FFmpeg: libavcodec/faxcompr.c Source File

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libavcodec

faxcompr.c

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1 /*

2 * CCITT Fax Group 3 and 4 decompression

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 */

22 /**

23 * @file

24 * CCITT Fax Group 3 and 4 decompression

25 * @author Konstantin Shishkov

26 */

27 #include "avcodec.h"

28 #include "get_bits.h"

29 #include "put_bits.h"

30 #include "faxcompr.h"

32 #define CCITT_SYMS 104

34 static const uint16_t ccitt_syms[CCITT_SYMS] = {

35 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,

36 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,

37 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38,

38 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,

39 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64,

40 128, 192, 256, 320, 384, 448, 512, 576, 640, 704, 768, 832, 896,

41 960, 1024, 1088, 1152, 1216, 1280, 1344, 1408, 1472, 1536, 1600, 1664, 1728,

42 1792, 1856, 1920, 1984, 2048, 2112, 2176, 2240, 2304, 2368, 2432, 2496, 2560

43 };

45 static const uint8_t ccitt_codes_bits[2][CCITT_SYMS] =

46 {

47 {

48 0x35, 0x07, 0x07, 0x08, 0x0B, 0x0C, 0x0E, 0x0F, 0x13, 0x14, 0x07, 0x08, 0x08,

49 0x03, 0x34, 0x35, 0x2A, 0x2B, 0x27, 0x0C, 0x08, 0x17, 0x03, 0x04, 0x28, 0x2B,

50 0x13, 0x24, 0x18, 0x02, 0x03, 0x1A, 0x1B, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,

51 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x04, 0x05, 0x0A, 0x0B, 0x52, 0x53, 0x54,

52 0x55, 0x24, 0x25, 0x58, 0x59, 0x5A, 0x5B, 0x4A, 0x4B, 0x32, 0x33, 0x34, 0x1B,

53 0x12, 0x17, 0x37, 0x36, 0x37, 0x64, 0x65, 0x68, 0x67, 0xCC, 0xCD, 0xD2, 0xD3,

54 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0x98, 0x99, 0x9A, 0x18, 0x9B,

55 0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F

56 },

57 {

58 0x37, 0x02, 0x03, 0x02, 0x03, 0x03, 0x02, 0x03, 0x05, 0x04, 0x04, 0x05, 0x07,

59 0x04, 0x07, 0x18, 0x17, 0x18, 0x08, 0x67, 0x68, 0x6C, 0x37, 0x28, 0x17, 0x18,

60 0xCA, 0xCB, 0xCC, 0xCD, 0x68, 0x69, 0x6A, 0x6B, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6,

61 0xD7, 0x6C, 0x6D, 0xDA, 0xDB, 0x54, 0x55, 0x56, 0x57, 0x64, 0x65, 0x52, 0x53,

62 0x24, 0x37, 0x38, 0x27, 0x28, 0x58, 0x59, 0x2B, 0x2C, 0x5A, 0x66, 0x67, 0x0F,

63 0xC8, 0xC9, 0x5B, 0x33, 0x34, 0x35, 0x6C, 0x6D, 0x4A, 0x4B, 0x4C, 0x4D, 0x72,

64 0x73, 0x74, 0x75, 0x76, 0x77, 0x52, 0x53, 0x54, 0x55, 0x5A, 0x5B, 0x64, 0x65,

65 0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F

66 }

67 };

69 static const uint8_t ccitt_codes_lens[2][CCITT_SYMS] =

70 {

71 {

72 8, 6, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7,

73 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

74 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

75 8, 8, 8, 8, 5, 5, 6, 7, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9,

76 9, 9, 9, 9, 9, 9, 9, 9, 9, 6, 9, 11, 11, 11, 12, 12, 12, 12, 12, 12,

77 12, 12, 12, 12

78 },

79 {

80 10, 3, 2, 2, 3, 4, 4, 5, 6, 6, 7, 7, 7, 8, 8, 9, 10, 10, 10, 11,

81 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,

82 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,

83 12, 12, 12, 12, 10, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13,

84 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 11, 11, 11, 12, 12, 12, 12, 12, 12,

85 12, 12, 12, 12

86 }

87 };

89 static const uint8_t ccitt_group3_2d_bits[11] = {

90 1, 1, 2, 2, 2, 1, 3, 3, 3, 1, 1

91 };

93 static const uint8_t ccitt_group3_2d_lens[11] = {

94 4, 3, 7, 6, 3, 1, 3, 6, 7, 7, 9

95 };

97 static VLC ccitt_vlc[2], ccitt_group3_2d_vlc;

99 av_cold void ff_ccitt_unpack_init(void)

100 {

101 static VLC_TYPE code_table1[528][2];

102 static VLC_TYPE code_table2[648][2];

103 int i;

104 static int initialized = 0;

105

106 if (initialized)

107 return;

108 ccitt_vlc[0].table = code_table1;

109 ccitt_vlc[0].table_allocated = 528;

110 ccitt_vlc[1].table = code_table2;

111 ccitt_vlc[1].table_allocated = 648;

112 for (i = 0; i < 2; i++) {

113 ff_init_vlc_sparse(&ccitt_vlc[i], 9, CCITT_SYMS,

114 ccitt_codes_lens[i], 1, 1,

115 ccitt_codes_bits[i], 1, 1,

116 ccitt_syms, 2, 2,

117 INIT_VLC_USE_NEW_STATIC);

118 }

119 INIT_VLC_STATIC(&ccitt_group3_2d_vlc, 9, 11,

120 ccitt_group3_2d_lens, 1, 1,

121 ccitt_group3_2d_bits, 1, 1, 512);

122 initialized = 1;

123 }

124

125

126 static int decode_group3_1d_line(AVCodecContext *avctx, GetBitContext *gb,

127 unsigned int pix_left, int *runs,

128 const int *runend)

129 {

130 int mode = 0;

131 unsigned int run = 0;

132 unsigned int t;

133 for (;;) {

134 t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);

135 run += t;

136 if (t < 64) {

137 *runs++ = run;

138 if (runs >= runend) {

139 av_log(avctx, AV_LOG_ERROR, "Run overrun\n");

140 return AVERROR_INVALIDDATA;

141 }

142 if (pix_left <= run) {

143 if (pix_left == run)

144 break;

145 av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");

146 return AVERROR_INVALIDDATA;

147 }

148 pix_left -= run;

149 run = 0;

150 mode = !mode;

151 } else if ((int)t == -1) {

152 av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");

153 return AVERROR_INVALIDDATA;

154 }

155 }

156 *runs++ = 0;

157 return 0;

158 }

159

160 static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb,

161 unsigned int width, int *runs,

162 const int *runend, const int *ref)

163 {

164 int mode = 0, saved_run = 0, t;

165 int run_off = *ref++;

166 unsigned int offs = 0, run = 0;

167

168 while (offs < width) {

169 int cmode = get_vlc2(gb, ccitt_group3_2d_vlc.table, 9, 1);

170 if (cmode == -1) {

171 av_log(avctx, AV_LOG_ERROR, "Incorrect mode VLC\n");

172 return AVERROR_INVALIDDATA;

173 }

174 if (!cmode) { //pass mode

175 if (run_off < width)

176 run_off += *ref++;

177 run = run_off - offs;

178 offs = run_off;

179 if (run_off < width)

180 run_off += *ref++;

181 if (offs > width) {

182 av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");

183 return AVERROR_INVALIDDATA;

184 }

185 saved_run += run;

186 } else if (cmode == 1) { //horizontal mode

187 int k;

188 for (k = 0; k < 2; k++) {

189 run = 0;

190 for (;;) {

191 t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);

192 if (t == -1) {

193 av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");

194 return AVERROR_INVALIDDATA;

195 }

196 run += t;

197 if (t < 64)

198 break;

199 }

200 *runs++ = run + saved_run;

201 if (runs >= runend) {

202 av_log(avctx, AV_LOG_ERROR, "Run overrun\n");

203 return AVERROR_INVALIDDATA;

204 }

205 saved_run = 0;

206 offs += run;

207 if (offs > width || run > width) {

208 av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");

209 return AVERROR_INVALIDDATA;

210 }

211 mode = !mode;

212 }

213 } else if (cmode == 9 || cmode == 10) {

214 avpriv_report_missing_feature(avctx, "Special modes support");

215 return AVERROR_PATCHWELCOME;

216 } else { //vertical mode

217 run = run_off - offs + (cmode - 5);

218 run_off -= *--ref;

219 offs += run;

220 if (offs > width || run > width) {

221 av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");

222 return AVERROR_INVALIDDATA;

223 }

224 *runs++ = run + saved_run;

225 if (runs >= runend) {

226 av_log(avctx, AV_LOG_ERROR, "Run overrun\n");

227 return AVERROR_INVALIDDATA;

228 }

229 saved_run = 0;

230 mode = !mode;

231 }

232 //sync line pointers

233 while (offs < width && run_off <= offs) {

234 run_off += *ref++;

235 run_off += *ref++;

236 }

237 }

238 *runs++ = saved_run;

239 if (saved_run) {

240 if (runs >= runend) {

241 av_log(avctx, AV_LOG_ERROR, "Run overrun\n");

242 return -1;

243 }

244 *runs++ = 0;

245 }

246 return 0;

247 }

248

249 static void put_line(uint8_t *dst, int size, int width, const int *runs)

250 {

251 PutBitContext pb;

252 int run, mode = ~0, pix_left = width, run_idx = 0;

253

254 init_put_bits(&pb, dst, size * 8);

255 while (pix_left > 0) {

256 run = runs[run_idx++];

257 mode = ~mode;

258 pix_left -= run;

259 for (; run > 16; run -= 16)

260 put_sbits(&pb, 16, mode);

261 if (run)

262 put_sbits(&pb, run, mode);

263 }

264 flush_put_bits(&pb);

265 }

266

267 static int find_group3_syncmarker(GetBitContext *gb, int srcsize)

268 {

269 unsigned int state = -1;

270 srcsize -= get_bits_count(gb);

271 while (srcsize-- > 0) {

272 state += state + get_bits1(gb);

273 if ((state & 0xFFF) == 1)

274 return 0;

275 }

276 return -1;

277 }

278

279 int ff_ccitt_unpack(AVCodecContext *avctx, const uint8_t *src, int srcsize,

280 uint8_t *dst, int height, int stride,

281 enum TiffCompr compr, int opts)

282 {

283 int j;

284 GetBitContext gb;

285 int *runs, *ref = NULL, *runend;

286 int ret;

287 int runsize = avctx->width + 2;

288 int has_eol;

289

290 runs = av_malloc(runsize * sizeof(runs[0]));

291 ref = av_malloc(runsize * sizeof(ref[0]));

292 if (!runs || !ref) {

293 ret = AVERROR(ENOMEM);

294 goto fail;

295 }

296 ref[0] = avctx->width;

297 ref[1] = 0;

298 ref[2] = 0;

299 init_get_bits(&gb, src, srcsize * 8);

300 has_eol = show_bits(&gb, 12) == 1 || show_bits(&gb, 16) == 1;

301

302 for (j = 0; j < height; j++) {

303 runend = runs + runsize;

304 if (compr == TIFF_G4) {

305 ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend,

306 ref);

307 if (ret < 0)

308 goto fail;

309 } else {

310 int g3d1 = (compr == TIFF_G3) && !(opts & 1);

311 if (compr != TIFF_CCITT_RLE &&

312 has_eol &&

313 find_group3_syncmarker(&gb, srcsize * 8) < 0)

314 break;

315 if (compr == TIFF_CCITT_RLE || g3d1 || get_bits1(&gb))

316 ret = decode_group3_1d_line(avctx, &gb, avctx->width, runs,

317 runend);

318 else

319 ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs,

320 runend, ref);

321 if (compr == TIFF_CCITT_RLE)

322 align_get_bits(&gb);

323 }

324 if (avctx->err_recognition & AV_EF_EXPLODE && ret < 0)

325 goto fail;

326

327 if (ret < 0) {

328 put_line(dst, stride, avctx->width, ref);

329 } else {

330 put_line(dst, stride, avctx->width, runs);

331 FFSWAP(int *, runs, ref);

332 }

333 dst += stride;

334 }

335 ret = 0;

336 fail:

337 av_free(runs);

338 av_free(ref);

339 return ret;

340 }

Generated on Wed Jul 10 2013 23:47:57 for FFmpeg by doxygen 1.8.2