Use double for sample rate

Fixes #158

inputsource.cpp

@@ -155,13 +155,13 @@ void InputSource::openFile(const char *filename)
     invalidate();
 }
 
-void InputSource::setSampleRate(size_t rate)
+void InputSource::setSampleRate(double rate)
 {
     sampleRate = rate;
     invalidate();
 }
 
-size_t InputSource::rate()
+double InputSource::rate()
 {
     return sampleRate;
 }

inputsource.h

@@ -35,7 +35,7 @@ class InputSource : public SampleSource<std::complex<float>>
 private:
     QFile *inputFile = nullptr;
     size_t sampleCount = 0;
-    size_t sampleRate = 0;
+    double sampleRate = 0.0;
     uchar *mmapData = nullptr;
     std::unique_ptr<SampleAdapter> sampleAdapter;
     std::string _fmt;
@@ -49,9 +49,9 @@ public:
     size_t count() {
         return sampleCount;
     };
-    void setSampleRate(size_t rate);
+    void setSampleRate(double rate);
     void setFormat(std::string fmt);
-    size_t rate();
+    double rate();
     float relativeBandwidth() {
         return 1;
     }

main.cpp

@@ -59,8 +59,7 @@ int main(int argc, char *argv[])
 
     if (parser.isSet(rateOption)) {
         bool ok;
-        // Use toDouble just for scientific notation support
-        int rate = parser.value(rateOption).toDouble(&ok);
+        auto rate = parser.value(rateOption).toDouble(&ok);
         if(!ok) {
             fputs("ERROR: could not parse rate\n", stderr);
             return 1;

mainwindow.cpp

@@ -98,7 +98,7 @@ void MainWindow::openFile(QString fileName)
 
 void MainWindow::setSampleRate(QString rate)
 {
-    int sampleRate = rate.toInt();
+    auto sampleRate = rate.toDouble();
     input->setSampleRate(sampleRate);
     plots->setSampleRate(sampleRate);
 
@@ -107,7 +107,7 @@ void MainWindow::setSampleRate(QString rate)
     settings.setValue("SampleRate", sampleRate);
 }
 
-void MainWindow::setSampleRate(int rate)
+void MainWindow::setSampleRate(double rate)
 {
     dock->sampleRate->setText(QString::number(rate));
 }

mainwindow.h

@@ -30,12 +30,12 @@ class MainWindow : public QMainWindow
 
 public:
     MainWindow();
-    void changeSampleRate(int rate);
+    void changeSampleRate(double rate);
 
 public slots:
     void openFile(QString fileName);
     void setSampleRate(QString rate);
-    void setSampleRate(int rate);
+    void setSampleRate(double rate);
     void setFormat(QString fmt);
 
 private:

plotview.cpp

@@ -563,7 +563,7 @@ void PlotView::updateView(bool reCenter)
     viewport()->update();
 }
 
-void PlotView::setSampleRate(size_t rate)
+void PlotView::setSampleRate(double rate)
 {
     sampleRate = rate;
 

plotview.h

@@ -35,7 +35,7 @@ class PlotView : public QGraphicsView, Subscriber
 
 public:
     PlotView(InputSource *input);
-    void setSampleRate(size_t rate);
+    void setSampleRate(double rate);
 
 signals:
     void timeSelectionChanged(float time);
@@ -75,7 +75,7 @@ private:
     int powerMin;
     int powerMax;
     bool cursorsEnabled;
-    size_t sampleRate = 0;
+    double sampleRate = 0.0;
     bool timeScaleEnabled;
     int scrollZoomStepsAccumulated = 0;
 

samplebuffer.h

@@ -40,7 +40,7 @@ public:
     virtual size_t count() {
         return src->count();
     };
-    size_t rate() {
+    double rate() {
         return src->rate();
     };
 

samplesource.h

@@ -33,7 +33,7 @@ public:
     virtual std::unique_ptr<T[]> getSamples(size_t start, size_t length) = 0;
     virtual void invalidateEvent() { };
     virtual size_t count() = 0;
-    virtual size_t rate() = 0;
+    virtual double rate() = 0;
     virtual float relativeBandwidth() = 0;
     std::type_index sampleType() override;
 };

spectrogramcontrols.cpp

@@ -36,7 +36,9 @@ SpectrogramControls::SpectrogramControls(const QString & title, QWidget * parent
     layout->addRow(fileOpenButton);
 
     sampleRate = new QLineEdit();
-    sampleRate->setValidator(new QIntValidator(this));
+    auto double_validator = new QDoubleValidator(this);
+    double_validator->setBottom(0.0);
+    sampleRate->setValidator(double_validator);
     layout->addRow(new QLabel(tr("Sample rate:")), sampleRate);
 
     // Spectrogram settings