/* * CCITT Fax Group 3 and 4 decompression * Copyright (c) 2008 Konstantin Shishkov * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * CCITT Fax Group 3 and 4 decompression * @file faxcompr.c * @author Konstantin Shishkov */ #include "avcodec.h" #include "bitstream.h" #include "faxcompr.h" #define CCITT_SYMS 104 static const uint16_t ccitt_syms[CCITT_SYMS] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 128, 192, 256, 320, 384, 448, 512, 576, 640, 704, 768, 832, 896, 960, 1024, 1088, 1152, 1216, 1280, 1344, 1408, 1472, 1536, 1600, 1664, 1728, 1792, 1856, 1920, 1984, 2048, 2112, 2176, 2240, 2304, 2368, 2432, 2496, 2560 }; static const uint8_t ccitt_codes_bits[2][CCITT_SYMS] = { { 0x35, 0x07, 0x07, 0x08, 0x0B, 0x0C, 0x0E, 0x0F, 0x13, 0x14, 0x07, 0x08, 0x08, 0x03, 0x34, 0x35, 0x2A, 0x2B, 0x27, 0x0C, 0x08, 0x17, 0x03, 0x04, 0x28, 0x2B, 0x13, 0x24, 0x18, 0x02, 0x03, 0x1A, 0x1B, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x04, 0x05, 0x0A, 0x0B, 0x52, 0x53, 0x54, 0x55, 0x24, 0x25, 0x58, 0x59, 0x5A, 0x5B, 0x4A, 0x4B, 0x32, 0x33, 0x34, 0x1B, 0x12, 0x17, 0x37, 0x36, 0x37, 0x64, 0x65, 0x68, 0x67, 0xCC, 0xCD, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0x98, 0x99, 0x9A, 0x18, 0x9B, 0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F }, { 0x37, 0x02, 0x03, 0x02, 0x03, 0x03, 0x02, 0x03, 0x05, 0x04, 0x04, 0x05, 0x07, 0x04, 0x07, 0x18, 0x17, 0x18, 0x08, 0x67, 0x68, 0x6C, 0x37, 0x28, 0x17, 0x18, 0xCA, 0xCB, 0xCC, 0xCD, 0x68, 0x69, 0x6A, 0x6B, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0x6C, 0x6D, 0xDA, 0xDB, 0x54, 0x55, 0x56, 0x57, 0x64, 0x65, 0x52, 0x53, 0x24, 0x37, 0x38, 0x27, 0x28, 0x58, 0x59, 0x2B, 0x2C, 0x5A, 0x66, 0x67, 0x0F, 0xC8, 0xC9, 0x5B, 0x33, 0x34, 0x35, 0x6C, 0x6D, 0x4A, 0x4B, 0x4C, 0x4D, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x52, 0x53, 0x54, 0x55, 0x5A, 0x5B, 0x64, 0x65, 0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F } }; static const uint8_t ccitt_codes_lens[2][CCITT_SYMS] = { { 8, 6, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 5, 5, 6, 7, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 6, 9, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12 }, { 10, 3, 2, 2, 3, 4, 4, 5, 6, 6, 7, 7, 7, 8, 8, 9, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 10, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12 } }; static const uint8_t ccitt_group3_2d_bits[11] = { 1, 1, 2, 2, 2, 1, 3, 3, 3, 1, 1 }; static const uint8_t ccitt_group3_2d_lens[11] = { 4, 3, 7, 6, 3, 1, 3, 6, 7, 7, 9 }; static VLC ccitt_vlc[2], ccitt_group3_2d_vlc; av_cold void ff_ccitt_unpack_init() { static VLC_TYPE code_table1[528][2]; static VLC_TYPE code_table2[648][2]; int i; static int initialized = 0; if(initialized) return; ccitt_vlc[0].table = code_table1; ccitt_vlc[0].table_allocated = 528; ccitt_vlc[1].table = code_table2; ccitt_vlc[1].table_allocated = 648; for(i = 0; i < 2; i++){ init_vlc_sparse(&ccitt_vlc[i], 9, CCITT_SYMS, ccitt_codes_lens[i], 1, 1, ccitt_codes_bits[i], 1, 1, ccitt_syms, 2, 2, INIT_VLC_USE_NEW_STATIC); } INIT_VLC_STATIC(&ccitt_group3_2d_vlc, 9, 11, ccitt_group3_2d_lens, 1, 1, ccitt_group3_2d_bits, 1, 1, 512); initialized = 1; } static int decode_group3_1d_line(AVCodecContext *avctx, GetBitContext *gb, int pix_left, int *runs) { int mode = 0, run = 0; unsigned int t; for(;;){ t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2); run += t; if(t < 64){ pix_left -= run; *runs++ = run; if(pix_left <= 0){ if(!pix_left) break; runs[-1] += pix_left; av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n"); return -1; } run = 0; mode = !mode; }else if((int)t == -1){ av_log(avctx, AV_LOG_ERROR, "Incorrect code\n"); return -1; } } *runs++ = 0; return 0; } static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb, int pix_left, int *runs, const int *ref) { int mode = 0, offs = 0, run = 0, saved_run = 0, t; int run_off = *ref++; int *run_start = runs; while(pix_left > 0){ int cmode = get_vlc2(gb, ccitt_group3_2d_vlc.table, 9, 1); if(cmode == -1){ av_log(avctx, AV_LOG_ERROR, "Incorrect mode VLC\n"); return -1; } //sync line pointers if(runs != run_start)while(run_off <= offs && run_off < avctx->width){ run_off += *ref++; run_off += *ref++; } if(!cmode){//pass mode run_off += *ref++; run = run_off - offs; run_off += *ref++; pix_left -= run; if(pix_left < 0){ av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n"); return -1; } offs += run; saved_run += run; }else if(cmode == 1){//horizontal mode int k; for(k = 0; k < 2; k++){ run = 0; for(;;){ t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2); if(t == -1){ av_log(avctx, AV_LOG_ERROR, "Incorrect code\n"); return -1; } run += t; if(t < 64) break; } *runs++ = run + saved_run; saved_run = 0; if(pix_left < run){ av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n"); return -1; } pix_left -= run; offs += run; mode = !mode; } }else if(cmode == 9 || cmode == 10){ av_log(avctx, AV_LOG_ERROR, "Special modes are not supported (yet)\n"); return -1; }else{//vertical mode run = run_off - offs + (cmode - 5); if(cmode >= 5) run_off += *ref++; else run_off -= *--ref; pix_left -= run; if(pix_left < 0){ av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n"); return -1; } offs += run; *runs++ = run + saved_run; saved_run = 0; mode = !mode; } } *runs++ = saved_run; *runs++ = 0; return 0; } static void put_line(uint8_t *dst, int size, int width, const int *runs) { PutBitContext pb; int run, mode = ~0, pix_left = width, run_idx = 0; init_put_bits(&pb, dst, size*8); while(pix_left > 0){ run = runs[run_idx++]; mode = ~mode; pix_left -= run; for(; run > 16; run -= 16) put_sbits(&pb, 16, mode); if(run) put_sbits(&pb, run, mode); } } static int find_group3_syncmarker(GetBitContext *gb, int srcsize) { unsigned int state = -1; srcsize -= get_bits_count(gb); while(srcsize-- > 0){ state+= state + get_bits1(gb); if((state & 0xFFF) == 1) return 0; } return -1; } int ff_ccitt_unpack(AVCodecContext *avctx, const uint8_t *src, int srcsize, uint8_t *dst, int height, int stride, enum TiffCompr compr) { int j; GetBitContext gb; int *runs, *ref; int ret; runs = av_malloc((avctx->width + 2) * sizeof(runs[0])); ref = av_malloc((avctx->width + 2) * sizeof(ref[0])); ref[0] = avctx->width; ref[1] = 0; ref[2] = 0; init_get_bits(&gb, src, srcsize*8); for(j = 0; j < height; j++){ if(compr == TIFF_G4){ ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, ref); if(ret < 0){ av_free(runs); av_free(ref); return -1; } }else{ if(find_group3_syncmarker(&gb, srcsize*8) < 0) break; if(compr==TIFF_CCITT_RLE || get_bits1(&gb)) ret = decode_group3_1d_line(avctx, &gb, avctx->width, runs); else ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, ref); } if(ret < 0){ put_line(dst, stride, avctx->width, ref); }else{ put_line(dst, stride, avctx->width, runs); FFSWAP(int*, runs, ref); } dst += stride; } av_free(runs); av_free(ref); return 0; }