mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 10240 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
parent
a41f4eacd6
commit
28296f9c9e
4 changed files with 74 additions and 46 deletions
@ -0,0 +1,72 @@ |
||||
/*
|
||||
* copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at> |
||||
* |
||||
* This file is part of FFmpeg. |
||||
* |
||||
* FFmpeg is free software; you can redistribute it and/or |
||||
* modify it under the terms of the GNU Lesser General Public |
||||
* License as published by the Free Software Foundation; either |
||||
* version 2.1 of the License, or (at your option) any later version. |
||||
* |
||||
* FFmpeg is distributed in the hope that it will be useful, |
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
||||
* Lesser General Public License for more details. |
||||
* |
||||
* You should have received a copy of the GNU Lesser General Public |
||||
* License along with FFmpeg; if not, write to the Free Software |
||||
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
||||
*/ |
||||
|
||||
#ifndef AVCODEC_UNARY_H |
||||
#define AVCODEC_UNARY_H |
||||
|
||||
#include "bitstream.h" |
||||
|
||||
/**
|
||||
* 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 /* AVCODEC_UNARY_H */ |
Loading…
Reference in new issue