libavcodec/faxcompr.c

   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] = 0;
 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         if(!run){
 241             mode = !mode;
 242             continue;
 243         }
 244         pix_left -= run;
 245         for(; run > 16; run -= 16)
 246             put_sbits(&pb, 16, -mode);
 247         put_sbits(&pb, run, -mode);
 248         mode = !mode;
 249     }
 250 }
 251
 252 static int find_group3_syncmarker(GetBitContext *gb, int srcsize)
 253 {
 254     int state = get_bits(gb, 12);
 255     int rem = srcsize - get_bits_count(gb);
 256     while((state & 0xFFF) != 1){
 257         state = (state << 1) | get_bits1(gb);
 258         if(--rem <= 0)
 259             return -1;
 260     }
 261     return 0;
 262 }
 263
 264 int ff_ccitt_unpack_1d(AVCodecContext *avctx,
 265                        const uint8_t *src, int srcsize,
 266                        uint8_t *dst, int height, int stride)
 267 {
 268     int j;
 269     GetBitContext gb;
 270     int *runs, *last;
 271
 272     runs = av_malloc(avctx->width * sizeof(runs[0]));
 273     last = av_malloc(avctx->width * sizeof(last[0]));
 274     init_get_bits(&gb, src, srcsize*8);
 275     for(j = 0; j < height; j++){
 276         if(find_group3_syncmarker(&gb, srcsize*8) < 0)
 277             break;
 278         if(decode_group3_1d_line(avctx, &gb, avctx->width, runs) < 0){
 279             put_line(dst, stride, avctx->width, last);
 280         }else{
 281             put_line(dst, stride, avctx->width, runs);
 282             FFSWAP(int*, last, runs);
 283         }
 284         dst += stride;
 285     }
 286     av_free(runs);
 287     av_free(last);
 288     return 0;
 289 }
 290
 291 int ff_ccitt_unpack_2d(AVCodecContext *avctx,
 292                        const uint8_t *src, int srcsize,
 293                        uint8_t *dst, int height, int stride, int g4)
 294 {
 295     int j;
 296     GetBitContext gb;
 297     int *runs, *ref;
 298     int ret;
 299
 300     runs = av_malloc((avctx->width + 2) * sizeof(runs[0]));
 301     ref  = av_malloc((avctx->width + 2) * sizeof(ref[0]));
 302     ref[0] = avctx->width;
 303     ref[1] = 0;
 304     ref[2] = 0;
 305     init_get_bits(&gb, src, srcsize*8);
 306     for(j = 0; j < height; j++){
 307         if(g4){
 308             ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, ref);
 309             if(ret < 0){
 310                 av_free(runs);
 311                 av_free(ref);
 312                 return -1;
 313             }
 314         }else{
 315             if(find_group3_syncmarker(&gb, srcsize*8) < 0)
 316                 break;
 317             if(get_bits1(&gb))
 318                 ret = decode_group3_1d_line(avctx, &gb, avctx->width, runs);
 319             else
 320                 ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, ref);
 321         }
 322         if(ret < 0){
 323             put_line(dst, stride, avctx->width, ref);
 324         }else{
 325             put_line(dst, stride, avctx->width, runs);
 326             FFSWAP(int*, runs, ref);
 327         }
 328         dst += stride;
 329     }
 330     av_free(runs);
 331     av_free(ref);
 332     return 0;
 333 }