mxf: Add additional H264 PictureEssenceCoding

Unbreak some MXF Proxy files.
mxf: Override faulty PreviousPartition entries

Some files set the PreviousPartition field to point to its own offset.

If we are parsing forward the Previous partition is immediately known
and its value could be used, otherwise we can safely point to the
header.

Reported-By: Jean Baptiste Kempf <jb@videolan.org>
mxf: Verbose debug logging

Print the UL in code format and in the short format used by the
specification.
mxf: Lowercase UL strings

The specification uses lower case most of the time.
configure: ppc: Disable ldbrx instruction by default

Only enable it for CPUs that support it.
This restores the behavior prior to 7a650caf.
float_dsp: Use LOCAL_ALIGNED for instead of DECLARE_ALIGNED within functions

This fixes fate-float_dsp-test on RVCT 4.0.

Signed-off-by: Martin Storsjö <martin@martin.st>
Merge commit '92ebb332157195b7c1212e734c5668afbf19cf2b'

* commit '92ebb332157195b7c1212e734c5668afbf19cf2b':
  mxf: Add additional H264 PictureEssenceCoding

Conflicts:
	libavformat/mxf.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '842ea36c747eb6537c4236114346cb7a3e9a8df1'

* commit '842ea36c747eb6537c4236114346cb7a3e9a8df1':
  mxf: Override faulty PreviousPartition entries

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '6920fb2b33f84b114ea4561ae1c623f4a26562e5'

* commit '6920fb2b33f84b114ea4561ae1c623f4a26562e5':
  mxf: Verbose debug logging

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit 'af9481d7019d46c9f18c4ccac77a5d0c54cf6004'

* commit 'af9481d7019d46c9f18c4ccac77a5d0c54cf6004':
  mxf: Lowercase UL strings

Conflicts:
	libavformat/mxfdec.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '606cc8afa1cb782311f68560c8f9bad978cdcc32'

* commit '606cc8afa1cb782311f68560c8f9bad978cdcc32':
  configure: ppc: Disable ldbrx instruction by default

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  float_dsp: Use LOCAL_ALIGNED for instead of DECLARE_ALIGNED within functions

Merged-by: Michael Niedermayer <michaelni@gmx.at>
truehd: tune VLC decoding for ARM.

Profiling on a Raspberry Pi revealed the best performance to correspond
with VLC_BITS = 5. Results for overall audio decode and the get_vlc2 function
in particular are as follows:

              Before          After
              Mean   StdDev   Mean   StdDev  Confidence  Change
6:2 total     348.8  20.1     339.6  15.1    88.8%       +2.7%  (insignificant)
6:2 function  38.1   8.1      26.4   4.1     100.0%      +44.5%
8:2 total     339.1  15.4     324.5  15.5    99.4%       +4.5%
8:2 function  33.8   7.0      27.3   5.6     99.7%       +23.6%
6:6 total     604.6  20.8     572.8  20.6    100.0%      +5.6%
6:6 function  95.8   8.4      68.9   8.2     100.0%      +39.1%
8:8 total     766.4  17.6     741.5  21.2    100.0%      +3.4%
8:8 function  106.0  11.4     86.1   9.9     100.0%      +23.1%

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