| /* |
| * 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; |
| } |
| |