https://en.wikibooks.org/wiki/Regular_Expressions/POSIX_Basic_Regular_Expressions

Fixes NDKr10e on Cygwin,
CC_IDENT for it is defined as
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Fixes Ticket2513
Fixes Ticket4432
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

This allows configuring the io buffer in such way that few seeks are needed for playback
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

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

There was some reorganisation in the HEVC headers so the sps and pps
now live in a different place.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

internal.h is difficult to use due to circular dependancies
mem.h is a public header ff_* is not public
Alternative solutions probably are possible too
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Feel free to use either, they both work but the old one provides
more information but needs the hevc decoder
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

* commit '650060df':
  hevc_parser: parse and export some stream parameters

Conflicts:
	configure
	libavcodec/hevc_parser.c
Merged-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

* commit '7f78155d':
  hevc: improve a comment
Merged-by: Michael Niedermayer <michael@niedermayer.cc>

* commit 'd82e1adc':
  hevc: move splitting the packet into NALUs into a separate function

Conflicts:
	libavcodec/hevc.c
	libavcodec/hevc.h
	libavcodec/hevc_parse.c
Merged-by: Michael Niedermayer <michael@niedermayer.cc>

* commit 'ae05b486':
  hevc: eliminate the second call to hls_nal_unit()

Conflicts:
	libavcodec/hevc.c
Merged-by: Michael Niedermayer <michael@niedermayer.cc>

* commit 'd7bebe48':
  hevc: skip invalid/ignored NALUs when splitting the packet
Merged-by: Michael Niedermayer <michael@niedermayer.cc>

* commit 'b11acd57':
  hevc: remove HEVCContext usage from hevc_ps

Conflicts:
	libavcodec/hevc.c
	libavcodec/hevc_cabac.c
	libavcodec/hevc_filter.c
	libavcodec/hevc_mvs.c
	libavcodec/hevc_ps.c
	libavcodec/hevc_refs.c
	libavcodec/hevcpred_template.c
Merged-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

* commit 'ab05ed4c':
  mpegvideo_parser: export pixel format and dimensions

Conflicts:
	libavcodec/mpegvideo_parser.c
Merged-by: Michael Niedermayer <michael@niedermayer.cc>

* commit '9f4c7397':
  hevc: check slice address length

See: 05cc8c8eMerged-by: Michael Niedermayer <michael@niedermayer.cc>

* commit 'a9a2f361':
  doc: add a section about building with libmfx

Conflicts:
	doc/general.texi
Merged-by: Michael Niedermayer <michael@niedermayer.cc>

* commit '86eee85d':
  bytestream2: set the reader to the end when reading more than available
Merged-by: Michael Niedermayer <michael@niedermayer.cc>

* commit '8bc67ec2':
  Checkasm: assembly testing and benchmarking tool
Merged-by: Michael Niedermayer <michael@niedermayer.cc>

Fixes Ticket4546
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

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

This also prevents an eventual compilation failure once request_channels
is removed.
Reviewed-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: James Almer <jamrial@gmail.com>

Particularly those that will be needed by the QSV decoder.
More can be added later as necessary.

That loop does the actual full decoding, so 'parse' can be misleading.

This function is independent of the decoding context, so we'll be able
to use it in the parser.

Also, make hls_nal_unit() work only on the provided NAL unit, without
requiring a whole decoding context.

This will allow splitting this code for reuse by the parser.

There is no need to wait until actually decoding the NALU. This will
allow to get rid of the second hls_nal_unit() call later.

Factor out the parameter sets into a separate struct and use it instead.

This will allow us to reuse this code in the parser.

It is used as get_bits argument and reading 0 bits doesn't make sense.
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>