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
24 * @file libavcodec/faxcompr.c
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(void)
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 unsigned int pix_left, int *runs, const int *runend)
132 t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);
137 av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
143 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 unsigned int width, int *runs, const int *runend, const int *ref)
161 int mode = 0, saved_run = 0, t;
162 int run_off = *ref++;
163 unsigned int offs=0, run= 0;
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");
173 if(!cmode){//pass mode
175 run = run_off - offs;
179 av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
183 }else if(cmode == 1){//horizontal mode
185 for(k = 0; k < 2; k++){
188 t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);
190 av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");
197 *runs++ = run + saved_run;
199 av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
204 if(offs > width || run > width){
205 av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
210 }else if(cmode == 9 || cmode == 10){
211 av_log(avctx, AV_LOG_ERROR, "Special modes are not supported (yet)\n");
213 }else{//vertical mode
214 run = run_off - offs + (cmode - 5);
217 if(offs > width || run > width){
218 av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
221 *runs++ = run + saved_run;
223 av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
230 while(run_off <= offs){
240 static void put_line(uint8_t *dst, int size, int width, const int *runs)
243 int run, mode = ~0, pix_left = width, run_idx = 0;
245 init_put_bits(&pb, dst, size*8);
247 run = runs[run_idx++];
250 for(; run > 16; run -= 16)
251 put_sbits(&pb, 16, mode);
253 put_sbits(&pb, run, mode);
257 static int find_group3_syncmarker(GetBitContext *gb, int srcsize)
259 unsigned int state = -1;
260 srcsize -= get_bits_count(gb);
261 while(srcsize-- > 0){
262 state+= state + get_bits1(gb);
263 if((state & 0xFFF) == 1)
269 int ff_ccitt_unpack(AVCodecContext *avctx,
270 const uint8_t *src, int srcsize,
271 uint8_t *dst, int height, int stride, enum TiffCompr compr)
275 int *runs, *ref, *runend;
277 int runsize= avctx->width + 2;
279 runs = av_malloc(runsize * sizeof(runs[0]));
280 ref = av_malloc(runsize * sizeof(ref[0]));
281 ref[0] = avctx->width;
284 init_get_bits(&gb, src, srcsize*8);
285 for(j = 0; j < height; j++){
286 runend = runs + runsize;
287 if(compr == TIFF_G4){
288 ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend, ref);
295 if(find_group3_syncmarker(&gb, srcsize*8) < 0)
297 if(compr==TIFF_CCITT_RLE || get_bits1(&gb))
298 ret = decode_group3_1d_line(avctx, &gb, avctx->width, runs, runend);
300 ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend, ref);
303 put_line(dst, stride, avctx->width, ref);
305 put_line(dst, stride, avctx->width, runs);
306 FFSWAP(int*, runs, ref);