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      1 /**
      2  *
      3  * File Name:  armVCM4P10_Interpolate_Chroma.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 function will calculate interpolation for chroma components
     13  *
     14  */
     15 
     16 #include "omxtypes.h"
     17 #include "armOMX.h"
     18 
     19 #include "armCOMM.h"
     20 
     21 /**
     22  * Function: armVCM4P10_Interpolate_Chroma
     23  *
     24  * Description:
     25  * This function performs interpolation for chroma components.
     26  *
     27  * Remarks:
     28  *
     29  *  [in]    pSrc            Pointer to top-left corner of block used to
     30  *                                              interpolate in the reconstructed frame plane
     31  *  [in]    iSrcStep    Step of the source buffer.
     32  *  [in]    iDstStep    Step of the destination(interpolation) buffer.
     33  *  [in]    iWidth      Width of the current block
     34  *  [in]    iHeight     Height of the current block
     35  *  [in]    dx              Fractional part of horizontal motion vector
     36  *                                              component in 1/8 pixel unit (0~7)
     37  *  [in]    dy              Fractional part of vertical motion vector
     38  *                                              component in 1/8 pixel unit (0~7)
     39  *  [out]   pDst            Pointer to the interpolation buffer
     40  *
     41  * Return Value:
     42  * Standard OMXResult value.
     43  *
     44  */
     45  OMXResult armVCM4P10_Interpolate_Chroma(
     46         OMX_U8      *pSrc,
     47         OMX_U32     iSrcStep,
     48         OMX_U8      *pDst,
     49         OMX_U32     iDstStep,
     50         OMX_U32     iWidth,
     51         OMX_U32     iHeight,
     52         OMX_U32     dx,
     53         OMX_U32     dy
     54 )
     55 {
     56     OMX_U32     EightMinusdx = 8 - dx;
     57     OMX_U32     EightMinusdy = 8 - dy;
     58     OMX_U32     ACoeff, BCoeff, CCoeff, DCoeff;
     59     OMX_U32     x, y;
     60 
     61     /* check for argument error */
     62     armRetArgErrIf(pSrc == NULL, OMX_Sts_BadArgErr)
     63     armRetArgErrIf(pDst == NULL, OMX_Sts_BadArgErr)
     64     armRetArgErrIf(dx > 7, OMX_Sts_BadArgErr)
     65     armRetArgErrIf(dy > 7, OMX_Sts_BadArgErr)
     66     armRetArgErrIf(iSrcStep == 0, OMX_Sts_BadArgErr)
     67     armRetArgErrIf(iDstStep == 0, OMX_Sts_BadArgErr)
     68     armRetArgErrIf(iWidth == 0, OMX_Sts_BadArgErr)
     69     armRetArgErrIf(iHeight == 0, OMX_Sts_BadArgErr)
     70 
     71     /* if fractionl mv is not (0, 0) */
     72     if (dx != 0 || dy != 0)
     73     {
     74         ACoeff = EightMinusdx * EightMinusdy;
     75         BCoeff = dx * EightMinusdy;
     76         CCoeff = EightMinusdx * dy;
     77         DCoeff = dx * dy;
     78 
     79         for (y = 0; y < iHeight; y++)
     80         {
     81             for (x = 0; x < iWidth; x++)
     82             {
     83                 pDst [y * iDstStep + x] = (
     84                     ACoeff * pSrc [y * iSrcStep + x] +
     85                     BCoeff * pSrc [y * iSrcStep + x + 1] +
     86                     CCoeff * pSrc [(y + 1) * iSrcStep + x] +
     87                     DCoeff * pSrc [(y + 1) * iSrcStep + x + 1] +
     88                     32) >> 6;
     89             }
     90         }
     91     }
     92     else
     93     {
     94         for (y = 0; y < iHeight; y++)
     95         {
     96             for (x = 0; x < iWidth; x++)
     97             {
     98                 pDst [y * iDstStep + x] = pSrc [y * iSrcStep + x];
     99             }
    100         }
    101     }
    102 
    103     return OMX_Sts_NoErr;
    104 }
    105 
    106 /*****************************************************************************
    107  *                              END OF FILE
    108  *****************************************************************************/
    109 
    110