diff --git a/include/media/AudioTrack.h b/include/media/AudioTrack.h
index f379ee5..f6646ab 100644
--- a/include/media/AudioTrack.h
+++ b/include/media/AudioTrack.h
@@ -661,7 +661,7 @@
     sp<AudioTrackThread>    mAudioTrackThread;
     float                   mVolume[2];
     float                   mSendLevel;
-    uint32_t                mSampleRate;
+    mutable uint32_t        mSampleRate;            // mutable because getSampleRate() can update it.
     size_t                  mFrameCount;            // corresponds to current IAudioTrack
     size_t                  mReqFrameCount;         // frame count to request the next time a new
                                                     // IAudioTrack is needed
diff --git a/include/media/MediaPlayerInterface.h b/include/media/MediaPlayerInterface.h
index cc244f0..26d8729 100644
--- a/include/media/MediaPlayerInterface.h
+++ b/include/media/MediaPlayerInterface.h
@@ -100,6 +100,7 @@
         virtual status_t    getFramesWritten(uint32_t *frameswritten) const = 0;
         virtual int         getSessionId() const = 0;
         virtual audio_stream_type_t getAudioStreamType() const = 0;
+        virtual uint32_t    getSampleRate() const = 0;
 
         // If no callback is specified, use the "write" API below to submit
         // audio data.
diff --git a/include/media/stagefright/AudioPlayer.h b/include/media/stagefright/AudioPlayer.h
index 912a43c..14afb85 100644
--- a/include/media/stagefright/AudioPlayer.h
+++ b/include/media/stagefright/AudioPlayer.h
@@ -129,7 +129,7 @@
     void reset();
 
     uint32_t getNumFramesPendingPlayout() const;
-    int64_t getOutputPlayPositionUs_l() const;
+    int64_t getOutputPlayPositionUs_l();
 
     bool allowDeepBuffering() const { return (mCreateFlags & ALLOW_DEEP_BUFFERING) != 0; }
     bool useOffload() const { return (mCreateFlags & USE_OFFLOAD) != 0; }