This also adds support to avconv (which is trivial due to the new
hwaccel API being generic enough).

The new decoder setup code in dxva2.c is significantly based on work by
Steve Lhomme <robux4@gmail.com>, but with heavy changes/rewrites.

Merges Libav commit f9e7a2f9.
Also adds untested VP9 support.
The check for DXVA2 COBJs is removed. Just update your MinGW to
something newer than a 5 year old release.

Signed-off-by: Diego Biurrun <diego@biurrun.de>

None of them are specific to the YASM assembler.

(Cherry-picked from libav commit 39e208f4)

Signed-off-by: James Almer <jamrial@gmail.com>

(cherry picked from commit aa6b2e08)

(cherry picked from commit 62a1ef9f)

Not yet enabled for any hwaccels.

(cherry picked from commit d2e6dd32)
(cherry picked from commit 9203aac2)

Signed-off-by: Paul B Mahol <onemda@gmail.com>

It's not used by anything, has dubious usefulness, the reasons for which
it was introduced are no longer valid, and only serves to add complexity
to the build system.

Signed-off-by: James Almer <jamrial@gmail.com>

Original work by Yogender Gupta <ygupta@nvidia.com>

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

Found-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: James Almer <jamrial@gmail.com>

Fixes ticket #5546.

This moves work from the configure to the Make stage where it can
be parallelized and ensures that pkgconfig files are updated when
library versions change.

Bug-Id: 449

This moves work from the configure to the Make stage where it can
be parallelized and ensures that shared libraries are built with
the right version number in the filename.

This unclutters the top-level directory and groups related files together.

This makes naming more consistent and simplifies extralibs-related changes.

Otherwise builds without explicit target result in silent no-ops.

The library versions are stored in the config.mak file and are used
to derive shared library names.

EXTRALIBS contains general and platform-specific extra libraries
that should be part of all linker commands.

Supporting the system was a nice joke for the 9 release, but it has
run its course. Nowadays Plan 9 receives no testing and has no
practical usefulness.

Since avversion.h is a generated header it must be created before
dependencies can be determined as a side effect of compilation.
Otherwise Make stops and restarts the build process to generate
avversion.h and produces related error messages.

It didn't take into account the new pattern used for bitstream filters
and protocols.

The variable needs to be reset for each subdirectory.

And move the asm recipe to the top-level Makefile next to the other
local pattern rules for .o files.

Generate the files in a single postprocessing step w/o intermediate files.

Split version files into one line per symbol/directive to allow compatibility
with the Solaris linker without preprocessing and eliminate $ from version file
templates to simplify the postprocessing shell command.

Restore alphabetical order in lists, break overly long lines, do some
prettyprinting, add some explanatory section comments, group parts
together that belong together logically.

Signed-off-by: Anton Khirnov <anton@khirnov.net>

Testset provided by Justin Greer <justin@zencoder.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Otherwise the 'lcov -q --remove' run fails with the following error:
lcov: ERROR: cannot write to coverage.info!

Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>

Or when building in-tree.
Also don't try to remove src on distclean in these cases.

Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>