Visual Studio 2015 Update 3 introduced a new SSA optimizer, however
it unfortunately causes miscompilations. Until it is fixed, the new
optimizations are disabled and should be re-checked on subsequent
compiler releases.

Fixes recent FATE failure of fate-lavf-pam on VS2015.

Reviewed-by: Ronald S. Bultje <rsbultje@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>

The default value of -1 indicates that ffmpeg should determine the channel
mapping automatically, which was the behavior before this commit.

Unless the -mapping_family argument is provided, behavior is unchanged.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

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

The code is documented as to require 8byte alignment
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

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

Fixes use of freed memory
Should fix valgrind failures of fate-h264-skip-nointra

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

Changed by committer to ensure context_initialized is reset
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

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

* commit '6e92181b':
  h264: pass just the PPS to get_chroma_qp()
Merged-by: Clément Bœsch <clement@stupeflix.com>

* commit 'd1f539c9':
  h264: merge the two reinit blocks in slice_header_parse()
Merged-by: Clément Bœsch <clement@stupeflix.com>

* commit '3fba16ec':
  h264: factor starting a new field out of parsing the slice header
Merged-by: Clément Bœsch <clement@stupeflix.com>

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

Based-on: patch by James Almer
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

This fixes part of Ticket5676
This fixes kodi, mpv, chromium and ffplay build against 3.0 and linked to 3.1

This is a similar ABI fix to 1eb43af1

Approved-by: BBB
Approved-by: jamrial
Approved-by: BtbN
Approved-by: nevcairiel
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

This ensures the AVStream->codec entry is kept in sync when new streams are
discovered mid-playback or changes to the context occur from other sources.

Fixes trac 5678.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

This fixes part of Ticket5676
This fixes kodi, mpv, chromium and ffplay build against 3.0 and linked to 3.1

This is a similar ABI fix to 1eb43af1

Approved-by: BBB
Approved-by: jamrial
Approved-by: BtbN
Approved-by: nevcairiel
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

fix ticket #5674

the size of data to process in piz_uncompress, is now calc
using the pixel type of each channel.

the data reorganization, alos take care about the size of
each channel
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

This patch addresses Trac ticket #5570. The optimized functions are in file
libswscale/ppc/input_vsx.c. Each optimized function name is a concatenation of the
corresponding name in libswscale/input.c with suffix _vsx.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Github: Closes #222

* commit 'bec99338':
  h264: postpone generating the implicit MMCOs
Merged-by: Clément Bœsch <clement@stupeflix.com>

* commit '2d410ebb':
  h264: decode the MMCOs into per-slice contexts
Merged-by: Clément Bœsch <clement@stupeflix.com>

The MBS only flag was not taken into account when checking macroblock dimensions.
Also removes the unneeded check in init_dimensions for slices.

In order to be able to make SPS const in H264ParamSets,
modify decode_scaling_matrices so that it returns if the scaling
matrix are present in the SPS, instead of altering the input SPS
structure.

* commit '39ab2ea5':
  h264: rename mmco_index to nb_mmco
Merged-by: Clément Bœsch <u@pkh.me>

* commit '7ab5d577':
  h264: move initializing the slice start out of h264_slice_header_parse()
Merged-by: Clément Bœsch <u@pkh.me>

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

This fixes an accidental ABI break introduced at 8688d3af.

* commit '4cec43a9':
  h264: move calculating the POC out of h264_slice_header_parse()
Merged-by: Clément Bœsch <clement@stupeflix.com>

* commit '6dd996c7':
  h264: move building the reference list out of h264_slice_header_parse()
Merged-by: Clément Bœsch <clement@stupeflix.com>

* commit '0bad2543':
  h264: move initing the implicit pred weight table out of h264_slice_header_parse()
Merged-by: Clément Bœsch <clement@stupeflix.com>

* commit 'ed9a20eb':
  h264: split reading the ref list modifications and actually building the ref list

ref_modifications.val are read as u32 instead of u8 in FFmpeg.
Merged-by: Clément Bœsch <clement@stupeflix.com>

Fixes ./ffmpeg -skip_frame nokey -i h264/h264_intra_first-small.ts

Regression since c54e2740

* commit 'fa570590':
  h264: move initialising the implicit pred weight table for MBAFF
Merged-by: Clément Bœsch <clement@stupeflix.com>

* commit '7b50d604':
  h264: call ff_h264_fill_mbaff_ref_list() when constructing the normal ref list
Merged-by: Clément Bœsch <clement@stupeflix.com>

* commit 'b16e9b9a':
  h264: move initialising the explicit pred weight table for MBAFF
Merged-by: Clément Bœsch <clement@stupeflix.com>