Prefer stereo streams if user has configured 2.0 in AE

[peak3d]

Description

For media which includes both stereo and multi channel streams we currently select by default the multichannel stream.
For most of our 2.0 users this means that much more data download as required and that extra CPU is used for downmixing.
This PR requests from AE, if we have a pure 2.0 user. If so, prefer stereo streams by default.

Motivation and Context

• reduce unneccessary download bandwidth
• reduce CPU
• reduce risk to be blacklisted from contentproviders (they have to pay the bill)

How Has This Been Tested?

Win10 / amazon addon / baywatch

Types of change

• Bug fix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves existing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

[Jalle19]

Many movies have a stereo commentary track in addition to the main track, I think this would cause problems for such files

[peak3d]

@Jalle19 why should this be an issue? The PR is just changing the "priority" which stream is choosen on startup

Edit, Ok, now I understand, are those streams tagged in any way?
In general the non commentary streams should be tagged as default which have predence.

Can you provide an example stream @Jalle19 ?

Edit2: If a Movie comes with stereo and commentary stereo, how is assured today that the non-commentary is choosen by default?

[wsnipex]

what happens if you have 2.0 speakers, but passthrough enabled? we want multichannel in this case

[FernetMenta]

we discussed this on slack yesterday. don't create a dependency from VP to AE. use playeroptions

[peak3d]

@wsnipex this is covered by AE, if PT is enabled normal behaviour

[peak3d]

@FernetMenta we already have this dependency in VPA, to get passthrough caps
Will this be moved awy in the future too ?

[FernetMenta]

Keep in mind that VP needs to work without audio, i.e. picture in picture. CAudioSinkAE is in change of passthrough caps but not VPA

[peak3d]

Yes, changing.....