Add SUPPLEMENTAL-CODECS support in both DASH and HLS

[ybai001]

Add SUPPLEMENTAL-CODECS support in both DASH and HLS.
-- HLS Specification: https://developer.apple.com/documentation/http-live-streaming/hls-authoring-specification-for-apple-devices-appendixes#The-SUPPLEMENTAL-CODECS-attribute
-- MPEG-DASH Specification: Let me know whether you need a copy of the specification. (See also Dash-Industry-Forum/dash.js#4585)

[tonihei]

Thanks for the contribution! This is definitely something we don't fully parse yet and were planning to add anyway.

I still need to look through some of the changes in more detail to provide comments, but one high-level one already: It would help to understand why the changes to Format are needed exactly. I was under the impression the codecs field directly and unambiguously maps to any fallback baseline codec that can be used instead, so specifying supplementalCodecs seems redundant? And the videoRange field (if needed) should probably be written into the existing Format.colorInfo.colorRange instead.

[ybai001]

Thanks for quick reply. I think you are right. I'll refine the code to remove the change of Format.java and update corresponding files.

[ybai001]

There is a problem here. Because I move this part of logic from HlsMediaPeriod.java to HlsPlaylistParser.java and the "codecs" is a string that includes both audio and video codec name, I can't update the codecs directly. I need to refine this part of code again.