lavr: check that current_buffer is not NULL before using it

Fixes a segfault during resampling when compiled with -DDEBUG.
Fixes all fate-lavr-resample tests with -DDEBUG.

CC:libav-stable@libav.org
mmvideo: fix uninitialized variable use in mm_decode_intra

Signed-off-by: Anton Khirnov <anton@khirnov.net>
avframe: mark source frame const in _ref and _clone

Signed-off-by: Anton Khirnov <anton@khirnov.net>
avconv: drop a now useless variable
FATE: add bitexact sws flags to the fieldorder test

swscale is called for the 420 to 422 conversion

Signed-off-by: Anton Khirnov <anton@khirnov.net>
h264_ps: when parsing a VUI fails, only abort when explode is set

A VUI doesn't contain anything strictly necessary for decoding.
Apparently there are many samples with truncated VUIs in the wild, this
commit should allow decoding them.
AVOptions: do not range check flag options.

It does not make sense in the vast majority of use cases, no currently
defined AV_OPT_TYPE_FLAGS options in Libav set the range to anything
nontrivial, and many of those get it wrong (the "correct" range is
INT_MIN to INT_MAX so that the builtin constant "all" works).
configure: Disable -Wmaybe-uninitialized by default

It is by definition unreliable and causes pointless noise on valid
code.
h263: Return meaningful errors
h263: Check init_get_bits return value

And use init_get_bits8 to check for integer overflows while at it.

CC: libav-stable@libav.org
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
avio: K&R formatting cosmetics
error resilience: check error_concealment, not err_recognition.

err_recognition is supposed to trigger detecting and reporting errors,
not trying to fix them.
lavc: change all decoders to behave consistently with AV_EF_CRCCHECK.

Just crccheck prints a warning, crccheck+explode returns an error.

Also document this behavior.
lavc: disable CRC checking by default
avfilter: have avfilter_get_by_name return const for next bump

Signed-off-by: Anton Khirnov <anton@khirnov.net>
avfilter: fix const use of avfilter_next

Signed-off-by: Anton Khirnov <anton@khirnov.net>
g722dec: Change bits_per_codeword to the right option type

This isn't a set of flags but just a plain integer in the range
6-8.

Signed-off-by: Martin Storsjö <martin@martin.st>
lavf: remove unreliable timestamp guessing heuristic
lavc: don't set AVFrame.pts to random numbers in decoders.
cmdutils: fix expected signature for show_colors() function

Fix warning:
In file included from ffprobe.c:2557:0:
cmdutils_common_opts.h:17:5: warning: initialization from incompatible pointer type [enabled by default]
cmdutils_common_opts.h:17:5: warning: (near initialization for ‘real_options[16].u.func_arg’) [enabled by default]

Spotted-by: Paul B Mahol