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/**
*
* File Name: omxVCM4P10_SATD_4x4.c
* OpenMAX DL: v1.0.2
* Revision: 9641
* Date: Thursday, February 7, 2008
*
* (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
*
*
* Description:
* This function will calculate SAD for 4x4 blocks
*
*/
#include "omxtypes.h"
#include "armOMX.h"
#include "omxVC.h"
#include "armCOMM.h"
/**
* Function: omxVCM4P10_SATD_4x4 (6.3.5.4.5)
*
* Description:
* This function calculates the sum of absolute transform differences (SATD)
* for a 4x4 block by applying a Hadamard transform to the difference block
* and then calculating the sum of absolute coefficient values.
*
* Input Arguments:
*
* pSrcOrg - Pointer to the original block; must be aligned on a 4-byte
* boundary
* iStepOrg - Step of the original block buffer; must be a multiple of 4
* pSrcRef - Pointer to the reference block; must be aligned on a 4-byte
* boundary
* iStepRef - Step of the reference block buffer; must be a multiple of 4
*
* Output Arguments:
*
* pDstSAD - pointer to the resulting SAD
*
* Return Value:
*
* OMX_Sts_NoErr - no error
* OMX_Sts_BadArgErr - bad arguments; returned if any of the following
* conditions are true:
* - at least one of the following pointers is NULL:
* pSrcOrg, pSrcRef, or pDstSAD either pSrcOrg
* - pSrcRef is not aligned on a 4-byte boundary
* - iStepOrg <= 0 or iStepOrg is not a multiple of 4
* - iStepRef <= 0 or iStepRef is not a multiple of 4
*
*/
OMXResult omxVCM4P10_SATD_4x4(
const OMX_U8* pSrcOrg,
OMX_U32 iStepOrg,
const OMX_U8* pSrcRef,
OMX_U32 iStepRef,
OMX_U32* pDstSAD
)
{
OMX_INT i, j;
OMX_S32 SATD = 0;
OMX_S32 d [4][4], m1[4][4], m2[4][4];
/* check for argument error */
armRetArgErrIf(pSrcOrg == NULL, OMX_Sts_BadArgErr)
armRetArgErrIf(pSrcRef == NULL, OMX_Sts_BadArgErr)
armRetArgErrIf(pDstSAD == NULL, OMX_Sts_BadArgErr)
armRetArgErrIf((iStepOrg == 0) || (iStepOrg & 3), OMX_Sts_BadArgErr)
armRetArgErrIf((iStepRef == 0) || (iStepRef & 3), OMX_Sts_BadArgErr)
armRetArgErrIf(armNot4ByteAligned(pSrcOrg), OMX_Sts_BadArgErr)
armRetArgErrIf(armNot4ByteAligned(pSrcRef), OMX_Sts_BadArgErr)
/* Calculate the difference */
for (j = 0; j < 4; j++)
{
for (i = 0; i < 4; i++)
{
d [j][i] = pSrcOrg [j * iStepOrg + i] - pSrcRef [j * iStepRef + i];
}
}
/* Hadamard Transfor for 4x4 block */
/* Horizontal */
for (i = 0; i < 4; i++)
{
m1[i][0] = d[i][0] + d[i][2]; /* a+c */
m1[i][1] = d[i][1] + d[i][3]; /* b+d */
m1[i][2] = d[i][0] - d[i][2]; /* a-c */
m1[i][3] = d[i][1] - d[i][3]; /* b-d */
m2[i][0] = m1[i][0] + m1[i][1]; /* a+b+c+d */
m2[i][1] = m1[i][2] + m1[i][3]; /* a+b-c-d */
m2[i][2] = m1[i][2] - m1[i][3]; /* a-b-c+d */
m2[i][3] = m1[i][0] - m1[i][1]; /* a-b+c-d */
}
/* Vertical */
for (i = 0; i < 4; i++)
{
m1[0][i] = m2[0][i] + m2[2][i];
m1[1][i] = m2[1][i] + m2[3][i];
m1[2][i] = m2[0][i] - m2[2][i];
m1[3][i] = m2[1][i] - m2[3][i];
m2[0][i] = m1[0][i] + m1[1][i];
m2[1][i] = m1[2][i] + m1[3][i];
m2[2][i] = m1[2][i] - m1[3][i];
m2[3][i] = m1[0][i] - m1[1][i];
}
/* calculate SAD for Transformed coefficients */
for (j = 0; j < 4; j++)
{
for (i = 0; i < 4; i++)
{
SATD += armAbs(m2 [j][i]);
}
}
*pDstSAD = (SATD + 1) / 2;
return OMX_Sts_NoErr;
}
/*****************************************************************************
* END OF FILE
*****************************************************************************/
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