AM demod: improved baseband thread management

plugins/channelrx/demodam/amdemod.cpp

@@ -50,9 +50,8 @@ AMDemod::AMDemod(DeviceAPI *deviceAPI) :
 {
     setObjectName(m_channelId);
 
-    m_thread = new QThread(this);
     m_basebandSink = new AMDemodBaseband();
-    m_basebandSink->moveToThread(m_thread);
+    m_basebandSink->moveToThread(&m_thread);
 
 	applySettings(m_settings, true);
 
@@ -69,8 +68,12 @@ AMDemod::~AMDemod()
     delete m_networkManager;
 	m_deviceAPI->removeChannelSinkAPI(this);
     m_deviceAPI->removeChannelSink(this);
+
+    if (m_basebandSink->isRunning()) {
+        stop();
+    }
+
     delete m_basebandSink;
-    delete m_thread;
 }
 
 uint32_t AMDemod::getNumberOfDeviceStreams() const
@@ -88,19 +91,23 @@ void AMDemod::start()
 {
 	qDebug("AMDemod::start");
 
-    if (m_basebandSampleRate != 0) {
-        m_basebandSink->setBasebandSampleRate(m_basebandSampleRate);
-    }
-
     m_basebandSink->reset();
-    m_thread->start();
+    m_basebandSink->startWork();
+    m_thread.start();
+
+    DSPSignalNotification *dspMsg = new DSPSignalNotification(m_basebandSampleRate, m_centerFrequency);
+    m_basebandSink->getInputMessageQueue()->push(dspMsg);
+
+    AMDemodBaseband::MsgConfigureAMDemodBaseband *msg = AMDemodBaseband::MsgConfigureAMDemodBaseband::create(m_settings, true);
+    m_basebandSink->getInputMessageQueue()->push(msg);
 }
 
 void AMDemod::stop()
 {
     qDebug("AMDemod::stop");
-	m_thread->exit();
-	m_thread->wait();
+	m_basebandSink->stopWork();
+	m_thread.quit();
+	m_thread.wait();
 }
 
 bool AMDemod::handleMessage(const Message& cmd)
@@ -117,6 +124,7 @@ bool AMDemod::handleMessage(const Message& cmd)
     {
         DSPSignalNotification& notif = (DSPSignalNotification&) cmd;
         m_basebandSampleRate = notif.getSampleRate();
+        m_centerFrequency = notif.getCenterFrequency();
         // Forward to the sink
         DSPSignalNotification* rep = new DSPSignalNotification(notif); // make a copy
         qDebug() << "AMDemod::handleMessage: DSPSignalNotification";

plugins/channelrx/demodam/amdemod.h

@@ -21,6 +21,7 @@
 #include <vector>
 
 #include <QNetworkRequest>
+#include <QThread>
 
 #include "dsp/basebandsamplesink.h"
 #include "channel/channelapi.h"
@@ -126,10 +127,11 @@ public:
 
 private:
 	DeviceAPI *m_deviceAPI;
-    QThread *m_thread;
+    QThread m_thread;
     AMDemodBaseband* m_basebandSink;
     AMDemodSettings m_settings;
     int m_basebandSampleRate; //!< stored from device message used when starting baseband sink
+    qint64 m_centerFrequency;
 
     static const int m_udpBlockSize;
 

plugins/channelrx/demodam/amdemodbaseband.cpp

@@ -26,6 +26,7 @@
 MESSAGE_CLASS_DEFINITION(AMDemodBaseband::MsgConfigureAMDemodBaseband, Message)
 
 AMDemodBaseband::AMDemodBaseband() :
+    m_running(false),
     m_mutex(QMutex::Recursive)
 {
     qDebug("AMDemodBaseband::AMDemodBaseband");
@@ -33,22 +34,13 @@ AMDemodBaseband::AMDemodBaseband() :
     m_sampleFifo.setSize(SampleSinkFifo::getSizePolicy(48000));
     m_channelizer = new DownChannelizer(&m_sink);
 
-    QObject::connect(
-        &m_sampleFifo,
-        &SampleSinkFifo::dataReady,
-        this,
-        &AMDemodBaseband::handleData,
-        Qt::QueuedConnection
-    );
-
     DSPEngine::instance()->getAudioDeviceManager()->addAudioSink(m_sink.getAudioFifo(), getInputMessageQueue());
     m_sink.applyAudioSampleRate(DSPEngine::instance()->getAudioDeviceManager()->getOutputSampleRate());
-
-    connect(&m_inputMessageQueue, SIGNAL(messageEnqueued()), this, SLOT(handleInputMessages()));
 }
 
 AMDemodBaseband::~AMDemodBaseband()
 {
+    m_inputMessageQueue.clear();
     DSPEngine::instance()->getAudioDeviceManager()->removeAudioSink(m_sink.getAudioFifo());
     delete m_channelizer;
 }
@@ -56,9 +48,37 @@ AMDemodBaseband::~AMDemodBaseband()
 void AMDemodBaseband::reset()
 {
     QMutexLocker mutexLocker(&m_mutex);
+    m_inputMessageQueue.clear();
     m_sampleFifo.reset();
 }
 
+void AMDemodBaseband::startWork()
+{
+    QMutexLocker mutexLocker(&m_mutex);
+    QObject::connect(
+        &m_sampleFifo,
+        &SampleSinkFifo::dataReady,
+        this,
+        &AMDemodBaseband::handleData,
+        Qt::QueuedConnection
+    );
+    connect(&m_inputMessageQueue, SIGNAL(messageEnqueued()), this, SLOT(handleInputMessages()));
+    m_running = true;
+}
+
+void AMDemodBaseband::stopWork()
+{
+    QMutexLocker mutexLocker(&m_mutex);
+    disconnect(&m_inputMessageQueue, SIGNAL(messageEnqueued()), this, SLOT(handleInputMessages()));
+    QObject::disconnect(
+        &m_sampleFifo,
+        &SampleSinkFifo::dataReady,
+        this,
+        &AMDemodBaseband::handleData
+    );
+    m_running = false;
+}
+
 void AMDemodBaseband::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end)
 {
     m_sampleFifo.write(begin, end);

plugins/channelrx/demodam/amdemodbaseband.h

@@ -59,6 +59,8 @@ public:
     AMDemodBaseband();
     ~AMDemodBaseband();
     void reset();
+    void startWork();
+    void stopWork();
     void feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end);
     MessageQueue *getInputMessageQueue() { return &m_inputMessageQueue; } //!< Get the queue for asynchronous inbound communication
     int getChannelSampleRate() const;
@@ -69,6 +71,7 @@ public:
     double getMagSq() const { return m_sink.getMagSq(); }
     bool getPllLocked() const { return m_sink.getPllLocked(); }
     Real getPllFrequency() const { return m_sink.getPllFrequency(); }
+    bool isRunning() const { return m_running; }
 
 private:
     SampleSinkFifo m_sampleFifo;
@@ -76,6 +79,7 @@ private:
     AMDemodSink m_sink;
 	MessageQueue m_inputMessageQueue; //!< Queue for asynchronous inbound communication
     AMDemodSettings m_settings;
+    bool m_running;
     QMutex m_mutex;
 
     bool handleMessage(const Message& cmd);