1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/OscillatorNode.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,147 @@
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 +#ifndef OscillatorNode_h_
1.11 +#define OscillatorNode_h_
1.12 +
1.13 +#include "AudioNode.h"
1.14 +#include "AudioParam.h"
1.15 +#include "PeriodicWave.h"
1.16 +#include "mozilla/dom/OscillatorNodeBinding.h"
1.17 +#include "mozilla/Preferences.h"
1.18 +
1.19 +namespace mozilla {
1.20 +namespace dom {
1.21 +
1.22 +class AudioContext;
1.23 +
1.24 +class OscillatorNode : public AudioNode,
1.25 + public MainThreadMediaStreamListener
1.26 +{
1.27 +public:
1.28 + explicit OscillatorNode(AudioContext* aContext);
1.29 + virtual ~OscillatorNode();
1.30 +
1.31 + NS_DECL_ISUPPORTS_INHERITED
1.32 + NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(OscillatorNode, AudioNode)
1.33 +
1.34 + virtual JSObject* WrapObject(JSContext* aCx) MOZ_OVERRIDE;
1.35 +
1.36 + virtual void DestroyMediaStream() MOZ_OVERRIDE
1.37 + {
1.38 + if (mStream) {
1.39 + mStream->RemoveMainThreadListener(this);
1.40 + }
1.41 + AudioNode::DestroyMediaStream();
1.42 + }
1.43 + virtual uint16_t NumberOfInputs() const MOZ_FINAL MOZ_OVERRIDE
1.44 + {
1.45 + return 0;
1.46 + }
1.47 +
1.48 + OscillatorType Type() const
1.49 + {
1.50 + return mType;
1.51 + }
1.52 + void SetType(OscillatorType aType, ErrorResult& aRv)
1.53 + {
1.54 + if (!Preferences::GetBool("media.webaudio.legacy.OscillatorNode")) {
1.55 + // Do not accept the alternate enum values unless the legacy pref
1.56 + // has been turned on.
1.57 + switch (aType) {
1.58 + case OscillatorType::_0:
1.59 + case OscillatorType::_1:
1.60 + case OscillatorType::_2:
1.61 + case OscillatorType::_3:
1.62 + case OscillatorType::_4:
1.63 + // Do nothing in order to emulate setting an invalid enum value.
1.64 + return;
1.65 + default:
1.66 + // Shut up the compiler warning
1.67 + break;
1.68 + }
1.69 + }
1.70 +
1.71 + // Handle the alternate enum values
1.72 + switch (aType) {
1.73 + case OscillatorType::_0: aType = OscillatorType::Sine; break;
1.74 + case OscillatorType::_1: aType = OscillatorType::Square; break;
1.75 + case OscillatorType::_2: aType = OscillatorType::Sawtooth; break;
1.76 + case OscillatorType::_3: aType = OscillatorType::Triangle; break;
1.77 + case OscillatorType::_4: aType = OscillatorType::Custom; break;
1.78 + default:
1.79 + // Shut up the compiler warning
1.80 + break;
1.81 + }
1.82 + if (aType == OscillatorType::Custom) {
1.83 + // ::Custom can only be set by setPeriodicWave().
1.84 + // https://github.com/WebAudio/web-audio-api/issues/105 for exception.
1.85 + aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
1.86 + return;
1.87 + }
1.88 + mType = aType;
1.89 + SendTypeToStream();
1.90 + }
1.91 +
1.92 + AudioParam* Frequency() const
1.93 + {
1.94 + return mFrequency;
1.95 + }
1.96 + AudioParam* Detune() const
1.97 + {
1.98 + return mDetune;
1.99 + }
1.100 +
1.101 + void Start(double aWhen, ErrorResult& aRv);
1.102 + void NoteOn(double aWhen, ErrorResult& aRv)
1.103 + {
1.104 + Start(aWhen, aRv);
1.105 + }
1.106 + void Stop(double aWhen, ErrorResult& aRv);
1.107 + void NoteOff(double aWhen, ErrorResult& aRv)
1.108 + {
1.109 + Stop(aWhen, aRv);
1.110 + }
1.111 + void SetPeriodicWave(PeriodicWave& aPeriodicWave)
1.112 + {
1.113 + mPeriodicWave = &aPeriodicWave;
1.114 + // SendTypeToStream will call SendPeriodicWaveToStream for us.
1.115 + mType = OscillatorType::Custom;
1.116 + SendTypeToStream();
1.117 + }
1.118 +
1.119 + IMPL_EVENT_HANDLER(ended)
1.120 +
1.121 + virtual void NotifyMainThreadStateChanged() MOZ_OVERRIDE;
1.122 +
1.123 + virtual const char* NodeType() const
1.124 + {
1.125 + return "OscillatorNode";
1.126 + }
1.127 +
1.128 + virtual size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE;
1.129 + virtual size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE;
1.130 +
1.131 +private:
1.132 + static void SendFrequencyToStream(AudioNode* aNode);
1.133 + static void SendDetuneToStream(AudioNode* aNode);
1.134 + void SendTypeToStream();
1.135 + void SendPeriodicWaveToStream();
1.136 +
1.137 +private:
1.138 + OscillatorType mType;
1.139 + nsRefPtr<PeriodicWave> mPeriodicWave;
1.140 + nsRefPtr<AudioParam> mFrequency;
1.141 + nsRefPtr<AudioParam> mDetune;
1.142 + bool mStartCalled;
1.143 + bool mStopped;
1.144 +};
1.145 +
1.146 +}
1.147 +}
1.148 +
1.149 +#endif
1.150 +
