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/**
*
* File Name: armVCM4P10_InterpolateHalfDiag_Luma.c
* OpenMAX DL: v1.0.2
* Revision: 9641
* Date: Thursday, February 7, 2008
*
* (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
*
*
* Description:
* This functions will help to calculate Half Pel luma interpolation
*
*/
#include "omxtypes.h"
#include "armOMX.h"
#include "omxVC.h"
#include "armCOMM.h"
#include "armVC.h"
/**
* Function: armVCM4P10_InterpolateHalfDiag_Luma
*
* Description:
* This function performs interpolation for (1/2, 1/2) positions
* around a full-pel position.
*
* Remarks:
*
* [in] pSrc Pointer to top-left corner of block used to interpolate
* in the reconstructed frame plane
* [in] iSrcStep Step of the source buffer.
* [in] iDstStep Step of the destination(interpolation) buffer.
* [in] iWidth Width of the current block
* [in] iHeight Height of the current block
* [out] pDst Pointer to the interpolation buffer of the (1/2,1/2)-pel
*
* Return Value:
* Standard OMXResult value.
*
*/
OMXResult armVCM4P10_InterpolateHalfDiag_Luma(
const OMX_U8* pSrc,
OMX_U32 iSrcStep,
OMX_U8* pDst,
OMX_U32 iDstStep,
OMX_U32 iWidth,
OMX_U32 iHeight
)
{
OMX_S32 HalfCoeff, pos;
OMX_S16 Buf [21 * 16]; /* 21 rows by 16 pixels per row */
OMX_U32 y, x;
/* check for argument error */
armRetArgErrIf(pSrc == NULL, OMX_Sts_BadArgErr)
armRetArgErrIf(pDst == NULL, OMX_Sts_BadArgErr)
/*
* Intermediate values will be 1/2 pel at Horizontal direction
* Starting at (0.5, -2) at top extending to (0.5, height + 3) at bottom
* Buf contains a 2D array of size (iWidth)X(iHeight + 5)
*/
for (y = 0; y < iHeight + 5; y++)
{
for (x = 0; x < iWidth; x++)
{
pos = (y-2) * iSrcStep + x;
HalfCoeff =
pSrc [pos - 2] -
5 * pSrc [pos - 1] +
20 * pSrc [pos] +
20 * pSrc [pos + 1] -
5 * pSrc [pos + 2] +
pSrc [pos + 3];
Buf [y * iWidth + x] = (OMX_S16)HalfCoeff;
} /* x */
} /* y */
/* Vertical interpolate */
for (y = 0; y < iHeight; y++)
{
for (x = 0; x < iWidth; x++)
{
pos = y * iWidth + x;
HalfCoeff =
Buf [pos] -
5 * Buf [pos + 1 * iWidth] +
20 * Buf [pos + 2 * iWidth] +
20 * Buf [pos + 3 * iWidth] -
5 * Buf [pos + 4 * iWidth] +
Buf [pos + 5 * iWidth];
HalfCoeff = (HalfCoeff + 512) >> 10;
HalfCoeff = armClip(0, 255, HalfCoeff);
pDst [y * iDstStep + x] = (OMX_U8) HalfCoeff;
}
}
return OMX_Sts_NoErr;
}
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