interface EventTarget {
  void addEventListener(DOMString type, EventListener? callback, optional boolean capture = false);
  void removeEventListener(DOMString type, EventListener? callback, optional boolean capture = false);
  boolean dispatchEvent(Event event);
};

/*
callback interface EventListener {
  void handleEvent(Event event);
};
*/
// Callback interfaces are not supported yet, but that's ok
interface EventListener {};

callback DecodeErrorCallback = void (DOMException error);
callback DecodeSuccessCallback = void (AudioBuffer decodedData);

interface BaseAudioContext : EventTarget {
    readonly        attribute AudioDestinationNode destination;
    readonly        attribute float                sampleRate;
    readonly        attribute double               currentTime;
    readonly        attribute AudioListener        listener;
    readonly        attribute AudioContextState    state;
    readonly        attribute double               baseLatency;
    Promise          resume ();
                    attribute EventHandler         onstatechange;
    AudioBuffer            createBuffer (unsigned long numberOfChannels, unsigned long length, float sampleRate);
    Promise   decodeAudioData (ArrayBuffer audioData, optional DecodeSuccessCallback successCallback, optional DecodeErrorCallback errorCallback);
    AudioBufferSourceNode  createBufferSource ();
    ConstantSourceNode     createConstantSource ();
    ScriptProcessorNode    createScriptProcessor (optional unsigned long bufferSize = 0
              , optional unsigned long numberOfInputChannels = 2
              , optional unsigned long numberOfOutputChannels = 2
              );
    AnalyserNode           createAnalyser ();
    GainNode               createGain ();
    DelayNode              createDelay (optional double maxDelayTime);
    BiquadFilterNode       createBiquadFilter ();
    IIRFilterNode          createIIRFilter (sequence feedforward, sequence feedback);
    WaveShaperNode         createWaveShaper ();
    PannerNode             createPanner ();
    StereoPannerNode       createStereoPanner ();
    ConvolverNode          createConvolver ();
    ChannelSplitterNode    createChannelSplitter (optional unsigned long numberOfOutputs = 6
              );
    ChannelMergerNode      createChannelMerger (optional unsigned long numberOfInputs = 6
              );
    DynamicsCompressorNode createDynamicsCompressor ();
    OscillatorNode         createOscillator ();
    PeriodicWave           createPeriodicWave (Float32Array real, Float32Array imag, optional PeriodicWaveConstraints constraints);
};

dictionary AudioBufferOptions {
             unsigned long numberOfChannels = 1;
    required unsigned long length;
    required float         sampleRate;
};

[Constructor(AudioBufferOptions options)]
interface AudioBuffer {
    readonly        attribute float         sampleRate;
    readonly        attribute unsigned long length;
    readonly        attribute double        duration;
    readonly        attribute unsigned long numberOfChannels;
    Float32Array getChannelData (unsigned long channel);
    void         copyFromChannel (Float32Array destination, unsigned long channelNumber, optional unsigned long startInChannel = 0
              );
    void         copyToChannel (Float32Array source, unsigned long channelNumber, optional unsigned long startInChannel = 0
              );
};