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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 "libavutil/thread.h"

  28. #include "avcodec.h"

  29. #include "get_bits.h"

  30. #include "put_bits.h"

  31. #include "faxcompr.h"

  32. 

  33. #define CCITT_SYMS 104

  34. 

  35. static const uint16_t ccitt_syms[CCITT_SYMS] = {

  36.     0,    1,    2,    3,    4,    5,    6,    7,    8,    9,   10,   11,   12,

  37.    13,   14,   15,   16,   17,   18,   19,   20,   21,   22,   23,   24,   25,

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

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

  40.    52,   53,   54,   55,   56,   57,   58,   59,   60,   61,   62,   63,   64,

  41.   128,  192,  256,  320,  384,  448,  512,  576,  640,  704,  768,  832,  896,

  42.   960, 1024, 1088, 1152, 1216, 1280, 1344, 1408, 1472, 1536, 1600, 1664, 1728,

  43.  1792, 1856, 1920, 1984, 2048, 2112, 2176, 2240, 2304, 2368, 2432, 2496, 2560

  44. };

  45. 

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

  47. {

  48.   {

  49.     0x35, 0x07, 0x07, 0x08, 0x0B, 0x0C, 0x0E, 0x0F, 0x13, 0x14, 0x07, 0x08, 0x08,

  50.     0x03, 0x34, 0x35, 0x2A, 0x2B, 0x27, 0x0C, 0x08, 0x17, 0x03, 0x04, 0x28, 0x2B,

  51.     0x13, 0x24, 0x18, 0x02, 0x03, 0x1A, 0x1B, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,

  52.     0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x04, 0x05, 0x0A, 0x0B, 0x52, 0x53, 0x54,

  53.     0x55, 0x24, 0x25, 0x58, 0x59, 0x5A, 0x5B, 0x4A, 0x4B, 0x32, 0x33, 0x34, 0x1B,

  54.     0x12, 0x17, 0x37, 0x36, 0x37, 0x64, 0x65, 0x68, 0x67, 0xCC, 0xCD, 0xD2, 0xD3,

  55.     0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0x98, 0x99, 0x9A, 0x18, 0x9B,

  56.     0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F

  57.   },

  58.   {

  59.     0x37, 0x02, 0x03, 0x02, 0x03, 0x03, 0x02, 0x03, 0x05, 0x04, 0x04, 0x05, 0x07,

  60.     0x04, 0x07, 0x18, 0x17, 0x18, 0x08, 0x67, 0x68, 0x6C, 0x37, 0x28, 0x17, 0x18,

  61.     0xCA, 0xCB, 0xCC, 0xCD, 0x68, 0x69, 0x6A, 0x6B, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6,

  62.     0xD7, 0x6C, 0x6D, 0xDA, 0xDB, 0x54, 0x55, 0x56, 0x57, 0x64, 0x65, 0x52, 0x53,

  63.     0x24, 0x37, 0x38, 0x27, 0x28, 0x58, 0x59, 0x2B, 0x2C, 0x5A, 0x66, 0x67, 0x0F,

  64.     0xC8, 0xC9, 0x5B, 0x33, 0x34, 0x35, 0x6C, 0x6D, 0x4A, 0x4B, 0x4C, 0x4D, 0x72,

  65.     0x73, 0x74, 0x75, 0x76, 0x77, 0x52, 0x53, 0x54, 0x55, 0x5A, 0x5B, 0x64, 0x65,

  66.     0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F

  67.   }

  68. };

  69. 

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

  71. {

  72.   {

  73.      8,  6,  4,  4,  4,  4,  4,  4,  5,  5,  5,  5,  6,  6,  6,  6,  6,  6,  7,  7,

  74.      7,  7,  7,  7,  7,  7,  7,  7,  7,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,

  75.      8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,

  76.      8,  8,  8,  8,  5,  5,  6,  7,  8,  8,  8,  8,  8,  8,  9,  9,  9,  9,  9,  9,

  77.      9,  9,  9,  9,  9,  9,  9,  9,  9,  6,  9, 11, 11, 11, 12, 12, 12, 12, 12, 12,

  78.     12, 12, 12, 12

  79.   },

  80.   {

  81.     10,  3,  2,  2,  3,  4,  4,  5,  6,  6,  7,  7,  7,  8,  8,  9, 10, 10, 10, 11,

  82.     11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,

  83.     12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,

  84.     12, 12, 12, 12, 10, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13,

  85.     13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 11, 11, 11, 12, 12, 12, 12, 12, 12,

  86.     12, 12, 12, 12

  87.   }

  88. };

  89. 

  90. static const uint8_t ccitt_group3_2d_bits[11] = {

  91.     1, 1, 2, 2, 2, 1, 3, 3, 3, 1, 1

  92. };

  93. 

  94. static const uint8_t ccitt_group3_2d_lens[11] = {

  95.     4, 3, 7, 6, 3, 1, 3, 6, 7, 7, 9

  96. };

  97. 

  98. static VLC ccitt_vlc[2], ccitt_group3_2d_vlc;

  99. 

  100. static av_cold void ccitt_unpack_init(void)

  101. {

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

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

  104.     int i;

  105. 

  106.     ccitt_vlc[0].table = code_table1;

  107.     ccitt_vlc[0].table_allocated = 528;

  108.     ccitt_vlc[1].table = code_table2;

  109.     ccitt_vlc[1].table_allocated = 648;

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

  111.         ff_init_vlc_sparse(&ccitt_vlc[i], 9, CCITT_SYMS,

  112.                            ccitt_codes_lens[i], 1, 1,

  113.                            ccitt_codes_bits[i], 1, 1,

  114.                            ccitt_syms, 2, 2,

  115.                            INIT_VLC_USE_NEW_STATIC);

  116.     }

  117.     INIT_VLC_STATIC(&ccitt_group3_2d_vlc, 9, 11,

  118.                     ccitt_group3_2d_lens, 1, 1,

  119.                     ccitt_group3_2d_bits, 1, 1, 512);

  120. }

  121. 

  122. av_cold void ff_ccitt_unpack_init(void)

  123. {

  124.     static AVOnce init_static_once = AV_ONCE_INIT;

  125.     ff_thread_once(&init_static_once, ccitt_unpack_init);

  126. }

  127. 

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

  129.                                unsigned int *pix_left, int **runs,

  130.                                const int *runend, int *mode)

  131. {

  132.     int eob = 0;

  133.     int newmode;

  134.     int saved_run = 0;

  135. 

  136.     do {

  137.         int cwi, k;

  138.         int cw = 0;

  139.         int codes[2];

  140.         do {

  141.             cwi = show_bits(gb, 11);

  142.             if (!cwi) {

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

  144.                 return AVERROR_INVALIDDATA;

  145.             }

  146.             cwi = 10 - av_log2(cwi);

  147.             skip_bits(gb, cwi + 1);

  148.             if (cwi > 5) {

  149.                 newmode = get_bits1(gb);

  150.                 eob = 1;

  151.                 cwi -= 6;

  152.             }

  153.             cw += cwi;

  154.         } while(cwi == 5);

  155. 

  156.         codes[0] = cw;

  157.         codes[1] = !eob;

  158. 

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

  160.             if (codes[k]) {

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

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

  163.                     if (*runs >= runend) {

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

  165.                         return AVERROR_INVALIDDATA;

  166.                     }

  167.                     if (*pix_left <= saved_run) {

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

  169.                         return AVERROR_INVALIDDATA;

  170.                     }

  171.                     *pix_left -= saved_run;

  172.                     saved_run = 0;

  173.                     *mode = !*mode;

  174.                 }

  175.                 saved_run += codes[k];

  176.             }

  177.         }

  178.     } while (!eob);

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

  180.     if (*runs >= runend) {

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

  182.         return AVERROR_INVALIDDATA;

  183.     }

  184.     if (*pix_left <= saved_run) {

  185.         if (*pix_left == saved_run)

  186.             return 1;

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

  188.         return AVERROR_INVALIDDATA;

  189.     }

  190.     *pix_left -= saved_run;

  191.     saved_run = 0;

  192.     *mode = !*mode;

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

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

  195.         if (*runs >= runend) {

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

  197.             return AVERROR_INVALIDDATA;

  198.         }

  199.         *mode = newmode;

  200.     }

  201.     return 0;

  202. }

  203. 

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

  205.                                  unsigned int pix_left, int *runs,

  206.                                  const int *runend)

  207. {

  208.     int mode         = 0;

  209.     unsigned int run = 0;

  210.     unsigned int t;

  211.     for (;;) {

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

  213.         run += t;

  214.         if (t < 64) {

  215.             *runs++ = run;

  216.             if (runs >= runend) {

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

  218.                 return AVERROR_INVALIDDATA;

  219.             }

  220.             if (pix_left <= run) {

  221.                 if (pix_left == run)

  222.                     break;

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

  224.                 return AVERROR_INVALIDDATA;

  225.             }

  226.             pix_left -= run;

  227.             run       = 0;

  228.             mode      = !mode;

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

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

  231.                 int ret;

  232.                 skip_bits(gb, 12);

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

  234.                 if (ret < 0) {

  235.                     return ret;

  236.                 } else if (ret)

  237.                     break;

  238.             } else {

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

  240.                 return AVERROR_INVALIDDATA;

  241.             }

  242.         }

  243.     }

  244.     *runs++ = 0;

  245.     return 0;

  246. }

  247. 

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

  249.                                  unsigned int width, int *runs,

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

  251. {

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

  253.     int run_off       = *ref++;

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

  255. 

  256.     while (offs < width) {

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

  258.         if (cmode == -1) {

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

  260.             return AVERROR_INVALIDDATA;

  261.         }

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

  263.             if (run_off < width)

  264.                 run_off += *ref++;

  265.             run      = run_off - offs;

  266.             offs     = run_off;

  267.             if (run_off < width)

  268.                 run_off += *ref++;

  269.             if (offs > width) {

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

  271.                 return AVERROR_INVALIDDATA;

  272.             }

  273.             saved_run += run;

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

  275.             int k;

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

  277.                 run = 0;

  278.                 for (;;) {

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

  280.                     if (t == -1) {

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

  282.                         return AVERROR_INVALIDDATA;

  283.                     }

  284.                     run += t;

  285.                     if (t < 64)

  286.                         break;

  287.                 }

  288.                 *runs++ = run + saved_run;

  289.                 if (runs >= runend) {

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

  291.                     return AVERROR_INVALIDDATA;

  292.                 }

  293.                 saved_run = 0;

  294.                 offs     += run;

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

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

  297.                     return AVERROR_INVALIDDATA;

  298.                 }

  299.                 mode = !mode;

  300.             }

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

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

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

  304.                 int ret;

  305.                 int pix_left = width - offs;

  306. 

  307.                 if (saved_run) {

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

  309.                     return AVERROR_INVALIDDATA;

  310.                 }

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

  312.                 offs = width - pix_left;

  313.                 if (ret < 0) {

  314.                     return ret;

  315.                 } else if (ret)

  316.                     break;

  317.             } else {

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

  319.                 return AVERROR_PATCHWELCOME;

  320.             }

  321.         } else { //vertical mode

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

  323.             run_off -= *--ref;

  324.             offs    += run;

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

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

  327.                 return AVERROR_INVALIDDATA;

  328.             }

  329.             *runs++ = run + saved_run;

  330.             if (runs >= runend) {

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

  332.                 return AVERROR_INVALIDDATA;

  333.             }

  334.             saved_run = 0;

  335.             mode      = !mode;

  336.         }

  337.         //sync line pointers

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

  339.             run_off += *ref++;

  340.             run_off += *ref++;

  341.         }

  342.     }

  343.     *runs++ = saved_run;

  344.     if (saved_run) {

  345.         if (runs >= runend) {

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

  347.             return -1;

  348.         }

  349.         *runs++ = 0;

  350.     }

  351.     return 0;

  352. }

  353. 

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

  355. {

  356.     PutBitContext pb;

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

  358. 

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

  360.     while (pix_left > 0) {

  361.         run       = runs[run_idx++];

  362.         mode      = ~mode;

  363.         pix_left -= run;

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

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

  366.         if (run)

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

  368.     }

  369.     flush_put_bits(&pb);

  370. }

  371. 

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

  373. {

  374.     unsigned int state = -1;

  375.     srcsize -= get_bits_count(gb);

  376.     while (srcsize-- > 0) {

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

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

  379.             return 0;

  380.     }

  381.     return -1;

  382. }

  383. 

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

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

  386.                     enum TiffCompr compr, int opts)

  387. {

  388.     int j;

  389.     GetBitContext gb;

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

  391.     int ret;

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

  393.     int has_eol;

  394. 

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

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

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

  398.         ret = AVERROR(ENOMEM);

  399.         goto fail;

  400.     }

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

  402.     ref[1] = 0;

  403.     ref[2] = 0;

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

  405.         goto fail;

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

  407. 

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

  409.         runend = runs + runsize;

  410.         if (compr == TIFF_G4) {

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

  412.                                         ref);

  413.             if (ret < 0)

  414.                 goto fail;

  415.         } else {

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

  417.             if (compr != TIFF_CCITT_RLE &&

  418.                 has_eol &&

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

  420.                 break;

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

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

  423.                                             runend);

  424.             else

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

  426.                                             runend, ref);

  427.             if (compr == TIFF_CCITT_RLE)

  428.                 align_get_bits(&gb);

  429.         }

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

  431.             goto fail;

  432. 

  433.         if (ret < 0) {

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

  435.         } else {

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

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

  438.         }

  439.         dst += stride;

  440.     }

  441.     ret = 0;

  442. fail:

  443.     av_free(runs);

  444.     av_free(ref);

  445.     return ret;

  446. }