diff --git a/dom/media/webaudio/AudioBufferSourceNode.cpp b/dom/media/webaudio/AudioBufferSourceNode.cpp
index 2878c8c628ec..9993b42dcb76 100644
--- a/dom/media/webaudio/AudioBufferSourceNode.cpp
+++ b/dom/media/webaudio/AudioBufferSourceNode.cpp
@@ -22,13 +22,15 @@
 namespace mozilla {
 namespace dom {
 
-NS_IMPL_CYCLE_COLLECTION_INHERITED(AudioBufferSourceNode, AudioNode, mBuffer, mPlaybackRate, mDetune)
+NS_IMPL_CYCLE_COLLECTION_INHERITED(AudioBufferSourceNode,
+                                   AudioScheduledSourceNode, mBuffer,
+                                   mPlaybackRate, mDetune)
 
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(AudioBufferSourceNode)
-NS_INTERFACE_MAP_END_INHERITING(AudioNode)
+NS_INTERFACE_MAP_END_INHERITING(AudioScheduledSourceNode)
 
-NS_IMPL_ADDREF_INHERITED(AudioBufferSourceNode, AudioNode)
-NS_IMPL_RELEASE_INHERITED(AudioBufferSourceNode, AudioNode)
+NS_IMPL_ADDREF_INHERITED(AudioBufferSourceNode, AudioScheduledSourceNode)
+NS_IMPL_RELEASE_INHERITED(AudioBufferSourceNode, AudioScheduledSourceNode)
 
 /**
  * Media-thread playback engine for AudioBufferSourceNode.
@@ -588,10 +590,10 @@ public:
 };
 
 AudioBufferSourceNode::AudioBufferSourceNode(AudioContext* aContext)
-  : AudioNode(aContext,
-              2,
-              ChannelCountMode::Max,
-              ChannelInterpretation::Speakers)
+  : AudioScheduledSourceNode(aContext,
+                             2,
+                             ChannelCountMode::Max,
+                             ChannelInterpretation::Speakers)
   , mLoopStart(0.0)
   , mLoopEnd(0.0)
   // mOffset and mDuration are initialized in Start().
@@ -711,6 +713,12 @@ AudioBufferSourceNode::Start(double aWhen, double aOffset,
   }
 }
 
+void
+AudioBufferSourceNode::Start(double aWhen, ErrorResult& aRv)
+{
+  Start(aWhen, 0 /* offset */, Optional<double>(), aRv);
+}
+
 void
 AudioBufferSourceNode::SendBufferParameterToStream(JSContext* aCx)
 {
diff --git a/dom/media/webaudio/AudioBufferSourceNode.h b/dom/media/webaudio/AudioBufferSourceNode.h
index 1011cd219bab..f42136acc74f 100644
--- a/dom/media/webaudio/AudioBufferSourceNode.h
+++ b/dom/media/webaudio/AudioBufferSourceNode.h
@@ -7,7 +7,7 @@
 #ifndef AudioBufferSourceNode_h_
 #define AudioBufferSourceNode_h_
 
-#include "AudioNode.h"
+#include "AudioScheduledSourceNode.h"
 #include "AudioBuffer.h"
 
 namespace mozilla {
@@ -16,7 +16,7 @@ namespace dom {
 struct AudioBufferSourceOptions;
 class AudioParam;
 
-class AudioBufferSourceNode final : public AudioNode
+class AudioBufferSourceNode final : public AudioScheduledSourceNode
                                   , public MainThreadMediaStreamListener
 {
 public:
@@ -35,7 +35,8 @@ public:
     return this;
   }
   NS_DECL_ISUPPORTS_INHERITED
-  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(AudioBufferSourceNode, AudioNode)
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(AudioBufferSourceNode,
+                                           AudioScheduledSourceNode)
 
   static already_AddRefed<AudioBufferSourceNode>
   Constructor(const GlobalObject& aGlobal, AudioContext& aAudioContext,
@@ -48,7 +49,9 @@ public:
 
   void Start(double aWhen, double aOffset,
              const Optional<double>& aDuration, ErrorResult& aRv);
-  void Stop(double aWhen, ErrorResult& aRv);
+
+  void Start(double aWhen, ErrorResult& aRv) override;
+  void Stop(double aWhen, ErrorResult& aRv) override;
 
   AudioBuffer* GetBuffer(JSContext* aCx) const
   {
@@ -97,8 +100,6 @@ public:
   }
   void SendDopplerShiftToStream(double aDopplerShift);
 
-  IMPL_EVENT_HANDLER(ended)
-
   void NotifyMainThreadStreamFinished() override;
 
   const char* NodeType() const override
diff --git a/dom/media/webaudio/AudioScheduledSourceNode.cpp b/dom/media/webaudio/AudioScheduledSourceNode.cpp
new file mode 100644
index 000000000000..4cb4e1514da7
--- /dev/null
+++ b/dom/media/webaudio/AudioScheduledSourceNode.cpp
@@ -0,0 +1,29 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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/. */
+
+#include "AudioScheduledSourceNode.h"
+#include "mozilla/dom/AudioScheduledSourceNodeBinding.h"
+
+namespace mozilla {
+namespace dom {
+
+AudioScheduledSourceNode::AudioScheduledSourceNode(AudioContext* aContext,
+                                                   uint32_t aChannelCount,
+                                                   ChannelCountMode aChannelCountMode,
+                                                   ChannelInterpretation aChannelInterpretation)
+  : AudioNode(aContext, aChannelCount, aChannelCountMode,
+              aChannelInterpretation)
+{}
+
+JSObject*
+AudioScheduledSourceNode::WrapObject(JSContext* aCx,
+                                     JS::Handle<JSObject*> aGivenProto)
+{
+  return AudioScheduledSourceNodeBinding::Wrap(aCx, this, aGivenProto);
+}
+
+} // dom namespace
+} // mozilla namespace
diff --git a/dom/media/webaudio/AudioScheduledSourceNode.h b/dom/media/webaudio/AudioScheduledSourceNode.h
new file mode 100644
index 000000000000..6cea3d4797ab
--- /dev/null
+++ b/dom/media/webaudio/AudioScheduledSourceNode.h
@@ -0,0 +1,40 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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/. */
+
+#ifndef AudioScheduledSourceNode_h_
+#define AudioScheduledSourceNode_h_
+
+#include "AudioNode.h"
+#include "mozilla/dom/AudioScheduledSourceNodeBinding.h"
+
+namespace mozilla {
+namespace dom {
+
+class AudioContext;
+
+class AudioScheduledSourceNode : public AudioNode
+{
+public:
+  JSObject* WrapObject(JSContext* aCx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+
+  virtual void Start(double aWhen, ErrorResult& aRv) = 0;
+  virtual void Stop(double aWhen, ErrorResult& aRv) = 0;
+
+  IMPL_EVENT_HANDLER(ended)
+
+protected:
+  AudioScheduledSourceNode(AudioContext* aContext,
+                           uint32_t aChannelCount,
+                           ChannelCountMode aChannelCountMode,
+                           ChannelInterpretation aChannelInterpretation);
+  virtual ~AudioScheduledSourceNode() = default;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif
diff --git a/dom/media/webaudio/ConstantSourceNode.cpp b/dom/media/webaudio/ConstantSourceNode.cpp
index b6884105cf5a..bfcb7e743962 100644
--- a/dom/media/webaudio/ConstantSourceNode.cpp
+++ b/dom/media/webaudio/ConstantSourceNode.cpp
@@ -12,14 +12,14 @@
 namespace mozilla {
 namespace dom {
 
-NS_IMPL_CYCLE_COLLECTION_INHERITED(ConstantSourceNode, AudioNode,
+NS_IMPL_CYCLE_COLLECTION_INHERITED(ConstantSourceNode, AudioScheduledSourceNode,
                                    mOffset)
 
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(ConstantSourceNode)
-NS_INTERFACE_MAP_END_INHERITING(AudioNode)
+NS_INTERFACE_MAP_END_INHERITING(AudioScheduledSourceNode)
 
-NS_IMPL_ADDREF_INHERITED(ConstantSourceNode, AudioNode)
-NS_IMPL_RELEASE_INHERITED(ConstantSourceNode, AudioNode)
+NS_IMPL_ADDREF_INHERITED(ConstantSourceNode, AudioScheduledSourceNode)
+NS_IMPL_RELEASE_INHERITED(ConstantSourceNode, AudioScheduledSourceNode)
 
 class ConstantSourceNodeEngine final : public AudioNodeEngine
 {
@@ -142,10 +142,10 @@ public:
 };
 
 ConstantSourceNode::ConstantSourceNode(AudioContext* aContext)
-  : AudioNode(aContext,
-              1,
-              ChannelCountMode::Max,
-              ChannelInterpretation::Speakers)
+  : AudioScheduledSourceNode(aContext,
+                             1,
+                             ChannelCountMode::Max,
+                             ChannelInterpretation::Speakers)
   , mOffset(new AudioParam(this, ConstantSourceNodeEngine::OFFSET,
                            1.0, "offset"))
   , mStartCalled(false)
diff --git a/dom/media/webaudio/ConstantSourceNode.h b/dom/media/webaudio/ConstantSourceNode.h
index 7b5e7197e93f..90e70be97b32 100644
--- a/dom/media/webaudio/ConstantSourceNode.h
+++ b/dom/media/webaudio/ConstantSourceNode.h
@@ -7,7 +7,7 @@
 #ifndef ConstantSourceNode_h_
 #define ConstantSourceNode_h_
 
-#include "AudioNode.h"
+#include "AudioScheduledSourceNode.h"
 #include "AudioParam.h"
 #include "mozilla/dom/ConstantSourceNodeBinding.h"
 
@@ -16,14 +16,14 @@ namespace dom {
 
 class AudioContext;
 
-class ConstantSourceNode final : public AudioNode,
-                                 public MainThreadMediaStreamListener
+class ConstantSourceNode final : public AudioScheduledSourceNode
+                               , public MainThreadMediaStreamListener
 {
 public:
   explicit ConstantSourceNode(AudioContext* aContext);
 
   NS_DECL_ISUPPORTS_INHERITED
-  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(ConstantSourceNode, AudioNode)
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(ConstantSourceNode, AudioScheduledSourceNode)
 
   JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
 
@@ -45,10 +45,8 @@ public:
     return mOffset;
   }
 
-  void Start(double aWhen, ErrorResult& rv);
-  void Stop(double aWhen, ErrorResult& rv);
-
-  IMPL_EVENT_HANDLER(ended)
+  void Start(double aWhen, ErrorResult& rv) override;
+  void Stop(double aWhen, ErrorResult& rv) override;
 
   void NotifyMainThreadStreamFinished() override;
 
diff --git a/dom/media/webaudio/OscillatorNode.cpp b/dom/media/webaudio/OscillatorNode.cpp
index 63a27d3345b0..54c6c48ab5db 100644
--- a/dom/media/webaudio/OscillatorNode.cpp
+++ b/dom/media/webaudio/OscillatorNode.cpp
@@ -15,14 +15,14 @@
 namespace mozilla {
 namespace dom {
 
-NS_IMPL_CYCLE_COLLECTION_INHERITED(OscillatorNode, AudioNode,
+NS_IMPL_CYCLE_COLLECTION_INHERITED(OscillatorNode, AudioScheduledSourceNode,
                                    mPeriodicWave, mFrequency, mDetune)
 
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(OscillatorNode)
-NS_INTERFACE_MAP_END_INHERITING(AudioNode)
+NS_INTERFACE_MAP_END_INHERITING(AudioScheduledSourceNode)
 
-NS_IMPL_ADDREF_INHERITED(OscillatorNode, AudioNode)
-NS_IMPL_RELEASE_INHERITED(OscillatorNode, AudioNode)
+NS_IMPL_ADDREF_INHERITED(OscillatorNode, AudioScheduledSourceNode)
+NS_IMPL_RELEASE_INHERITED(OscillatorNode, AudioScheduledSourceNode)
 
 class OscillatorNodeEngine final : public AudioNodeEngine
 {
@@ -408,10 +408,10 @@ public:
 };
 
 OscillatorNode::OscillatorNode(AudioContext* aContext)
-  : AudioNode(aContext,
-              2,
-              ChannelCountMode::Max,
-              ChannelInterpretation::Speakers)
+  : AudioScheduledSourceNode(aContext,
+                             2,
+                             ChannelCountMode::Max,
+                             ChannelInterpretation::Speakers)
   , mType(OscillatorType::Sine)
   , mFrequency(new AudioParam(this, OscillatorNodeEngine::FREQUENCY,
                               440.0f, "frequency"))
diff --git a/dom/media/webaudio/OscillatorNode.h b/dom/media/webaudio/OscillatorNode.h
index 580a22ca0529..24304e87e6b4 100644
--- a/dom/media/webaudio/OscillatorNode.h
+++ b/dom/media/webaudio/OscillatorNode.h
@@ -7,7 +7,7 @@
 #ifndef OscillatorNode_h_
 #define OscillatorNode_h_
 
-#include "AudioNode.h"
+#include "AudioScheduledSourceNode.h"
 #include "AudioParam.h"
 #include "PeriodicWave.h"
 #include "mozilla/dom/OscillatorNodeBinding.h"
@@ -18,8 +18,8 @@ namespace dom {
 class AudioContext;
 struct OscillatorOptions;
 
-class OscillatorNode final : public AudioNode,
-                             public MainThreadMediaStreamListener
+class OscillatorNode final : public AudioScheduledSourceNode
+                           , public MainThreadMediaStreamListener
 {
 public:
   static already_AddRefed<OscillatorNode>
@@ -27,7 +27,7 @@ public:
          ErrorResult& aRv);
 
   NS_DECL_ISUPPORTS_INHERITED
-  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(OscillatorNode, AudioNode)
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(OscillatorNode, AudioScheduledSourceNode)
 
   static already_AddRefed<OscillatorNode>
   Constructor(const GlobalObject& aGlobal, AudioContext& aAudioContext,
@@ -70,8 +70,9 @@ public:
     return mDetune;
   }
 
-  void Start(double aWhen, ErrorResult& aRv);
-  void Stop(double aWhen, ErrorResult& aRv);
+  void Start(double aWhen, ErrorResult& aRv) override;
+  void Stop(double aWhen, ErrorResult& aRv) override;
+
   void SetPeriodicWave(PeriodicWave& aPeriodicWave)
   {
     mPeriodicWave = &aPeriodicWave;
@@ -80,8 +81,6 @@ public:
     SendTypeToStream();
   }
 
-  IMPL_EVENT_HANDLER(ended)
-
   void NotifyMainThreadStreamFinished() override;
 
   const char* NodeType() const override
diff --git a/dom/media/webaudio/moz.build b/dom/media/webaudio/moz.build
index db064484113d..87e820bb920c 100644
--- a/dom/media/webaudio/moz.build
+++ b/dom/media/webaudio/moz.build
@@ -54,6 +54,7 @@ EXPORTS.mozilla.dom += [
     'AudioNode.h',
     'AudioParam.h',
     'AudioProcessingEvent.h',
+    'AudioScheduledSourceNode.h',
     'BiquadFilterNode.h',
     'ChannelMergerNode.h',
     'ChannelSplitterNode.h',
@@ -89,6 +90,7 @@ UNIFIED_SOURCES += [
     'AudioNodeStream.cpp',
     'AudioParam.cpp',
     'AudioProcessingEvent.cpp',
+    'AudioScheduledSourceNode.cpp',
     'BiquadFilterNode.cpp',
     'BufferDecoder.cpp',
     'ChannelMergerNode.cpp',
diff --git a/dom/tests/mochitest/general/test_interfaces.html b/dom/tests/mochitest/general/test_interfaces.html
index cc2512f03996..0123040ac859 100644
--- a/dom/tests/mochitest/general/test_interfaces.html
+++ b/dom/tests/mochitest/general/test_interfaces.html
@@ -154,6 +154,8 @@ var interfaceNamesInGlobalScope =
     "AudioParam",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "AudioProcessingEvent",
+// IMPORTANT: Do not change this list without review from a DOM peer!
+    "AudioScheduledSourceNode",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "AudioStreamTrack",
 // IMPORTANT: Do not change this list without review from a DOM peer!
diff --git a/dom/webidl/AudioBufferSourceNode.webidl b/dom/webidl/AudioBufferSourceNode.webidl
index abd6c38e33e0..455b269cf4a2 100644
--- a/dom/webidl/AudioBufferSourceNode.webidl
+++ b/dom/webidl/AudioBufferSourceNode.webidl
@@ -21,7 +21,7 @@ dictionary AudioBufferSourceOptions {
 
 [Pref="dom.webaudio.enabled",
  Constructor(BaseAudioContext context, optional AudioBufferSourceOptions options)]
-interface AudioBufferSourceNode : AudioNode {
+interface AudioBufferSourceNode : AudioScheduledSourceNode {
 
     attribute AudioBuffer? buffer;
 
@@ -35,10 +35,6 @@ interface AudioBufferSourceNode : AudioNode {
     [Throws, UnsafeInPrerendering]
     void start(optional double when = 0, optional double grainOffset = 0,
                optional double grainDuration);
-    [Throws, UnsafeInPrerendering]
-    void stop(optional double when = 0);
-
-    attribute EventHandler onended;
 };
 
 // Mozilla extensions
diff --git a/dom/webidl/AudioScheduledSourceNode.webidl b/dom/webidl/AudioScheduledSourceNode.webidl
new file mode 100644
index 000000000000..6a5f381a06ee
--- /dev/null
+++ b/dom/webidl/AudioScheduledSourceNode.webidl
@@ -0,0 +1,20 @@
+/* -*- 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://webaudio.github.io/web-audio-api/#idl-def-AudioScheduledSourceNode
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface AudioScheduledSourceNode : AudioNode {
+                    attribute EventHandler onended;
+    [Throws, UnsafeInPrerendering]
+    void start (optional double when = 0);
+
+    [Throws, UnsafeInPrerendering]
+    void stop (optional double when = 0);
+};
diff --git a/dom/webidl/ConstantSourceNode.webidl b/dom/webidl/ConstantSourceNode.webidl
index 598f1bbea960..cd005897aacd 100644
--- a/dom/webidl/ConstantSourceNode.webidl
+++ b/dom/webidl/ConstantSourceNode.webidl
@@ -16,11 +16,6 @@ dictionary ConstantSourceOptions {
 
 [Pref="dom.webaudio.enabled",
  Constructor(BaseAudioContext context, optional ConstantSourceOptions options)]
-interface ConstantSourceNode : AudioNode {
+interface ConstantSourceNode :  AudioScheduledSourceNode {
     readonly        attribute AudioParam   offset;
-                    attribute EventHandler onended;
-    [Throws, UnsafeInPrerendering]
-    void start (optional double when = 0);
-    [Throws, UnsafeInPrerendering]
-    void stop (optional double when = 0);
 };
diff --git a/dom/webidl/OscillatorNode.webidl b/dom/webidl/OscillatorNode.webidl
index 8d88e6f44619..acf75a81812e 100644
--- a/dom/webidl/OscillatorNode.webidl
+++ b/dom/webidl/OscillatorNode.webidl
@@ -27,7 +27,7 @@ dictionary OscillatorOptions : AudioNodeOptions {
 
 [Pref="dom.webaudio.enabled",
  Constructor(BaseAudioContext context, optional OscillatorOptions options)]
-interface OscillatorNode : AudioNode {
+interface OscillatorNode : AudioScheduledSourceNode {
 
     [SetterThrows]
     attribute OscillatorType type;
@@ -35,14 +35,7 @@ interface OscillatorNode : AudioNode {
     readonly attribute AudioParam frequency; // in Hertz
     readonly attribute AudioParam detune; // in Cents
 
-    [Throws, UnsafeInPrerendering]
-    void start(optional double when = 0);
-    [Throws, UnsafeInPrerendering]
-    void stop(optional double when = 0);
     void setPeriodicWave(PeriodicWave periodicWave);
-
-    attribute EventHandler onended;
-
 };
 
 // Mozilla extensions
diff --git a/dom/webidl/moz.build b/dom/webidl/moz.build
index b744f6459998..5a4d3eafc2db 100644
--- a/dom/webidl/moz.build
+++ b/dom/webidl/moz.build
@@ -41,6 +41,7 @@ WEBIDL_FILES = [
     'AudioNode.webidl',
     'AudioParam.webidl',
     'AudioProcessingEvent.webidl',
+    'AudioScheduledSourceNode.webidl',
     'AudioStreamTrack.webidl',
     'AudioTrack.webidl',
     'AudioTrackList.webidl',