DASH - Add support for Certurl element #8823
Description
Is your feature request related to a problem? Please describe.
FairPlay DRM needs to call a certificateServer as part of the setup. Shaka Player supports this, but only as a configuration parameter.
Describe the solution you'd like
The CPS group has added a new element Certurl that can signal this in the MPD. Shaka Player should extract this from the MPD and use it
Extract from DASH-IF-IOPv5.0.0-Part6 draft 3 from May 16
5.4 Certificate acquisition URL
One or more Certurl elements may be added under the ContentProtection descriptor. It contains the URL for a license server allowing to retrieve a certificate in the format specific to the DRM system that is described by the ContentProtection descriptor. It has the optional attribute @certType that is a string describing the certificate type served by this license server. The meaning of this attribute is DRM specific. When present, it is expected that the device first use the URL under this element for retrieving the certificate. This certificate can then be used in a DRM specific manner for requesting a license using the URL provided under one Authzurl element.