Cleanup, demod limits, prevent negative freq, move iq resampler process back to demodulator pre thread

src/AppFrame.cpp

@@ -57,6 +57,7 @@ AppFrame::AppFrame() :
 
     demodSignalMeter = new MeterCanvas(this, NULL);
     demodSignalMeter->setMax(0.5);
+    demodSignalMeter->setHelpTip("Current Signal Level.  Click / Drag to set Squelch level.");
     demodTray->Add(demodSignalMeter, 1, wxEXPAND | wxALL, 0);
 
     demodTray->AddSpacer(2);

src/CubicSDR.cpp

@@ -101,8 +101,10 @@ PrimaryGLContext& CubicSDR::GetContext(wxGLCanvas *canvas) {
 }
 
 void CubicSDR::setFrequency(unsigned int freq) {
+    if (freq < SRATE/2) {
+        freq = SRATE/2;
+    }
     frequency = freq;
-//    demodulatorTest->getParams().frequency = freq;
     SDRThreadCommand command(SDRThreadCommand::SDR_THREAD_CMD_TUNE);
     command.int_value = freq;
     threadCmdQueueSDR->push(command);

src/demod/DemodDefs.h

@@ -75,14 +75,12 @@ class DemodulatorThreadPostIQData: public ReferenceCounter {
 public:
     std::vector<liquid_float_complex> data;
     int bandwidth;
-    msresamp_crcf resampler;
-    double resamplerRatio;
     msresamp_rrrf audioResampler;
     msresamp_rrrf stereoResampler;
     double audioResampleRatio;
 
     DemodulatorThreadPostIQData() :
-            bandwidth(0), resampler(NULL), resamplerRatio(0), audioResampler(NULL), stereoResampler(NULL), audioResampleRatio(0) {
+            bandwidth(0), audioResampler(NULL), stereoResampler(NULL), audioResampleRatio(0) {
 
     }
 

src/demod/DemodulatorInstance.cpp

@@ -2,7 +2,7 @@
 
 DemodulatorInstance::DemodulatorInstance() :
         t_Demod(NULL), t_PreDemod(NULL), t_Audio(NULL), threadQueueDemod(NULL), demodulatorThread(NULL), terminated(false), audioTerminated(false), demodTerminated(
-        false), preDemodTerminated(false), active(false), squelch(false), stereo(false) {
+        false), preDemodTerminated(false), active(false), squelch(false), stereo(false), currentBandwidth(0), currentFrequency(0) {
 
     label = new std::string("Unnamed");
     threadQueueDemod = new DemodulatorThreadInputQueue;
@@ -157,7 +157,6 @@ void DemodulatorInstance::setStereo(bool state) {
     demodulatorThread->setStereo(state);
 }
 
-
 void DemodulatorInstance::squelchAuto() {
     DemodulatorThreadControlCommand command;
     command.cmd = DemodulatorThreadControlCommand::DEMOD_THREAD_CMD_CTL_SQUELCH_ON;
@@ -191,12 +190,10 @@ void DemodulatorInstance::setSquelchLevel(float signal_level_in) {
     demodulatorThread->setSquelchLevel(signal_level_in);
 }
 
-
 float DemodulatorInstance::getSquelchLevel() {
     return demodulatorThread->getSquelchLevel();
 }
 
-
 void DemodulatorInstance::setOutputDevice(int device_id) {
     if (audioThread) {
         AudioThreadCommand command;
@@ -210,12 +207,19 @@ int DemodulatorInstance::getOutputDevice() {
     return audioThread->getOutputDevice();
 }
 
+void DemodulatorInstance::checkBandwidth() {
+    if ((currentDemodType == DEMOD_TYPE_USB || currentDemodType == DEMOD_TYPE_LSB) && (getBandwidth() > 60000)) {
+        setBandwidth(60000);
+    }
+}
+
 void DemodulatorInstance::setDemodulatorType(int demod_type_in) {
     if (demodulatorThread && threadQueueControl) {
         DemodulatorThreadControlCommand command;
         command.cmd = DemodulatorThreadControlCommand::DEMOD_THREAD_CMD_CTL_TYPE;
         currentDemodType = demod_type_in;
         command.demodType = demod_type_in;
+        checkBandwidth();
         threadQueueControl->push(command);
     }
 }
@@ -224,3 +228,42 @@ int DemodulatorInstance::getDemodulatorType() {
     return currentDemodType;
 }
 
+void DemodulatorInstance::setBandwidth(int bw) {
+    if (demodulatorPreThread && threadQueueCommand) {
+        DemodulatorThreadCommand command;
+        command.cmd = DemodulatorThreadCommand::DEMOD_THREAD_CMD_SET_BANDWIDTH;
+        currentBandwidth = bw;
+        checkBandwidth();
+        command.int_value = currentBandwidth;
+        threadQueueCommand->push(command);
+    }
+    demodulatorPreThread->getParams().bandwidth;
+}
+
+int DemodulatorInstance::getBandwidth() {
+    if (!currentBandwidth) {
+        currentBandwidth = demodulatorPreThread->getParams().bandwidth;
+    }
+    return currentBandwidth;
+}
+
+void DemodulatorInstance::setFrequency(unsigned int freq) {
+    if (((long)freq - getBandwidth()/2) < SRATE/2) {
+        freq = SRATE/2 - getBandwidth()/2;
+    }
+    if (demodulatorPreThread && threadQueueCommand) {
+         DemodulatorThreadCommand command;
+         command.cmd = DemodulatorThreadCommand::DEMOD_THREAD_CMD_SET_FREQUENCY;
+         currentFrequency = freq;
+         command.int_value = freq;
+         threadQueueCommand->push(command);
+     }
+     demodulatorPreThread->getParams().bandwidth;
+}
+
+int DemodulatorInstance::getFrequency() {
+    if (!currentFrequency) {
+        currentFrequency = demodulatorPreThread->getParams().frequency;
+    }
+    return currentFrequency;
+}

src/demod/DemodulatorInstance.h

@@ -66,7 +66,15 @@ public:
     void setDemodulatorType(int demod_type_in);
     int getDemodulatorType();
 
+    void setBandwidth(int bw);
+    int getBandwidth();
+
+    void setFrequency(unsigned int freq);
+    int getFrequency();
 private:
+
+    void checkBandwidth();
+
     std::atomic<std::string *> label; //
     bool terminated; //
     bool demodTerminated; //
@@ -77,5 +85,6 @@ private:
     std::atomic<bool> stereo;
 
     int currentDemodType;
+    int currentBandwidth;
+    int currentFrequency;
   };
-

src/demod/DemodulatorPreThread.cpp

@@ -173,16 +173,24 @@ void DemodulatorPreThread::threadMain() {
                 buffers.push_back(resamp);
             }
 
-            resamp->setRefCount(1);
+            int out_size = ceil((double) (bufSize) * iqResampleRatio) + 512;
-            resamp->data.assign(in_buf, in_buf + bufSize);
 
-//            firfilt_crcf_execute_block(fir_filter, in_buf, bufSize, &((*resamp.data)[0]));
+            if (resampledData.size() != out_size) {
+                if (resampledData.capacity() < out_size) {
+                    resampledData.reserve(out_size);
+                }
+                resampledData.resize(out_size);
+            }
+
+            unsigned int numWritten;
+            msresamp_crcf_execute(iqResampler, in_buf, bufSize, &resampledData[0], &numWritten);
+
+            resamp->setRefCount(1);
+            resamp->data.assign(resampledData.begin(), resampledData.begin() + numWritten);
 
             resamp->audioResampleRatio = audioResampleRatio;
             resamp->audioResampler = audioResampler;
             resamp->stereoResampler = stereoResampler;
-            resamp->resamplerRatio = iqResampleRatio;
-            resamp->resampler = iqResampler;
             resamp->bandwidth = params.bandwidth;
 
             iqOutputQueue->push(resamp);
@@ -197,6 +205,8 @@ void DemodulatorPreThread::threadMain() {
 
                 switch (result.cmd) {
                 case DemodulatorWorkerThreadResult::DEMOD_WORKER_THREAD_RESULT_FILTERS:
+                    msresamp_crcf_destroy(iqResampler);
+
                     iqResampler = result.resampler;
                     audioResampler = result.audioResampler;
                     stereoResampler = result.stereoResampler;

src/demod/DemodulatorPreThread.h

@@ -48,6 +48,7 @@ protected:
 
     msresamp_crcf iqResampler;
     double iqResampleRatio;
+    std::vector<liquid_float_complex> resampledData;
 
     msresamp_rrrf audioResampler;
     msresamp_rrrf stereoResampler;

src/demod/DemodulatorThread.cpp

@@ -35,7 +35,6 @@ void DemodulatorThread::threadMain() {
     pthread_setschedparam(tID, SCHED_FIFO, &prio);
 #endif
 
-    msresamp_crcf resampler = NULL;
     msresamp_rrrf audioResampler = NULL;
     msresamp_rrrf stereoResampler = NULL;
     firfilt_rrrf firStereoLeft = NULL;
@@ -104,15 +103,12 @@ void DemodulatorThread::threadMain() {
             continue;
         }
 
-        if (resampler == NULL) {
+        if (audioResampler == NULL) {
-            resampler = inp->resampler;
             audioResampler = inp->audioResampler;
             stereoResampler = inp->stereoResampler;
-        } else if (resampler != inp->resampler) {
+        } else if (audioResampler != inp->audioResampler) {
-            msresamp_crcf_destroy(resampler);
             msresamp_rrrf_destroy(audioResampler);
             msresamp_rrrf_destroy(stereoResampler);
-            resampler = inp->resampler;
             audioResampler = inp->audioResampler;
             stereoResampler = inp->stereoResampler;
 
@@ -122,34 +118,27 @@ void DemodulatorThread::threadMain() {
             freqdem_reset(demodFM);
         }
 
-        int out_size = ceil((double) (bufSize) * inp->resamplerRatio) + 512;
+        if (agcData.size() != bufSize) {
-
+            if (agcData.capacity() < bufSize) {
-        if (agcData.size() != out_size) {
+                agcData.reserve(bufSize);
-            if (agcData.capacity() < out_size) {
+                agcAMData.reserve(bufSize);
-                agcData.reserve(out_size);
-                agcAMData.reserve(out_size);
-                resampledData.reserve(out_size);
             }
-            agcData.resize(out_size);
+            agcData.resize(bufSize);
-            resampledData.resize(out_size);
+            agcAMData.resize(bufSize);
-            agcAMData.resize(out_size);
         }
 
-        unsigned int numWritten;
-        msresamp_crcf_execute(resampler, &(inp->data[0]), bufSize, &resampledData[0], &numWritten);
-
         double audio_resample_ratio = inp->audioResampleRatio;
 
-        if (demodOutputData.size() != numWritten) {
+        if (demodOutputData.size() != bufSize) {
-            if (demodOutputData.capacity() < numWritten) {
+            if (demodOutputData.capacity() < bufSize) {
-                demodOutputData.reserve(numWritten);
+                demodOutputData.reserve(bufSize);
             }
-            demodOutputData.resize(numWritten);
+            demodOutputData.resize(bufSize);
         }
 
-        int audio_out_size = ceil((double) (numWritten) * audio_resample_ratio) + 512;
+        int audio_out_size = ceil((double) (bufSize) * audio_resample_ratio) + 512;
 
-        agc_crcf_execute_block(iqAutoGain, &resampledData[0], numWritten, &agcData[0]);
+        agc_crcf_execute_block(iqAutoGain, &(inp->data[0]), bufSize, &agcData[0]);
 
         float currentSignalLevel = 0;
 
@@ -160,27 +149,27 @@ void DemodulatorThread::threadMain() {
         }
 
         if (demodulatorType == DEMOD_TYPE_FM) {
-            freqdem_demodulate_block(demodFM, &agcData[0], numWritten, &demodOutputData[0]);
+            freqdem_demodulate_block(demodFM, &agcData[0], bufSize, &demodOutputData[0]);
         } else {
             float p;
             switch (demodulatorType.load()) {
             case DEMOD_TYPE_LSB:
-                for (int i = 0; i < numWritten; i++) { // Reject upper band
+                for (int i = 0; i < bufSize; i++) { // Reject upper band
-                    nco_crcf_mix_up(ssbShifterUp, resampledData[i], &x);
+                    nco_crcf_mix_up(ssbShifterUp, inp->data[i], &x);
                     nco_crcf_step(ssbShifterUp);
                     firfilt_crcf_push(firSSB, x);
                     firfilt_crcf_execute(firSSB, &x);
-                    nco_crcf_mix_down(ssbShifterDown, x, &resampledData[i]);
+                    nco_crcf_mix_down(ssbShifterDown, x, &(inp->data[i]));
                     nco_crcf_step(ssbShifterDown);
                 }
                 break;
             case DEMOD_TYPE_USB:
-                for (int i = 0; i < numWritten; i++) { // Reject lower band
+                for (int i = 0; i < bufSize; i++) { // Reject lower band
-                    nco_crcf_mix_down(ssbShifterDown, resampledData[i], &x);
+                    nco_crcf_mix_down(ssbShifterDown, inp->data[i], &x);
                     nco_crcf_step(ssbShifterDown);
                     firfilt_crcf_push(firSSB, x);
                     firfilt_crcf_execute(firSSB, &x);
-                    nco_crcf_mix_up(ssbShifterUp, x, &resampledData[i]);
+                    nco_crcf_mix_up(ssbShifterUp, x, &(inp->data[i]));
                     nco_crcf_step(ssbShifterUp);
                 }
                 break;
@@ -190,8 +179,8 @@ void DemodulatorThread::threadMain() {
 
             amOutputCeil = 0;
 
-            for (int i = 0; i < numWritten; i++) {
+            for (int i = 0; i < bufSize; i++) {
-                ampmodem_demodulate(demodAM, resampledData[i], &demodOutputData[i]);
+                ampmodem_demodulate(demodAM, inp->data[i], &demodOutputData[i]);
                 if (demodOutputData[i] > amOutputCeil) {
                     amOutputCeil = demodOutputData[i];
                 }
@@ -201,7 +190,7 @@ void DemodulatorThread::threadMain() {
 
             float gain = 0.95 / amOutputCeilMAA;
 
-            for (int i = 0; i < numWritten; i++) {
+            for (int i = 0; i < bufSize; i++) {
                 demodOutputData[i] *= gain;
             }
         }
@@ -214,14 +203,14 @@ void DemodulatorThread::threadMain() {
         }
 
         unsigned int numAudioWritten;
-        msresamp_rrrf_execute(audioResampler, &demodOutputData[0], numWritten, &resampledOutputData[0], &numAudioWritten);
+        msresamp_rrrf_execute(audioResampler, &demodOutputData[0], bufSize, &resampledOutputData[0], &numAudioWritten);
 
         if (stereo) {
-            if (demodStereoData.size() != numWritten) {
+            if (demodStereoData.size() != bufSize) {
-                if (demodStereoData.capacity() < numWritten) {
+                if (demodStereoData.capacity() < bufSize) {
-                    demodStereoData.reserve(numWritten);
+                    demodStereoData.reserve(bufSize);
                 }
-                demodStereoData.resize(numWritten);
+                demodStereoData.resize(bufSize);
             }
 
             double freq = (2.0 * M_PI) * (((double) abs(38000)) / ((double) inp->bandwidth));
@@ -231,7 +220,7 @@ void DemodulatorThread::threadMain() {
                 stereoShiftFrequency = freq;
             }
 
-            for (int i = 0; i < numWritten; i++) {
+            for (int i = 0; i < bufSize; i++) {
                 firhilbf_r2c_execute(firStereoR2C, demodOutputData[i], &x);
                 nco_crcf_mix_down(stereoShifter, x, &y);
                 nco_crcf_step(stereoShifter);
@@ -245,7 +234,7 @@ void DemodulatorThread::threadMain() {
                 resampledStereoData.resize(audio_out_size);
             }
 
-            msresamp_rrrf_execute(stereoResampler, &demodStereoData[0], numWritten, &resampledStereoData[0], &numAudioWritten);
+            msresamp_rrrf_execute(stereoResampler, &demodStereoData[0], bufSize, &resampledStereoData[0], &numAudioWritten);
         }
 
         if (currentSignalLevel > signalLevel) {
@@ -318,15 +307,15 @@ void DemodulatorThread::threadMain() {
                 }
             } else {
                 ati_vis->channels = 1;
-                if (numAudioWritten > numWritten) {
+                if (numAudioWritten > bufSize) {
 
                     if (num_vis > numAudioWritten) {
                         num_vis = numAudioWritten;
                     }
                     ati_vis->data.assign(resampledOutputData.begin(), resampledOutputData.begin() + num_vis);
                 } else {
-                    if (num_vis > numWritten) {
+                    if (num_vis > bufSize) {
-                        num_vis = numWritten;
+                        num_vis = bufSize;
                     }
                     ati_vis->data.assign(demodOutputData.begin(), demodOutputData.begin() + num_vis);
                 }
@@ -379,9 +368,6 @@ void DemodulatorThread::threadMain() {
         inp->decRefCount();
     }
 
-    if (resampler != NULL) {
-        msresamp_crcf_destroy(resampler);
-    }
     if (audioResampler != NULL) {
         msresamp_rrrf_destroy(audioResampler);
     }

src/demod/DemodulatorThread.h

@@ -48,7 +48,6 @@ protected:
     std::deque<AudioThreadInput *> outputBuffers;
     std::deque<AudioThreadInput *>::iterator outputBuffersI;
 
-    std::vector<liquid_float_complex> resampledData;
     std::vector<liquid_float_complex> agcData;
     std::vector<float> agcAMData;
     std::vector<float> demodOutputData;

src/sdr/SDRThread.cpp

@@ -145,9 +145,12 @@ void SDRThread::threadMain() {
 
                 switch (command.cmd) {
                 case SDRThreadCommand::SDR_THREAD_CMD_TUNE:
-                    std::cout << "Set frequency: " << command.int_value << std::endl;
                     freq_changed = true;
                     new_freq = command.int_value;
+                    if (new_freq < SRATE / 2) {
+                        new_freq = SRATE / 2;
+                    }
+                    std::cout << "Set frequency: " << new_freq << std::endl;
                     break;
                 default:
                     break;

src/visual/MeterCanvas.cpp

@@ -25,11 +25,9 @@ EVT_ENTER_WINDOW(MeterCanvas::OnMouseEnterWindow)
 wxEND_EVENT_TABLE()
 
 MeterCanvas::MeterCanvas(wxWindow *parent, int *attribList) :
-        wxGLCanvas(parent, wxID_ANY, attribList, wxDefaultPosition, wxDefaultSize,
+        InteractiveCanvas(parent, attribList), level(0), level_max(1), inputValue(0), userInputValue(0) {
-        wxFULL_REPAINT_ON_RESIZE), parent(parent), level(0), level_max(1), inputValue(0), userInputValue(0), shiftDown(false), altDown(false), ctrlDown(false) {
 
     glContext = new MeterContext(this, &wxGetApp().GetContext(this));
-    mTracker.setTarget(this);
 }
 
 MeterCanvas::~MeterCanvas() {
@@ -50,9 +48,11 @@ void MeterCanvas::setMax(float max_in) {
 bool MeterCanvas::setInputValue(float slider_in) {
     userInputValue = inputValue = slider_in;
 }
+
 bool MeterCanvas::inputChanged() {
     return (inputValue != userInputValue);
 }
+
 float MeterCanvas::getInputValue() {
     inputValue = userInputValue;
     return userInputValue;
@@ -66,8 +66,8 @@ void MeterCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
     glViewport(0, 0, ClientSize.x, ClientSize.y);
 
     glContext->DrawBegin();
-    if (mTracker.mouseInView()) {
+    if (mouseTracker.mouseInView()) {
-        glContext->Draw(0.4, 0.4, 0.4, 0.5, mTracker.getMouseY());
+        glContext->Draw(0.4, 0.4, 0.4, 0.5, mouseTracker.getMouseY());
     }
 
     glContext->Draw(0.1, 0.75, 0.1, 0.5, level / level_max);
@@ -84,48 +84,42 @@ void MeterCanvas::OnIdle(wxIdleEvent &event) {
 }
 
 void MeterCanvas::OnMouseMoved(wxMouseEvent& event) {
-    mTracker.OnMouseMoved(event);
+    InteractiveCanvas::OnMouseMoved(event);
 
-    shiftDown = event.ShiftDown();
+    if (mouseTracker.mouseDown()) {
-    altDown = event.AltDown();
+        userInputValue = mouseTracker.getMouseY() * level_max;
-    ctrlDown = event.ControlDown();
+    } else {
-
+        if (!helpTip.empty()) {
-    if (mTracker.mouseDown()) {
+            setStatusText(helpTip);
-        userInputValue = mTracker.getMouseY()*level_max;
+        }
     }
 }
 
 void MeterCanvas::OnMouseDown(wxMouseEvent& event) {
-    mTracker.OnMouseDown(event);
+    InteractiveCanvas::OnMouseDown(event);
-
+    userInputValue = mouseTracker.getMouseY() * level_max;
-    shiftDown = event.ShiftDown();
+    mouseTracker.setHorizDragLock(true);
-    altDown = event.AltDown();
-    ctrlDown = event.ControlDown();
-
-    userInputValue = mTracker.getMouseY()*level_max;
-    mTracker.setHorizDragLock(true);
 }
 
 void MeterCanvas::OnMouseWheelMoved(wxMouseEvent& event) {
-    mTracker.OnMouseWheelMoved(event);
+    InteractiveCanvas::OnMouseWheelMoved(event);
 }
 
 void MeterCanvas::OnMouseReleased(wxMouseEvent& event) {
-    mTracker.OnMouseReleased(event);
+    InteractiveCanvas::OnMouseReleased(event);
-
+    userInputValue = mouseTracker.getMouseY() * level_max;
-    shiftDown = event.ShiftDown();
-    altDown = event.AltDown();
-    ctrlDown = event.ControlDown();
-
-    userInputValue = mTracker.getMouseY()*level_max;
 }
 
 void MeterCanvas::OnMouseLeftWindow(wxMouseEvent& event) {
-    mTracker.OnMouseLeftWindow(event);
+    InteractiveCanvas::OnMouseLeftWindow(event);
     SetCursor(wxCURSOR_CROSS);
 }
 
 void MeterCanvas::OnMouseEnterWindow(wxMouseEvent& event) {
-    mTracker.OnMouseEnterWindow(event);
+    InteractiveCanvas::mouseTracker.OnMouseEnterWindow(event);
     SetCursor(wxCURSOR_CROSS);
 }
+
+void MeterCanvas::setHelpTip(std::string tip) {
+    helpTip = tip;
+}

src/visual/MeterCanvas.h

@@ -6,16 +6,15 @@
 #include <vector>
 #include <queue>
 
+#include "InteractiveCanvas.h"
 #include "MeterContext.h"
 #include "MouseTracker.h"
 
 #include "fftw3.h"
 #include "Timer.h"
 
-class MeterCanvas: public wxGLCanvas {
+class MeterCanvas: public InteractiveCanvas {
 public:
-    std::vector<float> waveform_points;
-
     MeterCanvas(wxWindow *parent, int *attribList = NULL);
     ~MeterCanvas();
 
@@ -28,6 +27,8 @@ public:
     bool inputChanged();
     float getInputValue();
 
+    void setHelpTip(std::string tip);
+
 private:
     void OnPaint(wxPaintEvent& event);
     void OnIdle(wxIdleEvent &event);
@@ -39,8 +40,6 @@ private:
     void OnMouseEnterWindow(wxMouseEvent& event);
     void OnMouseLeftWindow(wxMouseEvent& event);
 
-    MouseTracker mTracker;
-    wxWindow *parent;
     MeterContext *glContext;
 
     float level;
@@ -49,9 +48,8 @@ private:
     float inputValue;
     float userInputValue;
 
-    bool shiftDown;
+    std::string helpTip;
-    bool altDown;
+    //
-    bool ctrlDown;
 wxDECLARE_EVENT_TABLE();
 };
 

src/visual/PrimaryGLContext.cpp

@@ -107,7 +107,7 @@ void PrimaryGLContext::DrawDemodInfo(DemodulatorInstance *demod, float r, float
         center_freq = wxGetApp().getFrequency();
     }
 
-    float uxPos = (float) (demod->getParams().frequency - (center_freq - srate / 2)) / (float) srate;
+    float uxPos = (float) (demod->getFrequency() - (center_freq - srate / 2)) / (float) srate;
     uxPos = (uxPos - 0.5) * 2.0;
 
     glDisable(GL_TEXTURE_2D);
@@ -116,7 +116,7 @@ void PrimaryGLContext::DrawDemodInfo(DemodulatorInstance *demod, float r, float
     glBlendFunc(GL_SRC_ALPHA, GL_DST_COLOR);
     glColor4f(r, g, b, 0.6);
 
-    float ofs = ((float) demod->getParams().bandwidth) / (float) srate;
+    float ofs = ((float) demod->getBandwidth()) / (float) srate;
 
     glBlendFunc(GL_SRC_ALPHA, GL_DST_COLOR);
     glColor4f(r, g, b, 0.2);
@@ -162,7 +162,7 @@ void PrimaryGLContext::DrawDemod(DemodulatorInstance *demod, float r, float g, f
         center_freq = wxGetApp().getFrequency();
     }
 
-    float uxPos = (float) (demod->getParams().frequency - (center_freq - srate / 2)) / (float) srate;
+    float uxPos = (float) (demod->getFrequency() - (center_freq - srate / 2)) / (float) srate;
 
     glDisable(GL_DEPTH_TEST);
     glDisable(GL_TEXTURE_2D);
@@ -175,7 +175,7 @@ void PrimaryGLContext::DrawDemod(DemodulatorInstance *demod, float r, float g, f
     glVertex3f((uxPos - 0.5) * 2.0, 1.0, 0.0);
     glVertex3f((uxPos - 0.5) * 2.0, -1.0, 0.0);
 
-    float ofs = ((float) demod->getParams().bandwidth) / (float) srate;
+    float ofs = ((float) demod->getBandwidth()) / (float) srate;
 
     glVertex3f((uxPos - 0.5) * 2.0 - ofs, 1.0, 0.0);
     glVertex3f((uxPos - 0.5) * 2.0 - ofs, -1.0, 0.0);
@@ -254,7 +254,7 @@ void PrimaryGLContext::DrawFreqSelector(float uxPos, float r, float g, float b,
     if (!demod) {
         bw = defaultDemodParams.bandwidth;
     } else {
-        bw = demod->getParams().bandwidth;
+        bw = demod->getBandwidth();
     }
 
     glDisable(GL_DEPTH_TEST);

src/visual/SpectrumCanvas.cpp

@@ -179,7 +179,7 @@ void SpectrumCanvas::OnMouseMoved(wxMouseEvent& event) {
         int freqChange = mouseTracker.getDeltaMouseX() * getBandwidth();
 
         if (freqChange != 0) {
-            int freq = wxGetApp().getFrequency();
+            unsigned int freq = wxGetApp().getFrequency();
 
             if (isView) {
                 centerFreq = centerFreq - freqChange;
@@ -187,19 +187,23 @@ void SpectrumCanvas::OnMouseMoved(wxMouseEvent& event) {
                     waterfallCanvas->setCenterFrequency(centerFreq);
                 }
 
-                int bw = (int) bandwidth;
+                long bw = (long) bandwidth;
-                int bwOfs = ((int) centerFreq > freq) ? ((int) bandwidth / 2) : (-(int) bandwidth / 2);
+                long bwOfs = (centerFreq > freq) ? ((long) bandwidth / 2) : (-(long) bandwidth / 2);
-                int freqEdge = ((int) centerFreq + bwOfs);
+                long freqEdge = ((long) centerFreq + bwOfs);
 
-                if (abs(freq - freqEdge) > (SRATE / 2)) {
+                if (abs((long) freq - freqEdge) > (SRATE / 2)) {
-                    freqChange = -(((int) centerFreq > freq) ? (freqEdge - freq - (SRATE / 2)) : (freqEdge - freq + (SRATE / 2)));
+                    freqChange = -((centerFreq > freq) ? (freqEdge - (long)freq - (SRATE / 2)) : (freqEdge - (long)freq + (SRATE / 2)));
                 } else {
                     freqChange = 0;
                 }
             }
 
             if (freqChange) {
+                if ((long)freq - freqChange < SRATE/2) {
+                    freq = SRATE/2;
+                } else {
                     freq -= freqChange;
+                }
                 wxGetApp().setFrequency(freq);
                 setStatusText("Set center frequency: %s", freq);
             }

src/visual/WaterfallCanvas.cpp

@@ -33,7 +33,7 @@ EVT_ENTER_WINDOW(WaterfallCanvas::OnMouseEnterWindow)
 wxEND_EVENT_TABLE()
 
 WaterfallCanvas::WaterfallCanvas(wxWindow *parent, int *attribList) :
-        InteractiveCanvas(parent, attribList), spectrumCanvas(NULL), activeDemodulatorBandwidth(0), activeDemodulatorFrequency(0), dragState(
+        InteractiveCanvas(parent, attribList), spectrumCanvas(NULL), dragState(
                 WF_DRAG_NONE), nextDragState(WF_DRAG_NONE), fft_size(0), waterfall_lines(0), plan(
         NULL), in(NULL), out(NULL), resampler(NULL), resamplerRatio(0), lastInputBandwidth(0), zoom(1), mouseZoom(1) {
 
@@ -228,15 +228,23 @@ void WaterfallCanvas::OnKeyDown(wxKeyEvent& event) {
     case WXK_LEFT:
         freq = wxGetApp().getFrequency();
         if (shiftDown) {
+            if (((long) freq - SRATE * 10) < SRATE / 2) {
+                freq = SRATE / 2;
+            } else {
                 freq -= SRATE * 10;
+            }
             if (isView) {
                 setView(centerFreq - SRATE * 10, getBandwidth());
                 if (spectrumCanvas) {
                     spectrumCanvas->setView(getCenterFrequency(), getBandwidth());
                 }
             }
+        } else {
+            if (((long) freq - SRATE / 2) < SRATE / 2) {
+                freq = SRATE / 2;
             } else {
                 freq -= SRATE / 2;
+            }
             if (isView) {
                 setView(centerFreq - SRATE / 2, getBandwidth());
                 if (spectrumCanvas) {
@@ -539,42 +547,31 @@ void WaterfallCanvas::OnMouseMoved(wxMouseEvent& event) {
                 bwDiff = -bwDiff;
             }
 
-            if (!activeDemodulatorBandwidth) {
+            int currentBW = demod->getBandwidth();
-                activeDemodulatorBandwidth = demod->getParams().bandwidth;
+
+            currentBW = currentBW + bwDiff;
+            if (currentBW > SRATE) {
+                currentBW = SRATE;
+            }
+            if (currentBW < MIN_BANDWIDTH) {
+                currentBW = MIN_BANDWIDTH;
             }
 
-            DemodulatorThreadCommand command;
+            demod->setBandwidth(currentBW);
-            command.cmd = DemodulatorThreadCommand::DEMOD_THREAD_CMD_SET_BANDWIDTH;
+            setStatusText("Set demodulator bandwidth: %s", demod->getBandwidth());
-            activeDemodulatorBandwidth = activeDemodulatorBandwidth + bwDiff;
-            if (activeDemodulatorBandwidth > SRATE) {
-                activeDemodulatorBandwidth = SRATE;
-            }
-            if (activeDemodulatorBandwidth < MIN_BANDWIDTH) {
-                activeDemodulatorBandwidth = MIN_BANDWIDTH;
-            }
-
-            command.int_value = activeDemodulatorBandwidth;
-            demod->getCommandQueue()->push(command);
-            setStatusText("Set demodulator bandwidth: %s", activeDemodulatorBandwidth);
         }
 
         if (dragState == WF_DRAG_FREQUENCY) {
             int bwDiff = (int) (mouseTracker.getDeltaMouseX() * (float) getBandwidth());
 
-            if (!activeDemodulatorFrequency) {
+            unsigned int currentFreq = demod->getFrequency();
-                activeDemodulatorFrequency = demod->getParams().frequency;
-            }
 
-            DemodulatorThreadCommand command;
+            currentFreq = (unsigned int)((int)currentFreq + bwDiff);
-            command.cmd = DemodulatorThreadCommand::DEMOD_THREAD_CMD_SET_FREQUENCY;
-            activeDemodulatorFrequency = activeDemodulatorFrequency + bwDiff;
 
-            command.int_value = activeDemodulatorFrequency;
+            demod->setFrequency(currentFreq);
-            demod->getCommandQueue()->push(command);
+            demod->updateLabel(currentFreq);
 
-            demod->updateLabel(activeDemodulatorFrequency);
+            setStatusText("Set demodulator frequency: %s", demod->getFrequency());
-
-            setStatusText("Set demodulator frequency: %s", activeDemodulatorFrequency);
         }
     } else if (mouseTracker.mouseRightDown()) {
         mouseZoom = mouseZoom + ((1.0 - (mouseTracker.getDeltaMouseY() * 4.0)) - mouseZoom) * 0.1;
@@ -655,7 +652,8 @@ void WaterfallCanvas::OnMouseMoved(wxMouseEvent& event) {
             if (shiftDown) {
                 setStatusText("Click to create a new demodulator or hold ALT to drag range.");
             } else {
-                setStatusText("Click to move active demodulator frequency or hold ALT to drag range; hold SHIFT to create new.  Right drag or A / Z to Zoom.  Arrow keys (+SHIFT) to move center frequency.");
+                setStatusText(
+                        "Click to move active demodulator frequency or hold ALT to drag range; hold SHIFT to create new.  Right drag or A / Z to Zoom.  Arrow keys (+SHIFT) to move center frequency.");
             }
         }
 
@@ -671,9 +669,6 @@ void WaterfallCanvas::OnMouseDown(wxMouseEvent& event) {
     if (dragState && dragState != WF_DRAG_RANGE) {
         wxGetApp().getDemodMgr().setActiveDemodulator(wxGetApp().getDemodMgr().getActiveDemodulator(), false);
     }
-
-    activeDemodulatorBandwidth = 0;
-    activeDemodulatorFrequency = 0;
 }
 
 void WaterfallCanvas::OnMouseWheelMoved(wxMouseEvent& event) {

src/visual/WaterfallCanvas.h

@@ -61,9 +61,6 @@ private:
 
     WaterfallContext *glContext;
 
-    int activeDemodulatorBandwidth;
-    int activeDemodulatorFrequency;
-
     DragState dragState;
     DragState nextDragState;