omxVCCOMM_ComputeTextureErrorBlock.c revision 0c1bc742181ded4930842b46e9507372f0b1b963 
1/**
2 *
3 * File Name:  omxVCCOMM_ComputeTextureErrorBlock.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
17#include "omxtypes.h"
18#include "armOMX.h"
19#include "omxVC.h"
20#include "armCOMM.h"
21
22/**
23 * Function:  omxVCCOMM_ComputeTextureErrorBlock   (6.1.4.1.2)
24 *
25 * Description:
26 * Computes the texture error of the block.
27 *
28 * Input Arguments:
29 *
30 *   pSrc - pointer to the source plane. This should be aligned on an 8-byte
31 *            boundary.
32 *   srcStep - step of the source plane
33 *   pSrcRef - pointer to the reference buffer, an 8x8 block. This should be
34 *            aligned on an 8-byte boundary.
35 *
36 * Output Arguments:
37 *
38 *   pDst - pointer to the destination buffer, an 8x8 block. This should be
39 *            aligned on an 8-byte boundary.
40 *
41 * Return Value:
42 *
43 *    OMX_Sts_NoErr - no error
44 *    OMX_Sts_BadArgErr - bad arguments:
45 *    -    At least one of the following pointers is NULL:
46 *         pSrc, pSrcRef, pDst.
47 *    -    pSrc is not 8-byte aligned.
48 *    -    SrcStep <= 0 or srcStep is not a multiple of 8.
49 *    -    pSrcRef is not 8-byte aligned.
50 *    -    pDst is not 8-byte aligned
51 *
52 */
53
54OMXResult omxVCCOMM_ComputeTextureErrorBlock(
55     const OMX_U8 *pSrc,
56     OMX_INT srcStep,
57     const OMX_U8 *pSrcRef,
58     OMX_S16 * pDst
59)
60{
61
62    OMX_INT     x, y, count;
63
64    /* Argument error checks */
65    armRetArgErrIf(pSrc == NULL, OMX_Sts_BadArgErr);
66    armRetArgErrIf(pSrcRef == NULL, OMX_Sts_BadArgErr);
67    armRetArgErrIf(pDst == NULL, OMX_Sts_BadArgErr);
68    armRetArgErrIf(!armIs8ByteAligned(pSrc), OMX_Sts_BadArgErr);
69    armRetArgErrIf(!armIs8ByteAligned(pSrcRef), OMX_Sts_BadArgErr);
70    armRetArgErrIf(!armIs8ByteAligned(pDst), OMX_Sts_BadArgErr);
71    armRetArgErrIf((srcStep <= 0) || (srcStep & 7), OMX_Sts_BadArgErr);
72
73    /* Calculate the error block */
74    for (y = 0, count = 0;
75         y < 8;
76         y++, pSrc += srcStep)
77    {
78        for (x = 0; x < 8; x++, count++)
79        {
80            pDst[count] = pSrc[x] - pSrcRef[count];
81        }
82    }
83
84    return OMX_Sts_NoErr;
85
86}
87
88/* End of file */
89