WebPAnimEncoder API is a combination of encoder (WebPEncoder) and muxer
(WebPMux). It performs several optimizations to make it more efficient
than the combination of WebPEncode() and native ffmpeg muxer.

When WebPAnimEncoder API is used:
- In the encoder layer: we use WebPAnimEncoderAdd() instead of
  WebPEncode().
- The muxer layer: works like a raw muxer.

On the other hand, when WebPAnimEncoder API isn't available, the old code is
used as it is:
- In the codec layer: WebPEncode is used to encode each frame
- In the muxer layer:  ffmpeg muxer is used
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Prevents read of uninitialized variable

Based on patch by: Andreas Cadhalpun <andreas.cadhalpun@googlemail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

* commit '4e17946f':
  mpegvideo: Rework various functions not to use MpegEncContext directly

Conflicts:
	libavcodec/mpegvideo.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'a3f4c930':
  mpegvideo: Have ff_mpeg_ref_picture use AVCodecContext directly

Conflicts:
	libavcodec/mpegvideo.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'd5280455':
  mpegvideo: Have ff_mpeg_unref_picture use AVCodecContext directly

Conflicts:
	libavcodec/mpegvideo.c
	libavcodec/mpegvideo_enc.c

The memset is left in place
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '6f54dc43':
  mpegvideo: Drop stream_codec_tag
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '9c1db92a':
  mpegvideo: Drop err_recognition

Conflicts:
	libavcodec/h263dec.c
	libavcodec/ituh263dec.c
	libavcodec/mpeg4video.h
	libavcodec/mpeg4videodec.c
	libavcodec/msmpeg4dec.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '848e86f7':
  mpegvideo: Drop flags and flags2

Conflicts:
	libavcodec/mpeg12dec.c
	libavcodec/mpeg12enc.c
	libavcodec/mpegvideo.c
	libavcodec/mpegvideo_enc.c
	libavcodec/mpegvideo_motion.c
	libavcodec/ratecontrol.c
	libavcodec/vc1_block.c
	libavcodec/vc1_loopfilter.c
	libavcodec/vc1_mc.c
	libavcodec/vc1dec.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Niklesh <niklesh.lalwani@iitb.ac.in>

This skips setting the memory to 0 but allows for reuse on different
contextes. Oracle did not report any unsual activity because of it.

The field is unused.

It is just a duplicate of an AVCodecContext member so use it instead.

They are just duplicates of AVCodecContext members so use those instead.

Previous version Reviewed-by: tim nicholson <nichot20@yahoo.com>
Previous version Reviewed-by: Tomas Härdin <tomas.hardin@codemill.se>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Tim Nicholson <tim.nicholson@bbc.co.uk>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

* commit '29216d7f':
  tls: fix compilation when both gnutls and openssl are enabled

See: e91fbfd9Merged-by: Michael Niedermayer <michaelni@gmx.at>

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

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

This is the 2nd patch in preparation for using WebPAnimEncoder API for encoding
and muxing WebP images.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

* commit '94599a6d':
  tls: Remove all the local polling loops
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'd13b124e':
  tls: Remove the nonblocking code
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'd15eec4d':
  tls: Use custom IO to read from the URLContext
Merged-by: Michael Niedermayer <michaelni@gmx.at>

This is the 1st patch in preparation for using WebPAnimEncoder API for encoding
and muxing WebP images.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

These aren't necessary any longer.
Signed-off-by: Martin Storsjö <martin@martin.st>

Since the underlying URLContext read functions are used,
they handle interruption, without having to handle it at
this level.
Signed-off-by: Martin Storsjö <martin@martin.st>

This avoids hijacking the fd, by reading using the normal
URLContext functions instead. This allowing reading data that has
been buffered in the underlying URLContext.

This avoids using the libraries own send functions that can
cause SIGPIPE.

The fd is still used for polling the lowlevel socket, for
waiting for retries.
Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

the incorrect UMULH, ff_sqrt, MAC64 and MLS64 to be optimized later, delete them just for now.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Better to be explicit before someone thinks this could be the time axis ...
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

avutil/pixfmt: Clarify that the ASCII art describes the location of the first chroma sample of AVChromaLocation
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Found-by: rcombs
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>