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|
;//
;//
;// File Name: omxVCM4P10_TransformDequantChromaDCFromPair_s.s
;// OpenMAX DL: v1.0.2
;// Revision: 9641
;// Date: Thursday, February 7, 2008
;//
;// (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
;//
;//
;//
INCLUDE omxtypes_s.h
INCLUDE armCOMM_s.h
IMPORT armVCM4P10_QPDivTable
IMPORT armVCM4P10_VMatrixQPModTable
M_VARIANTS ARM1136JS
IF ARM1136JS
;//--------------------------------------
;// Declare input registers
;//--------------------------------------
ppSrc RN 0
pDst RN 1
QP RN 2
;//--------------------------------
;// Scratch variable for Unpack2x2
;//--------------------------------
pSrc RN 9
Value RN 4
Value2 RN 5
Flag RN 6
strOffset RN 7
cstOffset RN 8
;//--------------------------------
;// Scratch variable
;//--------------------------------
r0w0 RN 3
r0w1 RN 4
c0w0 RN 5
c1w0 RN 6
return RN 0
pQPDivTable RN 5
pQPModTable RN 6
Shift RN 9
Scale RN 2
Temp1 RN 3
Temp2 RN 4
Temp3 RN 7
Temp4 RN 8
;// Write function header
M_START omxVCM4P10_TransformDequantChromaDCFromPair, r9
LDR pSrc, [ppSrc] ;// Load pSrc
MOV cstOffset, #31 ;// To be used in the loop, to compute offset
;//-----------------------------------------------------------------------
;// Firstly, fill all the coefficient values on the <pDst> buffer by zero
;//-----------------------------------------------------------------------
MOV Value, #0 ;// Initialize the zero value
MOV Value2, #0 ;// Initialize the zero value
LDRB Flag, [pSrc], #1 ;// Preload <Flag> before <unpackLoop>
STRD Value, [pDst, #0] ;// pDst[0] = pDst[1] = pDst[2] = pDst[3] = 0
unpackLoop
TST Flag, #0x10 ;// Computing (Flag & 0x10)
LDRSBNE Value2,[pSrc,#1]
LDRBNE Value, [pSrc], #2 ;// Load byte wise to avoid unaligned access
AND strOffset, cstOffset, Flag, LSL #1 ;// strOffset = (Flag & 15) < 1;
LDRSBEQ Value, [pSrc], #1 ;// Value = (OMX_U8) *pSrc++
ORRNE Value,Value,Value2, LSL #8 ;// Value = (OMX_U16) *pSrc++
TST Flag, #0x20 ;// Computing (Flag & 0x20) to check, if we're done
LDRBEQ Flag, [pSrc], #1 ;// Flag = (OMX_U8) *pSrc++, for next iteration
STRH Value, [pDst, strOffset] ;// Store <Value> at offset <strOffset>
BEQ unpackLoop ;// Branch to the loop beginning
LDMIA pDst, {r0w0, r0w1} ;// r0w0 = |c1|c0| & r0w1 = |c3|c2|
STR pSrc, [ppSrc] ;// Update the bitstream pointer
LDR pQPDivTable, =armVCM4P10_QPDivTable ;// QP Division look-up-table base pointer
LDR pQPModTable, =armVCM4P10_VMatrixQPModTable ;// QP Modulo look-up-table base pointer
SADDSUBX r0w0, r0w0, r0w0 ;// [ c00+c01, c00-c01 ]
SADDSUBX r0w1, r0w1, r0w1 ;// [ c10+c11, c10-c11 ]
LDRSB Shift, [pQPDivTable, QP] ;// Shift = pQPDivTable[QP]
LDRSB Scale, [pQPModTable, QP] ;// Scale = pQPModTable[QP]
SADD16 c0w0, r0w0, r0w1 ;// [ d00+d10, d01+d11 ]
SSUB16 c1w0, r0w0, r0w1 ;// [ d00-d10, d01-d11 ]
LSL Scale, Scale, Shift ;// Scale = Scale << Shift
SMULTB Temp2, c0w0, Scale ;// Temp2 = T(c0w0) * Scale
SMULTB Temp4, c1w0, Scale ;// Temp4 = T(c1w0) * Scale
SMULBB Temp1, c0w0, Scale ;// Temp1 = B(c0w0) * Scale
SMULBB Temp3, c1w0, Scale ;// Temp3 = B(c1w0) * Scale
MOV Temp2, Temp2, ASR #1 ;// Temp2 = Temp2 >> 1 & Temp1 = (Temp1 >> 1) << 16
MOV Temp4, Temp4, ASR #1 ;// Temp4 = Temp4 >> 1 & Temp3 = (Temp3 >> 1) << 16
PKHBT c0w0, Temp2, Temp1, LSL #15 ;// c0w0 = | Temp1 | Temp2 |
PKHBT c1w0, Temp4, Temp3, LSL #15 ;// c1w0 = | Temp3 | Temp4 |
STMIA pDst, {c0w0, c1w0} ;// Storing all the coefficients at once
MOV return, #OMX_Sts_NoErr
M_END
ENDIF ;// ARM1136JS
END
|
