Fixes to allow Compilation using VC++ 12

Some minor fixes and tweaks to allow compilation under Visual C++ 12.
This doesn't include changes that I need to make to the build
generation.

external/rtaudio/RtAudio.cpp

@@ -45,6 +45,7 @@
 #include <cstdlib>
 #include <cstring>
 #include <climits>
+#include <algorithm>
 
 // Static variable definitions.
 const unsigned int RtApi::MAX_SAMPLE_RATES = 14;

src/AppFrame.cpp

@@ -34,7 +34,7 @@ EVT_IDLE(AppFrame::OnIdle)
 wxEND_EVENT_TABLE()
 
 AppFrame::AppFrame() :
-        wxFrame(NULL, wxID_ANY, wxT(CUBICSDR_TITLE)), activeDemodulator(NULL) {
+        wxFrame(NULL, wxID_ANY, CUBICSDR_TITLE), activeDemodulator(NULL) {
 
     wxBoxSizer *vbox = new wxBoxSizer(wxVERTICAL);
     wxBoxSizer *demodOpts = new wxBoxSizer(wxVERTICAL);
@@ -280,7 +280,7 @@ void AppFrame::OnMenu(wxCommandEvent& event) {
         wxGetApp().getDemodMgr().terminateAll();
         wxGetApp().setFrequency(DEFAULT_FREQ);
         wxGetApp().setOffset(0);
-        SetTitle(wxT(CUBICSDR_TITLE));
+        SetTitle(CUBICSDR_TITLE);
         currentSessionFile = "";
     } else if (event.GetId() == wxID_EXIT) {
         Close(false);

src/demod/DemodulatorThread.cpp

@@ -56,7 +56,7 @@ void DemodulatorThread::threadMain() {
     }
 
     unsigned int h_len = estimate_req_filter_len(ft, As);
-    float h[h_len];
+	float *h = new float[h_len];
     liquid_firdes_kaiser(h_len, firStereoCutoff, As, mu, h);
 
     firStereoLeft = firfilt_rrrf_create(h, h_len);
@@ -81,7 +81,7 @@ void DemodulatorThread::threadMain() {
     float ssbAs = 120.0f;         // stop-band attenuation [dB]
 
     h_len = estimate_req_filter_len(ssbFt, ssbAs);
-    float ssb_h[h_len];
+    float *ssb_h=new float[h_len];
     liquid_firdes_kaiser(h_len, 0.25, ssbAs, 0.0, ssb_h);
 
     firfilt_crcf firSSB = firfilt_crcf_create(ssb_h, h_len);

src/sdr/SDRPostThread.cpp

@@ -88,7 +88,7 @@ void SDRPostThread::threadMain() {
 
             iirfilt_crcf_execute_block(dcFilter, &fpData[0], dataSize, &dataOut[0]);
 
-            if (iqDataOutQueue != NULL) {
+            if (iqDataOutQueue.load() != NULL) {
                 DemodulatorThreadIQData *pipeDataOut = new DemodulatorThreadIQData;
 
                 pipeDataOut->frequency = data_in->frequency;
@@ -97,7 +97,7 @@ void SDRPostThread::threadMain() {
                 iqDataOutQueue.load()->push(pipeDataOut);
             }
 
-            if (iqVisualQueue != NULL && iqVisualQueue.load()->empty()) {
+            if (iqVisualQueue.load() != NULL && iqVisualQueue.load()->empty()) {
                 if (visualDataOut->data.size() < num_vis_samples) {
                     if (visualDataOut->data.capacity() < num_vis_samples) {
                         visualDataOut->data.reserve(num_vis_samples);

src/sdr/SDRThread.cpp

@@ -262,7 +262,7 @@ void SDRThread::threadMain() {
         double time_slice = (double) n_read / (double) sampleRate;
         seconds += time_slice;
 
-        if (iqDataOutQueue != NULL) {
+        if (iqDataOutQueue.load() != NULL) {
             iqDataOutQueue.load()->push(dataOut);
         }
     }