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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 faxcompr.c

  25.  * @author Konstantin Shishkov

  26.  */

  27. #include "avcodec.h"

  28. #include "bitstream.h"

  29. #include "faxcompr.h"

  30. 

  31. #define CCITT_SYMS 104

  32. 

  33. static const uint16_t ccitt_syms[CCITT_SYMS] = {

  34.     0,    1,    2,    3,    4,    5,    6,    7,    8,    9,   10,   11,   12,

  35.    13,   14,   15,   16,   17,   18,   19,   20,   21,   22,   23,   24,   25,

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

  37.    39,   40,   41,   42,   43,   44,   45,   46,   47,   48,   49,   50,   51,

  38.    52,   53,   54,   55,   56,   57,   58,   59,   60,   61,   62,   63,   64,

  39.   128,  192,  256,  320,  384,  448,  512,  576,  640,  704,  768,  832,  896,

  40.   960, 1024, 1088, 1152, 1216, 1280, 1344, 1408, 1472, 1536, 1600, 1664, 1728,

  41.  1792, 1856, 1920, 1984, 2048, 2112, 2176, 2240, 2304, 2368, 2432, 2496, 2560

  42. };

  43. 

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

  45. {

  46.   {

  47.     0x35, 0x07, 0x07, 0x08, 0x0B, 0x0C, 0x0E, 0x0F, 0x13, 0x14, 0x07, 0x08, 0x08,

  48.     0x03, 0x34, 0x35, 0x2A, 0x2B, 0x27, 0x0C, 0x08, 0x17, 0x03, 0x04, 0x28, 0x2B,

  49.     0x13, 0x24, 0x18, 0x02, 0x03, 0x1A, 0x1B, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,

  50.     0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x04, 0x05, 0x0A, 0x0B, 0x52, 0x53, 0x54,

  51.     0x55, 0x24, 0x25, 0x58, 0x59, 0x5A, 0x5B, 0x4A, 0x4B, 0x32, 0x33, 0x34, 0x1B,

  52.     0x12, 0x17, 0x37, 0x36, 0x37, 0x64, 0x65, 0x68, 0x67, 0xCC, 0xCD, 0xD2, 0xD3,

  53.     0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0x98, 0x99, 0x9A, 0x18, 0x9B,

  54.     0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F

  55.   },

  56.   {

  57.     0x37, 0x02, 0x03, 0x02, 0x03, 0x03, 0x02, 0x03, 0x05, 0x04, 0x04, 0x05, 0x07,

  58.     0x04, 0x07, 0x18, 0x17, 0x18, 0x08, 0x67, 0x68, 0x6C, 0x37, 0x28, 0x17, 0x18,

  59.     0xCA, 0xCB, 0xCC, 0xCD, 0x68, 0x69, 0x6A, 0x6B, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6,

  60.     0xD7, 0x6C, 0x6D, 0xDA, 0xDB, 0x54, 0x55, 0x56, 0x57, 0x64, 0x65, 0x52, 0x53,

  61.     0x24, 0x37, 0x38, 0x27, 0x28, 0x58, 0x59, 0x2B, 0x2C, 0x5A, 0x66, 0x67, 0x0F,

  62.     0xC8, 0xC9, 0x5B, 0x33, 0x34, 0x35, 0x6C, 0x6D, 0x4A, 0x4B, 0x4C, 0x4D, 0x72,

  63.     0x73, 0x74, 0x75, 0x76, 0x77, 0x52, 0x53, 0x54, 0x55, 0x5A, 0x5B, 0x64, 0x65,

  64.     0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F

  65.   }

  66. };

  67. 

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

  69. {

  70.   {

  71.      8,  6,  4,  4,  4,  4,  4,  4,  5,  5,  5,  5,  6,  6,  6,  6,  6,  6,  7,  7,

  72.      7,  7,  7,  7,  7,  7,  7,  7,  7,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,

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

  74.      8,  8,  8,  8,  5,  5,  6,  7,  8,  8,  8,  8,  8,  8,  9,  9,  9,  9,  9,  9,

  75.      9,  9,  9,  9,  9,  9,  9,  9,  9,  6,  9, 11, 11, 11, 12, 12, 12, 12, 12, 12,

  76.     12, 12, 12, 12

  77.   },

  78.   {

  79.     10,  3,  2,  2,  3,  4,  4,  5,  6,  6,  7,  7,  7,  8,  8,  9, 10, 10, 10, 11,

  80.     11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,

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

  82.     12, 12, 12, 12, 10, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13,

  83.     13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 11, 11, 11, 12, 12, 12, 12, 12, 12,

  84.     12, 12, 12, 12

  85.   }

  86. };

  87. 

  88. static const uint8_t ccitt_group3_2d_bits[11] = {

  89.     1, 1, 2, 2, 2, 1, 3, 3, 3, 1, 1

  90. };

  91. 

  92. static const uint8_t ccitt_group3_2d_lens[11] = {

  93.     4, 3, 7, 6, 3, 1, 3, 6, 7, 7, 9

  94. };

  95. 

  96. static VLC ccitt_vlc[2], ccitt_group3_2d_vlc;

  97. 

  98. av_cold void ff_ccitt_unpack_init()

  99. {

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

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

  102.     int i;

  103.     static int initialized = 0;

  104. 

  105.     if(initialized)

  106.         return;

  107.     ccitt_vlc[0].table = code_table1;

  108.     ccitt_vlc[0].table_allocated = 528;

  109.     ccitt_vlc[1].table = code_table2;

  110.     ccitt_vlc[1].table_allocated = 648;

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

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

  113.                         ccitt_codes_lens[i], 1, 1,

  114.                         ccitt_codes_bits[i], 1, 1,

  115.                         ccitt_syms, 2, 2,

  116.                         INIT_VLC_USE_NEW_STATIC);

  117.     }

  118.     INIT_VLC_STATIC(&ccitt_group3_2d_vlc, 9, 11,

  119.                     ccitt_group3_2d_lens, 1, 1,

  120.                     ccitt_group3_2d_bits, 1, 1, 512);

  121.     initialized = 1;

  122. }

  123. 

  124. 

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

  126.                                  int pix_left, int *runs)

  127. {

  128.     int mode = 0, run = 0;

  129.     unsigned int t;

  130.     for(;;){

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

  132.         run += t;

  133.         if(t < 64){

  134.             pix_left -= run;

  135.             *runs++ = run;

  136.             if(pix_left <= 0){

  137.                 if(!pix_left)

  138.                     break;

  139.                 runs[-1] += pix_left;

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

  141.                 return -1;

  142.             }

  143.             run = 0;

  144.             mode = !mode;

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

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

  147.             return -1;

  148.         }

  149.     }

  150.     *runs++ = 0;

  151.     return 0;

  152. }

  153. 

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

  155.                                  int pix_left, int *runs, const int *ref)

  156. {

  157.     int mode = 0, offs = 0, run = 0, saved_run = 0, t;

  158.     int run_off = *ref++;

  159.     int *run_start = runs;

  160. 

  161.     while(pix_left > 0){

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

  163.         if(cmode == -1){

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

  165.             return -1;

  166.         }

  167.         //sync line pointers

  168.         if(runs != run_start)while(run_off <= offs && run_off < avctx->width){

  169.             run_off += *ref++;

  170.             run_off += *ref++;

  171.         }

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

  173.             run_off += *ref++;

  174.             run = run_off - offs;

  175.             run_off += *ref++;

  176.             pix_left -= run;

  177.             if(pix_left < 0){

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

  179.                 return -1;

  180.             }

  181.             offs += run;

  182.             saved_run += run;

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

  184.             int k;

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

  186.                 run = 0;

  187.                 for(;;){

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

  189.                     if(t == -1){

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

  191.                         return -1;

  192.                     }

  193.                     run += t;

  194.                     if(t < 64)

  195.                         break;

  196.                 }

  197.                 *runs++ = run + saved_run;

  198.                 saved_run = 0;

  199.                 if(pix_left < run){

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

  201.                     return -1;

  202.                 }

  203.                 pix_left -= run;

  204.                 offs += run;

  205.                 mode = !mode;

  206.             }

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

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

  209.             return -1;

  210.         }else{//vertical mode

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

  212.             if(cmode >= 5)

  213.                 run_off += *ref++;

  214.             else

  215.                 run_off -= *--ref;

  216.             pix_left -= run;

  217.             if(pix_left < 0){

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

  219.                 return -1;

  220.             }

  221.             offs += run;

  222.             *runs++ = run + saved_run;

  223.             saved_run = 0;

  224.             mode = !mode;

  225.         }

  226.     }

  227.     *runs++ = saved_run;

  228.     *runs++ = 0;

  229.     return 0;

  230. }

  231. 

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

  233. {

  234.     PutBitContext pb;

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

  236. 

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

  238.     while(pix_left > 0){

  239.         run = runs[run_idx++];

  240.         mode = ~mode;

  241.         pix_left -= run;

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

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

  244.         if(run)

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

  246.     }

  247. }

  248. 

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

  250. {

  251.     unsigned int state = -1;

  252.     srcsize -= get_bits_count(gb);

  253.     while(srcsize-- > 0){

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

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

  256.             return 0;

  257.     }

  258.     return -1;

  259. }

  260. 

  261. int ff_ccitt_unpack(AVCodecContext *avctx,

  262.                        const uint8_t *src, int srcsize,

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

  264. {

  265.     int j;

  266.     GetBitContext gb;

  267.     int *runs, *ref;

  268.     int ret;

  269. 

  270.     runs = av_malloc((avctx->width + 2) * sizeof(runs[0]));

  271.     ref  = av_malloc((avctx->width + 2) * sizeof(ref[0]));

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

  273.     ref[1] = 0;

  274.     ref[2] = 0;

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

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

  277.         if(compr == TIFF_G4){

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

  279.             if(ret < 0){

  280.                 av_free(runs);

  281.                 av_free(ref);

  282.                 return -1;

  283.             }

  284.         }else{

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

  286.                 break;

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

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

  289.             else

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

  291.         }

  292.         if(ret < 0){

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

  294.         }else{

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

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

  297.         }

  298.         dst += stride;

  299.     }

  300.     av_free(runs);

  301.     av_free(ref);

  302.     return 0;

  303. }