third_party/WebKit/Source/modules/webaudio/AnalyserNode.idl

/*
 * Copyright (C) 2010, Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1.  Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 */

// See https://webaudio.github.io/web-audio-api/#the-analysernode-interface
[
    Constructor(BaseAudioContext context, optional AnalyserOptions options),
    RaisesException=Constructor,
]
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);
};