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
|
/**
*
* File Name: armVCM4P10_InterpolateHalfHor_Luma.c
* OpenMAX DL: v1.0.2
* Revision: 9641
* Date: Thursday, February 7, 2008
*
* (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
*
*
* Description:
* This functions will help to calculate Half Pel luma interpolation
*
*/
#include "omxtypes.h"
#include "armOMX.h"
#include "omxVC.h"
#include "armCOMM.h"
#include "armVC.h"
/**
* Function: armVCM4P10_InterpolateHalfHor_Luma
*
* Description:
* This function performs interpolation for horizontal 1/2-pel positions
*
* Remarks:
*
* [in] pSrc Pointer to top-left corner of block used to interpolate
* in the reconstructed frame plane
* [in] iSrcStep Step of the source buffer.
* [in] iDstStep Step of the destination(interpolation) buffer.
* [in] iWidth Width of the current block
* [in] iHeight Height of the current block
* [out] pDst Pointer to the interpolation buffer of the 1/2-pel
*
* Return Value:
* Standard OMXResult value.
*
*/
OMXResult armVCM4P10_InterpolateHalfHor_Luma(
const OMX_U8* pSrc,
OMX_U32 iSrcStep,
OMX_U8* pDst,
OMX_U32 iDstStep,
OMX_U32 iWidth,
OMX_U32 iHeight
)
{
OMX_INT x, y;
OMX_S32 HalfCoeff, pos;
/* check for argument error */
armRetArgErrIf(pSrc == NULL, OMX_Sts_BadArgErr)
armRetArgErrIf(pDst == NULL, OMX_Sts_BadArgErr)
for (y = 0; y < iHeight; y++)
{
for (x = 0; x < iWidth; x++)
{
pos = y * iSrcStep + x;
HalfCoeff =
pSrc [pos - 2] -
5 * pSrc [pos - 1] +
20 * pSrc [pos] +
20 * pSrc [pos + 1] -
5 * pSrc [pos + 2] +
pSrc [pos + 3];
HalfCoeff = (HalfCoeff + 16) >> 5;
HalfCoeff = armClip(0, 255, HalfCoeff);
pDst [y * iDstStep + x] = HalfCoeff;
} /* x */
} /* y */
return OMX_Sts_NoErr;
}
|
