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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 <vector>
#include "atrac1denc.h"
#include "bitstream/bitstream.h"
#include "atrac/atrac1.h"
#include "atrac/atrac1_dequantiser.h"
#include "atrac/atrac1_qmf.h"
#include "atrac/atrac1_bitalloc.h"
#include "util.h"
namespace NAtracDEnc {
using namespace NBitStream;
using namespace NAtrac1;
using namespace NMDCT;
using std::vector;
TAtrac1Encoder::TAtrac1Encoder(TCompressedOutputPtr&& aea, TAtrac1EncodeSettings&& settings)
: Aea(std::move(aea))
, Settings(std::move(settings))
{
}
TAtrac1Decoder::TAtrac1Decoder(TCompressedInputPtr&& aea)
: Aea(std::move(aea))
{
}
static void vector_fmul_window(TFloat *dst, const TFloat *src0,
const TFloat *src1, const TFloat *win, int len)
{
int i, j;
dst += len;
win += len;
src0 += len;
for (i = -len, j = len - 1; i < 0; i++, j--) {
TFloat s0 = src0[i];
TFloat s1 = src1[j];
TFloat wi = win[i];
TFloat wj = win[j];
dst[i] = s0 * wj - s1 * wi;
dst[j] = s0 * wi + s1 * wj;
}
}
void TAtrac1MDCT::Mdct(TFloat Specs[512], TFloat* low, TFloat* mid, TFloat* hi, const TBlockSize& blockSize) {
uint32_t pos = 0;
for (uint32_t band = 0; band < NumQMF; band++) {
const uint32_t numMdctBlocks = 1 << blockSize.LogCount[band];
TFloat* 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 TFloat multiple = (numMdctBlocks != 1 && band == 2) ? 2.0 : 1.0;
vector<TFloat> tmp(512);
uint32_t blockPos = 0;
for (size_t k = 0; k < numMdctBlocks; ++k) {
memcpy(&tmp[winStart], &srcBuf[bufSz], 32 * sizeof(TFloat));
for (size_t 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(TFloat));
const vector<TFloat>& sp = (numMdctBlocks == 1) ? ((band == 2) ? Mdct512(&tmp[0]) : Mdct256(&tmp[0])) : Mdct64(&tmp[0]);
for (size_t i = 0; i < sp.size(); i++) {
Specs[blockPos + pos + i] = sp[i] * multiple;
}
if (band) {
SwapArray(&Specs[blockPos + pos], sp.size());
}
blockPos += 32;
}
pos += bufSz;
}
}
void TAtrac1MDCT::IMdct(TFloat Specs[512], const TBlockSize& mode, TFloat* low, TFloat* mid, TFloat* hi) {
uint32_t pos = 0;
for (size_t band = 0; band < NumQMF; 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;
TFloat* dstBuf = (band == 0) ? low : (band == 1) ? mid : hi;
vector<TFloat> invBuf(512);
TFloat* prevBuf = &dstBuf[bufSz * 2 - 16];
for (uint32_t block = 0; block < numMdctBlocks; block++) {
if (band) {
SwapArray(&Specs[pos], blockSz);
}
vector<TFloat> inv = (numMdctBlocks != 1) ? Midct64(&Specs[pos]) : (bufSz == 128) ? Midct256(&Specs[pos]) : Midct512(&Specs[pos]);
for (size_t 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(TFloat));
for (size_t j = 0; j < 16; j++) {
dstBuf[bufSz*2 - 16 + j] = invBuf[bufSz - 16 + j];
}
}
}
TPCMEngine<TFloat>::TProcessLambda TAtrac1Decoder::GetLambda() {
return [this](TFloat* data, const TPCMEngine<TFloat>::ProcessMeta& /*meta*/) {
TFloat sum[512];
const uint32_t srcChannels = Aea->GetChannelNum();
for (uint32_t channel = 0; channel < srcChannels; channel++) {
std::unique_ptr<ICompressedIO::TFrame> frame(Aea->ReadFrame());
TBitStream bitstream(frame->Get(), frame->Size());
TBlockSize mode(&bitstream);
TAtrac1Dequantiser dequantiser;
vector<TFloat> 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]);
for (size_t i = 0; i < NumSamples; ++i) {
if (sum[i] > PcmValueMax)
sum[i] = PcmValueMax;
if (sum[i] < PcmValueMin)
sum[i] = PcmValueMin;
data[i * srcChannels + channel] = sum[i];
}
}
};
}
TPCMEngine<TFloat>::TProcessLambda TAtrac1Encoder::GetLambda() {
const uint32_t srcChannels = Aea->GetChannelNum();
vector<IAtrac1BitAlloc*> bitAlloc;
for (size_t i = 0; i < srcChannels; i++) {
bitAlloc.push_back(new TAtrac1SimpleBitAlloc(Aea.get(), Settings.GetBfuIdxConst(), Settings.GetFastBfuNumSearch()));
}
return [this, srcChannels, bitAlloc](TFloat* data, const TPCMEngine<TFloat>::ProcessMeta& /*meta*/) {
for (uint32_t channel = 0; channel < srcChannels; channel++) {
TFloat src[NumSamples];
vector<TFloat> specs(512);
for (size_t i = 0; i < NumSamples; ++i) {
src[i] = data[i * srcChannels + channel];
}
AnalysisFilterBank[channel].Analysis(&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<TFloat>& invMid = InvertSpectr<128>(&PcmBufMid[channel][0]);
windowMask |= (uint32_t)TransientDetectors.GetDetector(channel, 1).Detect(&invMid[0]) << 1;
const vector<TFloat>& 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
Mdct(&specs[0], &PcmBufLow[channel][0], &PcmBufMid[channel][0], &PcmBufHi[channel][0], blockSize);
bitAlloc[channel]->Write(Scaler.ScaleFrame(specs, blockSize), blockSize);
}
};
}
} //namespace NAtracDEnc
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