diff -r 000000000000 -r 6474c204b198 content/media/webaudio/PeriodicWave.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/media/webaudio/PeriodicWave.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,68 @@
+/* -*- 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 "PeriodicWave.h"
+#include "AudioContext.h"
+#include "mozilla/dom/PeriodicWaveBinding.h"
+
+namespace mozilla {
+namespace dom {
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_1(PeriodicWave, mContext)
+
+NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(PeriodicWave, AddRef)
+NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(PeriodicWave, Release)
+
+PeriodicWave::PeriodicWave(AudioContext* aContext,
+                           const float* aRealData,
+                           const float* aImagData,
+                           const uint32_t aLength,
+                           ErrorResult& aRv)
+  : mContext(aContext)
+{
+  MOZ_ASSERT(aContext);
+  SetIsDOMBinding();
+
+  // Caller should have checked this and thrown.
+  MOZ_ASSERT(aLength > 0);
+  MOZ_ASSERT(aLength <= 4096);
+  mLength = aLength;
+
+  // Copy coefficient data. The two arrays share an allocation.
+  mCoefficients = new ThreadSharedFloatArrayBufferList(2);
+  float* buffer = static_cast<float*>(malloc(aLength*sizeof(float)*2));
+  if (buffer == nullptr) {
+    aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
+    return;
+  }
+  PodCopy(buffer, aRealData, aLength);
+  mCoefficients->SetData(0, buffer, buffer);
+  PodCopy(buffer+aLength, aImagData, aLength);
+  mCoefficients->SetData(1, nullptr, buffer+aLength);
+}
+
+size_t
+PeriodicWave::SizeOfExcludingThisIfNotShared(MallocSizeOf aMallocSizeOf) const
+{
+  // Not owned:
+  // - mContext
+  size_t amount = 0;
+  if (!mCoefficients->IsShared()) {
+    amount += mCoefficients->SizeOfIncludingThis(aMallocSizeOf);
+  }
+
+  return amount;
+}
+
+JSObject*
+PeriodicWave::WrapObject(JSContext* aCx)
+{
+  return PeriodicWaveBinding::Wrap(aCx, this);
+}
+
+} // namespace dom
+} // namespace mozilla
+