1 files changed, 136 insertions, 0 deletions
diff --git a/dom/media/webaudio/AudioListener.cpp b/dom/media/webaudio/AudioListener.cpp
new file mode 100644
index 0000000000..2e00af9764
--- /dev/null
+++ b/dom/media/webaudio/AudioListener.cpp
@@ -0,0 +1,136 @@
+/* -*- 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 "AudioContext.h"
+#include "AudioListener.h"
+#include "MediaTrackGraphImpl.h"
+#include "Tracing.h"
+#include "mozilla/dom/AudioListenerBinding.h"
+
+namespace mozilla::dom {
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(AudioListener, mContext)
+
+AudioListenerEngine::AudioListenerEngine()
+    : mPosition(), mFrontVector(0., 0., -1.), mRightVector(1., 0., 0.) {}
+
+void AudioListenerEngine::RecvListenerEngineEvent(
+    AudioListenerEngine::AudioListenerParameter aParameter,
+    const ThreeDPoint& aValue) {
+  switch (aParameter) {
+    case AudioListenerParameter::POSITION:
+      mPosition = aValue;
+      break;
+    case AudioListenerParameter::FRONT:
+      mFrontVector = aValue;
+      break;
+    case AudioListenerParameter::RIGHT:
+      mRightVector = aValue;
+      break;
+    default:
+      MOZ_CRASH("Not handled");
+  }
+}
+
+const ThreeDPoint& AudioListenerEngine::Position() const { return mPosition; }
+const ThreeDPoint& AudioListenerEngine::FrontVector() const {
+  return mFrontVector;
+}
+const ThreeDPoint& AudioListenerEngine::RightVector() const {
+  return mRightVector;
+}
+
+AudioListener::AudioListener(AudioContext* aContext)
+    : mContext(aContext),
+      mEngine(new AudioListenerEngine()),
+      mPosition(),
+      mFrontVector(0., 0., -1.),
+      mRightVector(1., 0., 0.) {
+  MOZ_ASSERT(aContext);
+}
+
+JSObject* AudioListener::WrapObject(JSContext* aCx,
+                                    JS::Handle<JSObject*> aGivenProto) {
+  return AudioListener_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+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;
+    SendListenerEngineEvent(AudioListenerEngine::AudioListenerParameter::FRONT,
+                            mFrontVector);
+  }
+  if (!mRightVector.FuzzyEqual(right)) {
+    mRightVector = right;
+    SendListenerEngineEvent(AudioListenerEngine::AudioListenerParameter::RIGHT,
+                            mRightVector);
+  }
+}
+
+void AudioListener::SetPosition(double aX, double aY, double aZ) {
+  if (WebAudioUtils::FuzzyEqual(mPosition.x, aX) &&
+      WebAudioUtils::FuzzyEqual(mPosition.y, aY) &&
+      WebAudioUtils::FuzzyEqual(mPosition.z, aZ)) {
+    return;
+  }
+  mPosition.x = aX;
+  mPosition.y = aY;
+  mPosition.z = aZ;
+  SendListenerEngineEvent(AudioListenerEngine::AudioListenerParameter::POSITION,
+                          mPosition);
+}
+
+void AudioListener::SendListenerEngineEvent(
+    AudioListenerEngine::AudioListenerParameter aParameter,
+    const ThreeDPoint& aValue) {
+  class Message final : public ControlMessage {
+   public:
+    Message(AudioListenerEngine* aEngine,
+            AudioListenerEngine::AudioListenerParameter aParameter,
+            const ThreeDPoint& aValue)
+        : ControlMessage(nullptr),
+          mEngine(aEngine),
+          mParameter(aParameter),
+          mValue(aValue) {}
+    void Run() override {
+      TRACE("AudioListener::RecvListenerEngineEvent");
+      mEngine->RecvListenerEngineEvent(mParameter, mValue);
+    }
+    RefPtr<AudioListenerEngine> mEngine;
+    AudioListenerEngine::AudioListenerParameter mParameter;
+    ThreeDPoint mValue;
+  };
+
+  mContext->DestinationTrack()->GraphImpl()->AppendMessage(
+      MakeUnique<Message>(Engine(), aParameter, aValue));
+}
+
+size_t AudioListener::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const {
+  return aMallocSizeOf(this);
+}
+
+}  // namespace mozilla::dom