1851070 - [wmfme] mfpmp process still leak on Windows 10

Status: RESOLVED FIXED

(Core :: Audio/Video: Playback, defect, P2)

Description

[Alastor Wu [:alwu]]

Bug 1842706 fixed the mfpmp process leak for Windows 11, but it doesn't get fixed on Windows 10. Need more investigation to see what happened.

---

STR.

1. Set the preferences media.eme.playready.enabled=true and media.wmf.media-engine.enabled=1
2. Open another new tab, navigating to the https://refapp.hbbtv.org/dash/test_dashjs_sl3000.html?video=sl2000b
3. Close the tab containing the test page

Expected.
4. Open Process Explorer and Firefox should not have any existingmfpmp process

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The severity field is not set for this bug.
:jimm, could you have a look please?

For more information, please visit BugBot documentation.

Comment 2

[Alastor Wu [:alwu]]

As mfpmp process would only be used on software decryption, but software decryption (SL2000) is not our main target and we already have Widevine L3 for that. Therefore, I'm going to disable SL2000 on Windows 10.

Comment 3

[Alastor Wu [:alwu]]

Attachment: Bug 1851070 - only provide hw decryption on Windows 10.

When using SW decryption, the mfpmp process would be used by the media
foundation for decyption. However, on Windows 10, the mfpmp process
would remain alive even if all media foundation related process has been
clear. We've confirmed this issue with Microsoft, they said the issue is
caused by internal cycle reference in the media foundation, and the
solution only exists on Windows 11 and they have no plan to backport it
to Windows 10.

In order to avoid this issue, we will only allow HW decryption on
Windows 10 via the media foudation.

This patch does two things,

(1) only return the HWDRM capabilities
This allows we compare the correct codec types, encyption schemes,
session types with the request candidates.

(2) force to use hardware robustness when initializing a CDM
After ensuring the candidate's request is supported, we would internally
use hardware robustness to create a HWCDM to avoid the problem.

Comment 4

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/3cd293e8be73
only provide hw decryption on Windows 10. r=jolin

Comment 5

[Norisz Fay [:noriszfay]]

https://hg.mozilla.org/mozilla-central/rev/3cd293e8be73