Basic mixer for OSX -- multi demod streams working

RtAudio can’t open multiple streams, so now opening a new device will
start a static audio thread and all other threads will attach/detach
their input queues there.

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) {
+        false), preDemodTerminated(false), active(false) {
 
     label = new std::string("Unnamed");
     threadQueueDemod = new DemodulatorThreadInputQueue;
@@ -42,14 +42,12 @@ void DemodulatorInstance::run() {
     pthread_attr_init(&attr);
     pthread_attr_setstacksize(&attr, 2048000);
     pthread_attr_getstacksize(&attr, &size);
-    pthread_attr_setschedpolicy(&attr, SCHED_RR);
     pthread_create(&t_PreDemod, &attr, &DemodulatorPreThread::pthread_helper, demodulatorPreThread);
     pthread_attr_destroy(&attr);
 
     pthread_attr_init(&attr);
     pthread_attr_setstacksize(&attr, 2048000);
     pthread_attr_getstacksize(&attr, &size);
-    pthread_attr_setschedpolicy(&attr, SCHED_RR);
     pthread_create(&t_Demod, &attr, &DemodulatorThread::pthread_helper, demodulatorThread);
     pthread_attr_destroy(&attr);
 
@@ -59,6 +57,7 @@ void DemodulatorInstance::run() {
     t_PreDemod = new std::thread(&DemodulatorPreThread::threadMain, demodulatorPreThread);
     t_Demod = new std::thread(&DemodulatorThread::threadMain, demodulatorThread);
 #endif
+    active = true;
 }
 
 void DemodulatorInstance::updateLabel(int freq) {
@@ -137,3 +136,11 @@ bool DemodulatorInstance::isTerminated() {
     return terminated;
 }
 
+bool DemodulatorInstance::isActive() {
+    return active;
+}
+
+void DemodulatorInstance::setActive(bool state) {
+    active = state;
+    audioThread->setActive(state);
+}

src/demod/DemodulatorInstance.h

@@ -44,7 +44,15 @@ public:
     bool isTerminated();
     void updateLabel(int freq);
 
+    bool isActive();
+    void setActive(bool state);
+
 private:
-    std::atomic<std::string *> label;bool terminated;bool demodTerminated;bool audioTerminated;bool preDemodTerminated;
+    std::atomic<std::string *> label;
+    bool terminated;
+    bool demodTerminated;
+    bool audioTerminated;
+    bool preDemodTerminated;
+    std::atomic<bool> active;
 };
 

src/demod/DemodulatorPreThread.cpp

@@ -88,10 +88,10 @@ void *DemodulatorPreThread::threadMain() {
 void DemodulatorPreThread::threadMain() {
 #endif
 #ifdef __APPLE__
-    pthread_t tID = pthread_self();	 // ID of this thread
-    int priority = sched_get_priority_min( SCHED_RR );
-    sched_param prio = {priority}; // scheduling priority of thread
-    pthread_setschedparam( tID, SCHED_RR, &prio );
+    pthread_t tID = pthread_self();  // ID of this thread
+    int priority = sched_get_priority_max( SCHED_FIFO )-1;
+    sched_param prio = { priority }; // scheduling priority of thread
+    pthread_setschedparam(tID, SCHED_FIFO, &prio);
 #endif
 
     if (!initialized) {

src/demod/DemodulatorThread.cpp

@@ -22,10 +22,10 @@ void *DemodulatorThread::threadMain() {
 void DemodulatorThread::threadMain() {
 #endif
 #ifdef __APPLE__
-    pthread_t tID = pthread_self();	 // ID of this thread
-    int priority = sched_get_priority_min( SCHED_RR );
-    sched_param prio = {priority}; // scheduling priority of thread
-    pthread_setschedparam( tID, SCHED_RR, &prio );
+    pthread_t tID = pthread_self();  // ID of this thread
+    int priority = sched_get_priority_max( SCHED_FIFO )-1;
+    sched_param prio = { priority }; // scheduling priority of thread
+    pthread_setschedparam(tID, SCHED_FIFO, &prio);
 #endif
 
     msresamp_crcf audio_resampler = NULL;
@@ -93,8 +93,11 @@ void DemodulatorThread::threadMain() {
             audioInputQueue->push(ati);
         }
 
-        if (visOutQueue != NULL) {
-            visOutQueue->push(ati);
+        if (visOutQueue != NULL && visOutQueue->empty()) {
+            AudioThreadInput ati_vis;
+            ati_vis.data.assign(demod_output,demod_output+num_written);
+            visOutQueue->push(ati_vis);
+//            visOutQueue->push(ati);
         }
     }