| ;// |
| ;// Copyright (C) 2007-2008 ARM Limited |
| ;// |
| ;// Licensed under the Apache License, Version 2.0 (the "License"); |
| ;// you may not use this file except in compliance with the License. |
| ;// You may obtain a copy of the License at |
| ;// |
| ;// http://www.apache.org/licenses/LICENSE-2.0 |
| ;// |
| ;// Unless required by applicable law or agreed to in writing, software |
| ;// distributed under the License is distributed on an "AS IS" BASIS, |
| ;// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| ;// See the License for the specific language governing permissions and |
| ;// limitations under the License. |
| ;// |
| ; ********** |
| ; * |
| ; * File Name: omxVCM4P2_PredictReconCoefIntra_s.s |
| ; * OpenMAX DL: v1.0.2 |
| ; * Revision: 9641 |
| ; * Date: Thursday, February 7, 2008 |
| ; * |
| ; * |
| ; * |
| ; * |
| ; * Description: |
| ; * Contains module for DC/AC coefficient prediction |
| ; * |
| ; * |
| ; * Function: omxVCM4P2_PredictReconCoefIntra |
| ; * |
| ; * Description: |
| ; * Performs adaptive DC/AC coefficient prediction for an intra block. Prior |
| ; * to the function call, prediction direction (predDir) should be selected |
| ; * as specified in subclause 7.4.3.1 of ISO/IEC 14496-2. |
| ; * |
| ; * Remarks: |
| ; * |
| ; * Parameters: |
| ; * [in] pSrcDst pointer to the coefficient buffer which contains the |
| ; * quantized coefficient residuals (PQF) of the current |
| ; * block; must be aligned on a 4-byte boundary. The |
| ; * output coefficients are saturated to the range |
| ; * [-2048, 2047]. |
| ; * [in] pPredBufRow pointer to the coefficient row buffer; must be aligned |
| ; * on a 4-byte boundary. |
| ; * [in] pPredBufCol pointer to the coefficient column buffer; must be |
| ; * aligned on a 4-byte boundary. |
| ; * [in] curQP quantization parameter of the current block. curQP may |
| ; * equal to predQP especially when the current block and |
| ; * the predictor block are in the same macroblock. |
| ; * [in] predQP quantization parameter of the predictor block |
| ; * [in] predDir indicates the prediction direction which takes one |
| ; * of the following values: |
| ; * OMX_VIDEO_HORIZONTAL predict horizontally |
| ; * OMX_VIDEO_VERTICAL predict vertically |
| ; * [in] ACPredFlag a flag indicating if AC prediction should be |
| ; * performed. It is equal to ac_pred_flag in the bit |
| ; * stream syntax of MPEG-4 |
| ; * [in] videoComp video component type (luminance, chrominance or |
| ; * alpha) of the current block |
| ; * [out] pSrcDst pointer to the coefficient buffer which contains |
| ; * the quantized coefficients (QF) of the current |
| ; * block |
| ; * [out] pPredBufRow pointer to the updated coefficient row buffer |
| ; * [out] pPredBufCol pointer to the updated coefficient column buffer |
| ; * Return Value: |
| ; * OMX_Sts_NoErr - no error |
| ; * OMX_Sts_BadArgErr - Bad arguments |
| ; * - At least one of the pointers is NULL: pSrcDst, pPredBufRow, or pPredBufCol. |
| ; * - At least one the following cases: curQP <= 0, predQP <= 0, curQP >31, |
| ; * predQP > 31, preDir exceeds [1,2]. |
| ; * - At least one of the pointers pSrcDst, pPredBufRow, or pPredBufCol is not |
| ; * 4-byte aligned. |
| ; * |
| ; ********* |
| |
| INCLUDE omxtypes_s.h |
| INCLUDE armCOMM_s.h |
| |
| M_VARIANTS ARM1136JS |
| |
| |
| |
| IMPORT armVCM4P2_Reciprocal_QP_S32 |
| IMPORT armVCM4P2_Reciprocal_QP_S16 |
| IMPORT armVCM4P2_DCScaler |
| |
| |
| |
| IF ARM1136JS |
| |
| |
| ;// Input Arguments |
| |
| pSrcDst RN 0 |
| pPredBufRow RN 1 |
| pPredBufCol RN 2 |
| curQP RN 3 |
| QP RN 3 |
| predQP RN 4 |
| predDir RN 5 |
| ACPredFlag RN 6 |
| videoComp RN 7 |
| |
| ;// Local Variables |
| |
| temp2 RN 5 |
| negCurQP RN 7 |
| negdcScaler RN 7 |
| tempPred RN 8 |
| |
| dcScaler RN 4 |
| CoeffTable RN 9 |
| absCoeffDC RN 9 |
| temp3 RN 6 |
| absCoeffAC RN 6 |
| |
| shortVideoHeader RN 9 |
| predCoeffTable RN 10 |
| Count RN 10 |
| temp1 RN 12 |
| index RN 12 |
| Rem RN 14 |
| temp RN 11 |
| Return RN 0 |
| |
| |
| |
| M_START omxVCM4P2_PredictReconCoefIntra,r12 |
| |
| ;// Assigning pointers to Input arguments on Stack |
| |
| M_ARG predQPonStack,4 |
| M_ARG predDironStack,4 |
| M_ARG ACPredFlagonStack,4 |
| M_ARG videoComponStack,4 |
| |
| ;// DC Prediction |
| |
| M_LDR videoComp,videoComponStack ;// Load videoComp From Stack |
| |
| M_LDR predDir,predDironStack ;// Load Prediction direction |
| |
| ;// dcScaler Calculation |
| |
| LDR index, =armVCM4P2_DCScaler |
| ADD index,index,videoComp,LSL #5 |
| LDRB dcScaler,[index,QP] |
| |
| |
| calDCVal |
| |
| |
| LDR predCoeffTable, =armVCM4P2_Reciprocal_QP_S16 ;// Loading the table with entries 32767/(1 to 63) |
| |
| CMP predDir,#2 ;// Check if the Prediction direction is vertical |
| |
| ;// Caulucate temp pred by performing Division |
| |
| LDREQSH absCoeffDC,[pPredBufRow] ;// If vetical load the coeff from Row Prediction Buffer |
| LDRNESH absCoeffDC,[pPredBufCol] ;// If horizontal load the coeff from column Prediction Buffer |
| |
| RSB negdcScaler,dcScaler,#0 ;// negdcScaler=-dcScaler |
| |
| MOV temp1,absCoeffDC ;// temp1=prediction coeff |
| CMP temp1,#0 |
| RSBLT absCoeffDC,temp1,#0 ;//absCoeffDC=abs(temp1) |
| |
| ADD temp,dcScaler,dcScaler |
| LDRH temp,[predCoeffTable,temp] ;// Load value from coeff table for performing division using multiplication |
| |
| SMULBB tempPred,temp,absCoeffDC ;// tempPred=pPredBufRow(Col)[0]*32767/dcScaler |
| ADD temp3,dcScaler,#1 |
| LSR tempPred,tempPred,#15 ;// tempPred=pPredBufRow(Col)[0]/dcScaler |
| LSR temp3,temp3,#1 ;// temp3=round(dcScaler/2) |
| |
| MLA Rem,negdcScaler,tempPred,absCoeffDC ;// Rem = pPredBufRow(Col)[0]-tempPred*dcScaler |
| |
| |
| LDRH temp,[pPredBufCol] |
| CMP Rem,temp3 |
| ADDGE tempPred,#1 ;// If Rem>=round(dcScaler/2);tempPred=tempPred+1 |
| CMP temp1,#0 |
| RSBLT tempPred,tempPred,#0 ;/ if pPredBufRow(Col)[0]<0; tempPred=-tempPred |
| |
| |
| STRH temp,[pPredBufRow,#-16] |
| |
| LDRH temp,[pSrcDst] ;// temp=pSrcDst[0] |
| M_LDR ACPredFlag,ACPredFlagonStack |
| ADD temp,temp,tempPred ;// temp=pSrcDst[0]+tempPred |
| SSAT16 temp,#12,temp ;// clip temp to [-2048,2047] |
| |
| SMULBB temp1,temp,dcScaler ;// temp1=clipped(pSrcDst[0])*dcScaler |
| M_LDR predQP,predQPonStack |
| STRH temp,[pSrcDst] |
| CMP ACPredFlag,#1 ;// Check if the AC prediction flag is set or not |
| STRH temp1,[pPredBufCol] ;// store temp1 to pPredBufCol |
| |
| ;// AC Prediction |
| |
| |
| BNE Exit ;// If not set Exit |
| |
| LDR predCoeffTable, =armVCM4P2_Reciprocal_QP_S32 ;// Loading the table with entries 0x1ffff/(1 to 63) |
| MOV temp1,#4 |
| MUL temp1,curQP,temp1 |
| CMP predDir,#2 ;// Check the Prediction direction |
| RSB negCurQP,curQP,#0 |
| LDR CoeffTable,[predCoeffTable,temp1] ;// CoeffTable=0x1ffff/curQP |
| ADD curQP,curQP,#1 ;// curQP=curQP+1 |
| LSR curQP,curQP,#1 ;// curQP=round(curQP/2) |
| MOV Count,#2 ;// Initializing the Loop Count |
| BNE Horizontal ;// If the Prediction direction is horizontal branch to Horizontal |
| |
| |
| |
| loop1 |
| ;// Calculate tempPred |
| |
| LDRSH absCoeffAC,[pPredBufRow,Count] ;// absCoeffAC=pPredBufRow[i], 1=<i<=7 |
| MOV temp1,absCoeffAC |
| CMP temp1,#0 ;// compare pPredBufRow[i] with zero, 1=<i<=7 |
| RSBLT absCoeffAC,temp1,#0 ;// absCoeffAC= abs(pPredBufRow[i]) |
| |
| SMULBB absCoeffAC,absCoeffAC,predQP ;// temp1=pPredBufRow[i]*predQP |
| MUL tempPred,absCoeffAC,CoeffTable ;// tempPred=pPredBufRow[i]*predQP*0x1ffff/curQP |
| LSR tempPred,tempPred,#17 |
| |
| MLA Rem,negCurQP,tempPred,absCoeffAC ;// Rem=abs(pPredBufRow[i])-tempPred*curQP |
| LDRH temp,[pSrcDst,Count] ;// temp=pSrcDst[i],1<=i<8 |
| |
| CMP Rem,curQP |
| ADDGE tempPred,#1 ;// if Rem>=round(curQP/2); tempPred=tempPred+1 |
| CMP temp1,#0 |
| RSBLT tempPred,tempPred,#0 ;// if pPredBufRow[i]<0 ; tempPred=-tempPred |
| |
| ;// Update source and Row Prediction buffers |
| |
| ADD temp,temp,tempPred ;// temp=tempPred+pSrcDst[i] |
| SSAT16 temp,#12,temp ;// Clip temp to [-2048,2047] |
| STRH temp,[pSrcDst,Count] |
| STRH temp,[pPredBufRow,Count] ;// pPredBufRow[i]=temp |
| ADD Count,Count,#2 ;// i=i+1 |
| CMP Count,#16 ;// compare if i=8 |
| BLT loop1 |
| B Exit ;// Branch to exit |
| |
| Horizontal |
| |
| MOV Count,#16 ;// Initializing i=8 |
| |
| loop2 |
| |
| LSR temp2,Count,#3 ;// temp2=i>>3 |
| |
| ;// Calculate tempPred |
| |
| LDRH absCoeffAC,[pPredBufCol,temp2] ;// absCoefAC=pPredBufCol[i>>3] |
| MOV temp1,absCoeffAC |
| CMP temp1,#0 ;// compare pPredBufRow[i] with zero, 1=<i<=7 |
| RSBLT absCoeffAC,temp1,#0 ;// absCoeffAC=abs(pPredBufCol[i>>3]) |
| |
| SMULBB absCoeffAC,absCoeffAC,predQP ;// temp1=pPredBufCol[i>>3]*predQP |
| MUL tempPred,absCoeffAC,CoeffTable ;// tempPred=pPredBufCol[i>>3]*predQP*0x1ffff/curQP |
| LSR tempPred,tempPred,#17 ;// tempPred=pPredBufCol[i>>3]*predQP/curQP |
| |
| MLA Rem,negCurQP,tempPred,absCoeffAC |
| LDRH temp,[pSrcDst,Count] ;// temp=pSrcDst[i] |
| |
| CMP Rem,curQP ;// Compare Rem with round(curQP/2) |
| ADDGE tempPred,#1 ;// tempPred=tempPred+1 if Rem>=round(curQP/2) |
| CMP temp1,#0 |
| RSBLT tempPred,tempPred,#0 ;// if pPredBufCol[i>>3 <0 tempPred=-tempPred |
| |
| ;// Update source and Row Prediction buffers |
| |
| ADD temp,temp,tempPred ;// temp=pSrcDst[i]+tempPred |
| SSAT16 temp,#12,temp ;// Clip temp to [-2048,2047] |
| STRH temp,[pSrcDst,Count] ;// pSrcDst[0]= clipped value |
| STRH temp,[pPredBufCol,temp2] ;// pPredBufCol[i>>3]=temp |
| ADD Count,Count,#16 ;// i=i+8 |
| CMP Count,#128 ;// compare i with 64 |
| BLT loop2 |
| |
| |
| Exit |
| |
| MOV Return,#OMX_Sts_NoErr |
| |
| M_END |
| ENDIF |
| END |
| |
| |
| |
