Statistics
| Branch: | Revision:

ffmpeg / libavcodec / faxcompr.c @ a56f82ea

History | View | Annotate | Download (10.6 KB)

1
/*
2
 * CCITT Fax Group 3 and 4 decompression
3
 * Copyright (c) 2008 Konstantin Shishkov
4
 *
5
 * This file is part of FFmpeg.
6
 *
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.
11
 *
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.
16
 *
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
20
 */
21

    
22
/**
23
 * CCITT Fax Group 3 and 4 decompression
24
 * @file faxcompr.c
25
 * @author Konstantin Shishkov
26
 */
27
#include "avcodec.h"
28
#include "bitstream.h"
29
#include "faxcompr.h"
30

    
31
#define CCITT_SYMS 104
32

    
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
42
};
43

    
44
static const uint8_t ccitt_codes_bits[2][CCITT_SYMS] =
45
{
46
  {
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
55
  },
56
  {
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
65
  }
66
};
67

    
68
static const uint8_t ccitt_codes_lens[2][CCITT_SYMS] =
69
{
70
  {
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,
76
    12, 12, 12, 12
77
  },
78
  {
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,
84
    12, 12, 12, 12
85
  }
86
};
87

    
88
static const uint8_t ccitt_group3_2d_bits[11] = {
89
    1, 1, 2, 2, 2, 1, 3, 3, 3, 1, 1
90
};
91

    
92
static const uint8_t ccitt_group3_2d_lens[11] = {
93
    4, 3, 7, 6, 3, 1, 3, 6, 7, 7, 9
94
};
95

    
96
static VLC ccitt_vlc[2], ccitt_group3_2d_vlc;
97

    
98
av_cold void ff_ccitt_unpack_init()
99
{
100
    static VLC_TYPE code_table1[528][2];
101
    static VLC_TYPE code_table2[648][2];
102
    int i;
103
    static int initialized = 0;
104

    
105
    if(initialized)
106
        return;
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,
115
                        ccitt_syms, 2, 2,
116
                        INIT_VLC_USE_NEW_STATIC);
117
    }
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);
121
    initialized = 1;
122
}
123

    
124

    
125
static int decode_group3_1d_line(AVCodecContext *avctx, GetBitContext *gb,
126
                                 unsigned int pix_left, int *runs, const int *runend)
127
{
128
    int mode = 0;
129
    unsigned int run=0;
130
    unsigned int t;
131
    for(;;){
132
        t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);
133
        run += t;
134
        if(t < 64){
135
            *runs++ = run;
136
            if(runs >= runend){
137
                av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
138
                return -1;
139
            }
140
            if(pix_left <= run){
141
                if(pix_left == run)
142
                    break;
143
                av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
144
                return -1;
145
            }
146
            pix_left -= run;
147
            run = 0;
148
            mode = !mode;
149
        }else if((int)t == -1){
150
            av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");
151
            return -1;
152
        }
153
    }
154
    *runs++ = 0;
155
    return 0;
156
}
157

    
158
static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb,
159
                                 unsigned int width, int *runs, const int *runend, const int *ref)
160
{
161
    int mode = 0, saved_run = 0, t;
162
    int run_off = *ref++;
163
    unsigned int offs=0, run= 0;
164

    
165
    runend--; // for the last written 0
166

    
167
    while(offs < width){
168
        int cmode = get_vlc2(gb, ccitt_group3_2d_vlc.table, 9, 1);
169
        if(cmode == -1){
170
            av_log(avctx, AV_LOG_ERROR, "Incorrect mode VLC\n");
171
            return -1;
172
        }
173
        if(!cmode){//pass mode
174
            run_off += *ref++;
175
            run = run_off - offs;
176
            offs= run_off;
177
            run_off += *ref++;
178
            if(offs > width){
179
                av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
180
                return -1;
181
            }
182
            saved_run += run;
183
        }else if(cmode == 1){//horizontal mode
184
            int k;
185
            for(k = 0; k < 2; k++){
186
                run = 0;
187
                for(;;){
188
                    t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);
189
                    if(t == -1){
190
                        av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");
191
                        return -1;
192
                    }
193
                    run += t;
194
                    if(t < 64)
195
                        break;
196
                }
197
                *runs++ = run + saved_run;
198
                if(runs >= runend){
199
                    av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
200
                    return -1;
201
                }
202
                saved_run = 0;
203
                offs += run;
204
                if(offs > width || run > width){
205
                    av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
206
                    return -1;
207
                }
208
                mode = !mode;
209
            }
210
        }else if(cmode == 9 || cmode == 10){
211
            av_log(avctx, AV_LOG_ERROR, "Special modes are not supported (yet)\n");
212
            return -1;
213
        }else{//vertical mode
214
            run = run_off - offs + (cmode - 5);
215
            run_off -= *--ref;
216
            offs += run;
217
            if(offs > width || run > width){
218
                av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
219
                return -1;
220
            }
221
            *runs++ = run + saved_run;
222
            if(runs >= runend){
223
                av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
224
                return -1;
225
            }
226
            saved_run = 0;
227
            mode = !mode;
228
        }
229
        //sync line pointers
230
        while(run_off <= offs){
231
            run_off += *ref++;
232
            run_off += *ref++;
233
        }
234
    }
235
    *runs++ = saved_run;
236
    *runs++ = 0;
237
    return 0;
238
}
239

    
240
static void put_line(uint8_t *dst, int size, int width, const int *runs)
241
{
242
    PutBitContext pb;
243
    int run, mode = ~0, pix_left = width, run_idx = 0;
244

    
245
    init_put_bits(&pb, dst, size*8);
246
    while(pix_left > 0){
247
        run = runs[run_idx++];
248
        mode = ~mode;
249
        pix_left -= run;
250
        for(; run > 16; run -= 16)
251
            put_sbits(&pb, 16, mode);
252
        if(run)
253
            put_sbits(&pb, run, mode);
254
    }
255
}
256

    
257
static int find_group3_syncmarker(GetBitContext *gb, int srcsize)
258
{
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)
264
            return 0;
265
    }
266
    return -1;
267
}
268

    
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)
272
{
273
    int j;
274
    GetBitContext gb;
275
    int *runs, *ref, *runend;
276
    int ret;
277
    int runsize= avctx->width + 2;
278

    
279
    runs = av_malloc(runsize * sizeof(runs[0]));
280
    ref  = av_malloc(runsize * sizeof(ref[0]));
281
    ref[0] = avctx->width;
282
    ref[1] = 0;
283
    ref[2] = 0;
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);
289
            if(ret < 0){
290
                av_free(runs);
291
                av_free(ref);
292
                return -1;
293
            }
294
        }else{
295
            if(find_group3_syncmarker(&gb, srcsize*8) < 0)
296
                break;
297
            if(compr==TIFF_CCITT_RLE || get_bits1(&gb))
298
                ret = decode_group3_1d_line(avctx, &gb, avctx->width, runs, runend);
299
            else
300
                ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend, ref);
301
        }
302
        if(ret < 0){
303
            put_line(dst, stride, avctx->width, ref);
304
        }else{
305
            put_line(dst, stride, avctx->width, runs);
306
            FFSWAP(int*, runs, ref);
307
        }
308
        dst += stride;
309
    }
310
    av_free(runs);
311
    av_free(ref);
312
    return 0;
313
}