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wave.cpp
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wave.cpp
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#include "wave.hpp"
std::vector<float> WaveData::InterpolateSpline(const std::vector<float> &data){
const double lambda = 0.5;
const double mu = 0.5;
std::vector<double> sig;
double h = 1.0 / samplerate;
sig.push_back(0);
for(size_t i=1; i<data.size(); i++)
{
sig.push_back((data[i] - data[i-1])/h);
}
double a =2.0;
double b = lambda;
double c = mu;
std::vector<double> d;
d.push_back(0);
for(size_t i=1; i<sig.size()-1; i++)
{
d.push_back(3*(sig[i+1] - sig[i])/h);
}
std::vector<double> hh;
std::vector<double> kk;
hh.push_back(d[0]/a);
hh.push_back(d[1]/a);
kk.push_back(b/a);
kk.push_back(b/a);
for(size_t i=2; i<d.size(); i++)
{
hh.push_back( (d[i] - c * hh[i-1])/(a - c*kk[i-1]) );
kk.push_back( b/(a - c * kk[i-1]) );
}
std::vector<double> mm(data.size());
mm[hh.size()-1] = hh[hh.size()-1];
for(size_t i=hh.size()-2; i > 0; i--){
mm[i] = hh[i] - kk[i] * mm[i+1];
}
mm[0] = 0;
mm[data.size()-1] = 0;
double dh = h / interp;
std::vector<float> z(interp);
for(size_t k = 1; k < data.size(); k++){
int xi = interp * (k-1);
int xf = interp * k;
double m0 = mm[k-1] / (6*h);
double m1 = mm[k] / (6*h);
double f0 = (data[k-1] - mm[k-1] * h * h / 6) / h;
double f1 = (data[k] - mm[k] * h * h / 6) / h;
for(int i = 1; i <= interp; i++){
double fi = xi * dh;
double ff = xf * dh;
double xii = (xi + i) * dh;
z.push_back(m0 * std::pow((ff - xii), 3)
+ m1 * std::pow((xii - fi), 3)
+ f0 * (ff - xii)
+ f1 * (xii - fi));
}
}
return z;
}
template<typename T>
void WaveData::LoadData(std::ifstream &fin, int channel)
{
float b = (std::numeric_limits<T>::min() < 0)? 0: std::numeric_limits<T>::max() / 2.0;
T ldata = b;
T rdata = b;
long count = 0;
long readcount = header.dataChunk.chunkSize / channel / sizeof(T);
while(!fin.eof() && count <= readcount){
count++;
if(channel == 1){
left.push_back(ldata - b);
fin.read((char *)&ldata, sizeof(T));
}
else if(channel == 2){
left.push_back(ldata - b);
right.push_back(rdata - b);
fin.read((char *)&ldata, sizeof(T));
fin.read((char *)&rdata, sizeof(T));
}
}
printf("%ld samples readed\n", count);
loaded_samples = count-1;
samplerate = header.fmtChunk.samplesPerSec;
printf("InterpolateSpline\n");
if(channel == 1){
leftp = InterpolateSpline(left);
}
else if (channel == 2){
std::thread t1([this](void) {
leftp = InterpolateSpline(left);
});
std::thread t2([this](void) {
rightp = InterpolateSpline(right);
});
t1.join();
t2.join();
}
}
WaveData::WaveData(char *filename)
{
loaded_samples = -1;
std::ifstream fin(filename, std::ios::binary);
if(fin){
fin.read((char *)&header.riffChunk, sizeof(RIFF_CHUNK));
fin.read((char *)&header.fmtChunk, sizeof(FMT_CHUNK));
fin.seekg(header.fmtChunk.chunkSize + 8 - sizeof(FMT_CHUNK),std::ios_base::cur);
fin.read((char *)&header.dataChunk, sizeof(DATA_CHUNK));
if(strncmp(header.riffChunk.chunkID,"RIFF", 4) != 0){
return;
}
if(strncmp(header.riffChunk.chunkFormType,"WAVE", 4) != 0){
return;
}
if(strncmp(header.fmtChunk.chunkID,"fmt ", 4) != 0){
return;
}
if(strncmp(header.dataChunk.chunkID,"data", 4) != 0){
return;
}
if(header.fmtChunk.waveFormatType != 1){
fprintf(stderr, "not PCM WAVE file\n");
return;
}
header_endp = fin.tellg();
printf("%ld bytes header end\n", header_endp);
if(header.fmtChunk.bitsPerSample == 8){
LoadData<uint8_t>(fin, header.fmtChunk.formatChannel);
}
else if(header.fmtChunk.bitsPerSample == 16){
LoadData<int16_t>(fin, header.fmtChunk.formatChannel);
}
}
}