diff --git a/include/media/AudioRecord.h b/include/media/AudioRecord.h
index 0ab26b8..bfb5d3a 100644
--- a/include/media/AudioRecord.h
+++ b/include/media/AudioRecord.h
@@ -389,6 +389,7 @@
     sp<IAudioRecord>        mAudioRecord;
     sp<IMemory>             mCblkMemory;
     audio_track_cblk_t*     mCblk;
+    void*                   mBuffers;           // starting address of buffers in shared memory
 
     int                     mPreviousPriority;          // before start()
     SchedPolicy             mPreviousSchedulingGroup;
diff --git a/include/media/AudioTrack.h b/include/media/AudioTrack.h
index 6e88032..639b567 100644
--- a/include/media/AudioTrack.h
+++ b/include/media/AudioTrack.h
@@ -510,6 +510,7 @@
     uint32_t                mFrameCount;
 
     audio_track_cblk_t*     mCblk;                  // re-load after mLock.unlock()
+    void*                   mBuffers;               // starting address of buffers in shared memory
     audio_format_t          mFormat;
     audio_stream_type_t     mStreamType;
     uint8_t                 mChannelCount;
diff --git a/include/private/media/AudioTrackShared.h b/include/private/media/AudioTrackShared.h
index 90301cd..8ef90c7 100644
--- a/include/private/media/AudioTrackShared.h
+++ b/include/private/media/AudioTrackShared.h
@@ -58,9 +58,7 @@
                 uint32_t    userBase;
                 uint32_t    serverBase;
 
-                // if there is a shared buffer, "buffers" is the value of pointer() for the shared
-                // buffer, otherwise "buffers" points immediately after the control block
-                void*       buffers;
+                int         mPad1;          // unused, but preserves cache line alignment
                 uint32_t    frameCount;
 
                 // Cache line boundary
@@ -111,7 +109,10 @@
 
                 bool        stepServer(uint32_t frameCount, bool isOut);
 
-                void*       buffer(uint32_t offset) const;
+                // if there is a shared buffer, "buffers" is the value of pointer() for the shared
+                // buffer, otherwise "buffers" points immediately after the control block
+                void*       buffer(void *buffers, uint32_t offset) const;
+
                 uint32_t    framesAvailableIn() { return framesAvailable(false); }
                 uint32_t    framesAvailableOut() { return framesAvailable(true); }
                 uint32_t    framesAvailableIn_l() { return framesAvailable_l(false); }