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#include "atrac1_bitalloc.h"
#include "atrac1_scale.h"
#include "atrac1.h"
#include <math.h>
#include "../bitstream/bitstream.h"
namespace NAtrac1 {
using std::vector;
using std::cerr;
using std::endl;
static const uint32_t FixedBitAllocTableLong[MAX_BFUS] = {
6, 7, 7, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6,
6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 5,
5, 4, 4, 3, 3, 3, 3, 2, 0, 0, 0, 0, 0, 0, 0
};
//returns 1 for tone-like, 0 - noise-like
static double AnalizeSpread(const std::vector<TScaledBlock>& scaledBlocks) {
double s = 0.0;
for (int i = 0; i < scaledBlocks.size(); ++i) {
s += scaledBlocks[i].ScaleFactorIndex;
}
s /= scaledBlocks.size();
double sigma = 0.0;
double xxx = 0.0;
for (int i = 0; i < scaledBlocks.size(); ++i) {
xxx = (scaledBlocks[i].ScaleFactorIndex - s);
xxx *= xxx;
sigma += xxx;
}
sigma /= scaledBlocks.size();
sigma = sqrt(sigma);
if (sigma > 14.0)
sigma = 14.0;
return sigma/14.0;
}
vector<uint32_t> TAtrac1SimpleBitAlloc::CalcBitsAllocation(const std::vector<TScaledBlock>& scaledBlocks, const double spread, const double shift) {
vector<uint32_t> bitsPerEachBlock;
bitsPerEachBlock.resize(scaledBlocks.size());
for (int i = 0; i < scaledBlocks.size(); ++i) {
int tmp = spread * ( (double)scaledBlocks[i].ScaleFactorIndex/5.2) + (1.0 - spread) * (FixedBitAllocTableLong[i] + 1) - shift;
if (tmp > 16) {
bitsPerEachBlock[i] = 16;
} else if (tmp < 2) {
bitsPerEachBlock[i] = 0;
} else {
bitsPerEachBlock[i] = tmp;
}
}
return bitsPerEachBlock;
}
uint32_t TAtrac1SimpleBitAlloc::Write(const std::vector<TScaledBlock>& scaledBlocks) {
uint32_t bfuIdx = 7;
vector<uint32_t> bitsPerEachBlock;
double spread = AnalizeSpread(scaledBlocks);
bitsPerEachBlock.resize(scaledBlocks.size());
const uint32_t bitsAvaliablePerBfus = SoundUnitSize * 8 - BitsPerBfuAmountTabIdx - 32 - 2 - 3 - bitsPerEachBlock.size() * (BitsPerIDWL + BitsPerIDSF);
double maxShift = 4;
double minShift = -2;
double shift = 3.0;
const uint32_t maxBits = bitsAvaliablePerBfus;
const uint32_t minBits = bitsAvaliablePerBfus - 110;
for(;;) {
const vector<uint32_t>& tmpAlloc = CalcBitsAllocation(scaledBlocks, spread, shift);
uint32_t bitsUsed = 0;
for (int i = 0; i < tmpAlloc.size(); i++) {
bitsUsed += SpecsPerBlock[i] * tmpAlloc[i];
}
//std::cout << spread << " bitsUsed: " << bitsUsed << " min " << minBits << " max " << maxBits << endl;
if (bitsUsed < minBits) {
if (maxShift - minShift < 0.1) {
bitsPerEachBlock = tmpAlloc;
break;
}
maxShift = shift;
shift -= (shift - minShift) / 2;
} else if (bitsUsed > maxBits) {
minShift = shift;
shift += (maxShift - shift) / 2;
} else {
bitsPerEachBlock = tmpAlloc;
break;
}
}
WriteBitStream(bitsPerEachBlock, scaledBlocks, bfuIdx);
return BfuAmountTab[bfuIdx];
}
void TAtrac1BitStreamWriter::WriteBitStream(const vector<uint32_t>& bitsPerEachBlock, const std::vector<TScaledBlock>& scaledBlocks, uint32_t bfuAmountIdx) {
NBitStream::TBitStream bitStream;
int bitUsed = 0;
if (bfuAmountIdx >= (1 << BitsPerBfuAmountTabIdx)) {
cerr << "Wrong bfuAmountIdx (" << bfuAmountIdx << "), frame skiped" << endl;
return;
}
bitStream.Write(0x2, 2);
bitUsed+=2;
bitStream.Write(0x2, 2);
bitUsed+=2;
bitStream.Write(0x3, 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 (int i = 0; i < bitsPerEachBlock.size(); ++i) {
bitStream.Write(scaledBlocks[i].ScaleFactorIndex, 6);
bitUsed+=6;
}
for (int i = 0; i < bitsPerEachBlock.size(); ++i) {
const auto wordLength = bitsPerEachBlock[i];
if (wordLength == 0 || wordLength == 1)
continue;
const double multiple = ((1 << (wordLength - 1)) - 1);
for (const double val : scaledBlocks[i].Values) {
const int tmp = val * multiple;
const int testwl = bitsPerEachBlock[i] ? (bitsPerEachBlock[i] - 1) : 0;
const int 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());
}
}
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