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