fixes decoding of MR2_MW_A.264

Originally committed as revision 3916 to svn://svn.ffmpeg.org/ffmpeg/trunk

- no more error with norm6 codes
- almost skipped frames (~110 bits) are not overflowed
However:
- there are very few bits left in those frames, so I wonder if enough MB
data is actually left
- NORM6/DIFF6 (4/5) bitplanes are a lot more present, which I don't find
obvious.
patch by anonymous

Originally committed as revision 3915 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3914 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 14631 to svn://svn.mplayerhq.hu/mplayer/trunk/postproc

Originally committed as revision 3913 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3912 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3911 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 14626 to svn://svn.mplayerhq.hu/mplayer/trunk/postproc

Originally committed as revision 3910 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3909 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3908 to svn://svn.ffmpeg.org/ffmpeg/trunk

100000l (typos in the #define for selecting the NORM6 method -> wasnt compiled, after fixing typos new method doesnt even compile -> swicth back to old until its fixed)

Originally committed as revision 3907 to svn://svn.ffmpeg.org/ffmpeg/trunk

vc9data.h to select the behaviour
- modified decode_b_picture_primary_header so that
decode_bi_picture_header is no more required

Fixes:
- modifications for some more using of MpegEncContext
- fixed a bit frame type decoding
- switch from pointers to index for AC tables
- corrected P CBPCY decoding (p_cbpcy += 4)

patch by anonymous

Originally committed as revision 3906 to svn://svn.ffmpeg.org/ffmpeg/trunk

- avctx and gb elements were removed from VC9Context, hence a larger diff
- some code was added to h263dec.c regarding CODEC_ID_WMV3 (should apply to CODEC_ID_VC9 too)
- VLC tables and other related tables were made global whenever this seemed necessary; appropriate changes were therefore made to other parts of the code using those tables
- the change for the bitplane management to a struct (some of them should eventually be mapped to MpegEncContext arrays) wasn't associated with the proper frees; should be fixed now
patch by anonymous

better names for globalized tables by me

Originally committed as revision 3905 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3904 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3903 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3902 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3901 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3900 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3899 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3898 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3897 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3896 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3895 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3894 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3893 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3892 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3891 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3890 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3889 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3888 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3887 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3886 to svn://svn.ffmpeg.org/ffmpeg/trunk

mov header field and compressor name patch by Roine Gustafsson <roine AT users DOT sourceforge DOT net>

Originally committed as revision 3885 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3884 to svn://svn.ffmpeg.org/ffmpeg/trunk

check norm6 vlc validity as there are some bit sequences which dont corespond to any codeword, the other vlc tables all seem to be huffman tables though

Originally committed as revision 3883 to svn://svn.ffmpeg.org/ffmpeg/trunk

- i/p/b_decode_mbs functions now checks the proper values (from
bitplane). I didn't find it very clear, but it seems "raw" = "to read at
the MB layer". I used a structure, but we could spare that indirection and
add a flag in the VC9Context for each array.
- Properly decode (or so I think) the CBPCY (as it is predicted)
- many more things
patch by anonymous

Originally committed as revision 3882 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3881 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3880 to svn://svn.ffmpeg.org/ffmpeg/trunk

spliting row/colskip cases into their own functions as these will be needed for NORM/DIFF-6

Originally committed as revision 3879 to svn://svn.ffmpeg.org/ffmpeg/trunk