVBSubObject {

  183.     int id;

  184. 

  185.     int type;

  186. 

  187.     DVBSubObjectDisplay *display_list;

  188. 

  189.     struct DVBSubObject *next;

  190. } DVBSubObject;

  191. 

  192. typedef struct DVBSubRegionDisplay {

  193.     int region_id;

  194. 

  195.     int x_pos;

  196.     int y_pos;

  197. 

  198.     struct DVBSubRegionDisplay *next;

  199. } DVBSubRegionDisplay;

  200. 

  201. typedef struct DVBSubRegion {

  202.     int id;

  203. 

  204.     int width;

  205.     int height;

  206.     int depth;

  207. 

  208.     int clut;

  209.     int bgcolor;

  210. 

  211.     uint8_t *pbuf;

  212.     int buf_size;

  213. 

  214.     DVBSubObjectDisplay *display_list;

  215. 

  216.     struct DVBSubRegion *next;

  217. } DVBSubRegion;

  218. 

  219. typedef struct DVBSubContext {

  220.     int composition_id;

  221.     int ancillary_id;

  222. 

  223.     int time_out;

  224.     DVBSubRegion *region_list;

  225.     DVBSubCLUT   *clut_list;

  226.     DVBSubObject *object_list;

  227. 

  228.     int display_list_size;

  229.     DVBSubRegionDisplay *display_list;

  230. } DVBSubContext;

  231. 

  232. 

  233. static DVBSubObject* get_object(DVBSubContext *ctx, int object_id)

  234. {

  235.     DVBSubObject *ptr = ctx->object_list;

  236. 

  237.     while (ptr && ptr->id != object_id) {

  238.         ptr = ptr->next;

  239.     }

  240. 

  241.     return ptr;

  242. }

  243. 

  244. static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id)

  245. {

  246.     DVBSubCLUT *ptr = ctx->clut_list;

  247. 

  248.     while (ptr && ptr->id != clut_id) {

  249.         ptr = ptr->next;

  250.     }

  251. 

  252.     return ptr;

  253. }

  254. 

  255. static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)

  256. {

  257.     DVBSubRegion *ptr = ctx->region_list;

  258. 

  259.     while (ptr && ptr->id != region_id) {

  260.         ptr = ptr->next;

  261.     }

  262. 

  263.     return ptr;

  264. }

  265. 

  266. static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)

  267. {

  268.     DVBSubObject *object, *obj2, **obj2_ptr;

  269.     DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr;

  270. 

  271.     while (region->display_list) {

  272.         display = region->display_list;

  273. 

  274.         object = get_object(ctx, display->object_id);

  275. 

  276.         if (object) {

  277.             obj_disp_ptr = &object->display_list;

  278.             obj_disp = *obj_disp_ptr;

  279. 

  280.             while (obj_disp && obj_disp != display) {

  281.                 obj_disp_ptr = &obj_disp->object_list_next;

  282.                 obj_disp = *obj_disp_ptr;

  283.             }

  284. 

  285.             if (obj_disp) {

  286.                 *obj_disp_ptr = obj_disp->object_list_next;

  287. 

  288.                 if (!object->display_list) {

  289.                     obj2_ptr = &ctx->object_list;

  290.                     obj2 = *obj2_ptr;

  291. 

  292.                     while (obj2 != object) {

  293.                         assert(obj2);

  294.                         obj2_ptr = &obj2->next;

  295.                         obj2 = *obj2_ptr;

  296.                     }

  297. 

  298.                     *obj2_ptr = obj2->next;

  299. 

  300.                     av_free(obj2);

  301.                 }

  302.             }

  303.         }

  304. 

  305.         region->display_list = display->region_list_next;

  306. 

  307.         av_free(display);

  308.     }

  309. 

  310. }

  311. 

  312. static void delete_state(DVBSubContext *ctx)

  313. {

  314.     DVBSubRegion *region;

  315.     DVBSubCLUT *clut;

  316. 

  317.     while (ctx->region_list) {

  318.         region = ctx->region_list;

  319. 

  320.         ctx->region_list = region->next;

  321. 

  322.         delete_region_display_list(ctx, region);

  323.         if (region->pbuf)

  324.             av_free(region->pbuf);

  325. 

  326.         av_free(region);

  327.     }

  328. 

  329.     while (ctx->clut_list) {

  330.         clut = ctx->clut_list;

  331. 

  332.         ctx->clut_list = clut->next;

  333. 

  334.         av_free(clut);

  335.     }

  336. 

  337.     /* Should already be null */

  338.     if (ctx->object_list)

  339.         av_log(0, AV_LOG_ERROR, "Memory deallocation error!\n");

  340. }

  341. 

  342. static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)

  343. {

  344.     int i, r, g, b, a = 0;

  345.     DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;

  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 av_cold 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) {

  423.         display = ctx->display_list;

  424.         ctx->display_list = display->next;

  425. 

  426.         av_free(display);

  427.     }

  428. 

  429.     return 0;

  430. }

  431. 

  432. static int dvbsub_read_2bit_string(uint8_t *destbuf, int dbuf_len,

  433.                                    const uint8_t **srcbuf, int buf_size,

  434.                                    int non_mod, uint8_t *map_table)

  435. {

  436.     GetBitContext gb;

  437. 

  438.     int bits;

  439.     int run_length;

  440.     int pixels_read = 0;

  441. 

  442.     init_get_bits(&gb, *srcbuf, buf_size << 3);

  443. 

  444.     while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {

  445.         bits = get_bits(&gb, 2);

  446. 

  447.         if (bits) {

  448.             if (non_mod != 1 || bits != 1) {

  449.                 if (map_table)

  450.                     *destbuf++ = map_table[bits];

  451.                 else

  452.                     *destbuf++ = bits;

  453.             }

  454.             pixels_read++;

  455.         } else {

  456.             bits = get_bits1(&gb);

  457.             if (bits == 1) {

  458.                 run_length = get_bits(&gb, 3) + 3;

  459.                 bits = get_bits(&gb, 2);

  460. 

  461.                 if (non_mod == 1 && bits == 1)

  462.                     pixels_read += run_length;

  463.                 else {

  464.                     if (map_table)

  465.                         bits = map_table[bits];

  466.                     while (run_length-- > 0 && pixels_read < dbuf_len) {

  467.                         *destbuf++ = bits;

  468.                         pixels_read++;

  469.                     }

  470.                 }

  471.             } else {

  472.                 bits = get_bits1(&gb);

  473.                 if (bits == 0) {

  474.                     bits = get_bits(&gb, 2);

  475.                     if (bits == 2) {

  476.                         run_length = get_bits(&gb, 4) + 12;

  477.                         bits = get_bits(&gb, 2);

  478. 

  479.                         if (non_mod == 1 && bits == 1)

  480.                             pixels_read += run_length;

  481.                         else {

  482.                             if (map_table)

  483.                                 bits = map_table[bits];

  484.                             while (run_length-- > 0 && pixels_read < dbuf_len) {

  485.                                 *destbuf++ = bits;

  486.                                 pixels_read++;

  487.                             }

  488.                         }

  489.                     } else if (bits == 3) {

  490.                         run_length = get_bits(&gb, 8) + 29;

  491.                         bits = get_bits(&gb, 2);

  492. 

  493.                         if (non_mod == 1 && bits == 1)

  494.                             pixels_read += run_length;

  495.                         else {

  496.                             if (map_table)

  497.                                 bits = map_table[bits];

  498.                             while (run_length-- > 0 && pixels_read < dbuf_len) {

  499.                                 *destbuf++ = bits;

  500.                                 pixels_read++;

  501.                             }

  502.                         }

  503.                     } else if (bits == 1) {

  504.                         pixels_read += 2;

  505.                         if (map_table)

  506.                             bits = map_table[0];

  507.                         else

  508.                             bits = 0;

  509.                         if (pixels_read <= dbuf_len) {

  510.                             *destbuf++ = bits;

  511.                             *destbuf++ = bits;

  512.                         }

  513.                     } else {

  514.                         (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;

  515.                         return pixels_read;

  516.                     }

  517.                 } else {

  518.                     if (map_table)

  519.                         bits = map_table[0];

  520.                     else

  521.                         bits = 0;

  522.                     *destbuf++ = bits;

  523.                     pixels_read++;

  524.                 }

  525.             }

  526.         }

  527.     }

  528. 

  529.     if (get_bits(&gb, 6))

  530.         av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");

  531. 

  532.     (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;

  533. 

  534.     return pixels_read;

  535. }

  536. 

  537. static int dvbsub_read_4bit_string(uint8_t *destbuf, int dbuf_len,

  538.                                    const uint8_t **srcbuf, int buf_size,

  539.                                    int non_mod, uint8_t *map_table)

  540. {

  541.     GetBitContext gb;

  542. 

  543.     int bits;

  544.     int run_length;

  545.     int pixels_read = 0;

  546. 

  547.     init_get_bits(&gb, *srcbuf, buf_size << 3);

  548. 

  549.     while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {

  550.         bits = get_bits(&gb, 4);

  551. 

  552.         if (bits) {

  553.             if (non_mod != 1 || bits != 1) {

  554.                 if (map_table)

  555.                     *destbuf++ = map_table[bits];

  556.                 else

  557.                     *destbuf++ = bits;

  558.             }

  559.             pixels_read++;

  560.         } else {

  561.             bits = get_bits1(&gb);

  562.             if (bits == 0) {

  563.                 run_length = get_bits(&gb, 3);

  564. 

  565.                 if (run_length == 0) {

  566.                     (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;

  567.                     return pixels_read;

  568.                 }

  569. 

  570.                 run_length += 2;

  571. 

  572.                 if (map_table)

  573.                     bits = map_table[0];

  574.                 else

  575.                     bits = 0;

  576. 

  577.                 while (run_length-- > 0 && pixels_read < dbuf_len) {

  578.                     *destbuf++ = bits;

  579.                     pixels_read++;

  580.                 }

  581.             } else {

  582.                 bits = get_bits1(&gb);

  583.                 if (bits == 0) {

  584.                     run_length = get_bits(&gb, 2) + 4;

  585.                     bits = get_bits(&gb, 4);

  586. 

  587.                     if (non_mod == 1 && bits == 1)

  588.                         pixels_read += run_length;

  589.                     else {

  590.                         if (map_table)

  591.                             bits = map_table[bits];

  592.                         while (run_length-- > 0 && pixels_read < dbuf_len) {

  593.                             *destbuf++ = bits;

  594.                             pixels_read++;

  595.                         }

  596.                     }

  597.                 } else {

  598.                     bits = get_bits(&gb, 2);

  599.                     if (bits == 2) {

  600.                         run_length = get_bits(&gb, 4) + 9;

  601.                         bits = get_bits(&gb, 4);

  602. 

  603.                         if (non_mod == 1 && bits == 1)

  604.                             pixels_read += run_length;

  605.                         else {

  606.                             if (map_table)

  607.                                 bits = map_table[bits];

  608.                             while (run_length-- > 0 && pixels_read < dbuf_len) {

  609.                                 *destbuf++ = bits;

  610.                                 pixels_read++;

  611.                             }

  612.                         }

  613.                     } else if (bits == 3) {

  614.                         run_length = get_bits(&gb, 8) + 25;

  615.                         bits = get_bits(&gb, 4);

  616. 

  617.                         if (non_mod == 1 && bits == 1)

  618.                             pixels_read += run_length;

  619.                         else {

  620.                             if (map_table)

  621.                                 bits = map_table[bits];

  622.                             while (run_length-- > 0 && pixels_read < dbuf_len) {

  623.                                 *destbuf++ = bits;

  624.                                 pixels_read++;

  625.                             }

  626.                         }

  627.                     } else if (bits == 1) {

  628.                         pixels_read += 2;

  629.                         if (map_table)

  630.                             bits = map_table[0];

  631.                         else

  632.                             bits = 0;

  633.                         if (pixels_read <= dbuf_len) {

  634.                             *destbuf++ = bits;

  635.                             *destbuf++ = bits;

  636.                         }

  637.                     } else {

  638.                         if (map_table)

  639.                             bits = map_table[0];

  640.                         else

  641.                             bits = 0;

  642.                         *destbuf++ = bits;

  643.                         pixels_read ++;

  644.                     }

  645.                 }

  646.             }

  647.         }

  648.     }

  649. 

  650.     if (get_bits(&gb, 8))

  651.         av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");

  652. 

  653.     (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;

  654. 

  655.     return pixels_read;

  656. }

  657. 

  658. static int dvbsub_read_8bit_string(uint8_t *destbuf, int dbuf_len,

  659.                                     const uint8_t **srcbuf, int buf_size,

  660.                                     int non_mod, uint8_t *map_table)

  661. {

  662.     const uint8_t *sbuf_end = (*srcbuf) + buf_size;

  663.     int bits;

  664.     int run_length;

  665.     int pixels_read = 0;

  666. 

  667.     while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {

  668.         bits = *(*srcbuf)++;

  669. 

  670.         if (bits) {

  671.             if (non_mod != 1 || bits != 1) {

  672.                 if (map_table)

  673.                     *destbuf++ = map_table[bits];

  674.                 else

  675.                     *destbuf++ = bits;

  676.             }

  677.             pixels_read++;

  678.         } else {

  679.             bits = *(*srcbuf)++;

  680.             run_length = bits & 0x7f;

  681.             if ((bits & 0x80) == 0) {

  682.                 if (run_length == 0) {

  683.                     return pixels_read;

  684.                 }

  685. 

  686.                 if (map_table)

  687.                     bits = map_table[0];

  688.                 else

  689.                     bits = 0;

  690.                 while (run_length-- > 0 && pixels_read < dbuf_len) {

  691.                     *destbuf++ = bits;

  692.                     pixels_read++;

  693.                 }

  694.             } else {

  695.                 bits = *(*srcbuf)++;

  696. 

  697.                 if (non_mod == 1 && bits == 1)

  698.                     pixels_read += run_length;

  699.                 if (map_table)

  700.                     bits = map_table[bits];

  701.                 else while (run_length-- > 0 && pixels_read < dbuf_len) {

  702.                     *destbuf++ = bits;

  703.                     pixels_read++;

  704.                 }

  705.             }

  706.         }

  707.     }

  708. 

  709.     if (*(*srcbuf)++)

  710.         av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");

  711. 

  712.     return pixels_read;

  713. }

  714. 

  715. 

  716. 

  717. static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,

  718.                                           const uint8_t *buf, int buf_size, int top_bottom, int non_mod)

  719. {

  720.     DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;

  721. 

  722.     DVBSubRegion *region = get_region(ctx, display->region_id);

  723.     const uint8_t *buf_end = buf + buf_size;

  724.     uint8_t *pbuf;

  725.     int x_pos, y_pos;

  726.     int i;

  727. 

  728.     uint8_t map2to4[] = { 0x0,  0x7,  0x8,  0xf};

  729.     uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};

  730.     uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,

  731.                          0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};

  732.     uint8_t *map_table;

  733. 

  734.     dprintf(avctx, "DVB pixel block size %d, %s field:\n", buf_size,

  735.             top_bottom ? "bottom" : "top");

  736. 

  737. #ifdef DEBUG_PACKET_CONTENTS

  738.     for (i = 0; i < buf_size; i++) {

  739.         if (i % 16 == 0)

  740.             av_log(avctx, AV_LOG_INFO, "0x%08p: ", buf+i);

  741. 

  742.         av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);

  743.         if (i % 16 == 15)

  744.             av_log(avctx, AV_LOG_INFO, "\n");

  745.     }

  746. 

  747.     if (i % 16)

  748.         av_log(avctx, AV_LOG_INFO, "\n");

  749. 

  750. #endif

  751. 

  752.     if (region == 0)

  753.         return;

  754. 

  755.     pbuf = region->pbuf;

  756. 

  757.     x_pos = display->x_pos;

  758.     y_pos = display->y_pos;

  759. 

  760.     if ((y_pos & 1) != top_bottom)

  761.         y_pos++;

  762. 

  763.     while (buf < buf_end) {

  764.         if (x_pos > region->width || y_pos > region->height) {

  765.             av_log(avctx, AV_LOG_ERROR, "Invalid object location!\n");

  766.             return;

  767.         }

  768. 

  769.         switch (*buf++) {

  770.         case 0x10:

  771.             if (region->depth == 8)

  772.                 map_table = map2to8;

  773.             else if (region->depth == 4)

  774.                 map_table = map2to4;

  775.             else

  776.                 map_table = NULL;

  777. 

  778.             x_pos += dvbsub_read_2bit_string(pbuf + (y_pos * region->width) + x_pos,

  779.                                                 region->width - x_pos, &buf, buf_size,

  780.                                                 non_mod, map_table);

  781.             break;

  782.         case 0x11:

  783.             if (region->depth < 4) {

  784.                 av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);

  785.                 return;

  786.             }

  787. 

  788.             if (region->depth == 8)

  789.                 map_table = map4to8;

  790.             else

  791.                 map_table = NULL;

  792. 

  793.             x_pos += dvbsub_read_4bit_string(pbuf + (y_pos * region->width) + x_pos,

  794.                                                 region->width - x_pos, &buf, buf_size,

  795.                                                 non_mod, map_table);

  796.             break;

  797.         case 0x12:

  798.             if (region->depth < 8) {

  799.                 av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);

  800.                 return;

  801.             }

  802. 

  803.             x_pos += dvbsub_read_8bit_string(pbuf + (y_pos * region->width) + x_pos,

  804.                                                 region->width - x_pos, &buf, buf_size,

  805.                                                 non_mod, NULL);

  806.             break;

  807. 

  808.         case 0x20:

  809.             map2to4[0] = (*buf) >> 4;

  810.             map2to4[1] = (*buf++) & 0xf;

  811.             map2to4[2] = (*buf) >> 4;

  812.             map2to4[3] = (*buf++) & 0xf;

  813.             break;

  814.         case 0x21:

  815.             for (i = 0; i < 4; i++)

  816.                 map2to8[i] = *buf++;

  817.             break;

  818.         case 0x22:

  819.             for (i = 0; i < 16; i++)

  820.                 map4to8[i] = *buf++;

  821.             break;

  822. 

  823.         case 0xf0:

  824.             x_pos = display->x_pos;

  825.             y_pos += 2;

  826.             break;

  827.         default:

  828.             av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));

  829.         }

  830.     }

  831. 

  832. }

  833. 

  834. static void dvbsub_parse_object_segment(AVCodecContext *avctx,

  835.                                         const uint8_t *buf, int buf_size)

  836. {

  837.     DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;

  838. 

  839.     const uint8_t *buf_end = buf + buf_size;

  840.     const uint8_t *block;

  841.     int object_id;

  842.     DVBSubObject *object;

  843.     DVBSubObjectDisplay *display;

  844.     int top_field_len, bottom_field_len;

  845. 

  846.     int coding_method, non_modifying_color;

  847. 

  848.     object_id = AV_RB16(buf);

  849.     buf += 2;

  850. 

  851.     object = get_object(ctx, object_id);

  852. 

  853.     if (!object)

  854.         return;

  855. 

  856.     coding_method = ((*buf) >> 2) & 3;

  857.     non_modifying_color = ((*buf++) >> 1) & 1;

  858. 

  859.     if (coding_method == 0) {

  860.         top_field_len = AV_RB16(buf);

  861.         buf += 2;

  862.         bottom_field_len = AV_RB16(buf);

  863.         buf += 2;

  864. 

  865.         if (buf + top_field_len + bottom_field_len > buf_end) {

  866.             av_log(avctx, AV_LOG_ERROR, "Field data size too large\n");

  867.             return;

  868.         }

  869. 

  870.         for (display = object->display_list; display; display = display->object_list_next) {

  871.             block = buf;

  872. 

  873.             dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,

  874.                                             non_modifying_color);

  875. 

  876.             if (bottom_field_len > 0)

  877.                 block = buf + top_field_len;

  878.             else

  879.                 bottom_field_len = top_field_len;

  880. 

  881.             dvbsub_parse_pixel_data_block(avctx, display, block, bottom_field_len, 1,

  882.                                             non_modifying_color);

  883.         }

  884. 

  885. /*  } else if (coding_method == 1) {*/

  886. 

  887.     } else {

  888.         av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);

  889.     }

  890. 

  891. }

  892. 

  893. static void dvbsub_parse_clut_segment(AVCodecContext *avctx,

  894.                                         const uint8_t *buf, int buf_size)

  895. {

  896.     DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;

  897. 

  898.     const uint8_t *buf_end = buf + buf_size;

  899.     int clut_id;

  900.     DVBSubCLUT *clut;

  901.     int entry_id, depth , full_range;

  902.     int y, cr, cb, alpha;

  903.     int r, g, b, r_add, g_add, b_add;

  904. 

  905. #ifdef DEBUG_PACKET_CONTENTS

  906.     int i;

  907. 

  908.     av_log(avctx, AV_LOG_INFO, "DVB clut packet:\n");

  909. 

  910.     for (i=0; i < buf_size; i++) {

  911.         av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);

  912.         if (i % 16 == 15)

  913.             av_log(avctx, AV_LOG_INFO, "\n");

  914.     }

  915. 

  916.     if (i % 16)

  917.         av_log(avctx, AV_LOG_INFO, "\n");

  918. 

  919. #endif

  920. 

  921.     clut_id = *buf++;

  922.     buf += 1;

  923. 

  924.     clut = get_clut(ctx, clut_id);

  925. 

  926.     if (!clut) {

  927.         clut = av_malloc(sizeof(DVBSubCLUT));

  928. 

  929.         memcpy(clut, &default_clut, sizeof(DVBSubCLUT));

  930. 

  931.         clut->id = clut_id;

  932. 

  933.         clut->next = ctx->clut_list;

  934.         ctx->clut_list = clut;

  935.     }

  936. 

  937.     while (buf + 4 < buf_end) {

  938.         entry_id = *buf++;

  939. 

  940.         depth = (*buf) & 0xe0;

  941. 

  942.         if (depth == 0) {

  943.             av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);

  944.             return;

  945.         }

  946. 

  947.         full_range = (*buf++) & 1;

  948. 

  949.         if (full_range) {

  950.             y = *buf++;

  951.             cr = *buf++;

  952.             cb = *buf++;

  953.             alpha = *buf++;

  954.         } else {

  955.             y = buf[0] & 0xfc;

  956.             cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;

  957.             cb = (buf[1] << 2) & 0xf0;

  958.             alpha = (buf[1] << 6) & 0xc0;

  959. 

  960.             buf += 2;

  961.         }

  962. 

  963.         if (y == 0)

  964.             alpha = 0xff;

  965. 

  966.         YUV_TO_RGB1_CCIR(cb, cr);

  967.         YUV_TO_RGB2_CCIR(r, g, b, y);

  968. 

  969.         dprintf(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);

  970. 

  971.         if (depth & 0x80)

  972.             clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);

  973.         if (depth & 0x40)

  974.             clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);

  975.         if (depth & 0x20)

  976.             clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);

  977.     }

  978. }

  979. 

  980. 

  981. static void dvbsub_parse_region_segment(AVCodecContext *avctx,

  982.                                         const uint8_t *buf, int buf_size)

  983. {

  984.     DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;

  985. 

  986.     const uint8_t *buf_end = buf + buf_size;

  987.     int region_id, object_id;

  988.     DVBSubRegion *region;

  989.     DVBSubObject *object;

  990.     DVBSubObjectDisplay *display;

  991.     int fill;

  992. 

  993.     if (buf_size < 10)

  994.         return;

  995. 

  996.     region_id = *buf++;

  997. 

  998.     region = get_region(ctx, region_id);

  999. 

  1000.     if (!region) {

  1001.         region = av_mallocz(sizeof(DVBSubRegion));

  1002. 

  1003.         region->id = region_id;

  1004. 

  1005.         region->next = ctx->region_list;

  1006.         ctx->region_list = region;

  1007.     }

  1008. 

  1009.     fill = ((*buf++) >> 3) & 1;

  1010. 

  1011.     region->width = AV_RB16(buf);

  1012.     buf += 2;

  1013.     region->height = AV_RB16(buf);

  1014.     buf += 2;

  1015. 

  1016.     if (region->width * region->height != region->buf_size) {

  1017.         if (region->pbuf)

  1018.             av_free(region->pbuf);

  1019. 

  1020.         region->buf_size = region->width * region->height;

  1021. 

  1022.         region->pbuf = av_malloc(region->buf_size);

  1023. 

  1024.         fill = 1;

  1025.     }

  1026. 

  1027.     region->depth = 1 << (((*buf++) >> 2) & 7);

  1028.     if(region->depth<2 || region->depth>8){

  1029.         av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth);

  1030.         region->depth= 4;

  1031.     }

  1032.     region->clut = *buf++;

  1033. 

  1034.     if (region->depth == 8)

  1035.         region->bgcolor = *buf++;

  1036.     else {

  1037.         buf += 1;

  1038. 

  1039.         if (region->depth == 4)

  1040.             region->bgcolor = (((*buf++) >> 4) & 15);

  1041.         else

  1042.             region->bgcolor = (((*buf++) >> 2) & 3);

  1043.     }

  1044. 

  1045.     dprintf(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height);

  1046. 

  1047.     if (fill) {

  1048.         memset(region->pbuf, region->bgcolor, region->buf_size);

  1049.         dprintf(avctx, "Fill region (%d)\n", region->bgcolor);

  1050.     }

  1051. 

  1052.     delete_region_display_list(ctx, region);

  1053. 

  1054.     while (buf + 5 < buf_end) {

  1055.         object_id = AV_RB16(buf);

  1056.         buf += 2;

  1057. 

  1058.         object = get_object(ctx, object_id);

  1059. 

  1060.         if (!object) {

  1061.             object = av_mallocz(sizeof(DVBSubObject));

  1062. 

  1063.             object->id = object_id;

  1064.             object->next = ctx->object_list;

  1065.             ctx->object_list = object;

  1066.         }

  1067. 

  1068.         object->type = (*buf) >> 6;

  1069. 

  1070.         display = av_mallocz(sizeof(DVBSubObjectDisplay));

  1071. 

  1072.         display->object_id = object_id;

  1073.         display->region_id = region_id;

  1074. 

  1075.         display->x_pos = AV_RB16(buf) & 0xfff;

  1076.         buf += 2;

  1077.         display->y_pos = AV_RB16(buf) & 0xfff;

  1078.         buf += 2;

  1079. 

  1080.         if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {

  1081.             display->fgcolor = *buf++;

  1082.             display->bgcolor = *buf++;

  1083.         }

  1084. 

  1085.         display->region_list_next = region->display_list;

  1086.         region->display_list = display;

  1087. 

  1088.         display->object_list_next = object->display_list;

  1089.         object->display_list = display;

  1090.     }

  1091. }

  1092. 

  1093. static void dvbsub_parse_page_segment(AVCodecContext *avctx,

  1094.                                         const uint8_t *buf, int buf_size)

  1095. {

  1096.     DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;

  1097.     DVBSubRegionDisplay *display;

  1098.     DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;

  1099. 

  1100.     const uint8_t *buf_end = buf + buf_size;

  1101.     int region_id;

  1102.     int page_state;

  1103. 

  1104.     if (buf_size < 1)

  1105.         return;

  1106. 

  1107.     ctx->time_out = *buf++;

  1108.     page_state = ((*buf++) >> 2) & 3;

  1109. 

  1110.     dprintf(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);

  1111. 

  1112.     if (page_state == 2) {

  1113.         delete_state(ctx);

  1114.     }

  1115. 

  1116.     tmp_display_list = ctx->display_list;

  1117.     ctx->display_list = NULL;

  1118.     ctx->display_list_size = 0;

  1119. 

  1120.     while (buf + 5 < buf_end) {

  1121.         region_id = *buf++;

  1122.         buf += 1;

  1123. 

  1124.         display = tmp_display_list;

  1125.         tmp_ptr = &tmp_display_list;

  1126. 

  1127.         while (display && display->region_id != region_id) {

  1128.             tmp_ptr = &display->next;

  1129.             display = display->next;

  1130.         }

  1131. 

  1132.         if (!display)

  1133.             display = av_mallocz(sizeof(DVBSubRegionDisplay));

  1134. 

  1135.         display->region_id = region_id;

  1136. 

  1137.         display->x_pos = AV_RB16(buf);

  1138.         buf += 2;

  1139.         display->y_pos = AV_RB16(buf);

  1140.         buf += 2;

  1141. 

  1142.         *tmp_ptr = display->next;

  1143. 

  1144.         display->next = ctx->display_list;

  1145.         ctx->display_list = display;

  1146.         ctx->display_list_size++;

  1147. 

  1148.         dprintf(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);

  1149.     }

  1150. 

  1151.     while (tmp_display_list) {

  1152.         display = tmp_display_list;

  1153. 

  1154.         tmp_display_list = display->next;

  1155. 

  1156.         av_free(display);

  1157.     }

  1158. 

  1159. }

  1160. 

  1161. 

  1162. #ifdef DEBUG_SAVE_IMAGES

  1163. static void save_display_set(DVBSubContext *ctx)

  1164. {

  1165.     DVBSubRegion *region;

  1166.     DVBSubRegionDisplay *display;

  1167.     DVBSubCLUT *clut;

  1168.     uint32_t *clut_table;

  1169.     int x_pos, y_pos, width, height;

  1170.     int x, y, y_off, x_off;

  1171.     uint32_t *pbuf;

  1172.     char filename[32];

  1173.     static int fileno_index = 0;

  1174. 

  1175.     x_pos = -1;

  1176.     y_pos = -1;

  1177.     width = 0;

  1178.     height = 0;

  1179. 

  1180.     for (display = ctx->display_list; display; display = display->next) {

  1181.         region = get_region(ctx, display->region_id);

  1182. 

  1183.         if (x_pos == -1) {

  1184.             x_pos = display->x_pos;

  1185.             y_pos = display->y_pos;

  1186.             width = region->width;

  1187.             height = region->height;

  1188.         } else {

  1189.             if (display->x_pos < x_pos) {

  1190.                 width += (x_pos - display->x_pos);

  1191.                 x_pos = display->x_pos;

  1192.             }

  1193. 

  1194.             if (display->y_pos < y_pos) {

  1195.                 height += (y_pos - display->y_pos);

  1196.                 y_pos = display->y_pos;

  1197.             }

  1198. 

  1199.             if (display->x_pos + region->width > x_pos + width) {

  1200.                 width = display->x_pos + region->width - x_pos;

  1201.             }

  1202. 

  1203.             if (display->y_pos + region->height > y_pos + height) {

  1204.                 height = display->y_pos + region->height - y_pos;

  1205.             }

  1206.         }

  1207.     }

  1208. 

  1209.     if (x_pos >= 0) {

  1210. 

  1211.         pbuf = av_malloc(width * height * 4);

  1212. 

  1213.         for (display = ctx->display_list; display; display = display->next) {

  1214.             region = get_region(ctx, display->region_id);

  1215. 

  1216.             x_off = display->x_pos - x_pos;

  1217.             y_off = display->y_pos - y_pos;

  1218. 

  1219.             clut = get_clut(ctx, region->clut);

  1220. 

  1221.             if (clut == 0)

  1222.                 clut = &default_clut;

  1223. 

  1224.             switch (region->depth) {

  1225.             case 2:

  1226.                 clut_table = clut->clut4;

  1227.                 break;

  1228.             case 8:

  1229.                 clut_table = clut->clut256;

  1230.                 break;

  1231.             case 4:

  1232.             default:

  1233.                 clut_table = clut->clut16;

  1234.                 break;

  1235.             }

  1236. 

  1237.             for (y = 0; y < region->height; y++) {

  1238.                 for (x = 0; x < region->width; x++) {

  1239.                     pbuf[((y + y_off) * width) + x_off + x] =

  1240.                         clut_table[region->pbuf[y * region->width + x]];

  1241.                 }

  1242.             }

  1243. 

  1244.         }

  1245. 

  1246.         snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index);

  1247. 

  1248.         png_save2(filename, pbuf, width, height);

  1249. 

  1250.         av_free(pbuf);

  1251.     }

  1252. 

  1253.     fileno_index++;

  1254. }

  1255. #endif

  1256. 

  1257. static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,

  1258.                                         int buf_size, AVSubtitle *sub)

  1259. {

  1260.     DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;

  1261. 

  1262.     DVBSubRegion *region;

  1263.     DVBSubRegionDisplay *display;

  1264.     AVSubtitleRect *rect;

  1265.     DVBSubCLUT *clut;

  1266.     uint32_t *clut_table;

  1267.     int i;

  1268. 

  1269.     sub->rects = NULL;

  1270.     sub->start_display_time = 0;

  1271.     sub->end_display_time = ctx->time_out * 1000;

  1272.     sub->format = 0;

  1273. 

  1274.     sub->num_rects = ctx->display_list_size;

  1275. 

  1276.     if (sub->num_rects > 0){

  1277.         sub->rects = av_mallocz(sizeof(*sub->rects) * sub->num_rects);

  1278.         for(i=0; i<sub->num_rects; i++)

  1279.             sub->rects[i] = av_mallocz(sizeof(*sub->rects[i]));

  1280.     }

  1281. 

  1282.     i = 0;

  1283. 

  1284.     for (display = ctx->display_list; display; display = display->next) {

  1285.         region = get_region(ctx, display->region_id);

  1286.         rect = sub->rects[i];

  1287. 

  1288.         if (!region)

  1289.             continue;

  1290. 

  1291.         rect->x = display->x_pos;

  1292.         rect->y = display->y_pos;

  1293.         rect->w = region->width;

  1294.         rect->h = region->height;

  1295.         rect->nb_colors = 16;

  1296.         rect->type      = SUBTITLE_BITMAP;

  1297.         rect->pict.linesize[0] = region->width;

  1298. 

  1299.         clut = get_clut(ctx, region->clut);

  1300. 

  1301.         if (!clut)

  1302.             clut = &default_clut;

  1303. 

  1304.         switch (region->depth) {

  1305.         case 2:

  1306.             clut_table = clut->clut4;

  1307.             break;

  1308.         case 8:

  1309.             clut_table = clut->clut256;

  1310.             break;

  1311.         case 4:

  1312.         default:

  1313.             clut_table = clut->clut16;

  1314.             break;

  1315.         }

  1316. 

  1317.         rect->pict.data[1] = av_mallocz(AVPALETTE_SIZE);

  1318.         memcpy(rect->pict.data[1], clut_table, (1 << region->depth) * sizeof(uint32_t));

  1319. 

  1320.         rect->pict.data[0] = av_malloc(region->buf_size);

  1321.         memcpy(rect->pict.data[0], region->pbuf, region->buf_size);

  1322. 

  1323.         i++;

  1324.     }

  1325. 

  1326.     sub->num_rects = i;

  1327. 

  1328. #ifdef DEBUG_SAVE_IMAGES

  1329.     save_display_set(ctx);

  1330. #endif

  1331. 

  1332.     return 1;

  1333. }

  1334. 

  1335. static int dvbsub_decode(AVCodecContext *avctx,

  1336.                          void *data, int *data_size,

  1337.                          AVPacket *avpkt)

  1338. {

  1339.     const uint8_t *buf = avpkt->data;

  1340.     int buf_size = avpkt->size;

  1341.     DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;

  1342.     AVSubtitle *sub = (AVSubtitle*) data;

  1343.     const uint8_t *p, *p_end;

  1344.     int segment_type;

  1345.     int page_id;

  1346.     int segment_length;

  1347. 

  1348. #ifdef DEBUG_PACKET_CONTENTS

  1349.     int i;

  1350. 

  1351.     av_log(avctx, AV_LOG_INFO, "DVB sub packet:\n");

  1352. 

  1353.     for (i=0; i < buf_size; i++) {

  1354.         av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);

  1355.         if (i % 16 == 15)

  1356.             av_log(avctx, AV_LOG_INFO, "\n");

  1357.     }

  1358. 

  1359.     if (i % 16)

  1360.         av_log(avctx, AV_LOG_INFO, "\n");

  1361. 

  1362. #endif

  1363. 

  1364.     if (buf_size <= 2)

  1365.         return -1;

  1366. 

  1367.     p = buf;

  1368.     p_end = buf + buf_size;

  1369. 

  1370.     while (p < p_end && *p == 0x0f) {

  1371.         p += 1;

  1372.         segment_type = *p++;

  1373.         page_id = AV_RB16(p);

  1374.         p += 2;

  1375.         segment_length = AV_RB16(p);

  1376.         p += 2;

  1377. 

  1378.         if (page_id == ctx->composition_id || page_id == ctx->ancillary_id) {

  1379.             switch (segment_type) {

  1380.             case DVBSUB_PAGE_SEGMENT:

  1381.                 dvbsub_parse_page_segment(avctx, p, segment_length);

  1382.                 break;

  1383.             case DVBSUB_REGION_SEGMENT:

  1384.                 dvbsub_parse_region_segment(avctx, p, segment_length);

  1385.                 break;

  1386.             case DVBSUB_CLUT_SEGMENT:

  1387.                 dvbsub_parse_clut_segment(avctx, p, segment_length);

  1388.                 break;

  1389.             case DVBSUB_OBJECT_SEGMENT:

  1390.                 dvbsub_parse_object_segment(avctx, p, segment_length);

  1391.                 break;

  1392.             case DVBSUB_DISPLAY_SEGMENT:

  1393.                 *data_size = dvbsub_display_end_segment(avctx, p, segment_length, sub);

  1394.                 break;

  1395.             default:

  1396.                 dprintf(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",

  1397.                         segment_type, page_id, segment_length);

  1398.                 break;

  1399.             }

  1400.         }

  1401. 

  1402.         p += segment_length;

  1403.     }

  1404. 

  1405.     if (p != p_end) {

  1406.         dprintf(avctx, "Junk at end of packet\n");

  1407.         return -1;

  1408.     }

  1409. 

  1410.     return buf_size;

  1411. }

  1412. 

  1413. 

  1414. AVCodec dvbsub_decoder = {

  1415.     "dvbsub",

  1416.     CODEC_TYPE_SUBTITLE,

  1417.     CODEC_ID_DVB_SUBTITLE,

  1418.     sizeof(DVBSubContext),

  1419.     dvbsub_init_decoder,

  1420.     NULL,

  1421.     dvbsub_close_decoder,

  1422.     dvbsub_decode,

  1423.     .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),

  1424. };