Add Bitrate, Bitdepth and Decoder information to playing track

[orenskl]

Add track technical metadata (bitrate, bitdepth, decoder) to the track model exposed via the API

See also here : jaedb/Iris#808

Using Mopidy-tidal (0.2.7) as a backend I get this:

{
   "id" : 1,
   "jsonrpc" : "2.0",
   "result" : {
      "__model__" : "Track",
      "album" : {
         "__model__" : "Album",
         "artists" : [
            {
               "__model__" : "Artist",
               "name" : "Amy Winehouse",
               "uri" : "tidal:artist:15796"
            }
         ],
         "name" : "Back To Black",
         "uri" : "tidal:album:2798956"
      },
      "artists" : [
         {
            "__model__" : "Artist",
            "name" : "Amy Winehouse",
            "uri" : "tidal:artist:15796"
         }
      ],
      "disc_no" : 1,
      "length" : 240000,
      "name" : "Back To Black",
      "track_no" : 5,
      "uri" : "tidal:track:15796:2798956:2798961"
   }
}

Which means that bitrate is not exposed by the backend ?

[tehkillerbee]

@blacklight Do we have additional fields (bitrate etc.) exposed by tidalapi v0.7.x?

[2e0byo]

No, sadly, although we do have replay_gain!. In the long run it would be nice if mopidy itself were replay-gain aware.

Here's a random track:

>>> vars(tracks[0])
{'session': <tidalapi.session.Session at 0x7f65b664c730>,
 'requests': <tidalapi.request.Requests at 0x7f65b58e8cd0>,
 'album': <tidalapi.album.Album at 0x7f65b58ea200>,
 'id': 66236919,
 'name': 'Electric For Life',
 'duration': 28,
 'available': True,
 'tidal_release_date': datetime.datetime(2016, 10, 21, 0, 0, tzinfo=tzutc()),
 'user_date_added': None,
 'track_num': 1,
 'volume_num': 1,
 'explicit': False,
 'popularity': 0,
 'artist': <tidalapi.artist.Artist at 0x7f65b58e9c30>,
 'artists': [<tidalapi.artist.Artist at 0x7f65b58ea560>],
 'type': None,
 'artist_roles': None,
 'replay_gain': -9.88,
 'peak': 0.891325,
 'isrc': 'NLF711608256',
 'copyright': 'Garuda under exclusive license to Armada Music B.V.',
 'audio_quality': <Quality.lossless: 'LOSSLESS'>,
 'version': 'Intro'}

Audio quality is an enum. Per the linked issue Mopidy's track model only supports bitrate anyhow, so I don't think we could add the other data, even if tidalapi provided it. @orenskl you might want to open with tidalapi?

[orenskl]

Done.

tamland/python-tidal#114