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#include <vector>
#include "atracdenc.h"
#include "bitstream/bitstream.h"
#include "atrac/atrac1.h"
#include "atrac/atrac1_dequantiser.h"
#include "atrac/atrac1_qmf.h"
#include "atrac/atrac1_bitalloc.h"
namespace NAtracDEnc {
using namespace std;
using namespace NBitStream;
using namespace NAtrac1;
using namespace NMDCT;
template<int N>
static vector<double> invertSpectr(double* in) {
vector<double> buf(N);
memcpy(&buf[0], in, N * sizeof(double));
for (int i = 0; i < N; i+=2)
buf[i] *= -1;
return buf;
}
TAtrac1Processor::TAtrac1Processor(TAeaPtr&& aea, bool mono)
: MixChannel(mono)
, Aea(std::move(aea))
{
}
static void vector_fmul_window(double *dst, const double *src0,
const double *src1, const double *win, int len)
{
int i, j;
dst += len;
win += len;
src0 += len;
for (i = -len, j = len - 1; i < 0; i++, j--) {
double s0 = src0[i];
double s1 = src1[j];
double wi = win[i];
double wj = win[j];
dst[i] = s0 * wj - s1 * wi;
dst[j] = s0 * wi + s1 * wj;
}
}
vector<double> midct(double* x, int N) {
vector<double> res;
for (int n = 0; n < 2 * N; n++) {
double sum = 0;
for (int k = 0; k < N; k++) {
sum += (x[k] * cos((M_PI/N) * ((double)n + 0.5 + N/2) * ((double)k + 0.5)));
}
res.push_back(sum);
}
return res;
}
void TAtrac1MDCT::Mdct(double Specs[512], double* low, double* mid, double* hi, const TBlockSize& blockSize) {
uint32_t pos = 0;
for (uint32_t band = 0; band < QMF_BANDS; band++) {
const uint32_t numMdctBlocks = 1 << blockSize.LogCount[band];
double* srcBuf = (band == 0) ? low : (band == 1) ? mid : hi;
uint32_t bufSz = (band == 2) ? 256 : 128;
const uint32_t blockSz = (numMdctBlocks == 1) ? bufSz : 32;
uint32_t winStart = (numMdctBlocks == 1) ? ((band == 2) ? 112 : 48) : 0;
//compensate level for 3rd band in case of short window
const double multiple = (numMdctBlocks != 1 && band == 2) ? 2.0 : 1.0;
vector<double> tmp(512);
uint32_t blockPos = 0;
for (int k = 0; k < numMdctBlocks; ++k) {
memcpy(&tmp[winStart], &srcBuf[bufSz], 32 * sizeof(double));
for (int i = 0; i < 32; i++) {
srcBuf[bufSz + i] = TAtrac1Data::SineWindow[i] * srcBuf[blockPos + blockSz - 32 + i];
srcBuf[blockPos + blockSz - 32 + i] = TAtrac1Data::SineWindow[31 - i] * srcBuf[blockPos + blockSz - 32 + i];
}
memcpy(&tmp[winStart+32], &srcBuf[blockPos], blockSz * sizeof(double));
const vector<double>& sp = (numMdctBlocks == 1) ? ((band == 2) ? Mdct512(&tmp[0]) : Mdct256(&tmp[0])) : Mdct64(&tmp[0]);
for (uint32_t i = 0; i < sp.size(); i++) {
Specs[blockPos + pos + i] = sp[i] * multiple;
}
if (band) {
for (uint32_t j = 0; j < sp.size() / 2; j++) {
double tmp = Specs[blockPos + pos +j];
Specs[blockPos + pos + j] = Specs[blockPos + pos + sp.size() - 1 -j];
Specs[blockPos + pos + sp.size() - 1 -j] = tmp;
}
}
blockPos += 32;
}
pos += bufSz;
}
}
void TAtrac1MDCT::IMdct(double Specs[512], const TBlockSize& mode, double* low, double* mid, double* hi) {
uint32_t pos = 0;
for (uint32_t band = 0; band < QMF_BANDS; band++) {
const uint32_t numMdctBlocks = 1 << mode.LogCount[band];
const uint32_t bufSz = (band == 2) ? 256 : 128;
const uint32_t blockSz = (numMdctBlocks == 1) ? bufSz : 32;
uint32_t start = 0;
double* dstBuf = (band == 0) ? low : (band == 1) ? mid : hi;
vector<double> invBuf(512);
double* prevBuf = &dstBuf[bufSz * 2 - 16];
for (uint32_t block = 0; block < numMdctBlocks; block++) {
if (band) {
for (uint32_t j = 0; j < blockSz/2; j++) {
double tmp = Specs[pos+j];
Specs[pos+j] = Specs[pos + blockSz - 1 -j];
Specs[pos + blockSz - 1 -j] = tmp;
}
}
vector<double> inv = (numMdctBlocks != 1) ? midct(&Specs[pos], blockSz) : (bufSz == 128) ? Midct256(&Specs[pos]) : Midct512(&Specs[pos]);
for (int i = 0; i < (inv.size()/2); i++) {
invBuf[start+i] = inv[i + inv.size()/4];
}
vector_fmul_window(dstBuf + start, prevBuf, &invBuf[start], &TAtrac1Data::SineWindow[0], 16);
prevBuf = &invBuf[start+16];
start += blockSz;
pos += blockSz;
}
if (numMdctBlocks == 1)
memcpy(dstBuf + 32, &invBuf[16], ((band == 2) ? 240 : 112) * sizeof(double));
for (int j = 0; j < 16; j++) {
dstBuf[bufSz*2 - 16 + j] = invBuf[bufSz - 16 + j];
}
}
}
TPCMEngine<double>::TProcessLambda TAtrac1Processor::GetDecodeLambda() {
return [this](vector<double>* data) {
double sum[512];
const uint32_t srcChannels = Aea->GetChannelNum();
for (uint32_t channel = 0; channel < srcChannels; channel++) {
std::unique_ptr<TAea::TFrame> frame(Aea->ReadFrame());
TBitStream bitstream(&(*frame.get())[0], frame->size());
// cout << "frame size: " << bitstream.GetBufSize() << endl;
TBlockSize mode(&bitstream);
TAtrac1Dequantiser dequantiser;
vector<double> specs;
specs.resize(512);;
dequantiser.Dequant(&bitstream, mode, &specs[0]);
IMdct(&specs[0], mode, &PcmBufLow[channel][0], &PcmBufMid[channel][0], &PcmBufHi[channel][0]);
SynthesisFilterBank[channel].Synthesis(&sum[0], &PcmBufLow[channel][0], &PcmBufMid[channel][0], &PcmBufHi[channel][0]);
const int numChannel = data[0].size();
for (int i = 0; i < NumSamples; ++i) {
data[i][srcChannels - 1-channel] = sum[i];
}
}
};
}
TPCMEngine<double>::TProcessLambda TAtrac1Processor::GetEncodeLambda(const TAtrac1EncodeSettings& settings) {
const uint32_t srcChannels = Aea->GetChannelNum();
vector<IAtrac1BitAlloc*> bitAlloc;
for (int i = 0; i < srcChannels; i++)
bitAlloc.push_back(new TAtrac1SimpleBitAlloc(Aea.get(), settings.GetBfuIdxConst(), settings.GetFastBfuNumSearch()));
return [this, srcChannels, bitAlloc, settings](vector<double>* data) {
for (uint32_t channel = 0; channel < srcChannels; channel++) {
double src[NumSamples];
vector<double> specs(512);
for (int i = 0; i < NumSamples; ++i) {
src[i] = data[i][channel];
}
SplitFilterBank[channel].Split(&src[0], &PcmBufLow[channel][0], &PcmBufMid[channel][0], &PcmBufHi[channel][0]);
uint32_t windowMask = 0;
if (settings.GetWindowMode() == TAtrac1EncodeSettings::EWindowMode::EWM_AUTO) {
windowMask |= (uint32_t)TransientDetectors.GetDetector(channel, 0).Detect(&PcmBufLow[channel][0]);
const vector<double>& invMid = invertSpectr<128>(&PcmBufMid[channel][0]);
windowMask |= (uint32_t)TransientDetectors.GetDetector(channel, 1).Detect(&invMid[0]) << 1;
const vector<double>& invHi = invertSpectr<256>(&PcmBufHi[channel][0]);
windowMask |= (uint32_t)TransientDetectors.GetDetector(channel, 2).Detect(&invHi[0]) << 2;
//std::cout << "trans: " << windowMask << std::endl;
} else {
//no transient detection, use given mask
windowMask = settings.GetWindowMask();
}
const TBlockSize blockSize(windowMask & 0x1, windowMask & 0x2, windowMask & 0x4); //low, mid, hi
//for (int i = 0; i < 256; ++i) {
// std::cout << PcmBufHi[channel][i] << std::endl;
//}
//std::cout<< "============" << std::endl;
Mdct(&specs[0], &PcmBufLow[channel][0], &PcmBufMid[channel][0], &PcmBufHi[channel][0], blockSize);
bitAlloc[channel]->Write(Scaler.Scale(specs, blockSize), blockSize);
}
};
}
}
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