OfflineAudio 
  inline fun OfflineAudio(    filename: String,     fileMd5: ByteArray,     fileSize: Long,     codec: AudioCodec,     extraData: ByteArray?): OfflineAudio
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构造 OfflineAudio. 有关参数的含义, 参考 Audio.
Since
2.7
使用 OnlineAudio 的信息构造 OfflineAudio.
Since
2.7