diff --git a/services/oboeservice/AAudioServiceStreamMMAP.h b/services/oboeservice/AAudioServiceStreamMMAP.h
index 533e5a8..e6f8fad 100644
--- a/services/oboeservice/AAudioServiceStreamMMAP.h
+++ b/services/oboeservice/AAudioServiceStreamMMAP.h
@@ -100,6 +100,8 @@
     aaudio_result_t getDownDataDescription(AudioEndpointParcelable &parcelable) override;
 
     aaudio_result_t getFreeRunningPosition(int64_t *positionFrames, int64_t *timeNanos) override;
+    virtual aaudio_result_t getHardwareTimestamp(int64_t *positionFrames,
+                                                 int64_t *timeNanos) override;
 
 private:
     // This proxy class was needed to prevent a crash in AudioFlinger
@@ -132,6 +134,7 @@
     MonotonicCounter                    mFramesRead;
     int32_t                             mPreviousFrameCounter = 0;   // from HAL
     int                                 mAudioDataFileDescriptor = -1;
+    int64_t                             mHardwareTimeOffsetNanos = 0; // TODO get from HAL
 
     // Interface to the AudioFlinger MMAP support.
     android::sp<android::MmapStreamInterface> mMmapStream;