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

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;
+};