diff --git a/media/libaudioclient/IAudioFlinger.cpp b/media/libaudioclient/IAudioFlinger.cpp
index 7caaaaf..4bd12b8 100644
--- a/media/libaudioclient/IAudioFlinger.cpp
+++ b/media/libaudioclient/IAudioFlinger.cpp
@@ -646,7 +646,7 @@
     return result.value_or(0);
 }
 
-uint32_t AudioFlingerClientAdapter::getPrimaryOutputSamplingRate() {
+uint32_t AudioFlingerClientAdapter::getPrimaryOutputSamplingRate() const {
     auto result = [&]() -> ConversionResult<uint32_t> {
         int32_t aidlRet;
         RETURN_IF_ERROR(statusTFromBinderStatus(
@@ -657,7 +657,7 @@
     return result.value_or(0);
 }
 
-size_t AudioFlingerClientAdapter::getPrimaryOutputFrameCount() {
+size_t AudioFlingerClientAdapter::getPrimaryOutputFrameCount() const {
     auto result = [&]() -> ConversionResult<size_t> {
         int64_t aidlRet;
         RETURN_IF_ERROR(statusTFromBinderStatus(
@@ -672,7 +672,7 @@
     return statusTFromBinderStatus(mDelegate->setLowRamDevice(isLowRamDevice, totalMemory));
 }
 
-status_t AudioFlingerClientAdapter::getAudioPort(struct audio_port_v7* port) {
+status_t AudioFlingerClientAdapter::getAudioPort(struct audio_port_v7* port) const {
     media::AudioPortFw portAidl = VALUE_OR_RETURN_STATUS(
             legacy2aidl_audio_port_v7_AudioPortFw(*port));
     media::AudioPortFw aidlRet;
@@ -705,7 +705,7 @@
 }
 
 status_t AudioFlingerClientAdapter::listAudioPatches(unsigned int* num_patches,
-                                                     struct audio_patch* patches) {
+                                                     struct audio_patch* patches) const {
     std::vector<media::AudioPatchFw> aidlRet;
     int32_t maxPatches = VALUE_OR_RETURN_STATUS(convertIntegral<int32_t>(*num_patches));
     RETURN_STATUS_IF_ERROR(statusTFromBinderStatus(
@@ -753,7 +753,8 @@
 }
 
 status_t
-AudioFlingerClientAdapter::getMicrophones(std::vector<media::MicrophoneInfoFw>* microphones) {
+AudioFlingerClientAdapter::getMicrophones(
+        std::vector<media::MicrophoneInfoFw>* microphones) const {
     std::vector<media::MicrophoneInfoFw> aidlRet;
     RETURN_STATUS_IF_ERROR(statusTFromBinderStatus(mDelegate->getMicrophones(&aidlRet)));
     if (microphones != nullptr) {
@@ -788,7 +789,7 @@
     return statusTFromBinderStatus(mDelegate->getMmapPolicyInfos(policyType, policyInfos));
 }
 
-int32_t AudioFlingerClientAdapter::getAAudioMixerBurstCount() {
+int32_t AudioFlingerClientAdapter::getAAudioMixerBurstCount() const {
     auto result = [&]() -> ConversionResult<int32_t> {
         int32_t aidlRet;
         RETURN_IF_ERROR(statusTFromBinderStatus(mDelegate->getAAudioMixerBurstCount(&aidlRet)));
@@ -798,7 +799,7 @@
     return result.value_or(0);
 }
 
-int32_t AudioFlingerClientAdapter::getAAudioHardwareBurstMinUsec() {
+int32_t AudioFlingerClientAdapter::getAAudioHardwareBurstMinUsec() const {
     auto result = [&]() -> ConversionResult<int32_t> {
         int32_t aidlRet;
         RETURN_IF_ERROR(statusTFromBinderStatus(
@@ -829,7 +830,7 @@
 }
 
 status_t AudioFlingerClientAdapter::getSupportedLatencyModes(
-        audio_io_handle_t output, std::vector<audio_latency_mode_t>* modes) {
+        audio_io_handle_t output, std::vector<audio_latency_mode_t>* modes) const {
     if (modes == nullptr) {
         return BAD_VALUE;
     }
@@ -851,7 +852,7 @@
     return statusTFromBinderStatus(mDelegate->setBluetoothVariableLatencyEnabled(enabled));
 }
 
-status_t AudioFlingerClientAdapter::isBluetoothVariableLatencyEnabled(bool* enabled) {
+status_t AudioFlingerClientAdapter::isBluetoothVariableLatencyEnabled(bool* enabled) const {
     if (enabled == nullptr) {
         return BAD_VALUE;
     }
@@ -862,7 +863,7 @@
     return NO_ERROR;
 }
 
-status_t AudioFlingerClientAdapter::supportsBluetoothVariableLatency(bool* support) {
+status_t AudioFlingerClientAdapter::supportsBluetoothVariableLatency(bool* support) const {
     if (support == nullptr) {
         return BAD_VALUE;
     }
@@ -875,7 +876,7 @@
 
 status_t AudioFlingerClientAdapter::getSoundDoseInterface(
         const sp<media::ISoundDoseCallback> &callback,
-        sp<media::ISoundDose>* soundDose) {
+        sp<media::ISoundDose>* soundDose) const {
     return statusTFromBinderStatus(mDelegate->getSoundDoseInterface(callback, soundDose));
 }
 
diff --git a/media/libaudioclient/include/media/IAudioFlinger.h b/media/libaudioclient/include/media/IAudioFlinger.h
index 2e2ef65..3c96862 100644
--- a/media/libaudioclient/include/media/IAudioFlinger.h
+++ b/media/libaudioclient/include/media/IAudioFlinger.h
@@ -303,8 +303,8 @@
     // helpers for android.media.AudioManager.getProperty(), see description there for meaning
     // FIXME move these APIs to AudioPolicy to permit a more accurate implementation
     // that looks on primary device for a stream with fast flag, primary flag, or first one.
-    virtual uint32_t getPrimaryOutputSamplingRate() = 0;
-    virtual size_t getPrimaryOutputFrameCount() = 0;
+    virtual uint32_t getPrimaryOutputSamplingRate() const = 0;
+    virtual size_t getPrimaryOutputFrameCount() const = 0;
 
     // Intended for AudioService to inform AudioFlinger of device's low RAM attribute,
     // and should be called at most once.  For a definition of what "low RAM" means, see
@@ -313,7 +313,7 @@
     virtual status_t setLowRamDevice(bool isLowRamDevice, int64_t totalMemory) = 0;
 
     /* Get attributes for a given audio port */
-    virtual status_t getAudioPort(struct audio_port_v7 *port) = 0;
+    virtual status_t getAudioPort(struct audio_port_v7* port) const = 0;
 
     /* Create an audio patch between several source and sink ports */
     virtual status_t createAudioPatch(const struct audio_patch *patch,
@@ -324,7 +324,7 @@
 
     /* List existing audio patches */
     virtual status_t listAudioPatches(unsigned int *num_patches,
-                                      struct audio_patch *patches) = 0;
+                                      struct audio_patch* patches) const = 0;
     /* Set audio port configuration */
     virtual status_t setAudioPortConfig(const struct audio_port_config *config) = 0;
 
@@ -341,7 +341,7 @@
     virtual size_t frameCountHAL(audio_io_handle_t ioHandle) const = 0;
 
     /* List available microphones and their characteristics */
-    virtual status_t getMicrophones(std::vector<media::MicrophoneInfoFw> *microphones) = 0;
+    virtual status_t getMicrophones(std::vector<media::MicrophoneInfoFw>* microphones) const = 0;
 
     virtual status_t setAudioHalPids(const std::vector<pid_t>& pids) = 0;
 
@@ -357,9 +357,9 @@
             media::audio::common::AudioMMapPolicyType policyType,
             std::vector<media::audio::common::AudioMMapPolicyInfo> *policyInfos) = 0;
 
-    virtual int32_t getAAudioMixerBurstCount() = 0;
+    virtual int32_t getAAudioMixerBurstCount() const = 0;
 
-    virtual int32_t getAAudioHardwareBurstMinUsec() = 0;
+    virtual int32_t getAAudioHardwareBurstMinUsec() const = 0;
 
     virtual status_t setDeviceConnectedState(const struct audio_port_v7 *port,
                                              media::DeviceConnectedState state) = 0;
@@ -370,18 +370,18 @@
             audio_io_handle_t output, audio_latency_mode_t mode) = 0;
 
     virtual status_t getSupportedLatencyModes(audio_io_handle_t output,
-            std::vector<audio_latency_mode_t>* modes) = 0;
+            std::vector<audio_latency_mode_t>* modes) const = 0;
 
     virtual status_t getSoundDoseInterface(const sp<media::ISoundDoseCallback>& callback,
-                                           sp<media::ISoundDose>* soundDose) = 0;
+                                           sp<media::ISoundDose>* soundDose) const = 0;
 
     virtual status_t invalidateTracks(const std::vector<audio_port_handle_t>& portIds) = 0;
 
     virtual status_t setBluetoothVariableLatencyEnabled(bool enabled) = 0;
 
-    virtual status_t isBluetoothVariableLatencyEnabled(bool* enabled) = 0;
+    virtual status_t isBluetoothVariableLatencyEnabled(bool* enabled) const = 0;
 
-    virtual status_t supportsBluetoothVariableLatency(bool* support) = 0;
+    virtual status_t supportsBluetoothVariableLatency(bool* support) const = 0;
 
     virtual status_t getAudioPolicyConfig(media::AudioPolicyConfig* output) = 0;
 };
@@ -459,22 +459,22 @@
                             audio_session_t sessionId,
                             bool suspended) override;
     audio_module_handle_t loadHwModule(const char* name) override;
-    uint32_t getPrimaryOutputSamplingRate() override;
-    size_t getPrimaryOutputFrameCount() override;
+    uint32_t getPrimaryOutputSamplingRate() const override;
+    size_t getPrimaryOutputFrameCount() const override;
     status_t setLowRamDevice(bool isLowRamDevice, int64_t totalMemory) override;
-    status_t getAudioPort(struct audio_port_v7* port) override;
+    status_t getAudioPort(struct audio_port_v7* port) const override;
     status_t createAudioPatch(const struct audio_patch* patch,
                               audio_patch_handle_t* handle) override;
     status_t releaseAudioPatch(audio_patch_handle_t handle) override;
     status_t listAudioPatches(unsigned int* num_patches,
-                              struct audio_patch* patches) override;
+                              struct audio_patch* patches) const override;
     status_t setAudioPortConfig(const struct audio_port_config* config) override;
     audio_hw_sync_t getAudioHwSyncForSession(audio_session_t sessionId) override;
     status_t systemReady() override;
     status_t audioPolicyReady() override;
 
     size_t frameCountHAL(audio_io_handle_t ioHandle) const override;
-    status_t getMicrophones(std::vector<media::MicrophoneInfoFw>* microphones) override;
+    status_t getMicrophones(std::vector<media::MicrophoneInfoFw>* microphones) const override;
     status_t setAudioHalPids(const std::vector<pid_t>& pids) override;
     status_t setVibratorInfos(const std::vector<media::AudioVibratorInfo>& vibratorInfos) override;
     status_t updateSecondaryOutputs(
@@ -482,20 +482,20 @@
     status_t getMmapPolicyInfos(
             media::audio::common::AudioMMapPolicyType policyType,
             std::vector<media::audio::common::AudioMMapPolicyInfo> *policyInfos) override;
-    int32_t getAAudioMixerBurstCount() override;
-    int32_t getAAudioHardwareBurstMinUsec() override;
+    int32_t getAAudioMixerBurstCount() const override;
+    int32_t getAAudioHardwareBurstMinUsec() const override;
     status_t setDeviceConnectedState(const struct audio_port_v7 *port,
                                      media::DeviceConnectedState state) override;
     status_t setSimulateDeviceConnections(bool enabled) override;
     status_t setRequestedLatencyMode(audio_io_handle_t output,
             audio_latency_mode_t mode) override;
     status_t getSupportedLatencyModes(
-            audio_io_handle_t output, std::vector<audio_latency_mode_t>* modes) override;
+            audio_io_handle_t output, std::vector<audio_latency_mode_t>* modes) const override;
     status_t setBluetoothVariableLatencyEnabled(bool enabled) override;
-    status_t isBluetoothVariableLatencyEnabled(bool* enabled) override;
-    status_t supportsBluetoothVariableLatency(bool* support) override;
+    status_t isBluetoothVariableLatencyEnabled(bool* enabled) const override;
+    status_t supportsBluetoothVariableLatency(bool* support) const override;
     status_t getSoundDoseInterface(const sp<media::ISoundDoseCallback>& callback,
-                                   sp<media::ISoundDose>* soundDose) override;
+                                   sp<media::ISoundDose>* soundDose) const override;
     status_t invalidateTracks(const std::vector<audio_port_handle_t>& portIds) override;
     status_t getAudioPolicyConfig(media::AudioPolicyConfig* output) override;
 
diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index 5929969..05f1aa8 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -475,12 +475,12 @@
     return NO_ERROR;
 }
 
-int32_t AudioFlinger::getAAudioMixerBurstCount() {
+int32_t AudioFlinger::getAAudioMixerBurstCount() const {
     Mutex::Autolock _l(mLock);
     return mAAudioBurstsPerBuffer;
 }
 
-int32_t AudioFlinger::getAAudioHardwareBurstMinUsec() {
+int32_t AudioFlinger::getAAudioHardwareBurstMinUsec() const {
     Mutex::Autolock _l(mLock);
     return mAAudioHwBurstMinMicros;
 }
@@ -1683,7 +1683,7 @@
 }
 
 status_t AudioFlinger::getSupportedLatencyModes(audio_io_handle_t output,
-            std::vector<audio_latency_mode_t>* modes) {
+            std::vector<audio_latency_mode_t>* modes) const {
     if (output == AUDIO_IO_HANDLE_NONE) {
         return BAD_VALUE;
     }
@@ -1710,7 +1710,7 @@
     return status;
 }
 
-status_t AudioFlinger::isBluetoothVariableLatencyEnabled(bool *enabled) {
+status_t AudioFlinger::isBluetoothVariableLatencyEnabled(bool* enabled) const {
     if (enabled == nullptr) {
         return BAD_VALUE;
     }
@@ -1718,7 +1718,7 @@
     return NO_ERROR;
 }
 
-status_t AudioFlinger::supportsBluetoothVariableLatency(bool* support) {
+status_t AudioFlinger::supportsBluetoothVariableLatency(bool* support) const {
     if (support == nullptr) {
         return BAD_VALUE;
     }
@@ -1734,7 +1734,7 @@
 }
 
 status_t AudioFlinger::getSoundDoseInterface(const sp<media::ISoundDoseCallback>& callback,
-                                             sp<media::ISoundDose>* soundDose) {
+                                             sp<media::ISoundDose>* soundDose) const {
     if (soundDose == nullptr) {
         return BAD_VALUE;
     }
@@ -2738,14 +2738,14 @@
 
 // ----------------------------------------------------------------------------
 
-uint32_t AudioFlinger::getPrimaryOutputSamplingRate()
+uint32_t AudioFlinger::getPrimaryOutputSamplingRate() const
 {
     Mutex::Autolock _l(mLock);
     IAfPlaybackThread* const thread = fastPlaybackThread_l();
     return thread != NULL ? thread->sampleRate() : 0;
 }
 
-size_t AudioFlinger::getPrimaryOutputFrameCount()
+size_t AudioFlinger::getPrimaryOutputFrameCount() const
 {
     Mutex::Autolock _l(mLock);
     IAfPlaybackThread* const thread = fastPlaybackThread_l();
@@ -2933,7 +2933,7 @@
     return mAudioManager.load();
 }
 
-status_t AudioFlinger::getMicrophones(std::vector<media::MicrophoneInfoFw> *microphones)
+status_t AudioFlinger::getMicrophones(std::vector<media::MicrophoneInfoFw>* microphones) const
 {
     AutoMutex lock(mHardwareLock);
     status_t status = INVALID_OPERATION;
diff --git a/services/audioflinger/AudioFlinger.h b/services/audioflinger/AudioFlinger.h
index e3910ea..d38e223 100644
--- a/services/audioflinger/AudioFlinger.h
+++ b/services/audioflinger/AudioFlinger.h
@@ -159,7 +159,8 @@
     bool mute = false;
 };
 
-class AudioFlinger : public AudioFlingerServerAdapter::Delegate
+class AudioFlinger
+    : public AudioFlingerServerAdapter::Delegate  // IAudioFlinger client interface
 {
     friend class sp<AudioFlinger>;
     // TODO(b/291319167) Create interface and remove friends.
@@ -183,186 +184,184 @@
     static AttributionSourceState checkAttributionSourcePackage(
         const AttributionSourceState& attributionSource);
 
-    status_t dump(int fd, const Vector<String16>& args) override;
+    // ---- begin IAudioFlinger interface
 
-    // IAudioFlinger interface, in binder opcode order
+    status_t dump(int fd, const Vector<String16>& args) final;
+
     status_t createTrack(const media::CreateTrackRequest& input,
-                         media::CreateTrackResponse& output) override;
+                         media::CreateTrackResponse& output) final;
 
     status_t createRecord(const media::CreateRecordRequest& input,
-                          media::CreateRecordResponse& output) override;
+                          media::CreateRecordResponse& output) final;
 
-    virtual     uint32_t    sampleRate(audio_io_handle_t ioHandle) const;
-    virtual     audio_format_t format(audio_io_handle_t output) const;
-    virtual     size_t      frameCount(audio_io_handle_t ioHandle) const;
-    virtual     size_t      frameCountHAL(audio_io_handle_t ioHandle) const;
-    virtual     uint32_t    latency(audio_io_handle_t output) const;
+    uint32_t sampleRate(audio_io_handle_t ioHandle) const final;
+    audio_format_t format(audio_io_handle_t output) const final;
+    size_t frameCount(audio_io_handle_t ioHandle) const final;
+    size_t frameCountHAL(audio_io_handle_t ioHandle) const final;
+    uint32_t latency(audio_io_handle_t output) const final;
 
-    virtual     status_t    setMasterVolume(float value);
-    virtual     status_t    setMasterMute(bool muted);
-
-    virtual     float       masterVolume() const;
-    virtual     bool        masterMute() const;
+    status_t setMasterVolume(float value) final;
+    status_t setMasterMute(bool muted) final;
+    float masterVolume() const final;
+    bool masterMute() const final;
 
     // Balance value must be within -1.f (left only) to 1.f (right only) inclusive.
-                status_t    setMasterBalance(float balance) override;
-                status_t    getMasterBalance(float *balance) const override;
+    status_t setMasterBalance(float balance) final;
+    status_t getMasterBalance(float* balance) const final;
 
-    virtual     status_t    setStreamVolume(audio_stream_type_t stream, float value,
-                                            audio_io_handle_t output);
-    virtual     status_t    setStreamMute(audio_stream_type_t stream, bool muted);
+    status_t setStreamVolume(audio_stream_type_t stream, float value,
+            audio_io_handle_t output) final;
+    status_t setStreamMute(audio_stream_type_t stream, bool muted) final;
 
-    virtual     float       streamVolume(audio_stream_type_t stream,
-                                         audio_io_handle_t output) const;
-    virtual     bool        streamMute(audio_stream_type_t stream) const;
+    float streamVolume(audio_stream_type_t stream,
+            audio_io_handle_t output) const final;
+    bool streamMute(audio_stream_type_t stream) const final;
 
-    virtual     status_t    setMode(audio_mode_t mode);
+    status_t setMode(audio_mode_t mode) final;
 
-    virtual     status_t    setMicMute(bool state);
-    virtual     bool        getMicMute() const;
+    status_t setMicMute(bool state) final;
+    bool getMicMute() const final;
 
-    virtual     void        setRecordSilenced(audio_port_handle_t portId, bool silenced);
+    void setRecordSilenced(audio_port_handle_t portId, bool silenced) final;
 
-    virtual     status_t    setParameters(audio_io_handle_t ioHandle, const String8& keyValuePairs);
-    virtual     String8     getParameters(audio_io_handle_t ioHandle, const String8& keys) const;
+    status_t setParameters(audio_io_handle_t ioHandle, const String8& keyValuePairs) final;
+    String8 getParameters(audio_io_handle_t ioHandle, const String8& keys) const final;
 
-    virtual     void        registerClient(const sp<media::IAudioFlingerClient>& client);
+    void registerClient(const sp<media::IAudioFlingerClient>& client) final;
+    size_t getInputBufferSize(uint32_t sampleRate, audio_format_t format,
+            audio_channel_mask_t channelMask) const final;
 
-    virtual     size_t      getInputBufferSize(uint32_t sampleRate, audio_format_t format,
-                                               audio_channel_mask_t channelMask) const;
+    status_t openOutput(const media::OpenOutputRequest& request,
+            media::OpenOutputResponse* response) final;
 
-    virtual status_t openOutput(const media::OpenOutputRequest& request,
-                                media::OpenOutputResponse* response);
+    audio_io_handle_t openDuplicateOutput(audio_io_handle_t output1,
+            audio_io_handle_t output2) final;
 
-    virtual audio_io_handle_t openDuplicateOutput(audio_io_handle_t output1,
-                                                  audio_io_handle_t output2);
+    status_t closeOutput(audio_io_handle_t output) final;
 
-    virtual status_t closeOutput(audio_io_handle_t output);
+    status_t suspendOutput(audio_io_handle_t output) final;
 
-    virtual status_t suspendOutput(audio_io_handle_t output);
+    status_t restoreOutput(audio_io_handle_t output) final;
 
-    virtual status_t restoreOutput(audio_io_handle_t output);
+    status_t openInput(const media::OpenInputRequest& request,
+            media::OpenInputResponse* response) final;
 
-    virtual status_t openInput(const media::OpenInputRequest& request,
-                               media::OpenInputResponse* response);
+    status_t closeInput(audio_io_handle_t input) final;
 
-    virtual status_t closeInput(audio_io_handle_t input);
+    status_t setVoiceVolume(float volume) final;
 
-    virtual status_t setVoiceVolume(float volume);
+    status_t getRenderPosition(uint32_t* halFrames, uint32_t* dspFrames,
+            audio_io_handle_t output) const final;
 
-    virtual status_t getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames,
-                                       audio_io_handle_t output) const;
-
-    virtual uint32_t getInputFramesLost(audio_io_handle_t ioHandle) const;
+    uint32_t getInputFramesLost(audio_io_handle_t ioHandle) const final;
 
     // This is the binder API.  For the internal API see nextUniqueId().
-    virtual audio_unique_id_t newAudioUniqueId(audio_unique_id_use_t use);
+    audio_unique_id_t newAudioUniqueId(audio_unique_id_use_t use) final;
 
-    void acquireAudioSessionId(audio_session_t audioSession, pid_t pid, uid_t uid) override;
+    void acquireAudioSessionId(audio_session_t audioSession, pid_t pid, uid_t uid) final;
 
-    virtual void releaseAudioSessionId(audio_session_t audioSession, pid_t pid);
+    void releaseAudioSessionId(audio_session_t audioSession, pid_t pid) final;
 
-    virtual status_t queryNumberEffects(uint32_t *numEffects) const;
+    status_t queryNumberEffects(uint32_t* numEffects) const final;
 
-    virtual status_t queryEffect(uint32_t index, effect_descriptor_t *descriptor) const;
+    status_t queryEffect(uint32_t index, effect_descriptor_t* descriptor) const final;
 
-    virtual status_t getEffectDescriptor(const effect_uuid_t *pUuid,
-                                         const effect_uuid_t *pTypeUuid,
-                                         uint32_t preferredTypeFlag,
-                                         effect_descriptor_t *descriptor) const;
+    status_t getEffectDescriptor(const effect_uuid_t* pUuid,
+            const effect_uuid_t* pTypeUuid,
+            uint32_t preferredTypeFlag,
+            effect_descriptor_t* descriptor) const final;
 
-    virtual status_t createEffect(const media::CreateEffectRequest& request,
-                                  media::CreateEffectResponse* response);
+    status_t createEffect(const media::CreateEffectRequest& request,
+            media::CreateEffectResponse* response) final;
 
-    virtual status_t moveEffects(audio_session_t sessionId, audio_io_handle_t srcOutput,
-                        audio_io_handle_t dstOutput);
+    status_t moveEffects(audio_session_t sessionId, audio_io_handle_t srcOutput,
+            audio_io_handle_t dstOutput) final;
 
-            void setEffectSuspended(int effectId,
-                                    audio_session_t sessionId,
-                                    bool suspended) override;
+    void setEffectSuspended(int effectId,
+            audio_session_t sessionId,
+            bool suspended) final;
 
-    virtual audio_module_handle_t loadHwModule(const char *name);
+    audio_module_handle_t loadHwModule(const char* name) final;
 
-    virtual uint32_t getPrimaryOutputSamplingRate();
-    virtual size_t getPrimaryOutputFrameCount();
+    uint32_t getPrimaryOutputSamplingRate() const final;
+    size_t getPrimaryOutputFrameCount() const final;
 
-    virtual status_t setLowRamDevice(bool isLowRamDevice, int64_t totalMemory) override;
-
-    /* List available audio ports and their attributes */
-    virtual status_t listAudioPorts(unsigned int *num_ports,
-                                    struct audio_port *ports);
+    status_t setLowRamDevice(bool isLowRamDevice, int64_t totalMemory) final;
 
     /* Get attributes for a given audio port */
-    virtual status_t getAudioPort(struct audio_port_v7 *port);
+    status_t getAudioPort(struct audio_port_v7* port) const final;
 
     /* Create an audio patch between several source and sink ports */
-    virtual status_t createAudioPatch(const struct audio_patch *patch,
-                                       audio_patch_handle_t *handle);
+    status_t createAudioPatch(const struct audio_patch *patch,
+            audio_patch_handle_t* handle) final;
 
     /* Release an audio patch */
-    virtual status_t releaseAudioPatch(audio_patch_handle_t handle);
+    status_t releaseAudioPatch(audio_patch_handle_t handle) final;
 
     /* List existing audio patches */
-    virtual status_t listAudioPatches(unsigned int *num_patches,
-                                      struct audio_patch *patches);
+    status_t listAudioPatches(unsigned int* num_patches,
+            struct audio_patch* patches) const final;
 
     /* Set audio port configuration */
-    virtual status_t setAudioPortConfig(const struct audio_port_config *config);
+    status_t setAudioPortConfig(const struct audio_port_config* config) final;
 
     /* Get the HW synchronization source used for an audio session */
-    virtual audio_hw_sync_t getAudioHwSyncForSession(audio_session_t sessionId);
+    audio_hw_sync_t getAudioHwSyncForSession(audio_session_t sessionId) final;
 
     /* Indicate JAVA services are ready (scheduling, power management ...) */
-    virtual status_t systemReady();
-    virtual status_t audioPolicyReady() { mAudioPolicyReady.store(true); return NO_ERROR; }
-            bool isAudioPolicyReady() const { return mAudioPolicyReady.load(); }
+    status_t systemReady() final;
+    status_t audioPolicyReady() final { mAudioPolicyReady.store(true); return NO_ERROR; }
 
+    status_t getMicrophones(std::vector<media::MicrophoneInfoFw>* microphones) const final;
 
-    virtual status_t getMicrophones(std::vector<media::MicrophoneInfoFw> *microphones);
+    status_t setAudioHalPids(const std::vector<pid_t>& pids) final;
 
-    virtual status_t setAudioHalPids(const std::vector<pid_t>& pids);
+    status_t setVibratorInfos(const std::vector<media::AudioVibratorInfo>& vibratorInfos) final;
 
-    virtual status_t setVibratorInfos(const std::vector<media::AudioVibratorInfo>& vibratorInfos);
+    status_t updateSecondaryOutputs(
+            const TrackSecondaryOutputsMap& trackSecondaryOutputs) final;
 
-    virtual status_t updateSecondaryOutputs(
-            const TrackSecondaryOutputsMap& trackSecondaryOutputs);
-
-    virtual status_t getMmapPolicyInfos(
+    status_t getMmapPolicyInfos(
             media::audio::common::AudioMMapPolicyType policyType,
-            std::vector<media::audio::common::AudioMMapPolicyInfo> *policyInfos);
+            std::vector<media::audio::common::AudioMMapPolicyInfo>* policyInfos) final;
 
-    virtual int32_t getAAudioMixerBurstCount();
+    int32_t getAAudioMixerBurstCount() const final;
 
-    virtual int32_t getAAudioHardwareBurstMinUsec();
+    int32_t getAAudioHardwareBurstMinUsec() const final;
 
-    virtual status_t setDeviceConnectedState(const struct audio_port_v7 *port,
-                                             media::DeviceConnectedState state);
+    status_t setDeviceConnectedState(const struct audio_port_v7* port,
+            media::DeviceConnectedState state) final;
 
-    virtual status_t setSimulateDeviceConnections(bool enabled);
+    status_t setSimulateDeviceConnections(bool enabled) final;
 
-    virtual status_t setRequestedLatencyMode(
-            audio_io_handle_t output, audio_latency_mode_t mode);
+    status_t setRequestedLatencyMode(
+            audio_io_handle_t output, audio_latency_mode_t mode) final;
 
-    virtual status_t getSupportedLatencyModes(audio_io_handle_t output,
-            std::vector<audio_latency_mode_t>* modes);
+    status_t getSupportedLatencyModes(audio_io_handle_t output,
+            std::vector<audio_latency_mode_t>* modes) const final;
 
-    virtual status_t setBluetoothVariableLatencyEnabled(bool enabled);
+    status_t setBluetoothVariableLatencyEnabled(bool enabled) final;
 
-    virtual status_t isBluetoothVariableLatencyEnabled(bool* enabled);
+    status_t isBluetoothVariableLatencyEnabled(bool* enabled) const final;
 
-    virtual status_t supportsBluetoothVariableLatency(bool* support);
+    status_t supportsBluetoothVariableLatency(bool* support) const final;
 
-    virtual status_t getSoundDoseInterface(const sp<media::ISoundDoseCallback>& callback,
-                                           sp<media::ISoundDose>* soundDose);
+    status_t getSoundDoseInterface(const sp<media::ISoundDoseCallback>& callback,
+            sp<media::ISoundDose>* soundDose) const final;
 
-    status_t invalidateTracks(const std::vector<audio_port_handle_t>& portIds) override;
+    status_t invalidateTracks(const std::vector<audio_port_handle_t>& portIds) final;
 
-    virtual status_t getAudioPolicyConfig(media::AudioPolicyConfig* config);
+    status_t getAudioPolicyConfig(media::AudioPolicyConfig* config) final;
 
     status_t onTransactWrapper(TransactionCode code, const Parcel& data, uint32_t flags,
-        const std::function<status_t()>& delegate) override;
+            const std::function<status_t()>& delegate) final;
 
-    // end of IAudioFlinger interface
+    // ---- end of IAudioFlinger interface
+
+    bool isAudioPolicyReady() const { return mAudioPolicyReady.load(); }
+
+    /* List available audio ports and their attributes */
+    status_t listAudioPorts(unsigned int* num_ports, struct audio_port* ports) const;
 
     sp<NBLog::Writer>   newWriter_l(size_t size, const char *name);
     void                unregisterWriter(const sp<NBLog::Writer>& writer);
@@ -437,14 +436,14 @@
                audio_mode_t getMode() const { return mMode; }
 
                             AudioFlinger() ANDROID_API;
-    virtual                 ~AudioFlinger();
+    ~AudioFlinger() override;
 
     // call in any IAudioFlinger method that accesses mPrimaryHardwareDev
     status_t                initCheck() const { return mPrimaryHardwareDev == NULL ?
                                                         NO_INIT : NO_ERROR; }
 
     // RefBase
-    virtual     void        onFirstRef();
+    void onFirstRef() override;
 
     AudioHwDevice*          findSuitableHwDev_l(audio_module_handle_t module,
                                                 audio_devices_t deviceType);
diff --git a/services/audioflinger/PatchPanel.cpp b/services/audioflinger/PatchPanel.cpp
index bede225..12ac63c 100644
--- a/services/audioflinger/PatchPanel.cpp
+++ b/services/audioflinger/PatchPanel.cpp
@@ -50,14 +50,14 @@
 
 /* List connected audio ports and their attributes */
 status_t AudioFlinger::listAudioPorts(unsigned int *num_ports,
-                                struct audio_port *ports)
+        struct audio_port* ports) const
 {
     Mutex::Autolock _l(mLock);
     return mPatchPanel->listAudioPorts(num_ports, ports);
 }
 
 /* Get supported attributes for a given audio port */
-status_t AudioFlinger::getAudioPort(struct audio_port_v7 *port) {
+status_t AudioFlinger::getAudioPort(struct audio_port_v7* port) const {
     status_t status = AudioValidator::validateAudioPort(*port);
     if (status != NO_ERROR) {
         return status;
@@ -88,8 +88,8 @@
 }
 
 /* List connected audio ports and they attributes */
-status_t AudioFlinger::listAudioPatches(unsigned int *num_patches,
-                                  struct audio_patch *patches)
+status_t AudioFlinger::listAudioPatches(
+        unsigned int* num_patches, struct audio_patch* patches) const
 {
     Mutex::Autolock _l(mLock);
     return mPatchPanel->listAudioPatches(num_patches, patches);