diff --git a/media/libmedia/IAudioTrack.cpp b/media/libmedia/IAudioTrack.cpp
index f0d75ba..3cd9cfd 100644
--- a/media/libmedia/IAudioTrack.cpp
+++ b/media/libmedia/IAudioTrack.cpp
@@ -41,6 +41,7 @@
     SET_MEDIA_TIME_TRANSFORM,
     SET_PARAMETERS,
     GET_TIMESTAMP,
+    SIGNAL,
 };
 
 class BpAudioTrack : public BpInterface<IAudioTrack>
@@ -182,6 +183,12 @@
         }
         return status;
     }
+
+    virtual void signal() {
+        Parcel data, reply;
+        data.writeInterfaceToken(IAudioTrack::getInterfaceDescriptor());
+        remote()->transact(SIGNAL, data, &reply);
+    }
 };
 
 IMPLEMENT_META_INTERFACE(AudioTrack, "android.media.IAudioTrack");
@@ -269,6 +276,11 @@
             }
             return NO_ERROR;
         } break;
+        case SIGNAL: {
+            CHECK_INTERFACE(IAudioTrack, data, reply);
+            signal();
+            return NO_ERROR;
+        } break;
         default:
             return BBinder::onTransact(code, data, reply, flags);
     }