Better API for the track variants

[Ross-cz]

• What version of Shaka Player are you using? 395cc17

I would like to know easily, whether the track variants has video, audio or subtitle track. Now I have to check for a comma inside codecs. Here is sample output from the method getVariantTracks():
{"id":7,"active":false,"type":"variant","bandwidth":1799135,"language":"en","kind":null,"width":1920,"height":1080,"frameRate":23.976023976023978,"mimeType":"video/mp4","codecs":"avc1.640032, mp4a.40.2","primary":false}

It would be nice to have properties grouped instead of merged.
Btw, is it necessary to output constant property type = 'variant'?

Thanks!

[joeyparrish]

Text tracks are separate from variants. Look for type == 'text'.

The combined codecs in variants is another side-effect of our HLS support, but I think we can probably change it. Would you prefer to see audioCodec and videoCodec in separate fields?

[Ross-cz]

Hi Joey!

Thanks for the type clarification. We need to do the simple audio detection. If there aren't any audio tracks, we could somehow let users know about it.
I think its a great idea to just split codecs. Could you add audioChannelsCount too?

[joeyparrish]

Counting audio channels in DASH is complex. There is another issue filled for that already (#424). I'll update that issue soon with more details.

I'm fairly sure we can split up the codecs, though.

[joeyparrish]

This is now fixed in master, and I intend to cherry-pick it for v2.1.1 in the near future. You can see it now in our nightly build. Please let us know if this meets your needs.

[joeyparrish]

Cherry-picked to v2.1.1.