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• 句法
• 规范
• 浏览器兼容性
• 相关话题

只读 audioLevel 特性为 RTCRtpContributingSource interface indicates the audio level contained in the last RTP packet played from the described source. audioLevel will be the level value defined in [RFC6465] if the RFC 6465 header extension is present, and otherwise null.

句法

var audioLevel = RTCRtpContributingSource.audioLevel
					

值

A double-precision floating-point number which indicates the volume level of the audio in the most recently received RTP packet from the source described by the RTCRtpContributingSource .

This value, which is in the range 0.0 to 1.0, is on a linear scale and its value is defined in dBov, or decibels (overload). This is the amplitude relative to the point at which clipping of the audio begins to occur. A value of 1.0 represents 0 dBov (maximum volume), a value of 0.0 represents silence, and a value of 0.5 represents approximately 6 dB SPL (decibels of sound pressure level) change in the sound pressure level from 0 dBov.

For both RTCRtpContributingSource and RTCRtpSynchronizationSource , the audio level is converted to this form from the values defined in the specifications corresponding to each type of source.

audioLevel may be absent from RTCRtpContributingSource objects, which indicates that no volume level was provided by the source; however, it is required and always available on all RTCRtpSynchronizationSource 对象。

规范

规范	状态	注释
WebRTC 1.0: Real-time Communication Between Browsers The definition of 'audioLevel' in that specification.	候选推荐	初始定义。

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
audioLevel	Chrome 不支持 No	Edge 不支持 No	Firefox 59	IE 不支持 No	Opera 不支持 No	Safari ?	WebView Android 不支持 No	Chrome Android 不支持 No	Firefox Android 59	Opera Android 不支持 No	Safari iOS ?	Samsung Internet Android 不支持 No

图例

完整支持

完整支持

不支持

不支持

兼容性未知 ?

兼容性未知

用户必须明确启用此特征。

用户必须明确启用此特征。

元数据

• 最后修改： 2019 年 3 月 23 日

相关话题

1. RTCRtpContributingSource
2. 特性

   1. audioLevel
   2. rtpTimestamp
   3. source
   4. timestamp