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Make the special 4129 case for long-run bit strings a #define and explain it

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Originally committed as revision 21928 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
David Conrad 2010-02-21 00:10:51 +00:00
parent 33dbc1b7ca
commit ecb51b25bb
1 changed files with 6 additions and 1 deletions
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7
libavcodec/vp3.c
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@ -63,6 +63,11 @@ typedef struct Vp3Fragment {
#define SB_PARTIALLY_CODED 1
#define SB_FULLY_CODED 2
// This is the maximum length of a single long bit run that can be encoded
// for superblock coding or block qps. Theora special-cases this to read a
// bit instead of flipping the current bit to allow for runs longer than 4129.
#define MAXIMUM_LONG_BIT_RUN 4129
#define MODE_INTER_NO_MV 0
#define MODE_INTRA 1
#define MODE_INTER_PLUS_MV 2
@ -920,7 +925,7 @@ static int unpack_block_qpis(Vp3DecodeContext *s, GetBitContext *gb)
}
}
if (run_length == 4129)
if (run_length == MAXIMUM_LONG_BIT_RUN)
bit = get_bits1(gb);
else
bit ^= 1;