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• 特性
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

MediaCapabilitiesInfo 接口在 媒体能力 API is made available when the promise returned by the MediaCapabilities.encodingInfo() or MediaCapabilities.decodingInfo() methods of the MediaCapabilities interface fulfills, providing information as to whether the media type is supported, and whether encoding or decoding such media would be smooth and power efficient.

特性

MediaCapabilitiesInfo interface contains three Boolean attribues:

• supported : Given the properties defined in the MediaConfiguration , can the specified piece of media content be encoded (if MediaEncodingConfiguration is set) or decode (if MediaDecodingConfiguration is set) at all? If yes, supported is true . Otherwise, it is false .
• smooth : Given the properties defined in the MediaConfiguration , will the playback of the specified piece of media be high quality? Will it be smooth?  If supported is true , and playback will be smooth, smooth is true , Otherwise, is it false.
• powerEfficient : Given the properties defined in the MediaConfiguration , will the playback of the specified piece of media be power efficient? If supported is true , and playback will be power efficient, powerEfficient is true , Otherwise, is it false.

Browsers will report a supported media configuration as smooth and powerEfficient until stats on this device have been recorded. All supported audio codecs are reported to be power efficient.

范例

// MediaConfiguration to be tested
const mediaConfig = {
    type : 'file',
    audio : {
        contentType : "audio/ogg",
        channels : 2,
        bitrate : 132700,
        samplerate : 5200
     },
};
// check support and performance
navigator.mediaCapabilities.decodingInfo(mediaConfig).then(result => { // result contains the media capabilities information
    console.log('This configuration is ' +
        (result.supported ? '' : 'not ') + 'supported, ' +             // Can the media, as configured, be decoded by the user agent
        (result.smooth ? '' : 'not ') + 'smooth, and ' +               // is it smooth?
        (result.powerEfficient ? '' : 'not ') + 'power efficient.')    // is it power efficient?
});
					

规范

规范	状态	注释
Media Capabilities The definition of 'MediaCapabilitiesInfo' 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
MediaCapabilitiesInfo	Chrome 66	Edge ≤79	Firefox 63	IE ?	Opera ?	Safari ?	WebView Android 66	Chrome Android 66	Firefox Android 63	Opera Android ?	Safari iOS ?	Samsung Internet Android 9.0
powerEfficient	Chrome 66	Edge ≤79	Firefox 63	IE ?	Opera ?	Safari ?	WebView Android 66	Chrome Android 66	Firefox Android 63	Opera Android ?	Safari iOS ?	Samsung Internet Android 9.0
smooth	Chrome 66	Edge ≤79	Firefox 63	IE ?	Opera ?	Safari ?	WebView Android 66	Chrome Android 66	Firefox Android 63	Opera Android ?	Safari iOS ?	Samsung Internet Android 9.0
supported	Chrome 66	Edge ≤79	Firefox 63	IE ?	Opera ?	Safari ?	WebView Android 66	Chrome Android 66	Firefox Android 63	Opera Android ?	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

• MediaConfiguration
• MediaCapabilities.encodingInfo()
• MediaCapabilities.decodingInfo()

元数据

• 最后修改： Nov 14, 2019

相关话题

1. 媒体能力 API
2. MediaCapabilitiesInfo
3. Related pages for Media Capabilities API

   1. MediaCapabilities
   2. Screen
   3. ScreenLuminance
   4. mediaCapabilities.decodingInfo()
   5. mediaCapabilities.encodingInfo()