Trying to be clever about determining between interface version 8
and 8.1 ended up with pre-8.1 versions of AviSynth+ segfaulting.

The amount of time between interface version 8.1 and 9 is small,
so just restrict the frameprop awareness to version 9 and call it
a day.
Signed-off-by: Stephen Hutchinson <qyot27@gmail.com>

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

This automatically makes the remaining mpegvideo-decoders
(namely msmpeg4v[1-3], mss2, VC-1, VC-1 Image, WMV-[1-3]
and WMV-3 Image) init-threadsafe.
These were the last native codecs that were not init-threadsafe;
only wrappers for external libraries and for hardware accelerations
are now not init-threadsafe.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

It does not modify any static data in its init function.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

This automatically makes the FLV, H.263, H.263+, Intel H.263,
MPEG-4, RealVideo 1.0 and RealVideo 2.0 decoders init-threadsafe.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

It does not initialize any static data in its init function.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

Init-threadsafe since f697622f.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

The only interesting thing done in SVQ3's init function
is using zlib, but this is fine: https://zlib.net/zlib_faq.html#faq21Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

Since the av_malloc() may fail and return NULL pointer,
it is needed that the 's->edge_emu_buffer' should be checked
whether the new allocation is success.

Fixes: d1472386 ("VP3: fix decoding of videos with stride > 2048")
Reviewed-by: Peter Ross <pross@xvid.org>
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>

Make the code more readable and follow the style guide.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Clear anything that av_hwframe_map() might have done to the destination
frame, but leave caller-provided fields unchanged.

Reduce some asserts by default.