1310654 - Widevine CDM is not included in navigator.mimeTypes

Status: RESOLVED WONTFIX

(Core :: Audio/Video: Playback, defect, P3)

Description

[Benjamin Smedberg]

In Chrome, the Widevine CDM is included in navigator.mimeTypes. This may be a signal for video sites to use Widevine instead of Silverlight, and so it may be necessary for us to follow suit in order to deprecate silverlight.

Anthony, are you the right person to make a decision about this? Do we need to test some real-life video sites that currently use widevine in Chrome but silverlight in Firefox to see whether change has any positive effect?

cpeterson NI? as this may be worth tracking in terms of silverlight deprecation.

Comment 1

[Benjamin Smedberg]

In particular:

navigator.mimeTypes[0]:
> MimeType {type: "application/x-ppapi-widevine-cdm", suffixes: "", description: "Widevine Content Decryption Module", enabledPlugin: Plugin}

navigator.mimeTypes[0].enabledPlugin:
> Plugin {0: MimeType, name: "Widevine Content Decryption Module", filename: "widevinecdmadapter.dll", description: "Enables Widevine licenses for playback of HTML audio/video content. (version: 1.4.8.903)", length: 1}

Comment 2

[Chris Peterson [:cpeterson]]

Interesting. This is probably not a big compatibility problem because the navigator.requestMediaKeySystemAccess() API is the standard way to query for CDM support. But since Chrome exposes Widevine in navigator.mimeTypes, we should too.

Comment 3

[Anthony Jones (:ajones, :kentuckyfriedtakahe, :k17e)]

That probably indicates support for legacy Widevine.

Comment 4

[Anthony Jones (:ajones, :kentuckyfriedtakahe, :k17e)]

Chris - is this bug invalid?

Comment 5

[Chris Pearce [:cpearce (Not reading bugmail)]]

I expect this is an artifact of how Chrome implement their EME Widevine CDM; they have a PPAPI plugin (widevinecdmadapter.dll) which adapts to the Chromium CDM interface which is implemented by the CDM DLL (widevinecdm.dll). As cpeterson pointed out, EME provides a standardized API surface for JS to query for and instantiate CDMs. I don't expect we need to implement this.