Recent versions of macOS provide more POSIX API (in particular,
clock_gettime) than previous versions and recent Apple toolchains
provide all that API, even when targeting older releases without
said API. Disallow linking to functions which might not be available
at runtime.

To actually have an effect, either add
--extra-cflags="-mmacosx-version-min=10.11" (or any other version
prior to 10.12) or set MACOSX_DEPLOYMENT_TARGET=10.11 when running
configure.

As a workaround for libav versions without this fix, one can
also add --extra-cflags="-mmacosx-version-min=10.11
-Werror=partial-availability" while running configure.

The -no_weak_imports flag is new in Xcode 8; in Xcode 7 it is not
supported. This is not an issue since Xcode 7 only ships with the
10.11 macOS SDK, which lacks clock_gettime.

Bug-Id: 1033

CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>

NASM is more actively maintained and permits generating dependency information
as a sideeffect of assembling, thus cutting build times in half.

SDL adds some "special" CFLAGS that interfere with building normal
binaries. Capture those CFLAGS separately and avoid adding them to
the general CFLAGS.

We should only check for clock_gettime() if _POSIX_MONOTONIC_CLOCK is
available and do a full link check for clock_gettime() in all cases.

The constants used in the decoder used floating point precision,
and this caused different values to be generated on different
architectures. Additionally on big endian machines, the fate test
would output bytes in native order, which is different from the one
hardcoded in the test.

So, eradicate floating point numbers and use fixed point (32.32)
arithmetics everywhere, replacing constants with precomputed integer
values, and force the pixel format output to be the same in the fate
test.
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

Consistently use object format names with "32" suffix and set object format
to "win64" on Windows x86_64, which fixes assembling with nasm.

qmin and qmax are not necessary for nvenc vbr.

Also fix for using 2 pass vbr mode for slow preset through ctx->flag NVENC_TWO_PASSES.
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

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

libavutil uses pthreads in the buffer code (abstracted through a header).

None of them are specific to the YASM assembler.

Also drop stray duplicate OBJCC config.mak entry.

This fixes several warnings of the sort
warning: label alone on a line without a colon might be in error

Previously, all link-time dependencies were added for all libraries,
resulting in bogus link-time dependencies since not all dependencies
are shared across libraries. Also, in some cases like libavutil, not
all dependencies were taken into account, resulting in some cases of
underlinking.

To address all this mess a machinery is added for tracking which
dependency belongs to which library component and then leveraged
to determine correct dependencies for all individual libraries.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

Leaving those variables in an undefined state allows them getting implicitly
enabled when they are declared as weak dependencies of other components.
In that case, the library check is not run and required linker flags are not
added, resulting in a failing build.

Fixes linking when enabling libfreetype without libfontconfig.

The codec used in those files is WMV3/WMV9, not WMV2/WMV8.

The map is a sparse array and does not need a empty element to terminate
it.

The empty element is stored after the last one inserted in the list,
overwriting whichever element was next with zeros.

Bug-Id: 1029
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

This allows dropping /dev/null as reference value when no output is generated.

And use av_malloc_array.

This fixes the test with mmxext disabled because the current reference
frame hashes correspond to the non-bitexact mmxext optimizations.

This error is treated specially by the API.

CC: libav-stable@libav.org

The size field in the header/footer accounts for the entire APE tag
structure except the 32 bytes from header, for compatibility with
APEv1.
Signed-off-by: James Almer <jamrial@gmail.com>

CC: libav-stable@libav.org
Signed-off-by: Anton Khirnov <anton@khirnov.net>

According to the spec[1], a value of 0 means the footer is present and a value
of 1 means it's absent, the exact opposite of header presence flag where 1
means present and 0 absent.
The reason for this is compatibility with APEv1 tags, where there's no header,
footer presence was mandatory for all files, and the flags field was a zeroed
reserved field.

[1] http://wiki.hydrogenaud.io/index.php?title=Ape_Tags_FlagsSigned-off-by: James Almer <jamrial@gmail.com>

CC: libav-stable@libav.org
Signed-off-by: Anton Khirnov <anton@khirnov.net>

Currently it incorrectly compares bits with bytes.

Also, move the check right before where it's relevant, so that the
correct number of remaining bits is used.

CC: libav-stable@libav.org

avio_skip returns file position and overflows int