220Hz tone injection option for easier audio quality checks

interface/src/Audio.cpp

@@ -66,8 +66,10 @@ Audio::Audio(Oscilloscope* scope, int16_t initialJitterBufferSamples, QObject* p
     _noiseGateSampleCounter(0),
     _noiseGateOpen(false),
     _noiseGateEnabled(true),
+    _toneInjectionEnabled(false),
     _noiseGateFramesToClose(0),
     _totalPacketsReceived(0),
+    _totalInputAudioSamples(0),
     _collisionSoundMagnitude(0.0f),
     _collisionSoundFrequency(0.0f),
     _collisionSoundNoise(0.0f),
@@ -421,8 +423,10 @@ void Audio::handleAudioInput() {
             const float DC_OFFSET_AVERAGING = 0.99f;
             const float CLIPPING_THRESHOLD = 0.90f;
             
+            //
+            //  Check clipping, adjust DC offset, and check if should open noise gate
+            //
             float measuredDcOffset = 0.f;
-            
             //  Increment the time since the last clip
             if (_timeSinceLastClip >= 0.0f) {
                 _timeSinceLastClip += (float) NETWORK_BUFFER_LENGTH_SAMPLES_PER_CHANNEL / (float) SAMPLE_RATE;
@@ -489,6 +493,16 @@ void Audio::handleAudioInput() {
                     _lastInputLoudness = 0;
                 }
             }
+            //
+            //  Add tone injection if enabled
+            //
+            const float TONE_FREQ = 220.f / SAMPLE_RATE * TWO_PI;
+            const float QUARTER_VOLUME = 8192.f;
+            if (_toneInjectionEnabled) {
+                for (int i = 0; i < NETWORK_BUFFER_LENGTH_SAMPLES_PER_CHANNEL; i++) {
+                    monoAudioSamples[i] = QUARTER_VOLUME * sinf(TONE_FREQ * (float)(i + _proceduralEffectSample));
+                }
+            }
 
             // add input data just written to the scope
             QMetaObject::invokeMethod(_scope, "addSamples", Qt::QueuedConnection,
@@ -683,7 +697,9 @@ void Audio::toggleAudioNoiseReduction() {
     _noiseGateEnabled = !_noiseGateEnabled;
 }
 
-
+void Audio::toggleToneInjection() {
+    _toneInjectionEnabled = !_toneInjectionEnabled;
+}
 
 //  Take a pointer to the acquired microphone input samples and add procedural sounds
 void Audio::addProceduralSounds(int16_t* monoInput, int numSamples) {

interface/src/Audio.h

@@ -81,6 +81,7 @@ public slots:
     void reset();
     void toggleMute();
     void toggleAudioNoiseReduction();
+    void toggleToneInjection();
     
     virtual void handleAudioByteArray(const QByteArray& audioByteArray);
 
@@ -135,8 +136,10 @@ private:
     int _noiseGateSampleCounter;
     bool _noiseGateOpen;
     bool _noiseGateEnabled;
+    bool _toneInjectionEnabled;
     int _noiseGateFramesToClose;
     int _totalPacketsReceived;
+    int _totalInputAudioSamples;
     
     float _collisionSoundMagnitude;
     float _collisionSoundFrequency;

interface/src/Menu.cpp

@@ -360,6 +360,12 @@ Menu::Menu() :
                                            false,
                                            appInstance->getAudio(),
                                            SLOT(toggleMute()));
+    addCheckableActionToQMenuAndActionHash(audioDebugMenu, MenuOption::AudioToneInjection,
+                                           0,
+                                           false,
+                                           appInstance->getAudio(),
+                                           SLOT(toggleToneInjection()));
+
     
     addActionToQMenuAndActionHash(developerMenu, MenuOption::PasteToVoxel,
                 Qt::CTRL | Qt::SHIFT | Qt::Key_V,

interface/src/Menu.h

@@ -242,6 +242,7 @@ namespace MenuOption {
     const QString FilterSixense = "Smooth Sixense Movement";
     const QString Enable3DTVMode = "Enable 3DTV Mode";
     const QString AudioNoiseReduction = "Audio Noise Reduction";
+    const QString AudioToneInjection = "Inject Test Tone";
     const QString EchoServerAudio = "Echo Server Audio";
     const QString EchoLocalAudio = "Echo Local Audio";
     const QString MuteAudio = "Mute Microphone";