commit d99d354df109fa70d2cc15d2586d852d278320b2
author dougsteed <dougsteed@chromium.org> Fri Sep 29 17:48:38 2017
committer Commit Bot <commit-bot@chromium.org> Fri Sep 29 17:48:38 2017
tree 62a34074c9c4a0c1ddc71bc72986d18c2e43af1c
parent bac09f352af1282d5cd4efc26d0b26a88f75442d

Declare intent to use sample-aes later in the stream.

Allows the declaration in an unencrypted part of a stream of an intent
to use sample-aes encryption later. This allows the decoding backend to
be properly initialized with the appropriate encryption scheme.
This involves prefixing a subset of the encryption metadata that is used
to indicate encryption, but omits the key id and IV.

This will typically be used in a live stream, when tuning in during
an unencrypted part, e.g. a commercial.

BUG=568326

Review-Url: https://chromiumcodereview.appspot.com/2783703002
Cr-Commit-Position: refs/heads/master@{#505415}