output example: convert audio to the format supported by the encoder
hevcdsp: remove an unneeded variable in the loop filter

beta0 and beta1 will always be the same
hevc: SSE2 and SSSE3 loop filters

Additional contributions by James Almer <jamrial@gmail.com>,
Carl Eugen Hoyos <cehoyos@ag.or.at>, Fiona Glaser <fiona@x264.com> and
Anton Khirnov <anton@khirnov.net>

Signed-off-by: Anton Khirnov <anton@khirnov.net>
Merge commit '56f98e340fca894a76d1ddbe33118b8d8c4db34a'

* commit '56f98e340fca894a76d1ddbe33118b8d8c4db34a':
  output example: convert audio to the format supported by the encoder

Conflicts:
	doc/examples/muxing.c

Not merged as our example code already does that for what is needed
and we generate matching data for the rest. generating fixed data
and converting all parameters could be done of course.

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '73bb8f61d48dbf7237df2e9cacd037f12b84b00a'

* commit '73bb8f61d48dbf7237df2e9cacd037f12b84b00a':
  hevcdsp: remove an unneeded variable in the loop filter

Conflicts:
	libavcodec/hevc_filter.c

See: d7e162d46b4a0fc03ca5161cdcac840152f048cb
Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '1a880b2fb8456ce68eefe5902bac95fea1e6a72d'

* commit '1a880b2fb8456ce68eefe5902bac95fea1e6a72d':
  hevc: SSE2 and SSSE3 loop filters

Conflicts:
	libavcodec/hevcdsp.c
	libavcodec/hevcdsp.h
	libavcodec/x86/Makefile
	libavcodec/x86/hevc_deblock.asm
	libavcodec/x86/hevcdsp_init.c

See: de7b89fd43f850d77cf24ad6ae50185dfe391e91 and several others
Merged-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/x86/hevcdsp_init: make license header consistent

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
x86/hevc_idct: add 12bit idct_dc

Signed-off-by: James Almer <jamrial@gmail.com>
Reviewed-by: Mickaël Raulet <mraulet@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>