dataanalyzer.cpp
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////////////////////////////////////////////////////////////////////////////////
//
// OpenHantek
// dataanalyzer.cpp
//
// Copyright (C) 2010 Oliver Haag
// oliver.haag@gmail.com
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program 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 General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along with
// this program. If not, see <http://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////////////
#include <cmath>
#include <QColor>
#include <QMutex>
#include <fftw3.h>
#include "dataanalyzer.h"
#include "glscope.h"
#include "helper.h"
#include "settings.h"
////////////////////////////////////////////////////////////////////////////////
// class HorizontalDock
/// \brief Initializes the buffers and other variables.
/// \param settings The settings that should be used.
/// \param parent The parent widget.
DataAnalyzer::DataAnalyzer(DsoSettings *settings, QObject *parent) : QThread(parent) {
this->settings = settings;
this->lastBufferSize = 0;
this->lastWindow = (Dso::WindowFunction) -1;
this->window = 0;
this->analyzedDataMutex = new QMutex();
}
/// \brief Deallocates the buffers.
DataAnalyzer::~DataAnalyzer() {
for(int channel = 0; channel < this->analyzedData.count(); channel++) {
if(this->analyzedData[channel]->samples.voltage.sample)
delete[] this->analyzedData[channel]->samples.voltage.sample;
if(this->analyzedData[channel]->samples.spectrum.sample)
delete[] this->analyzedData[channel]->samples.spectrum.sample;
}
}
/// \brief Returns the analyzed data.
/// \param channel Channel, whose data should be returned.
/// \return Analyzed data as AnalyzedData struct.
const AnalyzedData *DataAnalyzer::data(int channel) const {
if(channel < 0 || channel >= this->analyzedData.count())
return 0;
return this->analyzedData[channel];
}
/// \brief Returns the sample count of the analyzed data.
/// \return The maximum sample count of the last analyzed data.
unsigned long int DataAnalyzer::sampleCount() {
return this->maxSamples;
}
/// \brief Returns the mutex for the data.
/// \return Mutex for the analyzed data.
QMutex *DataAnalyzer::mutex() const {
return this->analyzedDataMutex;
}
/// \brief Analyzes the data from the dso.
void DataAnalyzer::run() {
this->analyzedDataMutex->lock();
unsigned long int maxSamples = 0;
// Adapt the number of channels for analyzed data
for(int channel = this->analyzedData.count(); channel < this->settings->scope.voltage.count(); channel++) {
this->analyzedData.append(new AnalyzedData);
this->analyzedData[channel]->samples.voltage.count = 0;
this->analyzedData[channel]->samples.voltage.interval = 0;
this->analyzedData[channel]->samples.voltage.sample = 0;
this->analyzedData[channel]->samples.spectrum.count = 0;
this->analyzedData[channel]->samples.spectrum.interval = 0;
this->analyzedData[channel]->samples.spectrum.sample = 0;
this->analyzedData[channel]->amplitude = 0;
this->analyzedData[channel]->frequency = 0;
}
for(int channel = this->settings->scope.voltage.count(); channel < this->analyzedData.count(); channel++) {
if(this->analyzedData.last()->samples.voltage.sample)
delete[] this->analyzedData.last()->samples.voltage.sample;
if(this->analyzedData.last()->samples.spectrum.sample)
delete[] this->analyzedData.last()->samples.spectrum.sample;
this->analyzedData.removeLast();
}
for(unsigned int channel = 0; channel < (unsigned int) this->analyzedData.count(); channel++) {
// Check if we got data for this channel or if it's a math channel that can be calculated
if(((channel < this->settings->scope.physicalChannels) && channel < (unsigned int) this->waitingData.count() && this->waitingData[channel]) || ((channel >= this->settings->scope.physicalChannels) && (this->settings->scope.voltage[channel].used || this->settings->scope.spectrum[channel].used) && this->analyzedData.count() >= 2 && this->analyzedData[0]->samples.voltage.sample && this->analyzedData[1]->samples.voltage.sample)) {
// Set sampling interval
this->analyzedData[channel]->samples.voltage.interval = 1.0 / this->waitingDataSamplerate;
unsigned int size;
if(channel < this->settings->scope.physicalChannels) {
size = this->waitingDataSize[channel];
if(size > maxSamples)
maxSamples = size;
}
else
size = maxSamples;
// Reallocate memory for samples if the sample count has changed
if(this->analyzedData[channel]->samples.voltage.count != size) {
this->analyzedData[channel]->samples.voltage.count = size;
if(this->analyzedData[channel]->samples.voltage.sample)
delete[] this->analyzedData[channel]->samples.voltage.sample;
this->analyzedData[channel]->samples.voltage.sample = new double[size];
}
// Physical channels
if(channel < this->settings->scope.physicalChannels) {
// Copy the buffer of the oscilloscope into the sample buffer
if(channel < (unsigned int) this->waitingData.count())
for(unsigned int position = 0; position < this->waitingDataSize[channel]; position++)
this->analyzedData[channel]->samples.voltage.sample[position] = this->waitingData[channel][position];
}
// Math channel
else {
// Set sampling interval
this->analyzedData[this->settings->scope.physicalChannels]->samples.voltage.interval = this->analyzedData[0]->samples.voltage.interval;
// Reallocate memory for samples if the sample count has changed
if(this->analyzedData[this->settings->scope.physicalChannels]->samples.voltage.count != this->analyzedData[0]->samples.voltage.count) {
this->analyzedData[this->settings->scope.physicalChannels]->samples.voltage.count = this->analyzedData[0]->samples.voltage.count;
if(this->analyzedData[this->settings->scope.physicalChannels]->samples.voltage.sample)
delete[] this->analyzedData[this->settings->scope.physicalChannels]->samples.voltage.sample;
this->analyzedData[this->settings->scope.physicalChannels]->samples.voltage.sample = new double[this->analyzedData[this->settings->scope.physicalChannels]->samples.voltage.count];
}
// Calculate values and write them into the sample buffer
for(unsigned int realPosition = 0; realPosition < this->analyzedData[this->settings->scope.physicalChannels]->samples.voltage.count; realPosition++) {
switch(this->settings->scope.voltage[this->settings->scope.physicalChannels].misc) {
case Dso::MATHMODE_1ADD2:
this->analyzedData[this->settings->scope.physicalChannels]->samples.voltage.sample[realPosition] = this->analyzedData[0]->samples.voltage.sample[realPosition] + this->analyzedData[1]->samples.voltage.sample[realPosition];
break;
case Dso::MATHMODE_1SUB2:
this->analyzedData[this->settings->scope.physicalChannels]->samples.voltage.sample[realPosition] = this->analyzedData[0]->samples.voltage.sample[realPosition] - this->analyzedData[1]->samples.voltage.sample[realPosition];
break;
case Dso::MATHMODE_2SUB1:
this->analyzedData[this->settings->scope.physicalChannels]->samples.voltage.sample[realPosition] = this->analyzedData[1]->samples.voltage.sample[realPosition] - this->analyzedData[0]->samples.voltage.sample[realPosition];
break;
}
}
}
}
else {
// Clear unused channels
this->analyzedData[channel]->samples.voltage.count = 0;
this->analyzedData[this->settings->scope.physicalChannels]->samples.voltage.interval = 0;
if(this->analyzedData[channel]->samples.voltage.sample) {
delete[] this->analyzedData[channel]->samples.voltage.sample;
this->analyzedData[channel]->samples.voltage.sample = 0;
}
}
}
this->waitingDataMutex->unlock();
// Lower priority for spectrum calculation
this->setPriority(QThread::LowPriority);
// Calculate peak-to-peak voltage and frequency
for(int channel = 0; channel < this->analyzedData.count(); channel++) {
if(this->settings->scope.voltage[channel].used && this->analyzedData[channel]->samples.voltage.sample) {
bool aboveTrigger = this->analyzedData[channel]->samples.voltage.sample[0] > this->settings->scope.voltage[channel].trigger;
double minimalVoltage, maximalVoltage;
unsigned int firstTrigger = 0, lastTrigger = 0;
int triggerCount = -1;
this->analyzedData[channel]->amplitude = 0;
minimalVoltage = maximalVoltage = this->analyzedData[channel]->samples.voltage.sample[0];
for(unsigned int position = 0; position < this->analyzedData[channel]->samples.voltage.count; position++) {
// Check trigger condition
if(aboveTrigger != (this->analyzedData[channel]->samples.voltage.sample[position] > this->settings->scope.voltage[channel].trigger)) {
aboveTrigger = this->analyzedData[channel]->samples.voltage.sample[position] > this->settings->scope.voltage[channel].trigger;
// We measure the time between two trigger slopes
if(aboveTrigger == (this->settings->scope.trigger.slope == Dso::SLOPE_POSITIVE)) {
triggerCount++;
if(triggerCount == 0)
firstTrigger = position;
else
this->analyzedData[channel]->amplitude += maximalVoltage - minimalVoltage;
minimalVoltage = this->analyzedData[channel]->samples.voltage.sample[position];
maximalVoltage = this->analyzedData[channel]->samples.voltage.sample[position];
lastTrigger = position;
}
}
else { // Get minimal and maximal voltage
if(this->analyzedData[channel]->samples.voltage.sample[position] < minimalVoltage)
minimalVoltage = this->analyzedData[channel]->samples.voltage.sample[position];
else if(this->analyzedData[channel]->samples.voltage.sample[position] > maximalVoltage)
maximalVoltage = this->analyzedData[channel]->samples.voltage.sample[position];
}
}
// Calculate values
if(triggerCount >= 0) {
this->analyzedData[channel]->amplitude /= triggerCount;
this->analyzedData[channel]->frequency = (double) triggerCount / (lastTrigger - firstTrigger) / this->analyzedData[channel]->samples.voltage.interval;
}
else {
this->analyzedData[channel]->amplitude = maximalVoltage - minimalVoltage;
this->analyzedData[channel]->frequency = 0;
}
}
}
// Calculate spectrums
for(int channel = 0; channel < this->analyzedData.count(); channel++) {
if(this->settings->scope.spectrum[channel].used && this->analyzedData[channel]->samples.voltage.sample) {
// Calculate new window
if(this->lastWindow != this->settings->scope.spectrumWindow || this->lastBufferSize != this->analyzedData[channel]->samples.voltage.count) {
if(this->lastBufferSize != this->analyzedData[channel]->samples.voltage.count) {
this->lastBufferSize = this->analyzedData[channel]->samples.voltage.count;
if(this->window)
fftw_free(this->window);
this->window = (double *) fftw_malloc(sizeof(double) * this->lastBufferSize);
}
unsigned int windowEnd = this->lastBufferSize - 1;
this->lastWindow = this->settings->scope.spectrumWindow;
switch(this->settings->scope.spectrumWindow) {
case Dso::WINDOW_HAMMING:
for(unsigned int windowPosition = 0; windowPosition < this->lastBufferSize; windowPosition++)
*(this->window + windowPosition) = 0.54 - 0.46 * cos(2.0 * M_PI * windowPosition / windowEnd);
break;
case Dso::WINDOW_HANN:
for(unsigned int windowPosition = 0; windowPosition < this->lastBufferSize; windowPosition++)
*(this->window + windowPosition) = 0.5 * (1.0 - cos(2.0 * M_PI * windowPosition / windowEnd));
break;
case Dso::WINDOW_COSINE:
for(unsigned int windowPosition = 0; windowPosition < this->lastBufferSize; windowPosition++)
*(this->window + windowPosition) = sin(M_PI * windowPosition / windowEnd);
break;
case Dso::WINDOW_LANCZOS:
for(unsigned int windowPosition = 0; windowPosition < this->lastBufferSize; windowPosition++) {
double sincParameter = (2.0 * windowPosition / windowEnd - 1.0) * M_PI;
if(sincParameter == 0)
*(this->window + windowPosition) = 1;
else
*(this->window + windowPosition) = sin(sincParameter) / sincParameter;
}
break;
case Dso::WINDOW_BARTLETT:
for(unsigned int windowPosition = 0; windowPosition < this->lastBufferSize; windowPosition++)
*(this->window + windowPosition) = 2.0 / windowEnd * (windowEnd / 2 - abs(windowPosition - windowEnd / 2));
break;
case Dso::WINDOW_TRIANGULAR:
for(unsigned int windowPosition = 0; windowPosition < this->lastBufferSize; windowPosition++)
*(this->window + windowPosition) = 2.0 / this->lastBufferSize * (this->lastBufferSize / 2 - abs(windowPosition - windowEnd / 2));
break;
case Dso::WINDOW_GAUSS:
{
double sigma = 0.4;
for(unsigned int windowPosition = 0; windowPosition < this->lastBufferSize; windowPosition++)
*(this->window + windowPosition) = exp(-0.5 * pow(((windowPosition - windowEnd / 2) / (sigma * windowEnd / 2)), 2));
}
break;
case Dso::WINDOW_BARTLETTHANN:
for(unsigned int windowPosition = 0; windowPosition < this->lastBufferSize; windowPosition++)
*(this->window + windowPosition) = 0.62 - 0.48 * abs(windowPosition / windowEnd - 0.5) - 0.38 * cos(2.0 * M_PI * windowPosition / windowEnd);
break;
case Dso::WINDOW_BLACKMAN:
{
double alpha = 0.16;
for(unsigned int windowPosition = 0; windowPosition < this->lastBufferSize; windowPosition++)
*(this->window + windowPosition) = (1 - alpha) / 2 - 0.5 * cos(2.0 * M_PI * windowPosition / windowEnd) + alpha / 2 * cos(4.0 * M_PI * windowPosition / windowEnd);
}
break;
//case WINDOW_KAISER:
// TODO
//double alpha = 3.0;
//for(unsigned int windowPosition = 0; windowPosition < this->lastBufferSize; windowPosition++)
//*(this->window + windowPosition) = ;
//break;
case Dso::WINDOW_NUTTALL:
for(unsigned int windowPosition = 0; windowPosition < this->lastBufferSize; windowPosition++)
*(this->window + windowPosition) = 0.355768 - 0.487396 * cos(2 * M_PI * windowPosition / windowEnd) + 0.144232 * cos(4 * M_PI * windowPosition / windowEnd) - 0.012604 * cos(6 * M_PI * windowPosition / windowEnd);
break;
case Dso::WINDOW_BLACKMANHARRIS:
for(unsigned int windowPosition = 0; windowPosition < this->lastBufferSize; windowPosition++)
*(this->window + windowPosition) = 0.35875 - 0.48829 * cos(2 * M_PI * windowPosition / windowEnd) + 0.14128 * cos(4 * M_PI * windowPosition / windowEnd) - 0.01168 * cos(6 * M_PI * windowPosition / windowEnd);
break;
case Dso::WINDOW_BLACKMANNUTTALL:
for(unsigned int windowPosition = 0; windowPosition < this->lastBufferSize; windowPosition++)
*(this->window + windowPosition) = 0.3635819 - 0.4891775 * cos(2 * M_PI * windowPosition / windowEnd) + 0.1365995 * cos(4 * M_PI * windowPosition / windowEnd) - 0.0106411 * cos(6 * M_PI * windowPosition / windowEnd);
break;
case Dso::WINDOW_FLATTOP:
for(unsigned int windowPosition = 0; windowPosition < this->lastBufferSize; windowPosition++)
*(this->window + windowPosition) = 1.0 - 1.93 * cos(2 * M_PI * windowPosition / windowEnd) + 1.29 * cos(4 * M_PI * windowPosition / windowEnd) - 0.388 * cos(6 * M_PI * windowPosition / windowEnd) + 0.032 * cos(8 * M_PI * windowPosition / windowEnd);
break;
default: // Dso::WINDOW_RECTANGULAR
for(unsigned int windowPosition = 0; windowPosition < this->lastBufferSize; windowPosition++)
*(this->window + windowPosition) = 1.0;
}
}
// Set sampling interval
this->analyzedData[channel]->samples.spectrum.interval = 1.0 / this->analyzedData[channel]->samples.voltage.interval / this->analyzedData[channel]->samples.voltage.count;
// Reallocate memory for samples if the sample count has changed
if(this->analyzedData[channel]->samples.spectrum.count != this->analyzedData[channel]->samples.voltage.count / 2) {
this->analyzedData[channel]->samples.spectrum.count = this->analyzedData[channel]->samples.voltage.count / 2;
if(this->analyzedData[channel]->samples.spectrum.sample)
delete[] this->analyzedData[channel]->samples.spectrum.sample;
this->analyzedData[channel]->samples.spectrum.sample = new double[this->analyzedData[channel]->samples.voltage.count];
}
// Create sample buffer and apply window
double *windowedValues = new double[this->analyzedData[channel]->samples.voltage.count];
for(unsigned int position = 0; position < this->analyzedData[channel]->samples.voltage.count; position++)
windowedValues[position] = this->window[position] * this->analyzedData[channel]->samples.voltage.sample[position];
// Do discrete real to half-complex transformation
// TODO: Reuse plan and use FFTW_MEASURE to get fastest algorithm
fftw_plan fftPlan = fftw_plan_r2r_1d(this->analyzedData[channel]->samples.voltage.count, windowedValues, this->analyzedData[channel]->samples.spectrum.sample, FFTW_R2HC, FFTW_ESTIMATE);
fftw_execute(fftPlan);
fftw_destroy_plan(fftPlan);
// Deallocate sample buffer
delete[] windowedValues;
// Convert values into dB (Relative to the reference level)
double offset = 60 - this->settings->scope.spectrumReference - 20 * log10(sqrt(this->analyzedData[channel]->samples.spectrum.count));
double offsetLimit = this->settings->scope.spectrumLimit - this->settings->scope.spectrumReference;
for(unsigned int position = 0; position < this->analyzedData[channel]->samples.spectrum.count; position++) {
this->analyzedData[channel]->samples.spectrum.sample[position] = 20 * log10(fabs(this->analyzedData[channel]->samples.spectrum.sample[position])) + offset;
// Check if this value has to be limited
if(offsetLimit > this->analyzedData[channel]->samples.spectrum.sample[position])
this->analyzedData[channel]->samples.spectrum.sample[position] = offsetLimit;
}
}
else if(this->analyzedData[channel]->samples.spectrum.sample) {
// Clear unused channels
this->analyzedData[channel]->samples.spectrum.count = 0;
this->analyzedData[channel]->samples.spectrum.interval = 0;
delete[] this->analyzedData[channel]->samples.spectrum.sample;
this->analyzedData[channel]->samples.spectrum.sample = 0;
}
}
this->maxSamples = maxSamples;
emit(analyzed(maxSamples));
this->analyzedDataMutex->unlock();
}
/// \brief Starts the analyzing of new input data.
/// \param data The data arrays with the input data.
/// \param size The sizes of the data arrays.
/// \param samplerate The samplerate for all input data.
/// \param mutex The mutex for all input data.
void DataAnalyzer::analyze(const QList<double *> *data, const QList<unsigned int> *size, double samplerate, QMutex *mutex) {
// Previous analysis still running, drop the new data
if(this->isRunning())
return;
// The thread will analyze it, just save the pointers
mutex->lock();
this->waitingData.clear();
this->waitingData.append(*data);
this->waitingDataSize.clear();
this->waitingDataSize.append(*size);
this->waitingDataMutex = mutex;
this->waitingDataSamplerate = samplerate;
this->start();
}