RTL-SDR: implemented baseband or device sample rate input option

plugins/samplesource/rtlsdr/rtlsdrgui.cpp

@@ -39,6 +39,7 @@ RTLSDRGui::RTLSDRGui(DeviceUISet *deviceUISet, QWidget* parent) :
 	m_doApplySettings(true),
 	m_forceSettings(true),
 	m_settings(),
+    m_sampleRateMode(true),
 	m_sampleSource(0),
 	m_lastEngineState(DSPDeviceSourceEngine::StNotStarted)
 {
@@ -49,7 +50,6 @@ RTLSDRGui::RTLSDRGui(DeviceUISet *deviceUISet, QWidget* parent) :
 	updateFrequencyLimits();
 
     ui->sampleRate->setColorMapper(ColorMapper(ColorMapper::GrayGreenYellow));
-    ui->sampleRate->setValueRange(7, RTLSDRInput::sampleRateHighRangeMin, RTLSDRInput::sampleRateHighRangeMax);
 
     ui->rfBW->setColorMapper(ColorMapper(ColorMapper::GrayYellow));
     ui->rfBW->setValueRange(4, 350, 8000);
@@ -202,7 +202,7 @@ void RTLSDRGui::updateSampleRateAndFrequency()
 {
     m_deviceUISet->getSpectrum()->setSampleRate(m_sampleRate);
     m_deviceUISet->getSpectrum()->setCenterFrequency(m_deviceCenterFrequency);
-    ui->deviceRateText->setText(tr("%1k").arg(QString::number(m_sampleRate / 1000.0f, 'g', 5)));
+    displaySampleRate();
 }
 
 void RTLSDRGui::updateFrequencyLimits()
@@ -249,13 +249,53 @@ void RTLSDRGui::displayGains()
     }
 }
 
+void RTLSDRGui::displaySampleRate()
+{
+    ui->sampleRateMode->setStyleSheet("QToolButton { background:rgb(79,79,79); }");
+    ui->sampleRate->blockSignals(true);
+
+    if (m_sampleRateMode)
+    {
+        ui->sampleRateMode->setText("SR");
+
+        if (m_settings.m_lowSampleRate) {
+            ui->sampleRate->setValueRange(7, RTLSDRInput::sampleRateLowRangeMin, RTLSDRInput::sampleRateLowRangeMax);
+        } else {
+            ui->sampleRate->setValueRange(7, RTLSDRInput::sampleRateHighRangeMin, RTLSDRInput::sampleRateHighRangeMax);
+        }
+
+        ui->sampleRate->setValue(m_settings.m_devSampleRate);
+        ui->sampleRate->setToolTip("Device to host sample rate (S/s)");
+        ui->deviceRateText->setToolTip("Baseband sample rate (S/s)");
+        uint32_t basebandSampleRate = m_settings.m_devSampleRate/(1<<m_settings.m_log2Decim);
+        ui->deviceRateText->setText(tr("%1k").arg(QString::number(basebandSampleRate / 1000.0f, 'g', 5)));
+    }
+    else
+    {
+        ui->sampleRateMode->setText("BB");
+
+        if (m_settings.m_lowSampleRate) {
+            ui->sampleRate->setValueRange(7, RTLSDRInput::sampleRateLowRangeMin/(1<<m_settings.m_log2Decim), RTLSDRInput::sampleRateLowRangeMax/(1<<m_settings.m_log2Decim));
+        } else {
+            ui->sampleRate->setValueRange(7, RTLSDRInput::sampleRateHighRangeMin/(1<<m_settings.m_log2Decim), RTLSDRInput::sampleRateHighRangeMax/(1<<m_settings.m_log2Decim));
+        }
+
+        ui->sampleRate->setValue(m_settings.m_devSampleRate/(1<<m_settings.m_log2Decim));
+        ui->sampleRate->setToolTip("Baseband sample rate (S/s)");
+        ui->deviceRateText->setToolTip("Device to host sample rate (S/s)");
+        ui->deviceRateText->setText(tr("%1k").arg(QString::number(m_settings.m_devSampleRate / 1000.0f, 'g', 5)));
+    }
+
+    ui->sampleRate->blockSignals(false);
+}
+
 void RTLSDRGui::displaySettings()
 {
     ui->transverter->setDeltaFrequency(m_settings.m_transverterDeltaFrequency);
     ui->transverter->setDeltaFrequencyActive(m_settings.m_transverterMode);
     updateFrequencyLimits();
 	ui->centerFrequency->setValue(m_settings.m_centerFrequency / 1000);
-	ui->sampleRate->setValue(m_settings.m_devSampleRate);
+	displaySampleRate();
 	ui->rfBW->setValue(m_settings.m_rfBandwidth / 1000);
 	ui->dcOffset->setChecked(m_settings.m_dcBlock);
 	ui->iqImbalance->setChecked(m_settings.m_iqImbalance);
@@ -285,12 +325,18 @@ void RTLSDRGui::on_centerFrequency_changed(quint64 value)
 
 void RTLSDRGui::on_decim_currentIndexChanged(int index)
 {
-	if ((index <0) || (index > 6))
+	if ((index <0) || (index > 6)) {
-	{
 		return;
 	}
 
 	m_settings.m_log2Decim = index;
+    displaySampleRate();
+
+    if (m_sampleRateMode) {
+        m_settings.m_devSampleRate = ui->sampleRate->getValueNew();
+    } else {
+        m_settings.m_devSampleRate = ui->sampleRate->getValueNew() * (1 << m_settings.m_log2Decim);
+    }
 
 	sendSettings();
 }
@@ -367,6 +413,12 @@ void RTLSDRGui::on_transverter_clicked()
     sendSettings();
 }
 
+void RTLSDRGui::on_sampleRateMode_toggled(bool checked)
+{
+    m_sampleRateMode = checked;
+    displaySampleRate();
+}
+
 void RTLSDRGui::updateHardware()
 {
     if (m_doApplySettings)
@@ -443,7 +495,12 @@ void RTLSDRGui::on_agc_stateChanged(int state)
 
 void RTLSDRGui::on_sampleRate_changed(quint64 value)
 {
-    m_settings.m_devSampleRate = value;
+    if (m_sampleRateMode) {
+        m_settings.m_devSampleRate = value;
+    } else {
+        m_settings.m_devSampleRate = value * (1 << m_settings.m_log2Decim);
+    }
+
     sendSettings();
 }
 
@@ -463,14 +520,16 @@ void RTLSDRGui::on_lowSampleRate_toggled(bool checked)
 {
     m_settings.m_lowSampleRate = checked;
 
-    if (m_settings.m_lowSampleRate) {
+    displaySampleRate();
-        ui->sampleRate->setValueRange(7, RTLSDRInput::sampleRateLowRangeMin, RTLSDRInput::sampleRateLowRangeMax);
+
+    if (m_sampleRateMode) {
+        m_settings.m_devSampleRate = ui->sampleRate->getValueNew();
     } else {
-        ui->sampleRate->setValueRange(7, RTLSDRInput::sampleRateHighRangeMin, RTLSDRInput::sampleRateHighRangeMax);
+        m_settings.m_devSampleRate = ui->sampleRate->getValueNew() * (1 << m_settings.m_log2Decim);
     }
 
-    m_settings.m_devSampleRate = ui->sampleRate->getValueNew();
     qDebug("RTLSDRGui::on_lowSampleRate_toggled: %d S/s", m_settings.m_devSampleRate);
+
     sendSettings();
 }
 

plugins/samplesource/rtlsdr/rtlsdrgui.h

@@ -58,6 +58,7 @@ private:
     bool m_doApplySettings;
 	bool m_forceSettings;
 	RTLSDRSettings m_settings;
+    bool m_sampleRateMode; //!< true: device, false: base band sample rate update mode
 	QTimer m_updateTimer;
 	QTimer m_statusTimer;
 	std::vector<int> m_gains;
@@ -68,6 +69,7 @@ private:
 	MessageQueue m_inputMessageQueue;
 
 	void displayGains();
+    void displaySampleRate();
 	void displaySettings();
 	void sendSettings();
 	void updateSampleRateAndFrequency();
@@ -92,6 +94,7 @@ private slots:
 	void on_startStop_toggled(bool checked);
     void on_record_toggled(bool checked);
     void on_transverter_clicked();
+    void on_sampleRateMode_toggled(bool checked);
     void openDeviceSettingsDialog(const QPoint& p);
 	void updateHardware();
 	void updateStatus();

plugins/samplesource/rtlsdr/rtlsdrgui.ui

@@ -348,16 +348,31 @@
       </widget>
      </item>
      <item>
-      <widget class="QLabel" name="samplerateLabel">
+      <widget class="QToolButton" name="sampleRateMode">
-       <property name="sizePolicy">
+       <property name="minimumSize">
-        <sizepolicy hsizetype="Maximum" vsizetype="Preferred">
+        <size>
-         <horstretch>0</horstretch>
+         <width>26</width>
-         <verstretch>0</verstretch>
+         <height>0</height>
-        </sizepolicy>
+        </size>
+       </property>
+       <property name="maximumSize">
+        <size>
+         <width>26</width>
+         <height>16777215</height>
+        </size>
+       </property>
+       <property name="toolTip">
+        <string>Toggle between device to host and base band sample rate input</string>
        </property>
        <property name="text">
         <string>SR</string>
        </property>
+       <property name="checkable">
+        <bool>true</bool>
+       </property>
+       <property name="checked">
+        <bool>true</bool>
+       </property>
       </widget>
      </item>
      <item>