1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/AudioListener.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,132 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim:set ts=2 sw=2 sts=2 et cindent: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#include "AudioListener.h"
1.11 +#include "AudioContext.h"
1.12 +#include "mozilla/dom/AudioListenerBinding.h"
1.13 +
1.14 +namespace mozilla {
1.15 +namespace dom {
1.16 +
1.17 +NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_1(AudioListener, mContext)
1.18 +
1.19 +NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(AudioListener, AddRef)
1.20 +NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(AudioListener, Release)
1.21 +
1.22 +AudioListener::AudioListener(AudioContext* aContext)
1.23 + : mContext(aContext)
1.24 + , mPosition()
1.25 + , mFrontVector(0., 0., -1.)
1.26 + , mRightVector(1., 0., 0.)
1.27 + , mVelocity()
1.28 + , mDopplerFactor(1.)
1.29 + , mSpeedOfSound(343.3) // meters/second
1.30 +{
1.31 + MOZ_ASSERT(aContext);
1.32 + SetIsDOMBinding();
1.33 +}
1.34 +
1.35 +JSObject*
1.36 +AudioListener::WrapObject(JSContext* aCx)
1.37 +{
1.38 + return AudioListenerBinding::Wrap(aCx, this);
1.39 +}
1.40 +
1.41 +void
1.42 +AudioListener::SetOrientation(double aX, double aY, double aZ,
1.43 + double aXUp, double aYUp, double aZUp)
1.44 +{
1.45 + ThreeDPoint front(aX, aY, aZ);
1.46 + // The panning effect and the azimuth and elevation calculation in the Web
1.47 + // Audio spec becomes undefined with linearly dependent vectors, so keep
1.48 + // existing state in these situations.
1.49 + if (front.IsZero()) {
1.50 + return;
1.51 + }
1.52 + // Normalize before using CrossProduct() to avoid overflow.
1.53 + front.Normalize();
1.54 + ThreeDPoint up(aXUp, aYUp, aZUp);
1.55 + if (up.IsZero()) {
1.56 + return;
1.57 + }
1.58 + up.Normalize();
1.59 + ThreeDPoint right = front.CrossProduct(up);
1.60 + if (right.IsZero()) {
1.61 + return;
1.62 + }
1.63 + right.Normalize();
1.64 +
1.65 + if (!mFrontVector.FuzzyEqual(front)) {
1.66 + mFrontVector = front;
1.67 + SendThreeDPointParameterToStream(PannerNode::LISTENER_FRONT_VECTOR, front);
1.68 + }
1.69 + if (!mRightVector.FuzzyEqual(right)) {
1.70 + mRightVector = right;
1.71 + SendThreeDPointParameterToStream(PannerNode::LISTENER_RIGHT_VECTOR, right);
1.72 + }
1.73 +}
1.74 +
1.75 +void
1.76 +AudioListener::RegisterPannerNode(PannerNode* aPannerNode)
1.77 +{
1.78 + mPanners.AppendElement(aPannerNode->asWeakPtr());
1.79 +
1.80 + // Let the panner node know about our parameters
1.81 + aPannerNode->SendThreeDPointParameterToStream(PannerNode::LISTENER_POSITION, mPosition);
1.82 + aPannerNode->SendThreeDPointParameterToStream(PannerNode::LISTENER_FRONT_VECTOR, mFrontVector);
1.83 + aPannerNode->SendThreeDPointParameterToStream(PannerNode::LISTENER_RIGHT_VECTOR, mRightVector);
1.84 + aPannerNode->SendThreeDPointParameterToStream(PannerNode::LISTENER_VELOCITY, mVelocity);
1.85 + aPannerNode->SendDoubleParameterToStream(PannerNode::LISTENER_DOPPLER_FACTOR, mDopplerFactor);
1.86 + aPannerNode->SendDoubleParameterToStream(PannerNode::LISTENER_SPEED_OF_SOUND, mSpeedOfSound);
1.87 + UpdatePannersVelocity();
1.88 +}
1.89 +
1.90 +void AudioListener::UnregisterPannerNode(PannerNode* aPannerNode)
1.91 +{
1.92 + mPanners.RemoveElement(aPannerNode);
1.93 +}
1.94 +
1.95 +void
1.96 +AudioListener::SendDoubleParameterToStream(uint32_t aIndex, double aValue)
1.97 +{
1.98 + for (uint32_t i = 0; i < mPanners.Length(); ++i) {
1.99 + if (mPanners[i]) {
1.100 + mPanners[i]->SendDoubleParameterToStream(aIndex, aValue);
1.101 + }
1.102 + }
1.103 +}
1.104 +
1.105 +void
1.106 +AudioListener::SendThreeDPointParameterToStream(uint32_t aIndex, const ThreeDPoint& aValue)
1.107 +{
1.108 + for (uint32_t i = 0; i < mPanners.Length(); ++i) {
1.109 + if (mPanners[i]) {
1.110 + mPanners[i]->SendThreeDPointParameterToStream(aIndex, aValue);
1.111 + }
1.112 + }
1.113 +}
1.114 +
1.115 +void AudioListener::UpdatePannersVelocity()
1.116 +{
1.117 + for (uint32_t i = 0; i < mPanners.Length(); ++i) {
1.118 + if (mPanners[i]) {
1.119 + mPanners[i]->SendDopplerToSourcesIfNeeded();
1.120 + }
1.121 + }
1.122 +}
1.123 +
1.124 +size_t
1.125 +AudioListener::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
1.126 +{
1.127 + size_t amount = aMallocSizeOf(this);
1.128 + // AudioNodes are tracked separately
1.129 + amount += mPanners.SizeOfExcludingThis(aMallocSizeOf);
1.130 + return amount;
1.131 +}
1.132 +
1.133 +}
1.134 +}
1.135 +
