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FFmpeg/libavcodec/faxcompr.c

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  1. /*

  2.  * CCITT Fax Group 3 and 4 decompression

  3.  * Copyright (c) 2008 Konstantin Shishkov

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /**

  23.  * CCITT Fax Group 3 and 4 decompression

  24.  * @file libavcodec/faxcompr.c

  25.  * @author Konstantin Shishkov

  26.  */

  27. #include "avcodec.h"

  28. #include "get_bits.h"

  29. #include "put_bits.h"

  30. #include "faxcompr.h"

  31. 

  32. #define CCITT_SYMS 104

  33. 

  34. static const uint16_t ccitt_syms[CCITT_SYMS] = {

  35.     0,    1,    2,    3,    4,    5,    6,    7,    8,    9,   10,   11,   12,

  36.    13,   14,   15,   16,   17,   18,   19,   20,   21,   22,   23,   24,   25,

  37.    26,   27,   28,   29,   30,   31,   32,   33,   34,   35,   36,   37,   38,

  38.    39,   40,   41,   42,   43,   44,   45,   46,   47,   48,   49,   50,   51,

  39.    52,   53,   54,   55,   56,   57,   58,   59,   60,   61,   62,   63,   64,

  40.   128,  192,  256,  320,  384,  448,  512,  576,  640,  704,  768,  832,  896,

  41.   960, 1024, 1088, 1152, 1216, 1280, 1344, 1408, 1472, 1536, 1600, 1664, 1728,

  42.  1792, 1856, 1920, 1984, 2048, 2112, 2176, 2240, 2304, 2368, 2432, 2496, 2560

  43. };

  44. 

  45. static const uint8_t ccitt_codes_bits[2][CCITT_SYMS] =

  46. {

  47.   {

  48.     0x35, 0x07, 0x07, 0x08, 0x0B, 0x0C, 0x0E, 0x0F, 0x13, 0x14, 0x07, 0x08, 0x08,

  49.     0x03, 0x34, 0x35, 0x2A, 0x2B, 0x27, 0x0C, 0x08, 0x17, 0x03, 0x04, 0x28, 0x2B,

  50.     0x13, 0x24, 0x18, 0x02, 0x03, 0x1A, 0x1B, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,

  51.     0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x04, 0x05, 0x0A, 0x0B, 0x52, 0x53, 0x54,

  52.     0x55, 0x24, 0x25, 0x58, 0x59, 0x5A, 0x5B, 0x4A, 0x4B, 0x32, 0x33, 0x34, 0x1B,

  53.     0x12, 0x17, 0x37, 0x36, 0x37, 0x64, 0x65, 0x68, 0x67, 0xCC, 0xCD, 0xD2, 0xD3,

  54.     0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0x98, 0x99, 0x9A, 0x18, 0x9B,

  55.     0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F

  56.   },

  57.   {

  58.     0x37, 0x02, 0x03, 0x02, 0x03, 0x03, 0x02, 0x03, 0x05, 0x04, 0x04, 0x05, 0x07,

  59.     0x04, 0x07, 0x18, 0x17, 0x18, 0x08, 0x67, 0x68, 0x6C, 0x37, 0x28, 0x17, 0x18,

  60.     0xCA, 0xCB, 0xCC, 0xCD, 0x68, 0x69, 0x6A, 0x6B, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6,

  61.     0xD7, 0x6C, 0x6D, 0xDA, 0xDB, 0x54, 0x55, 0x56, 0x57, 0x64, 0x65, 0x52, 0x53,

  62.     0x24, 0x37, 0x38, 0x27, 0x28, 0x58, 0x59, 0x2B, 0x2C, 0x5A, 0x66, 0x67, 0x0F,

  63.     0xC8, 0xC9, 0x5B, 0x33, 0x34, 0x35, 0x6C, 0x6D, 0x4A, 0x4B, 0x4C, 0x4D, 0x72,

  64.     0x73, 0x74, 0x75, 0x76, 0x77, 0x52, 0x53, 0x54, 0x55, 0x5A, 0x5B, 0x64, 0x65,

  65.     0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F

  66.   }

  67. };

  68. 

  69. static const uint8_t ccitt_codes_lens[2][CCITT_SYMS] =

  70. {

  71.   {

  72.      8,  6,  4,  4,  4,  4,  4,  4,  5,  5,  5,  5,  6,  6,  6,  6,  6,  6,  7,  7,

  73.      7,  7,  7,  7,  7,  7,  7,  7,  7,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,

  74.      8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,

  75.      8,  8,  8,  8,  5,  5,  6,  7,  8,  8,  8,  8,  8,  8,  9,  9,  9,  9,  9,  9,

  76.      9,  9,  9,  9,  9,  9,  9,  9,  9,  6,  9, 11, 11, 11, 12, 12, 12, 12, 12, 12,

  77.     12, 12, 12, 12

  78.   },

  79.   {

  80.     10,  3,  2,  2,  3,  4,  4,  5,  6,  6,  7,  7,  7,  8,  8,  9, 10, 10, 10, 11,

  81.     11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,

  82.     12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,

  83.     12, 12, 12, 12, 10, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13,

  84.     13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 11, 11, 11, 12, 12, 12, 12, 12, 12,

  85.     12, 12, 12, 12

  86.   }

  87. };

  88. 

  89. static const uint8_t ccitt_group3_2d_bits[11] = {

  90.     1, 1, 2, 2, 2, 1, 3, 3, 3, 1, 1

  91. };

  92. 

  93. static const uint8_t ccitt_group3_2d_lens[11] = {

  94.     4, 3, 7, 6, 3, 1, 3, 6, 7, 7, 9

  95. };

  96. 

  97. static VLC ccitt_vlc[2], ccitt_group3_2d_vlc;

  98. 

  99. av_cold void ff_ccitt_unpack_init(void)

  100. {

  101.     static VLC_TYPE code_table1[528][2];

  102.     static VLC_TYPE code_table2[648][2];

  103.     int i;

  104.     static int initialized = 0;

  105. 

  106.     if(initialized)

  107.         return;

  108.     ccitt_vlc[0].table = code_table1;

  109.     ccitt_vlc[0].table_allocated = 528;

  110.     ccitt_vlc[1].table = code_table2;

  111.     ccitt_vlc[1].table_allocated = 648;

  112.     for(i = 0; i < 2; i++){

  113.         init_vlc_sparse(&ccitt_vlc[i], 9, CCITT_SYMS,

  114.                         ccitt_codes_lens[i], 1, 1,

  115.                         ccitt_codes_bits[i], 1, 1,

  116.                         ccitt_syms, 2, 2,

  117.                         INIT_VLC_USE_NEW_STATIC);

  118.     }

  119.     INIT_VLC_STATIC(&ccitt_group3_2d_vlc, 9, 11,

  120.                     ccitt_group3_2d_lens, 1, 1,

  121.                     ccitt_group3_2d_bits, 1, 1, 512);

  122.     initialized = 1;

  123. }

  124. 

  125. 

  126. static int decode_group3_1d_line(AVCodecContext *avctx, GetBitContext *gb,

  127.                                  unsigned int pix_left, int *runs, const int *runend)

  128. {

  129.     int mode = 0;

  130.     unsigned int run=0;

  131.     unsigned int t;

  132.     for(;;){

  133.         t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);

  134.         run += t;

  135.         if(t < 64){

  136.             *runs++ = run;

  137.             if(runs >= runend){

  138.                 av_log(avctx, AV_LOG_ERROR, "Run overrun\n");

  139.                 return -1;

  140.             }

  141.             if(pix_left <= run){

  142.                 if(pix_left == run)

  143.                     break;

  144.                 av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");

  145.                 return -1;

  146.             }

  147.             pix_left -= run;

  148.             run = 0;

  149.             mode = !mode;

  150.         }else if((int)t == -1){

  151.             av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");

  152.             return -1;

  153.         }

  154.     }

  155.     *runs++ = 0;

  156.     return 0;

  157. }

  158. 

  159. static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb,

  160.                                  unsigned int width, int *runs, const int *runend, const int *ref)

  161. {

  162.     int mode = 0, saved_run = 0, t;

  163.     int run_off = *ref++;

  164.     unsigned int offs=0, run= 0;

  165. 

  166.     runend--; // for the last written 0

  167. 

  168.     while(offs < width){

  169.         int cmode = get_vlc2(gb, ccitt_group3_2d_vlc.table, 9, 1);

  170.         if(cmode == -1){

  171.             av_log(avctx, AV_LOG_ERROR, "Incorrect mode VLC\n");

  172.             return -1;

  173.         }

  174.         if(!cmode){//pass mode

  175.             run_off += *ref++;

  176.             run = run_off - offs;

  177.             offs= run_off;

  178.             run_off += *ref++;

  179.             if(offs > width){

  180.                 av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");

  181.                 return -1;

  182.             }

  183.             saved_run += run;

  184.         }else if(cmode == 1){//horizontal mode

  185.             int k;

  186.             for(k = 0; k < 2; k++){

  187.                 run = 0;

  188.                 for(;;){

  189.                     t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);

  190.                     if(t == -1){

  191.                         av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");

  192.                         return -1;

  193.                     }

  194.                     run += t;

  195.                     if(t < 64)

  196.                         break;

  197.                 }

  198.                 *runs++ = run + saved_run;

  199.                 if(runs >= runend){

  200.                     av_log(avctx, AV_LOG_ERROR, "Run overrun\n");

  201.                     return -1;

  202.                 }

  203.                 saved_run = 0;

  204.                 offs += run;

  205.                 if(offs > width || run > width){

  206.                     av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");

  207.                     return -1;

  208.                 }

  209.                 mode = !mode;

  210.             }

  211.         }else if(cmode == 9 || cmode == 10){

  212.             av_log(avctx, AV_LOG_ERROR, "Special modes are not supported (yet)\n");

  213.             return -1;

  214.         }else{//vertical mode

  215.             run = run_off - offs + (cmode - 5);

  216.             run_off -= *--ref;

  217.             offs += run;

  218.             if(offs > width || run > width){

  219.                 av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");

  220.                 return -1;

  221.             }

  222.             *runs++ = run + saved_run;

  223.             if(runs >= runend){

  224.                 av_log(avctx, AV_LOG_ERROR, "Run overrun\n");

  225.                 return -1;

  226.             }

  227.             saved_run = 0;

  228.             mode = !mode;

  229.         }

  230.         //sync line pointers

  231.         while(run_off <= offs){

  232.             run_off += *ref++;

  233.             run_off += *ref++;

  234.         }

  235.     }

  236.     *runs++ = saved_run;

  237.     *runs++ = 0;

  238.     return 0;

  239. }

  240. 

  241. static void put_line(uint8_t *dst, int size, int width, const int *runs)

  242. {

  243.     PutBitContext pb;

  244.     int run, mode = ~0, pix_left = width, run_idx = 0;

  245. 

  246.     init_put_bits(&pb, dst, size*8);

  247.     while(pix_left > 0){

  248.         run = runs[run_idx++];

  249.         mode = ~mode;

  250.         pix_left -= run;

  251.         for(; run > 16; run -= 16)

  252.             put_sbits(&pb, 16, mode);

  253.         if(run)

  254.             put_sbits(&pb, run, mode);

  255.     }

  256. }

  257. 

  258. static int find_group3_syncmarker(GetBitContext *gb, int srcsize)

  259. {

  260.     unsigned int state = -1;

  261.     srcsize -= get_bits_count(gb);

  262.     while(srcsize-- > 0){

  263.         state+= state + get_bits1(gb);

  264.         if((state & 0xFFF) == 1)

  265.             return 0;

  266.     }

  267.     return -1;

  268. }

  269. 

  270. int ff_ccitt_unpack(AVCodecContext *avctx,

  271.                        const uint8_t *src, int srcsize,

  272.                        uint8_t *dst, int height, int stride, enum TiffCompr compr)

  273. {

  274.     int j;

  275.     GetBitContext gb;

  276.     int *runs, *ref, *runend;

  277.     int ret;

  278.     int runsize= avctx->width + 2;

  279. 

  280.     runs = av_malloc(runsize * sizeof(runs[0]));

  281.     ref  = av_malloc(runsize * sizeof(ref[0]));

  282.     ref[0] = avctx->width;

  283.     ref[1] = 0;

  284.     ref[2] = 0;

  285.     init_get_bits(&gb, src, srcsize*8);

  286.     for(j = 0; j < height; j++){

  287.         runend = runs + runsize;

  288.         if(compr == TIFF_G4){

  289.             ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend, ref);

  290.             if(ret < 0){

  291.                 av_free(runs);

  292.                 av_free(ref);

  293.                 return -1;

  294.             }

  295.         }else{

  296.             if(find_group3_syncmarker(&gb, srcsize*8) < 0)

  297.                 break;

  298.             if(compr==TIFF_CCITT_RLE || get_bits1(&gb))

  299.                 ret = decode_group3_1d_line(avctx, &gb, avctx->width, runs, runend);

  300.             else

  301.                 ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend, ref);

  302.         }

  303.         if(ret < 0){

  304.             put_line(dst, stride, avctx->width, ref);

  305.         }else{

  306.             put_line(dst, stride, avctx->width, runs);

  307.             FFSWAP(int*, runs, ref);

  308.         }

  309.         dst += stride;

  310.     }

  311.     av_free(runs);

  312.     av_free(ref);

  313.     return 0;

  314. }