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:  omxVCM4P10_InvTransformResidualAndAdd.c
20 * OpenMAX DL: v1.0.2
21 * Revision:   9641
22 * Date:       Thursday, February 7, 2008
23 *
24 *
25 *
26 * Description:
27 * This function will inverse integer 4x4 transform
28 *
29 */
30
31#include "omxtypes.h"
32#include "armOMX.h"
33#include "omxVC.h"
34
35#include "armCOMM.h"
36#include "armVC.h"
37
38/**
39 * Function:  omxVCM4P10_InvTransformResidualAndAdd   (6.3.5.7.1)
40 *
41 * Description:
42 * This function performs inverse an 4x4 integer transformation to produce
43 * the difference signal and then adds the difference to the prediction to get
44 * the reconstructed signal.
45 *
46 * Input Arguments:
47 *
48 *   pSrcPred - Pointer to prediction signal.  4-byte alignment required.
49 *   pDequantCoeff - Pointer to the transformed coefficients.  8-byte
50 *            alignment required.
51 *   iSrcPredStep - Step of the prediction buffer; must be a multiple of 4.
52 *   iDstReconStep - Step of the destination reconstruction buffer; must be a
53 *            multiple of 4.
54 *   bAC - Indicate whether there is AC coefficients in the coefficients
55 *            matrix.
56 *
57 * Output Arguments:
58 *
59 *   pDstRecon -Pointer to the destination reconstruction buffer.  4-byte
60 *            alignment required.
61 *
62 * Return Value:
63 *
64 *    OMX_Sts_NoErr - no error
65 *    OMX_Sts_BadArgErr - bad arguments; returned if any of the following
66 *              conditions are true:
67 *    -    at least one of the following pointers is NULL:
68 *            pSrcPred, pDequantCoeff, pDstRecon
69 *    -    pSrcPred is not aligned on a 4-byte boundary
70 *    -    iSrcPredStep or iDstReconStep is not a multiple of 4.
71 *    -    pDequantCoeff is not aligned on an 8-byte boundary
72 *
73 */
74OMXResult omxVCM4P10_InvTransformResidualAndAdd(
75	const OMX_U8* 	pSrcPred,
76	const OMX_S16* 	pDequantCoeff,
77	OMX_U8* 	pDstRecon,
78	OMX_U32 	iSrcPredStep,
79	OMX_U32		iDstReconStep,
80	OMX_U8		bAC
81)
82{
83    OMX_INT     i, j;
84    OMX_S16     In[16], Out[16];
85    OMX_S32     Value;
86
87    /* check for argument error */
88    armRetArgErrIf(pSrcPred == NULL, OMX_Sts_BadArgErr)
89    armRetArgErrIf(armNot4ByteAligned(pSrcPred), OMX_Sts_BadArgErr)
90    armRetArgErrIf(pDequantCoeff == NULL, OMX_Sts_BadArgErr)
91    armRetArgErrIf(armNot8ByteAligned(pDequantCoeff), OMX_Sts_BadArgErr)
92    armRetArgErrIf(pDstRecon == NULL, OMX_Sts_BadArgErr)
93    armRetArgErrIf(armNot4ByteAligned(pDstRecon), OMX_Sts_BadArgErr)
94    armRetArgErrIf(bAC > 1, OMX_Sts_BadArgErr)
95    armRetArgErrIf(iSrcPredStep == 0 || iSrcPredStep & 3, OMX_Sts_BadArgErr)
96    armRetArgErrIf(iDstReconStep == 0 || iDstReconStep & 3, OMX_Sts_BadArgErr)
97
98    if (bAC)
99    {
100        for (i = 0; i < 16; i++)
101        {
102            In[i] = pDequantCoeff [i];
103        }
104    }
105    else
106    {
107        /* Copy DC */
108        In[0] = pDequantCoeff [0];
109
110        for (i = 1; i < 16; i++)
111        {
112            In[i] = 0;
113        }
114    }
115
116    /* Residual Transform */
117    armVCM4P10_TransformResidual4x4 (Out, In);
118
119    for (j = 0; j < 4; j++)
120    {
121        for (i = 0; i < 4; i++)
122        {
123            /* Add predition */
124            Value = (OMX_S32) Out [j * 4 + i] + pSrcPred [j * iSrcPredStep + i];
125
126            /* Saturate Value to OMX_U8 */
127            Value = armClip (0, 255, Value);
128
129            pDstRecon[j * iDstReconStep + i] = (OMX_U8) Value;
130        }
131    }
132
133    return OMX_Sts_NoErr;
134}
135
136/*****************************************************************************
137 *                              END OF FILE
138 *****************************************************************************/
139
140