1.3x and 3% on G4.
Though I think only part of this speedup is due to my optimizations per se;
some of it is that I got a better roll on the GCC random code generator.
Trivial reorderings of this function have a disproportionate effect on speed.

Originally committed as revision 19726 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 19725 to svn://svn.ffmpeg.org/ffmpeg/trunk

The first member of struct ScanTable is a simple pointer, extra alignment
of which serves no purpose.  The alignment specifier was added along with
some Altivec optimisations also adding a 16-byte-aligned array at the end
of struct ScanTable.  Presumably the redundant, outer alignment was added
by mistake.  The inner one is clearly sufficient.

Originally committed as revision 19724 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 19723 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Christian Schmidt, schmidt digadd de

Originally committed as revision 19722 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Lars Täuber, lars D taeuber A gmx D net

Originally committed as revision 19720 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 19719 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 19718 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 19717 to svn://svn.ffmpeg.org/ffmpeg/trunk

These arrays are passed to functions for which we promise 16-byte
alignment, so make sure we fulfil that promise.

Originally committed as revision 19716 to svn://svn.ffmpeg.org/ffmpeg/trunk

None of these arrays are used in ways requiring extra alignment.

Originally committed as revision 19715 to svn://svn.ffmpeg.org/ffmpeg/trunk

Bluray subtitle decoder instead of as small as possible.
This avoids completely unnecessary issues with e.g. libswscale.
(See r19673)

Patch by Stephen Backway, stev391 A exemail D com D au

Originally committed as revision 19714 to svn://svn.ffmpeg.org/ffmpeg/trunk

Fixes "dvd_subtitle too big" errors when encoding HD video subtitles
to DVD format.

Originally committed as revision 19713 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 19712 to svn://svn.ffmpeg.org/ffmpeg/trunk

(which uses movdqa to xmm1 on inv_zigzag_direct16).

Originally committed as revision 19711 to svn://svn.ffmpeg.org/ffmpeg/trunk

If it was not 0, subtitle encoding would fail.

Originally committed as revision 19710 to svn://svn.ffmpeg.org/ffmpeg/trunk

is invalid (e.g. truncated file) we might end up reading the whole file
since trying to seek beyond the end of file does not set EOF.

Originally committed as revision 19709 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 19708 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 19707 to svn://svn.ffmpeg.org/ffmpeg/trunk

Make sure AVSubtitle is initialized, memset it to 0.

Originally committed as revision 19706 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 19705 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 19704 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 19703 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 19702 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 19701 to svn://svn.ffmpeg.org/ffmpeg/trunk

patch by Maksym Veremeyenko, verem m1stereo tv

Originally committed as revision 19700 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Stephen Backway, stev391 A exemail D com D au

Originally committed as revision 19699 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 19698 to svn://svn.ffmpeg.org/ffmpeg/trunk

The difference between 188 and 204 is not worth worrying about.

Originally committed as revision 19697 to svn://svn.ffmpeg.org/ffmpeg/trunk

Storing a single element from a vector where all elements have the same
value does not require an aligned destination.  Which element is stored
depends on the alignment of the destination address, but since they all
have the same value, the result is the same regardless of the alignment.

Originally committed as revision 19696 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 19695 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 19694 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 19693 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 19692 to svn://svn.ffmpeg.org/ffmpeg/trunk

Instead of filling a local array with the desired value and loading it,
load a single element and vec_splat() it to fill the vector.

Originally committed as revision 19691 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 19690 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 29548 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale

Originally committed as revision 29547 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale

Originally committed as revision 19689 to svn://svn.ffmpeg.org/ffmpeg/trunk

This makes comma-separated patters to --disable-decoder and friends
work correctly with POSIX-compliant shells.

Originally committed as revision 19688 to svn://svn.ffmpeg.org/ffmpeg/trunk