diff -r 000000000000 -r 6474c204b198 content/media/webaudio/AudioListener.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/media/webaudio/AudioListener.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,132 @@
+/* -*- 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 "AudioListener.h"
+#include "AudioContext.h"
+#include "mozilla/dom/AudioListenerBinding.h"
+
+namespace mozilla {
+namespace dom {
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_1(AudioListener, mContext)
+
+NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(AudioListener, AddRef)
+NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(AudioListener, Release)
+
+AudioListener::AudioListener(AudioContext* aContext)
+  : mContext(aContext)
+  , mPosition()
+  , mFrontVector(0., 0., -1.)
+  , mRightVector(1., 0., 0.)
+  , mVelocity()
+  , mDopplerFactor(1.)
+  , mSpeedOfSound(343.3) // meters/second
+{
+  MOZ_ASSERT(aContext);
+  SetIsDOMBinding();
+}
+
+JSObject*
+AudioListener::WrapObject(JSContext* aCx)
+{
+  return AudioListenerBinding::Wrap(aCx, this);
+}
+
+void
+AudioListener::SetOrientation(double aX, double aY, double aZ,
+                              double aXUp, double aYUp, double aZUp)
+{
+  ThreeDPoint front(aX, aY, aZ);
+  // The panning effect and the azimuth and elevation calculation in the Web
+  // Audio spec becomes undefined with linearly dependent vectors, so keep
+  // existing state in these situations.
+  if (front.IsZero()) {
+    return;
+  }
+  // Normalize before using CrossProduct() to avoid overflow.
+  front.Normalize();
+  ThreeDPoint up(aXUp, aYUp, aZUp);
+  if (up.IsZero()) {
+    return;
+  }
+  up.Normalize();
+  ThreeDPoint right = front.CrossProduct(up);
+  if (right.IsZero()) {
+    return;
+  }
+  right.Normalize();
+
+  if (!mFrontVector.FuzzyEqual(front)) {
+    mFrontVector = front;
+    SendThreeDPointParameterToStream(PannerNode::LISTENER_FRONT_VECTOR, front);
+  }
+  if (!mRightVector.FuzzyEqual(right)) {
+    mRightVector = right;
+    SendThreeDPointParameterToStream(PannerNode::LISTENER_RIGHT_VECTOR, right);
+  }
+}
+
+void
+AudioListener::RegisterPannerNode(PannerNode* aPannerNode)
+{
+  mPanners.AppendElement(aPannerNode->asWeakPtr());
+
+  // Let the panner node know about our parameters
+  aPannerNode->SendThreeDPointParameterToStream(PannerNode::LISTENER_POSITION, mPosition);
+  aPannerNode->SendThreeDPointParameterToStream(PannerNode::LISTENER_FRONT_VECTOR, mFrontVector);
+  aPannerNode->SendThreeDPointParameterToStream(PannerNode::LISTENER_RIGHT_VECTOR, mRightVector);
+  aPannerNode->SendThreeDPointParameterToStream(PannerNode::LISTENER_VELOCITY, mVelocity);
+  aPannerNode->SendDoubleParameterToStream(PannerNode::LISTENER_DOPPLER_FACTOR, mDopplerFactor);
+  aPannerNode->SendDoubleParameterToStream(PannerNode::LISTENER_SPEED_OF_SOUND, mSpeedOfSound);
+  UpdatePannersVelocity();
+}
+
+void AudioListener::UnregisterPannerNode(PannerNode* aPannerNode)
+{
+  mPanners.RemoveElement(aPannerNode);
+}
+
+void
+AudioListener::SendDoubleParameterToStream(uint32_t aIndex, double aValue)
+{
+  for (uint32_t i = 0; i < mPanners.Length(); ++i) {
+    if (mPanners[i]) {
+      mPanners[i]->SendDoubleParameterToStream(aIndex, aValue);
+    }
+  }
+}
+
+void
+AudioListener::SendThreeDPointParameterToStream(uint32_t aIndex, const ThreeDPoint& aValue)
+{
+  for (uint32_t i = 0; i < mPanners.Length(); ++i) {
+    if (mPanners[i]) {
+      mPanners[i]->SendThreeDPointParameterToStream(aIndex, aValue);
+    }
+  }
+}
+
+void AudioListener::UpdatePannersVelocity()
+{
+  for (uint32_t i = 0; i < mPanners.Length(); ++i) {
+    if (mPanners[i]) {
+      mPanners[i]->SendDopplerToSourcesIfNeeded();
+    }
+  }
+}
+
+size_t
+AudioListener::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
+{
+  size_t amount = aMallocSizeOf(this);
+  // AudioNodes are tracked separately
+  amount += mPanners.SizeOfExcludingThis(aMallocSizeOf);
+  return amount;
+}
+
+}
+}
+