h264: use avpriv_request_sample for chroma_format_idc
doxygen: Add a number of missing function parameter descriptions
doxygen: Replace @parblock syntax with manual linebreaks

@parblock is only supported in very recent Doxygen versions.
avcodec/vp8dsp: evaluate CONFIG_VP7_DECODER/CONFIG_VP8_DECODER

Reviewed-by: "Ronald S. Bultje" <rsbultje@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/ansi: fix integer overflow

Fixes out of array read
Fixes: 5f9698e86d92f19bb08d54ff0d57027f-signal_sigsegv_b30756_3795_cov_2693691257_ansi256.ans
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '614b9e4db8f3d7c23fc0410fc04745a727a82f4e'

* commit '614b9e4db8f3d7c23fc0410fc04745a727a82f4e':
  h264: use avpriv_request_sample for chroma_format_idc

Conflicts:
	libavcodec/h264_ps.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '4d7ab5cfebef91820af2933ef2f622ea598e6b53'

* commit '4d7ab5cfebef91820af2933ef2f622ea598e6b53':
  doxygen: Add a number of missing function parameter descriptions

Conflicts:
	libavformat/avformat.h

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  doxygen: Replace @parblock syntax with manual linebreaks

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