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• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

MediaCapabilities.decodingInfo() method, part of the 媒体能力 API , returns a promise with the tested media configuration's mediaCapabilitiesInfo ; this contains the three Boolean properties supported , smooth ，和 powerefficient , which describe whether decoding the media described would be supported, smooth, and powerefficient.

句法

mediaCapabilities.decodingInfo(MediaDecodingConfiguration)
					

参数

MediaDecodingConfiguration

有效 MediaDecodingConfiguration dictionary containing a valid media decoding type of file or media-source and a valid media configuration: either an AudioConfiguration 或 VideoConfiguration .

返回值

A Promise fulfilling with a MediaCapabilitiesInfo interface containing three Boolean attributes:

• supported
• smooth
• powerEfficient

异常

A TypeError is raised if the MediaConfiguration passed to the decodingInfo() method is invalid, either because the type is not video or audio, the contentType is not a valid codec MIME type, the media decoding configuration is not a valid value for the media decoding type , or any other error in the media configuration passed to the method, including omitting values required in the media decoding configuration .

范例

//Create media configuration to be tested
const mediaConfig = {
    type : 'file', // or 'media-source'
    audio : {
        contentType : "audio/ogg", // valid content type 
        channels : 2,     // audio channels used by the track
        bitrate : 132700, // number of bits used to encode 1s of audio 
        samplerate : 5200 // number of audio samples making up that 1s. 
     },
};
// check support and performance
navigator.mediaCapabilities.decodingInfo(mediaConfig).then(result => {
    console.log('This configuration is ' +
        (result.supported ? '' : 'not ') + 'supported, ' +
        (result.smooth ? '' : 'not ') + 'smooth, and ' +
        (result.powerEfficient ? '' : 'not ') + 'power efficient.')
});
					

规范

规范	状态	注释
Media Capabilities The definition of 'decodingInfo()' in that specification.	草案	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
decodingInfo	Chrome 66	Edge ≤79	Firefox 63	IE ?	Opera 55	Safari ?	WebView Android 66	Chrome Android 66	Firefox Android 63	Opera Android 48	Safari iOS ?	Samsung Internet Android 9.0

图例

完整支持

完整支持

兼容性未知 ?

兼容性未知

实验。期望将来行为有所改变。

实验。期望将来行为有所改变。

另请参阅

• MediaDecodingConfiguration
• VideoConfiguration
• AudioConfiguration
• MediaCapabilities.encodingInfo()

元数据

• 最后修改： Jul 12, 2020

相关话题

1. MediaCapabilities
2. 方法

   1. decodingInfo()
   2. encodingInfo()