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      1 /**
      2  *
      3  * File Name:  omxVCCOMM_Average_16x.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 Average of two 16x16 or 16x8 blocks
     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:  omxVCCOMM_Average_16x   (6.1.3.1.2)
     25  *
     26  * Description:
     27  * This function calculates the average of two 16x16 or 16x8 blocks.  The
     28  * result is rounded according to (a+b+1)/2.  The block average function can
     29  * be used in conjunction with half-pixel interpolation to obtain quarter
     30  * pixel motion estimates, as described in [ISO14496-10], subclause 8.4.2.2.1.
     31  *
     32  * Input Arguments:
     33  *
     34  *   pPred0 - Pointer to the top-left corner of reference block 0
     35  *   pPred1 - Pointer to the top-left corner of reference block 1
     36  *   iPredStep0 - Step of reference block 0
     37  *   iPredStep1 - Step of reference block 1
     38  *   iDstStep - Step of the destination buffer
     39  *   iHeight - Height of the blocks
     40  *
     41  * Output Arguments:
     42  *
     43  *   pDstPred - Pointer to the destination buffer. 16-byte aligned.
     44  *
     45  * Return Value:
     46  *
     47  *    OMX_Sts_NoErr - no error
     48  *    OMX_Sts_BadArgErr - bad arguments; returned under any of the following
     49  *              conditions:
     50  *    -   one or more of the following pointers is NULL: pPred0, pPred1, or
     51  *              pDstPred.
     52  *    -   pDstPred is not aligned on a 16-byte boundary.
     53  *    -   iPredStep0 <= 0 or iPredStep0 is not a multiple of 16.
     54  *    -   iPredStep1 <= 0 or iPredStep1 is not a multiple of 16.
     55  *    -   iDstStep <= 0 or iDstStep is not a multiple of 16.
     56  *    -   iHeight is not 8 or 16.
     57  *
     58  */
     59  OMXResult omxVCCOMM_Average_16x (
     60 	 const OMX_U8* 	    pPred0,
     61 	 const OMX_U8* 	    pPred1,
     62 	 OMX_U32		iPredStep0,
     63 	 OMX_U32		iPredStep1,
     64 	 OMX_U8*		pDstPred,
     65 	 OMX_U32		iDstStep,
     66 	 OMX_U32		iHeight
     67 )
     68 {
     69     /* check for argument error */
     70     armRetArgErrIf(pPred0 == NULL, OMX_Sts_BadArgErr)
     71     armRetArgErrIf(pPred1 == NULL, OMX_Sts_BadArgErr)
     72     armRetArgErrIf(pDstPred == NULL, OMX_Sts_BadArgErr)
     73     armRetArgErrIf((iHeight != 8) && (iHeight != 16), OMX_Sts_BadArgErr)
     74     armRetArgErrIf(armNot16ByteAligned(pDstPred), OMX_Sts_BadArgErr)
     75     armRetArgErrIf((iPredStep0 == 0) || (iPredStep0 & 15), OMX_Sts_BadArgErr)
     76     armRetArgErrIf((iPredStep1 == 0) || (iPredStep1 & 15), OMX_Sts_BadArgErr)
     77     armRetArgErrIf((iDstStep == 0) || (iDstStep & 15), OMX_Sts_BadArgErr)
     78 
     79     return armVCCOMM_Average
     80         (pPred0, pPred1, iPredStep0, iPredStep1, pDstPred, iDstStep, 16, iHeight);
     81 }
     82 
     83 /*****************************************************************************
     84  *                              END OF FILE
     85  *****************************************************************************/
     86 
     87