[Bug 17673] Define Initialization Data for implementations that choose to support the ISO Base Media File Format

https://www.w3.org/Bugs/Public/show_bug.cgi?id=17673

--- Comment #22 from David Dorwin <ddorwin@google.com> ---
In the telecon today, there was support for focusing on CENC but a desire to
not exclude the possibility of other schemes.

One possibility is to state that the first part of Initialization Data for BMFF
must be a box. Assuming we use PSSHes for CENC, CENC Initialization Data could
be identified from the first first 8 bytes: |size=4|"pssh"|. As long as no
other protection scheme uses 'pssh', there would be no ambiguity.

It was also noted that defining a common CENC system ID and PSSH format is a
separate issue. We can file a separate bug for that once we've decided how to
resolve this bug.

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Received on Tuesday, 20 August 2013 20:23:58 UTC