1 /** 2 * 3 * File Name: armVCM4P10_InterpolateHalfHor_Luma.c 4 * OpenMAX DL: v1.0.2 5 * Revision: 9641 6 * Date: Thursday, February 7, 2008 7 * 8 * (c) Copyright 2007-2008 ARM Limited. All Rights Reserved. 9 * 10 * 11 * Description: 12 * This functions will help to calculate Half Pel luma interpolation 13 * 14 */ 15 16 #include "omxtypes.h" 17 #include "armOMX.h" 18 #include "omxVC.h" 19 20 #include "armCOMM.h" 21 #include "armVC.h" 22 23 /** 24 * Function: armVCM4P10_InterpolateHalfHor_Luma 25 * 26 * Description: 27 * This function performs interpolation for horizontal 1/2-pel positions 28 * 29 * Remarks: 30 * 31 * [in] pSrc Pointer to top-left corner of block used to interpolate 32 * in the reconstructed frame plane 33 * [in] iSrcStep Step of the source buffer. 34 * [in] iDstStep Step of the destination(interpolation) buffer. 35 * [in] iWidth Width of the current block 36 * [in] iHeight Height of the current block 37 * [out] pDst Pointer to the interpolation buffer of the 1/2-pel 38 * 39 * Return Value: 40 * Standard OMXResult value. 41 * 42 */ 43 44 OMXResult armVCM4P10_InterpolateHalfHor_Luma( 45 const OMX_U8* pSrc, 46 OMX_U32 iSrcStep, 47 OMX_U8* pDst, 48 OMX_U32 iDstStep, 49 OMX_U32 iWidth, 50 OMX_U32 iHeight 51 ) 52 { 53 OMX_INT x, y; 54 OMX_S32 HalfCoeff, pos; 55 56 /* check for argument error */ 57 armRetArgErrIf(pSrc == NULL, OMX_Sts_BadArgErr) 58 armRetArgErrIf(pDst == NULL, OMX_Sts_BadArgErr) 59 60 for (y = 0; y < iHeight; y++) 61 { 62 for (x = 0; x < iWidth; x++) 63 { 64 pos = y * iSrcStep + x; 65 HalfCoeff = 66 pSrc [pos - 2] - 67 5 * pSrc [pos - 1] + 68 20 * pSrc [pos] + 69 20 * pSrc [pos + 1] - 70 5 * pSrc [pos + 2] + 71 pSrc [pos + 3]; 72 73 HalfCoeff = (HalfCoeff + 16) >> 5; 74 HalfCoeff = armClip(0, 255, HalfCoeff); 75 76 pDst [y * iDstStep + x] = HalfCoeff; 77 } /* x */ 78 } /* y */ 79 80 return OMX_Sts_NoErr; 81 } 82 83
