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/* ----------------------------------------------------------------
*
*
* File Name: omxVCM4P10_TransformDequantLumaDCFromPair.c
* OpenMAX DL: v1.0.2
* Revision: 9641
* Date: Thursday, February 7, 2008
*
* (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
*
*
*
* H.264 inverse quantize and transform module
*
*/
#include "omxtypes.h"
#include "armOMX.h"
#include "omxVC.h"
#include "armCOMM.h"
#include "armVC.h"
/*
* Description:
* Dequantize Luma DC block
*/
static void DequantLumaDC4x4(
OMX_S16* pDst,
OMX_INT QP
)
{
int Shift = (QP/6)-2 ;
int Scale = armVCM4P10_VMatrix[QP%6][0];
int i, Round, Value;
if (Shift >= 0)
{
for (i=0; i<16; i++)
{
Value = (pDst[i] * Scale) << Shift;
pDst[i] = (OMX_S16)Value;
}
}
else
{
Shift = -Shift;;
Round = 1<<(Shift-1);
for (i=0; i<16; i++)
{
Value = (pDst[i] * Scale + Round) >> Shift;
pDst[i] = (OMX_S16)Value;
}
}
}
/*
* Description:
* Inverse Transform DC 4x4 Coefficients
*/
static void InvTransformDC4x4(OMX_S16* pData)
{
int i;
/* Transform rows */
for (i=0; i<16; i+=4)
{
int c0 = pData[i+0];
int c1 = pData[i+1];
int c2 = pData[i+2];
int c3 = pData[i+3];
pData[i+0] = (OMX_S16)(c0+c1+c2+c3);
pData[i+1] = (OMX_S16)(c0+c1-c2-c3);
pData[i+2] = (OMX_S16)(c0-c1-c2+c3);
pData[i+3] = (OMX_S16)(c0-c1+c2-c3);
}
/* Transform columns */
for (i=0; i<4; i++)
{
int c0 = pData[i+0];
int c1 = pData[i+4];
int c2 = pData[i+8];
int c3 = pData[i+12];
pData[i+0] = (OMX_S16)(c0+c1+c2+c3);
pData[i+4] = (OMX_S16)(c0+c1-c2-c3);
pData[i+8] = (OMX_S16)(c0-c1-c2+c3);
pData[i+12] = (OMX_S16)(c0-c1+c2-c3);
}
}
/**
* Function: omxVCM4P10_TransformDequantLumaDCFromPair (6.3.4.2.1)
*
* Description:
* Reconstructs the 4x4 LumaDC block from the coefficient-position pair
* buffer, performs integer inverse, and dequantization for 4x4 LumaDC
* coefficients, and updates the pair buffer pointer to the next non-empty
* block.
*
* Input Arguments:
*
* ppSrc - Double pointer to residual coefficient-position pair buffer
* output by CALVC decoding
* QP - Quantization parameter QpY
*
* Output Arguments:
*
* ppSrc - *ppSrc is updated to the start of next non empty block
* pDst - Pointer to the reconstructed 4x4 LumaDC coefficients buffer; must
* be aligned on a 8-byte boundary.
*
* Return Value:
* OMX_Sts_NoErr, if the function runs without error.
* OMX_Sts_BadArgErr - bad arguments: if one of the following cases occurs:
* - ppSrc or pDst is NULL.
* - pDst is not 8 byte aligned.
* - QP is not in the range of [0-51].
*
*/
OMXResult omxVCM4P10_TransformDequantLumaDCFromPair(
const OMX_U8 **ppSrc,
OMX_S16* pDst,
OMX_INT QP
)
{
armRetArgErrIf(ppSrc == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf(*ppSrc == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf(pDst == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf(armNot8ByteAligned(pDst), OMX_Sts_BadArgErr);
armRetArgErrIf(QP<0, OMX_Sts_BadArgErr);
armRetArgErrIf(QP>51, OMX_Sts_BadArgErr);
armVCM4P10_UnpackBlock4x4(ppSrc, pDst);
/*InvTransformDequantLumaDC4x4(pDst, QP);*/
InvTransformDC4x4(pDst);
DequantLumaDC4x4(pDst, QP);
return OMX_Sts_NoErr;
}
/* End of file */
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