1 ;/** 2 ; * 3 ; * File Name: omxVCM4P2_QuantInvIntra_I_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 ; * Description: 13 ; * Contains modules for inter reconstruction 14 ; * 15 ; * 16 ; * 17 ; * 18 ; * 19 ; * 20 ; * Function: omxVCM4P2_QuantInvIntra_I 21 ; * 22 ; * Description: 23 ; * Performs inverse quantization on intra/inter coded block. 24 ; * This function supports bits_per_pixel = 8. Mismatch control 25 ; * is performed for the first MPEG-4 mode inverse quantization method. 26 ; * The output coefficients are clipped to the range: [-2048, 2047]. 27 ; * Mismatch control is performed for the first inverse quantization method. 28 ; * 29 ; * Remarks: 30 ; * 31 ; * Parameters: 32 ; * [in] pSrcDst pointer to the input (quantized) intra/inter block. Must be 16-byte aligned. 33 ; * [in] QP quantization parameter (quantiser_scale) 34 ; * [in] videoComp (Intra version only.) Video component type of the 35 ; * current block. Takes one of the following flags: 36 ; * OMX_VC_LUMINANCE, OMX_VC_CHROMINANCE, 37 ; * OMX_VC_ALPHA. 38 ; * [in] shortVideoHeader a flag indicating presence of short_video_header; 39 ; * shortVideoHeader==1 selects linear intra DC mode, 40 ; * and shortVideoHeader==0 selects nonlinear intra DC mode. 41 ; * [out] pSrcDst pointer to the output (dequantized) intra/inter block. Must be 16-byte aligned. 42 ; * 43 ; * Return Value: 44 ; * OMX_Sts_NoErr - no error 45 ; * OMX_Sts_BadArgErr - bad arguments 46 ; * - If pSrcDst is NULL or is not 16-byte aligned. 47 ; * or 48 ; * - If QP <= 0. 49 ; * or 50 ; * - videoComp is none of OMX_VC_LUMINANCE, OMX_VC_CHROMINANCE and OMX_VC_ALPHA. 51 ; * 52 53 54 INCLUDE omxtypes_s.h 55 INCLUDE armCOMM_s.h 56 57 M_VARIANTS ARM1136JS 58 59 60 IMPORT armVCM4P2_DCScaler 61 62 63 64 IF ARM1136JS 65 66 ;//Input Arguments 67 pSrcDst RN 0 68 QP RN 1 69 videoComp RN 2 70 shortVideoHeader RN 3 71 72 ;//Local Variables 73 Return RN 0 74 dcScaler RN 4 75 temp RN 12 76 index RN 6 77 78 tempVal21 RN 4 79 tempVal43 RN 5 80 QP1 RN 6 81 X2 RN 7 82 X3 RN 14 83 Result1 RN 8 84 Result2 RN 9 85 two RN 10 86 Count RN 11 87 88 89 90 91 M_START omxVCM4P2_QuantInvIntra_I,r11 92 93 94 95 ;// Perform Inverse Quantization for DC coefficient 96 97 TEQ shortVideoHeader,#0 ;// Test if short Video Header flag =0 98 MOVNE dcScaler,#8 ;// if shortVideoHeader is non zero dcScaler=8 99 BNE calDCVal 100 LDR index, =armVCM4P2_DCScaler 101 ADD index,index,videoComp,LSL #5 102 LDRB dcScaler,[index,QP] 103 104 105 ;//M_CalDCScalar shortVideoHeader,videoComp, QP 106 107 calDCVal 108 109 LDRH temp,[pSrcDst] 110 SMULBB temp,temp,dcScaler ;// dcCoeff = dcScaler * Quantized DC coefficient(from memory) 111 SSAT temp,#12,temp ;// Saturating to 12 bits 112 113 114 MOV Count,#64 115 TST QP,#1 116 LDRD tempVal21,[pSrcDst] ;// Loads first two values of pSrcDst to tempVal21, 117 ;// next two values to tempVal43 118 SUBEQ QP1,QP,#1 ;// QP1=QP if QP is odd , QP1=QP-1 if QP is even 119 MOVNE QP1,QP 120 MOV two,#2 121 122 123 124 125 126 Loop 127 128 129 SMULBB X2,tempVal21,two ;// X2= first val(lower 16 bits of tampVal21)*2 130 CMP X2,#0 131 132 RSBLT X2,X2,#0 ;// X2=absoluteval(first val) 133 SMLABBNE X2,QP,X2,QP1 ;// X2=2*absval(first val)*QP+QP if QP is odd 134 ;// X2=2*absval(first val)*QP+QP-1 if QP is even 135 SMULTB X3,tempVal21,two ;// X3= second val(top 16 bits of tampVal21)*2 136 RSBLT X2,X2,#0 137 138 CMP X3,#0 139 140 RSBLT X3,X3,#0 141 SMLABBNE X3,QP,X3,QP1 142 143 RSBLT X3,X3,#0 144 PKHBT Result1,X2,X3,LSL #16 ;// Result1[0-15]=X2[0-15],Result1[16-31]=X3[16-31] 145 SMULBB X2,tempVal43,two ;// X2= first val(lower 16 bits of tampVal43)*2 146 SSAT16 Result1,#12,Result1 ;// clip to range [-2048,2047] 147 CMP X2,#0 148 149 150 151 RSBLE X2,X2,#0 152 SMLABBNE X2,QP,X2,QP1 153 SMULTB X3,tempVal43,two ;// X2= first val(top 16 bits of tampVal21)*2 154 RSBLT X2,X2,#0 155 CMP X3,#0 156 157 LDRD tempVal21,[pSrcDst,#8] ;// Load next four Values to tempVal21,tempVal43 158 159 RSBLT X3,X3,#0 160 SMLABBNE X3,QP,X3,QP1 161 RSBLT X3,X3,#0 162 PKHBT Result2,X2,X3,LSL #16 ;// Result2[0-15]=X2[0-15],Result2[16-31]=X3[16-31] 163 SSAT16 Result2,#12,Result2 ;// clip to range [-2048,2047] 164 165 SUBS Count,Count,#4 ;// Decrement Count by 4 and continue if it has not reached 0 166 STRD Result1,[pSrcDst],#8 ;// Store Double words and increment the pointer to point the next store address 167 168 169 170 BGT Loop 171 172 SUB pSrcDst,pSrcDst,#128 173 174 ;// Storing the Inverse Quantized DC coefficient 175 176 STRH temp,[pSrcDst],#2 177 178 179 180 MOV Return,#OMX_Sts_NoErr 181 182 183 184 185 M_END 186 ENDIF 187 END 188 189
