Move DC correction to channel 0, reduce demod vis CPU usage

- Demod vis now uses channelizer output instead of decimation
- DC correction now only applied to channel 0

src/AppFrame.cpp

@@ -671,8 +671,6 @@ void AppFrame::OnIdle(wxIdleEvent& event) {
     DemodulatorInstance *demod = wxGetApp().getDemodMgr().getLastActiveDemodulator();
 
     if (demod) {
-        DemodulatorInstance *demod = wxGetApp().getDemodMgr().getLastActiveDemodulator();
-
         if (demod->isTracking()) {
             if (spectrumCanvas->getViewState()) {
                 long long diff = abs(demod->getFrequency() - spectrumCanvas->getCenterFrequency()) + (demod->getBandwidth()/2) + (demod->getBandwidth()/4);
@@ -816,7 +814,7 @@ void AppFrame::OnIdle(wxIdleEvent& event) {
     wxGetApp().getAudioVisualQueue()->set_max_num_items((scopeCanvas->scopeVisible()?1:0) + (scopeCanvas->spectrumVisible()?1:0));
     
     wxGetApp().getScopeProcessor()->run();
-    wxGetApp().getSpectrumDistributor()->run();
+//    wxGetApp().getSpectrumDistributor()->run();
 
     SpectrumVisualProcessor *proc = wxGetApp().getSpectrumProcessor();
     

src/CubicSDR.cpp

@@ -59,22 +59,14 @@ bool CubicSDR::OnInit() {
     pipeIQVisualData = new DemodulatorThreadInputQueue();
     pipeIQVisualData->set_max_num_items(1);
 
-    spectrumDistributor.setInput(pipeIQVisualData);
-    
     pipeDemodIQVisualData = new DemodulatorThreadInputQueue();
     pipeDemodIQVisualData->set_max_num_items(1);
     
-    pipeSpectrumIQVisualData = new DemodulatorThreadInputQueue();
-    pipeSpectrumIQVisualData->set_max_num_items(1);
-    
     pipeWaterfallIQVisualData = new DemodulatorThreadInputQueue();
     pipeWaterfallIQVisualData->set_max_num_items(128);
     
-    spectrumDistributor.attachOutput(pipeDemodIQVisualData);
-    spectrumDistributor.attachOutput(pipeSpectrumIQVisualData);
-    
     getDemodSpectrumProcessor()->setInput(pipeDemodIQVisualData);
-    getSpectrumProcessor()->setInput(pipeSpectrumIQVisualData);
+    getSpectrumProcessor()->setInput(pipeIQVisualData);
     
     pipeAudioVisualData = new DemodulatorThreadOutputQueue();
     pipeAudioVisualData->set_max_num_items(1);
@@ -89,19 +81,17 @@ bool CubicSDR::OnInit() {
     sdrThread->setOutputQueue("IQDataOutput",pipeSDRIQData);
 
     sdrPostThread = new SDRPostThread();
-//    sdrPostThread->setNumVisSamples(BUF_SIZE);
     sdrPostThread->setInputQueue("IQDataInput", pipeSDRIQData);
     sdrPostThread->setOutputQueue("IQVisualDataOutput", pipeIQVisualData);
     sdrPostThread->setOutputQueue("IQDataOutput", pipeWaterfallIQVisualData);
+    sdrPostThread->setOutputQueue("IQActiveDemodVisualDataOutput", pipeDemodIQVisualData);
     
     t_PostSDR = new std::thread(&SDRPostThread::threadMain, sdrPostThread);
     t_SpectrumVisual = new std::thread(&SpectrumVisualDataThread::threadMain, spectrumVisualThread);
     t_DemodVisual = new std::thread(&SpectrumVisualDataThread::threadMain, demodVisualThread);
 
-//    t_SDR = new std::thread(&SDRThread::threadMain, sdrThread);
     sdrEnum = new SDREnumerator();
 
-
     appframe = new AppFrame();
 	t_SDREnum = new std::thread(&SDREnumerator::threadMain, sdrEnum);
 
@@ -371,11 +361,6 @@ SpectrumVisualProcessor *CubicSDR::getDemodSpectrumProcessor() {
     return demodVisualThread->getProcessor();
 }
 
-VisualDataDistributor<DemodulatorThreadIQData> *CubicSDR::getSpectrumDistributor() {
-    return &spectrumDistributor;
-}
-
-
 DemodulatorThreadOutputQueue* CubicSDR::getAudioVisualQueue() {
     return pipeAudioVisualData;
 }

src/CubicSDR.h

@@ -70,11 +70,11 @@ public:
     ScopeVisualProcessor *getScopeProcessor();
     SpectrumVisualProcessor *getSpectrumProcessor();
     SpectrumVisualProcessor *getDemodSpectrumProcessor();
-    VisualDataDistributor<DemodulatorThreadIQData> *getSpectrumDistributor();
     
     DemodulatorThreadOutputQueue* getAudioVisualQueue();
     DemodulatorThreadInputQueue* getIQVisualQueue();
     DemodulatorThreadInputQueue* getWaterfallVisualQueue();
+    DemodulatorThreadInputQueue* getActiveDemodVisualQueue();
     DemodulatorMgr &getDemodMgr();
 
     void bindDemodulator(DemodulatorInstance *demod);
@@ -122,18 +122,15 @@ private:
     SpectrumVisualDataThread *spectrumVisualThread;
     SpectrumVisualDataThread *demodVisualThread;
 
-//    SDRThreadCommandQueue* pipeSDRCommand;
     SDRThreadIQDataQueue* pipeSDRIQData;
     DemodulatorThreadInputQueue* pipeIQVisualData;
     DemodulatorThreadOutputQueue* pipeAudioVisualData;
     DemodulatorThreadInputQueue* pipeDemodIQVisualData;
-    DemodulatorThreadInputQueue* pipeSpectrumIQVisualData;
     DemodulatorThreadInputQueue* pipeWaterfallIQVisualData;
+    DemodulatorThreadInputQueue* pipeActiveDemodIQVisualData;
 
     ScopeVisualProcessor scopeProcessor;
     
-    VisualDataDistributor<DemodulatorThreadIQData> spectrumDistributor;
-
     SDRDevicesDialog *deviceSelectorDialog;
 
     std::thread *t_SDR, *t_SDREnum, *t_PostSDR, *t_SpectrumVisual, *t_DemodVisual;

src/sdr/SDRPostThread.cpp

@@ -18,6 +18,7 @@ SDRPostThread::SDRPostThread() : IOThread() {
     nRunDemods = 0;
     
     doRefresh.store(false);
+    dcFilter = iirfilt_crcf_create_dc_blocker(0.0005);
 }
 
 SDRPostThread::~SDRPostThread() {
@@ -65,9 +66,7 @@ void SDRPostThread::initPFBChannelizer() {
     chanCenters.resize(numChannels);
     demodChannelActive.resize(numChannels);
     
-    // firpfbch2 returns 2x sample rate per channel
+//    std::cout << "Channel bandwidth spacing: " << (chanBw) << std::endl;
-    // so, max demodulation without gaps is 1/2 chanBw ..?
-//    std::cout << "Channel bandwidth spacing: " << (chanBw/2) << " actual bandwidth: " << chanBw << std::endl;
 }
 
 void SDRPostThread::updateActiveDemodulators() {
@@ -141,9 +140,12 @@ void SDRPostThread::run() {
     iqDataInQueue = (SDRThreadIQDataQueue*)getInputQueue("IQDataInput");
     iqDataOutQueue = (DemodulatorThreadInputQueue*)getOutputQueue("IQDataOutput");
     iqVisualQueue = (DemodulatorThreadInputQueue*)getOutputQueue("IQVisualDataOutput");
+    iqActiveDemodVisualQueue = (DemodulatorThreadInputQueue*)getOutputQueue("IQActiveDemodVisualDataOutput");
 
     iqDataInQueue->set_max_num_items(0);
 
+    std::vector<liquid_float_complex> dcBuf;
+    
     while (!terminated) {
         SDRThreadIQData *data_in;
         
@@ -178,23 +180,24 @@ void SDRPostThread::run() {
             //                }
             //            }
             
-            if (iqVisualQueue != NULL || iqDataOutQueue != NULL) {
+            if (iqDataOutQueue != NULL && !iqDataOutQueue->full()) {
-                bool doIQVis = iqVisualQueue && !iqVisualQueue->full();
-                bool doIQOut = iqDataOutQueue != NULL;
-                
                 DemodulatorThreadIQData *iqDataOut = visualDataBuffers.getBuffer();
-                iqDataOut->setRefCount((doIQVis?1:0) + (doIQOut?1:0));
+                
+                bool doVis = false;
+                
+                if (iqVisualQueue != NULL && !iqVisualQueue->full()) {
+                    doVis = true;
+                }
+                
+                iqDataOut->setRefCount(1 + (doVis?1:0));
                 
                 iqDataOut->frequency = data_in->frequency;
                 iqDataOut->sampleRate = data_in->sampleRate;
                 iqDataOut->data.assign(data_in->data.begin(), data_in->data.begin() + dataSize);
 
-                if (doIQVis) {
-                    iqVisualQueue->push(iqDataOut);
-                }
-                
-                if (doIQOut) {
                 iqDataOutQueue->push(iqDataOut);
+                if (doVis) {
+                    iqVisualQueue->push(iqDataOut);
                 }
             }
 
@@ -211,6 +214,8 @@ void SDRPostThread::run() {
                 doRefresh.store(false);
             }
 
+            DemodulatorInstance *activeDemod = wxGetApp().getDemodMgr().getLastActiveDemodulator();
+            int activeDemodChannel = -1;
             
             // Find active demodulators
             if (nRunDemods) {
@@ -220,7 +225,7 @@ void SDRPostThread::run() {
 //                }
                 
                 // channelize data
-                // firpfbch2 output rate is 2 x ( input rate / channels )
+                // firpfbch output rate is (input rate / channels)
                 for (int i = 0, iMax = dataSize; i < iMax; i+=numChannels) {
                     firpfbch_crcf_analyzer_execute(channelizer, &data_in->data[i], &dataOut[i]);
                 }
@@ -239,6 +244,9 @@ void SDRPostThread::run() {
                         if (fdelta < minDelta) {
                             minDelta = fdelta;
                             demodChannel[i] = j;
+                            if (demod == activeDemod) {
+                                activeDemodChannel = j;
+                            }
                         }
                     }
                 }
@@ -250,16 +258,12 @@ void SDRPostThread::run() {
                     }
                 }
                 
-                
                 // Run channels
                 for (int i = 0; i < numChannels; i++) {
-                    if (demodChannelActive[i] == 0) {
+                    bool doVis = (activeDemodChannel == i) && (iqActiveDemodVisualQueue != NULL) && !iqActiveDemodVisualQueue->full();
-                        // Nothing using this channel, skip
-                        continue;
-                    }
                     
                     DemodulatorThreadIQData *demodDataOut = buffers.getBuffer();
-                    demodDataOut->setRefCount(demodChannelActive[i]);
+                    demodDataOut->setRefCount(demodChannelActive[i] + (doVis?1:0));
                     demodDataOut->frequency = chanCenters[i];
                     demodDataOut->sampleRate = chanBw;
 
@@ -274,10 +278,25 @@ void SDRPostThread::run() {
                     }
 
                     // prepare channel data buffer
+                    if (i == 0) {   // Channel 0 requires DC correction
+                        if (dcBuf.size() != chanDataSize) {
+                            dcBuf.resize(chanDataSize);
+                        }
+                        for (int j = 0, idx = i; j < chanDataSize; j++) {
+                            idx += numChannels;
+                            dcBuf[j] = dataOut[idx];
+                        }
+                        iirfilt_crcf_execute_block(dcFilter, &dcBuf[0], chanDataSize, &demodDataOut->data[0]);
+                    } else {
                         for (int j = 0, idx = i; j < chanDataSize; j++) {
                             idx += numChannels;
                             demodDataOut->data[j] = dataOut[idx];
                         }
+                    }
+
+                    if (doVis) {
+                        iqActiveDemodVisualQueue->push(demodDataOut);
+                    }
                     
                     for (int j = 0; j < nRunDemods; j++) {
                         if (demodChannel[j] == i) {

src/sdr/SDRPostThread.h

@@ -25,6 +25,7 @@ protected:
     SDRThreadIQDataQueue *iqDataInQueue;
     DemodulatorThreadInputQueue *iqDataOutQueue;
     DemodulatorThreadInputQueue *iqVisualQueue;
+    DemodulatorThreadInputQueue *iqActiveDemodVisualQueue;
     
     std::mutex busy_demod;
     std::vector<DemodulatorInstance *> demodulators;
@@ -51,4 +52,5 @@ private:
     int numChannels, sampleRate;
     long long frequency;
     firpfbch_crcf channelizer;
+    iirfilt_crcf dcFilter;
 };

src/sdr/SoapySDRThread.cpp

@@ -30,7 +30,7 @@ SDRThread::SDRThread() : IOThread() {
     hasHardwareDC.store(false);
     numChannels.store(8);
 
-    dcFilter = iirfilt_crcf_create_dc_blocker(0.0005);
+//    dcFilter = iirfilt_crcf_create_dc_blocker(0.0005);
 }
 
 SDRThread::~SDRThread() {
@@ -80,7 +80,7 @@ void SDRThread::init() {
     }
     if (chan->hasHardwareDC()) {
         hasHardwareDC.store(true);
-        wxGetApp().sdrEnumThreadNotify(SDREnumerator::SDR_ENUM_MESSAGE, std::string("Found hardware DC offset correction support, internal disabled."));
+//        wxGetApp().sdrEnumThreadNotify(SDREnumerator::SDR_ENUM_MESSAGE, std::string("Found hardware DC offset correction support, internal disabled."));
         device->setDCOffsetMode(SOAPY_SDR_RX, chan->getChannel(), true);
     } else {
         hasHardwareDC.store(false);
@@ -121,14 +121,14 @@ void SDRThread::readStream(SDRThreadIQDataQueue* iqDataOutQueue) {
     if (n_read > 0 && !terminated) {
         SDRThreadIQData *dataOut = buffers.getBuffer();
 
-        if (hasHardwareDC) {
+//        if (hasHardwareDC) {
             dataOut->data.assign(inpBuffer.data.begin(), inpBuffer.data.begin()+n_read);
-        } else {
+//        } else {
-            if (dataOut->data.size() != n_read) {
+//            if (dataOut->data.size() != n_read) {
-                dataOut->data.resize(n_read);
+//                dataOut->data.resize(n_read);
-            }
+//            }
-            iirfilt_crcf_execute_block(dcFilter, &inpBuffer.data[0], n_read, &dataOut->data[0]);
+//            iirfilt_crcf_execute_block(dcFilter, &inpBuffer.data[0], n_read, &dataOut->data[0]);
-        }
+//        }
 
         
         dataOut->setRefCount(1);

src/sdr/SoapySDRThread.h

@@ -77,7 +77,6 @@ protected:
     SoapySDR::Device *device;
     void *buffs[1];
     ReBuffer<SDRThreadIQData> buffers;
-    iirfilt_crcf dcFilter;
     SDRThreadIQData inpBuffer;
     std::atomic<DeviceConfig *> deviceConfig;
     std::atomic<SDRDeviceInfo *> deviceInfo;