Strip out most x264-specific stuff (not used anywhere in ffmpeg).

Originally committed as revision 23877 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23876 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23875 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23874 to svn://svn.ffmpeg.org/ffmpeg/trunk

Also add predict_4x4_dc MMXEXT function for vp8/h264.

Originally committed as revision 23873 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23872 to svn://svn.ffmpeg.org/ffmpeg/trunk

Short windows are of length 256 and begin at sample 448.

Originally committed as revision 23871 to svn://svn.ffmpeg.org/ffmpeg/trunk

This keeps the encoder from switching away from an wight short sequence
prematurely when attacks are detected two frames in a row. It also allows for
the legal and useful LONG_STOP_SEQUENCE to LONG_START_SEQUENCE transition.

Originally committed as revision 23870 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23869 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23868 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23867 to svn://svn.ffmpeg.org/ffmpeg/trunk

This fixes a valgrind error when encoding to ADTS.

Originally committed as revision 23866 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23865 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23864 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Josh Allmann, joshua dot allmann at gmail

Originally committed as revision 23862 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Josh Allmann, joshua dot allmann at gmail

Originally committed as revision 23861 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Josh Allmann, joshua dot allmann at gmail

Originally committed as revision 23860 to svn://svn.ffmpeg.org/ffmpeg/trunk

This allows very large value strings, needed for xiph extradata.

Patch by Josh Allmann, joshua dot allmann at gmail

Originally committed as revision 23859 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23858 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23857 to svn://svn.ffmpeg.org/ffmpeg/trunk

No changes in generated code.

Originally committed as revision 23856 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23855 to svn://svn.ffmpeg.org/ffmpeg/trunk

16 subblocks (since we no longer need that), which should also lead to a
minor speedup.

Originally committed as revision 23854 to svn://svn.ffmpeg.org/ffmpeg/trunk

we apply them as 16x8/8x16/8x8 subblocks where possible. Since this allows
us to use width=8/16 instead of width=4 MC functions, we can now take more
advantage of SSE2/SSSE3 optimizations, leading to a total speedup for splitMV
filter of about 10%.

Originally committed as revision 23853 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Josh Allmann, joshua dot allmann at gmail

Originally committed as revision 23852 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Josh Allmann, joshua dot allmann at gmail

Originally committed as revision 23851 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Josh Allmann, joshua dot allmann at gmail

Originally committed as revision 23850 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Josh Allmann, joshua dot allmann at gmail

Originally committed as revision 23849 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Josh Allmann, joshua dot allmann at gmail

Originally committed as revision 23848 to svn://svn.ffmpeg.org/ffmpeg/trunk

This will be used for cleaning up code that is common among RTP depacketizers.

Patch by Josh Allmann, joshua dot allmann at gmail

Originally committed as revision 23847 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Josh Allmann, joshua dot allmann at gmail

Originally committed as revision 23846 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23845 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23844 to svn://svn.ffmpeg.org/ffmpeg/trunk

This allows explicitly enabled things to _select others with the
intended result.

Originally committed as revision 23843 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Eli Friedman, eli dot friedman at gmail

Originally committed as revision 23842 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Eli Friedman, eli dot friedman at gmail

Originally committed as revision 23841 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23840 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23839 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23838 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23837 to svn://svn.ffmpeg.org/ffmpeg/trunk