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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 "atrac1_bitalloc.h"
#include "atrac_psy_common.h"
#include "atrac_scale.h"
#include "atrac1.h"
#include <math.h>
#include <cassert>
#include "bitstream/bitstream.h"
#include "../env.h"
namespace NAtracDEnc {
namespace NAtrac1 {
using std::vector;
using std::cerr;
using std::endl;
using std::pair;
static const uint32_t FixedBitAllocTableLong[TAtrac1BitStreamWriter::MaxBfus] = {
7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4,
4, 4, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 0, 0, 0
};
static const uint32_t FixedBitAllocTableShort[TAtrac1BitStreamWriter::MaxBfus] = {
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
4, 4, 4, 4, 4, 4, 4, 4, 0, 0, 0, 0, 0, 0, 0, 0
};
static const uint32_t BitBoostMask[TAtrac1BitStreamWriter::MaxBfus] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,
1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
TBitsBooster::TBitsBooster() {
for (uint32_t i = 0; i < MaxBfus; ++i) {
if (BitBoostMask[i] == 0)
continue;
const uint32_t nBits = SpecsPerBlock[i];
BitsBoostMap.insert(pair<uint32_t, uint32_t>(nBits, i));
}
MaxBitsPerIteration = BitsBoostMap.size() ? (--BitsBoostMap.end())->first : 0;
MinKey = BitsBoostMap.begin()->first;
}
uint32_t TBitsBooster::ApplyBoost(std::vector<uint32_t>* bitsPerEachBlock, uint32_t cur, uint32_t target) {
uint32_t surplus = target - cur;
uint32_t key = (surplus > MaxBitsPerIteration) ? MaxBitsPerIteration : surplus;
std::multimap<uint32_t, uint32_t>::iterator maxIt = BitsBoostMap.upper_bound(key);
//the key too low
if (maxIt == BitsBoostMap.begin())
return surplus;
while (surplus >= MinKey) {
bool done = true;
for (std::multimap<uint32_t, uint32_t>::iterator it = BitsBoostMap.begin(); it != maxIt; ++it) {
const uint32_t curBits = it->first;
const uint32_t curPos = it->second;
assert(key >= curBits);
if (curPos >= bitsPerEachBlock->size())
break;
if ((*bitsPerEachBlock)[curPos] == 16u)
continue;
const uint32_t nBitsPerSpec = (*bitsPerEachBlock)[curPos] ? 1 : 2;
if ((*bitsPerEachBlock)[curPos] == 0u && curBits * 2 > surplus)
continue;
if (curBits * nBitsPerSpec > surplus)
continue;
(*bitsPerEachBlock)[curPos] += nBitsPerSpec;
surplus -= curBits * nBitsPerSpec;
done = false;
}
if (done)
break;
}
return surplus;
}
std::vector<TFloat> TAtrac1SimpleBitAlloc::ATHLong;
TAtrac1SimpleBitAlloc::TAtrac1SimpleBitAlloc(ICompressedOutput* container, uint32_t bfuIdxConst, bool fastBfuNumSearch)
: TAtrac1BitStreamWriter(container)
, BfuIdxConst(bfuIdxConst)
, FastBfuNumSearch(fastBfuNumSearch)
{
if (ATHLong.size()) {
return;
}
ATHLong.reserve(MaxBfus);
auto ATHSpec = CalcATH(512, 44100);
for (size_t bandNum = 0; bandNum < this->NumQMF; ++bandNum) {
for (size_t blockNum = this->BlocksPerBand[bandNum]; blockNum < this->BlocksPerBand[bandNum + 1]; ++blockNum) {
const size_t specNumStart = this->SpecsStartLong[blockNum];
float x = 999;
for (size_t line = specNumStart; line < specNumStart + this->SpecsPerBlock[blockNum]; line++) {
x = fmin(x, ATHSpec[line]);
}
x = pow(10, 0.1 * x);
ATHLong.push_back(x);
}
}
}
vector<uint32_t> TAtrac1SimpleBitAlloc::CalcBitsAllocation(const std::vector<TScaledBlock>& scaledBlocks,
const uint32_t bfuNum,
const TFloat spread,
const TFloat shift,
const TBlockSize& blockSize,
const float loudness) {
vector<uint32_t> bitsPerEachBlock(bfuNum);
for (size_t i = 0; i < bitsPerEachBlock.size(); ++i) {
bool shortBlock = blockSize.LogCount[BfuToBand(i)];
const uint32_t fix = shortBlock ? FixedBitAllocTableShort[i] : FixedBitAllocTableLong[i];
float ath = ATHLong[i] * loudness;
//std::cerr << "block: " << i << " Loudness: " << loudness << " " << 10 * log10(scaledBlocks[i].MaxEnergy / ath) << std::endl;
if (!shortBlock && scaledBlocks[i].MaxEnergy < ath) {
bitsPerEachBlock[i] = 0;
} else {
int tmp = spread * ( (TFloat)scaledBlocks[i].ScaleFactorIndex/3.2) + (1.0 - spread) * fix - shift;
if (tmp > 16) {
bitsPerEachBlock[i] = 16;
} else if (tmp < 2) {
bitsPerEachBlock[i] = 0;
} else {
bitsPerEachBlock[i] = tmp;
}
}
}
return bitsPerEachBlock;
}
uint32_t TAtrac1SimpleBitAlloc::GetMaxUsedBfuId(const vector<uint32_t>& bitsPerEachBlock) {
uint32_t idx = 7;
for (;;) {
uint32_t bfuNum = BfuAmountTab[idx];
if (bfuNum > bitsPerEachBlock.size()) {
idx--;
} else if (idx != 0) {
assert(bfuNum == bitsPerEachBlock.size());
uint32_t i = 0;
while (idx && bitsPerEachBlock[bfuNum - 1 - i] == 0) {
if (++i >= (BfuAmountTab[idx] - BfuAmountTab[idx-1])) {
idx--;
bfuNum -= i;
i = 0;
}
assert(bfuNum - i >= 1);
}
break;
} else {
break;
}
}
return idx;
}
uint32_t TAtrac1SimpleBitAlloc::CheckBfuUsage(bool* changed,
uint32_t curBfuId, const vector<uint32_t>& bitsPerEachBlock) {
uint32_t usedBfuId = GetMaxUsedBfuId(bitsPerEachBlock);
if (usedBfuId < curBfuId) {
*changed = true;
curBfuId = FastBfuNumSearch ? usedBfuId : (curBfuId - 1);
}
return curBfuId;
}
uint32_t TAtrac1SimpleBitAlloc::Write(const std::vector<TScaledBlock>& scaledBlocks, const TBlockSize& blockSize, float loudness) {
uint32_t bfuIdx = BfuIdxConst ? BfuIdxConst - 1 : 7;
bool autoBfu = !BfuIdxConst;
TFloat spread = AnalizeScaleFactorSpread(scaledBlocks);
vector<uint32_t> bitsPerEachBlock(BfuAmountTab[bfuIdx]);
uint32_t targetBitsPerBfus;
uint32_t curBitsPerBfus;
for (;;) {
bitsPerEachBlock.resize(BfuAmountTab[bfuIdx]);
const uint32_t bitsAvaliablePerBfus = SoundUnitSize * 8 - BitsPerBfuAmountTabIdx - 32 - 2 - 3 -
bitsPerEachBlock.size() * (BitsPerIDWL + BitsPerIDSF);
TFloat maxShift = 15;
TFloat minShift = -3;
TFloat shift = 3.0;
const uint32_t maxBits = bitsAvaliablePerBfus;
const uint32_t minBits = bitsAvaliablePerBfus - 110;
bool bfuNumChanged = false;
for (;;) {
const vector<uint32_t>& tmpAlloc = CalcBitsAllocation(scaledBlocks, BfuAmountTab[bfuIdx],
spread, shift, blockSize, loudness);
uint32_t bitsUsed = 0;
for (size_t i = 0; i < tmpAlloc.size(); i++) {
bitsUsed += SpecsPerBlock[i] * tmpAlloc[i];
}
if (bitsUsed < minBits) {
if (maxShift - minShift < 0.1) {
if (autoBfu) {
bfuIdx = CheckBfuUsage(&bfuNumChanged, bfuIdx, tmpAlloc);
}
if (!bfuNumChanged) {
bitsPerEachBlock = tmpAlloc;
}
curBitsPerBfus = bitsUsed;
break;
}
maxShift = shift;
shift -= (shift - minShift) / 2;
} else if (bitsUsed > maxBits) {
minShift = shift;
shift += (maxShift - shift) / 2;
} else {
if (autoBfu) {
bfuIdx = CheckBfuUsage(&bfuNumChanged, bfuIdx, tmpAlloc);
}
if (!bfuNumChanged) {
bitsPerEachBlock = tmpAlloc;
}
curBitsPerBfus = bitsUsed;
break;
}
}
if (!bfuNumChanged) {
targetBitsPerBfus = bitsAvaliablePerBfus;
break;
}
}
ApplyBoost(&bitsPerEachBlock, curBitsPerBfus, targetBitsPerBfus);
WriteBitStream(bitsPerEachBlock, scaledBlocks, bfuIdx, blockSize);
return BfuAmountTab[bfuIdx];
}
TAtrac1BitStreamWriter::TAtrac1BitStreamWriter(ICompressedOutput* container)
: Container(container)
{
NEnv::SetRoundFloat();
};
void TAtrac1BitStreamWriter::WriteBitStream(const vector<uint32_t>& bitsPerEachBlock,
const std::vector<TScaledBlock>& scaledBlocks,
uint32_t bfuAmountIdx,
const TBlockSize& blockSize) {
NBitStream::TBitStream bitStream;
size_t bitUsed = 0;
if (bfuAmountIdx >= (1 << BitsPerBfuAmountTabIdx)) {
cerr << "Wrong bfuAmountIdx (" << bfuAmountIdx << "), frame skiped" << endl;
return;
}
bitStream.Write(0x2 - blockSize.LogCount[0], 2);
bitUsed+=2;
bitStream.Write(0x2 - blockSize.LogCount[1], 2);
bitUsed+=2;
bitStream.Write(0x3 - blockSize.LogCount[2], 2);
bitStream.Write(0, 2);
bitUsed+=4;
bitStream.Write(bfuAmountIdx, BitsPerBfuAmountTabIdx);
bitUsed += BitsPerBfuAmountTabIdx;
bitStream.Write(0, 2);
bitStream.Write(0, 3);
bitUsed+= 5;
for (const auto wordLength : bitsPerEachBlock) {
const auto tmp = wordLength ? (wordLength - 1) : 0;
bitStream.Write(tmp, 4);
bitUsed+=4;
}
for (size_t i = 0; i < bitsPerEachBlock.size(); ++i) {
bitStream.Write(scaledBlocks[i].ScaleFactorIndex, 6);
bitUsed+=6;
}
for (size_t i = 0; i < bitsPerEachBlock.size(); ++i) {
const auto wordLength = bitsPerEachBlock[i];
if (wordLength == 0 || wordLength == 1)
continue;
const TFloat multiple = ((1 << (wordLength - 1)) - 1);
for (const TFloat val : scaledBlocks[i].Values) {
const int tmp = lrint(val * multiple);
const uint32_t testwl = bitsPerEachBlock[i] ? (bitsPerEachBlock[i] - 1) : 0;
const uint32_t a = !!testwl + testwl;
if (a != wordLength) {
cerr << "wordlen error " << a << " " << wordLength << endl;
abort();
}
bitStream.Write(NBitStream::MakeSign(tmp, wordLength), wordLength);
bitUsed+=wordLength;
}
}
bitStream.Write(0x0, 8);
bitStream.Write(0x0, 8);
bitUsed+=16;
bitStream.Write(0x0, 8);
bitUsed+=8;
if (bitUsed > SoundUnitSize * 8) {
cerr << "ATRAC1 bitstream corrupted, used: " << bitUsed << " exp: " << SoundUnitSize * 8 << endl;
abort();
}
Container->WriteFrame(bitStream.GetBytes());
}
} //namespace NAtrac1
} //namespace NAtracDEnc
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