This is part of the Great Evil Plan to simplify swscale.

This generates better code on some non-x86 architectures.

This reduces source code size without affecting the binary.

Remove inline keyword from functions that are never inlined.
Use av_always_inline for functions that should be force-inlined
for performance reasons. Use av_cold for init functions.

Remove inline keyword for functions that are only called through
their function pointers (and thus cannot be inlined); add av_cold
keyword to init function, and use av_always_inline instead of
inline for functions that must be inlined for performance reasons.

This fixes a potential double free.
Signed-off-by: Martin Storsjö <martin@martin.st>

This might happen if there was an error before priv_data was allocated
and result in segfault.

This prevents the following compiler warnings: "warning:
initialization from incompatible pointer type". Since the
variables are only ever used in inline assembly, their type
is actually irrelevant (so the part where it was wrong did
not invoke any buggy behaviour).

This way, they look like regular code, which is easier to
understand.

Use of this wrapper was removed in a previous patch, but I
forgot to actually remove the function itself.

This fixes the warning:
libavformat/options.c:62:1: warning: missing braces around initializer [-Wmissing-braces]

Rename it to AVDictionary, since it will be used as such.  Tags
documentation and metadata conversion API is lavf-specific, so remains
there.

Change indentation and whitespace; also move HAVE_YASM blocks.
Signed-off-by: Diego Biurrun <diego@biurrun.de>

The AC-3 encoder unconditionally references some symbols from the E-AC-3
encoder; make those references conditional to fix linking.

read_sequence_header can change width/height; therefore, re-initialize
all tables if width/height changed
Signed-off-by: Anton Khirnov <anton@khirnov.net>

Deprecate av_get_bits_per_sample_fmt(), which was a misnamed function.

For the moment we don't have sample formats with a non-integer number
of bytes, in that case we may need to create a new
av_get_bits_per_sample() function. In the meanwhile we prefer to adopt
this variant, since avoids divisions by 8 all over the place.

The current filter implementation should only have the cx coefficients
divided by gain in order to give the correct output scale.

They are hacks added to reuse the same scaling function for
different formats and they may cause problems when SIMD
implementation of the same functions are used along with pure
C functions.

Make yuv2yuvX16_c a function pointer for yuv2yuvX(), so that the
function pointer becomes bitdepth-independent.

The option is disabled by default, so enabling it should be documented.