1 ;/** 2 ; * 3 ; * File Name: omxVCM4P2_QuantInvInter_I_s.s 4 ; * OpenMAX DL: v1.0.2 5 ; * Revision: 12290 6 ; * Date: Wednesday, April 9, 2008 7 ; * 8 ; * (c) Copyright 2007-2008 ARM Limited. All Rights Reserved. 9 ; * 10 ; * 11 ; * 12 ; * Description: 13 ; * Contains modules for inter reconstruction 14 ; * 15 ; * 16 ; * 17 ; * 18 ; * 19 ; * Function: omxVCM4P2_QuantInvInter_I 20 ; * 21 ; * Description: 22 ; * Performs inverse quantization on intra/inter coded block. 23 ; * This function supports bits_per_pixel = 8. Mismatch control 24 ; * is performed for the first MPEG-4 mode inverse quantization method. 25 ; * The output coefficients are clipped to the range: [-2048, 2047]. 26 ; * Mismatch control is performed for the first inverse quantization method. 27 ; * 28 ; * Remarks: 29 ; * 30 ; * Parameters: 31 ; * [in] pSrcDst pointer to the input (quantized) intra/inter block. Must be 16-byte aligned. 32 ; * [in] QP quantization parameter (quantiser_scale) 33 ; * [in] videoComp (Intra version only.) Video component type of the 34 ; * current block. Takes one of the following flags: 35 ; * OMX_VC_LUMINANCE, OMX_VC_CHROMINANCE, 36 ; * OMX_VC_ALPHA. 37 ; * [in] shortVideoHeader a flag indicating presence of short_video_header; 38 ; * shortVideoHeader==1 selects linear intra DC mode, 39 ; * and shortVideoHeader==0 selects nonlinear intra DC mode. 40 ; * [out] pSrcDst pointer to the output (dequantized) intra/inter block. Must be 16-byte aligned. 41 ; * 42 ; * Return Value: 43 ; * OMX_Sts_NoErr - no error 44 ; * OMX_Sts_BadArgErr - bad arguments 45 ; * - If pSrcDst is NULL or is not 16-byte aligned. 46 ; * or 47 ; * - If QP <= 0. 48 ; * or 49 ; * - videoComp is none of OMX_VC_LUMINANCE, OMX_VC_CHROMINANCE and OMX_VC_ALPHA. 50 ; * 51 ; */ 52 53 INCLUDE omxtypes_s.h 54 INCLUDE armCOMM_s.h 55 56 M_VARIANTS CortexA8 57 58 IF CortexA8 59 60 61 ;//Input Arguments 62 pSrcDst RN 0 63 QP RN 1 64 65 66 ;//Local Variables 67 Count RN 3 68 doubleQP RN 4 69 Return RN 0 70 ;// Neon registers 71 72 73 dQP10 DN D0.S32[0] 74 qQP1 QN Q0.S32 75 76 dQP1 DN D0.S16 77 dMinusQP1 DN D1.S16 78 79 dCoeff0 DN D2.S16 80 dCoeff1 DN D3.S16 81 82 qResult0 QN Q3.S32 83 dResult0 DN D7.S16 84 qSign0 QN Q3.S32 85 dSign0 DN D6.S16 86 87 qResult1 QN Q4.S32 88 dResult1 DN D8.S16 89 qSign1 QN Q4.S32 90 dSign1 DN D8.S16 91 92 d2QP0 DN D10.S32[0] 93 q2QP0 QN Q5.S32 94 d2QP DN D10.S16 95 96 dZero0 DN D11.S16 97 dZero1 DN D12.S16 98 dConst0 DN D13.S16 99 100 101 M_START omxVCM4P2_QuantInvInter_I,r4,d13 102 103 104 105 ADD doubleQP,QP,QP ;// doubleQP= 2*QP 106 VMOV d2QP0,doubleQP 107 VDUP q2QP0,d2QP0 ;// Move doubleQP in to a scalar 108 TST QP,#1 109 VLD1 {dCoeff0,dCoeff1},[pSrcDst] ;// Load first 8 values to Coeff0,Coeff1 110 SUBEQ QP,QP,#1 111 VMOV dQP10,QP ;// If QP is even then QP1=QP-1 else QP1=QP 112 MOV Count,#64 113 VDUP qQP1,dQP10 ;// Duplicate tempResult with QP1 114 VSHRN d2QP,q2QP0,#0 115 VEOR dConst0,dConst0,dConst0 116 VSHRN dQP1,qQP1,#0 ;// QP1 truncated to 16 bits 117 VSUB dMinusQP1,dConst0,dQP1 ;// dMinusQP1=-QP1 118 119 Loop 120 121 ;//Performing Inverse Quantization 122 123 VCLT dSign0,dCoeff0, #0 ;// Compare Coefficient 0 against 0 124 VCLT dSign1,dCoeff1, #0 ;// Compare Coefficient 1 against 0 125 VCEQ dZero0,dCoeff0,#0 ;// Compare Coefficient 0 against zero 126 VBSL dSign0,dMinusQP1,dQP1 ;// dSign0 = -QP1 if Coeff0< 0 else QP1 127 VCEQ dZero1,dCoeff1,#0 ;// Compare Coefficient 1 against zero 128 VBSL dSign1,dMinusQP1,dQP1 ;// dSign1 = -QP1 if Coeff1< 0 else QP1 129 VMOVL qSign0,dSign0 ;// Sign extend qSign0 to 32 bits 130 VMOVL qSign1,dSign1 131 VMLAL qResult0,dCoeff0,d2QP ;// qResult0[i]= qCoeff0[i]+qCoeff0[i]*(-2) if Coeff <0 132 ;// qResult0[i]= qCoeff0[i] if Coeff >=0 133 VMLAL qResult1,dCoeff1,d2QP ;// qResult1[i]= qCoeff1[i]+qCoeff1[i]*(-2) if Coeff <0 134 ;// qResult1[i]= qCoeff1[i] if Coeff >=0 135 ;// Clip Result to [-2048,2047] 136 137 VQSHL qResult0,qResult0,#20 ;// clip to [-2048,2047] 138 VQSHL qResult1,qResult1,#20 139 140 VSHR qResult0,qResult0,#4 141 VSHR qResult1,qResult1,#4 142 VSHRN dResult0,qResult0,#16 ;// Narrow the clipped Value to Halfword 143 VSHRN dResult1,qResult1,#16 144 VBIT dResult0,dConst0,dZero0 145 VBIT dResult1,dConst0,dZero1 146 147 VST1 {dResult0,dResult1},[pSrcDst]! ;// Store the result 148 SUBS Count,Count,#8 149 VLD1 {dCoeff0,dCoeff1},[pSrcDst] 150 151 152 BGT Loop 153 154 MOV Return,#OMX_Sts_NoErr 155 156 157 M_END 158 ENDIF 159 160 161 END 162 163
