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#include "atrac3_bitstream.h"
#include "../bitstream/bitstream.h"
#include <cassert>
#include <algorithm>
#include <iostream>
#include <vector>
#include <cstdlib>
using NAtracDEnc::TScaledBlock;
using std::vector;
uint32_t TAtrac3BitStreamWriter::CLCEnc(const uint32_t selector, const int mantissas[MAXSPECPERBLOCK], const uint32_t blockSize, NBitStream::TBitStream* bitStream) {
const uint32_t numBits = ClcLengthTab[selector];
const uint32_t bitsUsed = (selector > 1) ? numBits * blockSize : numBits * blockSize / 2;
if (!bitStream)
return bitsUsed;
if (selector > 1) {
for (uint32_t i = 0; i < blockSize; ++i) {
bitStream->Write(NBitStream::MakeSign(mantissas[i], numBits), numBits);
}
} else {
for (uint32_t i = 0; i < blockSize / 2; ++i) {
uint32_t code = MantissaToCLcIdx(mantissas[i * 2]) << 2;
code |= MantissaToCLcIdx(mantissas[i * 2 + 1]);
assert(numBits == 4);
bitStream->Write(code, numBits);
}
}
return bitsUsed;
}
uint32_t TAtrac3BitStreamWriter::VLCEnc(const uint32_t selector, const int mantissas[MAXSPECPERBLOCK], const uint32_t blockSize, NBitStream::TBitStream* bitStream) {
const THuffEntry* huffTable = HuffTables[selector - 1].Table;
const uint8_t tableSz = HuffTables[selector - 1].Sz;
uint32_t bitsUsed = 0;
if (selector > 1) {
for (uint32_t i = 0; i < blockSize; ++i) {
int m = mantissas[i];
uint32_t huffS = (m < 0) ? (((uint32_t)(-m)) << 1) | 1 : ((uint32_t)m) << 1;
if (huffS)
huffS -= 1;
assert(huffS < 256);
assert(huffS < tableSz);
bitsUsed += huffTable[huffS].Bits;
if (bitStream)
bitStream->Write(huffTable[huffS].Code, huffTable[huffS].Bits);
}
} else {
assert(tableSz == 9);
for (uint32_t i = 0; i < blockSize / 2; ++i) {
const int ma = mantissas[i * 2];
const int mb = mantissas[i * 2 + 1];
const uint32_t huffS = MantissasToVlcIndex(ma, mb);
bitsUsed += huffTable[huffS].Bits;
if (bitStream)
bitStream->Write(huffTable[huffS].Code, huffTable[huffS].Bits);
}
}
return bitsUsed;
}
std::pair<uint8_t, uint32_t> TAtrac3BitStreamWriter::CalcSpecsBitsConsumption(const vector<TScaledBlock>& scaledBlocks, const vector<uint32_t>& precisionPerEachBlocks, int* mantisas) {
uint32_t bitsUsed = 5 + 1; //numBlocks + codingMode
const uint32_t numBlocks = precisionPerEachBlocks.size();
bitsUsed += numBlocks * 3; //used VLC or CLC table (precision)
auto lambda = [=](bool clcMode, bool calcMant) {
uint32_t bits = 0;
for (uint32_t i = 0; i < numBlocks; ++i) {
if (precisionPerEachBlocks[i] == 0)
continue;
bits += 6; //sfi
const uint32_t first = BlockSizeTab[i];
const uint32_t last = BlockSizeTab[i+1];
const uint32_t blockSize = last - first;
const double mul = MaxQuant[std::min(precisionPerEachBlocks[i], (uint32_t)7)];
if (calcMant) {
for (uint32_t j = 0, f = first; f < last; f++, j++) {
mantisas[f] = round(scaledBlocks[i].Values[j] * mul);
}
}
bits += clcMode ? CLCEnc(precisionPerEachBlocks[i], mantisas + first, blockSize, nullptr) :
VLCEnc(precisionPerEachBlocks[i], mantisas + first, blockSize, nullptr);
}
return bits;
};
const uint32_t clcBits = lambda(true, true);
const uint32_t vlcBits = lambda(false, false);
bool mode = clcBits <= vlcBits;
//std::cout << "mode: " << mode << " " << clcBits << " " <<vlcBits << std::endl;
return std::make_pair(mode, bitsUsed + (mode ? clcBits : vlcBits));
}
void TAtrac3BitStreamWriter::EncodeSpecs(const vector<TScaledBlock>& scaledBlocks, const vector<uint32_t>& precisionPerEachBlocks, NBitStream::TBitStream* bitStream) {
const uint32_t numBlocks = precisionPerEachBlocks.size(); //number of blocks to save
int mt[MAX_SPECS];
const auto consumption = CalcSpecsBitsConsumption(scaledBlocks, precisionPerEachBlocks, mt);
const uint32_t codingMode = consumption.first;//0 - VLC, 1 - CLC
assert(numBlocks <= 32);
bitStream->Write(numBlocks-1, 5);
bitStream->Write(codingMode, 1);
for (uint32_t i = 0; i < numBlocks; ++i) {
uint32_t val = precisionPerEachBlocks[i]; //coding table used (VLC) or number of bits used (CLC)
bitStream->Write(val, 3);
}
for (uint32_t i = 0; i < numBlocks; ++i) {
if (precisionPerEachBlocks[i] == 0)
continue;
bitStream->Write(scaledBlocks[i].ScaleFactorIndex, 6);
}
for (uint32_t i = 0; i < numBlocks; ++i) {
if (precisionPerEachBlocks[i] == 0)
continue;
const uint32_t first = BlockSizeTab[i];
const uint32_t last = BlockSizeTab[i+1];
const uint32_t blockSize = last - first;
if (codingMode == 1) {
CLCEnc(precisionPerEachBlocks[i], mt + first, blockSize, bitStream);
} else {
VLCEnc(precisionPerEachBlocks[i], mt + first, blockSize, bitStream);
}
}
}
void TAtrac3BitStreamWriter::WriteSoundUnit(const TAtrac3Data::SubbandInfo& subbandInfo, const vector<TScaledBlock>& scaledBlocks) {
NBitStream::TBitStream bitStream;
if (Params.Js) {
//TODO
} else {
bitStream.Write(0x28, 6); //0x28 - id
}
const uint32_t numQmfBand = subbandInfo.GetQmfNum();
bitStream.Write(numQmfBand - 1, 2);
//write gain info
for (uint32_t band = 0; band < numQmfBand; ++band) {
const vector<TAtrac3Data::SubbandInfo::TGainPoint>& GainPoints = subbandInfo.GetGainPoints(band);
bitStream.Write(GainPoints.size(), 3);
for (const TAtrac3Data::SubbandInfo::TGainPoint& point : GainPoints) {
bitStream.Write(point.Level, 4);
bitStream.Write(point.Location, 5);
}
}
//tonal components
bitStream.Write(0, 5); //disabled
vector<uint32_t> precisionPerEachBlocks(27,1);
for (int i = 0; i < 2; i++) {
//precisionPerEachBlocks[i] = 4;
}
//spec
EncodeSpecs(scaledBlocks, precisionPerEachBlocks, &bitStream);
if (!Container)
abort();
if (OutBuffer.empty()) {
std::vector<char> channel = bitStream.GetBytes();
//std::cout << channel.size() << std::endl;
assert(channel.size() <= Params.FrameSz/2);
channel.resize(Params.FrameSz/2);
OutBuffer.insert(OutBuffer.end(), channel.begin(), channel.end());
} else {
std::vector<char> channel = bitStream.GetBytes();
channel.resize(Params.FrameSz/2);
//std::cout << channel.size() << std::endl;
assert(channel.size() <= Params.FrameSz/2);
OutBuffer.insert(OutBuffer.end(), channel.begin(), channel.end());
Container->WriteFrame(OutBuffer);
OutBuffer.clear();
}
}
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