AudioParam
是
interface
,
AudioNode
(
GainNode.gain
)实现了此接口.
AudioParam
有两种类型:
1.a-rate AudioParam 实时更改的
2.k-rate AudioParam 初始化设置的
属性
| 属性 | 描述 |
|---|---|
| AudioParam.defaultValue | 初始化的音量 |
| AudioParam.maxValue | 最大值 |
| AudioParam.minValue | 最小值 |
| AudioParam.value | 当前的值,通过defaultValue初始化 |
方法
| 方法 | 描述 |
|---|---|
| AudioParam.setValueAtTime() |
改变当前值,传入 |
| AudioParam.linearRampToValueAtTime() | 线性更改当前值 |
| AudioParam.exponentialRampToValueAtTime() | 指数更改当前值 |
| AudioParam.setTargetAtTime() | |
| AudioParam.setValueCurveAtTime() | |
| AudioParam.cancelScheduledValues() | |
| AudioParam.cancelAndHoldAtTime() |
样例
1.a-rate AudioParam
var AudioContext = window.AudioContext || window.webkitAudioContext;
var audioCtx = new AudioContext();
var gainNode = audioCtx.createGain();
gainNode.gain.value = 0;
2.k-rate AudioParam’
var AudioContext = window.AudioContext || window.webkitAudioContext;
var audioCtx = new AudioContext();
var biquadFilter = audioCtx.createBiquadFilter();
biquadFilter.type = "lowshelf";
biquadFilter.frequency.value = 1000;
biquadFilter.gain.value = 25;
参考:
https://developer.mozilla.org/en-US/docs/Web/API/AudioParam
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