Since this is a C11 feature, it requires -std=c11.

Not actually used for anything yet, that will be added in the following
commits.

Confirmed to work by checkasm.

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

Errors during decoding are currently considered non-fatal and do not
terminate transcoding, so even if parts of the data are corrupted, the
rest may be decodable.

However, that should apply only to the actual decoding calls, not to the
failures elsewhere (e.g. configuring filters).

The filtergraph's existence is used in several places to mean that the
filtergraph is fully configured. This causes problems if it's allocated,
but the initialization fails (e.g. if a non-existent filter is
specified).

Bug-Id: 966

The Intel binary iHD driver does not support the
VASurfaceAttribMemoryType, so surface allocation will fail when using
it.

Adds a wrapper function for downmixing which detects channel count changes
and updates the selected downmix function accordingly.

Simplification and porting to current x86inc infrastructure by Diego Biurrun.
Signed-off-by: Diego Biurrun <diego@biurrun.de>

This is about 200% faster for in-decoder downmixing of 5.0 and 5.1 content.
Signed-off-by: Diego Biurrun <diego@biurrun.de>

Also use (float **) instead of (float (*)[2]). This matches the matrix
layout in libavresample so we can reuse assembly code between the two.
Signed-off-by: Diego Biurrun <diego@biurrun.de>

Move the doxy above the definition, change the value itself to the
(1 << n) pattern, which is more readable for flags.

It is supposed to be a flag. The only currently defined value is
AVIO_SEEKABLE_NORMAL, but other ones may be added in the future.
However all the current lavf code treats this field as a bool (mainly
for historical reasons).
Change all those cases to properly check for AVIO_SEEKABLE_NORMAL.

This fixes decoding corruption on 64 bit windows.
Signed-off-by: Martin Storsjö <martin@martin.st>

This avoids SIMD-optimized functions having to sign-extend their
stride argument manually to be able to do pointer arithmetic.

ptrdiff_t is the correct type for array strides and similar.

ptrdiff_t is the correct type for array strides and similar.

ptrdiff_t is the correct type for array strides and similar.

This avoids SIMD-optimized functions having to sign-extend their
stride argument manually to be able to do pointer arithmetic.

ptrdiff_t is the correct type for array strides and similar.

ptrdiff_t is the correct type for array strides and similar.

ptrdiff_t is the correct type for array strides and similar.

Also rename all such parameters to "stride" for consistency.

While outwardly bizarre, this change makes the behaviour consistent
with other VAAPI encoders which sync to the encode /input/ picture in
order to wait for /output/ from the encoder.  It is not harmful on
i965 (because synchronisation already happens in vaRenderPicture(),
so it has no effect there), and it allows the encoder to work on
mesa/gallium which assumes this behaviour.

This improves behaviour with drivers which do not support packed
headers, such as AMD VCE on mesa/gallium.

This allows better checking of capabilities and will make it easier
to add more functionality later.

It also commonises some duplicated code around rate control setup
and adds more comments explaining the internals.