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fingerprint-extractor.cpp
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fingerprint-extractor.cpp
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#include <iostream>
#include <iomanip>
#include <fstream>
#include <cstdio>
#include <thread>
#include <vector>
#include <string>
#include <bitset>
#include <cstring>
#include <cmath>
#include <ctime>
#include <algorithm>
#include "fingerprint-extractor.h"
#include "util.h"
#include "type.h"
using namespace std;
const double freq_bind[] =
{ 300.000, 317.752, 336.554, 356.469, 377.563,
399.904, 423.568, 448.632, 475.178, 503.296,
533.078, 564.622, 598.032, 633.419, 670.901,
710.600, 752.648, 797.185, 844.357, 894.320,
947.240, 1003.29, 1062.66, 1125.54, 1192.14,
1262.68, 1337.40, 1416.54, 1500.36, 1589.14,
1683.17, 1782.77, 1888.27, 2000.00 }; //划分的频带 [0, 33]
FingerExtractor::~FingerExtractor() {}
void FingerExtractor::CalcFingerprint(const string waveFilePath) {
this->_wavepath = waveFilePath;
_wp.Clear();
_wp.OpenWaveFile(waveFilePath.c_str());
_wp.MakeTargetSamplesData();
unsigned long all_time_data_size = 0;
_wp.GetSamplesVector(_all_time_data, all_time_data_size);
_wp.CloseWaveFile();
_Energying(all_time_data_size);
_Fingerprinting();
}
int FingerExtractor::_SelectBind(double point_freq) {
int start = 0;
int end = 33;
int mid = 0;
while (start <= end) {
mid = (end + start) / 2;
if (point_freq < freq_bind[mid])
end = mid - 1;
else if (point_freq > freq_bind[mid + 1])
start = mid + 1;
else
return mid;
}
return -1;
}
int FingerExtractor::_Energying(long all_time_data_size) {
//clock_t FFT_start, FFT_end;
memset(_energy, 0, sizeof(double)* QUERY_FINGER_NUM * 33);
_frame_num = 0;
int start = 0;
int jump_samples = (int)(sampleRate * TIME_INTERVAL);
while (start + NumSamplesPerFrameM < all_time_data_size) {
short time_data[1850];
cpxv_t freq_data[2048];
double bind_energy[33];
memset(bind_energy, 0, sizeof(double)* 33);
for (int i = 0; i < NumSamplesPerFrameM; i++) {
time_data[i] = _all_time_data[i + start];
}
//FFT_start = clock();
DoFFT(time_data, freq_data);
//FFT_end = clock();
//duration_FFT += (double)(FFT_end - FFT_start) / CLOCKS_PER_SEC;
double point_freq = 0;
_log_power.push_back(vector<double>(NumBinsInFftWinM));
for (int i = 0; i < NumBinsInFftWinM; i++) {
double power = (freq_data[i].re * freq_data[i].re + freq_data[i].im * freq_data[i].im);
_log_power[_frame_num][i] = max(0.0, log(power));
//FFT结果第n个点代表的频率值
point_freq = (i + 1) * sampleRate / NumBinsInFftWinM;
if (point_freq < 300 || point_freq > 2000) {
continue;
} else {
int bind = _SelectBind(point_freq); // [0,32]
bind_energy[bind] += sqrt(power);
}
}
for (int i = 0; i < 33; i++)
_energy[_frame_num][i] = bind_energy[i];
//下一帧
_frame_num++;
start += jump_samples;
}
//#endif
return _frame_num;
}
void FingerExtractor::_Fingerprinting() {
//第0帧
for (int j = 0; j < 32; j++) {
if (_energy[0][j] - _energy[0][j + 1] > 0)
_fingers[0][j] = '1';
else
_fingers[0][j] = '0';
}
for (int i = 1; i < _frame_num; i++) {
for (int j = 0; j < 32; j++) {
if (_energy[i][j] - _energy[i][j + 1] - (_energy[i - 1][j] - _energy[i - 1][j + 1]) > 0)
_fingers[i][j] = '1';
else
_fingers[i][j] = '0';
}
}
}
void FingerExtractor::OutputTrainingSamples(const string& x_path,
const string& y_path) {
fstream fout_x, fout_y;
fout_x.open(x_path, fstream::app);
fout_y.open(y_path, fstream::app);
int batch_size = 100;
int jump = 10;
int output_samples = _frame_num / (batch_size * jump) * batch_size * jump;
for (int i = 0; i < output_samples; i += jump) {
for (int j = 0; j < NumBinsInFftWinM; j++) {
fout_x << setprecision(2) << std::fixed << _log_power[i][j] << "\t";
}
fout_x << endl;
}
for (int i = 0; i < output_samples; i += jump) {
for (int j = 0; j < 32; j++) {
fout_y << _fingers[i][j] << "\t";
}
fout_y << endl;
}
fout_x.close();
fout_y.close();
}
void FingerExtractor::GetQueryFinger(FingerItem* new_finger, int& size) {
size = _frame_num;
for (int i = 0; i < _frame_num; i++) {
new_finger[i] = bitset<32>(_fingers[i]);
}
return;
}
int FingerExtractor::GetFingerFileId() {
string originFile = _wavepath.substr(_wavepath.find_last_of("\\") + 1, _wavepath.size());
return stoi(originFile.substr(0, originFile.find(".")));
}
int FingerExtractor::PrintFingerToFile(const string fingerFile) {
FILE *fp = fopen(fingerFile.c_str(), "w");
string sub_finger;
for (int i = 0; i < _frame_num; i++) {
sub_finger = "";
for (int j = 0; j < 32; j++)
sub_finger.push_back(_fingers[i][j]);
bitset<32> b(sub_finger);
fprintf(fp, "%lu\n", b.to_ulong());
}
fclose(fp);
return 0;
}