libaacplus: set supported channel_layouts

Signed-off-by: Paul B Mahol <onemda@gmail.com>
libaacplus: set supported profiles

Signed-off-by: Paul B Mahol <onemda@gmail.com>
avutil/pixdesc: fix rgb0 descriptors

Found-by: durandal_1707
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avutil/pixdesc: support for self-checking the descriptors

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>