Simplifies host/target libc detection splitting.

Add preprocessor flags for API availability as necessary.
Signed-off-by: Diego Biurrun <diego@biurrun.de>

Signed-off-by: Martin Storsjö <martin@martin.st>

The a52 spec suggests that "partial compression" should scale the
drc value in this manner.
Signed-off-by: Anton Khirnov <anton@khirnov.net>

Use only proper AVFrame API (no assigning of whole frames, since that
hardcodes sizeof(AVFrame) into lavc).

Make a copy of the side data, so the caller can use av_frame_unref/free
on non-refcounted frames, eliminating the need for
avcodec_get_frame_defaults()/avcodec_free_frame().

Flags can be considered metadata (at least those that are defined now).

Not just on failure. This is the same thing that is done in the audio
path and should prevent leaks in decoders that allocate a frame, but
then end up not writing into it.

av_frame_unref() works fine on unallocated frames.

data[0] may be NULL for valid frames with hwaccel pixel formats.

All decoders should now handle it properly.

Remove the extended_data workaround, all decoders should now handle this
properly.

Directly loads AviSynth through LoadLibrary instead of relying on
Video for Windows, and supports using AvxSynth (via dlopen) to
open scripts on Linux and OS X.

Error messages from AviSynth/AvxSynth are now reported through
av_log and exit, rather than the traditional behavior of generating
an error video that the user would need to watch to diagnose.

The main rewrite was authored by d s <avxsynth.testing@gmail.com>
from the AvxSynth team, with additional contributions by

Oka Motofumi <chikuzen.mo@gmail.com>
Stephen Hutchinson <qyot27@gmail.com>
Diego Biurrun <diego@biurrun.de>
Anton Khirnov <anton@khirnov.net>
Signed-off-by: Anton Khirnov <anton@khirnov.net>

The (optimized) functions are used nowhere else.

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

Signed-off-by: Tim Walker <tdskywalker@gmail.com>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

The vlc reader cannot handle 0-bit huffman codes. For most
situations WebP uses the "simple" huffman coding for this case,
but that will only handle symbols up to 255. For the LZ77 distance
codes, larger symbol values are needed, so it can happen in rare
cases that a normal huffman table is used that only has a single
symbol.

Fixes double-free on error.

The alpha plane is not encoded.

The new name is more consistent with the rest of Libav.

The encoder uses almost none of the mpegvideo infrastructure, only some
fields from MpegEncContext.

The FATE results change because now an all-zero quant matrix is written
into the file. Since it is not used for anything for ljpeg, this should
not be a problem.

This will allow deMpegEncContextizing the LJPEG encoder.

This will allow deMpegEncContextizing the LJPEG encoder.

This will allow deMpegEncContextizing the LJPEG encoder.

Pass the three needed fields from it directly.
This will allow to deMpegEncContextize the LJPEG encoder.

It only needs PutBitContext from it, so pass that directly.

MpegEncContext.aspect_ratio_info is never set for mjpeg, so this was
never written before.