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_InvTransformDequant_ChromaDC.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 calculate 4x4 hadamard transform of chroma DC
28 * coefficients and quantization
29 *
30 */
31
32#include "omxtypes.h"
33#include "armOMX.h"
34#include "omxVC.h"
35
36#include "armVC.h"
37#include "armCOMM.h"
38
39/**
40 * Function:  omxVCM4P10_InvTransformDequant_ChromaDC   (6.3.5.6.4)
41 *
42 * Description:
43 * This function performs inverse 2x2 Hadamard transform and then dequantizes
44 * the coefficients.
45 *
46 * Input Arguments:
47 *
48 *   pSrc - Pointer to the 2x2 array of the 2x2 Hadamard-transformed and
49 *            quantized coefficients.  8 byte alignment required.
50 *   iQP - Quantization parameter; must be in the range [0,51].
51 *
52 * Output Arguments:
53 *
54 *   pDst - Pointer to inverse-transformed and dequantized coefficients.
55 *            8-byte alignment required.
56 *
57 * Return Value:
58 *
59 *    OMX_Sts_NoErr - no error
60 *    OMX_Sts_BadArgErr - bad arguments; returned if any of the following
61 *              conditions are true:
62 *    -    at least one of the following pointers is NULL: pSrc
63 *    -    pSrc or pDst is not aligned on an 8-byte boundary
64 *
65 */
66OMXResult omxVCM4P10_InvTransformDequant_ChromaDC(
67	const OMX_S16* 	pSrc,
68	OMX_S16*	pDst,
69	OMX_U32		iQP
70)
71{
72    OMX_INT     i, j;
73    OMX_S32     m[2][2];
74    OMX_S32     QPer, V00, Value;
75
76    /* check for argument error */
77    armRetArgErrIf(pSrc == NULL, OMX_Sts_BadArgErr)
78    armRetArgErrIf(armNot8ByteAligned(pSrc), OMX_Sts_BadArgErr);
79    armRetArgErrIf(pDst == NULL, OMX_Sts_BadArgErr)
80    armRetArgErrIf(armNot8ByteAligned(pDst), OMX_Sts_BadArgErr);
81    armRetArgErrIf(iQP > 51, OMX_Sts_BadArgErr)
82
83    /* Inv Hadamard Transform for 2x2 block */
84    m[0][0] = pSrc[0] + pSrc[1] +  pSrc[2] + pSrc[3];
85    m[0][1] = pSrc[0] - pSrc[1] +  pSrc[2] - pSrc[3];
86    m[1][0] = pSrc[0] + pSrc[1] -  pSrc[2] - pSrc[3];
87    m[1][1] = pSrc[0] - pSrc[1] -  pSrc[2] + pSrc[3];
88
89    /* Quantization */
90    /* Scaling */
91    QPer = iQP / 6;
92    V00 = armVCM4P10_VMatrix [iQP % 6][0];
93
94    for (j = 0; j < 2; j++)
95    {
96        for (i = 0; i < 2; i++)
97        {
98            if (QPer < 1)
99            {
100                Value = (m[j][i] * V00) >> 1;
101            }
102            else
103            {
104                Value = (m[j][i] * V00) << (QPer - 1);
105            }
106
107            pDst[j * 2 + i] = (OMX_S16) Value;
108        }
109    }
110
111    return OMX_Sts_NoErr;
112}
113
114/*****************************************************************************
115 *                              END OF FILE
116 *****************************************************************************/
117
118