| /* |
| * 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 libavcodec/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(void) |
| { |
| 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, |
| unsigned int pix_left, int *runs, const int *runend) |
| { |
| int mode = 0; |
| unsigned int run=0; |
| unsigned int t; |
| for(;;){ |
| t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2); |
| run += t; |
| if(t < 64){ |
| *runs++ = run; |
| if(runs >= runend){ |
| av_log(avctx, AV_LOG_ERROR, "Run overrun\n"); |
| return -1; |
| } |
| if(pix_left <= run){ |
| if(pix_left == run) |
| break; |
| av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n"); |
| return -1; |
| } |
| pix_left -= run; |
| 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, |
| unsigned int width, int *runs, const int *runend, const int *ref) |
| { |
| int mode = 0, saved_run = 0, t; |
| int run_off = *ref++; |
| unsigned int offs=0, run= 0; |
| |
| runend--; // for the last written 0 |
| |
| while(offs < width){ |
| 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; |
| } |
| if(!cmode){//pass mode |
| run_off += *ref++; |
| run = run_off - offs; |
| offs= run_off; |
| run_off += *ref++; |
| if(offs > width){ |
| av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n"); |
| return -1; |
| } |
| 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; |
| if(runs >= runend){ |
| av_log(avctx, AV_LOG_ERROR, "Run overrun\n"); |
| return -1; |
| } |
| saved_run = 0; |
| offs += run; |
| if(offs > width || run > width){ |
| av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n"); |
| return -1; |
| } |
| 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); |
| run_off -= *--ref; |
| offs += run; |
| if(offs > width || run > width){ |
| av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n"); |
| return -1; |
| } |
| *runs++ = run + saved_run; |
| if(runs >= runend){ |
| av_log(avctx, AV_LOG_ERROR, "Run overrun\n"); |
| return -1; |
| } |
| saved_run = 0; |
| mode = !mode; |
| } |
| //sync line pointers |
| while(run_off <= offs){ |
| run_off += *ref++; |
| run_off += *ref++; |
| } |
| } |
| *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, *runend; |
| int ret; |
| int runsize= avctx->width + 2; |
| |
| runs = av_malloc(runsize * sizeof(runs[0])); |
| ref = av_malloc(runsize * 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++){ |
| runend = runs + runsize; |
| if(compr == TIFF_G4){ |
| ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend, 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, runend); |
| else |
| ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend, 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; |
| } |
