The MediaCapabilities.decodingInfo()
method, part of the Media Capabilities API, returns a promise with the tested media configuration's capabilities info; this contains the three Boolean properties supported
, smooth
, and powerefficient
, which describe whether decoding the media described would be supported, smooth, and powerefficient.
decodingInfo(MediaDecodingConfiguration)
A Promise
fulfilling with an object containing three Boolean attributes:
-
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.
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.
const mediaConfig = {
type : 'file',
audio : {
contentType : "audio/ogg; codecs=vorbis",
channels : 2,
bitrate : 132700,
samplerate : 5200
},
};
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.')
});