Support for KLV data over HLS

[jacorbello]

Hi there, my company has a use case where we need to be able to parse additional data coming over the HLS stream. Particularly KLV data, which I've determined is coming through stream_type 6, which is currently only parsing AC-3 audio over the 0x6a DVB descriptor.

I was able to start receiving KLV data via the 0x05 descriptor of stream_type 6 locally.

My question: if I were to put in a PR that enables support for this additional metadata stream into the hls.js project, would that be within scope of the project?

[robwalch]

A PR contributing KLV support has been opened in #6674.

• CMAF KLV support via Metadata callback #6674