This allows compiling optimised functions for features not enabled
in the core build and selecting these at runtime if the system has
the necessary support.
Signed-off-by: Mans Rullgard <mans@mansr.com>

This is consistent with usual ARM nomenclature as well as with the
VFPV3 and NEON symbols which both lack the ARM prefix.
Signed-off-by: Mans Rullgard <mans@mansr.com>

These macros reflect the actual capabilities required here.
Signed-off-by: Mans Rullgard <mans@mansr.com>

Signed-off-by: Janne Grunau <janne-libav@jannau.net>

It was wrongly set as the yuva 16bit one.
Signed-off-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

This allows parsing of special-case negative numbers like decibels.

Include x86-optimized versions for SSE2 and AVX.

Not all versions or API subsets of windows have these functions.
Signed-off-by: Martin Storsjö <martin@martin.st>

Not all versions of windows have the console color functions,
while io.h might be needed for isatty (which can be found in
unistd.h or io.h).
Signed-off-by: Martin Storsjö <martin@martin.st>

The existence of MapViewOfFile isn't linked to the existence of
io.h.

Not all versions of windows have MapViewOfFile (in particular,
Windows Phone 8 and the "metro" windows 8 API subset don't),
while they still have io.h (and need it for open/read/close).
Signed-off-by: Martin Storsjö <martin@martin.st>

The test for rweflags was dropped in a previous commit.

Signed-off-by: Mans Rullgard <mans@mansr.com>

Preventing the use of discouraged or 'insecure' external functions
through defines in an internal header is not a good solution. The
header is not guaranteed to be included universally which makes
overlooking bad use of said functions during review more likely.

There are cases were those functions either are the most straight
forward solution or even have to be used. Using malloc or free is
required if the allocation or release is done by other libraries.

- Add special cases for offsets of 2, 3, or 4 bytes.  This means the
  offset is always >4 in the generic case, allowing 32-bit copies to
  be used there.
- Don't use memcpy() for sizes less than 16 bytes.
Signed-off-by: Mans Rullgard <mans@mansr.com>

This removes an inter-library dependency on ff_log2_tab causing
linking errors in some configurations.
Signed-off-by: Mans Rullgard <mans@mansr.com>

Deprecate avcodec_get_chroma_sub_sample.

An assembler able to cope with AVX instructions is now required.

This reduces the local difference to the x264 upstream version.

"mmxext" is a more sensible name and more common in outside projects.

This allows overriding the value from outside of the file.

Unlike YASM, NASM only looks for include files in the current
directory, not in the directory that included files reside in.
Signed-off-by: Diego Biurrun <diego@biurrun.de>