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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: armVCM4P10_InterpolateHalfVer_Luma.c
* OpenMAX DL: v1.0.2
* Revision: 9641
* Date: Thursday, February 7, 2008
*
*
*
* 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_InterpolateHalfVer_Luma
*
* Description:
* This function performs interpolation for vertical 1/2-pel 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-pel
*
* Return Value:
* Standard OMXResult value.
*
*/
OMXResult armVCM4P10_InterpolateHalfVer_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_INT y, x;
/* check for argument error */
armRetArgErrIf(pSrc == NULL, OMX_Sts_BadArgErr)
armRetArgErrIf(pDst == NULL, OMX_Sts_BadArgErr)
for (y = 0; y < iHeight; y++)
{
for (x = 0; x < iWidth; x++)
{
pos = y * iSrcStep + x;
HalfCoeff =
pSrc [pos - 2 * iSrcStep] -
5 * pSrc [pos - 1 * iSrcStep] +
20 * pSrc [pos] +
20 * pSrc [pos + 1 * iSrcStep] -
5 * pSrc [pos + 2 * iSrcStep] +
pSrc [pos + 3 * iSrcStep];
HalfCoeff = (HalfCoeff + 16) >> 5;
HalfCoeff = armClip(0, 255, HalfCoeff);
pDst [y * iDstStep + x] = (OMX_U8) HalfCoeff;
}
}
return OMX_Sts_NoErr;
}
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