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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 * exp golomb vlc stuff
26 * @author Michael Niedermayer <michaelni@gmx.at> and Alex Beregszaszi
29 #define INVALID_VLC 0x80000000
31 extern const uint8_t ff_golomb_vlc_len[512];
32 extern const uint8_t ff_ue_golomb_vlc_code[512];
33 extern const int8_t ff_se_golomb_vlc_code[512];
34 extern const uint8_t ff_ue_golomb_len[256];
36 extern const uint8_t ff_interleaved_golomb_vlc_len[256];
37 extern const uint8_t ff_interleaved_ue_golomb_vlc_code[256];
38 extern const int8_t ff_interleaved_se_golomb_vlc_code[256];
42 * read unsigned exp golomb code.
44 static inline int get_ue_golomb(GetBitContext *gb){
50 buf=GET_CACHE(re, gb);
54 LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]);
57 return ff_ue_golomb_vlc_code[buf];
59 log= 2*av_log2(buf) - 31;
62 LAST_SKIP_BITS(re, gb, 32 - log);
69 static inline int svq3_get_ue_golomb(GetBitContext *gb){
75 buf=GET_CACHE(re, gb);
79 LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]);
82 return ff_interleaved_ue_golomb_vlc_code[buf];
84 LAST_SKIP_BITS(re, gb, 8);
86 buf |= 1 | (GET_CACHE(re, gb) >> 8);
88 if((buf & 0xAAAAAAAA) == 0)
91 for(log=31; (buf & 0x80000000) == 0; log--){
92 buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30);
95 LAST_SKIP_BITS(re, gb, 63 - 2*log - 8);
98 return ((buf << log) >> log) - 1;
103 * read unsigned truncated exp golomb code.
105 static inline int get_te0_golomb(GetBitContext *gb, int range){
108 if(range==1) return 0;
109 else if(range==2) return get_bits1(gb)^1;
110 else return get_ue_golomb(gb);
114 * read unsigned truncated exp golomb code.
116 static inline int get_te_golomb(GetBitContext *gb, int range){
119 if(range==2) return get_bits1(gb)^1;
120 else return get_ue_golomb(gb);
125 * read signed exp golomb code.
127 static inline int get_se_golomb(GetBitContext *gb){
132 UPDATE_CACHE(re, gb);
133 buf=GET_CACHE(re, gb);
137 LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]);
138 CLOSE_READER(re, gb);
140 return ff_se_golomb_vlc_code[buf];
142 log= 2*av_log2(buf) - 31;
145 LAST_SKIP_BITS(re, gb, 32 - log);
146 CLOSE_READER(re, gb);
148 if(buf&1) buf= -(buf>>1);
155 static inline int svq3_get_se_golomb(GetBitContext *gb){
160 UPDATE_CACHE(re, gb);
161 buf=GET_CACHE(re, gb);
165 LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]);
166 CLOSE_READER(re, gb);
168 return ff_interleaved_se_golomb_vlc_code[buf];
170 LAST_SKIP_BITS(re, gb, 8);
171 UPDATE_CACHE(re, gb);
172 buf |= 1 | (GET_CACHE(re, gb) >> 8);
174 if((buf & 0xAAAAAAAA) == 0)
177 for(log=31; (buf & 0x80000000) == 0; log--){
178 buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30);
181 LAST_SKIP_BITS(re, gb, 63 - 2*log - 8);
182 CLOSE_READER(re, gb);
184 return (signed) (((((buf << log) >> log) - 1) ^ -(buf & 0x1)) + 1) >> 1;
189 * read unsigned golomb rice code (ffv1).
191 static inline int get_ur_golomb(GetBitContext *gb, int k, int limit, int esc_len){
196 UPDATE_CACHE(re, gb);
197 buf=GET_CACHE(re, gb);
204 LAST_SKIP_BITS(re, gb, 32 + k - log);
205 CLOSE_READER(re, gb);
209 buf >>= 32 - limit - esc_len;
210 LAST_SKIP_BITS(re, gb, esc_len + limit);
211 CLOSE_READER(re, gb);
213 return buf + limit - 1;
218 * read unsigned golomb rice code (jpegls).
220 static inline int get_ur_golomb_jpegls(GetBitContext *gb, int k, int limit, int esc_len){
225 UPDATE_CACHE(re, gb);
226 buf=GET_CACHE(re, gb);
233 LAST_SKIP_BITS(re, gb, 32 + k - log);
234 CLOSE_READER(re, gb);
239 for(i=0; SHOW_UBITS(re, gb, 1) == 0; i++){
240 LAST_SKIP_BITS(re, gb, 1);
241 UPDATE_CACHE(re, gb);
243 SKIP_BITS(re, gb, 1);
247 buf = SHOW_UBITS(re, gb, k);
248 LAST_SKIP_BITS(re, gb, k);
253 CLOSE_READER(re, gb);
255 }else if(i == limit - 1){
256 buf = SHOW_UBITS(re, gb, esc_len);
257 LAST_SKIP_BITS(re, gb, esc_len);
258 CLOSE_READER(re, gb);
267 * read signed golomb rice code (ffv1).
269 static inline int get_sr_golomb(GetBitContext *gb, int k, int limit, int esc_len){
270 int v= get_ur_golomb(gb, k, limit, esc_len);
273 if (v&1) return v>>1;
276 // return (v>>1) ^ -(v&1);
280 * read signed golomb rice code (flac).
282 static inline int get_sr_golomb_flac(GetBitContext *gb, int k, int limit, int esc_len){
283 int v= get_ur_golomb_jpegls(gb, k, limit, esc_len);
284 return (v>>1) ^ -(v&1);
288 * read unsigned golomb rice code (shorten).
290 static inline unsigned int get_ur_golomb_shorten(GetBitContext *gb, int k){
291 return get_ur_golomb_jpegls(gb, k, INT_MAX, 0);
295 * read signed golomb rice code (shorten).
297 static inline int get_sr_golomb_shorten(GetBitContext* gb, int k)
299 int uvar = get_ur_golomb_jpegls(gb, k + 1, INT_MAX, 0);
310 static inline int get_ue(GetBitContext *s, char *file, const char *func, int line){
311 int show= show_bits(s, 24);
312 int pos= get_bits_count(s);
313 int i= get_ue_golomb(s);
314 int len= get_bits_count(s) - pos;
315 int bits= show>>(24-len);
317 print_bin(bits, len);
319 av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d ue @%5d in %s %s:%d\n", bits, len, i, pos, file, func, line);
324 static inline int get_se(GetBitContext *s, char *file, const char *func, int line){
325 int show= show_bits(s, 24);
326 int pos= get_bits_count(s);
327 int i= get_se_golomb(s);
328 int len= get_bits_count(s) - pos;
329 int bits= show>>(24-len);
331 print_bin(bits, len);
333 av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d se @%5d in %s %s:%d\n", bits, len, i, pos, file, func, line);
338 static inline int get_te(GetBitContext *s, int r, char *file, const char *func, int line){
339 int show= show_bits(s, 24);
340 int pos= get_bits_count(s);
341 int i= get_te0_golomb(s, r);
342 int len= get_bits_count(s) - pos;
343 int bits= show>>(24-len);
345 print_bin(bits, len);
347 av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d te @%5d in %s %s:%d\n", bits, len, i, pos, file, func, line);
352 #define get_ue_golomb(a) get_ue(a, __FILE__, __PRETTY_FUNCTION__, __LINE__)
353 #define get_se_golomb(a) get_se(a, __FILE__, __PRETTY_FUNCTION__, __LINE__)
354 #define get_te_golomb(a, r) get_te(a, r, __FILE__, __PRETTY_FUNCTION__, __LINE__)
355 #define get_te0_golomb(a, r) get_te(a, r, __FILE__, __PRETTY_FUNCTION__, __LINE__)
360 * write unsigned exp golomb code.
362 static inline void set_ue_golomb(PutBitContext *pb, int i){
374 put_bits(pb, ff_ue_golomb_len[i], i+1);
378 put_bits(pb, 2*e+1, i+1);
383 * write truncated unsigned exp golomb code.
385 static inline void set_te_golomb(PutBitContext *pb, int i, int range){
389 if(range==2) put_bits(pb, 1, i^1);
390 else set_ue_golomb(pb, i);
394 * write signed exp golomb code. 16 bits at most.
396 static inline void set_se_golomb(PutBitContext *pb, int i){
397 // if (i>32767 || i<-32767)
398 // av_log(NULL,AV_LOG_ERROR,"value out of range %d\n", i);
404 if(i<0) i^= -1; //FIXME check if gcc does the right thing
409 set_ue_golomb(pb, i);
413 * write unsigned golomb rice code (ffv1).
415 static inline void set_ur_golomb(PutBitContext *pb, int i, int k, int limit, int esc_len){
422 put_bits(pb, e + k + 1, (1<<k) + (i&((1<<k)-1)));
424 put_bits(pb, limit + esc_len, i - limit + 1);
429 * write unsigned golomb rice code (jpegls).
431 static inline void set_ur_golomb_jpegls(PutBitContext *pb, int i, int k, int limit, int esc_len){
440 put_bits(pb, k, i&((1<<k)-1));
442 put_bits(pb, limit , 1);
443 put_bits(pb, esc_len, i - 1);
448 * write signed golomb rice code (ffv1).
450 static inline void set_sr_golomb(PutBitContext *pb, int i, int k, int limit, int esc_len){
456 set_ur_golomb(pb, v, k, limit, esc_len);
460 * write signed golomb rice code (flac).
462 static inline void set_sr_golomb_flac(PutBitContext *pb, int i, int k, int limit, int esc_len){
468 set_ur_golomb_jpegls(pb, v, k, limit, esc_len);