diff --git a/services/audioflinger/Tracks.cpp b/services/audioflinger/Tracks.cpp
index 1566b1f..da2d634 100644
--- a/services/audioflinger/Tracks.cpp
+++ b/services/audioflinger/Tracks.cpp
@@ -903,9 +903,14 @@
             mPreviousTimestampValid = false;
             return INVALID_OPERATION;
         }
+        // FIXME Not accurate under dynamic changes of sample rate and speed.
+        // Do not use track's mSampleRate as it is not current for mixer tracks.
+        uint32_t sampleRate = mAudioTrackServerProxy->getSampleRate();
+        float speed, pitch;
+        mAudioTrackServerProxy->getPlaybackRate(&speed, &pitch);
         uint32_t unpresentedFrames =
-                ((int64_t) playbackThread->mLatchQ.mUnpresentedFrames * mSampleRate) /
-                playbackThread->mSampleRate;
+                ((double) playbackThread->mLatchQ.mUnpresentedFrames * sampleRate * speed)
+                / playbackThread->mSampleRate;
         // FIXME Since we're using a raw pointer as the key, it is theoretically possible
         //       for a brand new track to share the same address as a recently destroyed
         //       track, and thus for us to get the frames released of the wrong track.