omxVCCOMM_ComputeTextureErrorBlock.c revision 78e52bfac041d71ce53b5b13c2abf78af742b09d 
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_ComputeTextureErrorBlock.c
20 * OpenMAX DL: v1.0.2
21 * Revision:   9641
22 * Date:       Thursday, February 7, 2008
23 *
24 *
25 *
26 *
27 * Description:
28 * Contains module computing the error for a MB of size 8x8
29 *
30 */
31
32#include "omxtypes.h"
33#include "armOMX.h"
34#include "omxVC.h"
35#include "armCOMM.h"
36
37/**
38 * Function:  omxVCCOMM_ComputeTextureErrorBlock   (6.1.4.1.2)
39 *
40 * Description:
41 * Computes the texture error of the block.
42 *
43 * Input Arguments:
44 *
45 *   pSrc - pointer to the source plane. This should be aligned on an 8-byte
46 *            boundary.
47 *   srcStep - step of the source plane
48 *   pSrcRef - pointer to the reference buffer, an 8x8 block. This should be
49 *            aligned on an 8-byte boundary.
50 *
51 * Output Arguments:
52 *
53 *   pDst - pointer to the destination buffer, an 8x8 block. This should be
54 *            aligned on an 8-byte boundary.
55 *
56 * Return Value:
57 *
58 *    OMX_Sts_NoErr - no error
59 *    OMX_Sts_BadArgErr - bad arguments:
60 *    -    At least one of the following pointers is NULL:
61 *         pSrc, pSrcRef, pDst.
62 *    -    pSrc is not 8-byte aligned.
63 *    -    SrcStep <= 0 or srcStep is not a multiple of 8.
64 *    -    pSrcRef is not 8-byte aligned.
65 *    -    pDst is not 8-byte aligned
66 *
67 */
68
69OMXResult omxVCCOMM_ComputeTextureErrorBlock(
70     const OMX_U8 *pSrc,
71     OMX_INT srcStep,
72     const OMX_U8 *pSrcRef,
73     OMX_S16 * pDst
74)
75{
76
77    OMX_INT     x, y, count;
78
79    /* Argument error checks */
80    armRetArgErrIf(pSrc == NULL, OMX_Sts_BadArgErr);
81    armRetArgErrIf(pSrcRef == NULL, OMX_Sts_BadArgErr);
82    armRetArgErrIf(pDst == NULL, OMX_Sts_BadArgErr);
83    armRetArgErrIf(!armIs8ByteAligned(pSrc), OMX_Sts_BadArgErr);
84    armRetArgErrIf(!armIs8ByteAligned(pSrcRef), OMX_Sts_BadArgErr);
85    armRetArgErrIf(!armIs8ByteAligned(pDst), OMX_Sts_BadArgErr);
86    armRetArgErrIf((srcStep <= 0) || (srcStep & 7), OMX_Sts_BadArgErr);
87
88    /* Calculate the error block */
89    for (y = 0, count = 0;
90         y < 8;
91         y++, pSrc += srcStep)
92    {
93        for (x = 0; x < 8; x++, count++)
94        {
95            pDst[count] = pSrc[x] - pSrcRef[count];
96        }
97    }
98
99    return OMX_Sts_NoErr;
100
101}
102
103/* End of file */
104