Merge pull request #4056 from huffman/audio-buffer-starvation-detection

Audio buffer starvation detection

interface/src/Audio.cpp

@@ -81,6 +81,12 @@ Audio::Audio() :
     _noiseSourceEnabled(false),
     _toneSourceEnabled(true),
     _outgoingAvatarAudioSequenceNumber(0),
+    _outputBufferSizeFrames(DEFAULT_AUDIO_OUTPUT_BUFFER_SIZE_FRAMES),
+    _outputStarveDetectionStartTimeMsec(0),
+    _outputStarveDetectionCount(0),
+    _outputStarveDetectionEnabled(true),
+    _outputStarveDetectionPeriodMsec(DEFAULT_AUDIO_OUTPUT_STARVE_DETECTION_PERIOD),
+    _outputStarveDetectionThreshold(DEFAULT_AUDIO_OUTPUT_STARVE_DETECTION_THRESHOLD),
     _audioOutputIODevice(_receivedAudioStream, this),
     _stats(&_receivedAudioStream),
     _inputGate()
@@ -947,10 +953,24 @@ bool Audio::switchInputToAudioDevice(const QAudioDeviceInfo& inputDeviceInfo) {
 void Audio::outputNotify() {
     int recentUnfulfilled = _audioOutputIODevice.getRecentUnfulfilledReads();
     if (recentUnfulfilled > 0) {
-        qDebug() << "WARNING --- WE HAD at least:" << recentUnfulfilled << "recently unfulfilled readData() calls";
+        if (_outputStarveDetectionEnabled) {
+            quint64 now = usecTimestampNow() / 1000;
+            quint64 dt = now - _outputStarveDetectionStartTimeMsec;
+            if (dt > _outputStarveDetectionPeriodMsec) {
+                _outputStarveDetectionStartTimeMsec = now;
+                _outputStarveDetectionCount = 0;
+            } else {
+                _outputStarveDetectionCount += recentUnfulfilled;
+                if (_outputStarveDetectionCount > _outputStarveDetectionThreshold) {
+                    int newOutputBufferSizeFrames = _outputBufferSizeFrames + 1;
+                    qDebug() << "Starve detection threshold met, increasing buffer size to " << newOutputBufferSizeFrames;
+                    setOutputBufferSize(newOutputBufferSizeFrames);
 
-        // TODO: Ryan Huffman -- add code here to increase the AUDIO_OUTPUT_BUFFER_SIZE_FRAMES... this code only
-        // runs in cases where the audio device requested data samples, and ran dry because we couldn't fulfill the request
+                    _outputStarveDetectionStartTimeMsec = now;
+                    _outputStarveDetectionCount = 0;
+                }
+            }
+        }
     }
 }
 
@@ -978,13 +998,12 @@ bool Audio::switchOutputToAudioDevice(const QAudioDeviceInfo& outputDeviceInfo)
             
             outputFormatChanged();
 
-            const int AUDIO_OUTPUT_BUFFER_SIZE_FRAMES = 3;
-
             // setup our general output device for audio-mixer audio
             _audioOutput = new QAudioOutput(outputDeviceInfo, _outputFormat, this);
+            _audioOutput->setBufferSize(_outputBufferSizeFrames * _outputFrameSize * sizeof(int16_t));
+
             connect(_audioOutput, &QAudioOutput::notify, this, &Audio::outputNotify);
 
-            _audioOutput->setBufferSize(AUDIO_OUTPUT_BUFFER_SIZE_FRAMES * _outputFrameSize * sizeof(int16_t));
             qDebug() << "Output Buffer capacity in frames: " << _audioOutput->bufferSize() / sizeof(int16_t) / (float)_outputFrameSize;
             
             _audioOutputIODevice.start();
@@ -1002,6 +1021,21 @@ bool Audio::switchOutputToAudioDevice(const QAudioDeviceInfo& outputDeviceInfo)
     return supportedFormat;
 }
 
+void Audio::setOutputBufferSize(int numFrames) {
+    numFrames = std::min(std::max(numFrames, MIN_AUDIO_OUTPUT_BUFFER_SIZE_FRAMES), MAX_AUDIO_OUTPUT_BUFFER_SIZE_FRAMES);
+    if (numFrames != _outputBufferSizeFrames) {
+        qDebug() << "Audio output buffer size (frames): " << numFrames;
+        _outputBufferSizeFrames = numFrames;
+
+        if (_audioOutput) {
+            // The buffer size can't be adjusted after QAudioOutput::start() has been called, so
+            // recreate the device by switching to the default.
+            QAudioDeviceInfo outputDeviceInfo = defaultAudioDeviceForMode(QAudio::AudioOutput);
+            switchOutputToAudioDevice(outputDeviceInfo);
+        }
+    }
+}
+
 // The following constant is operating system dependent due to differences in
 // the way input audio is handled. The audio input buffer size is inversely
 // proportional to the accelerator ratio. 

interface/src/Audio.h

@@ -61,6 +61,13 @@ extern "C" {
 
 static const int NUM_AUDIO_CHANNELS = 2;
 
+static const int DEFAULT_AUDIO_OUTPUT_BUFFER_SIZE_FRAMES = 3;
+static const int MIN_AUDIO_OUTPUT_BUFFER_SIZE_FRAMES = 1;
+static const int MAX_AUDIO_OUTPUT_BUFFER_SIZE_FRAMES = 20;
+static const int DEFAULT_AUDIO_OUTPUT_STARVE_DETECTION_ENABLED = true;
+static const int DEFAULT_AUDIO_OUTPUT_STARVE_DETECTION_THRESHOLD = 3;
+static const int DEFAULT_AUDIO_OUTPUT_STARVE_DETECTION_PERIOD = 10 * 1000; // 10 Seconds
+
 class QAudioInput;
 class QAudioOutput;
 class QIODevice;
@@ -108,7 +115,18 @@ public:
     float getAudioOutputMsecsUnplayed() const;
     
     void setRecorder(RecorderPointer recorder) { _recorder = recorder; }
-    
+
+    int getOutputBufferSize() { return _outputBufferSizeFrames; }
+
+    bool getOutputStarveDetectionEnabled() { return _outputStarveDetectionEnabled; }
+    void setOutputStarveDetectionEnabled(bool enabled) { _outputStarveDetectionEnabled = enabled; }
+
+    int getOutputStarveDetectionPeriod() { return _outputStarveDetectionPeriodMsec; }
+    void setOutputStarveDetectionPeriod(int msecs) { _outputStarveDetectionPeriodMsec = msecs; }
+
+    int getOutputStarveDetectionThreshold() { return _outputStarveDetectionThreshold; }
+    void setOutputStarveDetectionThreshold(int threshold) { _outputStarveDetectionThreshold = threshold; }
+
     static const float CALLBACK_ACCELERATOR_RATIO;
     
 public slots:
@@ -137,6 +155,8 @@ public slots:
     void processReceivedSamples(const QByteArray& inputBuffer, QByteArray& outputBuffer);
     void sendMuteEnvironmentPacket();
 
+    void setOutputBufferSize(int numFrames);
+
     virtual bool outputLocalInjector(bool isStereo, qreal volume, AudioInjector* injector);
 
     bool switchInputToAudioDevice(const QString& inputDeviceName);
@@ -184,6 +204,14 @@ private:
 
     QString _inputAudioDeviceName;
     QString _outputAudioDeviceName;
+
+    int _outputBufferSizeFrames;
+    bool _outputStarveDetectionEnabled;
+    quint64 _outputStarveDetectionStartTimeMsec;
+    int _outputStarveDetectionCount;
+    int _outputStarveDetectionPeriodMsec;
+    int _outputStarveDetectionThreshold; // Maximum number of starves per _outputStarveDetectionPeriod before increasing buffer size
+
     
     StDev _stdev;
     QElapsedTimer _timeSinceLastReceived;

interface/src/Menu.cpp

@@ -41,6 +41,7 @@
 
 #include "Application.h"
 #include "AccountManager.h"
+#include "Audio.h"
 #include "audio/AudioIOStatsRenderer.h"
 #include "audio/AudioScope.h"
 #include "devices/Faceshift.h"
@@ -642,6 +643,13 @@ void Menu::loadSettings(QSettings* settings) {
     _receivedAudioStreamSettings._windowSecondsForDesiredCalcOnTooManyStarves = settings->value("windowSecondsForDesiredCalcOnTooManyStarves", DEFAULT_WINDOW_SECONDS_FOR_DESIRED_CALC_ON_TOO_MANY_STARVES).toInt();
     _receivedAudioStreamSettings._windowSecondsForDesiredReduction = settings->value("windowSecondsForDesiredReduction", DEFAULT_WINDOW_SECONDS_FOR_DESIRED_REDUCTION).toInt();
     _receivedAudioStreamSettings._repetitionWithFade = settings->value("repetitionWithFade", DEFAULT_REPETITION_WITH_FADE).toBool();
+
+    QSharedPointer<Audio> audio = DependencyManager::get<Audio>();
+    audio->setOutputStarveDetectionEnabled(settings->value("audioOutputStarveDetectionEnabled", DEFAULT_AUDIO_OUTPUT_STARVE_DETECTION_ENABLED).toBool());
+    audio->setOutputStarveDetectionThreshold(settings->value("audioOutputStarveDetectionThreshold", DEFAULT_AUDIO_OUTPUT_STARVE_DETECTION_THRESHOLD).toInt());
+    audio->setOutputStarveDetectionPeriod(settings->value("audioOutputStarveDetectionPeriod", DEFAULT_AUDIO_OUTPUT_STARVE_DETECTION_PERIOD).toInt());
+    int bufferSize = settings->value("audioOutputBufferSize", DEFAULT_AUDIO_OUTPUT_BUFFER_SIZE_FRAMES).toInt();
+    QMetaObject::invokeMethod(audio.data(), "setOutputBufferSize", Q_ARG(int, bufferSize));
     
     _fieldOfView = loadSetting(settings, "fieldOfView", DEFAULT_FIELD_OF_VIEW_DEGREES);
     _realWorldFieldOfView = loadSetting(settings, "realWorldFieldOfView", DEFAULT_REAL_WORLD_FIELD_OF_VIEW_DEGREES);
@@ -701,6 +709,12 @@ void Menu::saveSettings(QSettings* settings) {
     settings->setValue("windowSecondsForDesiredReduction", _receivedAudioStreamSettings._windowSecondsForDesiredReduction);
     settings->setValue("repetitionWithFade", _receivedAudioStreamSettings._repetitionWithFade);
 
+    QSharedPointer<Audio> audio = DependencyManager::get<Audio>();
+    settings->setValue("audioOutputStarveDetectionEnabled", audio->getOutputStarveDetectionEnabled());
+    settings->setValue("audioOutputStarveDetectionThreshold", audio->getOutputStarveDetectionThreshold());
+    settings->setValue("audioOutputStarveDetectionPeriod", audio->getOutputStarveDetectionPeriod());
+    settings->setValue("audioOutputBufferSize", audio->getOutputBufferSize());
+
     settings->setValue("fieldOfView", _fieldOfView);
     settings->setValue("faceshiftEyeDeflection", _faceshiftEyeDeflection);
     settings->setValue("faceshiftHostname", _faceshiftHostname);

interface/src/ui/PreferencesDialog.cpp

@@ -12,6 +12,7 @@
 #include <QFileDialog>
 
 #include "Application.h"
+#include "Audio.h"
 #include "MainWindow.h"
 #include "Menu.h"
 #include "ModelsBrowser.h"
@@ -28,6 +29,9 @@ PreferencesDialog::PreferencesDialog() :
     ui.setupUi(this);
     loadPreferences();
 
+    ui.outputBufferSizeSpinner->setMinimum(MIN_AUDIO_OUTPUT_BUFFER_SIZE_FRAMES);
+    ui.outputBufferSizeSpinner->setMaximum(MAX_AUDIO_OUTPUT_BUFFER_SIZE_FRAMES);
+
     connect(ui.buttonBrowseHead, &QPushButton::clicked, this, &PreferencesDialog::openHeadModelBrowser);
     connect(ui.buttonBrowseBody, &QPushButton::clicked, this, &PreferencesDialog::openBodyModelBrowser);
     connect(ui.buttonBrowseLocation, &QPushButton::clicked, this, &PreferencesDialog::openSnapshotLocationBrowser);
@@ -136,6 +140,13 @@ void PreferencesDialog::loadPreferences() {
     ui.windowSecondsForDesiredReductionSpin->setValue(streamSettings._windowSecondsForDesiredReduction);
     ui.repetitionWithFadeCheckBox->setChecked(streamSettings._repetitionWithFade);
 
+    QSharedPointer<Audio> audio = DependencyManager::get<Audio>();
+    ui.outputBufferSizeSpinner->setValue(audio->getOutputBufferSize());
+
+    ui.outputStarveDetectionCheckBox->setChecked(audio->getOutputStarveDetectionEnabled());
+    ui.outputStarveDetectionThresholdSpinner->setValue(audio->getOutputStarveDetectionThreshold());
+    ui.outputStarveDetectionPeriodSpinner->setValue(audio->getOutputStarveDetectionPeriod());
+
     ui.realWorldFieldOfViewSpin->setValue(menuInstance->getRealWorldFieldOfView());
 
     ui.fieldOfViewSpin->setValue(menuInstance->getFieldOfView());
@@ -244,7 +255,14 @@ void PreferencesDialog::savePreferences() {
     streamSettings._repetitionWithFade = ui.repetitionWithFadeCheckBox->isChecked();
 
     Menu::getInstance()->setReceivedAudioStreamSettings(streamSettings);
-    DependencyManager::get<Audio>()->setReceivedAudioStreamSettings(streamSettings);
+
+    QSharedPointer<Audio> audio = DependencyManager::get<Audio>();
+
+    QMetaObject::invokeMethod(audio.data(), "setOutputBufferSize", Q_ARG(int, ui.outputBufferSizeSpinner->value()));
+
+    audio->setOutputStarveDetectionEnabled(ui.outputStarveDetectionCheckBox->isChecked());
+    audio->setOutputStarveDetectionThreshold(ui.outputStarveDetectionThresholdSpinner->value());
+    audio->setOutputStarveDetectionPeriod(ui.outputStarveDetectionPeriodSpinner->value());
 
     Application::getInstance()->resizeGL(glCanvas->width(), glCanvas->height());
 

interface/ui/preferencesDialog.ui

@@ -59,9 +59,9 @@
     <property name="geometry">
      <rect>
       <x>0</x>
-      <y>0</y>
-      <width>500</width>
-      <height>1386</height>
+      <y>-825</y>
+      <width>485</width>
+      <height>1611</height>
      </rect>
     </property>
     <layout class="QVBoxLayout" name="verticalLayout_2">
@@ -1126,6 +1126,185 @@
        </item>
       </layout>
      </item>
+     <item>
+      <layout class="QHBoxLayout" name="horizontalLayout_6">
+       <property name="spacing">
+        <number>0</number>
+       </property>
+       <property name="topMargin">
+        <number>7</number>
+       </property>
+       <property name="rightMargin">
+        <number>0</number>
+       </property>
+       <property name="bottomMargin">
+        <number>7</number>
+       </property>
+       <item>
+        <widget class="QLabel" name="label_5">
+         <property name="font">
+          <font>
+           <family>Arial</family>
+          </font>
+         </property>
+         <property name="text">
+          <string>Faceshift eye detection</string>
+         </property>
+         <property name="indent">
+          <number>0</number>
+         </property>
+         <property name="buddy">
+          <cstring>faceshiftEyeDeflectionSider</cstring>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <spacer name="horizontalSpacer_6">
+         <property name="font">
+          <font>
+           <family>Arial</family>
+          </font>
+         </property>
+         <property name="orientation">
+          <enum>Qt::Horizontal</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>40</width>
+           <height>20</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+       <item>
+        <widget class="QSlider" name="faceshiftEyeDeflectionSider">
+         <property name="sizePolicy">
+          <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+           <horstretch>0</horstretch>
+           <verstretch>0</verstretch>
+          </sizepolicy>
+         </property>
+         <property name="minimumSize">
+          <size>
+           <width>130</width>
+           <height>0</height>
+          </size>
+         </property>
+         <property name="font">
+          <font>
+           <family>Arial</family>
+          </font>
+         </property>
+         <property name="orientation">
+          <enum>Qt::Horizontal</enum>
+         </property>
+        </widget>
+       </item>
+      </layout>
+     </item>
+     <item>
+      <layout class="QHBoxLayout" name="horizontalLayout_999">
+       <property name="spacing">
+        <number>0</number>
+       </property>
+       <property name="topMargin">
+        <number>7</number>
+       </property>
+       <property name="rightMargin">
+        <number>0</number>
+       </property>
+       <property name="bottomMargin">
+        <number>7</number>
+       </property>
+       <item>
+        <widget class="QLabel" name="label_999">
+         <property name="font">
+          <font>
+           <family>Arial</family>
+          </font>
+         </property>
+         <property name="text">
+          <string>Faceshift hostname</string>
+         </property>
+         <property name="indent">
+          <number>0</number>
+         </property>
+         <property name="buddy">
+          <cstring>faceshiftHostnameEdit</cstring>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <spacer name="horizontalSpacer_999">
+         <property name="font">
+          <font>
+           <family>Arial</family>
+          </font>
+         </property>
+         <property name="orientation">
+          <enum>Qt::Horizontal</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>0</width>
+           <height>0</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+       <item>
+        <widget class="QLineEdit" name="faceshiftHostnameEdit">
+         <property name="font">
+          <font>
+           <family>Arial</family>
+          </font>
+         </property>
+         <property name="layoutDirection">
+          <enum>Qt::LeftToRight</enum>
+         </property>
+         <property name="styleSheet">
+          <string notr="true"/>
+         </property>
+         <property name="placeholderText">
+          <string>localhost</string>
+         </property>
+        </widget>
+       </item>
+      </layout>
+     </item>
+     <item>
+      <widget class="QLabel" name="voxelsTitleLabel_2">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Preferred" vsizetype="Minimum">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+       <property name="minimumSize">
+        <size>
+         <width>0</width>
+         <height>40</height>
+        </size>
+       </property>
+       <property name="font">
+        <font>
+         <family>Arial</family>
+         <pointsize>18</pointsize>
+         <weight>75</weight>
+         <bold>true</bold>
+        </font>
+       </property>
+       <property name="styleSheet">
+        <string notr="true">color:#29967e</string>
+       </property>
+       <property name="text">
+        <string>Audio</string>
+       </property>
+       <property name="alignment">
+        <set>Qt::AlignBottom|Qt::AlignLeading|Qt::AlignLeft</set>
+       </property>
+      </widget>
+     </item>
      <item>
       <widget class="QCheckBox" name="dynamicJitterBuffersCheckBox">
        <property name="sizePolicy">
@@ -1651,7 +1830,7 @@
       </widget>
      </item>
      <item>
-      <layout class="QHBoxLayout" name="horizontalLayout_6">
+      <layout class="QHBoxLayout" name="horizontalLayout_23">
        <property name="spacing">
         <number>0</number>
        </property>
@@ -1664,26 +1843,26 @@
        <property name="bottomMargin">
         <number>7</number>
        </property>
-       <item>
-        <widget class="QLabel" name="label_5">
+       <item alignment="Qt::AlignLeft">
+        <widget class="QLabel" name="label_20">
          <property name="font">
           <font>
            <family>Arial</family>
           </font>
          </property>
          <property name="text">
-          <string>Faceshift eye detection</string>
+          <string>Output Buffer Size (Frames)</string>
          </property>
          <property name="indent">
           <number>0</number>
          </property>
          <property name="buddy">
-          <cstring>faceshiftEyeDeflectionSider</cstring>
+          <cstring>windowSecondsForDesiredReductionSpin</cstring>
          </property>
         </widget>
        </item>
        <item>
-        <spacer name="horizontalSpacer_6">
+        <spacer name="horizontalSpacer_25">
          <property name="font">
           <font>
            <family>Arial</family>
@@ -1701,7 +1880,7 @@
         </spacer>
        </item>
        <item>
-        <widget class="QSlider" name="faceshiftEyeDeflectionSider">
+        <widget class="QSpinBox" name="outputBufferSizeSpinner">
          <property name="sizePolicy">
           <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
            <horstretch>0</horstretch>
@@ -1710,24 +1889,72 @@
          </property>
          <property name="minimumSize">
           <size>
-           <width>130</width>
+           <width>100</width>
            <height>0</height>
           </size>
          </property>
+         <property name="maximumSize">
+          <size>
+           <width>70</width>
+           <height>16777215</height>
+          </size>
+         </property>
          <property name="font">
           <font>
            <family>Arial</family>
           </font>
          </property>
-         <property name="orientation">
-          <enum>Qt::Horizontal</enum>
+         <property name="minimum">
+          <number>1</number>
+         </property>
+         <property name="maximum">
+          <number>20</number>
+         </property>
+         <property name="value">
+          <number>1</number>
          </property>
         </widget>
        </item>
       </layout>
      </item>
      <item>
-      <layout class="QHBoxLayout" name="horizontalLayout_999">
+      <widget class="QCheckBox" name="outputStarveDetectionCheckBox">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Minimum" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+       <property name="minimumSize">
+        <size>
+         <width>32</width>
+         <height>40</height>
+        </size>
+       </property>
+       <property name="baseSize">
+        <size>
+         <width>0</width>
+         <height>0</height>
+        </size>
+       </property>
+       <property name="font">
+        <font>
+         <family>Arial</family>
+        </font>
+       </property>
+       <property name="text">
+        <string>Output Starve Detection (Automatic Buffer Size Increase)</string>
+       </property>
+       <property name="iconSize">
+        <size>
+         <width>32</width>
+         <height>32</height>
+        </size>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <layout class="QHBoxLayout" name="horizontalLayout_27">
        <property name="spacing">
         <number>0</number>
        </property>
@@ -1740,26 +1967,26 @@
        <property name="bottomMargin">
         <number>7</number>
        </property>
-       <item>
-        <widget class="QLabel" name="label_999">
+       <item alignment="Qt::AlignLeft">
+        <widget class="QLabel" name="label_24">
          <property name="font">
           <font>
            <family>Arial</family>
           </font>
          </property>
          <property name="text">
-          <string>Faceshift hostname</string>
+          <string>Output Starve Detection Threshold</string>
          </property>
          <property name="indent">
           <number>0</number>
          </property>
          <property name="buddy">
-          <cstring>faceshiftHostnameEdit</cstring>
+          <cstring>windowSecondsForDesiredReductionSpin</cstring>
          </property>
         </widget>
        </item>
        <item>
-        <spacer name="horizontalSpacer_999">
+        <spacer name="horizontalSpacer_29">
          <property name="font">
           <font>
            <family>Arial</family>
@@ -1768,28 +1995,140 @@
          <property name="orientation">
           <enum>Qt::Horizontal</enum>
          </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>40</width>
+           <height>20</height>
+          </size>
+         </property>
         </spacer>
        </item>
        <item>
-        <widget class="QLineEdit" name="faceshiftHostnameEdit">
-           <property name="font">
-            <font>
-             <family>Arial</family>
-            </font>
-           </property>
-           <property name="layoutDirection">
-            <enum>Qt::LeftToRight</enum>
-           </property>
-           <property name="styleSheet">
-            <string notr="true"/>
-           </property>
-           <property name="placeholderText">
-            <string>localhost</string>
-           </property>
-          </widget>
+        <widget class="QSpinBox" name="outputStarveDetectionThresholdSpinner">
+         <property name="sizePolicy">
+          <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+           <horstretch>0</horstretch>
+           <verstretch>0</verstretch>
+          </sizepolicy>
+         </property>
+         <property name="minimumSize">
+          <size>
+           <width>100</width>
+           <height>0</height>
+          </size>
+         </property>
+         <property name="maximumSize">
+          <size>
+           <width>70</width>
+           <height>16777215</height>
+          </size>
+         </property>
+         <property name="font">
+          <font>
+           <family>Arial</family>
+          </font>
+         </property>
+         <property name="minimum">
+          <number>1</number>
+         </property>
+         <property name="maximum">
+          <number>500</number>
+         </property>
+         <property name="value">
+          <number>1</number>
+         </property>
+        </widget>
        </item>
       </layout>
-     </item>   
+     </item>
+     <item>
+      <layout class="QHBoxLayout" name="horizontalLayout_25">
+       <property name="spacing">
+        <number>0</number>
+       </property>
+       <property name="topMargin">
+        <number>7</number>
+       </property>
+       <property name="rightMargin">
+        <number>0</number>
+       </property>
+       <property name="bottomMargin">
+        <number>7</number>
+       </property>
+       <item alignment="Qt::AlignLeft">
+        <widget class="QLabel" name="label_22">
+         <property name="font">
+          <font>
+           <family>Arial</family>
+          </font>
+         </property>
+         <property name="text">
+          <string>Output Starve Detection Period (ms)</string>
+         </property>
+         <property name="indent">
+          <number>0</number>
+         </property>
+         <property name="buddy">
+          <cstring>windowSecondsForDesiredReductionSpin</cstring>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <spacer name="horizontalSpacer_27">
+         <property name="font">
+          <font>
+           <family>Arial</family>
+          </font>
+         </property>
+         <property name="orientation">
+          <enum>Qt::Horizontal</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>40</width>
+           <height>20</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+       <item>
+        <widget class="QSpinBox" name="outputStarveDetectionPeriodSpinner">
+         <property name="sizePolicy">
+          <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+           <horstretch>0</horstretch>
+           <verstretch>0</verstretch>
+          </sizepolicy>
+         </property>
+         <property name="minimumSize">
+          <size>
+           <width>100</width>
+           <height>0</height>
+          </size>
+         </property>
+         <property name="maximumSize">
+          <size>
+           <width>70</width>
+           <height>16777215</height>
+          </size>
+         </property>
+         <property name="font">
+          <font>
+           <family>Arial</family>
+          </font>
+         </property>
+         <property name="minimum">
+          <number>1</number>
+         </property>
+         <property name="maximum">
+          <number>999999999</number>
+         </property>
+         <property name="value">
+          <number>1</number>
+         </property>
+        </widget>
+       </item>
+      </layout>
+     </item>
      <item>
       <widget class="QLabel" name="voxelsTitleLabel">
        <property name="sizePolicy">