1 ; ********** 2 ; * 3 ; * File Name: omxVCM4P2_DecodePadMV_PVOP_s.s 4 ; * OpenMAX DL: v1.0.2 5 ; * Revision: 9641 6 ; * Date: Thursday, February 7, 2008 7 ; * 8 ; * (c) Copyright 2007-2008 ARM Limited. All Rights Reserved. 9 ; * 10 ; * 11 ; * 12 ; ** 13 ; * Function: omxVCM4P2_DecodePadMV_PVOP 14 ; * 15 ; * Description: 16 ; * Decodes and pads four motion vectors of the non-intra macroblock in P-VOP. 17 ; * The motion vector padding process is specified in subclause 7.6.1.6 of 18 ; * ISO/IEC 14496-2. 19 ; * 20 ; * Remarks: 21 ; * 22 ; * 23 ; * Parameters: 24 ; * [in] ppBitStream pointer to the pointer to the current byte in 25 ; * the bit stream buffer 26 ; * [in] pBitOffset pointer to the bit position in the byte pointed 27 ; * to by *ppBitStream. *pBitOffset is valid within 28 ; * [0-7]. 29 ; * [in] pSrcMVLeftMB pointers to the motion vector buffers of the 30 ; * macroblocks specially at the left side of the current macroblock 31 ; * respectively. 32 ; * [in] pSrcMVUpperMB pointers to the motion vector buffers of the 33 ; * macroblocks specially at the upper side of the current macroblock 34 ; * respectively. 35 ; * [in] pSrcMVUpperRightMB pointers to the motion vector buffers of the 36 ; * macroblocks specially at the upper-right side of the current macroblock 37 ; * respectively. 38 ; * [in] fcodeForward a code equal to vop_fcode_forward in MPEG-4 39 ; * bit stream syntax 40 ; * [in] MBType the type of the current macroblock. If MBType 41 ; * is not equal to OMX_VC_INTER4V, the destination 42 ; * motion vector buffer is still filled with the 43 ; * same decoded vector. 44 ; * [out] ppBitStream *ppBitStream is updated after the block is decoded, 45 ; * so that it points to the current byte in the bit 46 ; * stream buffer 47 ; * [out] pBitOffset *pBitOffset is updated so that it points to the 48 ; * current bit position in the byte pointed by 49 ; * *ppBitStream 50 ; * [out] pDstMVCurMB pointer to the motion vector buffer of the current 51 ; * macroblock which contains four decoded motion vectors 52 ; * 53 ; * Return Value: 54 ; * OMX_Sts_NoErr -no error 55 ; * 56 ; * 57 ; * OMX_Sts_Err - status error 58 ; * 59 ; * 60 61 INCLUDE omxtypes_s.h 62 INCLUDE armCOMM_s.h 63 INCLUDE armCOMM_BitDec_s.h 64 INCLUDE omxVC_s.h 65 66 M_VARIANTS ARM1136JS 67 68 69 70 71 IF ARM1136JS 72 73 ;//Input Arguments 74 75 ppBitStream RN 0 76 pBitOffset RN 1 77 pSrcMVLeftMB RN 2 78 pSrcMVUpperMB RN 3 79 pSrcMVUpperRightMB RN 4 80 pDstMVCurMB RN 5 81 fcodeForward RN 6 82 MBType RN 7 83 84 ;//Local Variables 85 86 zero RN 4 87 one RN 4 88 scaleFactor RN 1 89 90 91 Return RN 0 92 93 VlcMVD RN 0 94 index RN 4 95 Count RN 7 96 97 mvHorData RN 4 98 mvHorResidual RN 0 99 100 mvVerData RN 4 101 mvVerResidual RN 0 102 103 temp RN 1 104 105 temp1 RN 3 106 High RN 4 107 Low RN 2 108 Range RN 1 109 110 BlkCount RN 14 111 112 diffMVdx RN 0 113 diffMVdy RN 1 114 115 ;// Scratch Registers 116 117 RBitStream RN 8 118 RBitCount RN 9 119 RBitBuffer RN 10 120 121 T1 RN 11 122 T2 RN 12 123 LR RN 14 124 125 IMPORT armVCM4P2_aVlcMVD 126 IMPORT omxVCM4P2_FindMVpred 127 128 ;// Allocate stack memory 129 130 M_ALLOC4 ppDstMVCurMB,4 131 M_ALLOC4 pDstMVPredME,4 132 M_ALLOC4 pBlkCount,4 133 134 M_ALLOC4 pppBitStream,4 135 M_ALLOC4 ppBitOffset,4 136 M_ALLOC4 ppSrcMVLeftMB,4 137 M_ALLOC4 ppSrcMVUpperMB,4 138 139 M_ALLOC4 pdiffMVdx,4 140 M_ALLOC4 pdiffMVdy,4 141 M_ALLOC4 pHigh,4 142 143 144 145 146 M_START omxVCM4P2_DecodePadMV_PVOP,r11 147 148 M_ARG pSrcMVUpperRightMBonStack,4 ;// pointer to pSrcMVUpperRightMB on stack 149 M_ARG pDstMVCurMBonStack,4 ;// pointer to pDstMVCurMB on stack 150 M_ARG fcodeForwardonStack,4 ;// pointer to fcodeForward on stack 151 M_ARG MBTypeonStack,4 ;// pointer to MBType on stack 152 153 154 155 156 157 ;// Initializing the BitStream Macro 158 159 M_BD_INIT0 ppBitStream, pBitOffset, RBitStream, RBitBuffer, RBitCount 160 M_LDR MBType,MBTypeonStack ;// Load MBType from stack 161 M_LDR pDstMVCurMB,pDstMVCurMBonStack ;// Load pDstMVCurMB from stack 162 MOV zero,#0 163 164 TEQ MBType,#OMX_VC_INTRA ;// Check if MBType=OMX_VC_INTRA 165 TEQNE MBType,#OMX_VC_INTRA_Q ;// check if MBType=OMX_VC_INTRA_Q 166 STREQ zero,[pDstMVCurMB] 167 M_BD_INIT1 T1, T2, T2 168 STREQ zero,[pDstMVCurMB,#4] 169 M_BD_INIT2 T1, T2, T2 170 STREQ zero,[pDstMVCurMB,#4] 171 MOVEQ Return,#OMX_Sts_NoErr 172 MOV BlkCount,#0 173 STREQ zero,[pDstMVCurMB,#4] 174 175 BEQ ExitOK 176 177 TEQ MBType,#OMX_VC_INTER4V ;// Check if MBType=OMX_VC_INTER4V 178 TEQNE MBType,#OMX_VC_INTER4V_Q ;// Check if MBType=OMX_VC_INTER4V_Q 179 MOVEQ Count,#4 180 181 TEQ MBType,#OMX_VC_INTER ;// Check if MBType=OMX_VC_INTER 182 TEQNE MBType,#OMX_VC_INTER_Q ;// Check if MBType=OMX_VC_INTER_Q 183 MOVEQ Count,#1 184 185 M_LDR fcodeForward,fcodeForwardonStack ;// Load fcodeForward from stack 186 187 ;// Storing the values temporarily on stack 188 189 M_STR ppBitStream,pppBitStream 190 M_STR pBitOffset,ppBitOffset 191 192 193 SUB temp,fcodeForward,#1 ;// temp=fcodeForward-1 194 MOV one,#1 195 M_STR pSrcMVLeftMB,ppSrcMVLeftMB 196 LSL scaleFactor,one,temp ;// scaleFactor=1<<(fcodeForward-1) 197 M_STR pSrcMVUpperMB,ppSrcMVUpperMB 198 LSL scaleFactor,scaleFactor,#5 199 M_STR scaleFactor,pHigh ;// [pHigh]=32*scaleFactor 200 201 ;// VLD Decoding 202 203 204 Loop 205 206 LDR VlcMVD, =armVCM4P2_aVlcMVD ;// Load the optimized MVD VLC table 207 208 ;// Horizontal Data and Residual calculation 209 210 LDR temp,=0xFFF 211 M_BD_VLD index,T1,T2,VlcMVD,3,2 ;// variable lenght decoding using the macro 212 213 TEQ index,temp 214 BEQ ExitError ;// Exit with an Error Message if the decoded symbol is an invalied symbol 215 216 SUB mvHorData,index,#32 ;// mvHorData=index-32 217 MOV mvHorResidual,#1 ;// mvHorResidual=1 218 CMP fcodeForward,#1 219 TEQNE mvHorData,#0 220 MOVEQ diffMVdx,mvHorData ;// if scaleFactor=1(fcodeForward=1) or mvHorData=0 diffMVdx=mvHorData 221 BEQ VerticalData 222 223 SUB temp,fcodeForward,#1 224 M_BD_VREAD8 mvHorResidual,temp,T1,T2 ;// get mvHorResidual from bitstream if fcodeForward>1 and mvHorData!=0 225 226 CMP mvHorData,#0 227 RSBLT mvHorData,mvHorData,#0 ;// mvHorData=abs(mvHorData) 228 SUB mvHorResidual,mvHorResidual,fcodeForward 229 SMLABB diffMVdx,mvHorData,fcodeForward,mvHorResidual ;// diffMVdx=abs(mvHorData)*fcodeForward+mvHorResidual-fcodeForward 230 ADD diffMVdx,diffMVdx,#1 231 RSBLT diffMVdx,diffMVdx,#0 232 233 ;// Vertical Data and Residual calculation 234 235 VerticalData 236 237 M_STR diffMVdx,pdiffMVdx ;// Store the diffMVdx on stack 238 LDR VlcMVD, =armVCM4P2_aVlcMVD ;// Loading the address of optimized VLC tables 239 240 LDR temp,=0xFFF 241 M_BD_VLD index,T1,T2,VlcMVD,3,2 ;// VLC decoding using the macro 242 243 TEQ index,temp 244 BEQ ExitError ;// Exit with an Error Message if an Invalied Symbol occurs 245 246 SUB mvVerData,index,#32 ;// mvVerData=index-32 247 MOV mvVerResidual,#1 248 CMP fcodeForward,#1 249 TEQNE mvVerData,#0 250 MOVEQ diffMVdy,mvVerData ;// diffMVdy = mvVerData if scaleFactor=1(fcodeForward=1) or mvVerData=0 251 BEQ FindMVPred 252 253 SUB temp,fcodeForward,#1 254 M_BD_VREAD8 mvVerResidual,temp,T1,T2 ;// Get mvVerResidual from bit stream if fcodeForward>1 and mnVerData!=0 255 256 257 CMP mvVerData,#0 258 RSBLT mvVerData,mvVerData,#0 259 SUB mvVerResidual,mvVerResidual,fcodeForward 260 SMLABB diffMVdy,mvVerData,fcodeForward,mvVerResidual ;// diffMVdy=abs(mvVerData)*fcodeForward+mvVerResidual-fcodeForward 261 ADD diffMVdy,diffMVdy,#1 262 RSBLT diffMVdy,diffMVdy,#0 263 264 ;//Calling the Function omxVCM4P2_FindMVpred 265 266 FindMVPred 267 268 M_STR diffMVdy,pdiffMVdy 269 ADD temp,pDstMVCurMB,BlkCount,LSL #2 ;// temp=pDstMVCurMB[BlkCount] 270 M_STR temp,ppDstMVCurMB ;// store temp on stack for passing as an argument to FindMVPred 271 272 MOV temp,#0 273 M_STR temp,pDstMVPredME ;// Pass pDstMVPredME=NULL as an argument 274 M_STR BlkCount,pBlkCount ;// Passs BlkCount as Argument through stack 275 276 MOV temp,pSrcMVLeftMB ;// temp (RN 1)=pSrcMVLeftMB 277 M_LDR pSrcMVUpperRightMB,pSrcMVUpperRightMBonStack 278 MOV pSrcMVLeftMB,pSrcMVUpperMB ;// pSrcMVLeftMB ( RN 2) = pSrcMVUpperMB 279 MOV ppBitStream,pDstMVCurMB ;// ppBitStream ( RN 0) = pDstMVCurMB 280 MOV pSrcMVUpperMB,pSrcMVUpperRightMB ;// pSrcMVUpperMB( RN 3) = pSrcMVUpperRightMB 281 BL omxVCM4P2_FindMVpred ;// Branch to subroutine omxVCM4P2_FindMVpred 282 283 ;// Store Horizontal Motion Vector 284 285 M_LDR BlkCount,pBlkCount ;// Load BlkCount from stack 286 M_LDR High,pHigh ;// High=32*scaleFactor 287 LSL temp1,BlkCount,#2 ;// temp=BlkCount*4 288 M_LDR diffMVdx,pdiffMVdx ;// Laad diffMVdx 289 290 LDRSH temp,[pDstMVCurMB,temp1] ;// temp=pDstMVCurMB[BlkCount] 291 292 293 RSB Low,High,#0 ;// Low = -32*scaleFactor 294 ADD diffMVdx,temp,diffMVdx ;// diffMVdx=pDstMVCurMB[BlkCount]+diffMVdx 295 ADD Range,High,High ;// Range=64*ScaleFactor 296 SUB High,High,#1 ;// High= 32*scaleFactor-1 297 298 CMP diffMVdx,Low ;// If diffMVdx<Low 299 ADDLT diffMVdx,diffMVdx,Range ;// diffMVdx+=Range 300 301 CMP diffMVdx,High 302 SUBGT diffMVdx,diffMVdx,Range ;// If diffMVdx > High diffMVdx-=Range 303 STRH diffMVdx,[pDstMVCurMB,temp1] 304 305 ;// Store Vertical 306 307 ADD temp1,temp1,#2 ;// temp1=4*BlkCount+2 308 M_LDR diffMVdx,pdiffMVdy ;// Laad diffMVdy 309 LDRSH temp,[pDstMVCurMB,temp1] ;// temp=pDstMVCurMB[BlkCount].diffMVdy 310 ADD BlkCount,BlkCount,#1 ;// BlkCount=BlkCount+1 311 ADD diffMVdx,temp,diffMVdx 312 CMP diffMVdx,Low 313 ADDLT diffMVdx,diffMVdx,Range ;// If diffMVdy<Low diffMVdy+=Range 314 CMP diffMVdx,High 315 SUBGT diffMVdx,diffMVdx,Range ;// If diffMVdy > High diffMVdy-=Range 316 STRH diffMVdx,[pDstMVCurMB,temp1] 317 318 CMP BlkCount,Count 319 M_LDR pSrcMVLeftMB,ppSrcMVLeftMB 320 M_LDR pSrcMVUpperMB,ppSrcMVUpperMB 321 322 BLT Loop ;// If BlkCount<Count Continue the Loop 323 324 325 ;// If MBType=OMX_VC_INTER or MBtype=OMX_VC_INTER_Q copy pDstMVCurMB[0] to 326 ;// pDstMVCurMB[1], pDstMVCurMB[2], pDstMVCurMB[3] 327 328 M_LDR MBType,MBTypeonStack 329 330 TEQ MBType,#OMX_VC_INTER 331 TEQNE MBType,#OMX_VC_INTER_Q 332 LDREQ temp,[pDstMVCurMB] 333 M_LDR ppBitStream,pppBitStream 334 STREQ temp,[pDstMVCurMB,#4] 335 336 STREQ temp,[pDstMVCurMB,#8] 337 STREQ temp,[pDstMVCurMB,#12] 338 339 340 M_LDR pBitOffset,ppBitOffset 341 ;//Ending the macro 342 M_BD_FINI ppBitStream,pBitOffset ;// Finishing the Macro 343 344 345 MOV Return,#OMX_Sts_NoErr 346 B ExitOK 347 348 ExitError 349 350 M_LDR ppBitStream,pppBitStream 351 M_LDR pBitOffset,ppBitOffset 352 ;//Ending the macro 353 M_BD_FINI ppBitStream,pBitOffset 354 355 MOV Return,#OMX_Sts_Err 356 357 ExitOK 358 359 M_END 360 ENDIF 361 END 362 363 364 365
