diff --git a/include/media/AudioRecord.h b/include/media/AudioRecord.h
index bfb5d3a..2672db1 100644
--- a/include/media/AudioRecord.h
+++ b/include/media/AudioRecord.h
@@ -185,7 +185,7 @@
             audio_format_t format() const;
             int         channelCount() const;
             uint32_t    frameCount() const;
-            size_t      frameSize() const;
+            size_t      frameSize() const { return mFrameSize; }
             audio_source_t inputSource() const;
 
 
@@ -378,6 +378,7 @@
     uint32_t                mFrameCount;
     audio_format_t          mFormat;
     uint8_t                 mChannelCount;
+    size_t                  mFrameSize;         // app-level frame size == AudioFlinger frame size
     audio_source_t          mInputSource;
     status_t                mStatus;
     uint32_t                mLatency;
diff --git a/include/media/AudioTrack.h b/include/media/AudioTrack.h
index 639b567..3504f1f 100644
--- a/include/media/AudioTrack.h
+++ b/include/media/AudioTrack.h
@@ -229,7 +229,7 @@
     /* Return channelCount * (bit depth per channel / 8).
      * channelCount is determined from channelMask, and bit depth comes from format.
      */
-            size_t      frameSize() const;
+            size_t      frameSize() const { return mFrameSize; }
 
             sp<IMemory>& sharedBuffer();
 
@@ -517,6 +517,13 @@
     uint8_t                 mMuted;
     uint8_t                 mReserved;
     audio_channel_mask_t    mChannelMask;
+
+                // mFrameSize is equal to mFrameSizeAF for non-PCM or 16-bit PCM data.
+                // For 8-bit PCM data, mFrameSizeAF is
+                // twice as large because data is expanded to 16-bit before being stored in buffer.
+    size_t                  mFrameSize;             // app-level frame size
+    size_t                  mFrameSizeAF;           // AudioFlinger frame size
+
     status_t                mStatus;
     uint32_t                mLatency;
 
diff --git a/include/private/media/AudioTrackShared.h b/include/private/media/AudioTrackShared.h
index 8ef90c7..ac5372f 100644
--- a/include/private/media/AudioTrackShared.h
+++ b/include/private/media/AudioTrackShared.h
@@ -77,12 +77,9 @@
 
                 uint32_t    sampleRate;
 
-                // NOTE: audio_track_cblk_t::frameSize is not equal to AudioTrack::frameSize() for
-                // 8 bit PCM data: in this case,  mCblk->frameSize is based on a sample size of
-                // 16 bit because data is converted to 16 bit before being stored in buffer
+                uint8_t     mPad2;           // unused
 
                 // read-only for client, server writes once at initialization and is then read-only
-                uint8_t     frameSize;       // would normally be size_t, but 8 bits is plenty
                 uint8_t     mName;           // normal tracks: track name, fast tracks: track index
 
                 // used by client only
@@ -111,7 +108,7 @@
 
                 // 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;
+                void*       buffer(void *buffers, uint32_t frameSize, uint32_t offset) const;
 
                 uint32_t    framesAvailableIn() { return framesAvailable(false); }
                 uint32_t    framesAvailableOut() { return framesAvailable(true); }