Merge commit 'ef1b23ad'

* commit 'ef1b23ad': (21 commits)
  jvdec: set channel layout
  iss: set channel layout
  ipmovie: set channel layout
  iff: set channel layout
  idroqdec: set channel layout
  gxfdec: set channel layout when applicable
  gsmdec: set channel layout
  flvdec: set channel layout
  dv: set channel layout
  dsicin: set channel layout
  daud: set channel layout
  cdxl: set channel layout
  bmv: set channel layout
  bink: set channel layout
  bfi: set channel layout
  bethsoftvid: set channel layout
  apc: set channel layout
  amr: set channel_layout
  ppc: replace pointer casting with AV_COPY32
  ppc: fix some unused variable warnings
  ...

Conflicts:
	libavformat/amr.c
	libavformat/iff.c

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