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/**
*
* File Name: omxVCCOMM_ComputeTextureErrorBlock_SAD.c
* OpenMAX DL: v1.0.2
* Revision: 9641
* Date: Thursday, February 7, 2008
*
* (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
*
*
*
* Description:
* Contains module computing the error for a MB of size 8x8
*
*/
#include "omxtypes.h"
#include "armOMX.h"
#include "omxVC.h"
#include "armCOMM.h"
/**
* Function: omxVCCOMM_ComputeTextureErrorBlock_SAD (6.1.4.1.1)
*
* Description:
* Computes texture error of the block; also returns SAD.
*
* Input Arguments:
*
* pSrc - pointer to the source plane; must be aligned on an 8-byte
* boundary.
* srcStep - step of the source plane
* pSrcRef - pointer to the reference buffer, an 8x8 block; must be aligned
* on an 8-byte boundary.
*
* Output Arguments:
*
* pDst - pointer to the destination buffer, an 8x8 block; must be aligned
* on an 8-byte boundary.
* pDstSAD - pointer to the Sum of Absolute Differences (SAD) value
*
* Return Value:
*
* OMX_Sts_NoErr - no error
* OMX_Sts_BadArgErr - bad arguments
* - At least one of the following
* pointers is NULL: pSrc, pSrcRef, pDst and pDstSAD.
* - pSrc is not 8-byte aligned.
* - SrcStep <= 0 or srcStep is not a multiple of 8.
* - pSrcRef is not 8-byte aligned.
* - pDst is not 8-byte aligned.
*
*/
OMXResult omxVCCOMM_ComputeTextureErrorBlock_SAD(
const OMX_U8 *pSrc,
OMX_INT srcStep,
const OMX_U8 *pSrcRef,
OMX_S16 * pDst,
OMX_INT *pDstSAD
)
{
OMX_INT x, y, count;
/* Argument error checks */
armRetArgErrIf(pSrc == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf(pSrcRef == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf(pDst == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf(pDstSAD == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf(!armIs8ByteAligned(pSrc), OMX_Sts_BadArgErr);
armRetArgErrIf(!armIs8ByteAligned(pSrcRef), OMX_Sts_BadArgErr);
armRetArgErrIf(!armIs8ByteAligned(pDst), OMX_Sts_BadArgErr);
armRetArgErrIf((srcStep <= 0) || (srcStep & 7), OMX_Sts_BadArgErr);
/* Calculate the error block */
for (y = 0, count = 0, *pDstSAD = 0;
y < 8;
y++, pSrc += srcStep)
{
for (x = 0; x < 8; x++, count++)
{
pDst[count] = pSrc[x] - pSrcRef[count];
*pDstSAD += armAbs(pDst[count]);
}
}
return OMX_Sts_NoErr;
}
/* End of file */
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