Additional multi-audio track information

The OTVTrackInfo class contains additional information about audio tracks, each representing an audio Adaptation Set extracted from the stream’s manifest. It provides the following methods:

• isActive() returns true for the selected track, and false for all other audio tracks in the list

• getName() provides a string describing the track (which may be simply the language)

• getLanguage() provides the language code string in either the ISO-639-1 or ISO-639-2 format

• getEncodeType() returns an integer representing the audio encoding (see the reference API of OTVTrackInfo for the various values)

• getCharacteristics() returns a string of track characteristics as advertised in some HLS streams. For audio tracks, this may include "public.accessibility.describes-video"

• getMimeType() will return the MIME type of the audio track

• getAudioChannelCount() will return the number of audio channels in the track 

• getVideoTrackInfos() will return null for audio tracks