lavc/elbg: rename ff_ symbols to avpriv_, so they can be used in shared libs

In particular, allows the use of elbg in other FFmpeg libraries, required
by the pending elbg filter.
lavfi: add elbg filter
lavd/xv: fix memory leak

Results of XvQueryAdaptors have to be freed with XvFreeAdaptorInfo.

Signed-off-by: Lukasz Marek <lukasz.m.luki@gmail.com>
doc: remove soc.txt

The file was written in 2006, it was never updated nor really used as
reference for SOC-like programs.

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Signed-off-by: Stefano Sabatini <stefasab@gmail.com>
avformat/mmst: propagate error code from avio_put_str16le()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avio_put_str16le: Print error message in case of invalid UTF8 input

Found-by: Stefano Sabatini
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avformat/aviobuf: return error from avio_put_str16le() for invalid input

Found-by: Stefano Sabatini
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
configure: Check whether MSVC requires using the C89-to-C99 converter

MSVC does support enough of C99 to work without the converter since
the 2013 version. Try to detect which version of the compiler in
the path needs to run the C99 converter or not. When the converter
is omitted, compilation time is reduced quite drastically.

Prior to this, users could still use --cc="c99conv -noconv cl"
when running MSVC 2013 to achieve the same.

This checks the version number instead of doing a normal compile
test, since this check needs to be done earlier in configure, before
the normal compile test helpers are usable.

Signed-off-by: Martin Storsjö <martin@martin.st>
Remove all Alpha architecture optimizations

Alpha has been end-of-lifed and no more test machines are available.
Deprecate obsolete XvMC hardware decoding support

XvMC has long ago been superseded by newer acceleration APIs, such as
VDPAU, and few downstreams still support it. Furthermore XvMC is not
implemented within the hwaccel framework, but requires its own specific
code in the MPEG-1/2 decoder, which is a maintenance burden.
ffmpeg_opt: fix overriding values set by -target

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avformat/nullenc: mark null as VFPS

This avoids frame duplication for null output
avoiding unneeded computations.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '16381923fb7b9087ce559fb1cd3594469ac6788b'

* commit '16381923fb7b9087ce559fb1cd3594469ac6788b':
  configure: Check whether MSVC requires using the C89-to-C99 converter

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit 'c7f7bfc9e3a3150ba72bc34366c13fb2210c66ac'

* commit 'c7f7bfc9e3a3150ba72bc34366c13fb2210c66ac':
  Remove all Alpha architecture optimizations

Conflicts:
	libavcodec/alpha/asm.h
	libavcodec/alpha/dsputil_alpha.c
	libavcodec/alpha/dsputil_alpha.h
	libavcodec/alpha/dsputil_alpha_asm.S
	libavcodec/alpha/hpeldsp_alpha.c
	libavcodec/alpha/hpeldsp_alpha.h
	libavcodec/alpha/hpeldsp_alpha_asm.S
	libavcodec/alpha/motion_est_alpha.c
	libavcodec/alpha/motion_est_mvi_asm.S
	libavcodec/alpha/mpegvideo_alpha.c
	libavcodec/alpha/regdef.h
	libavcodec/alpha/simple_idct_alpha.c

We have a qemu based fate alpha client. And various failures
on alpha have previously pointed to issues in generic C code.
Thus IMHO it makes sense to keep alpha code as long as someone
is willing to do the little bit of maintaince it needs

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

* qatar/master:
  Deprecate obsolete XvMC hardware decoding support

Conflicts:
	libavcodec/mpeg12.c
	libavcodec/mpeg12dec.c
	libavcodec/mpegvideo.c
	libavcodec/options_table.h
	libavutil/pixdesc.c
	libavutil/version.h

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