The Tor Browser: content/media/webaudio/OscillatorNode.h@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* vim:set ts=2 sw=2 sts=2 et cindent: */

     3 /* This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #ifndef OscillatorNode_h_

     8 #define OscillatorNode_h_

    10 #include "AudioNode.h"

    11 #include "AudioParam.h"

    12 #include "PeriodicWave.h"

    13 #include "mozilla/dom/OscillatorNodeBinding.h"

    14 #include "mozilla/Preferences.h"

    16 namespace mozilla {

    17 namespace dom {

    19 class AudioContext;

    21 class OscillatorNode : public AudioNode,

    22                        public MainThreadMediaStreamListener

    23 {

    24 public:

    25   explicit OscillatorNode(AudioContext* aContext);

    26   virtual ~OscillatorNode();

    28   NS_DECL_ISUPPORTS_INHERITED

    29   NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(OscillatorNode, AudioNode)

    31   virtual JSObject* WrapObject(JSContext* aCx) MOZ_OVERRIDE;

    33   virtual void DestroyMediaStream() MOZ_OVERRIDE

    34   {

    35     if (mStream) {

    36       mStream->RemoveMainThreadListener(this);

    37     }

    38     AudioNode::DestroyMediaStream();

    39   }

    40   virtual uint16_t NumberOfInputs() const MOZ_FINAL MOZ_OVERRIDE

    41   {

    42     return 0;

    43   }

    45   OscillatorType Type() const

    46   {

    47     return mType;

    48   }

    49   void SetType(OscillatorType aType, ErrorResult& aRv)

    50   {

    51     if (!Preferences::GetBool("media.webaudio.legacy.OscillatorNode")) {

    52       // Do not accept the alternate enum values unless the legacy pref

    53       // has been turned on.

    54       switch (aType) {

    55       case OscillatorType::_0:

    56       case OscillatorType::_1:

    57       case OscillatorType::_2:

    58       case OscillatorType::_3:

    59       case OscillatorType::_4:

    60         // Do nothing in order to emulate setting an invalid enum value.

    61         return;

    62       default:

    63         // Shut up the compiler warning

    64         break;

    65       }

    66     }

    68     // Handle the alternate enum values

    69     switch (aType) {

    70     case OscillatorType::_0: aType = OscillatorType::Sine; break;

    71     case OscillatorType::_1: aType = OscillatorType::Square; break;

    72     case OscillatorType::_2: aType = OscillatorType::Sawtooth; break;

    73     case OscillatorType::_3: aType = OscillatorType::Triangle; break;

    74     case OscillatorType::_4: aType = OscillatorType::Custom; break;

    75     default:

    76       // Shut up the compiler warning

    77       break;

    78     }

    79     if (aType == OscillatorType::Custom) {

    80       // ::Custom can only be set by setPeriodicWave().

    81       // https://github.com/WebAudio/web-audio-api/issues/105 for exception.

    82       aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);

    83       return;

    84     }

    85     mType = aType;

    86     SendTypeToStream();

    87   }

    89   AudioParam* Frequency() const

    90   {

    91     return mFrequency;

    92   }

    93   AudioParam* Detune() const

    94   {

    95     return mDetune;

    96   }

    98   void Start(double aWhen, ErrorResult& aRv);

    99   void NoteOn(double aWhen, ErrorResult& aRv)

   100   {

   101     Start(aWhen, aRv);

   102   }

   103   void Stop(double aWhen, ErrorResult& aRv);

   104   void NoteOff(double aWhen, ErrorResult& aRv)

   105   {

   106     Stop(aWhen, aRv);

   107   }

   108   void SetPeriodicWave(PeriodicWave& aPeriodicWave)

   109   {

   110     mPeriodicWave = &aPeriodicWave;

   111     // SendTypeToStream will call SendPeriodicWaveToStream for us.

   112     mType = OscillatorType::Custom;

   113     SendTypeToStream();

   114   }

   116   IMPL_EVENT_HANDLER(ended)

   118   virtual void NotifyMainThreadStateChanged() MOZ_OVERRIDE;

   120   virtual const char* NodeType() const

   121   {

   122     return "OscillatorNode";

   123   }

   125   virtual size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE;

   126   virtual size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE;

   128 private:

   129   static void SendFrequencyToStream(AudioNode* aNode);

   130   static void SendDetuneToStream(AudioNode* aNode);

   131   void SendTypeToStream();

   132   void SendPeriodicWaveToStream();

   134 private:

   135   OscillatorType mType;

   136   nsRefPtr<PeriodicWave> mPeriodicWave;

   137   nsRefPtr<AudioParam> mFrequency;

   138   nsRefPtr<AudioParam> mDetune;

   139   bool mStartCalled;

   140   bool mStopped;

   141 };

   143 }

   144 }

   146 #endif

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