ffmpeg / libavcodec / faxcompr.c @ b2755007
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/*
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* CCITT Fax Group 3 and 4 decompression
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* Copyright (c) 2008 Konstantin Shishkov
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* CCITT Fax Group 3 and 4 decompression
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* @file libavcodec/faxcompr.c
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* @author Konstantin Shishkov
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*/
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#include "avcodec.h" |
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#include "bitstream.h" |
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#include "put_bits.h" |
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#include "faxcompr.h" |
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#define CCITT_SYMS 104 |
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static const uint16_t ccitt_syms[CCITT_SYMS] = { |
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, |
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13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, |
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26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, |
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39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, |
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52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, |
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128, 192, 256, 320, 384, 448, 512, 576, 640, 704, 768, 832, 896, |
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960, 1024, 1088, 1152, 1216, 1280, 1344, 1408, 1472, 1536, 1600, 1664, 1728, |
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1792, 1856, 1920, 1984, 2048, 2112, 2176, 2240, 2304, 2368, 2432, 2496, 2560 |
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}; |
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static const uint8_t ccitt_codes_bits[2][CCITT_SYMS] = |
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{
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{
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0x35, 0x07, 0x07, 0x08, 0x0B, 0x0C, 0x0E, 0x0F, 0x13, 0x14, 0x07, 0x08, 0x08, |
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0x03, 0x34, 0x35, 0x2A, 0x2B, 0x27, 0x0C, 0x08, 0x17, 0x03, 0x04, 0x28, 0x2B, |
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0x13, 0x24, 0x18, 0x02, 0x03, 0x1A, 0x1B, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, |
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0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x04, 0x05, 0x0A, 0x0B, 0x52, 0x53, 0x54, |
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0x55, 0x24, 0x25, 0x58, 0x59, 0x5A, 0x5B, 0x4A, 0x4B, 0x32, 0x33, 0x34, 0x1B, |
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0x12, 0x17, 0x37, 0x36, 0x37, 0x64, 0x65, 0x68, 0x67, 0xCC, 0xCD, 0xD2, 0xD3, |
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0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0x98, 0x99, 0x9A, 0x18, 0x9B, |
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0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F |
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}, |
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{
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0x37, 0x02, 0x03, 0x02, 0x03, 0x03, 0x02, 0x03, 0x05, 0x04, 0x04, 0x05, 0x07, |
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0x04, 0x07, 0x18, 0x17, 0x18, 0x08, 0x67, 0x68, 0x6C, 0x37, 0x28, 0x17, 0x18, |
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0xCA, 0xCB, 0xCC, 0xCD, 0x68, 0x69, 0x6A, 0x6B, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, |
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0xD7, 0x6C, 0x6D, 0xDA, 0xDB, 0x54, 0x55, 0x56, 0x57, 0x64, 0x65, 0x52, 0x53, |
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0x24, 0x37, 0x38, 0x27, 0x28, 0x58, 0x59, 0x2B, 0x2C, 0x5A, 0x66, 0x67, 0x0F, |
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0xC8, 0xC9, 0x5B, 0x33, 0x34, 0x35, 0x6C, 0x6D, 0x4A, 0x4B, 0x4C, 0x4D, 0x72, |
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0x73, 0x74, 0x75, 0x76, 0x77, 0x52, 0x53, 0x54, 0x55, 0x5A, 0x5B, 0x64, 0x65, |
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0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F |
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} |
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}; |
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static const uint8_t ccitt_codes_lens[2][CCITT_SYMS] = |
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{
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{
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8, 6, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7, |
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7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, |
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8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, |
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8, 8, 8, 8, 5, 5, 6, 7, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, |
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9, 9, 9, 9, 9, 9, 9, 9, 9, 6, 9, 11, 11, 11, 12, 12, 12, 12, 12, 12, |
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12, 12, 12, 12 |
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}, |
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{
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10, 3, 2, 2, 3, 4, 4, 5, 6, 6, 7, 7, 7, 8, 8, 9, 10, 10, 10, 11, |
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11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, |
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12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, |
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12, 12, 12, 12, 10, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13, |
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13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 11, 11, 11, 12, 12, 12, 12, 12, 12, |
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12, 12, 12, 12 |
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} |
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}; |
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static const uint8_t ccitt_group3_2d_bits[11] = { |
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1, 1, 2, 2, 2, 1, 3, 3, 3, 1, 1 |
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}; |
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static const uint8_t ccitt_group3_2d_lens[11] = { |
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4, 3, 7, 6, 3, 1, 3, 6, 7, 7, 9 |
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}; |
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static VLC ccitt_vlc[2], ccitt_group3_2d_vlc; |
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av_cold void ff_ccitt_unpack_init(void) |
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{
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static VLC_TYPE code_table1[528][2]; |
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static VLC_TYPE code_table2[648][2]; |
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int i;
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static int initialized = 0; |
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if(initialized)
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return;
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ccitt_vlc[0].table = code_table1;
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ccitt_vlc[0].table_allocated = 528; |
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ccitt_vlc[1].table = code_table2;
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ccitt_vlc[1].table_allocated = 648; |
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for(i = 0; i < 2; i++){ |
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init_vlc_sparse(&ccitt_vlc[i], 9, CCITT_SYMS,
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ccitt_codes_lens[i], 1, 1, |
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ccitt_codes_bits[i], 1, 1, |
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ccitt_syms, 2, 2, |
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INIT_VLC_USE_NEW_STATIC); |
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} |
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INIT_VLC_STATIC(&ccitt_group3_2d_vlc, 9, 11, |
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ccitt_group3_2d_lens, 1, 1, |
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ccitt_group3_2d_bits, 1, 1, 512); |
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initialized = 1;
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} |
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static int decode_group3_1d_line(AVCodecContext *avctx, GetBitContext *gb, |
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unsigned int pix_left, int *runs, const int *runend) |
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{
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int mode = 0; |
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unsigned int run=0; |
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unsigned int t; |
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for(;;){
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t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2); |
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run += t; |
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if(t < 64){ |
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*runs++ = run; |
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if(runs >= runend){
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av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
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return -1; |
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} |
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if(pix_left <= run){
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if(pix_left == run)
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break;
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av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
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return -1; |
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} |
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pix_left -= run; |
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run = 0;
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mode = !mode; |
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}else if((int)t == -1){ |
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av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");
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return -1; |
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} |
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} |
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*runs++ = 0;
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return 0; |
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} |
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static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb, |
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unsigned int width, int *runs, const int *runend, const int *ref) |
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{
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int mode = 0, saved_run = 0, t; |
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int run_off = *ref++;
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unsigned int offs=0, run= 0; |
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runend--; // for the last written 0
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while(offs < width){
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int cmode = get_vlc2(gb, ccitt_group3_2d_vlc.table, 9, 1); |
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if(cmode == -1){ |
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av_log(avctx, AV_LOG_ERROR, "Incorrect mode VLC\n");
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return -1; |
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} |
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if(!cmode){//pass mode |
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run_off += *ref++; |
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run = run_off - offs; |
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offs= run_off; |
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run_off += *ref++; |
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if(offs > width){
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av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
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return -1; |
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} |
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saved_run += run; |
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}else if(cmode == 1){//horizontal mode |
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int k;
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for(k = 0; k < 2; k++){ |
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run = 0;
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for(;;){
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t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2); |
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if(t == -1){ |
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av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");
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return -1; |
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} |
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run += t; |
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if(t < 64) |
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break;
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} |
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*runs++ = run + saved_run; |
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if(runs >= runend){
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av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
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return -1; |
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} |
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saved_run = 0;
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offs += run; |
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if(offs > width || run > width){
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av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
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return -1; |
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} |
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mode = !mode; |
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} |
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}else if(cmode == 9 || cmode == 10){ |
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av_log(avctx, AV_LOG_ERROR, "Special modes are not supported (yet)\n");
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return -1; |
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}else{//vertical mode |
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run = run_off - offs + (cmode - 5);
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run_off -= *--ref; |
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offs += run; |
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if(offs > width || run > width){
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av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
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return -1; |
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} |
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*runs++ = run + saved_run; |
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if(runs >= runend){
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av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
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return -1; |
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} |
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saved_run = 0;
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mode = !mode; |
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} |
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//sync line pointers
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while(run_off <= offs){
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run_off += *ref++; |
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run_off += *ref++; |
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} |
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} |
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*runs++ = saved_run; |
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*runs++ = 0;
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return 0; |
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} |
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static void put_line(uint8_t *dst, int size, int width, const int *runs) |
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{
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PutBitContext pb; |
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int run, mode = ~0, pix_left = width, run_idx = 0; |
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init_put_bits(&pb, dst, size*8);
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while(pix_left > 0){ |
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run = runs[run_idx++]; |
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mode = ~mode; |
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pix_left -= run; |
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for(; run > 16; run -= 16) |
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put_sbits(&pb, 16, mode);
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if(run)
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put_sbits(&pb, run, mode); |
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} |
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} |
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static int find_group3_syncmarker(GetBitContext *gb, int srcsize) |
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{
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unsigned int state = -1; |
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srcsize -= get_bits_count(gb); |
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while(srcsize-- > 0){ |
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state+= state + get_bits1(gb); |
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if((state & 0xFFF) == 1) |
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return 0; |
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} |
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return -1; |
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} |
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|
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int ff_ccitt_unpack(AVCodecContext *avctx,
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const uint8_t *src, int srcsize, |
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uint8_t *dst, int height, int stride, enum TiffCompr compr) |
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{
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int j;
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GetBitContext gb; |
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int *runs, *ref, *runend;
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int ret;
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int runsize= avctx->width + 2; |
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runs = av_malloc(runsize * sizeof(runs[0])); |
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ref = av_malloc(runsize * sizeof(ref[0])); |
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ref[0] = avctx->width;
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ref[1] = 0; |
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ref[2] = 0; |
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init_get_bits(&gb, src, srcsize*8);
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for(j = 0; j < height; j++){ |
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runend = runs + runsize; |
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if(compr == TIFF_G4){
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ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend, ref); |
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if(ret < 0){ |
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av_free(runs); |
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av_free(ref); |
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return -1; |
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} |
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}else{
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if(find_group3_syncmarker(&gb, srcsize*8) < 0) |
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break;
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if(compr==TIFF_CCITT_RLE || get_bits1(&gb))
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ret = decode_group3_1d_line(avctx, &gb, avctx->width, runs, runend); |
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else
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ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend, ref); |
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} |
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if(ret < 0){ |
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put_line(dst, stride, avctx->width, ref); |
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}else{
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put_line(dst, stride, avctx->width, runs); |
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FFSWAP(int*, runs, ref);
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} |
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dst += stride; |
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} |
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av_free(runs); |
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av_free(ref); |
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return 0; |
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} |