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#include "atrac3denc.h"
#include "transient_detector.h"
#include "util.h"
#include <assert.h>
#include <algorithm>
#include <iostream>
#include <cmath>
namespace NAtracDEnc {
using namespace NMDCT;
using namespace NAtrac3;
using std::vector;
void TAtrac3MDCT::Mdct(TFloat specs[1024], TFloat* bands[4], TGainModulatorArray gainModulators) {
for (int band = 0; band < 4; ++band) {
TFloat* srcBuff = bands[band];
TFloat* const curSpec = &specs[band*256];
TGainModulator modFn = gainModulators[band];
vector<TFloat> tmp(512);
memcpy(&tmp[0], &srcBuff[256], 256 * sizeof(TFloat));
if (modFn) {
modFn(tmp.data(), srcBuff);
}
for (int i = 0; i < 256; i++) {
srcBuff[256+i] = TAtrac3Data::EncodeWindow[i] * srcBuff[i];
srcBuff[i] = TAtrac3Data::EncodeWindow[255-i] * srcBuff[i];
}
memcpy(&tmp[256], &srcBuff[0], 256 * sizeof(TFloat));
const vector<TFloat>& sp = Mdct512(&tmp[0]);
assert(sp.size() == 256);
memcpy(curSpec, sp.data(), 256 * sizeof(TFloat));
if (band & 1) {
SwapArray(curSpec, 256);
}
}
}
void TAtrac3MDCT::Midct(TFloat specs[1024], TFloat* bands[4], TGainDemodulatorArray gainDemodulators) {
for (int band = 0; band < 4; ++band) {
TFloat* dstBuff = bands[band];
TFloat* curSpec = &specs[band*256];
TFloat* prevBuff = dstBuff + 256;
TAtrac3GainProcessor::TGainDemodulator demodFn = gainDemodulators[band];
if (band & 1) {
SwapArray(curSpec, 256);
}
vector<TFloat> inv = Midct512(curSpec);
assert(inv.size()/2 == 256);
for (int j = 0; j < 256; ++j) {
inv[j] *= /*2 */ DecodeWindow[j];
inv[511 - j] *= /*2*/ DecodeWindow[j];
}
if (demodFn) {
demodFn(dstBuff, inv.data(), prevBuff);
} else {
for (uint32_t j = 0; j < 256; ++j) {
dstBuff[j] = inv[j] + prevBuff[j];
}
}
memcpy(prevBuff, &inv[256], sizeof(TFloat)*256);
}
}
TAtrac3Processor::TAtrac3Processor(TCompressedIOPtr&& oma, TAtrac3EncoderSettings&& encoderSettings)
: Oma(std::move(oma))
, Params(std::move(encoderSettings))
, TransientDetectors(2 * 4, TTransientDetector(8, 256)) //2 - channels, 4 - bands
{}
TAtrac3Processor::~TAtrac3Processor()
{}
TAtrac3MDCT::TGainModulatorArray TAtrac3MDCT::MakeGainModulatorArray(const TAtrac3Data::SubbandInfo& si) {
switch (si.GetQmfNum()) {
case 1:
{
return {{ GainProcessor.Modulate(si.GetGainPoints(0)), TAtrac3MDCT::TGainModulator(),
TAtrac3MDCT::TGainModulator(), TAtrac3MDCT::TGainModulator() }};
}
case 2:
{
return {{ GainProcessor.Modulate(si.GetGainPoints(0)), GainProcessor.Modulate(si.GetGainPoints(1)),
TAtrac3MDCT::TGainModulator(), TAtrac3MDCT::TGainModulator() }};
}
case 3:
{
return {{ GainProcessor.Modulate(si.GetGainPoints(0)), GainProcessor.Modulate(si.GetGainPoints(1)),
GainProcessor.Modulate(si.GetGainPoints(2)), TAtrac3MDCT::TGainModulator() }};
}
case 4:
{
return {{ GainProcessor.Modulate(si.GetGainPoints(0)), GainProcessor.Modulate(si.GetGainPoints(1)),
GainProcessor.Modulate(si.GetGainPoints(2)), GainProcessor.Modulate(si.GetGainPoints(3)) }};
}
default:
assert(false);
return {};
}
}
//TODO:
TAtrac3Data::TTonalComponents TAtrac3Processor::ExtractTonalComponents(TFloat* specs, TTonalDetector fn) {
TAtrac3Data::TTonalComponents res;
const float thresholds[TAtrac3Data::NumQMF] = { 0.9, 2.4, 2.8, 3.2 };
for (uint8_t bandNum = 0; bandNum < this->NumQMF; ++bandNum) {
//disable for frequence above 16KHz until we works without proper psy
if (bandNum > 2)
continue;
for (uint8_t blockNum = BlocksPerBand[bandNum]; blockNum < BlocksPerBand[bandNum + 1]; ++blockNum) {
const uint16_t specNumStart = SpecsStartLong[blockNum];
const uint16_t specNumEnd = specNumStart + SpecsPerBlock[blockNum];
float level = fn(specs + specNumStart, SpecsPerBlock[blockNum]);
if (!isnan(level)) {
for (uint16_t n = specNumStart; n < specNumEnd; ++n) {
//TODO:
TFloat absValue = std::abs(specs[n]);
if (absValue > 65535.0) {
TFloat shift = (specs[n] > 0) ? 65535.0 : -65535.0;
std::cerr << "shift overflowed value " << specs[n] << " " << specs[n] - shift << " " << shift << std::endl;
res.push_back({n, specs[n] - shift});
specs[n] = shift;
} else if (log10(std::abs(specs[n])) - log10(level) > thresholds[bandNum]) {
res.push_back({n, specs[n]/* - level*/});
specs[n] = 0;//level;
}
}
}
}
}
return res;
}
std::vector<TTonalComponent> TAtrac3Processor::MapTonalComponents(const TTonalComponents& tonalComponents) {
vector<TTonalComponent> componentMap;
for (uint16_t i = 0; i < tonalComponents.size();) {
const uint16_t startPos = i;
uint16_t curPos;
do {
curPos = tonalComponents[i].Pos;
++i;
} while ( i < tonalComponents.size() && tonalComponents[i].Pos == curPos + 1 && i - startPos < 7);
const uint16_t len = i - startPos;
TFloat tmp[8];
for (uint8_t j = 0; j < len; ++j)
tmp[j] = tonalComponents[startPos + j].Val;
const TScaledBlock& scaledBlock = Scaler.Scale(tmp, len);
componentMap.push_back({&tonalComponents[startPos], 7, scaledBlock});
}
return componentMap;
}
TAtrac3Data::SubbandInfo TAtrac3Processor::CreateSubbandInfo(TFloat* in[4], uint32_t channel, TTransientDetector* transientDetector) {
assert(false); //not implemented
return {};
}
TPCMEngine<TFloat>::TProcessLambda TAtrac3Processor::GetEncodeLambda() {
TOma* omaptr = dynamic_cast<TOma*>(Oma.get());
if (!omaptr) {
std::cerr << "Wrong container" << std::endl;
abort();
}
TAtrac3BitStreamWriter* bitStreamWriter = new TAtrac3BitStreamWriter(omaptr, *Params.ConteinerParams);
return [this, bitStreamWriter](TFloat* data, const TPCMEngine<TFloat>::ProcessMeta& meta) {
for (uint32_t channel=0; channel < 2; channel++) {
vector<TFloat> specs(1024);
TFloat src[NumSamples];
for (int i = 0; i < NumSamples; ++i) {
src[i] = data[meta.Channels == 1 ? i : (i * 2 + channel)] / 4.0; //no mono mode in atrac3. //TODO we can TFloat frame after encoding
}
TFloat* p[4] = {&PcmBuffer[channel][0][0], &PcmBuffer[channel][1][0], &PcmBuffer[channel][2][0], &PcmBuffer[channel][3][0]};
SplitFilterBank[channel].Split(&src[0], p);
TAtrac3Data::SubbandInfo siCur = Params.NoGainControll ?
TAtrac3Data::SubbandInfo() : CreateSubbandInfo(p, channel, &TransientDetectors[channel*4]); //4 detectors per band
Mdct(specs.data(), p, MakeGainModulatorArray(siCur));
TTonalComponents tonals = Params.NoTonalComponents ?
TAtrac3Data::TTonalComponents() : ExtractTonalComponents(specs.data(), [](const TFloat* spec, uint16_t len) {
std::vector<TFloat> magnitude(len);
for (uint16_t i = 0; i < len; ++i) {
magnitude[i] = std::abs(spec[i]);
}
float median = CalcMedian(magnitude.data(), len);
for (uint16_t i = 0; i < len; ++i) {
if (median > 0.001) {
return median;
}
}
return NAN;
});
const std::vector<TTonalComponent>& components = MapTonalComponents(tonals);
//TBlockSize for ATRAC3 - 4 subband, all are long (no short window)
bitStreamWriter->WriteSoundUnit(siCur, components, Scaler.ScaleFrame(specs, TBlockSize()));
}
};
}
TPCMEngine<TFloat>::TProcessLambda TAtrac3Processor::GetDecodeLambda() {
abort();
return {};
}
}//namespace NAtracDEnc
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