1/**
2 *
3 * File Name:  omxVCM4P2_BlockMatch_Half_16x16.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 *
12 * Description:
13 * Contains modules for Block matching, a full search algorithm
14 * is implemented
15 *
16 */
17
18#include "omxtypes.h"
19#include "armOMX.h"
20#include "omxVC.h"
21
22#include "armVC.h"
23#include "armCOMM.h"
24
25/**
26 * Function:  omxVCM4P2_BlockMatch_Half_16x16   (6.2.4.2.3)
27 *
28 * Description:
29 * Performs a 16x16 block match with half-pixel resolution.  Returns the
30 * estimated motion vector and associated minimum SAD.  This function
31 * estimates the half-pixel motion vector by interpolating the integer
32 * resolution motion vector referenced by the input parameter pSrcDstMV, i.e.,
33 * the initial integer MV is generated externally.  The input parameters
34 * pSrcRefBuf and pSearchPointRefPos should be shifted by the winning MV of
35 * 16x16 integer search prior to calling BlockMatch_Half_16x16. The function
36 * BlockMatch_Integer_16x16 may be used for integer motion estimation.
37 *
38 * Input Arguments:
39 *
40 *   pSrcRefBuf - pointer to the reference Y plane; points to the reference
41 *            macroblock that corresponds to the location of the current
42 *            macroblock in the current plane.
43 *   refWidth - width of the reference plane
44 *   pRefRect - reference plane valid region rectangle
45 *   pSrcCurrBuf - pointer to the current block in the current macroblock
46 *            buffer extracted from the original plane (linear array, 256
47 *            entries); must be aligned on a 16-byte boundary.  The number of
48 *            bytes between lines (step) is 16.
49 *   pSearchPointRefPos - position of the starting point for half pixel
50 *            search (specified in terms of integer pixel units) in the
51 *            reference plane, i.e., the reference position pointed to by the
52 *            predicted motion vector.
53 *   rndVal - rounding control parameter: 0 - disabled; 1 - enabled.
54 *   pSrcDstMV - pointer to the initial MV estimate; typically generated
55 *            during a prior 16X16 integer search; specified in terms of
56 *            half-pixel units.
57 *
58 * Output Arguments:
59 *
60 *   pSrcDstMV - pointer to estimated MV
61 *   pDstSAD - pointer to minimum SAD
62 *
63 * Return Value:
64 *
65 *    OMX_Sts_NoErr - no error
66 *    OMX_Sts_BadArgErr - bad arguments.  Returned if one of the following
67 *              conditions is true:
68 *    -    at least one of the following pointers is NULL: pSrcRefBuf,
69 *         pRefRect, pSrcCurrBuff, pSearchPointRefPos, pSrcDstMV.
70 *    -    pSrcCurrBuf is not 16-byte aligned, or
71 *
72 */
73
74OMXResult omxVCM4P2_BlockMatch_Half_16x16(
75     const OMX_U8 *pSrcRefBuf,
76     OMX_INT refWidth,
77     const OMXRect *pRefRect,
78     const OMX_U8 *pSrcCurrBuf,
79     const OMXVCM4P2Coordinate *pSearchPointRefPos,
80     OMX_INT rndVal,
81     OMXVCMotionVector *pSrcDstMV,
82     OMX_INT *pDstSAD
83)
84{
85
86    /* For a blocksize of 16x16 */
87    OMX_U8 BlockSize = 16;
88
89    /* Argument error checks */
90    armRetArgErrIf(pSrcRefBuf         == NULL, OMX_Sts_BadArgErr);
91    armRetArgErrIf(pRefRect           == NULL, OMX_Sts_BadArgErr);
92    armRetArgErrIf(pSrcCurrBuf        == NULL, OMX_Sts_BadArgErr);
93    armRetArgErrIf(pSearchPointRefPos == NULL, OMX_Sts_BadArgErr);
94    armRetArgErrIf(pSrcDstMV          == NULL, OMX_Sts_BadArgErr);
95    armRetArgErrIf(!armIs16ByteAligned(pSrcCurrBuf), OMX_Sts_BadArgErr);
96
97    return (armVCM4P2_BlockMatch_Half(
98                                pSrcRefBuf,
99                                refWidth,
100                                pRefRect,
101                                pSrcCurrBuf,
102                                pSearchPointRefPos,
103                                rndVal,
104                                pSrcDstMV,
105                                pDstSAD,
106                                BlockSize));
107
108
109}
110
111/* End of file */
112