1/**
2 *
3 * File Name:  omxVCCOMM_ComputeTextureErrorBlock_SAD.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 module computing the error for a MB of size 8x8
14 *
15 */
16#include "omxtypes.h"
17#include "armOMX.h"
18#include "omxVC.h"
19
20#include "armCOMM.h"
21
22
23/**
24 * Function:  omxVCCOMM_ComputeTextureErrorBlock_SAD   (6.1.4.1.1)
25 *
26 * Description:
27 * Computes texture error of the block; also returns SAD.
28 *
29 * Input Arguments:
30 *
31 *   pSrc - pointer to the source plane; must be aligned on an 8-byte
32 *            boundary.
33 *   srcStep - step of the source plane
34 *   pSrcRef - pointer to the reference buffer, an 8x8 block; must be aligned
35 *            on an 8-byte boundary.
36 *
37 * Output Arguments:
38 *
39 *   pDst - pointer to the destination buffer, an 8x8 block; must be aligned
40 *            on an 8-byte boundary.
41 *   pDstSAD - pointer to the Sum of Absolute Differences (SAD) value
42 *
43 * Return Value:
44 *
45 *    OMX_Sts_NoErr - no error
46 *    OMX_Sts_BadArgErr - bad arguments
47 *    -    At least one of the following
48 *         pointers is NULL: pSrc, pSrcRef, pDst and pDstSAD.
49 *    -    pSrc is not 8-byte aligned.
50 *    -    SrcStep <= 0 or srcStep is not a multiple of 8.
51 *    -    pSrcRef is not 8-byte aligned.
52 *    -    pDst is not 8-byte aligned.
53 *
54 */
55
56OMXResult omxVCCOMM_ComputeTextureErrorBlock_SAD(
57     const OMX_U8 *pSrc,
58     OMX_INT srcStep,
59     const OMX_U8 *pSrcRef,
60     OMX_S16 * pDst,
61     OMX_INT *pDstSAD
62)
63{
64
65    OMX_INT     x, y, count;
66
67    /* Argument error checks */
68    armRetArgErrIf(pSrc == NULL, OMX_Sts_BadArgErr);
69    armRetArgErrIf(pSrcRef == NULL, OMX_Sts_BadArgErr);
70    armRetArgErrIf(pDst == NULL, OMX_Sts_BadArgErr);
71    armRetArgErrIf(pDstSAD == NULL, OMX_Sts_BadArgErr);
72    armRetArgErrIf(!armIs8ByteAligned(pSrc), OMX_Sts_BadArgErr);
73    armRetArgErrIf(!armIs8ByteAligned(pSrcRef), OMX_Sts_BadArgErr);
74    armRetArgErrIf(!armIs8ByteAligned(pDst), OMX_Sts_BadArgErr);
75    armRetArgErrIf((srcStep <= 0) || (srcStep & 7), OMX_Sts_BadArgErr);
76
77    /* Calculate the error block */
78    for (y = 0, count = 0, *pDstSAD = 0;
79         y < 8;
80         y++, pSrc += srcStep)
81    {
82        for (x = 0; x < 8; x++, count++)
83        {
84            pDst[count] = pSrc[x] - pSrcRef[count];
85            *pDstSAD += armAbs(pDst[count]);
86        }
87    }
88
89    return OMX_Sts_NoErr;
90
91}
92
93/* End of file */
94