armVCM4P10_FwdTransformResidual4x4.c revision 78e52bfac041d71ce53b5b13c2abf78af742b09d 
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 *
20 * File Name:  armVCM4P10_FwdTransformResidual4x4.c
21 * OpenMAX DL: v1.0.2
22 * Revision:   9641
23 * Date:       Thursday, February 7, 2008
24 *
25 *
26 *
27 *
28 * H.264 transform module
29 *
30 */
31
32#include "omxtypes.h"
33#include "armOMX.h"
34#include "omxVC.h"
35
36#include "armCOMM.h"
37#include "armVC.h"
38
39/*
40 * Description:
41 * Forward Transform Residual 4x4 Coefficients
42 *
43 * Parameters:
44 * [in]  pSrc		Source 4x4 block
45 * [out] pDst		Destination 4x4 block
46 *
47 */
48void armVCM4P10_FwdTransformResidual4x4(OMX_S16* pDst, OMX_S16 *pSrc)
49{
50    int i;
51
52    /* Transform rows */
53    for (i=0; i<16; i+=4)
54    {
55        int d0 = pSrc[i+0];
56        int d1 = pSrc[i+1];
57        int d2 = pSrc[i+2];
58        int d3 = pSrc[i+3];
59        int e0 = d0 + d3;
60        int e1 = d0 - d3;
61        int e2 = d1 + d2;
62        int e3 = d1 - d2;
63        int f0 = e0 + e2;
64        int f1 = (e1 << 1) + e3;
65        int f2 = e0 - e2;
66        int f3 = e1 - (e3 << 1);
67        pDst[i+0] = (OMX_S16)f0;
68        pDst[i+1] = (OMX_S16)f1;
69        pDst[i+2] = (OMX_S16)f2;
70        pDst[i+3] = (OMX_S16)f3;
71    }
72
73    /* Transform columns */
74    for (i=0; i<4; i++)
75    {
76        int f0 = pDst[i+0];
77        int f1 = pDst[i+4];
78        int f2 = pDst[i+8];
79        int f3 = pDst[i+12];
80        int g0 = f0 + f3;
81        int g1 = f0 - f3;
82        int g2 = f1 + f2;
83        int g3 = f1 - f2;
84        int h0 = g0 + g2;
85        int h1 = (g1 << 1) + g3;
86        int h2 = g0 - g2;
87        int h3 = g1 - (g3 << 1);
88        pDst[i+0] = (OMX_S16) h0;
89        pDst[i+4] = (OMX_S16) h1;
90        pDst[i+8] = (OMX_S16) h2;
91        pDst[i+12] = (OMX_S16) h3;
92    }
93}
94