RTCRtpSendParameters

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The WebRTC API's RTCRtpSendParameters dictionary is used to specify the parameters for an RTCRtpSender when calling its setParameters() 方法。

除以下特性外， RTCRtpSendParameters inherits the properties from the RTCRtpParameters 接口。


encodings: An array of RTCRtpEncodingParameters objects, each specifying the parameters for a single codec that could be used to encode the track's media.
transactionId: A string containing a unique ID for the last set of parameters applied; this value is used to ensure that setParameters() can only be called to alter changes made by a specific previous call to getParameters() . Once this parameter is initially set, it cannot be changed.

degradationPreference: Specifies the preferred way the WebRTC layer should handle optimizing bandwidth against quality in constrained-bandwidth situations; the value comes from the RTCDegradationPreference enumerated string type, and the default is balanced .
priority: A string from the RTCPriorityType enumerated type which indicates the encoding's priority. The default value is low .

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

The compatibility table in 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
`RTCRtpSendParameters`	Chrome 69	Edge ≤79	Firefox No 不支持 No Firefox expects an `RTCRtpParameters` object instead.	IE No	Opera ?	Safari ?	WebView Android 69	Chrome Android 69	Firefox Android No 不支持 No Firefox expects an `RTCRtpParameters` object instead.	Opera Android ?	Safari iOS ?	Samsung Internet Android 10.0
`degradationPreference`	Chrome No	Edge No	Firefox No	IE No	Opera ?	Safari ?	WebView Android No	Chrome Android No	Firefox Android No	Opera Android ?	Safari iOS ?	Samsung Internet Android No
`encodings`	Chrome 69	Edge ≤79	Firefox No 不支持 No Firefox uses `RTCRtpParameters.encodings` 代替。	IE No	Opera ?	Safari ?	WebView Android 69	Chrome Android 69	Firefox Android No 不支持 No Firefox uses `RTCRtpParameters.encodings` 代替。	Opera Android ?	Safari iOS ?	Samsung Internet Android 10.0
`priority`	Chrome No	Edge No	Firefox No	IE No	Opera ?	Safari ?	WebView Android No	Chrome Android No	Firefox Android No	Opera Android ?	Safari iOS ?	Samsung Internet Android No
`transactionId`	Chrome 69	Edge ≤79	Firefox No	IE No	Opera ?	Safari ?	WebView Android 69	Chrome Android 69	Firefox Android No	Opera Android ?	Safari iOS ?	Samsung Internet Android 10.0