RealtimeAnalyserNode.idl   [plain text]

/*
 * 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.
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 *    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;
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 */

module audio {
    interface [
        Conditional=WEB_AUDIO,
        JSGenerateToJSObject
    ] RealtimeAnalyserNode : AudioNode {
        attribute unsigned long fftSize
            setter raises(DOMException);
        readonly attribute unsigned long frequencyBinCount;

        // minDecibels / maxDecibels represent the range to scale the FFT analysis data for conversion to unsigned byte values.
        attribute float minDecibels;
        attribute float maxDecibels;

        // A value from 0.0 -> 1.0 where 0.0 represents no time averaging with the last analysis frame.
        attribute float 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(in Float32Array array);
        void getByteFrequencyData(in Uint8Array array);

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