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;//
;// 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_QuantInvIntra_I_s.s
; * OpenMAX DL: v1.0.2
; * Revision: 9641
; * Date: Thursday, February 7, 2008
; *
; *
; *
; *
; * Description:
; * Contains modules for inter reconstruction
; *
; *
; *
; *
; *
; *
; * Function: omxVCM4P2_QuantInvIntra_I
; *
; * Description:
; * Performs inverse quantization on intra/inter coded block.
; * This function supports bits_per_pixel = 8. Mismatch control
; * is performed for the first MPEG-4 mode inverse quantization method.
; * The output coefficients are clipped to the range: [-2048, 2047].
; * Mismatch control is performed for the first inverse quantization method.
; *
; * Remarks:
; *
; * Parameters:
; * [in] pSrcDst pointer to the input (quantized) intra/inter block. Must be 16-byte aligned.
; * [in] QP quantization parameter (quantiser_scale)
; * [in] videoComp (Intra version only.) Video component type of the
; * current block. Takes one of the following flags:
; * OMX_VC_LUMINANCE, OMX_VC_CHROMINANCE,
; * OMX_VC_ALPHA.
; * [in] shortVideoHeader a flag indicating presence of short_video_header;
; * shortVideoHeader==1 selects linear intra DC mode,
; * and shortVideoHeader==0 selects nonlinear intra DC mode.
; * [out] pSrcDst pointer to the output (dequantized) intra/inter block. Must be 16-byte aligned.
; *
; * Return Value:
; * OMX_Sts_NoErr - no error
; * OMX_Sts_BadArgErr - bad arguments
; * - If pSrcDst is NULL or is not 16-byte aligned.
; * or
; * - If QP <= 0.
; * or
; * - videoComp is none of OMX_VC_LUMINANCE, OMX_VC_CHROMINANCE and OMX_VC_ALPHA.
; *
INCLUDE omxtypes_s.h
INCLUDE armCOMM_s.h
M_VARIANTS ARM1136JS
IMPORT armVCM4P2_DCScaler
IF ARM1136JS
;//Input Arguments
pSrcDst RN 0
QP RN 1
videoComp RN 2
shortVideoHeader RN 3
;//Local Variables
Return RN 0
dcScaler RN 4
temp RN 12
index RN 6
tempVal21 RN 4
tempVal43 RN 5
QP1 RN 6
X2 RN 7
X3 RN 14
Result1 RN 8
Result2 RN 9
two RN 10
Count RN 11
M_START omxVCM4P2_QuantInvIntra_I,r11
;// Perform Inverse Quantization for DC coefficient
TEQ shortVideoHeader,#0 ;// Test if short Video Header flag =0
MOVNE dcScaler,#8 ;// if shortVideoHeader is non zero dcScaler=8
BNE calDCVal
LDR index, =armVCM4P2_DCScaler
ADD index,index,videoComp,LSL #5
LDRB dcScaler,[index,QP]
;//M_CalDCScalar shortVideoHeader,videoComp, QP
calDCVal
LDRH temp,[pSrcDst]
SMULBB temp,temp,dcScaler ;// dcCoeff = dcScaler * Quantized DC coefficient(from memory)
SSAT temp,#12,temp ;// Saturating to 12 bits
MOV Count,#64
TST QP,#1
LDRD tempVal21,[pSrcDst] ;// Loads first two values of pSrcDst to tempVal21,
;// next two values to tempVal43
SUBEQ QP1,QP,#1 ;// QP1=QP if QP is odd , QP1=QP-1 if QP is even
MOVNE QP1,QP
MOV two,#2
Loop
SMULBB X2,tempVal21,two ;// X2= first val(lower 16 bits of tampVal21)*2
CMP X2,#0
RSBLT X2,X2,#0 ;// X2=absoluteval(first val)
SMLABBNE X2,QP,X2,QP1 ;// X2=2*absval(first val)*QP+QP if QP is odd
;// X2=2*absval(first val)*QP+QP-1 if QP is even
SMULTB X3,tempVal21,two ;// X3= second val(top 16 bits of tampVal21)*2
RSBLT X2,X2,#0
CMP X3,#0
RSBLT X3,X3,#0
SMLABBNE X3,QP,X3,QP1
RSBLT X3,X3,#0
PKHBT Result1,X2,X3,LSL #16 ;// Result1[0-15]=X2[0-15],Result1[16-31]=X3[16-31]
SMULBB X2,tempVal43,two ;// X2= first val(lower 16 bits of tampVal43)*2
SSAT16 Result1,#12,Result1 ;// clip to range [-2048,2047]
CMP X2,#0
RSBLE X2,X2,#0
SMLABBNE X2,QP,X2,QP1
SMULTB X3,tempVal43,two ;// X2= first val(top 16 bits of tampVal21)*2
RSBLT X2,X2,#0
CMP X3,#0
LDRD tempVal21,[pSrcDst,#8] ;// Load next four Values to tempVal21,tempVal43
RSBLT X3,X3,#0
SMLABBNE X3,QP,X3,QP1
RSBLT X3,X3,#0
PKHBT Result2,X2,X3,LSL #16 ;// Result2[0-15]=X2[0-15],Result2[16-31]=X3[16-31]
SSAT16 Result2,#12,Result2 ;// clip to range [-2048,2047]
SUBS Count,Count,#4 ;// Decrement Count by 4 and continue if it has not reached 0
STRD Result1,[pSrcDst],#8 ;// Store Double words and increment the pointer to point the next store address
BGT Loop
SUB pSrcDst,pSrcDst,#128
;// Storing the Inverse Quantized DC coefficient
STRH temp,[pSrcDst],#2
MOV Return,#OMX_Sts_NoErr
M_END
ENDIF
END
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