Issue #81 patches from @dovandung

src/audio/AudioThread.h

@@ -18,6 +18,7 @@ public:
     int channels;
     float peak;
     std::vector<float> data;
+    std::mutex busy_update;
 
     AudioThreadInput() :
             frequency(0), sampleRate(0), channels(0), peak(0) {

src/demod/DemodDefs.h

@@ -61,6 +61,7 @@ public:
     long long frequency;
     long long sampleRate;
     std::vector<liquid_float_complex> data;
+    std::mutex busy_rw;
 
     DemodulatorThreadIQData() :
             frequency(0), sampleRate(0) {

src/demod/DemodulatorThread.cpp

@@ -310,6 +310,8 @@ void DemodulatorThread::threadMain() {
 
         if (ati && audioVisOutputQueue != NULL && audioVisOutputQueue->empty()) {
 
+            ati_vis->busy_update.lock();
+
             int num_vis = DEMOD_VIS_SIZE;
             if (stereo) {
                 ati_vis->channels = 2;
@@ -342,6 +344,8 @@ void DemodulatorThread::threadMain() {
 //            std::cout << "Signal: " << agc_crcf_get_signal_level(agc) << " -- " << agc_crcf_get_rssi(agc) << "dB " << std::endl;
             }
 
+            ati_vis->busy_update.unlock();
+
             audioVisOutputQueue->push(ati_vis);
         }
         if (!threadQueueControl->empty()) {

src/sdr/SDRPostThread.cpp

@@ -111,6 +111,9 @@ void SDRPostThread::threadMain() {
             }
 
             if (iqVisualQueue.load() != NULL && iqVisualQueue.load()->empty()) {
+
+                visualDataOut->busy_rw.lock();
+
                 if (visualDataOut->data.size() < num_vis_samples) {
                     if (visualDataOut->data.capacity() < num_vis_samples) {
                         visualDataOut->data.reserve(num_vis_samples);
@@ -121,6 +124,9 @@ void SDRPostThread::threadMain() {
                 visualDataOut->frequency = data_in->frequency;
                 visualDataOut->sampleRate = data_in->sampleRate;
                 visualDataOut->data.assign(dataOut.begin(), dataOut.begin() + num_vis_samples);
+
+                visualDataOut->busy_rw.unlock();
+
                 iqVisualQueue.load()->push(visualDataOut);
             }
 

src/visual/ScopeCanvas.cpp

@@ -61,16 +61,21 @@ void ScopeCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
     if (!wxGetApp().getAudioVisualQueue()->empty()) {
         AudioThreadInput *demodAudioData;
         wxGetApp().getAudioVisualQueue()->pop(demodAudioData);
-        if (demodAudioData && demodAudioData->data.size()) {
+        int iMax = demodAudioData->data.size();
-            if (waveform_points.size() != demodAudioData->data.size() * 2) {
+        if (demodAudioData && iMax) {
-                waveform_points.resize(demodAudioData->data.size() * 2);
+            if (waveform_points.size() != iMax * 2) {
+                waveform_points.resize(iMax * 2);
             }
 
-            for (int i = 0, iMax = demodAudioData->data.size(); i < iMax; i++) {
+            demodAudioData->busy_update.lock();
+
+            for (int i = 0; i < iMax; i++) {
                 waveform_points[i * 2 + 1] = demodAudioData->data[i] * 0.5f;
                 waveform_points[i * 2] = ((double) i / (double) iMax);
             }
 
+            demodAudioData->busy_update.unlock();
+
             setStereo(demodAudioData->channels == 2);
         } else {
             std::cout << "Incoming Demodulator data empty?" << std::endl;

src/visual/WaterfallCanvas.cpp

@@ -110,6 +110,8 @@ void WaterfallCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
         DemodulatorThreadIQData *iqData;
         wxGetApp().getIQVisualQueue()->pop(iqData);
 
+        iqData->busy_rw.lock();
+
         if (iqData && iqData->data.size()) {
             setData(iqData);
             if (otherWaterfallCanvas) {
@@ -118,6 +120,8 @@ void WaterfallCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
         } else {
             std::cout << "Incoming IQ data empty?" << std::endl;
         }
+
+        iqData->busy_rw.unlock();
     }
 
     glContext->SetCurrent(*this);