Fix some chromium-style warnings in webrtc/modules/audio_device/

BUG=163
R=xians@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1897005

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@4426 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/modules/audio_device/audio_device.gypi b/modules/audio_device/audio_device.gypi
index 54b36d4..a2463f6 100644
--- a/modules/audio_device/audio_device.gypi
+++ b/modules/audio_device/audio_device.gypi
@@ -40,7 +40,9 @@
         'audio_device_impl.cc',
         'audio_device_impl.h',
         'audio_device_config.h',
+        'dummy/audio_device_dummy.cc',
         'dummy/audio_device_dummy.h',
+        'dummy/audio_device_utility_dummy.cc',
         'dummy/audio_device_utility_dummy.h',
       ],
       'conditions': [
diff --git a/modules/audio_device/audio_device_impl.h b/modules/audio_device/audio_device_impl.h
index d34543b..26bd543 100644
--- a/modules/audio_device/audio_device_impl.h
+++ b/modules/audio_device/audio_device_impl.h
@@ -43,9 +43,9 @@
     virtual ~AudioDeviceModuleImpl();
 
 public: // RefCountedModule
-    virtual int32_t ChangeUniqueId(const int32_t id);
-    virtual int32_t TimeUntilNextProcess();
-    virtual int32_t Process();
+    virtual int32_t ChangeUniqueId(const int32_t id) OVERRIDE;
+    virtual int32_t TimeUntilNextProcess() OVERRIDE;
+    virtual int32_t Process() OVERRIDE;
 
 public:
     // Factory methods (resource allocation/deallocation)
@@ -54,154 +54,155 @@
         const AudioLayer audioLayer = kPlatformDefaultAudio);
 
     // Retrieve the currently utilized audio layer
-    virtual int32_t ActiveAudioLayer(AudioLayer* audioLayer) const;
+    virtual int32_t ActiveAudioLayer(AudioLayer* audioLayer) const OVERRIDE;
 
     // Error handling
-    virtual ErrorCode LastError() const;
+    virtual ErrorCode LastError() const OVERRIDE;
     virtual int32_t RegisterEventObserver(
-        AudioDeviceObserver* eventCallback);
+        AudioDeviceObserver* eventCallback) OVERRIDE;
 
     // Full-duplex transportation of PCM audio
     virtual int32_t RegisterAudioCallback(
-        AudioTransport* audioCallback);
+        AudioTransport* audioCallback) OVERRIDE;
 
     // Main initializaton and termination
-    virtual int32_t Init();
-    virtual int32_t Terminate();
-    virtual bool Initialized() const;
+    virtual int32_t Init() OVERRIDE;
+    virtual int32_t Terminate() OVERRIDE;
+    virtual bool Initialized() const OVERRIDE;
 
     // Device enumeration
-    virtual int16_t PlayoutDevices();
-    virtual int16_t RecordingDevices();
+    virtual int16_t PlayoutDevices() OVERRIDE;
+    virtual int16_t RecordingDevices() OVERRIDE;
     virtual int32_t PlayoutDeviceName(
         uint16_t index,
         char name[kAdmMaxDeviceNameSize],
-        char guid[kAdmMaxGuidSize]);
+        char guid[kAdmMaxGuidSize]) OVERRIDE;
     virtual int32_t RecordingDeviceName(
         uint16_t index,
         char name[kAdmMaxDeviceNameSize],
-        char guid[kAdmMaxGuidSize]);
+        char guid[kAdmMaxGuidSize]) OVERRIDE;
 
     // Device selection
-    virtual int32_t SetPlayoutDevice(uint16_t index);
-    virtual int32_t SetPlayoutDevice(WindowsDeviceType device);
-    virtual int32_t SetRecordingDevice(uint16_t index);
-    virtual int32_t SetRecordingDevice(WindowsDeviceType device);
+    virtual int32_t SetPlayoutDevice(uint16_t index) OVERRIDE;
+    virtual int32_t SetPlayoutDevice(WindowsDeviceType device) OVERRIDE;
+    virtual int32_t SetRecordingDevice(uint16_t index) OVERRIDE;
+    virtual int32_t SetRecordingDevice(WindowsDeviceType device) OVERRIDE;
 
     // Audio transport initialization
-    virtual int32_t PlayoutIsAvailable(bool* available);
-    virtual int32_t InitPlayout();
-    virtual bool PlayoutIsInitialized() const;
-    virtual int32_t RecordingIsAvailable(bool* available);
-    virtual int32_t InitRecording();
-    virtual bool RecordingIsInitialized() const;
+    virtual int32_t PlayoutIsAvailable(bool* available) OVERRIDE;
+    virtual int32_t InitPlayout() OVERRIDE;
+    virtual bool PlayoutIsInitialized() const OVERRIDE;
+    virtual int32_t RecordingIsAvailable(bool* available) OVERRIDE;
+    virtual int32_t InitRecording() OVERRIDE;
+    virtual bool RecordingIsInitialized() const OVERRIDE;
 
     // Audio transport control
-    virtual int32_t StartPlayout();
-    virtual int32_t StopPlayout();
-    virtual bool Playing() const;
-    virtual int32_t StartRecording();
-    virtual int32_t StopRecording();
-    virtual bool Recording() const;
+    virtual int32_t StartPlayout() OVERRIDE;
+    virtual int32_t StopPlayout() OVERRIDE;
+    virtual bool Playing() const OVERRIDE;
+    virtual int32_t StartRecording() OVERRIDE;
+    virtual int32_t StopRecording() OVERRIDE;
+    virtual bool Recording() const OVERRIDE;
 
     // Microphone Automatic Gain Control (AGC)
-    virtual int32_t SetAGC(bool enable);
-    virtual bool AGC() const;
+    virtual int32_t SetAGC(bool enable) OVERRIDE;
+    virtual bool AGC() const OVERRIDE;
 
     // Volume control based on the Windows Wave API (Windows only)
-    virtual int32_t SetWaveOutVolume(uint16_t volumeLeft, uint16_t volumeRight);
+    virtual int32_t SetWaveOutVolume(uint16_t volumeLeft,
+                                     uint16_t volumeRight) OVERRIDE;
     virtual int32_t WaveOutVolume(uint16_t* volumeLeft,
-                                  uint16_t* volumeRight) const;
+                                  uint16_t* volumeRight) const OVERRIDE;
 
     // Audio mixer initialization
-    virtual int32_t SpeakerIsAvailable(bool* available);
-    virtual int32_t InitSpeaker();
-    virtual bool SpeakerIsInitialized() const;
-    virtual int32_t MicrophoneIsAvailable(bool* available);
-    virtual int32_t InitMicrophone();
-    virtual bool MicrophoneIsInitialized() const;
+    virtual int32_t SpeakerIsAvailable(bool* available) OVERRIDE;
+    virtual int32_t InitSpeaker() OVERRIDE;
+    virtual bool SpeakerIsInitialized() const OVERRIDE;
+    virtual int32_t MicrophoneIsAvailable(bool* available) OVERRIDE;
+    virtual int32_t InitMicrophone() OVERRIDE;
+    virtual bool MicrophoneIsInitialized() const OVERRIDE;
 
     // Speaker volume controls
-    virtual int32_t SpeakerVolumeIsAvailable(bool* available);
-    virtual int32_t SetSpeakerVolume(uint32_t volume);
-    virtual int32_t SpeakerVolume(uint32_t* volume) const;
-    virtual int32_t MaxSpeakerVolume(uint32_t* maxVolume) const;
-    virtual int32_t MinSpeakerVolume(uint32_t* minVolume) const;
+    virtual int32_t SpeakerVolumeIsAvailable(bool* available) OVERRIDE;
+    virtual int32_t SetSpeakerVolume(uint32_t volume) OVERRIDE;
+    virtual int32_t SpeakerVolume(uint32_t* volume) const OVERRIDE;
+    virtual int32_t MaxSpeakerVolume(uint32_t* maxVolume) const OVERRIDE;
+    virtual int32_t MinSpeakerVolume(uint32_t* minVolume) const OVERRIDE;
     virtual int32_t SpeakerVolumeStepSize(
-        uint16_t* stepSize) const;
+        uint16_t* stepSize) const OVERRIDE;
 
     // Microphone volume controls
-    virtual int32_t MicrophoneVolumeIsAvailable(bool* available);
-    virtual int32_t SetMicrophoneVolume(uint32_t volume);
-    virtual int32_t MicrophoneVolume(uint32_t* volume) const;
+    virtual int32_t MicrophoneVolumeIsAvailable(bool* available) OVERRIDE;
+    virtual int32_t SetMicrophoneVolume(uint32_t volume) OVERRIDE;
+    virtual int32_t MicrophoneVolume(uint32_t* volume) const OVERRIDE;
     virtual int32_t MaxMicrophoneVolume(
-        uint32_t* maxVolume) const;
+        uint32_t* maxVolume) const OVERRIDE;
     virtual int32_t MinMicrophoneVolume(
-        uint32_t* minVolume) const;
+        uint32_t* minVolume) const OVERRIDE;
     virtual int32_t MicrophoneVolumeStepSize(
-        uint16_t* stepSize) const;
+        uint16_t* stepSize) const OVERRIDE;
 
     // Speaker mute control
-    virtual int32_t SpeakerMuteIsAvailable(bool* available);
-    virtual int32_t SetSpeakerMute(bool enable);
-    virtual int32_t SpeakerMute(bool* enabled) const;
+    virtual int32_t SpeakerMuteIsAvailable(bool* available) OVERRIDE;
+    virtual int32_t SetSpeakerMute(bool enable) OVERRIDE;
+    virtual int32_t SpeakerMute(bool* enabled) const OVERRIDE;
 
     // Microphone mute control
-    virtual int32_t MicrophoneMuteIsAvailable(bool* available);
-    virtual int32_t SetMicrophoneMute(bool enable);
-    virtual int32_t MicrophoneMute(bool* enabled) const;
+    virtual int32_t MicrophoneMuteIsAvailable(bool* available) OVERRIDE;
+    virtual int32_t SetMicrophoneMute(bool enable) OVERRIDE;
+    virtual int32_t MicrophoneMute(bool* enabled) const OVERRIDE;
 
     // Microphone boost control
-    virtual int32_t MicrophoneBoostIsAvailable(bool* available);
-    virtual int32_t SetMicrophoneBoost(bool enable);
-    virtual int32_t MicrophoneBoost(bool* enabled) const;
+    virtual int32_t MicrophoneBoostIsAvailable(bool* available) OVERRIDE;
+    virtual int32_t SetMicrophoneBoost(bool enable) OVERRIDE;
+    virtual int32_t MicrophoneBoost(bool* enabled) const OVERRIDE;
 
     // Stereo support
-    virtual int32_t StereoPlayoutIsAvailable(bool* available) const;
-    virtual int32_t SetStereoPlayout(bool enable);
-    virtual int32_t StereoPlayout(bool* enabled) const;
-    virtual int32_t StereoRecordingIsAvailable(bool* available) const;
-    virtual int32_t SetStereoRecording(bool enable);
-    virtual int32_t StereoRecording(bool* enabled) const;
-    virtual int32_t SetRecordingChannel(const ChannelType channel);
-    virtual int32_t RecordingChannel(ChannelType* channel) const;
+    virtual int32_t StereoPlayoutIsAvailable(bool* available) const OVERRIDE;
+    virtual int32_t SetStereoPlayout(bool enable) OVERRIDE;
+    virtual int32_t StereoPlayout(bool* enabled) const OVERRIDE;
+    virtual int32_t StereoRecordingIsAvailable(bool* available) const OVERRIDE;
+    virtual int32_t SetStereoRecording(bool enable) OVERRIDE;
+    virtual int32_t StereoRecording(bool* enabled) const OVERRIDE;
+    virtual int32_t SetRecordingChannel(const ChannelType channel) OVERRIDE;
+    virtual int32_t RecordingChannel(ChannelType* channel) const OVERRIDE;
 
     // Delay information and control
     virtual int32_t SetPlayoutBuffer(const BufferType type,
-                                           uint16_t sizeMS = 0);
+                                           uint16_t sizeMS = 0) OVERRIDE;
     virtual int32_t PlayoutBuffer(BufferType* type,
-                                        uint16_t* sizeMS) const;
-    virtual int32_t PlayoutDelay(uint16_t* delayMS) const;
-    virtual int32_t RecordingDelay(uint16_t* delayMS) const;
+                                        uint16_t* sizeMS) const OVERRIDE;
+    virtual int32_t PlayoutDelay(uint16_t* delayMS) const OVERRIDE;
+    virtual int32_t RecordingDelay(uint16_t* delayMS) const OVERRIDE;
 
     // CPU load
-    virtual int32_t CPULoad(uint16_t* load) const;
+    virtual int32_t CPULoad(uint16_t* load) const OVERRIDE;
 
     // Recording of raw PCM data
     virtual int32_t StartRawOutputFileRecording(
-        const char pcmFileNameUTF8[kAdmMaxFileNameSize]);
-    virtual int32_t StopRawOutputFileRecording();
+        const char pcmFileNameUTF8[kAdmMaxFileNameSize]) OVERRIDE;
+    virtual int32_t StopRawOutputFileRecording() OVERRIDE;
     virtual int32_t StartRawInputFileRecording(
-        const char pcmFileNameUTF8[kAdmMaxFileNameSize]);
-    virtual int32_t StopRawInputFileRecording();
+        const char pcmFileNameUTF8[kAdmMaxFileNameSize]) OVERRIDE;
+    virtual int32_t StopRawInputFileRecording() OVERRIDE;
 
     // Native sample rate controls (samples/sec)
     virtual int32_t SetRecordingSampleRate(
-        const uint32_t samplesPerSec);
+        const uint32_t samplesPerSec) OVERRIDE;
     virtual int32_t RecordingSampleRate(
-        uint32_t* samplesPerSec) const;
+        uint32_t* samplesPerSec) const OVERRIDE;
     virtual int32_t SetPlayoutSampleRate(
-        const uint32_t samplesPerSec);
+        const uint32_t samplesPerSec) OVERRIDE;
     virtual int32_t PlayoutSampleRate(
-        uint32_t* samplesPerSec) const;
+        uint32_t* samplesPerSec) const OVERRIDE;
 
     // Mobile device specific functions
-    virtual int32_t ResetAudioDevice();
-    virtual int32_t SetLoudspeakerStatus(bool enable);
-    virtual int32_t GetLoudspeakerStatus(bool* enabled) const;
+    virtual int32_t ResetAudioDevice() OVERRIDE;
+    virtual int32_t SetLoudspeakerStatus(bool enable) OVERRIDE;
+    virtual int32_t GetLoudspeakerStatus(bool* enabled) const OVERRIDE;
 
-    virtual int32_t EnableBuiltInAEC(bool enable);
-    virtual bool BuiltInAECIsEnabled() const;
+    virtual int32_t EnableBuiltInAEC(bool enable) OVERRIDE;
+    virtual bool BuiltInAECIsEnabled() const OVERRIDE;
 
 public:
     int32_t Id() {return _id;}
diff --git a/modules/audio_device/dummy/audio_device_dummy.cc b/modules/audio_device/dummy/audio_device_dummy.cc
new file mode 100644
index 0000000..379b257
--- /dev/null
+++ b/modules/audio_device/dummy/audio_device_dummy.cc
@@ -0,0 +1,219 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/modules/audio_device/dummy/audio_device_dummy.h"
+
+namespace webrtc {
+
+int32_t AudioDeviceDummy::ActiveAudioLayer(
+    AudioDeviceModule::AudioLayer& audioLayer) const {
+  return -1;
+}
+
+int32_t AudioDeviceDummy::Init() { return 0; }
+
+int32_t AudioDeviceDummy::Terminate() { return 0; }
+
+bool AudioDeviceDummy::Initialized() const { return true; }
+
+int16_t AudioDeviceDummy::PlayoutDevices() { return -1; }
+
+int16_t AudioDeviceDummy::RecordingDevices() { return -1; }
+
+int32_t AudioDeviceDummy::PlayoutDeviceName(uint16_t index,
+                                            char name[kAdmMaxDeviceNameSize],
+                                            char guid[kAdmMaxGuidSize]) {
+  return -1;
+}
+
+int32_t AudioDeviceDummy::RecordingDeviceName(uint16_t index,
+                                              char name[kAdmMaxDeviceNameSize],
+                                              char guid[kAdmMaxGuidSize]) {
+  return -1;
+}
+
+int32_t AudioDeviceDummy::SetPlayoutDevice(uint16_t index) { return -1; }
+
+int32_t AudioDeviceDummy::SetPlayoutDevice(
+    AudioDeviceModule::WindowsDeviceType device) {
+  return -1;
+}
+
+int32_t AudioDeviceDummy::SetRecordingDevice(uint16_t index) { return -1; }
+
+int32_t AudioDeviceDummy::SetRecordingDevice(
+    AudioDeviceModule::WindowsDeviceType device) {
+  return -1;
+}
+
+int32_t AudioDeviceDummy::PlayoutIsAvailable(bool& available) { return -1; }
+
+int32_t AudioDeviceDummy::InitPlayout() { return -1; }
+
+bool AudioDeviceDummy::PlayoutIsInitialized() const { return false; }
+
+int32_t AudioDeviceDummy::RecordingIsAvailable(bool& available) { return -1; }
+
+int32_t AudioDeviceDummy::InitRecording() { return -1; }
+
+bool AudioDeviceDummy::RecordingIsInitialized() const { return false; }
+
+int32_t AudioDeviceDummy::StartPlayout() { return -1; }
+
+int32_t AudioDeviceDummy::StopPlayout() { return -1; }
+
+bool AudioDeviceDummy::Playing() const { return false; }
+
+int32_t AudioDeviceDummy::StartRecording() { return -1; }
+
+int32_t AudioDeviceDummy::StopRecording() { return -1; }
+
+bool AudioDeviceDummy::Recording() const { return false; }
+
+int32_t AudioDeviceDummy::SetAGC(bool enable) { return -1; }
+
+bool AudioDeviceDummy::AGC() const { return false; }
+
+int32_t AudioDeviceDummy::SetWaveOutVolume(uint16_t volumeLeft,
+                                           uint16_t volumeRight) {
+  return -1;
+}
+
+int32_t AudioDeviceDummy::WaveOutVolume(uint16_t& volumeLeft,
+                                        uint16_t& volumeRight) const {
+  return -1;
+}
+
+int32_t AudioDeviceDummy::SpeakerIsAvailable(bool& available) { return -1; }
+
+int32_t AudioDeviceDummy::InitSpeaker() { return -1; }
+
+bool AudioDeviceDummy::SpeakerIsInitialized() const { return false; }
+
+int32_t AudioDeviceDummy::MicrophoneIsAvailable(bool& available) { return -1; }
+
+int32_t AudioDeviceDummy::InitMicrophone() { return -1; }
+
+bool AudioDeviceDummy::MicrophoneIsInitialized() const { return false; }
+
+int32_t AudioDeviceDummy::SpeakerVolumeIsAvailable(bool& available) {
+  return -1;
+}
+
+int32_t AudioDeviceDummy::SetSpeakerVolume(uint32_t volume) { return -1; }
+
+int32_t AudioDeviceDummy::SpeakerVolume(uint32_t& volume) const { return -1; }
+
+int32_t AudioDeviceDummy::MaxSpeakerVolume(uint32_t& maxVolume) const {
+  return -1;
+}
+
+int32_t AudioDeviceDummy::MinSpeakerVolume(uint32_t& minVolume) const {
+  return -1;
+}
+
+int32_t AudioDeviceDummy::SpeakerVolumeStepSize(uint16_t& stepSize) const {
+  return -1;
+}
+
+int32_t AudioDeviceDummy::MicrophoneVolumeIsAvailable(bool& available) {
+  return -1;
+}
+
+int32_t AudioDeviceDummy::SetMicrophoneVolume(uint32_t volume) { return -1; }
+
+int32_t AudioDeviceDummy::MicrophoneVolume(uint32_t& volume) const {
+  return -1;
+}
+
+int32_t AudioDeviceDummy::MaxMicrophoneVolume(uint32_t& maxVolume) const {
+  return -1;
+}
+
+int32_t AudioDeviceDummy::MinMicrophoneVolume(uint32_t& minVolume) const {
+  return -1;
+}
+
+int32_t AudioDeviceDummy::MicrophoneVolumeStepSize(uint16_t& stepSize) const {
+  return -1;
+}
+
+int32_t AudioDeviceDummy::SpeakerMuteIsAvailable(bool& available) { return -1; }
+
+int32_t AudioDeviceDummy::SetSpeakerMute(bool enable) { return -1; }
+
+int32_t AudioDeviceDummy::SpeakerMute(bool& enabled) const { return -1; }
+
+int32_t AudioDeviceDummy::MicrophoneMuteIsAvailable(bool& available) {
+  return -1;
+}
+
+int32_t AudioDeviceDummy::SetMicrophoneMute(bool enable) { return -1; }
+
+int32_t AudioDeviceDummy::MicrophoneMute(bool& enabled) const { return -1; }
+
+int32_t AudioDeviceDummy::MicrophoneBoostIsAvailable(bool& available) {
+  return -1;
+}
+
+int32_t AudioDeviceDummy::SetMicrophoneBoost(bool enable) { return -1; }
+
+int32_t AudioDeviceDummy::MicrophoneBoost(bool& enabled) const { return -1; }
+
+int32_t AudioDeviceDummy::StereoPlayoutIsAvailable(bool& available) {
+  return -1;
+}
+int32_t AudioDeviceDummy::SetStereoPlayout(bool enable) { return -1; }
+
+int32_t AudioDeviceDummy::StereoPlayout(bool& enabled) const { return -1; }
+
+int32_t AudioDeviceDummy::StereoRecordingIsAvailable(bool& available) {
+  return -1;
+}
+
+int32_t AudioDeviceDummy::SetStereoRecording(bool enable) { return -1; }
+
+int32_t AudioDeviceDummy::StereoRecording(bool& enabled) const { return -1; }
+
+int32_t AudioDeviceDummy::SetPlayoutBuffer(
+    const AudioDeviceModule::BufferType type,
+    uint16_t sizeMS) {
+  return -1;
+}
+
+int32_t AudioDeviceDummy::PlayoutBuffer(AudioDeviceModule::BufferType& type,
+                                        uint16_t& sizeMS) const {
+  return -1;
+}
+
+int32_t AudioDeviceDummy::PlayoutDelay(uint16_t& delayMS) const { return -1; }
+
+int32_t AudioDeviceDummy::RecordingDelay(uint16_t& delayMS) const { return -1; }
+
+int32_t AudioDeviceDummy::CPULoad(uint16_t& load) const { return -1; }
+
+bool AudioDeviceDummy::PlayoutWarning() const { return false; }
+
+bool AudioDeviceDummy::PlayoutError() const { return false; }
+
+bool AudioDeviceDummy::RecordingWarning() const { return false; }
+
+bool AudioDeviceDummy::RecordingError() const { return false; }
+
+void AudioDeviceDummy::ClearPlayoutWarning() {}
+
+void AudioDeviceDummy::ClearPlayoutError() {}
+
+void AudioDeviceDummy::ClearRecordingWarning() {}
+
+void AudioDeviceDummy::ClearRecordingError() {}
+
+void AudioDeviceDummy::AttachAudioBuffer(AudioDeviceBuffer* audioBuffer) {}
+}  // namespace webrtc
diff --git a/modules/audio_device/dummy/audio_device_dummy.h b/modules/audio_device/dummy/audio_device_dummy.h
index 78baa2e..47d7aab 100644
--- a/modules/audio_device/dummy/audio_device_dummy.h
+++ b/modules/audio_device/dummy/audio_device_dummy.h
@@ -17,172 +17,132 @@
 
 namespace webrtc {
 
-class AudioDeviceDummy : public AudioDeviceGeneric
-{
-public:
-    AudioDeviceDummy(const int32_t id) {}
-    ~AudioDeviceDummy() {}
+class AudioDeviceDummy : public AudioDeviceGeneric {
+ public:
+  AudioDeviceDummy(const int32_t id) {}
+  virtual ~AudioDeviceDummy() {}
 
-    // Retrieve the currently utilized audio layer
-    virtual int32_t ActiveAudioLayer(
-        AudioDeviceModule::AudioLayer& audioLayer) const { return -1; }
+  // Retrieve the currently utilized audio layer
+  virtual int32_t ActiveAudioLayer(
+      AudioDeviceModule::AudioLayer& audioLayer) const OVERRIDE;
 
-    // Main initializaton and termination
-    virtual int32_t Init() { return 0; }
-    virtual int32_t Terminate() { return 0; }
-    virtual bool Initialized() const { return true; }
+  // Main initializaton and termination
+  virtual int32_t Init() OVERRIDE;
+  virtual int32_t Terminate() OVERRIDE;
+  virtual bool Initialized() const OVERRIDE;
 
-    // Device enumeration
-    virtual int16_t PlayoutDevices() { return -1; }
-    virtual int16_t RecordingDevices() { return -1; }
-    virtual int32_t PlayoutDeviceName(
-        uint16_t index,
-        char name[kAdmMaxDeviceNameSize],
-        char guid[kAdmMaxGuidSize]) { return -1; }
-    virtual int32_t RecordingDeviceName(
-        uint16_t index,
-        char name[kAdmMaxDeviceNameSize],
-        char guid[kAdmMaxGuidSize]) { return -1; }
+  // Device enumeration
+  virtual int16_t PlayoutDevices() OVERRIDE;
+  virtual int16_t RecordingDevices() OVERRIDE;
+  virtual int32_t PlayoutDeviceName(uint16_t index,
+                                    char name[kAdmMaxDeviceNameSize],
+                                    char guid[kAdmMaxGuidSize]) OVERRIDE;
+  virtual int32_t RecordingDeviceName(uint16_t index,
+                                      char name[kAdmMaxDeviceNameSize],
+                                      char guid[kAdmMaxGuidSize]) OVERRIDE;
 
-    // Device selection
-    virtual int32_t SetPlayoutDevice(uint16_t index) { return -1; }
-    virtual int32_t SetPlayoutDevice(
-        AudioDeviceModule::WindowsDeviceType device) { return -1; }
-    virtual int32_t SetRecordingDevice(uint16_t index) {
-      return -1;
-    }
-    virtual int32_t SetRecordingDevice(
-        AudioDeviceModule::WindowsDeviceType device) { return -1; }
+  // Device selection
+  virtual int32_t SetPlayoutDevice(uint16_t index) OVERRIDE;
+  virtual int32_t SetPlayoutDevice(
+      AudioDeviceModule::WindowsDeviceType device) OVERRIDE;
+  virtual int32_t SetRecordingDevice(uint16_t index) OVERRIDE;
+  virtual int32_t SetRecordingDevice(
+      AudioDeviceModule::WindowsDeviceType device) OVERRIDE;
 
-    // Audio transport initialization
-    virtual int32_t PlayoutIsAvailable(bool& available) {
-      return -1; }
-    virtual int32_t InitPlayout() { return -1; };
-    virtual bool PlayoutIsInitialized() const { return false; }
-    virtual int32_t RecordingIsAvailable(bool& available) { return -1; }
-    virtual int32_t InitRecording() { return -1; }
-    virtual bool RecordingIsInitialized() const { return false; }
+  // Audio transport initialization
+  virtual int32_t PlayoutIsAvailable(bool& available) OVERRIDE;
+  virtual int32_t InitPlayout() OVERRIDE;
+  virtual bool PlayoutIsInitialized() const OVERRIDE;
+  virtual int32_t RecordingIsAvailable(bool& available) OVERRIDE;
+  virtual int32_t InitRecording() OVERRIDE;
+  virtual bool RecordingIsInitialized() const OVERRIDE;
 
-    // Audio transport control
-    virtual int32_t StartPlayout() { return -1; }
-    virtual int32_t StopPlayout() { return -1; }
-    virtual bool Playing() const { return false; }
-    virtual int32_t StartRecording() { return -1; }
-    virtual int32_t StopRecording() { return -1; }
-    virtual bool Recording() const { return false; }
+  // Audio transport control
+  virtual int32_t StartPlayout() OVERRIDE;
+  virtual int32_t StopPlayout() OVERRIDE;
+  virtual bool Playing() const OVERRIDE;
+  virtual int32_t StartRecording() OVERRIDE;
+  virtual int32_t StopRecording() OVERRIDE;
+  virtual bool Recording() const OVERRIDE;
 
-    // Microphone Automatic Gain Control (AGC)
-    virtual int32_t SetAGC(bool enable) { return -1; }
-    virtual bool AGC() const { return false; }
+  // Microphone Automatic Gain Control (AGC)
+  virtual int32_t SetAGC(bool enable) OVERRIDE;
+  virtual bool AGC() const OVERRIDE;
 
-    // Volume control based on the Windows Wave API (Windows only)
-    virtual int32_t SetWaveOutVolume(
-        uint16_t volumeLeft, uint16_t volumeRight) { return -1; }
-    virtual int32_t WaveOutVolume(
-        uint16_t& volumeLeft,
-        uint16_t& volumeRight) const { return -1; }
+  // Volume control based on the Windows Wave API (Windows only)
+  virtual int32_t SetWaveOutVolume(uint16_t volumeLeft,
+                                   uint16_t volumeRight) OVERRIDE;
+  virtual int32_t WaveOutVolume(uint16_t& volumeLeft,
+                                uint16_t& volumeRight) const OVERRIDE;
 
-    // Audio mixer initialization
-    virtual int32_t SpeakerIsAvailable(bool& available) { return -1; }
-    virtual int32_t InitSpeaker() { return -1; }
-    virtual bool SpeakerIsInitialized() const { return false; }
-    virtual int32_t MicrophoneIsAvailable(bool& available) { return -1; }
-    virtual int32_t InitMicrophone() { return -1; }
-    virtual bool MicrophoneIsInitialized() const { return false; }
+  // Audio mixer initialization
+  virtual int32_t SpeakerIsAvailable(bool& available) OVERRIDE;
+  virtual int32_t InitSpeaker() OVERRIDE;
+  virtual bool SpeakerIsInitialized() const OVERRIDE;
+  virtual int32_t MicrophoneIsAvailable(bool& available) OVERRIDE;
+  virtual int32_t InitMicrophone() OVERRIDE;
+  virtual bool MicrophoneIsInitialized() const OVERRIDE;
 
-    // Speaker volume controls
-    virtual int32_t SpeakerVolumeIsAvailable(bool& available) {
-      return -1;
-    }
-    virtual int32_t SetSpeakerVolume(uint32_t volume) { return -1; }
-    virtual int32_t SpeakerVolume(uint32_t& volume) const {
-      return -1;
-    }
-    virtual int32_t MaxSpeakerVolume(uint32_t& maxVolume) const {
-      return -1;
-    }
-    virtual int32_t MinSpeakerVolume(uint32_t& minVolume) const {
-      return -1;
-    }
-    virtual int32_t SpeakerVolumeStepSize(
-        uint16_t& stepSize) const { return -1; }
+  // Speaker volume controls
+  virtual int32_t SpeakerVolumeIsAvailable(bool& available) OVERRIDE;
+  virtual int32_t SetSpeakerVolume(uint32_t volume) OVERRIDE;
+  virtual int32_t SpeakerVolume(uint32_t& volume) const OVERRIDE;
+  virtual int32_t MaxSpeakerVolume(uint32_t& maxVolume) const OVERRIDE;
+  virtual int32_t MinSpeakerVolume(uint32_t& minVolume) const OVERRIDE;
+  virtual int32_t SpeakerVolumeStepSize(uint16_t& stepSize) const OVERRIDE;
 
-    // Microphone volume controls
-    virtual int32_t MicrophoneVolumeIsAvailable(bool& available) {
-      return -1;
-    }
-    virtual int32_t SetMicrophoneVolume(uint32_t volume) {
-      return -1;
-    }
-    virtual int32_t MicrophoneVolume(uint32_t& volume) const {
-      return -1;
-    }
-    virtual int32_t MaxMicrophoneVolume(uint32_t& maxVolume) const {
-      return -1;
-    }
-    virtual int32_t MinMicrophoneVolume(
-        uint32_t& minVolume) const { return -1; }
-    virtual int32_t MicrophoneVolumeStepSize(
-        uint16_t& stepSize) const { return -1; }
+  // Microphone volume controls
+  virtual int32_t MicrophoneVolumeIsAvailable(bool& available) OVERRIDE;
+  virtual int32_t SetMicrophoneVolume(uint32_t volume) OVERRIDE;
+  virtual int32_t MicrophoneVolume(uint32_t& volume) const OVERRIDE;
+  virtual int32_t MaxMicrophoneVolume(uint32_t& maxVolume) const OVERRIDE;
+  virtual int32_t MinMicrophoneVolume(uint32_t& minVolume) const OVERRIDE;
+  virtual int32_t MicrophoneVolumeStepSize(uint16_t& stepSize) const OVERRIDE;
 
-    // Speaker mute control
-    virtual int32_t SpeakerMuteIsAvailable(bool& available) { return -1; }
-    virtual int32_t SetSpeakerMute(bool enable) { return -1; }
-    virtual int32_t SpeakerMute(bool& enabled) const { return -1; }
+  // Speaker mute control
+  virtual int32_t SpeakerMuteIsAvailable(bool& available) OVERRIDE;
+  virtual int32_t SetSpeakerMute(bool enable) OVERRIDE;
+  virtual int32_t SpeakerMute(bool& enabled) const OVERRIDE;
 
-    // Microphone mute control
-    virtual int32_t MicrophoneMuteIsAvailable(bool& available) {
-      return -1;
-    }
-    virtual int32_t SetMicrophoneMute(bool enable) { return -1; }
-    virtual int32_t MicrophoneMute(bool& enabled) const { return -1; }
+  // Microphone mute control
+  virtual int32_t MicrophoneMuteIsAvailable(bool& available) OVERRIDE;
+  virtual int32_t SetMicrophoneMute(bool enable) OVERRIDE;
+  virtual int32_t MicrophoneMute(bool& enabled) const OVERRIDE;
 
-    // Microphone boost control
-    virtual int32_t MicrophoneBoostIsAvailable(bool& available) {
-      return -1;
-    }
-    virtual int32_t SetMicrophoneBoost(bool enable) { return -1; }
-    virtual int32_t MicrophoneBoost(bool& enabled) const { return -1; }
+  // Microphone boost control
+  virtual int32_t MicrophoneBoostIsAvailable(bool& available) OVERRIDE;
+  virtual int32_t SetMicrophoneBoost(bool enable) OVERRIDE;
+  virtual int32_t MicrophoneBoost(bool& enabled) const OVERRIDE;
 
-    // Stereo support
-    virtual int32_t StereoPlayoutIsAvailable(bool& available) {
-      return -1;
-    }
-    virtual int32_t SetStereoPlayout(bool enable) { return -1; }
-    virtual int32_t StereoPlayout(bool& enabled) const { return -1; }
-    virtual int32_t StereoRecordingIsAvailable(bool& available) {
-      return -1;
-    }
-    virtual int32_t SetStereoRecording(bool enable) { return -1; }
-    virtual int32_t StereoRecording(bool& enabled) const { return -1; }
+  // Stereo support
+  virtual int32_t StereoPlayoutIsAvailable(bool& available) OVERRIDE;
+  virtual int32_t SetStereoPlayout(bool enable) OVERRIDE;
+  virtual int32_t StereoPlayout(bool& enabled) const OVERRIDE;
+  virtual int32_t StereoRecordingIsAvailable(bool& available) OVERRIDE;
+  virtual int32_t SetStereoRecording(bool enable) OVERRIDE;
+  virtual int32_t StereoRecording(bool& enabled) const OVERRIDE;
 
-    // Delay information and control
-    virtual int32_t SetPlayoutBuffer(
-        const AudioDeviceModule::BufferType type,
-        uint16_t sizeMS) { return -1; }
-    virtual int32_t PlayoutBuffer(
-        AudioDeviceModule::BufferType& type,
-        uint16_t& sizeMS) const { return -1; }
-    virtual int32_t PlayoutDelay(uint16_t& delayMS) const {
-      return -1;
-    }
-    virtual int32_t RecordingDelay(uint16_t& delayMS) const {
-      return -1;
-    }
+  // Delay information and control
+  virtual int32_t SetPlayoutBuffer(const AudioDeviceModule::BufferType type,
+                                   uint16_t sizeMS) OVERRIDE;
+  virtual int32_t PlayoutBuffer(AudioDeviceModule::BufferType& type,
+                                uint16_t& sizeMS) const OVERRIDE;
+  virtual int32_t PlayoutDelay(uint16_t& delayMS) const OVERRIDE;
+  virtual int32_t RecordingDelay(uint16_t& delayMS) const OVERRIDE;
 
-    // CPU load
-    virtual int32_t CPULoad(uint16_t& load) const { return -1; }
+  // CPU load
+  virtual int32_t CPULoad(uint16_t& load) const OVERRIDE;
 
-    virtual bool PlayoutWarning() const { return false; }
-    virtual bool PlayoutError() const { return false; }
-    virtual bool RecordingWarning() const { return false; }
-    virtual bool RecordingError() const { return false; }
-    virtual void ClearPlayoutWarning() {}
-    virtual void ClearPlayoutError() {}
-    virtual void ClearRecordingWarning() {}
-    virtual void ClearRecordingError() {}
+  virtual bool PlayoutWarning() const OVERRIDE;
+  virtual bool PlayoutError() const OVERRIDE;
+  virtual bool RecordingWarning() const OVERRIDE;
+  virtual bool RecordingError() const OVERRIDE;
+  virtual void ClearPlayoutWarning() OVERRIDE;
+  virtual void ClearPlayoutError() OVERRIDE;
+  virtual void ClearRecordingWarning() OVERRIDE;
+  virtual void ClearRecordingError() OVERRIDE;
 
-    virtual void AttachAudioBuffer(AudioDeviceBuffer* audioBuffer) {}
+  virtual void AttachAudioBuffer(AudioDeviceBuffer* audioBuffer) OVERRIDE;
 };
 
 }  // namespace webrtc
diff --git a/modules/audio_device/dummy/audio_device_utility_dummy.cc b/modules/audio_device/dummy/audio_device_utility_dummy.cc
new file mode 100644
index 0000000..5c7fa4f
--- /dev/null
+++ b/modules/audio_device/dummy/audio_device_utility_dummy.cc
@@ -0,0 +1,15 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#include "webrtc/modules/audio_device/dummy/audio_device_utility_dummy.h"
+
+namespace webrtc {
+  int32_t AudioDeviceUtilityDummy::Init() { return 0; }
+}  // namespace webrtc
+
diff --git a/modules/audio_device/dummy/audio_device_utility_dummy.h b/modules/audio_device/dummy/audio_device_utility_dummy.h
index 8ae89c8..e05e30b 100644
--- a/modules/audio_device/dummy/audio_device_utility_dummy.h
+++ b/modules/audio_device/dummy/audio_device_utility_dummy.h
@@ -22,11 +22,10 @@
 {
 public:
     AudioDeviceUtilityDummy(const int32_t id) {}
-    ~AudioDeviceUtilityDummy() {}
+    virtual ~AudioDeviceUtilityDummy() {}
 
-    virtual int32_t Init() { return 0; }
+    virtual int32_t Init() OVERRIDE;
 };
-
 }  // namespace webrtc
 
 #endif  // MODULES_AUDIO_DEVICE_MAIN_SOURCE_LINUX_AUDIO_DEVICE_UTILITY_DUMMY_H_
diff --git a/modules/audio_device/linux/audio_device_alsa_linux.h b/modules/audio_device/linux/audio_device_alsa_linux.h
index 9244758..35abc15 100644
--- a/modules/audio_device/linux/audio_device_alsa_linux.h
+++ b/modules/audio_device/linux/audio_device_alsa_linux.h
@@ -31,135 +31,136 @@
 {
 public:
     AudioDeviceLinuxALSA(const int32_t id);
-    ~AudioDeviceLinuxALSA();
+    virtual ~AudioDeviceLinuxALSA();
 
     // Retrieve the currently utilized audio layer
     virtual int32_t ActiveAudioLayer(
-        AudioDeviceModule::AudioLayer& audioLayer) const;
+        AudioDeviceModule::AudioLayer& audioLayer) const OVERRIDE;
 
     // Main initializaton and termination
-    virtual int32_t Init();
-    virtual int32_t Terminate();
-    virtual bool Initialized() const;
+    virtual int32_t Init() OVERRIDE;
+    virtual int32_t Terminate() OVERRIDE;
+    virtual bool Initialized() const OVERRIDE;
 
     // Device enumeration
-    virtual int16_t PlayoutDevices();
-    virtual int16_t RecordingDevices();
+    virtual int16_t PlayoutDevices() OVERRIDE;
+    virtual int16_t RecordingDevices() OVERRIDE;
     virtual int32_t PlayoutDeviceName(
         uint16_t index,
         char name[kAdmMaxDeviceNameSize],
-        char guid[kAdmMaxGuidSize]);
+        char guid[kAdmMaxGuidSize]) OVERRIDE;
     virtual int32_t RecordingDeviceName(
         uint16_t index,
         char name[kAdmMaxDeviceNameSize],
-        char guid[kAdmMaxGuidSize]);
+        char guid[kAdmMaxGuidSize]) OVERRIDE;
 
     // Device selection
-    virtual int32_t SetPlayoutDevice(uint16_t index);
+    virtual int32_t SetPlayoutDevice(uint16_t index) OVERRIDE;
     virtual int32_t SetPlayoutDevice(
-        AudioDeviceModule::WindowsDeviceType device);
-    virtual int32_t SetRecordingDevice(uint16_t index);
+        AudioDeviceModule::WindowsDeviceType device) OVERRIDE;
+    virtual int32_t SetRecordingDevice(uint16_t index) OVERRIDE;
     virtual int32_t SetRecordingDevice(
-        AudioDeviceModule::WindowsDeviceType device);
+        AudioDeviceModule::WindowsDeviceType device) OVERRIDE;
 
     // Audio transport initialization
-    virtual int32_t PlayoutIsAvailable(bool& available);
-    virtual int32_t InitPlayout();
-    virtual bool PlayoutIsInitialized() const;
-    virtual int32_t RecordingIsAvailable(bool& available);
-    virtual int32_t InitRecording();
-    virtual bool RecordingIsInitialized() const;
+    virtual int32_t PlayoutIsAvailable(bool& available) OVERRIDE;
+    virtual int32_t InitPlayout() OVERRIDE;
+    virtual bool PlayoutIsInitialized() const OVERRIDE;
+    virtual int32_t RecordingIsAvailable(bool& available) OVERRIDE;
+    virtual int32_t InitRecording() OVERRIDE;
+    virtual bool RecordingIsInitialized() const OVERRIDE;
 
     // Audio transport control
-    virtual int32_t StartPlayout();
-    virtual int32_t StopPlayout();
-    virtual bool Playing() const;
-    virtual int32_t StartRecording();
-    virtual int32_t StopRecording();
-    virtual bool Recording() const;
+    virtual int32_t StartPlayout() OVERRIDE;
+    virtual int32_t StopPlayout() OVERRIDE;
+    virtual bool Playing() const OVERRIDE;
+    virtual int32_t StartRecording() OVERRIDE;
+    virtual int32_t StopRecording() OVERRIDE;
+    virtual bool Recording() const OVERRIDE;
 
     // Microphone Automatic Gain Control (AGC)
-    virtual int32_t SetAGC(bool enable);
-    virtual bool AGC() const;
+    virtual int32_t SetAGC(bool enable) OVERRIDE;
+    virtual bool AGC() const OVERRIDE;
 
     // Volume control based on the Windows Wave API (Windows only)
-    virtual int32_t SetWaveOutVolume(uint16_t volumeLeft, uint16_t volumeRight);
+    virtual int32_t SetWaveOutVolume(uint16_t volumeLeft,
+                                     uint16_t volumeRight) OVERRIDE;
     virtual int32_t WaveOutVolume(uint16_t& volumeLeft,
-                                  uint16_t& volumeRight) const;
+                                  uint16_t& volumeRight) const OVERRIDE;
 
     // Audio mixer initialization
-    virtual int32_t SpeakerIsAvailable(bool& available);
-    virtual int32_t InitSpeaker();
-    virtual bool SpeakerIsInitialized() const;
-    virtual int32_t MicrophoneIsAvailable(bool& available);
-    virtual int32_t InitMicrophone();
-    virtual bool MicrophoneIsInitialized() const;
+    virtual int32_t SpeakerIsAvailable(bool& available) OVERRIDE;
+    virtual int32_t InitSpeaker() OVERRIDE;
+    virtual bool SpeakerIsInitialized() const OVERRIDE;
+    virtual int32_t MicrophoneIsAvailable(bool& available) OVERRIDE;
+    virtual int32_t InitMicrophone() OVERRIDE;
+    virtual bool MicrophoneIsInitialized() const OVERRIDE;
 
     // Speaker volume controls
-    virtual int32_t SpeakerVolumeIsAvailable(bool& available);
-    virtual int32_t SetSpeakerVolume(uint32_t volume);
-    virtual int32_t SpeakerVolume(uint32_t& volume) const;
-    virtual int32_t MaxSpeakerVolume(uint32_t& maxVolume) const;
-    virtual int32_t MinSpeakerVolume(uint32_t& minVolume) const;
-    virtual int32_t SpeakerVolumeStepSize(uint16_t& stepSize) const;
+    virtual int32_t SpeakerVolumeIsAvailable(bool& available) OVERRIDE;
+    virtual int32_t SetSpeakerVolume(uint32_t volume) OVERRIDE;
+    virtual int32_t SpeakerVolume(uint32_t& volume) const OVERRIDE;
+    virtual int32_t MaxSpeakerVolume(uint32_t& maxVolume) const OVERRIDE;
+    virtual int32_t MinSpeakerVolume(uint32_t& minVolume) const OVERRIDE;
+    virtual int32_t SpeakerVolumeStepSize(uint16_t& stepSize) const OVERRIDE;
 
     // Microphone volume controls
-    virtual int32_t MicrophoneVolumeIsAvailable(bool& available);
-    virtual int32_t SetMicrophoneVolume(uint32_t volume);
-    virtual int32_t MicrophoneVolume(uint32_t& volume) const;
-    virtual int32_t MaxMicrophoneVolume(uint32_t& maxVolume) const;
-    virtual int32_t MinMicrophoneVolume(uint32_t& minVolume) const;
+    virtual int32_t MicrophoneVolumeIsAvailable(bool& available) OVERRIDE;
+    virtual int32_t SetMicrophoneVolume(uint32_t volume) OVERRIDE;
+    virtual int32_t MicrophoneVolume(uint32_t& volume) const OVERRIDE;
+    virtual int32_t MaxMicrophoneVolume(uint32_t& maxVolume) const OVERRIDE;
+    virtual int32_t MinMicrophoneVolume(uint32_t& minVolume) const OVERRIDE;
     virtual int32_t MicrophoneVolumeStepSize(
-        uint16_t& stepSize) const;
+        uint16_t& stepSize) const OVERRIDE;
 
     // Speaker mute control
-    virtual int32_t SpeakerMuteIsAvailable(bool& available);
-    virtual int32_t SetSpeakerMute(bool enable);
-    virtual int32_t SpeakerMute(bool& enabled) const;
-    
+    virtual int32_t SpeakerMuteIsAvailable(bool& available) OVERRIDE;
+    virtual int32_t SetSpeakerMute(bool enable) OVERRIDE;
+    virtual int32_t SpeakerMute(bool& enabled) const OVERRIDE;
+
     // Microphone mute control
-    virtual int32_t MicrophoneMuteIsAvailable(bool& available);
-    virtual int32_t SetMicrophoneMute(bool enable);
-    virtual int32_t MicrophoneMute(bool& enabled) const;
+    virtual int32_t MicrophoneMuteIsAvailable(bool& available) OVERRIDE;
+    virtual int32_t SetMicrophoneMute(bool enable) OVERRIDE;
+    virtual int32_t MicrophoneMute(bool& enabled) const OVERRIDE;
 
     // Microphone boost control
-    virtual int32_t MicrophoneBoostIsAvailable(bool& available);
-    virtual int32_t SetMicrophoneBoost(bool enable);
-    virtual int32_t MicrophoneBoost(bool& enabled) const;
+    virtual int32_t MicrophoneBoostIsAvailable(bool& available) OVERRIDE;
+    virtual int32_t SetMicrophoneBoost(bool enable) OVERRIDE;
+    virtual int32_t MicrophoneBoost(bool& enabled) const OVERRIDE;
 
     // Stereo support
-    virtual int32_t StereoPlayoutIsAvailable(bool& available);
-    virtual int32_t SetStereoPlayout(bool enable);
-    virtual int32_t StereoPlayout(bool& enabled) const;
-    virtual int32_t StereoRecordingIsAvailable(bool& available);
-    virtual int32_t SetStereoRecording(bool enable);
-    virtual int32_t StereoRecording(bool& enabled) const;
+    virtual int32_t StereoPlayoutIsAvailable(bool& available) OVERRIDE;
+    virtual int32_t SetStereoPlayout(bool enable) OVERRIDE;
+    virtual int32_t StereoPlayout(bool& enabled) const OVERRIDE;
+    virtual int32_t StereoRecordingIsAvailable(bool& available) OVERRIDE;
+    virtual int32_t SetStereoRecording(bool enable) OVERRIDE;
+    virtual int32_t StereoRecording(bool& enabled) const OVERRIDE;
    
     // Delay information and control
     virtual int32_t SetPlayoutBuffer(
         const AudioDeviceModule::BufferType type,
-        uint16_t sizeMS);
+        uint16_t sizeMS) OVERRIDE;
     virtual int32_t PlayoutBuffer(
         AudioDeviceModule::BufferType& type,
-        uint16_t& sizeMS) const;
-    virtual int32_t PlayoutDelay(uint16_t& delayMS) const;
-    virtual int32_t RecordingDelay(uint16_t& delayMS) const;
+        uint16_t& sizeMS) const OVERRIDE;
+    virtual int32_t PlayoutDelay(uint16_t& delayMS) const OVERRIDE;
+    virtual int32_t RecordingDelay(uint16_t& delayMS) const OVERRIDE;
 
     // CPU load
-    virtual int32_t CPULoad(uint16_t& load) const;
+    virtual int32_t CPULoad(uint16_t& load) const OVERRIDE;
 
 public:
-    virtual bool PlayoutWarning() const;
-    virtual bool PlayoutError() const;
-    virtual bool RecordingWarning() const;
-    virtual bool RecordingError() const;
-    virtual void ClearPlayoutWarning();
-    virtual void ClearPlayoutError();
-    virtual void ClearRecordingWarning();
-    virtual void ClearRecordingError();
+    virtual bool PlayoutWarning() const OVERRIDE;
+    virtual bool PlayoutError() const OVERRIDE;
+    virtual bool RecordingWarning() const OVERRIDE;
+    virtual bool RecordingError() const OVERRIDE;
+    virtual void ClearPlayoutWarning() OVERRIDE;
+    virtual void ClearPlayoutError() OVERRIDE;
+    virtual void ClearRecordingWarning() OVERRIDE;
+    virtual void ClearRecordingError() OVERRIDE;
 
 public:
-    virtual void AttachAudioBuffer(AudioDeviceBuffer* audioBuffer);
+    virtual void AttachAudioBuffer(AudioDeviceBuffer* audioBuffer) OVERRIDE;
 
 private:
     int32_t GetDevicesInfo(const int32_t function,
diff --git a/modules/audio_device/linux/audio_device_pulse_linux.h b/modules/audio_device/linux/audio_device_pulse_linux.h
index 433dc24..c4ca743 100644
--- a/modules/audio_device/linux/audio_device_pulse_linux.h
+++ b/modules/audio_device/linux/audio_device_pulse_linux.h
@@ -93,136 +93,137 @@
 {
 public:
     AudioDeviceLinuxPulse(const int32_t id);
-    ~AudioDeviceLinuxPulse();
+    virtual ~AudioDeviceLinuxPulse();
 
     static bool PulseAudioIsSupported();
 
     // Retrieve the currently utilized audio layer
-    virtual int32_t
-        ActiveAudioLayer(AudioDeviceModule::AudioLayer& audioLayer) const;
+    virtual int32_t ActiveAudioLayer(
+        AudioDeviceModule::AudioLayer& audioLayer) const OVERRIDE;
 
     // Main initializaton and termination
-    virtual int32_t Init();
-    virtual int32_t Terminate();
-    virtual bool Initialized() const;
+    virtual int32_t Init() OVERRIDE;
+    virtual int32_t Terminate() OVERRIDE;
+    virtual bool Initialized() const OVERRIDE;
 
     // Device enumeration
-    virtual int16_t PlayoutDevices();
-    virtual int16_t RecordingDevices();
+    virtual int16_t PlayoutDevices() OVERRIDE;
+    virtual int16_t RecordingDevices() OVERRIDE;
     virtual int32_t PlayoutDeviceName(
         uint16_t index,
         char name[kAdmMaxDeviceNameSize],
-        char guid[kAdmMaxGuidSize]);
+        char guid[kAdmMaxGuidSize]) OVERRIDE;
     virtual int32_t RecordingDeviceName(
         uint16_t index,
         char name[kAdmMaxDeviceNameSize],
-        char guid[kAdmMaxGuidSize]);
+        char guid[kAdmMaxGuidSize]) OVERRIDE;
 
     // Device selection
-    virtual int32_t SetPlayoutDevice(uint16_t index);
+    virtual int32_t SetPlayoutDevice(uint16_t index) OVERRIDE;
     virtual int32_t SetPlayoutDevice(
-        AudioDeviceModule::WindowsDeviceType device);
-    virtual int32_t SetRecordingDevice(uint16_t index);
+        AudioDeviceModule::WindowsDeviceType device) OVERRIDE;
+    virtual int32_t SetRecordingDevice(uint16_t index) OVERRIDE;
     virtual int32_t SetRecordingDevice(
-        AudioDeviceModule::WindowsDeviceType device);
+        AudioDeviceModule::WindowsDeviceType device) OVERRIDE;
 
     // Audio transport initialization
-    virtual int32_t PlayoutIsAvailable(bool& available);
-    virtual int32_t InitPlayout();
-    virtual bool PlayoutIsInitialized() const;
-    virtual int32_t RecordingIsAvailable(bool& available);
-    virtual int32_t InitRecording();
-    virtual bool RecordingIsInitialized() const;
+    virtual int32_t PlayoutIsAvailable(bool& available) OVERRIDE;
+    virtual int32_t InitPlayout() OVERRIDE;
+    virtual bool PlayoutIsInitialized() const OVERRIDE;
+    virtual int32_t RecordingIsAvailable(bool& available) OVERRIDE;
+    virtual int32_t InitRecording() OVERRIDE;
+    virtual bool RecordingIsInitialized() const OVERRIDE;
 
     // Audio transport control
-    virtual int32_t StartPlayout();
-    virtual int32_t StopPlayout();
-    virtual bool Playing() const;
-    virtual int32_t StartRecording();
-    virtual int32_t StopRecording();
-    virtual bool Recording() const;
+    virtual int32_t StartPlayout() OVERRIDE;
+    virtual int32_t StopPlayout() OVERRIDE;
+    virtual bool Playing() const OVERRIDE;
+    virtual int32_t StartRecording() OVERRIDE;
+    virtual int32_t StopRecording() OVERRIDE;
+    virtual bool Recording() const OVERRIDE;
 
     // Microphone Automatic Gain Control (AGC)
-    virtual int32_t SetAGC(bool enable);
-    virtual bool AGC() const;
+    virtual int32_t SetAGC(bool enable) OVERRIDE;
+    virtual bool AGC() const OVERRIDE;
 
     // Volume control based on the Windows Wave API (Windows only)
-    virtual int32_t SetWaveOutVolume(uint16_t volumeLeft, uint16_t volumeRight);
+    virtual int32_t SetWaveOutVolume(uint16_t volumeLeft,
+                                     uint16_t volumeRight) OVERRIDE;
     virtual int32_t WaveOutVolume(uint16_t& volumeLeft,
-                                  uint16_t& volumeRight) const;
+                                  uint16_t& volumeRight) const OVERRIDE;
 
     // Audio mixer initialization
-    virtual int32_t SpeakerIsAvailable(bool& available);
-    virtual int32_t InitSpeaker();
-    virtual bool SpeakerIsInitialized() const;
-    virtual int32_t MicrophoneIsAvailable(bool& available);
-    virtual int32_t InitMicrophone();
-    virtual bool MicrophoneIsInitialized() const;
+    virtual int32_t SpeakerIsAvailable(bool& available) OVERRIDE;
+    virtual int32_t InitSpeaker() OVERRIDE;
+    virtual bool SpeakerIsInitialized() const OVERRIDE;
+    virtual int32_t MicrophoneIsAvailable(bool& available) OVERRIDE;
+    virtual int32_t InitMicrophone() OVERRIDE;
+    virtual bool MicrophoneIsInitialized() const OVERRIDE;
 
     // Speaker volume controls
-    virtual int32_t SpeakerVolumeIsAvailable(bool& available);
-    virtual int32_t SetSpeakerVolume(uint32_t volume);
-    virtual int32_t SpeakerVolume(uint32_t& volume) const;
-    virtual int32_t MaxSpeakerVolume(uint32_t& maxVolume) const;
-    virtual int32_t MinSpeakerVolume(uint32_t& minVolume) const;
-    virtual int32_t SpeakerVolumeStepSize(uint16_t& stepSize) const;
+    virtual int32_t SpeakerVolumeIsAvailable(bool& available) OVERRIDE;
+    virtual int32_t SetSpeakerVolume(uint32_t volume) OVERRIDE;
+    virtual int32_t SpeakerVolume(uint32_t& volume) const OVERRIDE;
+    virtual int32_t MaxSpeakerVolume(uint32_t& maxVolume) const OVERRIDE;
+    virtual int32_t MinSpeakerVolume(uint32_t& minVolume) const OVERRIDE;
+    virtual int32_t SpeakerVolumeStepSize(uint16_t& stepSize) const OVERRIDE;
 
     // Microphone volume controls
-    virtual int32_t MicrophoneVolumeIsAvailable(bool& available);
-    virtual int32_t SetMicrophoneVolume(uint32_t volume);
-    virtual int32_t MicrophoneVolume(uint32_t& volume) const;
-    virtual int32_t MaxMicrophoneVolume(uint32_t& maxVolume) const;
-    virtual int32_t MinMicrophoneVolume(uint32_t& minVolume) const;
+    virtual int32_t MicrophoneVolumeIsAvailable(bool& available) OVERRIDE;
+    virtual int32_t SetMicrophoneVolume(uint32_t volume) OVERRIDE;
+    virtual int32_t MicrophoneVolume(uint32_t& volume) const OVERRIDE;
+    virtual int32_t MaxMicrophoneVolume(uint32_t& maxVolume) const OVERRIDE;
+    virtual int32_t MinMicrophoneVolume(uint32_t& minVolume) const OVERRIDE;
     virtual int32_t MicrophoneVolumeStepSize(
-        uint16_t& stepSize) const;
+        uint16_t& stepSize) const OVERRIDE;
 
     // Speaker mute control
-    virtual int32_t SpeakerMuteIsAvailable(bool& available);
-    virtual int32_t SetSpeakerMute(bool enable);
-    virtual int32_t SpeakerMute(bool& enabled) const;
+    virtual int32_t SpeakerMuteIsAvailable(bool& available) OVERRIDE;
+    virtual int32_t SetSpeakerMute(bool enable) OVERRIDE;
+    virtual int32_t SpeakerMute(bool& enabled) const OVERRIDE;
 
     // Microphone mute control
-    virtual int32_t MicrophoneMuteIsAvailable(bool& available);
-    virtual int32_t SetMicrophoneMute(bool enable);
-    virtual int32_t MicrophoneMute(bool& enabled) const;
+    virtual int32_t MicrophoneMuteIsAvailable(bool& available) OVERRIDE;
+    virtual int32_t SetMicrophoneMute(bool enable) OVERRIDE;
+    virtual int32_t MicrophoneMute(bool& enabled) const OVERRIDE;
 
     // Microphone boost control
-    virtual int32_t MicrophoneBoostIsAvailable(bool& available);
-    virtual int32_t SetMicrophoneBoost(bool enable);
-    virtual int32_t MicrophoneBoost(bool& enabled) const;
+    virtual int32_t MicrophoneBoostIsAvailable(bool& available) OVERRIDE;
+    virtual int32_t SetMicrophoneBoost(bool enable) OVERRIDE;
+    virtual int32_t MicrophoneBoost(bool& enabled) const OVERRIDE;
 
     // Stereo support
-    virtual int32_t StereoPlayoutIsAvailable(bool& available);
-    virtual int32_t SetStereoPlayout(bool enable);
-    virtual int32_t StereoPlayout(bool& enabled) const;
-    virtual int32_t StereoRecordingIsAvailable(bool& available);
-    virtual int32_t SetStereoRecording(bool enable);
-    virtual int32_t StereoRecording(bool& enabled) const;
+    virtual int32_t StereoPlayoutIsAvailable(bool& available) OVERRIDE;
+    virtual int32_t SetStereoPlayout(bool enable) OVERRIDE;
+    virtual int32_t StereoPlayout(bool& enabled) const OVERRIDE;
+    virtual int32_t StereoRecordingIsAvailable(bool& available) OVERRIDE;
+    virtual int32_t SetStereoRecording(bool enable) OVERRIDE;
+    virtual int32_t StereoRecording(bool& enabled) const OVERRIDE;
 
     // Delay information and control
     virtual int32_t
         SetPlayoutBuffer(const AudioDeviceModule::BufferType type,
-                         uint16_t sizeMS);
+                         uint16_t sizeMS) OVERRIDE;
     virtual int32_t PlayoutBuffer(AudioDeviceModule::BufferType& type,
-                                  uint16_t& sizeMS) const;
-    virtual int32_t PlayoutDelay(uint16_t& delayMS) const;
-    virtual int32_t RecordingDelay(uint16_t& delayMS) const;
+                                  uint16_t& sizeMS) const OVERRIDE;
+    virtual int32_t PlayoutDelay(uint16_t& delayMS) const OVERRIDE;
+    virtual int32_t RecordingDelay(uint16_t& delayMS) const OVERRIDE;
 
     // CPU load
-    virtual int32_t CPULoad(uint16_t& load) const;
+    virtual int32_t CPULoad(uint16_t& load) const OVERRIDE;
 
 public:
-    virtual bool PlayoutWarning() const;
-    virtual bool PlayoutError() const;
-    virtual bool RecordingWarning() const;
-    virtual bool RecordingError() const;
-    virtual void ClearPlayoutWarning();
-    virtual void ClearPlayoutError();
-    virtual void ClearRecordingWarning();
-    virtual void ClearRecordingError();
+    virtual bool PlayoutWarning() const OVERRIDE;
+    virtual bool PlayoutError() const OVERRIDE;
+    virtual bool RecordingWarning() const OVERRIDE;
+    virtual bool RecordingError() const OVERRIDE;
+    virtual void ClearPlayoutWarning() OVERRIDE;
+    virtual void ClearPlayoutError() OVERRIDE;
+    virtual void ClearRecordingWarning() OVERRIDE;
+    virtual void ClearRecordingError() OVERRIDE;
 
 public:
-    virtual void AttachAudioBuffer(AudioDeviceBuffer* audioBuffer);
+    virtual void AttachAudioBuffer(AudioDeviceBuffer* audioBuffer) OVERRIDE;
 
 private:
     void Lock()
diff --git a/modules/audio_device/linux/audio_device_utility_linux.h b/modules/audio_device/linux/audio_device_utility_linux.h
index b56023f..0dc2646 100644
--- a/modules/audio_device/linux/audio_device_utility_linux.h
+++ b/modules/audio_device/linux/audio_device_utility_linux.h
@@ -22,9 +22,9 @@
 {
 public:
     AudioDeviceUtilityLinux(const int32_t id);
-    ~AudioDeviceUtilityLinux();
+    virtual ~AudioDeviceUtilityLinux();
 
-    virtual int32_t Init();
+    virtual int32_t Init() OVERRIDE;
 
 private:
     CriticalSectionWrapper& _critSect;