diff -r 000000000000 -r 6474c204b198 content/media/webaudio/AudioProcessingEvent.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/media/webaudio/AudioProcessingEvent.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,54 @@
+/* -*- 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 "AudioProcessingEvent.h"
+#include "mozilla/dom/AudioProcessingEventBinding.h"
+#include "AudioContext.h"
+
+namespace mozilla {
+namespace dom {
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(AudioProcessingEvent, Event,
+                                   mInputBuffer, mOutputBuffer, mNode)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(AudioProcessingEvent)
+NS_INTERFACE_MAP_END_INHERITING(Event)
+
+NS_IMPL_ADDREF_INHERITED(AudioProcessingEvent, Event)
+NS_IMPL_RELEASE_INHERITED(AudioProcessingEvent, Event)
+
+AudioProcessingEvent::AudioProcessingEvent(ScriptProcessorNode* aOwner,
+                                           nsPresContext* aPresContext,
+                                           WidgetEvent* aEvent)
+  : Event(aOwner, aPresContext, aEvent)
+  , mPlaybackTime(0.0)
+  , mNode(aOwner)
+{
+  SetIsDOMBinding();
+}
+
+JSObject*
+AudioProcessingEvent::WrapObject(JSContext* aCx)
+{
+  return AudioProcessingEventBinding::Wrap(aCx, this);
+}
+
+already_AddRefed<AudioBuffer>
+AudioProcessingEvent::LazilyCreateBuffer(uint32_t aNumberOfChannels,
+                                         ErrorResult& aRv)
+{
+  AutoPushJSContext cx(mNode->Context()->GetJSContext());
+  nsRefPtr<AudioBuffer> buffer =
+    AudioBuffer::Create(mNode->Context(), aNumberOfChannels,
+                        mNode->BufferSize(),
+                        mNode->Context()->SampleRate(), cx, aRv);
+  MOZ_ASSERT(buffer || aRv.ErrorCode() == NS_ERROR_OUT_OF_MEMORY);
+  return buffer.forget();
+}
+
+}
+}
+