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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. static int decode_uncompressed(AVCodecContext *avctx, GetBitContext *gb,

  126.                                unsigned int *pix_left, int **runs,

  127.                                const int *runend, int *mode)

  128. {

  129.     int eob = 0;

  130.     int newmode;

  131.     int saved_run = 0;

  132. 

  133.     do {

  134.         int cwi, k;

  135.         int cw = 0;

  136.         int codes[2];

  137.         do {

  138.             cwi = show_bits(gb, 11);

  139.             if (!cwi) {

  140.                 av_log(avctx, AV_LOG_ERROR, "Invalid uncompressed codeword\n");

  141.                 return AVERROR_INVALIDDATA;

  142.             }

  143.             cwi = 10 - av_log2(cwi);

  144.             skip_bits(gb, cwi + 1);

  145.             if (cwi > 5) {

  146.                 newmode = get_bits1(gb);

  147.                 eob = 1;

  148.                 cwi -= 6;

  149.             }

  150.             cw += cwi;

  151.         } while(cwi == 5);

  152. 

  153.         codes[0] = cw;

  154.         codes[1] = !eob;

  155. 

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

  157.             if (codes[k]) {

  158.                 if (*mode == !k) {

  159.                     *(*runs)++ = saved_run;

  160.                     if (*runs >= runend) {

  161.                         av_log(avctx, AV_LOG_ERROR, "uncompressed run overrun\n");

  162.                         return AVERROR_INVALIDDATA;

  163.                     }

  164.                     if (*pix_left <= saved_run) {

  165.                         av_log(avctx, AV_LOG_ERROR, "uncompressed run went out of bounds\n");

  166.                         return AVERROR_INVALIDDATA;

  167.                     }

  168.                     *pix_left -= saved_run;

  169.                     saved_run = 0;

  170.                     *mode = !*mode;

  171.                 }

  172.                 saved_run += codes[k];

  173.             }

  174.         }

  175.     } while (!eob);

  176.     *(*runs)++ = saved_run;

  177.     if (*runs >= runend) {

  178.         av_log(avctx, AV_LOG_ERROR, "uncompressed run overrun\n");

  179.         return AVERROR_INVALIDDATA;

  180.     }

  181.     if (*pix_left <= saved_run) {

  182.         if (*pix_left == saved_run)

  183.             return 1;

  184.         av_log(avctx, AV_LOG_ERROR, "uncompressed run went out of boundsE\n");

  185.         return AVERROR_INVALIDDATA;

  186.     }

  187.     *pix_left -= saved_run;

  188.     saved_run = 0;

  189.     *mode = !*mode;

  190.     if (newmode != *mode) { //FIXME CHECK

  191.         *(*runs)++ = 0;

  192.         *mode = newmode;

  193.     }

  194.     return 0;

  195. }

  196. 

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

  198.                                  unsigned int pix_left, int *runs,

  199.                                  const int *runend)

  200. {

  201.     int mode         = 0;

  202.     unsigned int run = 0;

  203.     unsigned int t;

  204.     for (;;) {

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

  206.         run += t;

  207.         if (t < 64) {

  208.             *runs++ = run;

  209.             if (runs >= runend) {

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

  211.                 return AVERROR_INVALIDDATA;

  212.             }

  213.             if (pix_left <= run) {

  214.                 if (pix_left == run)

  215.                     break;

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

  217.                 return AVERROR_INVALIDDATA;

  218.             }

  219.             pix_left -= run;

  220.             run       = 0;

  221.             mode      = !mode;

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

  223.             if (show_bits(gb, 12) == 15) {

  224.                 int ret;

  225.                 skip_bits(gb, 12);

  226.                 ret = decode_uncompressed(avctx, gb, &pix_left, &runs, runend, &mode);

  227.                 if (ret < 0) {

  228.                     return ret;

  229.                 } else if (ret)

  230.                     break;

  231.             } else {

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

  233.                 return AVERROR_INVALIDDATA;

  234.             }

  235.         }

  236.     }

  237.     *runs++ = 0;

  238.     return 0;

  239. }

  240. 

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

  242.                                  unsigned int width, int *runs,

  243.                                  const int *runend, const int *ref)

  244. {

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

  246.     int run_off       = *ref++;

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

  248. 

  249.     while (offs < width) {

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

  251.         if (cmode == -1) {

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

  253.             return AVERROR_INVALIDDATA;

  254.         }

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

  256.             if (run_off < width)

  257.                 run_off += *ref++;

  258.             run      = run_off - offs;

  259.             offs     = run_off;

  260.             if (run_off < width)

  261.                 run_off += *ref++;

  262.             if (offs > width) {

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

  264.                 return AVERROR_INVALIDDATA;

  265.             }

  266.             saved_run += run;

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

  268.             int k;

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

  270.                 run = 0;

  271.                 for (;;) {

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

  273.                     if (t == -1) {

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

  275.                         return AVERROR_INVALIDDATA;

  276.                     }

  277.                     run += t;

  278.                     if (t < 64)

  279.                         break;

  280.                 }

  281.                 *runs++ = run + saved_run;

  282.                 if (runs >= runend) {

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

  284.                     return AVERROR_INVALIDDATA;

  285.                 }

  286.                 saved_run = 0;

  287.                 offs     += run;

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

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

  290.                     return AVERROR_INVALIDDATA;

  291.                 }

  292.                 mode = !mode;

  293.             }

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

  295.             int xxx = get_bits(gb, 3);

  296.             if (cmode == 9 && xxx == 7) {

  297.                 int ret;

  298.                 int pix_left = width - offs;

  299. 

  300.                 if (saved_run) {

  301.                     av_log(avctx, AV_LOG_ERROR, "saved run %d on entering uncompressed mode\n", saved_run);

  302.                     return AVERROR_INVALIDDATA;

  303.                 }

  304.                 ret = decode_uncompressed(avctx, gb, &pix_left, &runs, runend, &mode);

  305.                 offs = width - pix_left;

  306.                 if (ret < 0) {

  307.                     return ret;

  308.                 } else if (ret)

  309.                     break;

  310.             } else {

  311.                 avpriv_report_missing_feature(avctx, "Special mode %d xxx=%d support", cmode, xxx);

  312.                 return AVERROR_PATCHWELCOME;

  313.             }

  314.         } else { //vertical mode

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

  316.             run_off -= *--ref;

  317.             offs    += run;

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

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

  320.                 return AVERROR_INVALIDDATA;

  321.             }

  322.             *runs++ = run + saved_run;

  323.             if (runs >= runend) {

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

  325.                 return AVERROR_INVALIDDATA;

  326.             }

  327.             saved_run = 0;

  328.             mode      = !mode;

  329.         }

  330.         //sync line pointers

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

  332.             run_off += *ref++;

  333.             run_off += *ref++;

  334.         }

  335.     }

  336.     *runs++ = saved_run;

  337.     if (saved_run) {

  338.         if (runs >= runend) {

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

  340.             return -1;

  341.         }

  342.         *runs++ = 0;

  343.     }

  344.     return 0;

  345. }

  346. 

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

  348. {

  349.     PutBitContext pb;

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

  351. 

  352.     init_put_bits(&pb, dst, size);

  353.     while (pix_left > 0) {

  354.         run       = runs[run_idx++];

  355.         mode      = ~mode;

  356.         pix_left -= run;

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

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

  359.         if (run)

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

  361.     }

  362.     flush_put_bits(&pb);

  363. }

  364. 

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

  366. {

  367.     unsigned int state = -1;

  368.     srcsize -= get_bits_count(gb);

  369.     while (srcsize-- > 0) {

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

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

  372.             return 0;

  373.     }

  374.     return -1;

  375. }

  376. 

  377. int ff_ccitt_unpack(AVCodecContext *avctx, const uint8_t *src, int srcsize,

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

  379.                     enum TiffCompr compr, int opts)

  380. {

  381.     int j;

  382.     GetBitContext gb;

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

  384.     int ret;

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

  386.     int has_eol;

  387. 

  388.     runs = av_malloc_array(runsize, sizeof(runs[0]));

  389.     ref  = av_malloc_array(runsize, sizeof(ref[0]));

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

  391.         ret = AVERROR(ENOMEM);

  392.         goto fail;

  393.     }

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

  395.     ref[1] = 0;

  396.     ref[2] = 0;

  397.     if ((ret = init_get_bits8(&gb, src, srcsize)) < 0)

  398.         goto fail;

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

  400. 

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

  402.         runend = runs + runsize;

  403.         if (compr == TIFF_G4) {

  404.             ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend,

  405.                                         ref);

  406.             if (ret < 0)

  407.                 goto fail;

  408.         } else {

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

  410.             if (compr != TIFF_CCITT_RLE &&

  411.                 has_eol &&

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

  413.                 break;

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

  415.                 ret = decode_group3_1d_line(avctx, &gb, avctx->width, runs,

  416.                                             runend);

  417.             else

  418.                 ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs,

  419.                                             runend, ref);

  420.             if (compr == TIFF_CCITT_RLE)

  421.                 align_get_bits(&gb);

  422.         }

  423.         if (avctx->err_recognition & AV_EF_EXPLODE && ret < 0)

  424.             goto fail;

  425. 

  426.         if (ret < 0) {

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

  428.         } else {

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

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

  431.         }

  432.         dst += stride;

  433.     }

  434.     ret = 0;

  435. fail:

  436.     av_free(runs);

  437.     av_free(ref);

  438.     return ret;

  439. }