1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
|
/*
* Copyright (C) 2007-2008 ARM Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
/**
*
* File Name: omxVCM4P2_DCT8x8blk.c
* OpenMAX DL: v1.0.2
* Revision: 9641
* Date: Thursday, February 7, 2008
*
*
*
*
* Description:
* Contains modules for 8x8 block DCT
*
*/
#include <math.h>
#include "omxtypes.h"
#include "armOMX.h"
#include "armCOMM.h"
#include "armVCM4P2_DCT_Table.h"
/**
* Function: omxVCM4P2_DCT8x8blk (6.2.4.4.1)
*
* Description:
* Computes a 2D forward DCT for a single 8x8 block, as defined in
* [ISO14496-2].
*
* Input Arguments:
*
* pSrc - pointer to the start of the linearly arranged input buffer; must
* be aligned on a 16-byte boundary. Input values (pixel
* intensities) are valid in the range [-255,255].
*
* Output Arguments:
*
* pDst - pointer to the start of the linearly arranged output buffer; must
* be aligned on a 16-byte boundary.
*
* Return Value:
*
* OMX_Sts_NoErr - no error
* OMX_Sts_BadArgErr - bad arguments, returned if:
* - pSrc or pDst is NULL.
* - pSrc or pDst is not 16-byte aligned.
*
*/
OMXResult omxVCM4P2_DCT8x8blk (const OMX_S16 *pSrc, OMX_S16 *pDst)
{
OMX_INT x, y, u, v;
/* Argument error checks */
armRetArgErrIf(pSrc == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf(!armIs16ByteAligned(pSrc), OMX_Sts_BadArgErr);
armRetArgErrIf(pDst == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf(!armIs16ByteAligned(pDst), OMX_Sts_BadArgErr);
for (u = 0; u < 8; u++)
{
for (v = 0; v < 8; v++)
{
OMX_F64 sum = 0.0;
for (x = 0; x < 8; x++)
{
for (y = 0; y < 8; y++)
{
sum += pSrc[(x * 8) + y] *
armVCM4P2_preCalcDCTCos[x][u] *
armVCM4P2_preCalcDCTCos[y][v];
}
}
pDst[(u * 8) + v]= armRoundFloatToS16 (sum);
}
}
return OMX_Sts_NoErr;
}
/* End of file */
|