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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 "config.h"
#include "pcmengin.h"
#include "aea.h"
#include "atrac/atrac3.h"
#include "atrac/atrac3_qmf.h"
#include "transient_detector.h"
#include "delay_buffer.h"
#include "util.h"
#include "atrac/atrac3_bitstream.h"
#include "atrac/atrac_scale.h"
#include "lib/mdct/mdct.h"
#include "gain_processor.h"
#include <algorithm>
#include <functional>
#include <array>
#include <cmath>
namespace NAtracDEnc {
///////////////////////////////////////////////////////////////////////////////
inline uint16_t RelationToIdx(TFloat x) {
if (x <= 0.5) {
x = 1.0 / std::max(x, (TFloat)0.00048828125);
return 4 + GetFirstSetBit((int32_t)std::trunc(x));
} else {
x = std::min(x, (TFloat)16.0);
return 4 - GetFirstSetBit((int32_t)std::trunc(x));
}
}
///////////////////////////////////////////////////////////////////////////////
class TAtrac3MDCT {
using TAtrac3Data = NAtrac3::TAtrac3Data;
NMDCT::TMDCT<512> Mdct512;
NMDCT::TMIDCT<512> Midct512;
public:
typedef TGainProcessor<TAtrac3Data> TAtrac3GainProcessor;
TAtrac3GainProcessor GainProcessor;
TAtrac3MDCT()
: Mdct512(1)
{}
public:
using TGainModulator = TAtrac3GainProcessor::TGainModulator;
using TGainDemodulator = TAtrac3GainProcessor::TGainDemodulator;
typedef std::array<TGainDemodulator, 4> TGainDemodulatorArray;
typedef std::array<TGainModulator, 4> TGainModulatorArray;
void Mdct(TFloat specs[1024],
TFloat* bands[4],
TFloat maxLevels[4],
TGainModulatorArray gainModulators);
void Mdct(TFloat specs[1024],
TFloat* bands[4],
TGainModulatorArray gainModulators = TGainModulatorArray());
void Midct(TFloat specs[1024],
TFloat* bands[4],
TGainDemodulatorArray gainDemodulators = TGainDemodulatorArray());
protected:
TAtrac3MDCT::TGainModulatorArray MakeGainModulatorArray(const TAtrac3Data::SubbandInfo& si);
};
class TAtrac3Encoder : public IProcessor<TFloat>, public TAtrac3MDCT {
using TAtrac3Data = NAtrac3::TAtrac3Data;
TCompressedOutputPtr Oma;
const NAtrac3::TAtrac3EncoderSettings Params;
const std::vector<float> LoudnessCurve;
TDelayBuffer<TFloat, 8, 256> PcmBuffer; //8 = 2 channels * 4 bands
TFloat PrevPeak[2][4]; //2 channel, 4 band - peak level (after windowing), used to check overflow during scalling
Atrac3AnalysisFilterBank<TFloat> AnalysisFilterBank[2];
TScaler<TAtrac3Data> Scaler;
std::vector<NAtrac3::TAtrac3BitStreamWriter::TSingleChannelElement> SingleChannelElements;
public:
struct TTransientParam {
int32_t Attack0Location; // Attack position relative to previous frame
TFloat Attack0Relation;
int32_t Attack1Location; // Attack position relative to previous sample
TFloat Attack1Relation;
int32_t ReleaseLocation;
TFloat ReleaseRelation;
};
private:
std::vector<std::vector<TTransientParam>> TransientParamsHistory;
static constexpr float LoudFactor = 0.006;
float Loudness = LoudFactor;
#ifdef ATRAC_UT_PUBLIC
public:
#endif
TFloat LimitRel(TFloat x);
TTransientParam CalcTransientParam(const std::vector<TFloat>& gain, TFloat lastMax);
void CreateSubbandInfo(TFloat* in[4], uint32_t channel,
TAtrac3Data::SubbandInfo* subbandInfo);
void ResetTransientParamsHistory(int channel, int band);
void SetTransientParamsHistory(int channel, int band, const TTransientParam& params);
const TTransientParam& GetTransientParamsHistory(int channel, int band) const;
void Matrixing();
public:
TAtrac3Encoder(TCompressedOutputPtr&& oma, NAtrac3::TAtrac3EncoderSettings&& encoderSettings);
~TAtrac3Encoder();
TPCMEngine<TFloat>::TProcessLambda GetLambda() override;
};
}
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