blob: a9cd0089029dbfb8a312b0ebc338f6ab3a09a096 (
plain)
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
|
/**
*
* File Name: armVCM4P2_SetPredDir.c
* OpenMAX DL: v1.0.2
* Revision: 9641
* Date: Thursday, February 7, 2008
*
* (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
*
*
*
* Description:
* Contains module for detecting the prediction direction
*
*/
#include "omxtypes.h"
#include "armOMX.h"
#include "armVC.h"
#include "armCOMM.h"
/**
* Function: armVCM4P2_SetPredDir
*
* Description:
* Performs detecting the prediction direction
*
* Remarks:
*
* Parameters:
* [in] blockIndex block index indicating the component type and
* position as defined in subclause 6.1.3.8, of ISO/IEC
* 14496-2. Furthermore, indexes 6 to 9 indicate the
* alpha blocks spatially corresponding to luminance
* blocks 0 to 3 in the same macroblock.
* [in] pCoefBufRow pointer to the coefficient row buffer
* [in] pQpBuf pointer to the quantization parameter buffer
* [out] predQP quantization parameter of the predictor block
* [out] predDir indicates the prediction direction which takes one
* of the following values:
* OMX_VC_HORIZONTAL predict horizontally
* OMX_VC_VERTICAL predict vertically
*
* Return Value:
* Standard OMXResult result. See enumeration for possible result codes.
*
*/
OMXResult armVCM4P2_SetPredDir(
OMX_INT blockIndex,
OMX_S16 *pCoefBufRow,
OMX_S16 *pCoefBufCol,
OMX_INT *predDir,
OMX_INT *predQP,
const OMX_U8 *pQpBuf
)
{
OMX_U8 blockDCLeft;
OMX_U8 blockDCTop;
OMX_U8 blockDCTopLeft;
if (blockIndex == 3)
{
blockDCTop = *(pCoefBufCol - 8);
}
else
{
blockDCTop = *pCoefBufRow;
}
blockDCLeft = *pCoefBufCol;
blockDCTopLeft = *(pCoefBufRow - 8);
if (armAbs(blockDCLeft - blockDCTopLeft) < armAbs(blockDCTopLeft \
- blockDCTop))
{
*predDir = OMX_VC_VERTICAL;
*predQP = pQpBuf[1];
}
else
{
*predDir = OMX_VC_HORIZONTAL;
*predQP = pQpBuf[0];
}
return OMX_Sts_NoErr;
}
/*End of File*/
|
