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copy get_unary from vc1

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Originally committed as revision 9994 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alex Beregszaszi 2007-08-08 20:38:30 +00:00
parent ec5dc2c1af
commit 971e878dca
1 changed files with 46 additions and 0 deletions
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46
libavcodec/bitstream.h
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@ -969,4 +969,50 @@ static inline int decode012(GetBitContext *gb){
return get_bits1(gb) + 1;
}
/**
* Get unary code of limited length
* @todo FIXME Slow and ugly
* @param gb GetBitContext
* @param[in] stop The bitstop value (unary code of 1's or 0's)
* @param[in] len Maximum length
* @return Unary length/index
*/
static int get_unary(GetBitContext *gb, int stop, int len)
{
#if 1
int i;
for(i = 0; i < len && get_bits1(gb) != stop; i++);
return i;
/* int i = 0, tmp = !stop;
while (i != len && tmp != stop)
{
tmp = get_bits(gb, 1);
i++;
}
if (i == len && tmp != stop) return len+1;
return i;*/
#else
unsigned int buf;
int log;
OPEN_READER(re, gb);
UPDATE_CACHE(re, gb);
buf=GET_CACHE(re, gb); //Still not sure
if (stop) buf = ~buf;
log= av_log2(-buf); //FIXME: -?
if (log < limit){
LAST_SKIP_BITS(re, gb, log+1);
CLOSE_READER(re, gb);
return log;
}
LAST_SKIP_BITS(re, gb, limit);
CLOSE_READER(re, gb);
return limit;
#endif
}
#endif /* BITSTREAM_H */