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diff --git a/dom/webidl/RTCRtpSources.webidl b/dom/webidl/RTCRtpSources.webidl
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+++ b/dom/webidl/RTCRtpSources.webidl
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+/* -*- 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://w3c.github.io/webrtc-pc/ Editor's Draft 18 January 2018
+ */
+
+dictionary RTCRtpContributingSource {
+    required DOMHighResTimeStamp timestamp;
+    required unsigned long source;
+    double audioLevel;
+    required unsigned long rtpTimestamp;
+};
+
+dictionary RTCRtpSynchronizationSource : RTCRtpContributingSource {
+    boolean? voiceActivityFlag;
+};
+
+/* Internal enum of types used by RTCRtpSourceEntry */
+enum RTCRtpSourceEntryType {
+    "contributing",
+    "synchronization",
+};
+/* Internal shared representation of Contributing and Synchronization sources */
+dictionary RTCRtpSourceEntry : RTCRtpSynchronizationSource {
+    required RTCRtpSourceEntryType sourceType;
+};