diff --git a/include/media/MmapStreamInterface.h b/include/media/MmapStreamInterface.h
index b3bf16d..61de987 100644
--- a/include/media/MmapStreamInterface.h
+++ b/include/media/MmapStreamInterface.h
@@ -22,6 +22,8 @@
 #include <utils/Errors.h>
 #include <utils/RefBase.h>
 
+#include <time.h>
+
 namespace android {
 
 class MmapStreamCallback;
@@ -103,6 +105,19 @@
     virtual status_t getMmapPosition(struct audio_mmap_position *position) = 0;
 
     /**
+     * Get a recent count of the number of audio frames presented/received to/from an
+     * external observer.
+     *
+     * \param[out] position count of presented audio frames
+     * \param[out] timeNanos associated clock time
+     *
+     * \return OK if the external position is set correctly.
+     *         NO_INIT in case of initialization error
+     *         INVALID_OPERATION if the interface is not implemented
+     */
+    virtual status_t getExternalPosition(uint64_t* position, int64_t* timeNanos) = 0;
+
+    /**
      * Start a stream operating in mmap mode.
      * createMmapBuffer() must be called before calling start()
      *