Adds feature to Swap I/Q

src/AppFrame.cpp

@@ -130,8 +130,24 @@ AppFrame::AppFrame() :
     wxMenuBar *menuBar = new wxMenuBar;
     wxMenu *menu = new wxMenu;
     
-    menu->Append(wxID_SET_FREQ_OFFSET, "Set Frequency Offset");
+    menu->Append(wxID_OPEN, "&Open Session");
-    menu->Append(wxID_SET_PPM, "Set Device PPM");
+    menu->Append(wxID_SAVE, "&Save Session");
+    menu->Append(wxID_SAVEAS, "Save Session &As..");
+    menu->AppendSeparator();
+    menu->Append(wxID_RESET, "&Reset Session");
+            
+#ifndef __APPLE__
+    menu->AppendSeparator();
+    menu->Append(wxID_CLOSE);
+#endif
+            
+    menuBar->Append(menu, wxT("&File"));
+            
+    menu = new wxMenu;
+    
+    menu->Append(wxID_SET_FREQ_OFFSET, "Frequency Offset");
+    menu->Append(wxID_SET_PPM, "Device PPM");
+    iqSwapMenuItem = menu->AppendCheckItem(wxID_SET_SWAP_IQ, "Swap I/Q");
             
     wxMenu *dsMenu = new wxMenu;
     
@@ -141,20 +157,7 @@ AppFrame::AppFrame() :
     
     menu->AppendSubMenu(dsMenu, "Direct Sampling");
 
-    wxMenu *sessionMenu = new wxMenu;
+    menuBar->Append(menu, wxT("&Settings"));
-    sessionMenu->Append(wxID_OPEN, "&Open Session");
-    sessionMenu->Append(wxID_SAVE, "&Save Session");
-    sessionMenu->Append(wxID_SAVEAS, "Save Session &As..");
-    sessionMenu->AppendSeparator();
-    sessionMenu->Append(wxID_RESET, "&Reset Session");
-
-    menu->AppendSubMenu(sessionMenu, "Session");
-            
-    menu->AppendSeparator();
-            
-    menu->Append(wxID_CLOSE);
-
-    menuBar->Append(menu, wxT("&File"));
             
     menu = new wxMenu;
 
@@ -183,7 +186,7 @@ AppFrame::AppFrame() :
         outputDeviceMenuItems[mdevices_i->first] = itm;
     }
 
-    menuBar->Append(menu, wxT("Active Demodulator &Output"));
+    menuBar->Append(menu, wxT("Audio &Output"));
 
     menu = new wxMenu;
 
@@ -340,6 +343,10 @@ void AppFrame::OnMenu(wxCommandEvent& event) {
         wxGetApp().setDirectSampling(1);
     } else if (event.GetId() == wxID_SET_DS_Q) {
         wxGetApp().setDirectSampling(2);
+    } else if (event.GetId() == wxID_SET_SWAP_IQ) {
+        bool swap_state = !wxGetApp().getSwapIQ();
+        wxGetApp().setSwapIQ(swap_state);
+        iqSwapMenuItem->Check(swap_state);
     } else if (event.GetId() == wxID_SET_PPM) {
         long ofs = wxGetNumberFromUser("Frequency correction for device in PPM.\ni.e. -51 for -51 PPM\n\nNote: you can adjust PPM interactively\nby holding ALT over the frequency tuning bar.\n", "Parts per million (PPM)",
                 "Frequency Correction", wxGetApp().getPPM(), -1000, 1000, this);

src/AppFrame.h

@@ -19,6 +19,7 @@
 #define wxID_SET_DS_OFF 2004
 #define wxID_SET_DS_I 2005
 #define wxID_SET_DS_Q 2006
+#define wxID_SET_SWAP_IQ 2007
 
 #define wxID_THEME_DEFAULT 2100
 #define wxID_THEME_SHARP 2101
@@ -78,6 +79,7 @@ private:
     std::map<int, wxMenuItem *> outputDeviceMenuItems;
     std::map<int, wxMenuItem *> sampleRateMenuItems;
     std::map<int, wxMenuItem *> audioSampleRateMenuItems;
+    wxMenuItem *iqSwapMenuItem;
     
     std::string currentSessionFile;
 

src/CubicSDR.cpp

@@ -182,6 +182,14 @@ int CubicSDR::getDirectSampling() {
     return directSamplingMode;
 }
 
+void CubicSDR::setSwapIQ(bool swapIQ) {
+    sdrPostThread->setSwapIQ(swapIQ);
+}
+
+bool CubicSDR::getSwapIQ() {
+    return sdrPostThread->getSwapIQ();
+}
+
 long long CubicSDR::getFrequency() {
     return frequency;
 }

src/CubicSDR.h

@@ -40,6 +40,9 @@ public:
     void setDirectSampling(int mode);
     int getDirectSampling();
 
+    void setSwapIQ(bool swapIQ);
+    bool getSwapIQ();
+
     void setSampleRate(long long rate_in);
     long long getSampleRate();
 

src/sdr/SDRPostThread.cpp

@@ -6,19 +6,21 @@
 #include <deque>
 
 SDRPostThread::SDRPostThread() :
-        iqDataOutQueue(NULL), iqDataInQueue(NULL), iqVisualQueue(NULL), terminated(false), dcFilter(NULL), num_vis_samples(16384*2) {
+        iqDataInQueue(NULL), iqDataOutQueue(NULL), iqVisualQueue(NULL), terminated(false), dcFilter(NULL), num_vis_samples(16384*2), swapIQ(false) {
 
     // create a lookup table
     for (unsigned int i = 0; i <= 0xffff; i++) {
-        liquid_float_complex tmp;
+        liquid_float_complex tmp,tmp_swap;
 # if (__BYTE_ORDER == __LITTLE_ENDIAN)
-        tmp.real = (float(i & 0xff) - 127.4f) * (1.0f/128.0f);
+        tmp_swap.imag = tmp.real = (float(i & 0xff) - 127.4f) * (1.0f/128.0f);
-        tmp.imag = (float(i >> 8) - 127.4f) * (1.0f/128.0f);
+        tmp_swap.real = tmp.imag = (float(i >> 8) - 127.4f) * (1.0f/128.0f);
         _lut.push_back(tmp);
+        _lut_swap.push_back(tmp_swap);
 #else // BIG_ENDIAN
-        tmp.real = (float(i >> 8) - 127.4f) * (1.0f/128.0f);
+        tmp_swap.imag = tmp.real = (float(i >> 8) - 127.4f) * (1.0f/128.0f);
-        tmp.imag = (float(i & 0xff) - 127.4f) * (1.0f/128.0f);
+        tmp_swap.real = tmp.imag = (float(i & 0xff) - 127.4f) * (1.0f/128.0f);
         _lut.push_back(tmp);
+        _lut_swap.push_back(tmp_swap);
 #endif
     }
 }
@@ -64,6 +66,14 @@ int SDRPostThread::getNumVisSamples() {
     return num_vis_samples;
 }
 
+void SDRPostThread::setSwapIQ(bool swapIQ) {
+    this->swapIQ.store(swapIQ);
+}
+
+bool SDRPostThread::getSwapIQ() {
+    return this->swapIQ.load();
+}
+
 void SDRPostThread::threadMain() {
     int n_read;
     double seconds = 0.0;
@@ -103,9 +113,15 @@ void SDRPostThread::threadMain() {
                 dataOut.resize(dataSize);
             }
 
-            for (int i = 0, iMax = dataSize; i < iMax; i++) {
+            if (swapIQ) {
+                for (int i = 0; i < dataSize; i++) {
+                    fpData[i] = _lut_swap[*((uint16_t*)&data_in->data[2*i])];
+                }
+            } else {
+                for (int i = 0; i < dataSize; i++) {
                     fpData[i] = _lut[*((uint16_t*)&data_in->data[2*i])];
                 }
+            }
 
             iirfilt_crcf_execute_block(dcFilter, &fpData[0], dataSize, &dataOut[0]);
 

src/sdr/SDRPostThread.h

@@ -18,6 +18,9 @@ public:
     void setNumVisSamples(int num_vis_samples_in);
     int getNumVisSamples();
     
+    void setSwapIQ(bool swapIQ);
+    bool getSwapIQ();
+    
     void threadMain();
     void terminate();
 
@@ -31,7 +34,9 @@ protected:
     std::atomic<bool> terminated;
     iirfilt_crcf dcFilter;
     int num_vis_samples;
+    std::atomic<bool> swapIQ;
     
 private:
     std::vector<liquid_float_complex> _lut;
+    std::vector<liquid_float_complex> _lut_swap;
 };