Modem, ModemKit and initial ModemAnalog refactor

src/modules/modem/analog/ModemAM.cpp

@@ -0,0 +1,24 @@
+#include "ModemAM.h"
+
+ModemAM::ModemAM() {
+    demodAM = ampmodem_create(0.5, 0.0, LIQUID_AMPMODEM_DSB, 0);
+}
+
+Modem *ModemAM::factory() {
+    return new ModemAM;
+}
+
+void ModemAM::demodulate(ModemKit *kit, ModemIQData *input, AudioThreadInput *audioOut) {
+    ModemKitAnalog *amkit = (ModemKitAnalog *)kit;
+    
+    initOutputBuffers(amkit,input);
+    
+    if (!bufSize) {
+        input->decRefCount();
+        return;
+    }
+    
+    ampmodem_demodulate_block(demodAM, &input->data[0], bufSize, &demodOutputData[0]);
+    
+    buildAudioOutput(amkit,audioOut,true);
+}