1858546 - [wmfme] load external Widevine L1 CDM library

Status: RESOLVED FIXED

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

Description

[Alastor Wu [:alwu]]

Currently we haven't figured out a way to deploy Widevine L1 library on Firefox, this bug is used to handle that and assign the correct library path. In addition, we also need to figure the sandbox restriction for loading the external library.

Comment 1

[Alastor Wu [:alwu]]

After landing bug 1862051, we will be able to get Widevine L1 dll by adding following prefs to all.js

pref("media.gmp-widevinecdm-l1.visible", true);
pref("media.gmp-widevinecdm-l1.enabled", true);
pref("media.gmp-widevinecdm-l1.forceInstall", true);
pref("media.gmp.log.dump", true);
pref("media.gmp.log.level", 0);

Then there will be a gmp-widevinecdm-l1 folder under the $PROFILE. Eg. My Widevine dll is put in C:\mozilla-source\mozilla-unified\obj-x86_64-pc-windows-msvc\tmp\profile-default\gmp-widevinecdm-l1\1.0.2512.1.

Then we need to

1. pass the path of L1 dll to here
2. disable Cig for the CDM process, Widevine L1 can't work with this mitigation enabled.
3. add dll path to mAllowedFilesRead when starting the CDM process (in my testing, I added the code here)
4. add dll path to LPAC to get the permission, like this

In my own testing, I can confirm that Firefox can play Widevine L1 when LPAC is enabled.

Comment 2

[Bob Owen (:bobowen)]

(In reply to Alastor Wu [:alwu] from comment #1)
...

Then we need to

1. pass the path of L1 dll to here
2. disable Cig for the CDM process, Widevine L1 can't work with this mitigation enabled.
3. add dll path to mAllowedFilesRead when starting the CDM process (in my testing, I added the code here)
4. add dll path to LPAC to get the permission, like this

In my own testing, I can confirm that Firefox can play Widevine L1 when LPAC is enabled.

I think that if we do 4 (which seems like the better option), we won't need 3.

Comment 3

[Alastor Wu [:alwu]]

Attachment: Bug 1858546 - part1 : ensure LPAC permission on Widevine L1 path.

Comment 4

[Alastor Wu [:alwu]]

Attachment: Bug 1858546 - part2 : diable Cig for MFCDM process.

Depends on D192888

Comment 5

[Alastor Wu [:alwu]]

Attachment: WIP: Bug 1858546 - part1 : load Widevine L1 dll.

Comment 6

[Alastor Wu [:alwu]]

Attachment: Bug 1858546 - part3 : ensure LPAC permission on Widevine L1 path.

Depends on D192889

Comment 7

[Alastor Wu [:alwu]]

Attachment: Bug 1858546 - part3 : load Wideinve L1 dll.

Depends on D192889

Comment 8

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/8d7666c29292
part1 : ensure LPAC permission on Widevine L1 path. r=bobowen,aosmond
https://hg.mozilla.org/integration/autoland/rev/8db74f3b7aa2
part2 : diable Cig for MFCDM process. r=bobowen
https://hg.mozilla.org/integration/autoland/rev/dde990208a4f
part3 : load Wideinve L1 dll. r=aosmond

Comment 9

[Narcis Beleuzu [:NarcisB]]

Backed out for build bustages

Backout link: https://hg.mozilla.org/integration/autoland/rev/554a2534116aac6e36e7b7afc2c6d9bb2720fee1
Log link: https://treeherder.mozilla.org/logviewer?job_id=436960732&repo=autoland&lineNumber=83402

Comment 10

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/241391f4d50f
part1 : ensure LPAC permission on Widevine L1 path. r=bobowen,aosmond
https://hg.mozilla.org/integration/autoland/rev/7b58ee78cfcd
part2 : diable Cig for MFCDM process. r=bobowen
https://hg.mozilla.org/integration/autoland/rev/c76357a03d76
part3 : load Wideinve L1 dll. r=aosmond

Comment 11

[Natalia Csoregi [:nataliaCs]]

https://hg.mozilla.org/mozilla-central/rev/241391f4d50f
https://hg.mozilla.org/mozilla-central/rev/7b58ee78cfcd
https://hg.mozilla.org/mozilla-central/rev/c76357a03d76