The 'webkitkeyneeded' and 'encrypted' events send similar data, but
they were incompatible with each other and our transform handling.
This makes our polyfill produce the same format as the browser for
cases where the browser may only fire the old event. This also makes
our utilities work with the new format.
The 'webkitkeyneeded' event was a length-prefixed UTF-16 string while
the 'encrypted' event was just a UTF-8 string.
This also makes a breaking change in the transform callback to pass the
init data type. This shouldn't break anyone that only uses the first
argument; the second argument was mainly added so we could have the
default transform work without knowing anything.
This change could also break people who use custom transform functions.
The init data format is changing, which could break people who read
it directly. If they follow the tutorial and use our utilities, it
shouldn't break. This also updates the tutorial to match the new format
and be more clear about the format.
Fixes#2214
Change-Id: I006382028e828e31e20e085114fd7fd85c0e1eaa
Now there is a generic callback to transform the init data before
passing it to the browser. This can be used by apps to use a custom
content ID in FairPlay content. This also adds some utilities to help
in writing these functions and moves the default behavior to DrmEngine.
Closes#1951
Change-Id: I78ce660c126b53a69d5f55b16775ffcdbbe4d748
Jacob Trimble
Theodore Abshire