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
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
/**
*
* File Name: omxVCM4P10_BlockMatch_Quarter.c
* OpenMAX DL: v1.0.2
* Revision: 9641
* Date: Thursday, February 7, 2008
*
* (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
*
*
*
* Description:
* Contains modules for quater pel Block matching,
*
*/
#include "omxtypes.h"
#include "armOMX.h"
#include "omxVC.h"
#include "armVC.h"
#include "armCOMM.h"
/**
* Function: omxVCM4P10_BlockMatch_Quarter (6.3.5.2.3)
*
* Description:
* Performs a quarter-pel block match using results from a prior half-pel
* search. Returns the best MV and associated cost. This function estimates
* the quarter-pixel motion vector by interpolating the half-pel resolution
* motion vector referenced by the input parameter pSrcDstBestMV, i.e., the
* initial half-pel MV is generated externally. The function
* omxVCM4P10_BlockMatch_Half may be used for half-pel motion estimation.
*
* Input Arguments:
*
* pSrcOrgY - Pointer to the current position in original picture plane. If
* iBlockWidth==4, 4-byte alignment required. If iBlockWidth==8,
* 8-byte alignment required. If iBlockWidth==16, 16-byte alignment
* required.
* pSrcRefY - Pointer to the top-left corner of the co-located block in the
* reference picture If iBlockWidth==4, 4-byte alignment
* required. If iBlockWidth==8, 8-byte alignment required. If
* iBlockWidth==16, 16-byte alignment required.
* nSrcOrgStep - Stride of the original picture plane in terms of full
* pixels; must be a multiple of iBlockWidth.
* nSrcRefStep - Stride of the reference picture plane in terms of full
* pixels
* iBlockWidth - Width of the current block in terms of full pixels; must
* be equal to either 4, 8, or 16.
* iBlockHeight - Height of the current block in terms of full pixels; must
* be equal to either 4, 8, or 16.
* nLamda - Lamda factor, used to compute motion cost
* pMVPred - Predicted MV, represented in terms of 1/4-pel units; used to
* compute motion cost
* pSrcDstBestMV - The best MV resulting from a prior half-pel search,
* represented in terms of 1/4 pel units
*
* Output Arguments:
*
* pSrcDstBestMV - Best MV resulting from the quarter-pel search, expressed
* in terms of 1/4-pel units
* pBestCost - Motion cost associated with the best MV; computed as
* SAD+Lamda*BitsUsedByMV
*
* Return Value:
* OMX_Sts_NoErr, if the function runs without error.
* OMX_Sts_BadArgErr - bad arguments: if one of the following cases occurs:
* - One of more of the following pointers is NULL:
* pSrcOrgY, pSrcRefY, pSrcDstBestMV, pMVPred, pBestCost
* - iBlockWidth or iBlockHeight are equal to values other than 4, 8, or 16.
* - Any alignment restrictions are violated
*
*/
OMXResult omxVCM4P10_BlockMatch_Quarter(
const OMX_U8* pSrcOrgY,
OMX_S32 nSrcOrgStep,
const OMX_U8* pSrcRefY,
OMX_S32 nSrcRefStep,
OMX_U8 iBlockWidth,
OMX_U8 iBlockHeight,
OMX_U32 nLamda,
const OMXVCMotionVector* pMVPred,
OMXVCMotionVector* pSrcDstBestMV,
OMX_S32* pBestCost
)
{
/* Definitions and Initializations*/
OMX_INT candSAD;
OMX_INT fromX, toX, fromY, toY;
/* Offset to the reference at the begining of the bounding box */
const OMX_U8 *pTempSrcRefY, *pTempSrcOrgY;
OMX_S16 x, y;
OMXVCMotionVector diffMV, candMV, initialMV;
OMX_U8 interpolY[256];
OMX_S32 pelPosX, pelPosY;
/* Argument error checks */
armRetArgErrIf((iBlockWidth == 4) && (!armIs4ByteAligned(pSrcOrgY)), OMX_Sts_BadArgErr);
armRetArgErrIf((iBlockWidth == 8) && (!armIs8ByteAligned(pSrcOrgY)), OMX_Sts_BadArgErr);
armRetArgErrIf((iBlockWidth == 16) && (!armIs16ByteAligned(pSrcOrgY)), OMX_Sts_BadArgErr);
armRetArgErrIf((iBlockWidth == 4) && (!armIs4ByteAligned(pSrcRefY)), OMX_Sts_BadArgErr);
armRetArgErrIf((iBlockWidth == 8) && (!armIs8ByteAligned(pSrcRefY)), OMX_Sts_BadArgErr);
armRetArgErrIf((iBlockWidth == 16) && (!armIs16ByteAligned(pSrcRefY)), OMX_Sts_BadArgErr);
armRetArgErrIf((nSrcOrgStep % iBlockWidth), OMX_Sts_BadArgErr);
armRetArgErrIf(pSrcOrgY == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf(pSrcRefY == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf(pMVPred == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf(pSrcDstBestMV == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf(pBestCost == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf(((iBlockWidth!=4)&&(iBlockWidth!=8)&&(iBlockWidth!=16)) , OMX_Sts_BadArgErr);
armRetArgErrIf(((iBlockHeight!=4)&&(iBlockHeight!=8)&&(iBlockHeight!=16)) , OMX_Sts_BadArgErr);
/* Check for valid region */
fromX = 1;
toX = 1;
fromY = 1;
toY = 1;
/* Initialize to max value as a start point */
*pBestCost = 0x7fffffff;
initialMV.dx = pSrcDstBestMV->dx;
initialMV.dy = pSrcDstBestMV->dy;
/* Looping on y- axis */
for (y = -fromY; y <= toY; y++)
{
/* Looping on x- axis */
for (x = -fromX; x <= toX; x++)
{
/* Positioning the pointer */
pTempSrcRefY = pSrcRefY + (nSrcRefStep * (initialMV.dy/4)) + (initialMV.dx/4);
/* Calculating the fract pel position */
pelPosX = (initialMV.dx % 4) + x;
if (pelPosX < 0)
{
pTempSrcRefY = pTempSrcRefY - 1;
pelPosX += 4;
}
pelPosY = (initialMV.dy % 4) + y;
if (pelPosY < 0)
{
pTempSrcRefY = pTempSrcRefY - (1 * nSrcRefStep);
pelPosY += 4;
}
pTempSrcOrgY = pSrcOrgY;
/* Prepare cand MV */
candMV.dx = initialMV.dx + x;
candMV.dy = initialMV.dy + y;
/* Interpolate Quater pel for the current position*/
armVCM4P10_Interpolate_Luma(
pTempSrcRefY,
nSrcRefStep,
interpolY,
iBlockWidth,
iBlockWidth,
iBlockHeight,
pelPosX,
pelPosY);
/* Calculate the SAD */
armVCCOMM_SAD(
pTempSrcOrgY,
nSrcOrgStep,
interpolY,
iBlockWidth,
&candSAD,
iBlockHeight,
iBlockWidth);
diffMV.dx = candMV.dx - pMVPred->dx;
diffMV.dy = candMV.dy - pMVPred->dy;
/* Result calculations */
armVCM4P10_CompareMotionCostToMV (
candMV.dx,
candMV.dy,
diffMV,
candSAD,
pSrcDstBestMV,
nLamda,
pBestCost);
} /* End of x- axis */
} /* End of y-axis */
return OMX_Sts_NoErr;
}
/* End of file */
|
