Refactor MPEG4Writer::writeTrackHeader() method

o most of the mp4 file boxes has its own method now
TODO: remove some of the duplicated code for esds box, for instance.

Change-Id: Iae3dbb2410b79bc79aaee081b80569d339993c47
2 files changed
tree: 6bad8d66e2200f9dcc23e5be8b00734aec7cf66a
  1. camera/
  2. cmds/
  3. drm/
  4. include/
  5. media/
  6. services/