Squashed commit of the following:

commit 46744c7697f29aec71aed8de3c95ce035c284d97
Author: Andreas Huber <andih@google.com>
Date:   Thu Sep 30 16:44:57 2010 -0700

    better separation of access units

    Change-Id: I5a9e2138aed341f0bcf22cfe368a15ca5ea5a73c

commit d34952ac0feb1ae722ff65824d7353335502219b
Author: Andreas Huber <andih@google.com>
Date:   Thu Sep 30 15:35:01 2010 -0700

    Support for ES packets that do not start on PES packet boundaries.

    Change-Id: I2cf012833948eddfb20b16a1901206cf22ce71e4
    related-to-bug: 2368598

Change-Id: Ib9329bd6bb7149b5a6e2483788a96b1b158952fc