AudioQuality 
    data class AudioQuality(val id: String, val label: String?, val bitrate: Int, val averageBitrate: Int, val peakBitrate: Int, val codec: String?, val channelCount: Int?) : Quality
Represents an audio quality. Known limitations:
If a quality has never been played, any of its properties missing from the manifest are assumed to be the same as the first played quality (except for bitrate).
Constructors
Properties
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                  The average bitrate in bits per second, or BITRATE_NO_VALUE if unknown or not applicable. The way in which this field is populated depends on the type of media to which the format corresponds:
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                  The number of audio channels, or null if unknown.
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                  The peak bitrate in bits per second, or BITRATE_NO_VALUE if unknown or not applicable. The way in which this field is populated depends on the type of media to which the format corresponds: