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/*
* This file is part of AtracDEnc.
*
* AtracDEnc is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* AtracDEnc is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with AtracDEnc; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#pragma once
#include "../qmf/qmf.h"
namespace NAtracDEnc {
template<class TIn>
class Atrac1SplitFilterBank {
const static int nInSamples = 512;
const static int delayComp = 39;
TQmf<TIn, nInSamples> Qmf1;
TQmf<TIn, nInSamples / 2> Qmf2;
std::vector<TFloat> MidLowTmp;
std::vector<TFloat> DelayBuf;
public:
Atrac1SplitFilterBank() {
MidLowTmp.resize(512);
DelayBuf.resize(delayComp + 512);
}
void Split(TIn* pcm, TFloat* low, TFloat* mid, TFloat* hi) {
memcpy(&DelayBuf[0], &DelayBuf[256], sizeof(TFloat) * delayComp);
Qmf1.Split(pcm, &MidLowTmp[0], &DelayBuf[delayComp]);
Qmf2.Split(&MidLowTmp[0], low, mid);
memcpy(hi, &DelayBuf[0], sizeof(TFloat) * 256);
}
};
template<class TOut>
class Atrac1SynthesisFilterBank {
const static int nInSamples = 512;
const static int delayComp = 39;
TQmf<TOut, nInSamples> Qmf1;
TQmf<TOut, nInSamples / 2> Qmf2;
std::vector<TFloat> MidLowTmp;
std::vector<TFloat> DelayBuf;
public:
Atrac1SynthesisFilterBank() {
MidLowTmp.resize(512);
DelayBuf.resize(delayComp + 512);
}
void Synthesis(TOut* pcm, TFloat* low, TFloat* mid, TFloat* hi) {
memcpy(&DelayBuf[0], &DelayBuf[256], sizeof(TFloat) * delayComp);
memcpy(&DelayBuf[delayComp], hi, sizeof(TFloat) * 256);
Qmf2.Merge(&MidLowTmp[0], &low[0], &mid[0]);
Qmf1.Merge(&pcm[0], &MidLowTmp[0], &DelayBuf[0]);
}
};
} //namespace NAtracDEnc
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