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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
*/
#include "atrac_scale.h"
#include "atrac1.h"
#include "atrac3.h"
#include <cmath>
#include <iostream>
#include <algorithm>
namespace NAtracDEnc {
using std::vector;
using std::map;
using std::cerr;
using std::endl;
using std::abs;
static const TFloat MAX_SCALE = 1.0;
template<class TBaseData>
TScaledBlock TScaler<TBaseData>::Scale(const TFloat* in, uint16_t len) {
TFloat maxAbsSpec = 0;
for (uint16_t i = 0; i < len; ++i) {
const TFloat absSpec = abs(in[i]);
if (absSpec > maxAbsSpec) {
maxAbsSpec = absSpec;
}
}
if (maxAbsSpec > MAX_SCALE) {
cerr << "Scale error: absSpec > MAX_SCALE, val: " << maxAbsSpec << endl;
maxAbsSpec = MAX_SCALE;
}
const map<TFloat, uint8_t>::const_iterator scaleIter = ScaleIndex.lower_bound(maxAbsSpec);
const TFloat scaleFactor = scaleIter->first;
const uint8_t scaleFactorIndex = scaleIter->second;
TScaledBlock res(scaleFactorIndex);
for (uint16_t i = 0; i < len; ++i) {
TFloat scaledValue = in[i] / scaleFactor;
if (abs(scaledValue) >= 1.0) {
cerr << "got "<< scaledValue << " it is wrong scalling" << endl;
scaledValue = (scaledValue > 0) ? 0.99999 : -0.99999;
}
res.Values.push_back(scaledValue);
}
return res;
}
template<class TBaseData>
vector<TScaledBlock> TScaler<TBaseData>::ScaleFrame(const vector<TFloat>& specs, const TBlockSize& blockSize) {
vector<TScaledBlock> scaledBlocks;
scaledBlocks.reserve(TBaseData::MaxBfus);
for (uint8_t bandNum = 0; bandNum < this->NumQMF; ++bandNum) {
const bool shortWinMode = !!blockSize.LogCount[bandNum];
for (uint8_t blockNum = this->BlocksPerBand[bandNum]; blockNum < this->BlocksPerBand[bandNum + 1]; ++blockNum) {
const uint16_t specNumStart = shortWinMode ? TBaseData::SpecsStartShort[blockNum] :
TBaseData::SpecsStartLong[blockNum];
scaledBlocks.emplace_back(Scale(&specs[specNumStart], this->SpecsPerBlock[blockNum]));
}
}
return scaledBlocks;
}
template
class TScaler<NAtrac1::TAtrac1Data>;
template
class TScaler<NAtrac3::TAtrac3Data>;
} //namespace NAtracDEnc
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