PannerNode | Web API

在此页

构造函数
特性
方法
范例
规范
浏览器兼容性
另请参阅
相关话题

PannerNode interface represents the position and behavior of an audio source signal in space. It is an AudioNode audio-processing module describing its position with right-hand Cartesian coordinates, its movement using a velocity vector and its directionality using a directionality cone.

A PannerNode always has exactly one input and one output: the input can be mono or stereo but the output is always stereo (2 channels); you can't have panning effects without at least two audio channels!

The PannerNode brings a spatial position and velocity and a directionality for a given signal.

输入数	`1`
输出数	`1`
通道计数模式	`"clamped-max"`
通道计数	`2`
通道解释	`"speakers"`

构造函数

PannerNode.PannerNode: 创建新的 PannerNode 对象实例。

特性

继承的特性来自其父级， AudioNode .

The orientation and position value are set and retrieved using different syntaxes, since they're stored as AudioParam values. Retrieval is done by accessing, for example, PannerNode.positionX . While setting the same property is done with PannerNode.positionX.value . This is why these values are not marked read only, which is how they appear in the WebIDL.

PannerNode.coneInnerAngle
PannerNode.coneOuterAngle: A double value describing the angle, in degrees, of a cone outside of which the volume will be reduced by a constant value, defined by the coneOuterGain 属性。
PannerNode.coneOuterGain: A double value describing the amount of volume reduction outside the cone defined by the coneOuterAngle attribute. Its default value is 0 , meaning that no sound can be heard.
PannerNode.distanceModel: An enumerated value determining which algorithm to use to reduce the volume of the audio source as it moves away from the listener. Possible values are "linear" , "inverse" and "exponential" 。默认值为 "inverse" .
PannerNode.maxDistance
PannerNode.orientationX: Represents the horizontal position of the audio source's vector in a right-hand cartesian coordinate system. While this AudioParam cannot be directly changed, its value can be altered using its value property. The default is value is 1.
PannerNode.orientationY: Represents the vertical position of the audio source's vector in a right-hand cartesian coordinate system. The default is 0. While this AudioParam cannot be directly changed, its value can be altered using its value property. The default is value is 0.
PannerNode.orientationZ: Represents the longitudinal (back and forth) position of the audio source's vector in a right-hand cartesian coordinate system. The default is 0. While this AudioParam cannot be directly changed, its value can be altered using its value property. The default is value is 0.
PannerNode.panningModel
PannerNode.positionX: Represents the horizontal position of the audio in a right-hand cartesian coordinate system. The default is 0. While this AudioParam cannot be directly changed, its value can be altered using its value property. The default is value is 0.
PannerNode.positionY: Represents the vertical position of the audio in a right-hand cartesian coordinate system. The default is 0. While this AudioParam cannot be directly changed, its value can be altered using its value property. The default is value is 0.
PannerNode.positionZ: Represents the longitudinal (back and forth) position of the audio in a right-hand cartesian coordinate system. The default is 0. While this AudioParam cannot be directly changed, its value can be altered using its value property. The default is value is 0.
PannerNode.refDistance: A double value representing the reference distance for reducing volume as the audio source moves further from the listener. For distances greater than this the volume will be reduced based on rolloffFactor and distanceModel .
PannerNode.rolloffFactor

方法

继承方法来自其父级 AudioNode .

PannerNode.setPosition(): Defines the position of the audio source relative to the listener (represented by an AudioListener object stored in the AudioContext.listener attribute.)

PannerNode.setOrientation()

PannerNode.setVelocity(): Defines the velocity vector of the audio source — how fast it is moving and in what direction. In a previous version of the specification, the PannerNode had a velocity that could pitch up or down AudioBufferSourceNode s connected downstream. This feature was not clearly specified and had a number of issues, so it was removed from the specification.

范例

In the following example, you can see an example of how the createPanner() 方法， AudioListener and PannerNode would be used to control audio spatialisation. Generally you will define the position in 3D space that your audio listener and panner (source) occupy initially, and then update the position of one or both of these as the application is used. You might be moving a character around inside a game world for example, and wanting delivery of audio to change realistically as your character moves closer to or further away from a music player such as a stereo. In the example you can see this being controlled by the functions moveRight() , moveLeft() , etc., which set new values for the panner position via the PositionPanner() 函数。

To see a complete implementation, check out our panner-node example ( view the source code ) — this demo transports you to the 2.5D "Room of metal", where you can play a track on a boom box and then walk around the boom box to see how the sound changes!

Note how we have used some feature detection to either give the browser the newer property values (like AudioListener.forwardX ) for setting position, etc. if it supports those, or older methods (like AudioListener.setOrientation() ) if it still supports those but not the new properties.

// set up listener and panner position information
var WIDTH = window.innerWidth;
var HEIGHT = window.innerHeight;
var xPos = Math.floor(WIDTH/2);
var yPos = Math.floor(HEIGHT/2);
var zPos = 295;
// define other variables
var AudioContext = window.AudioContext || window.webkitAudioContext;
var audioCtx = new AudioContext();
var panner = audioCtx.createPanner();
panner.panningModel = 'HRTF';
panner.distanceModel = 'inverse';
panner.refDistance = 1;
panner.maxDistance = 10000;
panner.rolloffFactor = 1;
panner.coneInnerAngle = 360;
panner.coneOuterAngle = 0;
panner.coneOuterGain = 0;
if(panner.orientationX) {
  panner.orientationX.setValueAtTime(1, audioCtx.currentTime);
  panner.orientationY.setValueAtTime(0, audioCtx.currentTime);
  panner.orientationZ.setValueAtTime(0, audioCtx.currentTime);
} else {
  panner.setOrientation(1,0,0);
}
var listener = audioCtx.listener;
if(listener.forwardX) {
  listener.forwardX.setValueAtTime(0, audioCtx.currentTime);
  listener.forwardY.setValueAtTime(0, audioCtx.currentTime);
  listener.forwardZ.setValueAtTime(-1, audioCtx.currentTime);
  listener.upX.setValueAtTime(0, audioCtx.currentTime);
  listener.upY.setValueAtTime(1, audioCtx.currentTime);
  listener.upZ.setValueAtTime(0, audioCtx.currentTime);
} else {
  listener.setOrientation(0,0,-1,0,1,0);
}
var source;
var play = document.querySelector('.play');
var stop = document.querySelector('.stop');
var boomBox = document.querySelector('.boom-box');
var listenerData = document.querySelector('.listener-data');
var pannerData = document.querySelector('.panner-data');
leftBound = (-xPos) + 50;
rightBound = xPos - 50;
xIterator = WIDTH/150;
// listener will always be in the same place for this demo
if(listener.positionX) {
  listener.positionX.setValueAtTime(xPos, audioCtx.currentTime);
  listener.positionY.setValueAtTime(yPos, audioCtx.currentTime);
  listener.positionZ.setValueAtTime(300, audioCtx.currentTime);
} else {
  listener.setPosition(xPos,yPos,300);
}
listenerData.innerHTML = 'Listener data: X ' + xPos + ' Y ' + yPos + ' Z ' + 300;
// panner will move as the boombox graphic moves around on the screen
function positionPanner() {
  if(panner.positionX) {
    panner.positionX.setValueAtTime(xPos, audioCtx.currentTime);
    panner.positionY.setValueAtTime(yPos, audioCtx.currentTime);
    panner.positionZ.setValueAtTime(zPos, audioCtx.currentTime);
  } else {
    panner.setPosition(xPos,yPos,zPos);
  }
  pannerData.innerHTML = 'Panner data: X ' + xPos + ' Y ' + yPos + ' Z ' + zPos;
}

注意 : In terms of working out what position values to apply to the listener and panner, to make the sound appropriate to what the visuals are doing on screen, there is quite a bit of math involved, but you will soon get used to it with a bit of experimentation.

规范

规范	状态	注释
Web 音频 API The definition of 'PannerNode' in that specification.	工作草案

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`PannerNode`	Chrome 14	Edge ≤18	Firefox 25	IE 不支持 No	Opera 15	Safari 6	WebView Android Yes	Chrome Android 18	Firefox Android 26	Opera Android 14	Safari iOS ?	Samsung Internet Android 1.0
`PannerNode()` 构造函数	Chrome 55	Edge ≤79	Firefox 53	IE 不支持 No	Opera 42	Safari ?	WebView Android 55 注意事项 55 注意事项 Before version 59, the default values were not supported.	Chrome Android 55 注意事项 55 注意事项 Before Chrome 59, the default values were not supported.	Firefox Android 53	Opera Android 42	Safari iOS ?	Samsung Internet Android 6.0 注意事项 6.0 注意事项 Before Samsung Internet 7.0, the default values were not supported.
`coneInnerAngle`	Chrome 14	Edge 12	Firefox 25	IE 不支持 No	Opera 15	Safari 6	WebView Android Yes	Chrome Android 18	Firefox Android 26	Opera Android 14	Safari iOS ?	Samsung Internet Android 1.0
`coneOuterAngle`	Chrome 14	Edge 12	Firefox 25	IE 不支持 No	Opera 15	Safari 6	WebView Android Yes	Chrome Android 18	Firefox Android 26	Opera Android 14	Safari iOS ?	Samsung Internet Android 1.0
`coneOuterGain`	Chrome 14	Edge 12	Firefox 25	IE 不支持 No	Opera 15	Safari 6	WebView Android Yes	Chrome Android 18	Firefox Android 26	Opera Android 14	Safari iOS ?	Samsung Internet Android 1.0
`distanceModel`	Chrome 14	Edge 12	Firefox 25	IE 不支持 No	Opera 15	Safari 6	WebView Android Yes	Chrome Android 18	Firefox Android 26	Opera Android 14	Safari iOS ?	Samsung Internet Android 1.0
`maxDistance`	Chrome 14	Edge 12	Firefox 25	IE 不支持 No	Opera 15	Safari 6	WebView Android Yes	Chrome Android 18	Firefox Android 26	Opera Android 14	Safari iOS ?	Samsung Internet Android 1.0
`orientationX`	Chrome Yes	Edge ≤18	Firefox 50	IE 不支持 No	Opera Yes	Safari 不支持 No	WebView Android Yes	Chrome Android Yes	Firefox Android 50	Opera Android Yes	Safari iOS 不支持 No	Samsung Internet Android Yes
`orientationY`	Chrome Yes	Edge ≤18	Firefox 50	IE 不支持 No	Opera Yes	Safari 不支持 No	WebView Android Yes	Chrome Android Yes	Firefox Android 50	Opera Android Yes	Safari iOS 不支持 No	Samsung Internet Android Yes
`orientationZ`	Chrome Yes	Edge ≤18	Firefox 50	IE 不支持 No	Opera Yes	Safari 不支持 No	WebView Android Yes	Chrome Android Yes	Firefox Android 50	Opera Android Yes	Safari iOS 不支持 No	Samsung Internet Android Yes
`panningModel`	Chrome 14	Edge 12	Firefox 25	IE 不支持 No	Opera 15	Safari 6	WebView Android Yes	Chrome Android 18	Firefox Android 26	Opera Android 14	Safari iOS ?	Samsung Internet Android 1.0
`positionX`	Chrome Yes	Edge ≤18	Firefox 50	IE 不支持 No	Opera Yes	Safari 不支持 No	WebView Android Yes	Chrome Android Yes	Firefox Android 50	Opera Android Yes	Safari iOS 不支持 No	Samsung Internet Android Yes
`positionY`	Chrome Yes	Edge ≤18	Firefox 50	IE 不支持 No	Opera Yes	Safari 不支持 No	WebView Android Yes	Chrome Android Yes	Firefox Android 50	Opera Android Yes	Safari iOS 不支持 No	Samsung Internet Android Yes
`positionZ`	Chrome Yes	Edge ≤18	Firefox 50	IE 不支持 No	Opera Yes	Safari 不支持 No	WebView Android Yes	Chrome Android Yes	Firefox Android 50	Opera Android Yes	Safari iOS 不支持 No	Samsung Internet Android Yes
`refDistance`	Chrome 14	Edge 12	Firefox 25	IE 不支持 No	Opera 15	Safari 6	WebView Android Yes	Chrome Android 18	Firefox Android 26	Opera Android 14	Safari iOS ?	Samsung Internet Android 1.0
`rolloffFactor`	Chrome 14	Edge 12	Firefox 25	IE 不支持 No	Opera 15	Safari 6	WebView Android Yes	Chrome Android 18	Firefox Android 26	Opera Android 14	Safari iOS ?	Samsung Internet Android 1.0
`setOrientation`	Chrome 14	Edge 12	Firefox 25	IE 不支持 No	Opera 15	Safari 6	WebView Android Yes	Chrome Android 18	Firefox Android 26	Opera Android 14	Safari iOS ?	Samsung Internet Android 1.0
`setPosition`	Chrome 14	Edge 12	Firefox 25	IE 不支持 No	Opera 15	Safari 6	WebView Android Yes	Chrome Android 18	Firefox Android 26	Opera Android 14	Safari iOS ?	Samsung Internet Android 1.0
`setVelocity` 弃用	Chrome 不支持 14 — 56	Edge 不支持 12 — 79	Firefox 不支持 25 — 63	IE 不支持 No	Opera 不支持 15 — 43	Safari 6	WebView Android 不支持 ? — 56	Chrome Android 不支持 18 — 56	Firefox Android 不支持 26 — 63	Opera Android 不支持 14 — 43	Safari iOS ?	Samsung Internet Android 不支持 1.0 — 6.0

图例

完整支持
不支持
兼容性未知 ?
弃用。不要用于新网站。

另请参阅

使用 Web 音频 API

元数据

最后修改： 2020 年 3 月 26 日

在此页

构造函数

特性

方法

范例

规范

浏览器兼容性

图例

另请参阅

相关话题