Add NBFM mode, add mode selector button height font reduction when scaled down

CMakeLists.txt

@@ -287,6 +287,7 @@ SET (cubicsdr_sources
     src/modules/modem/analog/ModemAM.cpp
     src/modules/modem/analog/ModemDSB.cpp
     src/modules/modem/analog/ModemFM.cpp
+    src/modules/modem/analog/ModemNBFM.cpp
     src/modules/modem/analog/ModemFMStereo.cpp
     src/modules/modem/analog/ModemIQ.cpp
     src/modules/modem/analog/ModemLSB.cpp
@@ -384,6 +385,7 @@ SET (cubicsdr_headers
     src/modules/modem/analog/ModemAM.h
     src/modules/modem/analog/ModemDSB.h
     src/modules/modem/analog/ModemFM.h
+    src/modules/modem/analog/ModemNBFM.h
     src/modules/modem/analog/ModemFMStereo.h
     src/modules/modem/analog/ModemIQ.h
     src/modules/modem/analog/ModemLSB.h

src/AppFrame.cpp

@@ -76,6 +76,7 @@ AppFrame::AppFrame() :
     demodModeSelector = new ModeSelectorCanvas(demodPanel, attribList);
     demodModeSelector->addChoice("FM");
     demodModeSelector->addChoice("FMS");
+    demodModeSelector->addChoice("NBFM");
     demodModeSelector->addChoice("AM");
     demodModeSelector->addChoice("LSB");
     demodModeSelector->addChoice("USB");
@@ -1940,7 +1941,9 @@ int AppFrame::OnGlobalKeyUp(wxKeyEvent &event) {
         case 'F':
             if (demodModeSelector->getSelectionLabel() == "FM") {
                 demodModeSelector->setSelection("FMS");
-            } else {
+            } else if (demodModeSelector->getSelectionLabel() == "FMS") {
+                demodModeSelector->setSelection("NBFM");
+            } else if (demodModeSelector->getSelectionLabel() == "NBFM") {
                 demodModeSelector->setSelection("FM");
             }
             return 1;

src/CubicSDR.cpp

@@ -179,6 +179,7 @@ bool CubicSDR::OnInit() {
 #endif
 
     Modem::addModemFactory(new ModemFM);
+    Modem::addModemFactory(new ModemNBFM);
     Modem::addModemFactory(new ModemFMStereo);
     Modem::addModemFactory(new ModemAM);
     Modem::addModemFactory(new ModemLSB);

src/CubicSDR.h

@@ -30,6 +30,7 @@
 #include "Modem.h"
 
 #include "ModemFM.h"
+#include "ModemNBFM.h"
 #include "ModemFMStereo.h"
 #include "ModemAM.h"
 #include "ModemUSB.h"

src/modules/modem/analog/ModemNBFM.cpp

@@ -0,0 +1,36 @@
+#include "ModemNBFM.h"
+
+ModemNBFM::ModemNBFM() : ModemAnalog() {
+    demodFM = freqdem_create(0.5);
+}
+
+ModemNBFM::~ModemNBFM() {
+    freqdem_destroy(demodFM);
+}
+
+Modem *ModemNBFM::factory() {
+    return new ModemNBFM;
+}
+
+std::string ModemNBFM::getName() {
+    return "NBFM";
+}
+
+int ModemNBFM::getDefaultSampleRate() {
+    return 12500;
+}
+
+void ModemNBFM::demodulate(ModemKit *kit, ModemIQData *input, AudioThreadInput *audioOut) {
+    ModemKitAnalog *fmkit = (ModemKitAnalog *)kit;
+    
+    initOutputBuffers(fmkit, input);
+    
+    if (!bufSize) {
+        input->decRefCount();
+        return;
+    }
+    
+    freqdem_demodulate_block(demodFM, &input->data[0], bufSize, &demodOutputData[0]);
+
+    buildAudioOutput(fmkit, audioOut, false);
+}

src/modules/modem/analog/ModemNBFM.h

@@ -0,0 +1,20 @@
+#pragma once
+#include "Modem.h"
+#include "ModemAnalog.h"
+
+class ModemNBFM : public ModemAnalog {
+public:
+    ModemNBFM();
+    ~ModemNBFM();
+    
+    std::string getName();
+    
+    Modem *factory();
+
+    int getDefaultSampleRate();
+
+    void demodulate(ModemKit *kit, ModemIQData *input, AudioThreadInput *audioOut);
+
+private:
+    freqdem demodFM;
+};

src/visual/ModeSelectorContext.cpp

@@ -33,7 +33,7 @@ void ModeSelectorContext::DrawSelector(std::string label, int c, int cMax, bool
 
     int fontHeight = 16;
 
-    if (viewWidth < 30) {
+    if (viewWidth < 30 || viewHeight < 200) {
         fontSize = GLFont::GLFONT_SIZE12;
         fontHeight = 12;
     }