Audio Track Question

Hey,

I’m actually implementing the possibility of switching audio tracks on my player. I’ve some questions about this :

• How I can be sure that selectAudioLanguage() executed well or failed? It seems to return nothing but I can see that a AdaptionEvent is triggered when I switch audio tracks, but in the data event It doesn’t tell me that it was triggered by an audio track switch action.

• Also, In my DASH manifest, I can see that I have an Accessibility track, but when I call getAudioLanguagesAndRoles, it doesn’t tell me if there is an accessibility track. Is there a way to recognise if my track is an accessibility track ?

• I would like to know If there also a way to get the current Audio track playing by the player? I know by default shaka player will play the main track, but sometimes I have multiple tracks who got main role and by that I dont know which track is playing. Is there an easy way to get the current track ?

Thank you 😃

[vaage]

@fadomire what I would suggest you do is summary the requirements and your proposed solution as a feature request. That request will be reviewed by those on the team who are best equipped to discuss the details. Once the details have been worked-out, the work will be allocated resources as per its priority.

[TheModMaker]

We should extend the kind attribute to also apply to audio tracks based on the Role. So in your case it would be alternate. See section 5.8.5.5 of the DASH spec for these values and their interpretations. We should be careful about duplicate Role elements, since there can be main and another.

As for the Accessibility element, the DASH IOP specifies some values for this. With a @schemeIdUri of urn:mpeg:dash:role:2011: on video the value can be sign, subtitle, or caption; with audio it can be description and enhanced-audio-intelligibility; with text it can be description or caption.

Your @schemeIdUri isn’t specified, but thats allowed. Since we focus on DASH and the DASH IOP, I’d be hesitant to add other specs in. How about adding the properties I described above according to the IOP guidelines?

We could then expose those as kind if Accessibility is present, falling back to Role if there isn’t one. You can get the roles property to get the raw roles.