diff --git a/services/audioflinger/AudioFlinger.h b/services/audioflinger/AudioFlinger.h
index 2624447..9d96035 100644
--- a/services/audioflinger/AudioFlinger.h
+++ b/services/audioflinger/AudioFlinger.h
@@ -166,10 +166,10 @@
     : public AudioFlingerServerAdapter::Delegate  // IAudioFlinger client interface
     , public IAfClientCallback
     , public IAfDeviceEffectManagerCallback
+    , public IAfMelReporterCallback
 {
     friend class sp<AudioFlinger>;
     // TODO(b/291319167) Create interface and remove friends.
-    friend class MelReporter;
     friend class PatchPanel;
     // TODO(b/291012167) replace the Thread friends with an interface.
     friend class DirectOutputThread;
@@ -375,6 +375,7 @@
     // ---- begin IAfDeviceEffectManagerCallback interface
 
     bool isAudioPolicyReady() const final { return mAudioPolicyReady.load(); }
+    // below also used by IAfMelReporterCallback
     const sp<PatchCommandThread>& getPatchCommandThread() final { return mPatchCommandThread; }
     status_t addEffectToHal(
             const struct audio_port_config* device, const sp<EffectHalInterface>& effect) final;
@@ -383,6 +384,13 @@
 
     // ---- end of IAfDeviceEffectManagerCallback interface
 
+    // ---- begin IAfMelReporterCallback interface
+
+    Mutex& mutex() const final { return mLock; }
+    sp<IAfThreadBase> checkOutputThread_l(audio_io_handle_t ioHandle) const final REQUIRES(mLock);
+
+    // ---- end of IAfMelReporterCallback interface
+
     /* List available audio ports and their attributes */
     status_t listAudioPorts(unsigned int* num_ports, struct audio_port* ports) const;
 
@@ -620,7 +628,6 @@
     }
 
     IAfThreadBase* checkThread_l(audio_io_handle_t ioHandle) const;
-    sp<IAfThreadBase> checkOutputThread_l(audio_io_handle_t ioHandle) const REQUIRES(mLock);
     IAfPlaybackThread* checkPlaybackThread_l(audio_io_handle_t output) const;
     IAfPlaybackThread* checkMixerThread_l(audio_io_handle_t output) const;
     IAfRecordThread* checkRecordThread_l(audio_io_handle_t input) const;
@@ -876,7 +883,7 @@
 
     const sp<PatchCommandThread> mPatchCommandThread;
     /* const */ sp<DeviceEffectManager> mDeviceEffectManager;  // set onFirstRef
-    sp<MelReporter> mMelReporter;
+    /* const */ sp<MelReporter> mMelReporter;  // set onFirstRef
 
     bool       mSystemReady;
     std::atomic_bool mAudioPolicyReady{};