[supplementary_audio_descriptor.MixType]
Bits = 1
0 = supplementary stream
1 = complete and independent stream

[supplementary_audio_descriptor.Class]
Bits = 5
0 = main audio
1 = audio description for the visually impaired
2 = clean audio for the hearing impaired
3 = spoken subtitles for the visually impaired
4 = dependent parametric data stream
