band_nrg.c revision 891abc0ee089f2ba5b92dcc014e5efc2ef07f01e 
1/*
2 ** Copyright 2003-2010, VisualOn, Inc.
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	File:		band_nrg.c
18
19	Content:	Band/Line energy calculations functions
20
21*******************************************************************************/
22
23#include "basic_op.h"
24#include "band_nrg.h"
25
26#ifndef ARMV5E
27/********************************************************************************
28*
29* function name: CalcBandEnergy
30* description:   Calc sfb-bandwise mdct-energies for left and right channel
31*
32**********************************************************************************/
33void CalcBandEnergy(const Word32 *mdctSpectrum,
34                    const Word16 *bandOffset,
35                    const Word16  numBands,
36                    Word32       *bandEnergy,
37                    Word32       *bandEnergySum)
38{
39  Word32 i, j;
40  Word32 accuSum = 0;
41
42  for (i=0; i<numBands; i++) {
43    Word32 accu = 0;
44    for (j=bandOffset[i]; j<bandOffset[i+1]; j++)
45      accu = L_add(accu, MULHIGH(mdctSpectrum[j], mdctSpectrum[j]));
46
47	accu = L_add(accu, accu);
48    accuSum = L_add(accuSum, accu);
49    bandEnergy[i] = accu;
50  }
51  *bandEnergySum = accuSum;
52}
53
54/********************************************************************************
55*
56* function name: CalcBandEnergyMS
57* description:   Calc sfb-bandwise mdct-energies for left add or minus right channel
58*
59**********************************************************************************/
60void CalcBandEnergyMS(const Word32 *mdctSpectrumLeft,
61                      const Word32 *mdctSpectrumRight,
62                      const Word16 *bandOffset,
63                      const Word16  numBands,
64                      Word32       *bandEnergyMid,
65                      Word32       *bandEnergyMidSum,
66                      Word32       *bandEnergySide,
67                      Word32       *bandEnergySideSum)
68{
69
70  Word32 i, j;
71  Word32 accuMidSum = 0;
72  Word32 accuSideSum = 0;
73
74
75  for(i=0; i<numBands; i++) {
76    Word32 accuMid = 0;
77    Word32 accuSide = 0;
78    for (j=bandOffset[i]; j<bandOffset[i+1]; j++) {
79      Word32 specm, specs;
80      Word32 l, r;
81
82      l = mdctSpectrumLeft[j] >> 1;
83      r = mdctSpectrumRight[j] >> 1;
84      specm = l + r;
85      specs = l - r;
86      accuMid = L_add(accuMid, MULHIGH(specm, specm));
87      accuSide = L_add(accuSide, MULHIGH(specs, specs));
88    }
89
90	accuMid = L_add(accuMid, accuMid);
91	accuSide = L_add(accuSide, accuSide);
92	bandEnergyMid[i] = accuMid;
93    accuMidSum = L_add(accuMidSum, accuMid);
94    bandEnergySide[i] = accuSide;
95    accuSideSum = L_add(accuSideSum, accuSide);
96
97  }
98  *bandEnergyMidSum = accuMidSum;
99  *bandEnergySideSum = accuSideSum;
100}
101
102#endif
103