0853ed4af6d91555a45291e39af3ec0c86e729d1
[libav.git] / libavcodec / faxcompr.c
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 int pix_left, int *runs)
127 {
128 int mode = 0, run = 0;
129 unsigned int t;
130 for(;;){
131 t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);
132 run += t;
133 if(t < 64){
134 pix_left -= run;
135 *runs++ = run;
136 if(pix_left <= 0){
137 if(!pix_left)
138 break;
139 runs[-1] = 0;
140 av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
141 return -1;
142 }
143 run = 0;
144 mode = !mode;
145 }else if((int)t == -1){
146 av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");
147 return -1;
148 }
149 }
150 *runs++ = 0;
151 return 0;
152 }
153
154 static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb,
155 int pix_left, int *runs, const int *ref)
156 {
157 int mode = 0, offs = 0, run = 0, saved_run = 0, t;
158 int run_off = *ref++;
159 int *run_start = runs;
160
161 while(pix_left > 0){
162 int cmode = get_vlc2(gb, ccitt_group3_2d_vlc.table, 9, 1);
163 if(cmode == -1){
164 av_log(avctx, AV_LOG_ERROR, "Incorrect mode VLC\n");
165 return -1;
166 }
167 //sync line pointers
168 if(runs != run_start)while(run_off <= offs && run_off < avctx->width){
169 run_off += *ref++;
170 run_off += *ref++;
171 }
172 if(!cmode){//pass mode
173 run_off += *ref++;
174 run = run_off - offs;
175 run_off += *ref++;
176 pix_left -= run;
177 if(pix_left < 0){
178 av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
179 return -1;
180 }
181 offs += run;
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 saved_run = 0;
199 if(pix_left < run){
200 av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
201 return -1;
202 }
203 pix_left -= run;
204 offs += run;
205 mode = !mode;
206 }
207 }else if(cmode == 9 || cmode == 10){
208 av_log(avctx, AV_LOG_ERROR, "Special modes are not supported (yet)\n");
209 return -1;
210 }else{//vertical mode
211 run = run_off - offs + (cmode - 5);
212 if(cmode >= 5)
213 run_off += *ref++;
214 else
215 run_off -= *--ref;
216 pix_left -= run;
217 if(pix_left < 0){
218 av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
219 return -1;
220 }
221 offs += run;
222 *runs++ = run + saved_run;
223 saved_run = 0;
224 mode = !mode;
225 }
226 }
227 *runs++ = saved_run;
228 *runs++ = 0;
229 return 0;
230 }
231
232 static void put_line(uint8_t *dst, int size, int width, const int *runs)
233 {
234 PutBitContext pb;
235 int run, mode = ~0, pix_left = width, run_idx = 0;
236
237 init_put_bits(&pb, dst, size*8);
238 while(pix_left > 0){
239 run = runs[run_idx++];
240 mode = ~mode;
241 pix_left -= run;
242 for(; run > 16; run -= 16)
243 put_sbits(&pb, 16, mode);
244 if(run)
245 put_sbits(&pb, run, mode);
246 }
247 }
248
249 static int find_group3_syncmarker(GetBitContext *gb, int srcsize)
250 {
251 unsigned int state = -1;
252 srcsize -= get_bits_count(gb);
253 while(srcsize-- > 0){
254 state+= state + get_bits1(gb);
255 if((state & 0xFFF) == 1)
256 return 0;
257 }
258 return -1;
259 }
260
261 int ff_ccitt_unpack_1d(AVCodecContext *avctx,
262 const uint8_t *src, int srcsize,
263 uint8_t *dst, int height, int stride)
264 {
265 int j;
266 GetBitContext gb;
267 int *runs, *last;
268
269 runs = av_malloc(avctx->width * sizeof(runs[0]));
270 last = av_malloc(avctx->width * sizeof(last[0]));
271 init_get_bits(&gb, src, srcsize*8);
272 for(j = 0; j < height; j++){
273 if(find_group3_syncmarker(&gb, srcsize*8) < 0)
274 break;
275 if(decode_group3_1d_line(avctx, &gb, avctx->width, runs) < 0){
276 put_line(dst, stride, avctx->width, last);
277 }else{
278 put_line(dst, stride, avctx->width, runs);
279 FFSWAP(int*, last, runs);
280 }
281 dst += stride;
282 }
283 av_free(runs);
284 av_free(last);
285 return 0;
286 }
287
288 int ff_ccitt_unpack_2d(AVCodecContext *avctx,
289 const uint8_t *src, int srcsize,
290 uint8_t *dst, int height, int stride, int g4)
291 {
292 int j;
293 GetBitContext gb;
294 int *runs, *ref;
295 int ret;
296
297 runs = av_malloc((avctx->width + 2) * sizeof(runs[0]));
298 ref = av_malloc((avctx->width + 2) * sizeof(ref[0]));
299 ref[0] = avctx->width;
300 ref[1] = 0;
301 ref[2] = 0;
302 init_get_bits(&gb, src, srcsize*8);
303 for(j = 0; j < height; j++){
304 if(g4){
305 ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, ref);
306 if(ret < 0){
307 av_free(runs);
308 av_free(ref);
309 return -1;
310 }
311 }else{
312 if(find_group3_syncmarker(&gb, srcsize*8) < 0)
313 break;
314 if(get_bits1(&gb))
315 ret = decode_group3_1d_line(avctx, &gb, avctx->width, runs);
316 else
317 ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, ref);
318 }
319 if(ret < 0){
320 put_line(dst, stride, avctx->width, ref);
321 }else{
322 put_line(dst, stride, avctx->width, runs);
323 FFSWAP(int*, runs, ref);
324 }
325 dst += stride;
326 }
327 av_free(runs);
328 av_free(ref);
329 return 0;
330 }