armVCM4P10_TransformResidual4x4.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_TransformResidual4x4.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 * Transform Residual 4x4 Coefficients
42 *
43 * Parameters:
44 * [in]  pSrc		Source 4x4 block
45 * [out] pDst		Destination 4x4 block
46 *
47 */
48
49void armVCM4P10_TransformResidual4x4(OMX_S16* pDst, OMX_S16 *pSrc)
50{
51    int i;
52
53    /* Transform rows */
54    for (i=0; i<16; i+=4)
55    {
56        int d0 = pSrc[i+0];
57        int d1 = pSrc[i+1];
58        int d2 = pSrc[i+2];
59        int d3 = pSrc[i+3];
60        int e0 = d0 + d2;
61        int e1 = d0 - d2;
62        int e2 = (d1>>1) - d3;
63        int e3 = d1 + (d3>>1);
64        int f0 = e0 + e3;
65        int f1 = e1 + e2;
66        int f2 = e1 - e2;
67        int f3 = e0 - e3;
68        pDst[i+0] = (OMX_S16)f0;
69        pDst[i+1] = (OMX_S16)f1;
70        pDst[i+2] = (OMX_S16)f2;
71        pDst[i+3] = (OMX_S16)f3;
72    }
73
74    /* Transform columns */
75    for (i=0; i<4; i++)
76    {
77        int f0 = pDst[i+0];
78        int f1 = pDst[i+4];
79        int f2 = pDst[i+8];
80        int f3 = pDst[i+12];
81        int g0 = f0 + f2;
82        int g1 = f0 - f2;
83        int g2 = (f1>>1) - f3;
84        int g3 = f1 + (f3>>1);
85        int h0 = g0 + g3;
86        int h1 = g1 + g2;
87        int h2 = g1 - g2;
88        int h3 = g0 - g3;
89        pDst[i+0] = (OMX_S16)((h0+32)>>6);
90        pDst[i+4] = (OMX_S16)((h1+32)>>6);
91        pDst[i+8] = (OMX_S16)((h2+32)>>6);
92        pDst[i+12] = (OMX_S16)((h3+32)>>6);
93    }
94}
95
96