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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 "atrac3denc.h"
#include "transient_detector.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], TFloat maxLevels[4], TGainModulatorArray gainModulators)
{
for (int band = 0; band < 4; ++band) {
TFloat* srcBuff = bands[band];
TFloat* const curSpec = &specs[band*256];
TGainModulator modFn = gainModulators[band];
TFloat tmp[512];
memcpy(&tmp[0], srcBuff, 256 * sizeof(TFloat));
if (modFn) {
modFn(&tmp[0], &srcBuff[256]);
}
TFloat max = 0.0;
for (int i = 0; i < 256; i++) {
max = std::max(max, std::abs(srcBuff[256+i]));
srcBuff[i] = TAtrac3Data::EncodeWindow[i] * srcBuff[256+i];
tmp[256+i] = TAtrac3Data::EncodeWindow[255-i] * srcBuff[256+i];
}
const vector<TFloat>& sp = Mdct512(&tmp[0]);
assert(sp.size() == 256);
memcpy(curSpec, sp.data(), 256 * sizeof(TFloat));
if (band & 1) {
SwapArray(curSpec, 256);
}
maxLevels[band] = max;
}
}
void TAtrac3MDCT::Mdct(TFloat specs[1024], TFloat* bands[4], TGainModulatorArray gainModulators)
{
static TFloat dummy[4];
Mdct(specs, bands, dummy, gainModulators);
}
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);
}
}
TAtrac3Encoder::TAtrac3Encoder(TCompressedOutputPtr&& oma, TAtrac3EncoderSettings&& encoderSettings)
: Oma(std::move(oma))
, Params(std::move(encoderSettings))
, SingleChannelElements(Params.SourceChannels)
, TransientParamsHistory(Params.SourceChannels, std::vector<TTransientParam>(4))
{}
TAtrac3Encoder::~TAtrac3Encoder()
{}
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 {};
}
}
TFloat TAtrac3Encoder::LimitRel(TFloat x)
{
return std::min(std::max((double)x, GainLevel[15]), GainLevel[0]);
}
void TAtrac3Encoder::ResetTransientParamsHistory(int channel, int band)
{
TransientParamsHistory[channel][band] = {-1 , 1, -1, 1, -1, 1};
}
void TAtrac3Encoder::SetTransientParamsHistory(int channel, int band, const TTransientParam& params)
{
TransientParamsHistory[channel][band] = params;
}
const TAtrac3Encoder::TTransientParam& TAtrac3Encoder::GetTransientParamsHistory(int channel, int band) const
{
return TransientParamsHistory[channel][band];
}
TAtrac3Encoder::TTransientParam TAtrac3Encoder::CalcTransientParam(const std::vector<TFloat>& gain, const TFloat lastMax)
{
int32_t attack0Location = -1; // position where gain is risen up, -1 - no attack
TFloat attack0Relation = 1;
const TFloat attackThreshold = 2;
{
// pre-echo searching
// relative to previous half frame
for (uint32_t i = 0; i < gain.size(); i++) {
const TFloat tmp = gain[i] / lastMax;
if (tmp > attackThreshold) {
attack0Relation = tmp;
attack0Location = i;
break;
}
}
}
int32_t attack1Location = -1;
TFloat attack1Relation = 1;
{
// pre-echo searching
// relative to previous subsamples block
TFloat q = gain[0];
for (uint32_t i = 1; i < gain.size(); i++) {
const TFloat tmp = gain[i] / q;
if (tmp > attackThreshold) {
attack1Relation = tmp;
attack1Location = i;
}
q = std::max(q, gain[i]);
}
}
int32_t releaseLocation = -1; // position where gain is fallen down, -1 - no release
TFloat releaseRelation = 1;
const TFloat releaseTreshold = 2;
{
// post-echo searching
// relative to current frame
TFloat q = gain.back();
for (uint32_t i = gain.size() - 2; i > 0; --i) {
const TFloat tmp = gain[i] / q;
if (tmp > releaseTreshold) {
releaseRelation = tmp;
releaseLocation = i;
break;
}
q = std::max(q, gain[i]);
}
}
return {attack0Location, attack0Relation, attack1Location, attack1Relation, releaseLocation, releaseRelation};
}
void TAtrac3Encoder::CreateSubbandInfo(TFloat* in[4],
uint32_t channel,
TAtrac3Data::SubbandInfo* subbandInfo)
{
auto relToIdx = [](TFloat rel) {
rel = 1.0/rel;
return (uint32_t)(RelationToIdx(rel));
};
for (int band = 0; band < 4; ++band) {
const TFloat* srcBuff = in[band];
const TFloat* const lastMax = &PrevPeak[channel][band];
std::vector<TAtrac3Data::SubbandInfo::TGainPoint> curve;
const std::vector<TFloat> gain = AnalyzeGain(srcBuff, 256, 32, false);
auto transientParam = CalcTransientParam(gain, *lastMax);
bool hasTransient = false;
if (transientParam.Attack0Location == -1 && transientParam.Attack1Location == -1 && transientParam.ReleaseLocation == -1) {
// No transient
ResetTransientParamsHistory(channel, band);
continue;
}
if (transientParam.Attack0Location == -1 && transientParam.Attack1Location == -1) {
// Release only in current frame - PostEcho. Not implemented yet.
// Note: "Hole like" transient also possible (if value is grather in next frame),
// but we keep peak value of this frame, so in next frame we will use this peak value
// for searching attack.
// Handling "Hole like" transients also not implemented. But it should be masked
SetTransientParamsHistory(channel, band, transientParam);
continue;
}
auto transientParamHistory = GetTransientParamsHistory(channel, band);
if (transientParamHistory.Attack0Location == -1 && transientParamHistory.Attack1Location == -1 && transientParamHistory.ReleaseLocation == -1 &&
transientParam.Attack0Location != -1 /*&& transientParam.Attack1Location == -1*/ && transientParam.ReleaseLocation == -1) {
// No transient at previous frame, but transient (attack) at border of first and second half - simplest way, just scale the first half.
//std::cout << "CASE 1: " << transientParam.Attack0Location << " " << transientParam.Attack0Relation << std::endl;
auto idx = relToIdx(transientParam.Attack0Relation);
//std::cout << "PREV PEAK: " << *lastMax << " " << idx << std::endl;
curve.push_back({idx, (uint32_t)transientParam.Attack0Location});
hasTransient = true;
}
//std::cout << "transient params band: " << band << " atack0loc: " << transientParam.Attack0Location << " atack0rel: " << transientParam.Attack0Relation <<
// " atack1loc: " << transientParam.Attack1Location << " atack1rel: " << transientParam.Attack1Relation <<
// " releaseloc: " << transientParam.ReleaseLocation << " releaserel: "<< transientParam.ReleaseRelation << std::endl;
//for (int i = 0; i < 256; i++) {
// std::cout << i << " " << srcBuff[i] << " | " << srcBuff[i-256] << std::endl;
//}
SetTransientParamsHistory(channel, band, transientParam);
if (hasTransient) {
subbandInfo->AddSubbandCurve(band, std::move(curve));
}
}
}
void TAtrac3Encoder::Matrixing()
{
for (uint32_t subband = 0; subband < 4; subband++) {
TFloat* pair[2] = {PcmBuffer.GetSecond(subband * 2), PcmBuffer.GetSecond(subband * 2 + 1)};
TFloat tmp[2];
for (uint32_t sample = 0; sample < 256; sample++) {
tmp[0] = pair[0][sample];
tmp[1] = pair[1][sample];
pair[0][sample] = (tmp[0] + tmp[1]) / 2.0;
pair[1][sample] = (tmp[0] - tmp[1]) / 2.0;
}
}
}
TPCMEngine<TFloat>::TProcessLambda TAtrac3Encoder::GetLambda()
{
std::shared_ptr<TAtrac3BitStreamWriter> bitStreamWriter(new TAtrac3BitStreamWriter(Oma.get(), *Params.ConteinerParams, Params.BfuIdxConst));
return [this, bitStreamWriter](TFloat* data, const TPCMEngine<TFloat>::ProcessMeta& meta) {
using TSce = TAtrac3BitStreamWriter::TSingleChannelElement;
for (uint32_t channel = 0; channel < meta.Channels; channel++) {
TFloat src[NumSamples];
for (size_t i = 0; i < NumSamples; ++i) {
src[i] = data[i * meta.Channels + channel] / 4.0;
}
{
TFloat* p[4] = {PcmBuffer.GetSecond(channel), PcmBuffer.GetSecond(channel+2), PcmBuffer.GetSecond(channel+4), PcmBuffer.GetSecond(channel+6)};
AnalysisFilterBank[channel].Analysis(&src[0], p);
}
}
if (Params.ConteinerParams->Js && meta.Channels == 2) {
Matrixing();
}
for (uint32_t channel = 0; channel < meta.Channels; channel++) {
vector<TFloat> specs(1024);
TSce* sce = &SingleChannelElements[channel];
sce->SubbandInfo.Reset();
if (!Params.NoGainControll) {
TFloat* p[4] = {PcmBuffer.GetSecond(channel), PcmBuffer.GetSecond(channel+2), PcmBuffer.GetSecond(channel+4), PcmBuffer.GetSecond(channel+6)};
CreateSubbandInfo(p, channel, &sce->SubbandInfo); //4 detectors per band
}
TFloat* maxOverlapLevels = PrevPeak[channel];
{
TFloat* p[4] = {PcmBuffer.GetFirst(channel), PcmBuffer.GetFirst(channel+2), PcmBuffer.GetFirst(channel+4), PcmBuffer.GetFirst(channel+6)};
Mdct(specs.data(), p, maxOverlapLevels, MakeGainModulatorArray(sce->SubbandInfo));
}
sce->Energy = CalcEnergy(specs);
//TBlockSize for ATRAC3 - 4 subband, all are long (no short window)
sce->ScaledBlocks = Scaler.ScaleFrame(specs, TBlockSize());
}
if (Params.ConteinerParams->Js && meta.Channels == 1) {
// In case of JointStereo and one input channel (mono input) we need to construct one empty SCE to produce
// correct bitstream
SingleChannelElements.resize(2);
// Set 1 subband
SingleChannelElements[1].SubbandInfo.Info.resize(1);
}
bitStreamWriter->WriteSoundUnit(SingleChannelElements);
};
}
} //namespace NAtracDEnc
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