Get PlayReady PSSH from <ms:pro> in DASH

[avelad]

Have you read the FAQ and checked for duplicate open issues?
Yes

What version of Shaka Player are you using?
2.5.4

Can you reproduce the issue with our latest release version?
Yes

Can you reproduce the issue with the latest code from master?
Yes

Are you using the demo app or your own custom app?
Both

If custom app, can you reproduce the issue using our demo app?
Yes

What browser and OS are you using?
Edge 18 Windows 10

For embedded devices (smart TVs, etc.), what model and firmware version are you using?

What are the manifest and license server URIs?

I'll send a email with the url and the license server

What did you do?

Tried to played the dash content with playready encryption but it fails.

What did you expect to happen?
Playback to be normal

What actually happened?

I receive this message when trying to play the content .

Shaka Error DRM.FAILED_TO_GENERATE_LICENSE_REQUEST (SystemCode:0x80041301,TypeError: SystemCode:0x80041301,)

I reviewed the issue #1837 but the pssh in the init segment is valid:

[TheModMaker]

I agree the init data looks valid. After some testing, I see the init data we get has duplicate elements, but removing those doesn't seem to fix it. If I reorder the pssh elements so that PlayReady is first, the generateRequest call succeeds, but the license server rejects it with a Service Specific Error. It also works if I remove the other key systems' init data and only pass PlayReady, but I again get the same license server error.

[avelad]

I checked the stream in DashIF Player and works without problem...

[TheModMaker]

When I try in the DashIF Player, I get a 500 error from the license server, the same as Shaka Player.

One thing I notice that may help is DashIF generates a pssh box based on the <mspr:pro> record in the manifest. This avoids the problems from the pssh boxes in the media. We may want to consider adding this to our DASH parser to (a) avoid this error, and (b) request the license earlier.

[joeyparrish]

We have support for <mspr:pro> to get the license server URI (getPlayReadyLicenseUrl in lib/dash/content_protection.js). So we could probably add support for to override the pssh box based on that in the DASH parser, too.

[avelad]

@TheModMaker , I want contribute to add the support, if you can guide me, i can made the changes this week.

I check the file ib/dash/content_protection.js and i thing that the modications should be done in parseElement_.

Parse <mspr:pro> it's easy with const proNode = shaka.util.XmlUtils.findChildrenNS(elem, 'urn:microsoft:playready', 'pro') .map(shaka.util.XmlUtils.getContents); But if I include the field as it is by overwriting the value of psshs, this does not work.

Note: Error 500 is because the license is not valid, but it is a good development.
Sorry for the delay in answering, but I was on vacation.

[TheModMaker]

I think it would be better to do it in convertElements_. The <mspr:pro> element would be a fallback if there is no other init data available.

That contains a PRO object and you need to convert it to a pssh box. Just put the PRO data into the data section of the pssh box (use this system_id):

[4 bytes] total size
[4 bytes] 'pssh'
[4 bytes] flags (0)
[16 bytes] system_id
[4 bytes] data_size
[data_size bytes] data