1 /* 2 * Copyright (C) 2010 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 14 * its contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 [ 30 Conditional=WEB_AUDIO 31 ] interface AudioParam { 32 attribute float value; 33 readonly attribute float minValue; 34 readonly attribute float maxValue; 35 readonly attribute float defaultValue; 36 37 readonly attribute DOMString name; 38 39 // FIXME: Could define units constants here (seconds, decibels, cents, etc.)... 40 readonly attribute unsigned short units; 41 42 // Parameter automation. 43 void setValueAtTime(float value, double time); 44 void linearRampToValueAtTime(float value, double time); 45 void exponentialRampToValueAtTime(float value, double time); 46 47 // Exponentially approach the target with a rate having the given time constant. 48 void setTargetAtTime(float target, double time, double timeConstant); 49 50 // Sets an array of arbitrary parameter values starting at time for the given duration. 51 // The number of values will be scaled to fit into the desired duration. 52 void setValueCurveAtTime(Float32Array values, double time, double duration); 53 54 // Cancels all scheduled parameter changes with times greater than or equal to startTime. 55 void cancelScheduledValues(double startTime); 56 57 [MeasureAs=LegacyWebAudio, ImplementedAs=setTargetAtTime] void setTargetValueAtTime(float targetValue, double time, double timeConstant); 58 59 }; 60
