4xm: check the return value of read_huffman_tables().

CC:libav-stable@libav.org
av_memcpy_backptr: avoid an infinite loop for back = 0

CC:libav-stable@libav.org
lagarith: avoid infinite loop in lag_rac_refill()

range == 0 happens with corrupted files

CC:libav-stable@libav.org
loco: check that there is data left after decoding a plane.

CC:libav-stable@libav.org
flicvideo: avoid an infinite loop in byte run compression

When byte_run is 0, pixel_countdown is not touched and the loop will run
forever.

CC:libav-stable@libav.org
mov: use the format context for logging.

CC:libav-stable@libav.org
mlpdec: do not try to allocate a zero-sized output buffer.

CC:libav-stable@libav.org
cavs: initialize various context tables to 0

Avoids crashes with corrupted files.

CC:libav-stable@libav.org
qtrle: add more checks against pixel_ptr being negative.

CC:libav-stable@libav.org
qtrle: cosmetics, reformat CHECK_PIXEL_PTR() macro
qtrle: use AV_LOG_ERROR in an error message.
libx264: change i_qfactor to use x264cli's default

This also allows libx264 to modify its i_qfactor value
when using the "-tune" setting. Previously it had a static
value of 1.25

Signed-off-by: Anton Khirnov <anton@khirnov.net>
pnm: add high-bitdepth PGMYUV support for both encoder and decoder
Remove pointless av_cold attributes in header files

The init functions marked as av_cold have to be executed in any case,
so there is no gain from trying to mark paths leading to such functions
as unlikely.
doc: developer: Allow tabs in the vim configuration for Automake files

While we do not use Automake in libav, this allows our config to be
used more globally without introducing unwanted breakage.
configure: Add print_3_columns helper function and use where appropriate
configure: Do not redundantly list enabled hwaccel libs

The enabled hwaccels are listed later anyway.

Signed-off-by: Mans Rullgard <mans@mansr.com>
configure: Simplify VDA header and extralibs check
configure: Simplify VDPAU header check
build: Add proper infrastructure for adding and checking host CPPFLAGS