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| 1 : | Isibaar | 3 | /****************************************************************************** |
| 2 : | * * | ||
| 3 : | * This file is part of XviD, a free MPEG-4 video encoder/decoder * | ||
| 4 : | * * | ||
| 5 : | * XviD is an implementation of a part of one or more MPEG-4 Video tools * | ||
| 6 : | * as specified in ISO/IEC 14496-2 standard. Those intending to use this * | ||
| 7 : | * software module in hardware or software products are advised that its * | ||
| 8 : | * use may infringe existing patents or copyrights, and any such use * | ||
| 9 : | * would be at such party's own risk. The original developer of this * | ||
| 10 : | * software module and his/her company, and subsequent editors and their * | ||
| 11 : | * companies, will have no liability for use of this software or * | ||
| 12 : | * modifications or derivatives thereof. * | ||
| 13 : | * * | ||
| 14 : | * XviD is free software; you can redistribute it and/or modify it * | ||
| 15 : | * under the terms of the GNU General Public License as published by * | ||
| 16 : | * the Free Software Foundation; either version 2 of the License, or * | ||
| 17 : | * (at your option) any later version. * | ||
| 18 : | * * | ||
| 19 : | * XviD is distributed in the hope that it will be useful, but * | ||
| 20 : | * WITHOUT ANY WARRANTY; without even the implied warranty of * | ||
| 21 : | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * | ||
| 22 : | * GNU General Public License for more details. * | ||
| 23 : | * * | ||
| 24 : | * You should have received a copy of the GNU General Public License * | ||
| 25 : | * along with this program; if not, write to the Free Software * | ||
| 26 : | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * | ||
| 27 : | * * | ||
| 28 : | ******************************************************************************/ | ||
| 29 : | |||
| 30 : | /****************************************************************************** | ||
| 31 : | * * | ||
| 32 : | * mbprediction.c * | ||
| 33 : | * * | ||
| 34 : | * Copyright (C) 2001 - Michael Militzer <isibaar@xvid.org> * | ||
| 35 : | * Copyright (C) 2001 - Peter Ross <pross@cs.rmit.edu.au> * | ||
| 36 : | * * | ||
| 37 : | * For more information visit the XviD homepage: http://www.xvid.org * | ||
| 38 : | * * | ||
| 39 : | ******************************************************************************/ | ||
| 40 : | |||
| 41 : | /****************************************************************************** | ||
| 42 : | * * | ||
| 43 : | * Revision history: * | ||
| 44 : | * * | ||
| 45 : | * 12.12.2001 improved calc_acdc_prediction; removed need for memcpy * | ||
| 46 : | * 15.12.2001 moved pmv displacement to motion estimation * | ||
| 47 : | * 30.11.2001 mmx cbp support * | ||
| 48 : | * 17.11.2001 initial version * | ||
| 49 : | * * | ||
| 50 : | ******************************************************************************/ | ||
| 51 : | |||
| 52 : | #include "../encoder.h" | ||
| 53 : | #include "mbprediction.h" | ||
| 54 : | #include "../utils/mbfunctions.h" | ||
| 55 : | #include "../bitstream/cbp.h" | ||
| 56 : | |||
| 57 : | |||
| 58 : | #define ABS(X) (((X)>0)?(X):-(X)) | ||
| 59 : | #define DIV_DIV(A,B) ( (A) > 0 ? ((A)+((B)>>1))/(B) : ((A)-((B)>>1))/(B) ) | ||
| 60 : | |||
| 61 : | |||
| 62 : | static int __inline rescale(int predict_quant, int current_quant, int coeff) | ||
| 63 : | { | ||
| 64 : | return (coeff != 0) ? DIV_DIV((coeff) * (predict_quant), (current_quant)) : 0; | ||
| 65 : | } | ||
| 66 : | |||
| 67 : | |||
| 68 : | static const int16_t default_acdc_values[15] = { | ||
| 69 : | 1024, | ||
| 70 : | edgomez | 78 | 0, 0, 0, 0, 0, 0, 0, |
| 71 : | 0, 0, 0, 0, 0, 0, 0 | ||
| 72 : | Isibaar | 3 | }; |
| 73 : | |||
| 74 : | |||
| 75 : | /* get dc/ac prediction direction for a single block and place | ||
| 76 : | predictor values into MB->pred_values[j][..] | ||
| 77 : | */ | ||
| 78 : | |||
| 79 : | |||
| 80 : | void predict_acdc(MACROBLOCK *pMBs, | ||
| 81 : | edgomez | 78 | uint32_t x, uint32_t y, uint32_t mb_width, |
| 82 : | uint32_t block, | ||
| 83 : | int16_t qcoeff[64], | ||
| 84 : | uint32_t current_quant, | ||
| 85 : | int32_t iDcScaler, | ||
| 86 : | int16_t predictors[8]) | ||
| 87 : | Isibaar | 3 | { |
| 88 : | edgomez | 78 | int16_t *left, *top, *diag, *current; |
| 89 : | Isibaar | 3 | |
| 90 : | edgomez | 78 | int32_t left_quant = current_quant; |
| 91 : | int32_t top_quant = current_quant; | ||
| 92 : | Isibaar | 3 | |
| 93 : | edgomez | 78 | const int16_t *pLeft = default_acdc_values; |
| 94 : | const int16_t *pTop = default_acdc_values; | ||
| 95 : | const int16_t *pDiag = default_acdc_values; | ||
| 96 : | Isibaar | 3 | |
| 97 : | edgomez | 78 | uint32_t index = x + y * mb_width; // current macroblock |
| 98 : | int * acpred_direction = &pMBs[index].acpred_directions[block]; | ||
| 99 : | Isibaar | 3 | uint32_t i; |
| 100 : | |||
| 101 : | left = top = diag = current = 0; | ||
| 102 : | |||
| 103 : | // grab left,top and diag macroblocks | ||
| 104 : | |||
| 105 : | // left macroblock | ||
| 106 : | |||
| 107 : | edgomez | 78 | if(x && (pMBs[index - 1].mode == MODE_INTRA |
| 108 : | || pMBs[index - 1].mode == MODE_INTRA_Q)) { | ||
| 109 : | Isibaar | 3 | |
| 110 : | left = pMBs[index - 1].pred_values[0]; | ||
| 111 : | left_quant = pMBs[index - 1].quant; | ||
| 112 : | //DEBUGI("LEFT", *(left+MBPRED_SIZE)); | ||
| 113 : | } | ||
| 114 : | |||
| 115 : | // top macroblock | ||
| 116 : | |||
| 117 : | if(y && (pMBs[index - mb_width].mode == MODE_INTRA | ||
| 118 : | edgomez | 78 | || pMBs[index - mb_width].mode == MODE_INTRA_Q)) { |
| 119 : | Isibaar | 3 | |
| 120 : | top = pMBs[index - mb_width].pred_values[0]; | ||
| 121 : | top_quant = pMBs[index - mb_width].quant; | ||
| 122 : | edgomez | 78 | } |
| 123 : | Isibaar | 3 | |
| 124 : | // diag macroblock | ||
| 125 : | |||
| 126 : | if(x && y && (pMBs[index - 1 - mb_width].mode == MODE_INTRA | ||
| 127 : | edgomez | 78 | || pMBs[index - 1 - mb_width].mode == MODE_INTRA_Q)) { |
| 128 : | Isibaar | 3 | |
| 129 : | diag = pMBs[index - 1 - mb_width].pred_values[0]; | ||
| 130 : | } | ||
| 131 : | |||
| 132 : | edgomez | 78 | current = pMBs[index].pred_values[0]; |
| 133 : | Isibaar | 3 | |
| 134 : | // now grab pLeft, pTop, pDiag _blocks_ | ||
| 135 : | |||
| 136 : | switch (block) { | ||
| 137 : | |||
| 138 : | case 0: | ||
| 139 : | if(left) | ||
| 140 : | pLeft = left + MBPRED_SIZE; | ||
| 141 : | |||
| 142 : | if(top) | ||
| 143 : | pTop = top + (MBPRED_SIZE << 1); | ||
| 144 : | |||
| 145 : | if(diag) | ||
| 146 : | pDiag = diag + 3 * MBPRED_SIZE; | ||
| 147 : | |||
| 148 : | break; | ||
| 149 : | |||
| 150 : | case 1: | ||
| 151 : | pLeft = current; | ||
| 152 : | left_quant = current_quant; | ||
| 153 : | |||
| 154 : | if(top) { | ||
| 155 : | pTop = top + 3 * MBPRED_SIZE; | ||
| 156 : | pDiag = top + (MBPRED_SIZE << 1); | ||
| 157 : | } | ||
| 158 : | break; | ||
| 159 : | |||
| 160 : | case 2: | ||
| 161 : | if(left) { | ||
| 162 : | pLeft = left + 3 * MBPRED_SIZE; | ||
| 163 : | pDiag = left + MBPRED_SIZE; | ||
| 164 : | } | ||
| 165 : | |||
| 166 : | pTop = current; | ||
| 167 : | top_quant = current_quant; | ||
| 168 : | |||
| 169 : | break; | ||
| 170 : | |||
| 171 : | case 3: | ||
| 172 : | pLeft = current + (MBPRED_SIZE << 1); | ||
| 173 : | left_quant = current_quant; | ||
| 174 : | |||
| 175 : | pTop = current + MBPRED_SIZE; | ||
| 176 : | top_quant = current_quant; | ||
| 177 : | |||
| 178 : | pDiag = current; | ||
| 179 : | |||
| 180 : | break; | ||
| 181 : | |||
| 182 : | case 4: | ||
| 183 : | if(left) | ||
| 184 : | pLeft = left + (MBPRED_SIZE << 2); | ||
| 185 : | if(top) | ||
| 186 : | pTop = top + (MBPRED_SIZE << 2); | ||
| 187 : | if(diag) | ||
| 188 : | pDiag = diag + (MBPRED_SIZE << 2); | ||
| 189 : | break; | ||
| 190 : | |||
| 191 : | case 5: | ||
| 192 : | if(left) | ||
| 193 : | pLeft = left + 5 * MBPRED_SIZE; | ||
| 194 : | if(top) | ||
| 195 : | pTop = top + 5 * MBPRED_SIZE; | ||
| 196 : | if(diag) | ||
| 197 : | pDiag = diag + 5 * MBPRED_SIZE; | ||
| 198 : | break; | ||
| 199 : | } | ||
| 200 : | |||
| 201 : | edgomez | 78 | // determine ac prediction direction & ac/dc predictor |
| 202 : | Isibaar | 3 | // place rescaled ac/dc predictions into predictors[] for later use |
| 203 : | |||
| 204 : | edgomez | 78 | if(ABS(pLeft[0] - pDiag[0]) < ABS(pDiag[0] - pTop[0])) { |
| 205 : | Isibaar | 3 | *acpred_direction = 1; // vertical |
| 206 : | predictors[0] = DIV_DIV(pTop[0], iDcScaler); | ||
| 207 : | for (i = 1; i < 8; i++) | ||
| 208 : | { | ||
| 209 : | predictors[i] = rescale(top_quant, current_quant, pTop[i]); | ||
| 210 : | } | ||
| 211 : | } | ||
| 212 : | else | ||
| 213 : | { | ||
| 214 : | *acpred_direction = 2; // horizontal | ||
| 215 : | predictors[0] = DIV_DIV(pLeft[0], iDcScaler); | ||
| 216 : | for (i = 1; i < 8; i++) | ||
| 217 : | { | ||
| 218 : | predictors[i] = rescale(left_quant, current_quant, pLeft[i + 7]); | ||
| 219 : | } | ||
| 220 : | } | ||
| 221 : | } | ||
| 222 : | |||
| 223 : | |||
| 224 : | /* decoder: add predictors to dct_codes[] and | ||
| 225 : | store current coeffs to pred_values[] for future prediction | ||
| 226 : | */ | ||
| 227 : | |||
| 228 : | |||
| 229 : | void add_acdc(MACROBLOCK *pMB, | ||
| 230 : | edgomez | 78 | uint32_t block, |
| 231 : | int16_t dct_codes[64], | ||
| 232 : | uint32_t iDcScaler, | ||
| 233 : | int16_t predictors[8]) | ||
| 234 : | Isibaar | 3 | { |
| 235 : | uint8_t acpred_direction = pMB->acpred_directions[block]; | ||
| 236 : | int16_t * pCurrent = pMB->pred_values[block]; | ||
| 237 : | uint32_t i; | ||
| 238 : | |||
| 239 : | dct_codes[0] += predictors[0]; // dc prediction | ||
| 240 : | pCurrent[0] = dct_codes[0] * iDcScaler; | ||
| 241 : | |||
| 242 : | if (acpred_direction == 1) | ||
| 243 : | { | ||
| 244 : | for (i = 1; i < 8; i++) | ||
| 245 : | { | ||
| 246 : | int level = dct_codes[i] + predictors[i]; | ||
| 247 : | dct_codes[i] = level; | ||
| 248 : | pCurrent[i] = level; | ||
| 249 : | pCurrent[i+7] = dct_codes[i*8]; | ||
| 250 : | } | ||
| 251 : | } | ||
| 252 : | else if (acpred_direction == 2) | ||
| 253 : | { | ||
| 254 : | for (i = 1; i < 8; i++) | ||
| 255 : | { | ||
| 256 : | int level = dct_codes[i*8] + predictors[i]; | ||
| 257 : | dct_codes[i*8] = level; | ||
| 258 : | pCurrent[i+7] = level; | ||
| 259 : | pCurrent[i] = dct_codes[i]; | ||
| 260 : | } | ||
| 261 : | } | ||
| 262 : | else | ||
| 263 : | { | ||
| 264 : | for (i = 1; i < 8; i++) | ||
| 265 : | { | ||
| 266 : | pCurrent[i] = dct_codes[i]; | ||
| 267 : | pCurrent[i+7] = dct_codes[i*8]; | ||
| 268 : | } | ||
| 269 : | } | ||
| 270 : | } | ||
| 271 : | |||
| 272 : | |||
| 273 : | |||
| 274 : | // ****************************************************************** | ||
| 275 : | // ****************************************************************** | ||
| 276 : | |||
| 277 : | /* encoder: subtract predictors from qcoeff[] and calculate S1/S2 | ||
| 278 : | |||
| 279 : | edgomez | 78 | todo: perform [-127,127] clamping after prediction |
| 280 : | clamping must adjust the coeffs, so dequant is done correctly | ||
| 281 : | Isibaar | 3 | |
| 282 : | edgomez | 78 | S1/S2 are used to determine if its worth predicting for AC |
| 283 : | S1 = sum of all (qcoeff - prediction) | ||
| 284 : | S2 = sum of all qcoeff | ||
| 285 : | */ | ||
| 286 : | Isibaar | 3 | |
| 287 : | uint32_t calc_acdc(MACROBLOCK *pMB, | ||
| 288 : | edgomez | 78 | uint32_t block, |
| 289 : | int16_t qcoeff[64], | ||
| 290 : | uint32_t iDcScaler, | ||
| 291 : | int16_t predictors[8]) | ||
| 292 : | Isibaar | 3 | { |
| 293 : | int16_t * pCurrent = pMB->pred_values[block]; | ||
| 294 : | uint32_t i; | ||
| 295 : | uint32_t S1 = 0, S2 = 0; | ||
| 296 : | |||
| 297 : | |||
| 298 : | /* store current coeffs to pred_values[] for future prediction */ | ||
| 299 : | |||
| 300 : | pCurrent[0] = qcoeff[0] * iDcScaler; | ||
| 301 : | for(i = 1; i < 8; i++) { | ||
| 302 : | pCurrent[i] = qcoeff[i]; | ||
| 303 : | pCurrent[i + 7] = qcoeff[i * 8]; | ||
| 304 : | edgomez | 78 | } |
| 305 : | Isibaar | 3 | |
| 306 : | /* subtract predictors and store back in predictors[] */ | ||
| 307 : | |||
| 308 : | qcoeff[0] = qcoeff[0] - predictors[0]; | ||
| 309 : | |||
| 310 : | if (pMB->acpred_directions[block] == 1) | ||
| 311 : | { | ||
| 312 : | for(i = 1; i < 8; i++) { | ||
| 313 : | int16_t level; | ||
| 314 : | |||
| 315 : | level = qcoeff[i]; | ||
| 316 : | S2 += ABS(level); | ||
| 317 : | level -= predictors[i]; | ||
| 318 : | S1 += ABS(level); | ||
| 319 : | predictors[i] = level; | ||
| 320 : | } | ||
| 321 : | } | ||
| 322 : | edgomez | 78 | else // acpred_direction == 2 |
| 323 : | Isibaar | 3 | { |
| 324 : | for(i = 1; i < 8; i++) { | ||
| 325 : | int16_t level; | ||
| 326 : | |||
| 327 : | level = qcoeff[i*8]; | ||
| 328 : | S2 += ABS(level); | ||
| 329 : | level -= predictors[i]; | ||
| 330 : | S1 += ABS(level); | ||
| 331 : | predictors[i] = level; | ||
| 332 : | } | ||
| 333 : | |||
| 334 : | edgomez | 78 | } |
| 335 : | Isibaar | 3 | |
| 336 : | |||
| 337 : | edgomez | 78 | return S2 - S1; |
| 338 : | Isibaar | 3 | } |
| 339 : | |||
| 340 : | |||
| 341 : | /* apply predictors[] to qcoeff */ | ||
| 342 : | |||
| 343 : | void apply_acdc(MACROBLOCK *pMB, | ||
| 344 : | edgomez | 78 | uint32_t block, |
| 345 : | int16_t qcoeff[64], | ||
| 346 : | int16_t predictors[8]) | ||
| 347 : | Isibaar | 3 | { |
| 348 : | uint32_t i; | ||
| 349 : | |||
| 350 : | if (pMB->acpred_directions[block] == 1) | ||
| 351 : | { | ||
| 352 : | for(i = 1; i < 8; i++) | ||
| 353 : | { | ||
| 354 : | qcoeff[i] = predictors[i]; | ||
| 355 : | } | ||
| 356 : | } | ||
| 357 : | edgomez | 78 | else |
| 358 : | Isibaar | 3 | { |
| 359 : | for(i = 1; i < 8; i++) | ||
| 360 : | { | ||
| 361 : | qcoeff[i*8] = predictors[i]; | ||
| 362 : | } | ||
| 363 : | edgomez | 78 | } |
| 364 : | Isibaar | 3 | } |
| 365 : | |||
| 366 : | |||
| 367 : | edgomez | 78 | void MBPrediction(MBParam *pParam, |
| 368 : | uint32_t x, | ||
| 369 : | uint32_t y, | ||
| 370 : | uint32_t mb_width, | ||
| 371 : | int16_t qcoeff[6*64], | ||
| 372 : | MACROBLOCK *mbs) | ||
| 373 : | Isibaar | 3 | { |
| 374 : | edgomez | 78 | |
| 375 : | int32_t j; | ||
| 376 : | Isibaar | 3 | int32_t iDcScaler, iQuant = pParam->quant; |
| 377 : | int32_t S = 0; | ||
| 378 : | int16_t predictors[6][8]; | ||
| 379 : | |||
| 380 : | edgomez | 78 | MACROBLOCK *pMB = &mbs[x + y * mb_width]; |
| 381 : | Isibaar | 3 | |
| 382 : | edgomez | 78 | if ((pMB->mode == MODE_INTRA) || (pMB->mode == MODE_INTRA_Q)) { |
| 383 : | Isibaar | 3 | |
| 384 : | for(j = 0; j < 6; j++) | ||
| 385 : | { | ||
| 386 : | iDcScaler = get_dc_scaler(iQuant, (j < 4) ? 1 : 0); | ||
| 387 : | |||
| 388 : | edgomez | 78 | predict_acdc(mbs, |
| 389 : | x, | ||
| 390 : | y, | ||
| 391 : | mb_width, | ||
| 392 : | j, | ||
| 393 : | &qcoeff[j*64], | ||
| 394 : | iQuant, | ||
| 395 : | iDcScaler, | ||
| 396 : | predictors[j]); | ||
| 397 : | |||
| 398 : | S += calc_acdc(pMB, | ||
| 399 : | j, | ||
| 400 : | &qcoeff[j*64], | ||
| 401 : | iDcScaler, | ||
| 402 : | predictors[j]); | ||
| 403 : | |||
| 404 : | Isibaar | 3 | } |
| 405 : | |||
| 406 : | if (S < 0) // dont predict | ||
| 407 : | { | ||
| 408 : | for(j = 0; j < 6; j++) | ||
| 409 : | { | ||
| 410 : | pMB->acpred_directions[j] = 0; | ||
| 411 : | } | ||
| 412 : | } | ||
| 413 : | else | ||
| 414 : | { | ||
| 415 : | for(j = 0; j < 6; j++) | ||
| 416 : | { | ||
| 417 : | edgomez | 78 | apply_acdc(pMB, j, &qcoeff[j*64], predictors[j]); |
| 418 : | Isibaar | 3 | } |
| 419 : | } | ||
| 420 : | pMB->cbp = calc_cbp(qcoeff); | ||
| 421 : | } | ||
| 422 : | edgomez | 78 | |
| 423 : | Isibaar | 3 | } |
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