[Feature Request] Media3 migration

[lovegaoshi]

What is the need and use case of this feature?
android media3 migration

Describe the ideal solution
migrate to media3

Describe alternatives you've considered
not migrate

Additional context
I've been doing a bit of research on this and here's what I've found:

simply changing all the exoplayer2 parts into their exoplayer3 counterparts compiles and runs as expected: my repo
however to fully utilize media3's capabilities (namely the automatic notification/service management via MediaLibraryService) RNTP needs a good amount of work to migrate into the Service-Connector structure. See google's migration commit
Meanwhile I'm still struggling with implementing a MediaLibraryService for KA to show a notification.

How I can Help
What can you do to help get this feature into production?
Can you assist by working on this feature and creating a Pull Request?
working on it
tbh I'm not looking forward to this as the current AA implementation will also need a good amount of refactoring; I'm so confused with "properly" migrating KA that I'm more leaning towards a rewrite based off of UAMP at this point

[lovegaoshi]

my biggest uncertainty right now is how to specify UA, as MediaController does not pass MediaSource but MediaItem; seems doable by
androidx/media#125 (comment)

[lovegaoshi]

managed to have a barebones KA media3 skeleton:
https://github.com/lovegaoshi/KotlinAudio3

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