diff --git a/include/media/AudioSystem.h b/include/media/AudioSystem.h
index 1e29d82..03f8944 100644
--- a/include/media/AudioSystem.h
+++ b/include/media/AudioSystem.h
@@ -204,8 +204,9 @@
     // set audio mode in audio hardware (see AudioSystem::audio_mode)
     static status_t setMode(int mode);
 
-    // returns true in *state if tracks are active on the specified stream
-    static status_t isStreamActive(int stream, bool *state);
+    // returns true in *state if tracks are active on the specified stream or has been active
+    // in the past inPastMs milliseconds
+    static status_t isStreamActive(int stream, bool *state, uint32_t inPastMs = 0);
 
     // set/get audio hardware parameters. The function accepts a list of parameters
     // key value pairs in the form: key1=value1;key2=value2;...