diff --git a/services/audioflinger/AudioFlinger.h b/services/audioflinger/AudioFlinger.h
index 2e0519c..cbaef15 100644
--- a/services/audioflinger/AudioFlinger.h
+++ b/services/audioflinger/AudioFlinger.h
@@ -122,9 +122,6 @@
 #include "Client.h"
 #include "ResamplerBufferProvider.h"
 
-// TODO(b/291319167) remove me when AudioFlinger class not directly used by subcomponents
-namespace android { class AudioFlinger; }
-
 // include AudioFlinger component interfaces
 #include "IAfPatchPanel.h"  // this should be listed before other IAf* interfaces.
 #include "IAfEffect.h"
@@ -167,24 +164,17 @@
     , public IAfDeviceEffectManagerCallback
     , public IAfMelReporterCallback
     , public IAfPatchPanelCallback
+    , public IAfThreadCallback
 {
     friend class sp<AudioFlinger>;
-    // TODO(b/291319167) Create interface and remove friends.
-    // TODO(b/291012167) replace the Thread friends with an interface.
-    friend class DirectOutputThread;
-    friend class MixerThread;
-    friend class MmapPlaybackThread;
-    friend class MmapThread;
-    friend class PlaybackThread;
-    friend class RecordThread;
-    friend class ThreadBase;
-
 public:
     static void instantiate() ANDROID_API;
 
     static AttributionSourceState checkAttributionSourcePackage(
         const AttributionSourceState& attributionSource);
 
+private:
+
     // ---- begin IAudioFlinger interface
 
     status_t dump(int fd, const Vector<String16>& args) final;
@@ -324,7 +314,7 @@
 
     status_t getMmapPolicyInfos(
             media::audio::common::AudioMMapPolicyType policyType,
-            std::vector<media::audio::common::AudioMMapPolicyInfo>* policyInfos) override;
+            std::vector<media::audio::common::AudioMMapPolicyInfo>* policyInfos) final;
 
     int32_t getAAudioMixerBurstCount() const final;
 
@@ -373,6 +363,7 @@
 
     // ---- begin IAfDeviceEffectManagerCallback interface
 
+    // also used by IAfThreadCallback
     bool isAudioPolicyReady() const final { return mAudioPolicyReady.load(); }
     // below also used by IAfMelReporterCallback, IAfPatchPanelCallback
     const sp<PatchCommandThread>& getPatchCommandThread() final { return mPatchCommandThread; }
@@ -385,6 +376,7 @@
 
     // ---- begin IAfMelReporterCallback interface
 
+    // below also used by IAfThreadCallback
     Mutex& mutex() const final { return mLock; }
     sp<IAfThreadBase> checkOutputThread_l(audio_io_handle_t ioHandle) const final REQUIRES(mLock);
 
@@ -425,13 +417,62 @@
 
     // ---- end of IAfPatchPanelCallback interface
 
+    // ----- begin IAfThreadCallback interface
+
+    bool isNonOffloadableGlobalEffectEnabled_l() const final;
+    bool btNrecIsOff() const final { return mBtNrecIsOff.load(); }
+    float masterVolume_l() const final;
+    bool masterMute_l() const final;
+    float getMasterBalance_l() const;
+    // no range check, AudioFlinger::mLock held
+    bool streamMute_l(audio_stream_type_t stream) const final { return mStreamTypes[stream].mute; }
+    audio_mode_t getMode() const final { return mMode; }
+    bool isLowRamDevice() const final { return mIsLowRamDevice; }
+
+    std::optional<media::AudioVibratorInfo> getDefaultVibratorInfo_l() const final;
+    const sp<IAfPatchPanel>& getPatchPanel() const final { return mPatchPanel; }
+    const sp<MelReporter>& getMelReporter() const final { return mMelReporter; }
+    const sp<EffectsFactoryHalInterface>& getEffectsFactoryHal() const final {
+        return mEffectsFactoryHal;
+    }
+    sp<IAudioManager> getOrCreateAudioManager() final;
+
+    // Called when the last effect handle on an effect instance is removed. If this
+    // effect belongs to an effect chain in mOrphanEffectChains, the chain is updated
+    // and removed from mOrphanEffectChains if it does not contain any effect.
+    // Return true if the effect was found in mOrphanEffectChains, false otherwise.
+    bool updateOrphanEffectChains(const sp<IAfEffectModule>& effect) final;
+
+    status_t moveEffectChain_l(audio_session_t sessionId,
+            IAfPlaybackThread* srcThread, IAfPlaybackThread* dstThread) final;
+
+    // This is a helper that is called during incoming binder calls.
+    // Requests media.log to start merging log buffers
+    void requestLogMerge() final;
+    sp<NBLog::Writer> newWriter_l(size_t size, const char *name) final;
+    void unregisterWriter(const sp<NBLog::Writer>& writer) final;
+
+    sp<audioflinger::SyncEvent> createSyncEvent(AudioSystem::sync_event_t type,
+            audio_session_t triggerSession,
+            audio_session_t listenerSession,
+            const audioflinger::SyncEventCallback& callBack,
+            const wp<IAfTrackBase>& cookie) final;
+
+    void ioConfigChanged(audio_io_config_event_t event,
+            const sp<AudioIoDescriptor>& ioDesc,
+            pid_t pid = 0) final;
+    void onNonOffloadableGlobalEffectEnable() final;
+    void onSupportedLatencyModesChanged(
+            audio_io_handle_t output, const std::vector<audio_latency_mode_t>& modes) final;
+
+    // ---- end of IAfThreadCallback interface
+
     /* 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);
     sp<EffectsFactoryHalInterface> getEffectsFactory();
 
+public:
     status_t openMmapStream(MmapStreamInterface::stream_direction_t direction,
                             const audio_attributes_t *attr,
                             audio_config_base_t *config,
@@ -446,8 +487,6 @@
         const sp<os::ExternalVibration>& externalVibration);
     static void onExternalVibrationStop(const sp<os::ExternalVibration>& externalVibration);
 
-    std::optional<media::AudioVibratorInfo> getDefaultVibratorInfo_l();
-
 private:
     // FIXME The 400 is temporarily too high until a leak of writers in media.log is fixed.
     static const size_t kLogMemorySize = 400 * 1024;
@@ -457,38 +496,6 @@
     Vector< sp<NBLog::Writer> > mUnregisteredWriters;
     Mutex               mUnregisteredWritersLock;
 
-public:
-    // Life cycle of gAudioFlinger and AudioFlinger:
-    //
-    // AudioFlinger is created once and survives until audioserver crashes
-    // irrespective of sp<> and wp<> as it is refcounted by ServiceManager and we
-    // don't issue a ServiceManager::tryUnregisterService().
-    //
-    // gAudioFlinger is an atomic pointer set on AudioFlinger::onFirstRef().
-    // After this is set, it is safe to obtain a wp<> or sp<> from it as the
-    // underlying object does not go away.
-    //
-    // Note: For most inner classes, it is acceptable to hold a reference to the outer
-    // AudioFlinger instance as creation requires AudioFlinger to exist in the first place.
-    //
-    // An atomic here ensures underlying writes have completed before setting
-    // the pointer. Access by memory_order_seq_cst.
-    //
-
-    static inline std::atomic<AudioFlinger *> gAudioFlinger = nullptr;
-
-    sp<audioflinger::SyncEvent> createSyncEvent(AudioSystem::sync_event_t type,
-                                        audio_session_t triggerSession,
-                                        audio_session_t listenerSession,
-                                        const audioflinger::SyncEventCallback& callBack,
-                                        const wp<IAfTrackBase>& cookie);
-
-    bool        btNrecIsOff() const { return mBtNrecIsOff.load(); }
-
-private:
-
-               audio_mode_t getMode() const { return mMode; }
-
                             AudioFlinger() ANDROID_API;
     ~AudioFlinger() override;
 
@@ -507,6 +514,10 @@
     // FCC_2 <= channels <= AudioMixer::MAX_NUM_CHANNELS.
     static const bool kEnableExtendedChannels = true;
 
+public:
+    // Remove this when Oboeservice is updated to obtain handle directly.
+    static inline std::atomic<AudioFlinger*> gAudioFlinger = nullptr;
+
     // Returns true if channel mask is permitted for the PCM sink in the MixerThread
     static inline bool isValidPcmSinkChannelMask(audio_channel_mask_t channelMask) {
         switch (audio_channel_mask_get_representation(channelMask)) {
@@ -565,7 +576,7 @@
 
     // Internal dump utilities.
     static const int kDumpLockTimeoutNs = 1 * NANOS_PER_SECOND;
-public:
+
     // TODO(b/291319167) extract to afutils
     static bool dumpTryLock(Mutex& mutex);
 private:
@@ -631,10 +642,6 @@
 
     const sp<MediaLogNotifier> mMediaLogNotifier;
 
-    // This is a helper that is called during incoming binder calls.
-    // Requests media.log to start merging log buffers
-    void requestLogMerge();
-
     // Find io handle by session id.
     // Preference is given to an io handle with a matching effect chain to session id.
     // If none found, AUDIO_IO_HANDLE_NONE is returned.
@@ -665,15 +672,6 @@
     void closeOutputFinish(const sp<IAfPlaybackThread>& thread);
     void closeInputFinish(const sp<IAfRecordThread>& thread);
 
-              // no range check, AudioFlinger::mLock held
-              bool streamMute_l(audio_stream_type_t stream) const
-                                { return mStreamTypes[stream].mute; }
-              void ioConfigChanged(audio_io_config_event_t event,
-                                   const sp<AudioIoDescriptor>& ioDesc,
-                                   pid_t pid = 0);
-              void onSupportedLatencyModesChanged(
-                    audio_io_handle_t output, const std::vector<audio_latency_mode_t>& modes);
-
               // Allocate an audio_unique_id_t.
               // Specific types are audio_io_handle_t, audio_session_t, effect ID (int),
               // audio_module_handle_t, and audio_patch_handle_t.
@@ -685,12 +683,9 @@
               //       Thus it may fail by returning an ID of the wrong sign,
               //       or by returning a non-unique ID.
               // This is the internal API.  For the binder API see newAudioUniqueId().
-    // used by IAfDeviceEffectManagerCallback, IAfPatchPanelCallback
+    // used by IAfDeviceEffectManagerCallback, IAfPatchPanelCallback, IAfThreadCallback
     audio_unique_id_t nextUniqueId(audio_unique_id_use_t use) final;
 
-              status_t moveEffectChain_l(audio_session_t sessionId,
-            IAfPlaybackThread* srcThread, IAfPlaybackThread* dstThread);
-
               // return thread associated with primary hardware device, or NULL
               DeviceTypeSet primaryOutputDevice_l() const;
 
@@ -706,11 +701,6 @@
                       IAfPlaybackThread* thread,
                       const std::vector<audio_io_handle_t>& secondaryOutputs) const;
 
-public:
-    // TODO(b/291319167) cluster together
-                bool isNonOffloadableGlobalEffectEnabled_l();
-private:
-                void onNonOffloadableGlobalEffectEnable();
                 bool isSessionAcquired_l(audio_session_t audioSession);
 
                 // Store an effect chain to mOrphanEffectChains keyed vector.
@@ -724,14 +714,7 @@
                 // Get an effect chain for the specified session in mOrphanEffectChains and remove
                 // it if found. Returns 0 if not found (this is the most common case).
                 sp<IAfEffectChain> getOrphanEffectChain_l(audio_session_t session);
-                // Called when the last effect handle on an effect instance is removed. If this
-                // effect belongs to an effect chain in mOrphanEffectChains, the chain is updated
-                // and removed from mOrphanEffectChains if it does not contain any effect.
-                // Return true if the effect was found in mOrphanEffectChains, false otherwise.
-public:
-// TODO(b/291319167) suggest better grouping
-                bool updateOrphanEffectChains(const sp<IAfEffectModule>& effect);
-private:
+
                 std::vector< sp<IAfEffectModule> > purgeStaleEffects_l();
 
                 void broadcastParametersToRecordThreads_l(const String8& keyValuePairs);
@@ -749,14 +732,11 @@
         int         mCnt;
     };
 
-public:
-    // TODO(b/291319167) access by getter,
     mutable     Mutex                               mLock;
                 // protects mClients and mNotificationClients.
                 // must be locked after mLock and ThreadBase::mLock if both must be locked
                 // avoids acquiring AudioFlinger::mLock from inside thread loop.
 
-private:
     mutable Mutex mClientLock;
 
                 // protected by mClientLock
@@ -828,9 +808,6 @@
                 // protected by mLock
                 Vector<AudioSessionRef*> mAudioSessionRefs;
 
-                float       masterVolume_l() const;
-                float       getMasterBalance_l() const;
-                bool        masterMute_l() const;
                 AudioHwDevice* loadHwModule_l(const char *name);
 
                 // sync events awaiting for a session to be created.
@@ -847,7 +824,6 @@
                 // Audio data transfer is directly handled by the client creating the MMAP stream
     DefaultKeyedVector<audio_io_handle_t, sp<IAfMmapThread>> mMmapThreads;
 
-private:
     sp<Client>  registerPid(pid_t pid);    // always returns non-0
 
     // for use from destructor
@@ -862,15 +838,10 @@
                                       size_t rejectedKVPSize, const String8& rejectedKVPs,
                                       uid_t callingUid);
 
-public:
-    sp<IAudioManager> getOrCreateAudioManager();
-
     // These methods read variables atomically without mLock,
     // though the variables are updated with mLock.
-    bool    isLowRamDevice() const { return mIsLowRamDevice; }
     size_t getClientSharedHeapSize() const;
 
-private:
     std::atomic<bool> mIsLowRamDevice;
     bool    mIsDeviceTypeKnown;
     int64_t mTotalMemory;
@@ -881,10 +852,7 @@
 
     /* const */ sp<IAfPatchPanel> mPatchPanel;
 
-public:
-    // TODO(b/291319167) access by getter.
     sp<EffectsFactoryHalInterface> mEffectsFactoryHal;
-private:
 
     const sp<PatchCommandThread> mPatchCommandThread;
     /* const */ sp<DeviceEffectManager> mDeviceEffectManager;  // set onFirstRef
@@ -903,8 +871,10 @@
 
     static inline constexpr const char *mMetricsId = AMEDIAMETRICS_KEY_AUDIO_FLINGER;
 
+public:
     // Keep in sync with java definition in media/java/android/media/AudioRecord.java
     static constexpr int32_t kMaxSharedAudioHistoryMs = 5000;
+private:
 
     std::map<media::audio::common::AudioMMapPolicyType,
              std::vector<media::audio::common::AudioMMapPolicyInfo>> mPolicyInfos;