Clear Key/CDM SAMPLE-AES fMP4 through Widevine

[botengyao]

What do you want to do with Hls.js?
I want to use Clear Key to play sample-aes cbcs encrypted video through Widevine. How can I use Clear Key to decrypt that through hls.js? Can you provide an example?

I noticed that we can config a widevineLicenseUrl, but if we use Clear Key do I need to config that? Thanks in advance!

[itsjamie]

Hello @calmbryan!

At this point, there isn't a clear path (pardon the pun) to use Clear Key with hls.js.

We don't implement the org.w3.clearkey EME checks.

So, if you wanted to implement this yourself, you would need to change the EMEController in hls.js to request key systems for org.w3.clearkey in addition to the Widevine CDM (Content Decryption Module), and then implement the encrypted event handler to do the exchange with the Encrypted Media Extensions API for ClearKey.

The spec for implementation can be found here; https://www.w3.org/TR/encrypted-media/#clear-key

Of course, if you were to implement this, would love a pull request with the implementation!

Sorry, this likely wasn't the news you wanted to hear.

[botengyao]

Thanks @itsjamie! I will try to make it work in my project at first and then a PR is possible.

[botengyao]

Hi @itsjamie, I want to add Clear Key check support in this #2923 , and I also notice a PlayReady PR #1918 and /feature/v1.0.0 branch. I am a little confused about the project plan. Which branch should I merge in? Do we have a clear API config design for the EME usage? Thanks!

[itsjamie]

The feature/v1.0.0 branch would be the best branch to work from for your PR.

There is not a solidified config for DRM config changes proposed.

I had an alternative approach for v1 that I proposed that has been scratched in favour of maintaining the CDM implementations inside hls.js EME controller.

For ClearKey you should be able to add support to the EME core controller without many top level config changes.

[botengyao]

Thanks! I will take a look for the related conversation. I am thinking that an overall config proposal is helpful if we add different DRMs.

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