1229516 - CDM host is unable to load Adobe CDM on Windows XP

Status: RESOLVED WORKSFORME

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

Description

[Chris Peterson [:cpeterson]]

Bob, can you take a look at this problem? cpearce thought you would be the right person. We'd like to use Adobe's CDM to decode unencrypted H.264 and AAC (bug 1210231), but the CDM fails to load on XP.

This bug will block EME when Adobe starts working to support DRM on XP.

Comment 1

[Bob Owen (:bobowen)]

(In reply to Chris Peterson [:cpeterson] from comment #0)
> Bob, can you take a look at this problem? cpearce thought you would be the
> right person. We'd like to use Adobe's CDM to decode unencrypted H.264 and
> AAC (bug 1210231), but the CDM fails to load on XP.
> 
> This bug will block EME when Adobe starts working to support DRM on XP.

I'll see what I can find.

Comment 2

[Bob Owen (:bobowen)]

Hi Chris - is there something extra I need to do in order to test this on XP?
All of the prefs I can spot seem to be enabled.

I can't even get your clearkey mse demo working on Nightly with the sandbox disabled.

openh264 GMP works fine with the sandbox, so the basic GMP mechanics must be working.

Comment 3

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

I have determined that the child process is crashing in GMPChild::ProcessingError() with a MOZ_CRASH, with aReason="(msgtype=0x6A0003,name=PGMPContent::Msg_PGMPDecryptorConstructor) Processing error: message was deserialized, but the handler returned false (indicating failure)".

My guess would be that the Adobe GMP's exported GMPGetAPI() function is refusing to return a GMPDecryptor object. Not sure why yet, but I'd guess they're calling some function that checks the Windows version.

We've also determined that the Adobe GMP can be used for unencrypted H.264 and AAC decoding on Windows XP; we must not be hitting the code in the GMP which checks the Windows version.

Comment 4

[Chris Peterson [:cpeterson]]

Fixed by the work to support unencrypted playback on XP for bug 1210231.