modules/webaudio/AnalyserNode.idl

/*
 * Copyright (C) 2010, Google Inc. All rights reserved.
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 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
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[
    Conditional=WEB_AUDIO,
] interface AnalyserNode : AudioNode {
    [RaisesException=Setter] attribute unsigned long fftSize;
    readonly attribute unsigned long frequencyBinCount;

    // minDecibels / maxDecibels represent the range to scale the FFT analysis data for conversion to unsigned byte values.
    [RaisesException=Setter] attribute double minDecibels;
    [RaisesException=Setter] attribute double maxDecibels;

    // A value from 0.0 -> 1.0 where 0.0 represents no time averaging with the last analysis frame.
    [RaisesException=Setter] attribute double smoothingTimeConstant;

    // Copies the current frequency data into the passed array.
    // If the array has fewer elements than the frequencyBinCount, the excess elements will be dropped.
    void getFloatFrequencyData(Float32Array array);
    void getByteFrequencyData(Uint8Array array);

    // Real-time waveform data
    void getFloatTimeDomainData(Float32Array array);
    void getByteTimeDomainData(Uint8Array array);
};