diff -r 000000000000 -r 6474c204b198 dom/webidl/AudioParam.webidl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/webidl/AudioParam.webidl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,39 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface AudioParam {
+
+    attribute float value;
+    readonly attribute float defaultValue;
+
+    // Parameter automation. 
+    [Throws]
+    void setValueAtTime(float value, double startTime);
+    [Throws]
+    void linearRampToValueAtTime(float value, double endTime);
+    [Throws]
+    void exponentialRampToValueAtTime(float value, double endTime);
+
+    // Exponentially approach the target value with a rate having the given time constant. 
+    [Throws]
+    void setTargetAtTime(float target, double startTime, double timeConstant);
+
+    // Sets an array of arbitrary parameter values starting at time for the given duration. 
+    // The number of values will be scaled to fit into the desired duration. 
+    [Throws]
+    void setValueCurveAtTime(Float32Array values, double startTime, double duration);
+
+    // Cancels all scheduled parameter changes with times greater than or equal to startTime. 
+    [Throws]
+    void cancelScheduledValues(double startTime);
+
+};