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).
Revert "avcodec/options_table: set err_detect to careful by default"

This reverts commit b1348eb68b432041b2557b9073590cf0fa60ff14.
Revert "avcodec/options_table: disable CRC checking by default"

This reverts commit c7027ce9eac04fb20bd85fa37dbf24856c080c45.

It appears there is no complete consensus on this currently.
avcodec/hevc: calculate checksum only if AV_EF_EXPLODE is set

This avoids a slowdown with the default of enabled CRC checks

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
lavd/fbdev_enc: remove unused variables

Signed-off-by: Lukasz Marek <lukasz.m.luki@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
lavc: add support for CODEC_CAP_DELAY in subtitles

This patch adds CODEC_CAP_DELAY support to avcodec_decode_subtitle2.

For DVB teletext decoding, a single teletext packet can contain multiple
teletext pages. In order to support that, the teletext decoder may buffer
some pages.

Signed-off-by: Marton Balint <cus@passwd.hu>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
hevc : cosmetic changes(cherry picked from commit 7308c0ccf13f18cebe4851e6dcd6b5c0b09be1dd)

Decreases the difference to Anton Khirnovs patch v5

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
hevc: more cosmetic(cherry picked from commit 9697abe41daa234602915f85bf6b1c0ca0252cff)

Decreases the difference to Anton Khirnovs patch v5

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
hevc: cosmetic change(cherry picked from commit 3b57513b3f39c04337801fb9d159c7ca8dfa9deb)

Decreases the difference to Anton Khirnovs patch v5

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
hevc: clean up mvs(cherry picked from commit 955317c09b877a513d3fcfcd1615909b2f4f651c)

Decreases the difference to Anton Khirnovs patch v5

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
hevc: better mt implementation

Signed-off-by: Mickaël Raulet <mraulet@insa-rennes.fr>
(cherry picked from commit 93afb8c519deca85b3c97804927de5b016dd32d1)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
hevc: add decode hrd
(cherry picked from commit ab4061dff796b1dd2bc884101226aab48c2c875e)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
configure: Disable -Wmaybe-uninitialized by default

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