Spactrum: allow arbitrary FPS (API) or in a range of FPS (GUI) with possible no limit. Implements #772

sdrgui/gui/glspectrumgui.cpp

@@ -32,6 +32,8 @@
 #include "util/db.h"
 #include "ui_glspectrumgui.h"
 
+const int GLSpectrumGUI::m_fpsMs[] = {500, 200, 100, 50, 20, 10, 5, 0};
+
 GLSpectrumGUI::GLSpectrumGUI(QWidget* parent) :
 	QWidget(parent),
 	ui(new Ui::GLSpectrumGUI),
@@ -144,6 +146,24 @@ void GLSpectrumGUI::displaySettings()
 		}
 	}
 
+    if (m_settings.m_fpsPeriodMs == 0)
+    {
+        ui->fps->setCurrentIndex(sizeof(m_fpsMs)/sizeof(m_fpsMs[0]) - 1);
+    }
+    else
+    {
+        unsigned int i = 0;
+
+        for (; i < sizeof(m_fpsMs)/sizeof(m_fpsMs[0]); i++)
+        {
+            if (m_settings.m_fpsPeriodMs >= m_fpsMs[i]) {
+                break;
+            }
+        }
+
+        ui->fps->setCurrentIndex(i);
+    }
+
     ui->fftOverlap->setValue(m_settings.m_fftOverlap);
     setMaximumOverlap();
 	ui->averaging->setCurrentIndex(m_settings.m_averagingIndex);
@@ -208,6 +228,7 @@ void GLSpectrumGUI::applyGLSpectrumSettings()
     qDebug("GLSpectrumGUI::applySettings: refLevel: %e powerRange: %e", refLevel, powerRange);
     m_glSpectrum->setReferenceLevel(refLevel);
     m_glSpectrum->setPowerRange(powerRange);
+    m_glSpectrum->setFPSPeriodMs(m_settings.m_fpsPeriodMs);
     m_glSpectrum->setLinear(m_settings.m_linear);
 }
 
@@ -323,6 +344,13 @@ void GLSpectrumGUI::on_levelRange_valueChanged(int value)
     applySettings();
 }
 
+void GLSpectrumGUI::on_fps_currentIndexChanged(int index)
+{
+    m_settings.m_fpsPeriodMs = m_fpsMs[index];
+    qDebug("GLSpectrumGUI::on_fps_currentIndexChanged: %d ms", m_settings.m_fpsPeriodMs);
+    applySettings();
+}
+
 void GLSpectrumGUI::on_decay_valueChanged(int index)
 {
 	m_settings.m_decay = index;