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Feature: Implement support for LL-HLS #EXT-X-PRELOAD-HINT part loading #6356

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iamboorrito
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This PR will...

Add support for EXT-X-PRELOAD-HINT via state machine fragment-preloader.

Why is this Pull Request needed?

Reduce some latency for low latency mode by making preemptive requests.

Are there any points in the code the reviewer needs to double check?

Resolves issues:

To resolve #3988

Checklist

  • changes have been done against master branch, and PR does not conflict
  • new unit / functional tests have been added (whenever applicable)
  • API or design changes are documented in API.md

@iamboorrito
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I started to clean up the fragment-preloader

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@robwalch robwalch left a comment

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I'd be happy to mark this for milestone v1.6.0 if others using HLS.js for Low-Latency HLS would preview this branch and let us know what kind or results they get compared to latest. Branch preview URL: https://feature-preload-hint.hls-js-4zn.pages.dev/

I can see us using FragmentPreloader to tackle byte-range addressing (#5767 chunked-transfer interop) in the future. Thanks for laying the ground work!

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Implement support for LL-HLS #EXT-X-PRELOAD-HINT part loading
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