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Original Path: trunk/xvidcore/src/bitstream/mbcoding.c
| 1 : | edgomez | 451 | /***************************************************************************** |
| 2 : | * | ||
| 3 : | * XVID MPEG-4 VIDEO CODEC | ||
| 4 : | edgomez | 453 | * - Macro Block coding functions - |
| 5 : | edgomez | 451 | * |
| 6 : | * Copyright(C) 2002 Michael Militzer <isibaar@xvid.org> | ||
| 7 : | * | ||
| 8 : | edgomez | 655 | * This file is part of XviD, a free MPEG-4 video encoder/decoder |
| 9 : | edgomez | 451 | * |
| 10 : | edgomez | 655 | * XviD is free software; you can redistribute it and/or modify it |
| 11 : | * under the terms of the GNU General Public License as published by | ||
| 12 : | edgomez | 451 | * the Free Software Foundation; either version 2 of the License, or |
| 13 : | * (at your option) any later version. | ||
| 14 : | * | ||
| 15 : | * This program is distributed in the hope that it will be useful, | ||
| 16 : | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 17 : | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 18 : | * GNU General Public License for more details. | ||
| 19 : | * | ||
| 20 : | * You should have received a copy of the GNU General Public License | ||
| 21 : | * along with this program; if not, write to the Free Software | ||
| 22 : | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
| 23 : | * | ||
| 24 : | edgomez | 655 | * Under section 8 of the GNU General Public License, the copyright |
| 25 : | * holders of XVID explicitly forbid distribution in the following | ||
| 26 : | * countries: | ||
| 27 : | edgomez | 451 | * |
| 28 : | edgomez | 655 | * - Japan |
| 29 : | * - United States of America | ||
| 30 : | * | ||
| 31 : | * Linking XviD statically or dynamically with other modules is making a | ||
| 32 : | * combined work based on XviD. Thus, the terms and conditions of the | ||
| 33 : | * GNU General Public License cover the whole combination. | ||
| 34 : | * | ||
| 35 : | * As a special exception, the copyright holders of XviD give you | ||
| 36 : | * permission to link XviD with independent modules that communicate with | ||
| 37 : | * XviD solely through the VFW1.1 and DShow interfaces, regardless of the | ||
| 38 : | * license terms of these independent modules, and to copy and distribute | ||
| 39 : | * the resulting combined work under terms of your choice, provided that | ||
| 40 : | * every copy of the combined work is accompanied by a complete copy of | ||
| 41 : | * the source code of XviD (the version of XviD used to produce the | ||
| 42 : | * combined work), being distributed under the terms of the GNU General | ||
| 43 : | * Public License plus this exception. An independent module is a module | ||
| 44 : | * which is not derived from or based on XviD. | ||
| 45 : | * | ||
| 46 : | * Note that people who make modified versions of XviD are not obligated | ||
| 47 : | * to grant this special exception for their modified versions; it is | ||
| 48 : | * their choice whether to do so. The GNU General Public License gives | ||
| 49 : | * permission to release a modified version without this exception; this | ||
| 50 : | * exception also makes it possible to release a modified version which | ||
| 51 : | * carries forward this exception. | ||
| 52 : | * | ||
| 53 : | edgomez | 816 | * $Id: mbcoding.c,v 1.40 2003-02-06 00:48:08 edgomez Exp $ |
| 54 : | edgomez | 655 | * |
| 55 : | edgomez | 451 | ****************************************************************************/ |
| 56 : | suxen_drol | 118 | |
| 57 : | Isibaar | 100 | #include <stdlib.h> |
| 58 : | Isibaar | 3 | #include "../portab.h" |
| 59 : | #include "bitstream.h" | ||
| 60 : | #include "zigzag.h" | ||
| 61 : | #include "vlc_codes.h" | ||
| 62 : | Isibaar | 100 | #include "mbcoding.h" |
| 63 : | Isibaar | 3 | |
| 64 : | #include "../utils/mbfunctions.h" | ||
| 65 : | |||
| 66 : | #define ABS(X) (((X)>0)?(X):-(X)) | ||
| 67 : | #define CLIP(X,A) (X > A) ? (A) : (X) | ||
| 68 : | |||
| 69 : | edgomez | 766 | /* #define BIGLUT */ |
| 70 : | edgomez | 764 | |
| 71 : | edgomez | 766 | #ifdef BIGLUT |
| 72 : | edgomez | 764 | #define LEVELOFFSET 2048 |
| 73 : | #else | ||
| 74 : | #define LEVELOFFSET 32 | ||
| 75 : | #endif | ||
| 76 : | |||
| 77 : | edgomez | 451 | /***************************************************************************** |
| 78 : | * Local data | ||
| 79 : | ****************************************************************************/ | ||
| 80 : | Isibaar | 100 | |
| 81 : | edgomez | 764 | static REVERSE_EVENT DCT3D[2][4096]; |
| 82 : | Isibaar | 3 | |
| 83 : | edgomez | 766 | #ifdef BIGLUT |
| 84 : | edgomez | 764 | static VLC coeff_VLC[2][2][4096][64]; |
| 85 : | edgomez | 766 | static VLC *intra_table, *inter_table; |
| 86 : | edgomez | 764 | #else |
| 87 : | static VLC coeff_VLC[2][2][64][64]; | ||
| 88 : | #endif | ||
| 89 : | edgomez | 451 | |
| 90 : | /***************************************************************************** | ||
| 91 : | edgomez | 453 | * Vector Length Coding Initialization |
| 92 : | edgomez | 451 | ****************************************************************************/ |
| 93 : | |||
| 94 : | edgomez | 195 | void |
| 95 : | init_vlc_tables(void) | ||
| 96 : | Isibaar | 3 | { |
| 97 : | edgomez | 816 | uint32_t i, j, intra, last, run, run_esc, level, level_esc, escape, escape_len, offset; |
| 98 : | edgomez | 78 | |
| 99 : | edgomez | 766 | #ifdef BIGLUT |
| 100 : | intra_table = (VLC*)coeff_VLC[1]; | ||
| 101 : | inter_table = (VLC*)coeff_VLC[0]; | ||
| 102 : | edgomez | 764 | #endif |
| 103 : | Isibaar | 3 | |
| 104 : | edgomez | 195 | |
| 105 : | edgomez | 764 | for (intra = 0; intra < 2; intra++) |
| 106 : | for (i = 0; i < 4096; i++) | ||
| 107 : | DCT3D[intra][i].event.level = 0; | ||
| 108 : | edgomez | 195 | |
| 109 : | edgomez | 764 | for (intra = 0; intra < 2; intra++) |
| 110 : | for (last = 0; last < 2; last++) | ||
| 111 : | { | ||
| 112 : | for (run = 0; run < 63 + last; run++) | ||
| 113 : | for (level = 0; level < 32 << intra; level++) | ||
| 114 : | { | ||
| 115 : | edgomez | 766 | #ifdef BIGLUT |
| 116 : | edgomez | 764 | offset = LEVELOFFSET; |
| 117 : | #else | ||
| 118 : | offset = !intra * LEVELOFFSET; | ||
| 119 : | #endif | ||
| 120 : | coeff_VLC[intra][last][level + offset][run].len = 128; | ||
| 121 : | } | ||
| 122 : | } | ||
| 123 : | Isibaar | 3 | |
| 124 : | edgomez | 764 | for (intra = 0; intra < 2; intra++) |
| 125 : | for (i = 0; i < 102; i++) | ||
| 126 : | { | ||
| 127 : | edgomez | 766 | #ifdef BIGLUT |
| 128 : | edgomez | 764 | offset = LEVELOFFSET; |
| 129 : | #else | ||
| 130 : | offset = !intra * LEVELOFFSET; | ||
| 131 : | #endif | ||
| 132 : | edgomez | 816 | for (j = 0; j < (uint32_t)(1 << (12 - coeff_tab[intra][i].vlc.len)); j++) |
| 133 : | edgomez | 764 | { |
| 134 : | DCT3D[intra][(coeff_tab[intra][i].vlc.code << (12 - coeff_tab[intra][i].vlc.len)) | j].len = coeff_tab[intra][i].vlc.len; | ||
| 135 : | DCT3D[intra][(coeff_tab[intra][i].vlc.code << (12 - coeff_tab[intra][i].vlc.len)) | j].event = coeff_tab[intra][i].event; | ||
| 136 : | } | ||
| 137 : | edgomez | 195 | |
| 138 : | edgomez | 764 | coeff_VLC[intra][coeff_tab[intra][i].event.last][coeff_tab[intra][i].event.level + offset][coeff_tab[intra][i].event.run].code |
| 139 : | = coeff_tab[intra][i].vlc.code << 1; | ||
| 140 : | coeff_VLC[intra][coeff_tab[intra][i].event.last][coeff_tab[intra][i].event.level + offset][coeff_tab[intra][i].event.run].len | ||
| 141 : | = coeff_tab[intra][i].vlc.len + 1; | ||
| 142 : | edgomez | 766 | #ifndef BIGLUT |
| 143 : | edgomez | 764 | if (!intra) |
| 144 : | #endif | ||
| 145 : | { | ||
| 146 : | coeff_VLC[intra][coeff_tab[intra][i].event.last][offset - coeff_tab[intra][i].event.level][coeff_tab[intra][i].event.run].code | ||
| 147 : | = (coeff_tab[intra][i].vlc.code << 1) | 1; | ||
| 148 : | coeff_VLC[intra][coeff_tab[intra][i].event.last][offset - coeff_tab[intra][i].event.level][coeff_tab[intra][i].event.run].len | ||
| 149 : | = coeff_tab[intra][i].vlc.len + 1; | ||
| 150 : | } | ||
| 151 : | } | ||
| 152 : | edgomez | 195 | |
| 153 : | edgomez | 764 | for (intra = 0; intra < 2; intra++) |
| 154 : | for (last = 0; last < 2; last++) | ||
| 155 : | for (run = 0; run < 63 + last; run++) | ||
| 156 : | { | ||
| 157 : | edgomez | 816 | for (level = 1; level < (uint32_t)(32 << intra); level++) |
| 158 : | edgomez | 764 | { |
| 159 : | edgomez | 766 | if (level <= max_level[intra][last][run] && run <= max_run[intra][last][level]) |
| 160 : | continue; | ||
| 161 : | |||
| 162 : | #ifdef BIGLUT | ||
| 163 : | edgomez | 764 | offset = LEVELOFFSET; |
| 164 : | #else | ||
| 165 : | offset = !intra * LEVELOFFSET; | ||
| 166 : | #endif | ||
| 167 : | edgomez | 766 | level_esc = level - max_level[intra][last][run]; |
| 168 : | run_esc = run - 1 - max_run[intra][last][level]; | ||
| 169 : | |||
| 170 : | if (level_esc <= max_level[intra][last][run] && run <= max_run[intra][last][level_esc]) | ||
| 171 : | { | ||
| 172 : | escape = ESCAPE1; | ||
| 173 : | escape_len = 7 + 1; | ||
| 174 : | run_esc = run; | ||
| 175 : | } | ||
| 176 : | else | ||
| 177 : | { | ||
| 178 : | edgomez | 816 | if (run_esc <= max_run[intra][last][level] && level <= max_level[intra][last][run_esc]) |
| 179 : | edgomez | 764 | { |
| 180 : | edgomez | 766 | escape = ESCAPE2; |
| 181 : | escape_len = 7 + 2; | ||
| 182 : | level_esc = level; | ||
| 183 : | edgomez | 764 | } |
| 184 : | edgomez | 766 | else |
| 185 : | edgomez | 764 | { |
| 186 : | edgomez | 766 | #ifndef BIGLUT |
| 187 : | edgomez | 764 | if (!intra) |
| 188 : | #endif | ||
| 189 : | { | ||
| 190 : | edgomez | 766 | coeff_VLC[intra][last][level + offset][run].code |
| 191 : | = (ESCAPE3 << 21) | (last << 20) | (run << 14) | (1 << 13) | ((level & 0xfff) << 1) | 1; | ||
| 192 : | coeff_VLC[intra][last][level + offset][run].len = 30; | ||
| 193 : | coeff_VLC[intra][last][offset - level][run].code | ||
| 194 : | = (ESCAPE3 << 21) | (last << 20) | (run << 14) | (1 << 13) | ((-level & 0xfff) << 1) | 1; | ||
| 195 : | coeff_VLC[intra][last][offset - level][run].len = 30; | ||
| 196 : | edgomez | 764 | } |
| 197 : | edgomez | 766 | continue; |
| 198 : | edgomez | 764 | } |
| 199 : | edgomez | 766 | } |
| 200 : | |||
| 201 : | coeff_VLC[intra][last][level + offset][run].code | ||
| 202 : | = (escape << coeff_VLC[intra][last][level_esc + offset][run_esc].len) | ||
| 203 : | | coeff_VLC[intra][last][level_esc + offset][run_esc].code; | ||
| 204 : | coeff_VLC[intra][last][level + offset][run].len | ||
| 205 : | = coeff_VLC[intra][last][level_esc + offset][run_esc].len + escape_len; | ||
| 206 : | #ifndef BIGLUT | ||
| 207 : | edgomez | 764 | if (!intra) |
| 208 : | #endif | ||
| 209 : | edgomez | 766 | { |
| 210 : | coeff_VLC[intra][last][offset - level][run].code | ||
| 211 : | = (escape << coeff_VLC[intra][last][level_esc + offset][run_esc].len) | ||
| 212 : | | coeff_VLC[intra][last][level_esc + offset][run_esc].code | 1; | ||
| 213 : | coeff_VLC[intra][last][offset - level][run].len | ||
| 214 : | = coeff_VLC[intra][last][level_esc + offset][run_esc].len + escape_len; | ||
| 215 : | } | ||
| 216 : | Isibaar | 3 | } |
| 217 : | edgomez | 766 | |
| 218 : | #ifdef BIGLUT | ||
| 219 : | edgomez | 816 | for (level = (uint32_t)(32 << intra); level < 2048; level++) |
| 220 : | edgomez | 764 | { |
| 221 : | coeff_VLC[intra][last][level + offset][run].code | ||
| 222 : | = (ESCAPE3 << 21) | (last << 20) | (run << 14) | (1 << 13) | ((level & 0xfff) << 1) | 1; | ||
| 223 : | coeff_VLC[intra][last][level + offset][run].len = 30; | ||
| 224 : | Isibaar | 100 | |
| 225 : | edgomez | 764 | coeff_VLC[intra][last][offset - level][run].code |
| 226 : | = (ESCAPE3 << 21) | (last << 20) | (run << 14) | (1 << 13) | ((-level & 0xfff) << 1) | 1; | ||
| 227 : | coeff_VLC[intra][last][offset - level][run].len = 30; | ||
| 228 : | Isibaar | 100 | } |
| 229 : | edgomez | 764 | #else |
| 230 : | if (!intra) | ||
| 231 : | { | ||
| 232 : | coeff_VLC[intra][last][0][run].code | ||
| 233 : | = (ESCAPE3 << 21) | (last << 20) | (run << 14) | (1 << 13) | ((-32 & 0xfff) << 1) | 1; | ||
| 234 : | coeff_VLC[intra][last][0][run].len = 30; | ||
| 235 : | } | ||
| 236 : | #endif | ||
| 237 : | Isibaar | 3 | } |
| 238 : | } | ||
| 239 : | |||
| 240 : | edgomez | 453 | /***************************************************************************** |
| 241 : | * Local inlined functions for MB coding | ||
| 242 : | ****************************************************************************/ | ||
| 243 : | |||
| 244 : | edgomez | 195 | static __inline void |
| 245 : | CodeVector(Bitstream * bs, | ||
| 246 : | int32_t value, | ||
| 247 : | int32_t f_code, | ||
| 248 : | Statistics * pStat) | ||
| 249 : | Isibaar | 3 | { |
| 250 : | edgomez | 78 | |
| 251 : | Isibaar | 3 | const int scale_factor = 1 << (f_code - 1); |
| 252 : | const int cmp = scale_factor << 5; | ||
| 253 : | |||
| 254 : | edgomez | 195 | if (value < (-1 * cmp)) |
| 255 : | Isibaar | 3 | value += 64 * scale_factor; |
| 256 : | edgomez | 195 | |
| 257 : | if (value > (cmp - 1)) | ||
| 258 : | Isibaar | 3 | value -= 64 * scale_factor; |
| 259 : | |||
| 260 : | edgomez | 78 | pStat->iMvSum += value * value; |
| 261 : | pStat->iMvCount++; | ||
| 262 : | Isibaar | 3 | |
| 263 : | edgomez | 78 | if (value == 0) { |
| 264 : | edgomez | 195 | BitstreamPutBits(bs, mb_motion_table[32].code, |
| 265 : | mb_motion_table[32].len); | ||
| 266 : | edgomez | 78 | } else { |
| 267 : | Isibaar | 3 | uint16_t length, code, mv_res, sign; |
| 268 : | edgomez | 195 | |
| 269 : | Isibaar | 3 | length = 16 << f_code; |
| 270 : | f_code--; | ||
| 271 : | edgomez | 195 | |
| 272 : | Isibaar | 3 | sign = (value < 0); |
| 273 : | |||
| 274 : | edgomez | 195 | if (value >= length) |
| 275 : | Isibaar | 3 | value -= 2 * length; |
| 276 : | edgomez | 195 | else if (value < -length) |
| 277 : | Isibaar | 3 | value += 2 * length; |
| 278 : | |||
| 279 : | edgomez | 195 | if (sign) |
| 280 : | Isibaar | 3 | value = -value; |
| 281 : | |||
| 282 : | value--; | ||
| 283 : | mv_res = value & ((1 << f_code) - 1); | ||
| 284 : | code = ((value - mv_res) >> f_code) + 1; | ||
| 285 : | |||
| 286 : | edgomez | 195 | if (sign) |
| 287 : | Isibaar | 3 | code = -code; |
| 288 : | |||
| 289 : | code += 32; | ||
| 290 : | edgomez | 195 | BitstreamPutBits(bs, mb_motion_table[code].code, |
| 291 : | mb_motion_table[code].len); | ||
| 292 : | |||
| 293 : | if (f_code) | ||
| 294 : | Isibaar | 3 | BitstreamPutBits(bs, mv_res, f_code); |
| 295 : | edgomez | 78 | } |
| 296 : | |||
| 297 : | Isibaar | 3 | } |
| 298 : | |||
| 299 : | edgomez | 766 | #ifdef BIGLUT |
| 300 : | edgomez | 764 | |
| 301 : | edgomez | 195 | static __inline void |
| 302 : | CodeCoeff(Bitstream * bs, | ||
| 303 : | const int16_t qcoeff[64], | ||
| 304 : | VLC * table, | ||
| 305 : | const uint16_t * zigzag, | ||
| 306 : | uint16_t intra) | ||
| 307 : | edgomez | 78 | { |
| 308 : | |||
| 309 : | Isibaar | 3 | uint32_t j, last; |
| 310 : | short v; | ||
| 311 : | VLC *vlc; | ||
| 312 : | edgomez | 195 | |
| 313 : | Isibaar | 3 | j = intra; |
| 314 : | Isibaar | 116 | last = intra; |
| 315 : | Isibaar | 3 | |
| 316 : | edgomez | 195 | while (j < 64 && (v = qcoeff[zigzag[j]]) == 0) |
| 317 : | j++; | ||
| 318 : | |||
| 319 : | Isibaar | 3 | do { |
| 320 : | edgomez | 764 | vlc = table + 64 * 2048 + (v << 6) + j - last; |
| 321 : | Isibaar | 116 | last = ++j; |
| 322 : | Isibaar | 153 | |
| 323 : | edgomez | 677 | /* count zeroes */ |
| 324 : | edgomez | 195 | while (j < 64 && (v = qcoeff[zigzag[j]]) == 0) |
| 325 : | j++; | ||
| 326 : | |||
| 327 : | edgomez | 677 | /* write code */ |
| 328 : | edgomez | 195 | if (j != 64) { |
| 329 : | Isibaar | 3 | BitstreamPutBits(bs, vlc->code, vlc->len); |
| 330 : | } else { | ||
| 331 : | edgomez | 764 | vlc += 64 * 4096; |
| 332 : | Isibaar | 3 | BitstreamPutBits(bs, vlc->code, vlc->len); |
| 333 : | break; | ||
| 334 : | } | ||
| 335 : | edgomez | 195 | } while (1); |
| 336 : | edgomez | 78 | |
| 337 : | Isibaar | 3 | } |
| 338 : | |||
| 339 : | edgomez | 764 | #else |
| 340 : | |||
| 341 : | static __inline void | ||
| 342 : | CodeCoeffInter(Bitstream * bs, | ||
| 343 : | const int16_t qcoeff[64], | ||
| 344 : | const uint16_t * zigzag) | ||
| 345 : | { | ||
| 346 : | uint32_t i, run, prev_run, code, len; | ||
| 347 : | int32_t level, prev_level, level_shifted; | ||
| 348 : | |||
| 349 : | i = 0; | ||
| 350 : | run = 0; | ||
| 351 : | |||
| 352 : | while (!(level = qcoeff[zigzag[i++]])) | ||
| 353 : | run++; | ||
| 354 : | |||
| 355 : | prev_level = level; | ||
| 356 : | prev_run = run; | ||
| 357 : | run = 0; | ||
| 358 : | |||
| 359 : | while (i < 64) | ||
| 360 : | { | ||
| 361 : | if ((level = qcoeff[zigzag[i++]]) != 0) | ||
| 362 : | { | ||
| 363 : | level_shifted = prev_level + 32; | ||
| 364 : | if (!(level_shifted & -64)) | ||
| 365 : | { | ||
| 366 : | code = coeff_VLC[0][0][level_shifted][prev_run].code; | ||
| 367 : | len = coeff_VLC[0][0][level_shifted][prev_run].len; | ||
| 368 : | } | ||
| 369 : | else | ||
| 370 : | { | ||
| 371 : | code = (ESCAPE3 << 21) | (prev_run << 14) | (1 << 13) | ((prev_level & 0xfff) << 1) | 1; | ||
| 372 : | len = 30; | ||
| 373 : | } | ||
| 374 : | BitstreamPutBits(bs, code, len); | ||
| 375 : | prev_level = level; | ||
| 376 : | prev_run = run; | ||
| 377 : | run = 0; | ||
| 378 : | } | ||
| 379 : | else | ||
| 380 : | run++; | ||
| 381 : | } | ||
| 382 : | |||
| 383 : | level_shifted = prev_level + 32; | ||
| 384 : | if (!(level_shifted & -64)) | ||
| 385 : | { | ||
| 386 : | code = coeff_VLC[0][1][level_shifted][prev_run].code; | ||
| 387 : | len = coeff_VLC[0][1][level_shifted][prev_run].len; | ||
| 388 : | } | ||
| 389 : | else | ||
| 390 : | { | ||
| 391 : | code = (ESCAPE3 << 21) | (1 << 20) | (prev_run << 14) | (1 << 13) | ((prev_level & 0xfff) << 1) | 1; | ||
| 392 : | len = 30; | ||
| 393 : | } | ||
| 394 : | BitstreamPutBits(bs, code, len); | ||
| 395 : | } | ||
| 396 : | |||
| 397 : | static __inline void | ||
| 398 : | CodeCoeffIntra(Bitstream * bs, | ||
| 399 : | const int16_t qcoeff[64], | ||
| 400 : | const uint16_t * zigzag) | ||
| 401 : | { | ||
| 402 : | uint32_t i, abs_level, run, prev_run, code, len; | ||
| 403 : | int32_t level, prev_level; | ||
| 404 : | |||
| 405 : | i = 1; | ||
| 406 : | run = 0; | ||
| 407 : | |||
| 408 : | while (!(level = qcoeff[zigzag[i++]])) | ||
| 409 : | run++; | ||
| 410 : | |||
| 411 : | prev_level = level; | ||
| 412 : | prev_run = run; | ||
| 413 : | run = 0; | ||
| 414 : | |||
| 415 : | while (i < 64) | ||
| 416 : | { | ||
| 417 : | if ((level = qcoeff[zigzag[i++]]) != 0) | ||
| 418 : | { | ||
| 419 : | abs_level = ABS(prev_level); | ||
| 420 : | abs_level = abs_level < 64 ? abs_level : 0; | ||
| 421 : | code = coeff_VLC[1][0][abs_level][prev_run].code; | ||
| 422 : | len = coeff_VLC[1][0][abs_level][prev_run].len; | ||
| 423 : | if (len != 128) | ||
| 424 : | code |= (prev_level < 0); | ||
| 425 : | else | ||
| 426 : | { | ||
| 427 : | code = (ESCAPE3 << 21) | (prev_run << 14) | (1 << 13) | ((prev_level & 0xfff) << 1) | 1; | ||
| 428 : | len = 30; | ||
| 429 : | } | ||
| 430 : | BitstreamPutBits(bs, code, len); | ||
| 431 : | prev_level = level; | ||
| 432 : | prev_run = run; | ||
| 433 : | run = 0; | ||
| 434 : | } | ||
| 435 : | else | ||
| 436 : | run++; | ||
| 437 : | } | ||
| 438 : | |||
| 439 : | abs_level = ABS(prev_level); | ||
| 440 : | abs_level = abs_level < 64 ? abs_level : 0; | ||
| 441 : | code = coeff_VLC[1][1][abs_level][prev_run].code; | ||
| 442 : | len = coeff_VLC[1][1][abs_level][prev_run].len; | ||
| 443 : | if (len != 128) | ||
| 444 : | code |= (prev_level < 0); | ||
| 445 : | else | ||
| 446 : | { | ||
| 447 : | code = (ESCAPE3 << 21) | (1 << 20) | (prev_run << 14) | (1 << 13) | ((prev_level & 0xfff) << 1) | 1; | ||
| 448 : | len = 30; | ||
| 449 : | } | ||
| 450 : | BitstreamPutBits(bs, code, len); | ||
| 451 : | } | ||
| 452 : | |||
| 453 : | #endif | ||
| 454 : | |||
| 455 : | edgomez | 453 | /***************************************************************************** |
| 456 : | * Local functions | ||
| 457 : | ****************************************************************************/ | ||
| 458 : | Isibaar | 3 | |
| 459 : | edgomez | 195 | static void |
| 460 : | CodeBlockIntra(const FRAMEINFO * frame, | ||
| 461 : | const MACROBLOCK * pMB, | ||
| 462 : | int16_t qcoeff[6 * 64], | ||
| 463 : | edgomez | 78 | Bitstream * bs, |
| 464 : | Statistics * pStat) | ||
| 465 : | Isibaar | 3 | { |
| 466 : | edgomez | 78 | |
| 467 : | Isibaar | 3 | uint32_t i, mcbpc, cbpy, bits; |
| 468 : | |||
| 469 : | cbpy = pMB->cbp >> 2; | ||
| 470 : | |||
| 471 : | edgomez | 677 | /* write mcbpc */ |
| 472 : | edgomez | 195 | if (frame->coding_type == I_VOP) { |
| 473 : | edgomez | 78 | mcbpc = ((pMB->mode >> 1) & 3) | ((pMB->cbp & 3) << 2); |
| 474 : | edgomez | 195 | BitstreamPutBits(bs, mcbpc_intra_tab[mcbpc].code, |
| 475 : | mcbpc_intra_tab[mcbpc].len); | ||
| 476 : | } else { | ||
| 477 : | edgomez | 78 | mcbpc = (pMB->mode & 7) | ((pMB->cbp & 3) << 3); |
| 478 : | edgomez | 195 | BitstreamPutBits(bs, mcbpc_inter_tab[mcbpc].code, |
| 479 : | mcbpc_inter_tab[mcbpc].len); | ||
| 480 : | Isibaar | 28 | } |
| 481 : | Isibaar | 3 | |
| 482 : | edgomez | 677 | /* ac prediction flag */ |
| 483 : | edgomez | 195 | if (pMB->acpred_directions[0]) |
| 484 : | edgomez | 78 | BitstreamPutBits(bs, 1, 1); |
| 485 : | Isibaar | 3 | else |
| 486 : | edgomez | 78 | BitstreamPutBits(bs, 0, 1); |
| 487 : | Isibaar | 3 | |
| 488 : | edgomez | 677 | /* write cbpy */ |
| 489 : | edgomez | 195 | BitstreamPutBits(bs, cbpy_tab[cbpy].code, cbpy_tab[cbpy].len); |
| 490 : | Isibaar | 3 | |
| 491 : | edgomez | 677 | /* write dquant */ |
| 492 : | edgomez | 195 | if (pMB->mode == MODE_INTRA_Q) |
| 493 : | Isibaar | 3 | BitstreamPutBits(bs, pMB->dquant, 2); |
| 494 : | |||
| 495 : | edgomez | 677 | /* write interlacing */ |
| 496 : | edgomez | 195 | if (frame->global_flags & XVID_INTERLACING) { |
| 497 : | h | 69 | BitstreamPutBit(bs, pMB->field_dct); |
| 498 : | } | ||
| 499 : | edgomez | 677 | /* code block coeffs */ |
| 500 : | edgomez | 195 | for (i = 0; i < 6; i++) { |
| 501 : | if (i < 4) | ||
| 502 : | BitstreamPutBits(bs, dcy_tab[qcoeff[i * 64 + 0] + 255].code, | ||
| 503 : | dcy_tab[qcoeff[i * 64 + 0] + 255].len); | ||
| 504 : | Isibaar | 3 | else |
| 505 : | edgomez | 195 | BitstreamPutBits(bs, dcc_tab[qcoeff[i * 64 + 0] + 255].code, |
| 506 : | dcc_tab[qcoeff[i * 64 + 0] + 255].len); | ||
| 507 : | |||
| 508 : | if (pMB->cbp & (1 << (5 - i))) { | ||
| 509 : | Isibaar | 3 | bits = BitstreamPos(bs); |
| 510 : | |||
| 511 : | edgomez | 766 | #ifdef BIGLUT |
| 512 : | edgomez | 195 | CodeCoeff(bs, &qcoeff[i * 64], intra_table, |
| 513 : | scan_tables[pMB->acpred_directions[i]], 1); | ||
| 514 : | edgomez | 764 | #else |
| 515 : | CodeCoeffIntra(bs, &qcoeff[i * 64], scan_tables[pMB->acpred_directions[i]]); | ||
| 516 : | #endif | ||
| 517 : | Isibaar | 3 | bits = BitstreamPos(bs) - bits; |
| 518 : | pStat->iTextBits += bits; | ||
| 519 : | } | ||
| 520 : | } | ||
| 521 : | edgomez | 78 | |
| 522 : | Isibaar | 3 | } |
| 523 : | |||
| 524 : | |||
| 525 : | edgomez | 195 | static void |
| 526 : | CodeBlockInter(const FRAMEINFO * frame, | ||
| 527 : | const MACROBLOCK * pMB, | ||
| 528 : | int16_t qcoeff[6 * 64], | ||
| 529 : | edgomez | 78 | Bitstream * bs, |
| 530 : | Statistics * pStat) | ||
| 531 : | Isibaar | 3 | { |
| 532 : | edgomez | 78 | |
| 533 : | Isibaar | 3 | int32_t i; |
| 534 : | uint32_t bits, mcbpc, cbpy; | ||
| 535 : | |||
| 536 : | edgomez | 78 | mcbpc = (pMB->mode & 7) | ((pMB->cbp & 3) << 3); |
| 537 : | Isibaar | 3 | cbpy = 15 - (pMB->cbp >> 2); |
| 538 : | |||
| 539 : | edgomez | 677 | /* write mcbpc */ |
| 540 : | edgomez | 195 | BitstreamPutBits(bs, mcbpc_inter_tab[mcbpc].code, |
| 541 : | mcbpc_inter_tab[mcbpc].len); | ||
| 542 : | Isibaar | 3 | |
| 543 : | edgomez | 677 | /* write cbpy */ |
| 544 : | Isibaar | 3 | BitstreamPutBits(bs, cbpy_tab[cbpy].code, cbpy_tab[cbpy].len); |
| 545 : | |||
| 546 : | edgomez | 677 | /* write dquant */ |
| 547 : | edgomez | 195 | if (pMB->mode == MODE_INTER_Q) |
| 548 : | Isibaar | 3 | BitstreamPutBits(bs, pMB->dquant, 2); |
| 549 : | edgomez | 195 | |
| 550 : | edgomez | 677 | /* interlacing */ |
| 551 : | edgomez | 195 | if (frame->global_flags & XVID_INTERLACING) { |
| 552 : | h | 388 | if (pMB->cbp) { |
| 553 : | BitstreamPutBit(bs, pMB->field_dct); | ||
| 554 : | edgomez | 514 | DPRINTF(DPRINTF_DEBUG, "codep: field_dct: %d", pMB->field_dct); |
| 555 : | h | 388 | } |
| 556 : | h | 69 | |
| 557 : | edgomez | 677 | /* if inter block, write field ME flag */ |
| 558 : | edgomez | 195 | if (pMB->mode == MODE_INTER || pMB->mode == MODE_INTER_Q) { |
| 559 : | h | 69 | BitstreamPutBit(bs, pMB->field_pred); |
| 560 : | edgomez | 514 | DPRINTF(DPRINTF_DEBUG, "codep: field_pred: %d", pMB->field_pred); |
| 561 : | h | 69 | |
| 562 : | edgomez | 677 | /* write field prediction references */ |
| 563 : | edgomez | 195 | if (pMB->field_pred) { |
| 564 : | h | 69 | BitstreamPutBit(bs, pMB->field_for_top); |
| 565 : | BitstreamPutBit(bs, pMB->field_for_bot); | ||
| 566 : | } | ||
| 567 : | } | ||
| 568 : | } | ||
| 569 : | edgomez | 677 | /* code motion vector(s) */ |
| 570 : | edgomez | 195 | for (i = 0; i < (pMB->mode == MODE_INTER4V ? 4 : 1); i++) { |
| 571 : | suxen_drol | 136 | CodeVector(bs, pMB->pmvs[i].x, frame->fcode, pStat); |
| 572 : | CodeVector(bs, pMB->pmvs[i].y, frame->fcode, pStat); | ||
| 573 : | Isibaar | 3 | } |
| 574 : | |||
| 575 : | bits = BitstreamPos(bs); | ||
| 576 : | edgomez | 195 | |
| 577 : | edgomez | 677 | /* code block coeffs */ |
| 578 : | edgomez | 195 | for (i = 0; i < 6; i++) |
| 579 : | if (pMB->cbp & (1 << (5 - i))) | ||
| 580 : | edgomez | 766 | #ifdef BIGLUT |
| 581 : | edgomez | 195 | CodeCoeff(bs, &qcoeff[i * 64], inter_table, scan_tables[0], 0); |
| 582 : | edgomez | 764 | #else |
| 583 : | CodeCoeffInter(bs, &qcoeff[i * 64], scan_tables[0]); | ||
| 584 : | #endif | ||
| 585 : | Isibaar | 3 | |
| 586 : | bits = BitstreamPos(bs) - bits; | ||
| 587 : | pStat->iTextBits += bits; | ||
| 588 : | edgomez | 78 | |
| 589 : | Isibaar | 3 | } |
| 590 : | |||
| 591 : | edgomez | 453 | /***************************************************************************** |
| 592 : | * Macro Block bitstream encoding functions | ||
| 593 : | ****************************************************************************/ | ||
| 594 : | Isibaar | 3 | |
| 595 : | edgomez | 195 | void |
| 596 : | MBCoding(const FRAMEINFO * frame, | ||
| 597 : | MACROBLOCK * pMB, | ||
| 598 : | int16_t qcoeff[6 * 64], | ||
| 599 : | Bitstream * bs, | ||
| 600 : | Statistics * pStat) | ||
| 601 : | Isibaar | 3 | { |
| 602 : | edgomez | 78 | |
| 603 : | edgomez | 195 | if (frame->coding_type == P_VOP) { |
| 604 : | edgomez | 677 | BitstreamPutBit(bs, 0); /* coded */ |
| 605 : | Isibaar | 3 | } |
| 606 : | |||
| 607 : | chl | 335 | if (pMB->mode == MODE_INTRA || pMB->mode == MODE_INTRA_Q) |
| 608 : | suxen_drol | 136 | CodeBlockIntra(frame, pMB, qcoeff, bs, pStat); |
| 609 : | Isibaar | 3 | else |
| 610 : | suxen_drol | 136 | CodeBlockInter(frame, pMB, qcoeff, bs, pStat); |
| 611 : | edgomez | 78 | |
| 612 : | Isibaar | 3 | } |
| 613 : | |||
| 614 : | chl | 347 | |
| 615 : | void | ||
| 616 : | MBSkip(Bitstream * bs) | ||
| 617 : | { | ||
| 618 : | edgomez | 677 | BitstreamPutBit(bs, 1); /* not coded */ |
| 619 : | chl | 347 | return; |
| 620 : | } | ||
| 621 : | |||
| 622 : | edgomez | 453 | /***************************************************************************** |
| 623 : | * decoding stuff starts here | ||
| 624 : | ****************************************************************************/ | ||
| 625 : | suxen_drol | 118 | |
| 626 : | edgomez | 453 | /* |
| 627 : | * For IVOP addbits == 0 | ||
| 628 : | * For PVOP addbits == fcode - 1 | ||
| 629 : | * For BVOP addbits == max(fcode,bcode) - 1 | ||
| 630 : | * returns true or false | ||
| 631 : | */ | ||
| 632 : | Isibaar | 3 | |
| 633 : | suxen_drol | 248 | int |
| 634 : | check_resync_marker(Bitstream * bs, int addbits) | ||
| 635 : | { | ||
| 636 : | uint32_t nbits; | ||
| 637 : | uint32_t code; | ||
| 638 : | uint32_t nbitsresyncmarker = NUMBITS_VP_RESYNC_MARKER + addbits; | ||
| 639 : | |||
| 640 : | nbits = BitstreamNumBitsToByteAlign(bs); | ||
| 641 : | code = BitstreamShowBits(bs, nbits); | ||
| 642 : | |||
| 643 : | if (code == (((uint32_t)1 << (nbits - 1)) - 1)) | ||
| 644 : | { | ||
| 645 : | return BitstreamShowBitsFromByteAlign(bs, nbitsresyncmarker) == RESYNC_MARKER; | ||
| 646 : | } | ||
| 647 : | |||
| 648 : | return 0; | ||
| 649 : | } | ||
| 650 : | |||
| 651 : | |||
| 652 : | |||
| 653 : | edgomez | 195 | int |
| 654 : | get_mcbpc_intra(Bitstream * bs) | ||
| 655 : | Isibaar | 3 | { |
| 656 : | edgomez | 78 | |
| 657 : | Isibaar | 3 | uint32_t index; |
| 658 : | edgomez | 195 | |
| 659 : | suxen_drol | 248 | index = BitstreamShowBits(bs, 9); |
| 660 : | Isibaar | 3 | index >>= 3; |
| 661 : | |||
| 662 : | BitstreamSkip(bs, mcbpc_intra_table[index].len); | ||
| 663 : | edgomez | 78 | |
| 664 : | Isibaar | 3 | return mcbpc_intra_table[index].code; |
| 665 : | edgomez | 78 | |
| 666 : | Isibaar | 3 | } |
| 667 : | |||
| 668 : | edgomez | 195 | int |
| 669 : | get_mcbpc_inter(Bitstream * bs) | ||
| 670 : | Isibaar | 3 | { |
| 671 : | edgomez | 78 | |
| 672 : | Isibaar | 3 | uint32_t index; |
| 673 : | suxen_drol | 248 | |
| 674 : | index = CLIP(BitstreamShowBits(bs, 9), 256); | ||
| 675 : | edgomez | 195 | |
| 676 : | BitstreamSkip(bs, mcbpc_inter_table[index].len); | ||
| 677 : | edgomez | 78 | |
| 678 : | Isibaar | 3 | return mcbpc_inter_table[index].code; |
| 679 : | edgomez | 78 | |
| 680 : | Isibaar | 3 | } |
| 681 : | |||
| 682 : | edgomez | 195 | int |
| 683 : | get_cbpy(Bitstream * bs, | ||
| 684 : | int intra) | ||
| 685 : | Isibaar | 3 | { |
| 686 : | edgomez | 78 | |
| 687 : | Isibaar | 3 | int cbpy; |
| 688 : | uint32_t index = BitstreamShowBits(bs, 6); | ||
| 689 : | |||
| 690 : | BitstreamSkip(bs, cbpy_table[index].len); | ||
| 691 : | cbpy = cbpy_table[index].code; | ||
| 692 : | |||
| 693 : | edgomez | 195 | if (!intra) |
| 694 : | Isibaar | 3 | cbpy = 15 - cbpy; |
| 695 : | |||
| 696 : | return cbpy; | ||
| 697 : | edgomez | 78 | |
| 698 : | Isibaar | 3 | } |
| 699 : | |||
| 700 : | edgomez | 195 | int |
| 701 : | get_mv_data(Bitstream * bs) | ||
| 702 : | Isibaar | 3 | { |
| 703 : | edgomez | 78 | |
| 704 : | Isibaar | 3 | uint32_t index; |
| 705 : | |||
| 706 : | edgomez | 195 | if (BitstreamGetBit(bs)) |
| 707 : | Isibaar | 3 | return 0; |
| 708 : | edgomez | 195 | |
| 709 : | Isibaar | 3 | index = BitstreamShowBits(bs, 12); |
| 710 : | |||
| 711 : | edgomez | 195 | if (index >= 512) { |
| 712 : | Isibaar | 3 | index = (index >> 8) - 2; |
| 713 : | BitstreamSkip(bs, TMNMVtab0[index].len); | ||
| 714 : | return TMNMVtab0[index].code; | ||
| 715 : | } | ||
| 716 : | edgomez | 195 | |
| 717 : | if (index >= 128) { | ||
| 718 : | Isibaar | 3 | index = (index >> 2) - 32; |
| 719 : | BitstreamSkip(bs, TMNMVtab1[index].len); | ||
| 720 : | return TMNMVtab1[index].code; | ||
| 721 : | } | ||
| 722 : | |||
| 723 : | edgomez | 195 | index -= 4; |
| 724 : | Isibaar | 3 | |
| 725 : | BitstreamSkip(bs, TMNMVtab2[index].len); | ||
| 726 : | return TMNMVtab2[index].code; | ||
| 727 : | edgomez | 78 | |
| 728 : | Isibaar | 3 | } |
| 729 : | |||
| 730 : | edgomez | 195 | int |
| 731 : | get_mv(Bitstream * bs, | ||
| 732 : | int fcode) | ||
| 733 : | Isibaar | 3 | { |
| 734 : | edgomez | 78 | |
| 735 : | Isibaar | 3 | int data; |
| 736 : | int res; | ||
| 737 : | int mv; | ||
| 738 : | int scale_fac = 1 << (fcode - 1); | ||
| 739 : | |||
| 740 : | data = get_mv_data(bs); | ||
| 741 : | edgomez | 195 | |
| 742 : | if (scale_fac == 1 || data == 0) | ||
| 743 : | Isibaar | 3 | return data; |
| 744 : | |||
| 745 : | res = BitstreamGetBits(bs, fcode - 1); | ||
| 746 : | mv = ((ABS(data) - 1) * scale_fac) + res + 1; | ||
| 747 : | edgomez | 195 | |
| 748 : | Isibaar | 3 | return data < 0 ? -mv : mv; |
| 749 : | edgomez | 78 | |
| 750 : | Isibaar | 3 | } |
| 751 : | |||
| 752 : | edgomez | 195 | int |
| 753 : | get_dc_dif(Bitstream * bs, | ||
| 754 : | uint32_t dc_size) | ||
| 755 : | Isibaar | 3 | { |
| 756 : | edgomez | 78 | |
| 757 : | Isibaar | 3 | int code = BitstreamGetBits(bs, dc_size); |
| 758 : | int msb = code >> (dc_size - 1); | ||
| 759 : | |||
| 760 : | edgomez | 195 | if (msb == 0) |
| 761 : | return (-1 * (code ^ ((1 << dc_size) - 1))); | ||
| 762 : | Isibaar | 3 | |
| 763 : | return code; | ||
| 764 : | edgomez | 78 | |
| 765 : | Isibaar | 3 | } |
| 766 : | |||
| 767 : | edgomez | 195 | int |
| 768 : | get_dc_size_lum(Bitstream * bs) | ||
| 769 : | Isibaar | 3 | { |
| 770 : | edgomez | 78 | |
| 771 : | Isibaar | 3 | int code, i; |
| 772 : | edgomez | 195 | |
| 773 : | Isibaar | 3 | code = BitstreamShowBits(bs, 11); |
| 774 : | |||
| 775 : | edgomez | 195 | for (i = 11; i > 3; i--) { |
| 776 : | if (code == 1) { | ||
| 777 : | Isibaar | 3 | BitstreamSkip(bs, i); |
| 778 : | return i + 1; | ||
| 779 : | } | ||
| 780 : | code >>= 1; | ||
| 781 : | } | ||
| 782 : | |||
| 783 : | BitstreamSkip(bs, dc_lum_tab[code].len); | ||
| 784 : | return dc_lum_tab[code].code; | ||
| 785 : | edgomez | 78 | |
| 786 : | Isibaar | 3 | } |
| 787 : | |||
| 788 : | |||
| 789 : | edgomez | 195 | int |
| 790 : | get_dc_size_chrom(Bitstream * bs) | ||
| 791 : | Isibaar | 3 | { |
| 792 : | edgomez | 78 | |
| 793 : | Isibaar | 3 | uint32_t code, i; |
| 794 : | edgomez | 195 | |
| 795 : | Isibaar | 3 | code = BitstreamShowBits(bs, 12); |
| 796 : | |||
| 797 : | edgomez | 195 | for (i = 12; i > 2; i--) { |
| 798 : | if (code == 1) { | ||
| 799 : | Isibaar | 3 | BitstreamSkip(bs, i); |
| 800 : | return i; | ||
| 801 : | } | ||
| 802 : | code >>= 1; | ||
| 803 : | } | ||
| 804 : | |||
| 805 : | return 3 - BitstreamGetBits(bs, 2); | ||
| 806 : | edgomez | 78 | |
| 807 : | Isibaar | 3 | } |
| 808 : | |||
| 809 : | edgomez | 453 | /***************************************************************************** |
| 810 : | * Local inlined function to "decode" written vlc codes | ||
| 811 : | ****************************************************************************/ | ||
| 812 : | |||
| 813 : | static __inline int | ||
| 814 : | get_coeff(Bitstream * bs, | ||
| 815 : | int *run, | ||
| 816 : | int *last, | ||
| 817 : | int intra, | ||
| 818 : | int short_video_header) | ||
| 819 : | { | ||
| 820 : | |||
| 821 : | uint32_t mode; | ||
| 822 : | int32_t level; | ||
| 823 : | edgomez | 764 | REVERSE_EVENT *reverse_event; |
| 824 : | edgomez | 453 | |
| 825 : | edgomez | 677 | if (short_video_header) /* inter-VLCs will be used for both intra and inter blocks */ |
| 826 : | edgomez | 453 | intra = 0; |
| 827 : | |||
| 828 : | edgomez | 764 | if (BitstreamShowBits(bs, 7) != ESCAPE) { |
| 829 : | reverse_event = &DCT3D[intra][BitstreamShowBits(bs, 12)]; | ||
| 830 : | edgomez | 453 | |
| 831 : | edgomez | 764 | if ((level = reverse_event->event.level) == 0) |
| 832 : | goto error; | ||
| 833 : | edgomez | 453 | |
| 834 : | edgomez | 764 | *last = reverse_event->event.last; |
| 835 : | *run = reverse_event->event.run; | ||
| 836 : | edgomez | 453 | |
| 837 : | edgomez | 764 | BitstreamSkip(bs, reverse_event->len); |
| 838 : | |||
| 839 : | return BitstreamGetBits(bs, 1) ? -level : level; | ||
| 840 : | edgomez | 453 | } |
| 841 : | |||
| 842 : | edgomez | 764 | BitstreamSkip(bs, 7); |
| 843 : | |||
| 844 : | edgomez | 453 | if (short_video_header) { |
| 845 : | edgomez | 677 | /* escape mode 4 - H.263 type, only used if short_video_header = 1 */ |
| 846 : | edgomez | 453 | *last = BitstreamGetBit(bs); |
| 847 : | *run = BitstreamGetBits(bs, 6); | ||
| 848 : | level = BitstreamGetBits(bs, 8); | ||
| 849 : | |||
| 850 : | if (level == 0 || level == 128) | ||
| 851 : | edgomez | 514 | DPRINTF(DPRINTF_ERROR, "Illegal LEVEL for ESCAPE mode 4: %d", level); |
| 852 : | edgomez | 453 | |
| 853 : | edgomez | 764 | return (level << 24) >> 24; |
| 854 : | edgomez | 453 | } |
| 855 : | |||
| 856 : | mode = BitstreamShowBits(bs, 2); | ||
| 857 : | |||
| 858 : | if (mode < 3) { | ||
| 859 : | BitstreamSkip(bs, (mode == 2) ? 2 : 1); | ||
| 860 : | |||
| 861 : | edgomez | 764 | reverse_event = &DCT3D[intra][BitstreamShowBits(bs, 12)]; |
| 862 : | |||
| 863 : | if ((level = reverse_event->event.level) == 0) | ||
| 864 : | edgomez | 453 | goto error; |
| 865 : | |||
| 866 : | edgomez | 764 | *last = reverse_event->event.last; |
| 867 : | *run = reverse_event->event.run; | ||
| 868 : | edgomez | 453 | |
| 869 : | edgomez | 764 | BitstreamSkip(bs, reverse_event->len); |
| 870 : | edgomez | 453 | |
| 871 : | edgomez | 677 | if (mode < 2) /* first escape mode, level is offset */ |
| 872 : | edgomez | 764 | level += max_level[intra][*last][*run]; |
| 873 : | else /* second escape mode, run is offset */ | ||
| 874 : | *run += max_run[intra][*last][level] + 1; | ||
| 875 : | edgomez | 453 | |
| 876 : | edgomez | 764 | return BitstreamGetBits(bs, 1) ? -level : level; |
| 877 : | edgomez | 453 | } |
| 878 : | edgomez | 764 | |
| 879 : | edgomez | 677 | /* third escape mode - fixed length codes */ |
| 880 : | edgomez | 453 | BitstreamSkip(bs, 2); |
| 881 : | *last = BitstreamGetBits(bs, 1); | ||
| 882 : | *run = BitstreamGetBits(bs, 6); | ||
| 883 : | edgomez | 677 | BitstreamSkip(bs, 1); /* marker */ |
| 884 : | edgomez | 453 | level = BitstreamGetBits(bs, 12); |
| 885 : | edgomez | 677 | BitstreamSkip(bs, 1); /* marker */ |
| 886 : | edgomez | 453 | |
| 887 : | edgomez | 764 | return (level << 20) >> 20; |
| 888 : | edgomez | 453 | |
| 889 : | error: | ||
| 890 : | *run = VLC_ERROR; | ||
| 891 : | return 0; | ||
| 892 : | } | ||
| 893 : | |||
| 894 : | /***************************************************************************** | ||
| 895 : | * MB reading functions | ||
| 896 : | ****************************************************************************/ | ||
| 897 : | |||
| 898 : | edgomez | 195 | void |
| 899 : | get_intra_block(Bitstream * bs, | ||
| 900 : | int16_t * block, | ||
| 901 : | int direction, | ||
| 902 : | int coeff) | ||
| 903 : | Isibaar | 3 | { |
| 904 : | edgomez | 78 | |
| 905 : | edgomez | 195 | const uint16_t *scan = scan_tables[direction]; |
| 906 : | Isibaar | 3 | int level; |
| 907 : | int run; | ||
| 908 : | int last; | ||
| 909 : | |||
| 910 : | edgomez | 195 | do { |
| 911 : | Isibaar | 3 | level = get_coeff(bs, &run, &last, 1, 0); |
| 912 : | edgomez | 195 | if (run == -1) { |
| 913 : | edgomez | 514 | DPRINTF(DPRINTF_DEBUG, "fatal: invalid run"); |
| 914 : | Isibaar | 3 | break; |
| 915 : | } | ||
| 916 : | coeff += run; | ||
| 917 : | edgomez | 195 | block[scan[coeff]] = level; |
| 918 : | suxen_drol | 252 | |
| 919 : | DPRINTF(DPRINTF_COEFF,"block[%i] %i", scan[coeff], level); | ||
| 920 : | edgomez | 677 | /*DPRINTF(DPRINTF_COEFF,"block[%i] %i %08x", scan[coeff], level, BitstreamShowBits(bs, 32)); */ |
| 921 : | suxen_drol | 252 | |
| 922 : | suxen_drol | 759 | if (level < -2047 || level > 2047) { |
| 923 : | edgomez | 514 | DPRINTF(DPRINTF_DEBUG, "warning: intra_overflow: %d", level); |
| 924 : | Isibaar | 3 | } |
| 925 : | coeff++; | ||
| 926 : | } while (!last); | ||
| 927 : | edgomez | 78 | |
| 928 : | Isibaar | 3 | } |
| 929 : | |||
| 930 : | edgomez | 195 | void |
| 931 : | get_inter_block(Bitstream * bs, | ||
| 932 : | int16_t * block) | ||
| 933 : | Isibaar | 3 | { |
| 934 : | edgomez | 78 | |
| 935 : | edgomez | 195 | const uint16_t *scan = scan_tables[0]; |
| 936 : | Isibaar | 3 | int p; |
| 937 : | int level; | ||
| 938 : | int run; | ||
| 939 : | int last; | ||
| 940 : | |||
| 941 : | p = 0; | ||
| 942 : | edgomez | 195 | do { |
| 943 : | Isibaar | 3 | level = get_coeff(bs, &run, &last, 0, 0); |
| 944 : | edgomez | 195 | if (run == -1) { |
| 945 : | edgomez | 514 | DPRINTF(DPRINTF_ERROR, "fatal: invalid run"); |
| 946 : | Isibaar | 3 | break; |
| 947 : | } | ||
| 948 : | p += run; | ||
| 949 : | chenm001 | 161 | |
| 950 : | edgomez | 195 | block[scan[p]] = level; |
| 951 : | suxen_drol | 252 | |
| 952 : | DPRINTF(DPRINTF_COEFF,"block[%i] %i", scan[p], level); | ||
| 953 : | |||
| 954 : | suxen_drol | 759 | if (level < -2047 || level > 2047) { |
| 955 : | edgomez | 514 | DPRINTF(DPRINTF_DEBUG, "warning: inter_overflow: %d", level); |
| 956 : | Isibaar | 3 | } |
| 957 : | p++; | ||
| 958 : | } while (!last); | ||
| 959 : | edgomez | 78 | |
| 960 : | Isibaar | 3 | } |
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