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/*
* WaveAnalyzer.cpp
*
* Created on: 02.04.2011
* Author: sven
*/
#ifndef WAVEANALYZER_H_
#include "WaveAnalyzer.h"
#endif
#ifndef _GLIBCXX_FSTREAM
#include <fstream>
#endif
#ifndef _GLIBCXX_IOSTREAM
#include <iostream>
#endif
#ifndef _GLIBCXX_CMATH
#include <cmath>
#endif
#ifndef _GLIBCXX_MAP
#include <map>
#endif
#ifndef _GLIBCXX_NUMERIC_LIMITS
#include <limits>
#endif
WaveAnalyzer::WaveAnalyzer() {
// TODO Auto-generated constructor stub
}
WaveAnalyzer::~WaveAnalyzer() {
// TODO Auto-generated destructor stub
}
long double WaveAnalyzer::calcSNR(std::string& fullQuantFilename, std::string& lowQuantFilename)
{
long double result = 0.0;
double sumXnSquare = 0.0;
double sumDiffSquare = 0.0;
std::ifstream fullQuantFile;
std::ifstream lowQuantFile;
fullQuantFile.open(fullQuantFilename.c_str(), std::ios::in|std::ios::binary);
lowQuantFile.open(lowQuantFilename.c_str(), std::ios::in|std::ios::binary);
int dataLenOffset = 0x28;
fullQuantFile.seekg(dataLenOffset,std::ios_base::cur);
int numSamples = 0;
fullQuantFile.read((char*) &numSamples, sizeof(numSamples));
lowQuantFile.seekg(dataLenOffset+sizeof(numSamples),std::ios_base::cur);
double fullVal = 0.0;
double lowVal = 0.0;
short data = 0;
int diff = 0;
for(int i=0; i < numSamples; ) {
fullQuantFile.read((char*) &data, sizeof(data));
fullVal = (double)(data);
//std::cout << "full: " << data << " "<< fullVal << std::endl;
lowQuantFile.read((char*) &data, sizeof(data));
lowVal = (double)(data);
//std::cout << "low: " << data << " "<< lowVal << std::endl;
sumXnSquare += (fullVal * fullVal);
//std::cout << "Sum Xn Square: " << sumXnSquare << std::endl;
diff = lowVal - fullVal;
sumDiffSquare += (diff * diff);
//std::cout << "Sum Diff Square: " << sumDiffSquare << std::endl;
i += sizeof(data);
}
if (sumDiffSquare != 0.0) {
result = 10.0 * std::log10(sumXnSquare / sumDiffSquare);
} else {
result = std::numeric_limits<long double>::infinity();
}
fullQuantFile.close();
lowQuantFile.close();
return result;
}
long double WaveAnalyzer::calcArithAvg(std::string& wavefilename)
{
long double result = 0.0;
int sum = 0;
std::ifstream waveFile;
waveFile.open(wavefilename.c_str(), std::ios::in|std::ios::binary);
int dataLenOffset = 0x28;
waveFile.seekg(dataLenOffset,std::ios_base::cur);
int numSamples = 0;
waveFile.read((char*) &numSamples, sizeof(numSamples));
short data = 0;
for(int i=0 ; i < numSamples; ) {
waveFile.read((char*) &data, sizeof(data));
sum += data;
i+=sizeof(data);
}
result = ((long double) sum)/((long double)numSamples);
waveFile.close();
return result;
}
long double WaveAnalyzer::calcVariance(std::string& wavefilename)
{
long double variance = 0.0;
std::map<short,statVal*> statMap;
std::ifstream waveFile;
waveFile.open(wavefilename.c_str(), std::ios::in|std::ios::binary);
UInt32 dataLenOffset = 0x28;
waveFile.seekg(dataLenOffset,std::ios_base::cur);
UInt32 numBytes = 0;
waveFile.read((char*) &numBytes, sizeof(numBytes));
UInt32 numSamples = numBytes / sizeof(short);
for(UInt32 i=0 ; i < numSamples; i++) {
short data = 0;
waveFile.read((char*) &data, sizeof(data));
std::map<short,statVal*>::iterator findIt = statMap.find(data);
if (findIt == statMap.end()) {
statVal* vPtr = new statVal;
vPtr->count = 1UL;
vPtr->p = 0.0;
statMap.insert(std::make_pair(data,vPtr));
} else {
findIt->second->count++;
}
}
waveFile.close();
long double expectation = 0.0;
std::map<short,statVal*>::iterator it;
long double pSum = 0.0;
for(it = statMap.begin() ; it != statMap.end(); it++)
{
long double x = (long double) it->first;
it->second->p = (long double) it->second->count / (long double) numSamples;
long double actExp = (x * it->second->p);
expectation += actExp;
pSum += it->second->p;
}
std::cout << "expectation: " << expectation << " pSum: " << pSum << std::endl;
for(it = statMap.begin() ; it != statMap.end(); it++)
{
long double x = (long double) it->first;
long double diff = x - expectation;
long double diffQuad = (diff*diff);
variance += diffQuad * it->second->p;
}
for (it = statMap.begin() ; it != statMap.end();) {
delete it->second;
it++;
}
statMap.clear();
return variance;
}
long double WaveAnalyzer::calcStdDeviation(std::string& wavefilename)
{
return std::sqrt(calcVariance(wavefilename));
}
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