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      1 /*
      2  * Copyright (C) 2007-2008 ARM Limited
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  *
     16  */
     17 /**
     18  *
     19  * File Name:  omxVCCOMM_Average_16x.c
     20  * OpenMAX DL: v1.0.2
     21  * Revision:   9641
     22  * Date:       Thursday, February 7, 2008
     23  *
     24  *
     25  *
     26  * Description:
     27  * This function will calculate Average of two 16x16 or 16x8 blocks
     28  *
     29  */
     30 
     31 #include "omxtypes.h"
     32 #include "armOMX.h"
     33 #include "omxVC.h"
     34 
     35 #include "armCOMM.h"
     36 #include "armVC.h"
     37 
     38 /**
     39  * Function:  omxVCCOMM_Average_16x   (6.1.3.1.2)
     40  *
     41  * Description:
     42  * This function calculates the average of two 16x16 or 16x8 blocks.  The
     43  * result is rounded according to (a+b+1)/2.  The block average function can
     44  * be used in conjunction with half-pixel interpolation to obtain quarter
     45  * pixel motion estimates, as described in [ISO14496-10], subclause 8.4.2.2.1.
     46  *
     47  * Input Arguments:
     48  *
     49  *   pPred0 - Pointer to the top-left corner of reference block 0
     50  *   pPred1 - Pointer to the top-left corner of reference block 1
     51  *   iPredStep0 - Step of reference block 0
     52  *   iPredStep1 - Step of reference block 1
     53  *   iDstStep - Step of the destination buffer
     54  *   iHeight - Height of the blocks
     55  *
     56  * Output Arguments:
     57  *
     58  *   pDstPred - Pointer to the destination buffer. 16-byte aligned.
     59  *
     60  * Return Value:
     61  *
     62  *    OMX_Sts_NoErr - no error
     63  *    OMX_Sts_BadArgErr - bad arguments; returned under any of the following
     64  *              conditions:
     65  *    -   one or more of the following pointers is NULL: pPred0, pPred1, or
     66  *              pDstPred.
     67  *    -   pDstPred is not aligned on a 16-byte boundary.
     68  *    -   iPredStep0 <= 0 or iPredStep0 is not a multiple of 16.
     69  *    -   iPredStep1 <= 0 or iPredStep1 is not a multiple of 16.
     70  *    -   iDstStep <= 0 or iDstStep is not a multiple of 16.
     71  *    -   iHeight is not 8 or 16.
     72  *
     73  */
     74  OMXResult omxVCCOMM_Average_16x (
     75 	 const OMX_U8* 	    pPred0,
     76 	 const OMX_U8* 	    pPred1,
     77 	 OMX_U32		iPredStep0,
     78 	 OMX_U32		iPredStep1,
     79 	 OMX_U8*		pDstPred,
     80 	 OMX_U32		iDstStep,
     81 	 OMX_U32		iHeight
     82 )
     83 {
     84     /* check for argument error */
     85     armRetArgErrIf(pPred0 == NULL, OMX_Sts_BadArgErr)
     86     armRetArgErrIf(pPred1 == NULL, OMX_Sts_BadArgErr)
     87     armRetArgErrIf(pDstPred == NULL, OMX_Sts_BadArgErr)
     88     armRetArgErrIf((iHeight != 8) && (iHeight != 16), OMX_Sts_BadArgErr)
     89     armRetArgErrIf(armNot16ByteAligned(pDstPred), OMX_Sts_BadArgErr)
     90     armRetArgErrIf((iPredStep0 == 0) || (iPredStep0 & 15), OMX_Sts_BadArgErr)
     91     armRetArgErrIf((iPredStep1 == 0) || (iPredStep1 & 15), OMX_Sts_BadArgErr)
     92     armRetArgErrIf((iDstStep == 0) || (iDstStep & 15), OMX_Sts_BadArgErr)
     93 
     94     return armVCCOMM_Average
     95         (pPred0, pPred1, iPredStep0, iPredStep1, pDstPred, iDstStep, 16, iHeight);
     96 }
     97 
     98 /*****************************************************************************
     99  *                              END OF FILE
    100  *****************************************************************************/
    101 
    102