2 * CCITT Fax Group 3 and 4 decompression
3 * Copyright (c) 2008 Konstantin Shishkov
5 * This file is part of FFmpeg.
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.
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.
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
23 * CCITT Fax Group 3 and 4 decompression
25 * @author Konstantin Shishkov
28 #include "bitstream.h"
31 #define CCITT_SYMS 104
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
44 static const uint8_t ccitt_codes_bits[2][CCITT_SYMS] =
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
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
68 static const uint8_t ccitt_codes_lens[2][CCITT_SYMS] =
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,
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,
88 static const uint8_t ccitt_group3_2d_bits[11] = {
89 1, 1, 2, 2, 2, 1, 3, 3, 3, 1, 1
92 static const uint8_t ccitt_group3_2d_lens[11] = {
93 4, 3, 7, 6, 3, 1, 3, 6, 7, 7, 9
96 static VLC ccitt_vlc[2], ccitt_group3_2d_vlc;
98 av_cold void ff_ccitt_unpack_init()
100 static VLC_TYPE code_table1[528][2];
101 static VLC_TYPE code_table2[648][2];
103 static int initialized = 0;
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,
116 INIT_VLC_USE_NEW_STATIC);
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);
125 static int decode_group3_1d_line(AVCodecContext *avctx, GetBitContext *gb,
126 int pix_left, int *runs, const int *runend)
128 int mode = 0, run = 0;
131 t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);
137 av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
143 runs[-1] += pix_left;
144 av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
149 }else if((int)t == -1){
150 av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");
158 static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb,
159 int pix_left, int *runs, const int *runend, const int *ref)
161 int mode = 0, offs = 0, run = 0, saved_run = 0, t;
162 int run_off = *ref++;
163 int *run_start = runs;
165 runend--; // for the last written 0
168 int cmode = get_vlc2(gb, ccitt_group3_2d_vlc.table, 9, 1);
170 av_log(avctx, AV_LOG_ERROR, "Incorrect mode VLC\n");
174 if(runs != run_start)while(run_off <= offs && run_off < avctx->width){
178 if(!cmode){//pass mode
180 run = run_off - offs;
184 av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
189 }else if(cmode == 1){//horizontal mode
191 for(k = 0; k < 2; k++){
194 t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);
196 av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");
203 *runs++ = run + saved_run;
205 av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
211 av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
217 }else if(cmode == 9 || cmode == 10){
218 av_log(avctx, AV_LOG_ERROR, "Special modes are not supported (yet)\n");
220 }else{//vertical mode
221 run = run_off - offs + (cmode - 5);
228 av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
232 *runs++ = run + saved_run;
234 av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
246 static void put_line(uint8_t *dst, int size, int width, const int *runs)
249 int run, mode = ~0, pix_left = width, run_idx = 0;
251 init_put_bits(&pb, dst, size*8);
253 run = runs[run_idx++];
256 for(; run > 16; run -= 16)
257 put_sbits(&pb, 16, mode);
259 put_sbits(&pb, run, mode);
263 static int find_group3_syncmarker(GetBitContext *gb, int srcsize)
265 unsigned int state = -1;
266 srcsize -= get_bits_count(gb);
267 while(srcsize-- > 0){
268 state+= state + get_bits1(gb);
269 if((state & 0xFFF) == 1)
275 int ff_ccitt_unpack(AVCodecContext *avctx,
276 const uint8_t *src, int srcsize,
277 uint8_t *dst, int height, int stride, enum TiffCompr compr)
281 int *runs, *ref, *runend;
284 runs = av_malloc((avctx->width + 2) * sizeof(runs[0]));
285 ref = av_malloc((avctx->width + 2) * sizeof(ref[0]));
286 ref[0] = avctx->width;
289 init_get_bits(&gb, src, srcsize*8);
290 for(j = 0; j < height; j++){
291 runend = runs + avctx->width + 2;
292 if(compr == TIFF_G4){
293 ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend, ref);
300 if(find_group3_syncmarker(&gb, srcsize*8) < 0)
302 if(compr==TIFF_CCITT_RLE || get_bits1(&gb))
303 ret = decode_group3_1d_line(avctx, &gb, avctx->width, runs, runend);
305 ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend, ref);
308 put_line(dst, stride, avctx->width, ref);
310 put_line(dst, stride, avctx->width, runs);
311 FFSWAP(int*, runs, ref);