1 /* ------------------------------------------------------------------ 2 * Copyright (C) 1998-2009 PacketVideo 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 13 * express or implied. 14 * See the License for the specific language governing permissions 15 * and limitations under the License. 16 * ------------------------------------------------------------------- 17 */ 18 /* Note for optimization: syntax decoding or operations related to B_SLICE should be 19 commented out by macro definition or function pointers. */ 20 21 #include <string.h> 22 23 #include "avcdec_lib.h" 24 #include "avcdec_bitstream.h" 25 26 const static int mbPart2raster[3][4] = {{0, 0, 0, 0}, {1, 1, 0, 0}, {1, 0, 1, 0}}; 27 /* decode_frame_slice() */ 28 /* decode_one_slice() */ 29 AVCDec_Status DecodeSlice(AVCDecObject *decvid) 30 { 31 AVCDec_Status status; 32 AVCCommonObj *video = decvid->common; 33 AVCSliceHeader *sliceHdr = video->sliceHdr; 34 AVCMacroblock *currMB ; 35 AVCDecBitstream *stream = decvid->bitstream; 36 uint slice_group_id; 37 uint CurrMbAddr, moreDataFlag; 38 39 /* set the first mb in slice */ 40 CurrMbAddr = sliceHdr->first_mb_in_slice; 41 slice_group_id = video->MbToSliceGroupMap[CurrMbAddr]; 42 43 if ((CurrMbAddr && (CurrMbAddr != (uint)(video->mbNum + 1))) && video->currSeqParams->constrained_set1_flag == 1) 44 { 45 ConcealSlice(decvid, video->mbNum, CurrMbAddr); 46 } 47 48 moreDataFlag = 1; 49 video->mb_skip_run = -1; 50 51 52 /* while loop , see subclause 7.3.4 */ 53 do 54 { 55 if (CurrMbAddr >= video->PicSizeInMbs) 56 { 57 return AVCDEC_FAIL; 58 } 59 60 currMB = video->currMB = &(video->mblock[CurrMbAddr]); 61 video->mbNum = CurrMbAddr; 62 currMB->slice_id = video->slice_id; // slice 63 64 /* we can remove this check if we don't support Mbaff. */ 65 /* we can wrap below into an initMB() function which will also 66 do necessary reset of macroblock related parameters. */ 67 68 video->mb_x = CurrMbAddr % video->PicWidthInMbs; 69 video->mb_y = CurrMbAddr / video->PicWidthInMbs; 70 71 /* check the availability of neighboring macroblocks */ 72 InitNeighborAvailability(video, CurrMbAddr); 73 74 /* read_macroblock and decode_one_macroblock() */ 75 status = DecodeMB(decvid); 76 if (status != AVCDEC_SUCCESS) 77 { 78 return status; 79 } 80 #ifdef MB_BASED_DEBLOCK 81 if (video->currPicParams->num_slice_groups_minus1 == 0) 82 { 83 MBInLoopDeblock(video); /* MB-based deblocking */ 84 } 85 else /* this mode cannot be used if the number of slice group is not one. */ 86 { 87 return AVCDEC_FAIL; 88 } 89 #endif 90 video->numMBs--; 91 92 moreDataFlag = more_rbsp_data(stream); 93 94 95 /* go to next MB */ 96 while (++CurrMbAddr < video->PicSizeInMbs && video->MbToSliceGroupMap[CurrMbAddr] != (int)slice_group_id) 97 { 98 } 99 100 } 101 while ((moreDataFlag && video->numMBs > 0) || video->mb_skip_run > 0); /* even if no more data, but last few MBs are skipped */ 102 103 if (video->numMBs == 0) 104 { 105 video->newPic = TRUE; 106 video->mbNum = 0; // _Conceal 107 return AVCDEC_PICTURE_READY; 108 } 109 110 return AVCDEC_SUCCESS; 111 } 112 113 /* read MB mode and motion vectors */ 114 /* perform Intra/Inter prediction and residue */ 115 /* update video->mb_skip_run */ 116 AVCDec_Status DecodeMB(AVCDecObject *decvid) 117 { 118 AVCDec_Status status; 119 AVCCommonObj *video = decvid->common; 120 AVCDecBitstream *stream = decvid->bitstream; 121 AVCMacroblock *currMB = video->currMB; 122 uint mb_type; 123 int slice_type = video->slice_type; 124 int temp; 125 126 currMB->QPy = video->QPy; 127 currMB->QPc = video->QPc; 128 129 if (slice_type == AVC_P_SLICE) 130 { 131 if (video->mb_skip_run < 0) 132 { 133 ue_v(stream, (uint *)&(video->mb_skip_run)); 134 } 135 136 if (video->mb_skip_run == 0) 137 { 138 /* this will not handle the case where the slice ends with a mb_skip_run == 0 and no following MB data */ 139 ue_v(stream, &mb_type); 140 if (mb_type > 30) 141 { 142 return AVCDEC_FAIL; 143 } 144 InterpretMBModeP(currMB, mb_type); 145 video->mb_skip_run = -1; 146 } 147 else 148 { 149 /* see subclause 7.4.4 for more details on how 150 mb_field_decoding_flag is derived in case of skipped MB */ 151 152 currMB->mb_intra = FALSE; 153 154 currMB->mbMode = AVC_SKIP; 155 currMB->MbPartWidth = currMB->MbPartHeight = 16; 156 currMB->NumMbPart = 1; 157 currMB->NumSubMbPart[0] = currMB->NumSubMbPart[1] = 158 currMB->NumSubMbPart[2] = currMB->NumSubMbPart[3] = 1; // 159 currMB->SubMbPartWidth[0] = currMB->SubMbPartWidth[1] = 160 currMB->SubMbPartWidth[2] = currMB->SubMbPartWidth[3] = currMB->MbPartWidth; 161 currMB->SubMbPartHeight[0] = currMB->SubMbPartHeight[1] = 162 currMB->SubMbPartHeight[2] = currMB->SubMbPartHeight[3] = currMB->MbPartHeight; 163 164 memset(currMB->nz_coeff, 0, sizeof(uint8)*NUM_BLKS_IN_MB); 165 166 currMB->CBP = 0; 167 video->cbp4x4 = 0; 168 /* for skipped MB, always look at the first entry in RefPicList */ 169 currMB->RefIdx[0] = currMB->RefIdx[1] = 170 currMB->RefIdx[2] = currMB->RefIdx[3] = video->RefPicList0[0]->RefIdx; 171 InterMBPrediction(video); 172 video->mb_skip_run--; 173 return AVCDEC_SUCCESS; 174 } 175 176 } 177 else 178 { 179 /* Then decode mode and MV */ 180 ue_v(stream, &mb_type); 181 if (mb_type > 25) 182 { 183 return AVCDEC_FAIL; 184 } 185 InterpretMBModeI(currMB, mb_type); 186 } 187 188 189 if (currMB->mbMode != AVC_I_PCM) 190 { 191 192 if (currMB->mbMode == AVC_P8 || currMB->mbMode == AVC_P8ref0) 193 { 194 status = sub_mb_pred(video, currMB, stream); 195 } 196 else 197 { 198 status = mb_pred(video, currMB, stream) ; 199 } 200 201 if (status != AVCDEC_SUCCESS) 202 { 203 return status; 204 } 205 206 if (currMB->mbMode != AVC_I16) 207 { 208 /* decode coded_block_pattern */ 209 status = DecodeCBP(currMB, stream); 210 if (status != AVCDEC_SUCCESS) 211 { 212 return status; 213 } 214 } 215 216 if (currMB->CBP > 0 || currMB->mbMode == AVC_I16) 217 { 218 se_v(stream, &temp); 219 if (temp) 220 { 221 temp += (video->QPy + 52); 222 currMB->QPy = video->QPy = temp - 52 * (temp * 79 >> 12); 223 if (currMB->QPy > 51 || currMB->QPy < 0) 224 { 225 video->QPy = AVC_CLIP3(0, 51, video->QPy); 226 // return AVCDEC_FAIL; 227 } 228 video->QPy_div_6 = (video->QPy * 43) >> 8; 229 video->QPy_mod_6 = video->QPy - 6 * video->QPy_div_6; 230 currMB->QPc = video->QPc = mapQPi2QPc[AVC_CLIP3(0, 51, video->QPy + video->currPicParams->chroma_qp_index_offset)]; 231 video->QPc_div_6 = (video->QPc * 43) >> 8; 232 video->QPc_mod_6 = video->QPc - 6 * video->QPc_div_6; 233 } 234 } 235 /* decode residue and inverse transform */ 236 status = residual(decvid, currMB); 237 if (status != AVCDEC_SUCCESS) 238 { 239 return status; 240 } 241 } 242 else 243 { 244 if (stream->bitcnt & 7) 245 { 246 BitstreamByteAlign(stream); 247 } 248 /* decode pcm_byte[i] */ 249 DecodeIntraPCM(video, stream); 250 251 currMB->QPy = 0; /* necessary for deblocking */ // _OPTIMIZE 252 currMB->QPc = mapQPi2QPc[AVC_CLIP3(0, 51, video->currPicParams->chroma_qp_index_offset)]; 253 254 /* default values, don't know if really needed */ 255 currMB->CBP = 0x3F; 256 video->cbp4x4 = 0xFFFF; 257 currMB->mb_intra = TRUE; 258 memset(currMB->nz_coeff, 16, sizeof(uint8)*NUM_BLKS_IN_MB); 259 return AVCDEC_SUCCESS; 260 } 261 262 263 /* do Intra/Inter prediction, together with the residue compensation */ 264 /* This part should be common between the skip and no-skip */ 265 if (currMB->mbMode == AVC_I4 || currMB->mbMode == AVC_I16) 266 { 267 IntraMBPrediction(video); 268 } 269 else 270 { 271 InterMBPrediction(video); 272 } 273 274 275 276 return AVCDEC_SUCCESS; 277 } 278 279 /* see subclause 7.3.5.1 */ 280 AVCDec_Status mb_pred(AVCCommonObj *video, AVCMacroblock *currMB, AVCDecBitstream *stream) 281 { 282 int mbPartIdx; 283 AVCSliceHeader *sliceHdr = video->sliceHdr; 284 uint max_ref_idx; 285 const int *temp_0; 286 int16 *temp_1; 287 uint code; 288 289 if (currMB->mbMode == AVC_I4 || currMB->mbMode == AVC_I16) 290 { 291 292 video->intraAvailA = video->intraAvailB = video->intraAvailC = video->intraAvailD = 0; 293 294 if (!video->currPicParams->constrained_intra_pred_flag) 295 { 296 video->intraAvailA = video->mbAvailA; 297 video->intraAvailB = video->mbAvailB; 298 video->intraAvailC = video->mbAvailC; 299 video->intraAvailD = video->mbAvailD; 300 } 301 else 302 { 303 if (video->mbAvailA) 304 { 305 video->intraAvailA = video->mblock[video->mbAddrA].mb_intra; 306 } 307 if (video->mbAvailB) 308 { 309 video->intraAvailB = video->mblock[video->mbAddrB].mb_intra ; 310 } 311 if (video->mbAvailC) 312 { 313 video->intraAvailC = video->mblock[video->mbAddrC].mb_intra; 314 } 315 if (video->mbAvailD) 316 { 317 video->intraAvailD = video->mblock[video->mbAddrD].mb_intra; 318 } 319 } 320 321 322 if (currMB->mbMode == AVC_I4) 323 { 324 /* perform prediction to get the actual intra 4x4 pred mode */ 325 DecodeIntra4x4Mode(video, currMB, stream); 326 /* output will be in currMB->i4Mode[4][4] */ 327 } 328 329 ue_v(stream, &code); 330 331 if (code > 3) 332 { 333 return AVCDEC_FAIL; /* out of range */ 334 } 335 currMB->intra_chroma_pred_mode = (AVCIntraChromaPredMode)code; 336 } 337 else 338 { 339 340 memset(currMB->ref_idx_L0, 0, sizeof(int16)*4); 341 342 /* see subclause 7.4.5.1 for the range of ref_idx_lX */ 343 // max_ref_idx = sliceHdr->num_ref_idx_l0_active_minus1; 344 max_ref_idx = video->refList0Size - 1; 345 346 /* decode ref index for L0 */ 347 if (sliceHdr->num_ref_idx_l0_active_minus1 > 0) 348 { 349 for (mbPartIdx = 0; mbPartIdx < currMB->NumMbPart; mbPartIdx++) 350 { 351 te_v(stream, &code, max_ref_idx); 352 if (code > (uint)max_ref_idx) 353 { 354 return AVCDEC_FAIL; 355 } 356 currMB->ref_idx_L0[mbPartIdx] = code; 357 } 358 } 359 360 /* populate ref_idx_L0 */ 361 temp_0 = &mbPart2raster[currMB->mbMode-AVC_P16][0]; 362 temp_1 = &currMB->ref_idx_L0[3]; 363 364 *temp_1-- = currMB->ref_idx_L0[*temp_0++]; 365 *temp_1-- = currMB->ref_idx_L0[*temp_0++]; 366 *temp_1-- = currMB->ref_idx_L0[*temp_0++]; 367 *temp_1-- = currMB->ref_idx_L0[*temp_0++]; 368 369 /* Global reference index, these values are used in deblock */ 370 currMB->RefIdx[0] = video->RefPicList0[currMB->ref_idx_L0[0]]->RefIdx; 371 currMB->RefIdx[1] = video->RefPicList0[currMB->ref_idx_L0[1]]->RefIdx; 372 currMB->RefIdx[2] = video->RefPicList0[currMB->ref_idx_L0[2]]->RefIdx; 373 currMB->RefIdx[3] = video->RefPicList0[currMB->ref_idx_L0[3]]->RefIdx; 374 375 /* see subclause 7.4.5.1 for the range of ref_idx_lX */ 376 max_ref_idx = sliceHdr->num_ref_idx_l1_active_minus1; 377 /* decode mvd_l0 */ 378 for (mbPartIdx = 0; mbPartIdx < currMB->NumMbPart; mbPartIdx++) 379 { 380 se_v(stream, &(video->mvd_l0[mbPartIdx][0][0])); 381 se_v(stream, &(video->mvd_l0[mbPartIdx][0][1])); 382 } 383 } 384 385 return AVCDEC_SUCCESS; 386 } 387 388 /* see subclause 7.3.5.2 */ 389 AVCDec_Status sub_mb_pred(AVCCommonObj *video, AVCMacroblock *currMB, AVCDecBitstream *stream) 390 { 391 int mbPartIdx, subMbPartIdx; 392 AVCSliceHeader *sliceHdr = video->sliceHdr; 393 uint max_ref_idx; 394 uint sub_mb_type[4]; 395 uint code; 396 397 memset(currMB->ref_idx_L0, 0, sizeof(int16)*4); 398 399 for (mbPartIdx = 0; mbPartIdx < 4; mbPartIdx++) 400 { 401 ue_v(stream, &(sub_mb_type[mbPartIdx])); 402 if (sub_mb_type[mbPartIdx] > 3) 403 { 404 return AVCDEC_FAIL; 405 } 406 407 } 408 /* we have to check the values to make sure they are valid */ 409 /* assign values to currMB->sub_mb_type[], currMB->MBPartPredMode[][x] */ 410 411 InterpretSubMBModeP(currMB, sub_mb_type); 412 413 414 /* see subclause 7.4.5.1 for the range of ref_idx_lX */ 415 // max_ref_idx = sliceHdr->num_ref_idx_l0_active_minus1; 416 max_ref_idx = video->refList0Size - 1; 417 418 if (sliceHdr->num_ref_idx_l0_active_minus1 > 0 && currMB->mbMode != AVC_P8ref0) 419 { 420 for (mbPartIdx = 0; mbPartIdx < 4; mbPartIdx++) 421 { 422 te_v(stream, (uint*)&code, max_ref_idx); 423 if (code > max_ref_idx) 424 { 425 return AVCDEC_FAIL; 426 } 427 currMB->ref_idx_L0[mbPartIdx] = code; 428 } 429 } 430 /* see subclause 7.4.5.1 for the range of ref_idx_lX */ 431 432 max_ref_idx = sliceHdr->num_ref_idx_l1_active_minus1; 433 /* if(video->MbaffFrameFlag && currMB->mb_field_decoding_flag) 434 max_ref_idx = 2*sliceHdr->num_ref_idx_l1_active_minus1 + 1;*/ 435 for (mbPartIdx = 0; mbPartIdx < 4; mbPartIdx++) 436 { 437 for (subMbPartIdx = 0; subMbPartIdx < currMB->NumSubMbPart[mbPartIdx]; subMbPartIdx++) 438 { 439 se_v(stream, &(video->mvd_l0[mbPartIdx][subMbPartIdx][0])); 440 se_v(stream, &(video->mvd_l0[mbPartIdx][subMbPartIdx][1])); 441 } 442 /* used in deblocking */ 443 currMB->RefIdx[mbPartIdx] = video->RefPicList0[currMB->ref_idx_L0[mbPartIdx]]->RefIdx; 444 } 445 return AVCDEC_SUCCESS; 446 } 447 448 void InterpretMBModeI(AVCMacroblock *mblock, uint mb_type) 449 { 450 mblock->NumMbPart = 1; 451 452 mblock->mb_intra = TRUE; 453 454 if (mb_type == 0) /* I_4x4 */ 455 { 456 mblock->mbMode = AVC_I4; 457 } 458 else if (mb_type < 25) /* I_PCM */ 459 { 460 mblock->mbMode = AVC_I16; 461 mblock->i16Mode = (AVCIntra16x16PredMode)((mb_type - 1) & 0x3); 462 if (mb_type > 12) 463 { 464 mblock->CBP = (((mb_type - 13) >> 2) << 4) + 0x0F; 465 } 466 else 467 { 468 mblock->CBP = ((mb_type - 1) >> 2) << 4; 469 } 470 } 471 else 472 { 473 mblock->mbMode = AVC_I_PCM; 474 } 475 476 return ; 477 } 478 479 void InterpretMBModeP(AVCMacroblock *mblock, uint mb_type) 480 { 481 const static int map2PartWidth[5] = {16, 16, 8, 8, 8}; 482 const static int map2PartHeight[5] = {16, 8, 16, 8, 8}; 483 const static int map2NumPart[5] = {1, 2, 2, 4, 4}; 484 const static AVCMBMode map2mbMode[5] = {AVC_P16, AVC_P16x8, AVC_P8x16, AVC_P8, AVC_P8ref0}; 485 486 mblock->mb_intra = FALSE; 487 if (mb_type < 5) 488 { 489 mblock->mbMode = map2mbMode[mb_type]; 490 mblock->MbPartWidth = map2PartWidth[mb_type]; 491 mblock->MbPartHeight = map2PartHeight[mb_type]; 492 mblock->NumMbPart = map2NumPart[mb_type]; 493 mblock->NumSubMbPart[0] = mblock->NumSubMbPart[1] = 494 mblock->NumSubMbPart[2] = mblock->NumSubMbPart[3] = 1; 495 mblock->SubMbPartWidth[0] = mblock->SubMbPartWidth[1] = 496 mblock->SubMbPartWidth[2] = mblock->SubMbPartWidth[3] = mblock->MbPartWidth; 497 mblock->SubMbPartHeight[0] = mblock->SubMbPartHeight[1] = 498 mblock->SubMbPartHeight[2] = mblock->SubMbPartHeight[3] = mblock->MbPartHeight; 499 } 500 else 501 { 502 InterpretMBModeI(mblock, mb_type - 5); 503 /* set MV and Ref_Idx codes of Intra blocks in P-slices */ 504 memset(mblock->mvL0, 0, sizeof(int32)*16); 505 mblock->ref_idx_L0[0] = mblock->ref_idx_L0[1] = mblock->ref_idx_L0[2] = mblock->ref_idx_L0[3] = -1; 506 } 507 return ; 508 } 509 510 void InterpretMBModeB(AVCMacroblock *mblock, uint mb_type) 511 { 512 const static int map2PartWidth[23] = {8, 16, 16, 16, 16, 8, 16, 8, 16, 8, 513 16, 8, 16, 8, 16, 8, 16, 8, 16, 8, 16, 8, 8 514 }; 515 const static int map2PartHeight[23] = {8, 16, 16, 16, 8, 16, 8, 16, 8, 516 16, 8, 16, 8, 16, 8, 16, 8, 16, 8, 16, 8, 16, 8 517 }; 518 /* see enum AVCMBType declaration */ 519 const static AVCMBMode map2mbMode[23] = {AVC_BDirect16, AVC_P16, AVC_P16, AVC_P16, 520 AVC_P16x8, AVC_P8x16, AVC_P16x8, AVC_P8x16, AVC_P16x8, AVC_P8x16, 521 AVC_P16x8, AVC_P8x16, AVC_P16x8, AVC_P8x16, AVC_P16x8, AVC_P8x16, 522 AVC_P16x8, AVC_P8x16, AVC_P16x8, AVC_P8x16, AVC_P16x8, AVC_P8x16, AVC_P8 523 }; 524 const static int map2PredMode1[23] = {3, 0, 1, 2, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 2, 2, 2, 2, 2, 2, -1}; 525 const static int map2PredMode2[23] = { -1, -1, -1, -1, 0, 0, 1, 1, 1, 1, 0, 0, 2, 2, 2, 2, 0, 0, 1, 1, 2, 2, -1}; 526 const static int map2NumPart[23] = { -1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 4}; 527 528 mblock->mb_intra = FALSE; 529 530 if (mb_type < 23) 531 { 532 mblock->mbMode = map2mbMode[mb_type]; 533 mblock->NumMbPart = map2NumPart[mb_type]; 534 mblock->MBPartPredMode[0][0] = (AVCPredMode)map2PredMode1[mb_type]; 535 if (mblock->NumMbPart > 1) 536 { 537 mblock->MBPartPredMode[1][0] = (AVCPredMode)map2PredMode2[mb_type]; 538 } 539 mblock->MbPartWidth = map2PartWidth[mb_type]; 540 mblock->MbPartHeight = map2PartHeight[mb_type]; 541 } 542 else 543 { 544 InterpretMBModeI(mblock, mb_type - 23); 545 } 546 547 return ; 548 } 549 550 void InterpretMBModeSI(AVCMacroblock *mblock, uint mb_type) 551 { 552 mblock->mb_intra = TRUE; 553 554 if (mb_type == 0) 555 { 556 mblock->mbMode = AVC_SI4; 557 /* other values are N/A */ 558 } 559 else 560 { 561 InterpretMBModeI(mblock, mb_type - 1); 562 } 563 return ; 564 } 565 566 /* input is mblock->sub_mb_type[] */ 567 void InterpretSubMBModeP(AVCMacroblock *mblock, uint *sub_mb_type) 568 { 569 int i, sub_type; 570 /* see enum AVCMBType declaration */ 571 // const static AVCSubMBMode map2subMbMode[4] = {AVC_8x8,AVC_8x4,AVC_4x8,AVC_4x4}; 572 const static int map2subPartWidth[4] = {8, 8, 4, 4}; 573 const static int map2subPartHeight[4] = {8, 4, 8, 4}; 574 const static int map2numSubPart[4] = {1, 2, 2, 4}; 575 576 for (i = 0; i < 4 ; i++) 577 { 578 sub_type = (int) sub_mb_type[i]; 579 // mblock->subMbMode[i] = map2subMbMode[sub_type]; 580 mblock->NumSubMbPart[i] = map2numSubPart[sub_type]; 581 mblock->SubMbPartWidth[i] = map2subPartWidth[sub_type]; 582 mblock->SubMbPartHeight[i] = map2subPartHeight[sub_type]; 583 } 584 585 return ; 586 } 587 588 void InterpretSubMBModeB(AVCMacroblock *mblock, uint *sub_mb_type) 589 { 590 int i, j, sub_type; 591 /* see enum AVCMBType declaration */ 592 const static AVCSubMBMode map2subMbMode[13] = {AVC_BDirect8, AVC_8x8, AVC_8x8, 593 AVC_8x8, AVC_8x4, AVC_4x8, AVC_8x4, AVC_4x8, AVC_8x4, AVC_4x8, AVC_4x4, AVC_4x4, AVC_4x4 594 }; 595 const static int map2subPartWidth[13] = {4, 8, 8, 8, 8, 4, 8, 4, 8, 4, 4, 4, 4}; 596 const static int map2subPartHeight[13] = {4, 8, 8, 8, 4, 8, 4, 8, 4, 8, 4, 4, 4}; 597 const static int map2numSubPart[13] = {1, 1, 1, 2, 2, 2, 2, 2, 2, 4, 4, 4}; 598 const static int map2predMode[13] = {3, 0, 1, 2, 0, 0, 1, 1, 2, 2, 0, 1, 2}; 599 600 for (i = 0; i < 4 ; i++) 601 { 602 sub_type = (int) sub_mb_type[i]; 603 mblock->subMbMode[i] = map2subMbMode[sub_type]; 604 mblock->NumSubMbPart[i] = map2numSubPart[sub_type]; 605 mblock->SubMbPartWidth[i] = map2subPartWidth[sub_type]; 606 mblock->SubMbPartHeight[i] = map2subPartHeight[sub_type]; 607 for (j = 0; j < 4; j++) 608 { 609 mblock->MBPartPredMode[i][j] = (AVCPredMode)map2predMode[sub_type]; 610 } 611 } 612 613 return ; 614 } 615 616 /* see subclause 8.3.1 */ 617 AVCDec_Status DecodeIntra4x4Mode(AVCCommonObj *video, AVCMacroblock *currMB, AVCDecBitstream *stream) 618 { 619 int intra4x4PredModeA = 0, intra4x4PredModeB = 0, predIntra4x4PredMode = 0; 620 int component, SubBlock_indx, block_x, block_y; 621 int dcOnlyPredictionFlag; 622 uint prev_intra4x4_pred_mode_flag[16]; 623 int rem_intra4x4_pred_mode[16]; 624 int bindx = 0; 625 626 for (component = 0; component < 4; component++) /* partition index */ 627 { 628 block_x = ((component & 1) << 1); 629 block_y = ((component >> 1) << 1); 630 631 for (SubBlock_indx = 0; SubBlock_indx < 4; SubBlock_indx++) /* sub-partition index */ 632 { 633 BitstreamRead1Bit(stream, &(prev_intra4x4_pred_mode_flag[bindx])); 634 635 if (!prev_intra4x4_pred_mode_flag[bindx]) 636 { 637 BitstreamReadBits(stream, 3, (uint*)&(rem_intra4x4_pred_mode[bindx])); 638 } 639 640 dcOnlyPredictionFlag = 0; 641 if (block_x > 0) 642 { 643 intra4x4PredModeA = currMB->i4Mode[(block_y << 2) + block_x - 1 ]; 644 } 645 else 646 { 647 if (video->intraAvailA) 648 { 649 if (video->mblock[video->mbAddrA].mbMode == AVC_I4) 650 { 651 intra4x4PredModeA = video->mblock[video->mbAddrA].i4Mode[(block_y << 2) + 3]; 652 } 653 else 654 { 655 intra4x4PredModeA = AVC_I4_DC; 656 } 657 } 658 else 659 { 660 dcOnlyPredictionFlag = 1; 661 } 662 } 663 664 if (block_y > 0) 665 { 666 intra4x4PredModeB = currMB->i4Mode[((block_y-1) << 2) + block_x]; 667 } 668 else 669 { 670 if (video->intraAvailB) 671 { 672 if (video->mblock[video->mbAddrB].mbMode == AVC_I4) 673 { 674 intra4x4PredModeB = video->mblock[video->mbAddrB].i4Mode[(3 << 2) + block_x]; 675 } 676 else 677 { 678 intra4x4PredModeB = AVC_I4_DC; 679 } 680 } 681 else 682 { 683 dcOnlyPredictionFlag = 1; 684 } 685 } 686 687 if (dcOnlyPredictionFlag) 688 { 689 intra4x4PredModeA = intra4x4PredModeB = AVC_I4_DC; 690 } 691 692 predIntra4x4PredMode = AVC_MIN(intra4x4PredModeA, intra4x4PredModeB); 693 if (prev_intra4x4_pred_mode_flag[bindx]) 694 { 695 currMB->i4Mode[(block_y<<2)+block_x] = (AVCIntra4x4PredMode)predIntra4x4PredMode; 696 } 697 else 698 { 699 if (rem_intra4x4_pred_mode[bindx] < predIntra4x4PredMode) 700 { 701 currMB->i4Mode[(block_y<<2)+block_x] = (AVCIntra4x4PredMode)rem_intra4x4_pred_mode[bindx]; 702 } 703 else 704 { 705 currMB->i4Mode[(block_y<<2)+block_x] = (AVCIntra4x4PredMode)(rem_intra4x4_pred_mode[bindx] + 1); 706 } 707 } 708 bindx++; 709 block_y += (SubBlock_indx & 1) ; 710 block_x += (1 - 2 * (SubBlock_indx & 1)) ; 711 } 712 } 713 return AVCDEC_SUCCESS; 714 } 715 AVCDec_Status ConcealSlice(AVCDecObject *decvid, int mbnum_start, int mbnum_end) 716 { 717 AVCCommonObj *video = decvid->common; 718 AVCMacroblock *currMB ; 719 720 int CurrMbAddr; 721 722 if (video->RefPicList0[0] == NULL) 723 { 724 return AVCDEC_FAIL; 725 } 726 727 for (CurrMbAddr = mbnum_start; CurrMbAddr < mbnum_end; CurrMbAddr++) 728 { 729 currMB = video->currMB = &(video->mblock[CurrMbAddr]); 730 video->mbNum = CurrMbAddr; 731 currMB->slice_id = video->slice_id++; // slice 732 733 /* we can remove this check if we don't support Mbaff. */ 734 /* we can wrap below into an initMB() function which will also 735 do necessary reset of macroblock related parameters. */ 736 737 video->mb_x = CurrMbAddr % video->PicWidthInMbs; 738 video->mb_y = CurrMbAddr / video->PicWidthInMbs; 739 740 /* check the availability of neighboring macroblocks */ 741 InitNeighborAvailability(video, CurrMbAddr); 742 743 currMB->mb_intra = FALSE; 744 745 currMB->mbMode = AVC_SKIP; 746 currMB->MbPartWidth = currMB->MbPartHeight = 16; 747 748 currMB->NumMbPart = 1; 749 currMB->NumSubMbPart[0] = currMB->NumSubMbPart[1] = 750 currMB->NumSubMbPart[2] = currMB->NumSubMbPart[3] = 1; 751 currMB->SubMbPartWidth[0] = currMB->SubMbPartWidth[1] = 752 currMB->SubMbPartWidth[2] = currMB->SubMbPartWidth[3] = currMB->MbPartWidth; 753 currMB->SubMbPartHeight[0] = currMB->SubMbPartHeight[1] = 754 currMB->SubMbPartHeight[2] = currMB->SubMbPartHeight[3] = currMB->MbPartHeight; 755 currMB->QPy = 26; 756 currMB->QPc = 26; 757 memset(currMB->nz_coeff, 0, sizeof(uint8)*NUM_BLKS_IN_MB); 758 759 currMB->CBP = 0; 760 video->cbp4x4 = 0; 761 /* for skipped MB, always look at the first entry in RefPicList */ 762 currMB->RefIdx[0] = currMB->RefIdx[1] = 763 currMB->RefIdx[2] = currMB->RefIdx[3] = video->RefPicList0[0]->RefIdx; 764 InterMBPrediction(video); 765 766 video->numMBs--; 767 768 } 769 770 return AVCDEC_SUCCESS; 771 } 772 773
