Instantiate SingleStateQueue<AudioTimestamp>

as typedef AudioTimestampSingleStateQueue and use it in MonoPipe.

Change-Id: Idaebb362bd9d0a81a7ed83792ab9369dc37c0e74
diff --git a/include/media/nbaio/MonoPipe.h b/include/media/nbaio/MonoPipe.h
index ffdcc21..d3802fe 100644
--- a/include/media/nbaio/MonoPipe.h
+++ b/include/media/nbaio/MonoPipe.h
@@ -20,9 +20,12 @@
 #include <time.h>
 #include <utils/LinearTransform.h>
 #include "NBAIO.h"
+#include <media/SingleStateQueue.h>
 
 namespace android {
 
+typedef SingleStateQueue<AudioTimestamp> AudioTimestampSingleStateQueue;
+
 // MonoPipe is similar to Pipe except:
 //  - supports only a single reader, called MonoPipeReader
 //  - write() cannot overrun; instead it will return a short actual count if insufficient space
@@ -130,6 +133,10 @@
     LinearTransform mSamplesToLocalTime;
 
     bool            mIsShutdown;    // whether shutdown(true) was called, no barriers are needed
+
+    AudioTimestampSingleStateQueue::Shared      mTimestampShared;
+    AudioTimestampSingleStateQueue::Mutator     mTimestampMutator;
+    AudioTimestampSingleStateQueue::Observer    mTimestampObserver;
 };
 
 }   // namespace android