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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.  * @file

  24.  * CCITT Fax Group 3 and 4 decompression

  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.         ff_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.     while(offs < width){

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

  168.         if(cmode == -1){

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

  170.             return -1;

  171.         }

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

  173.             run_off += *ref++;

  174.             run = run_off - offs;

  175.             offs= run_off;

  176.             run_off += *ref++;

  177.             if(offs > width){

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

  179.                 return -1;

  180.             }

  181.             saved_run += run;

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

  183.             int k;

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

  185.                 run = 0;

  186.                 for(;;){

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

  188.                     if(t == -1){

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

  190.                         return -1;

  191.                     }

  192.                     run += t;

  193.                     if(t < 64)

  194.                         break;

  195.                 }

  196.                 *runs++ = run + saved_run;

  197.                 if(runs >= runend){

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

  199.                     return -1;

  200.                 }

  201.                 saved_run = 0;

  202.                 offs += run;

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

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

  205.                     return -1;

  206.                 }

  207.                 mode = !mode;

  208.             }

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

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

  211.             return -1;

  212.         }else{//vertical mode

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

  214.             run_off -= *--ref;

  215.             offs += run;

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

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

  218.                 return -1;

  219.             }

  220.             *runs++ = run + saved_run;

  221.             if(runs >= runend){

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

  223.                 return -1;

  224.             }

  225.             saved_run = 0;

  226.             mode = !mode;

  227.         }

  228.         //sync line pointers

  229.         while(offs < width && run_off <= offs){

  230.             run_off += *ref++;

  231.             run_off += *ref++;

  232.         }

  233.     }

  234.     *runs++ = saved_run;

  235.     if (saved_run) {

  236.         if(runs >= runend){

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

  238.             return -1;

  239.         }

  240.         *runs++ = 0;

  241.     }

  242.     return 0;

  243. }

  244. 

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

  246. {

  247.     PutBitContext pb;

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

  249. 

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

  251.     while(pix_left > 0){

  252.         run = runs[run_idx++];

  253.         mode = ~mode;

  254.         pix_left -= run;

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

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

  257.         if(run)

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

  259.     }

  260.     flush_put_bits(&pb);

  261. }

  262. 

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

  264. {

  265.     unsigned int state = -1;

  266.     srcsize -= get_bits_count(gb);

  267.     while(srcsize-- > 0){

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

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

  270.             return 0;

  271.     }

  272.     return -1;

  273. }

  274. 

  275. int ff_ccitt_unpack(AVCodecContext *avctx,

  276.                     const uint8_t *src, int srcsize,

  277.                     uint8_t *dst, int height, int stride,

  278.                     enum TiffCompr compr, int opts)

  279. {

  280.     int j;

  281.     GetBitContext gb;

  282.     int *runs, *ref = NULL, *runend;

  283.     int ret;

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

  285.     int err = 0;

  286.     int has_eol;

  287. 

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

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

  290.     if (!runs || ! ref) {

  291.         err = AVERROR(ENOMEM);

  292.         goto fail;

  293.     }

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

  295.     ref[1] = 0;

  296.     ref[2] = 0;

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

  298.     has_eol = show_bits(&gb, 12) == 1 || show_bits(&gb, 16) == 1;

  299. 

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

  301.         runend = runs + runsize;

  302.         if(compr == TIFF_G4){

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

  304.             if(ret < 0){

  305.                 err = -1;

  306.                 goto fail;

  307.             }

  308.         }else{

  309.             int g3d1 = (compr == TIFF_G3) && !(opts & 1);

  310.             if(compr!=TIFF_CCITT_RLE && has_eol && find_group3_syncmarker(&gb, srcsize*8) < 0)

  311.                 break;

  312.             if(compr==TIFF_CCITT_RLE || g3d1 || get_bits1(&gb))

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

  314.             else

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

  316.             if(compr==TIFF_CCITT_RLE)

  317.                 align_get_bits(&gb);

  318.         }

  319.         if(ret < 0){

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

  321.         }else{

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

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

  324.         }

  325.         dst += stride;

  326.     }

  327. fail:

  328.     av_free(runs);

  329.     av_free(ref);

  330.     return err;

  331. }