3 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
4 * Copyright (c) 2004 Alex Beregszaszi
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 * exp golomb vlc stuff
29 * @author Michael Niedermayer <michaelni@gmx.at> and Alex Beregszaszi
34 * read unsigned golomb rice code (jpegls).
36 static inline int get_ur_golomb_jpegls(GetBitContext
*gb
, int k
, int limit
, int esc_len
){
42 buf
=GET_CACHE(re
, gb
);
46 if(log
- k
>= 32-MIN_CACHE_BITS
+(MIN_CACHE_BITS
==32) && 32-log
< limit
){
49 LAST_SKIP_BITS(re
, gb
, 32 + k
- log
);
55 for(i
=0; SHOW_UBITS(re
, gb
, 1) == 0; i
++){
56 LAST_SKIP_BITS(re
, gb
, 1);
63 buf
= SHOW_UBITS(re
, gb
, k
);
64 LAST_SKIP_BITS(re
, gb
, k
);
71 }else if(i
== limit
- 1){
72 buf
= SHOW_UBITS(re
, gb
, esc_len
);
73 LAST_SKIP_BITS(re
, gb
, esc_len
);
83 * read signed golomb rice code (flac).
85 static inline int get_sr_golomb_flac(GetBitContext
*gb
, int k
, int limit
, int esc_len
){
86 int v
= get_ur_golomb_jpegls(gb
, k
, limit
, esc_len
);
87 return (v
>>1) ^ -(v
&1);
91 * read unsigned golomb rice code (shorten).
93 #define get_ur_golomb_shorten(gb, k) get_ur_golomb_jpegls(gb, k, INT_MAX, 0)
95 static inline unsigned int get_ur_golomb_shorten(GetBitContext *gb, int k){
96 return get_ur_golomb_jpegls(gb, k, INT_MAX, 0);
101 * read signed golomb rice code (shorten).
103 static inline int get_sr_golomb_shorten(GetBitContext
* gb
, int k
)
105 int uvar
= get_ur_golomb_jpegls(gb
, k
+ 1, INT_MAX
, 0);