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source: vbox/trunk/src/libs/ffmpeg-20060710/libavcodec/golomb.h@ 10516

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1/*
2 * exp golomb vlc stuff
3 * Copyright (c) 2003 Michael Niedermayer <[email protected]>
4 * Copyright (c) 2004 Alex Beregszaszi
5 *
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.
10 *
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.
15 *
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
19 *
20 */
21
22/**
23 * @file golomb.h
24 * @brief
25 * exp golomb vlc stuff
26 * @author Michael Niedermayer <[email protected]> and Alex Beregszaszi
27 */
28
29#define INVALID_VLC 0x80000000
30
31extern const uint8_t ff_golomb_vlc_len[512];
32extern const uint8_t ff_ue_golomb_vlc_code[512];
33extern const int8_t ff_se_golomb_vlc_code[512];
34extern const uint8_t ff_ue_golomb_len[256];
35
36extern const uint8_t ff_interleaved_golomb_vlc_len[256];
37extern const uint8_t ff_interleaved_ue_golomb_vlc_code[256];
38extern const int8_t ff_interleaved_se_golomb_vlc_code[256];
39
40
41 /**
42 * read unsigned exp golomb code.
43 */
44static inline int get_ue_golomb(GetBitContext *gb){
45 unsigned int buf;
46 int log;
47
48 OPEN_READER(re, gb);
49 UPDATE_CACHE(re, gb);
50 buf=GET_CACHE(re, gb);
51
52 if(buf >= (1<<27)){
53 buf >>= 32 - 9;
54 LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]);
55 CLOSE_READER(re, gb);
56
57 return ff_ue_golomb_vlc_code[buf];
58 }else{
59 log= 2*av_log2(buf) - 31;
60 buf>>= log;
61 buf--;
62 LAST_SKIP_BITS(re, gb, 32 - log);
63 CLOSE_READER(re, gb);
64
65 return buf;
66 }
67}
68
69static inline int svq3_get_ue_golomb(GetBitContext *gb){
70 uint32_t buf;
71 int log;
72
73 OPEN_READER(re, gb);
74 UPDATE_CACHE(re, gb);
75 buf=GET_CACHE(re, gb);
76
77 if(buf&0xAA800000){
78 buf >>= 32 - 8;
79 LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]);
80 CLOSE_READER(re, gb);
81
82 return ff_interleaved_ue_golomb_vlc_code[buf];
83 }else{
84 LAST_SKIP_BITS(re, gb, 8);
85 UPDATE_CACHE(re, gb);
86 buf |= 1 | (GET_CACHE(re, gb) >> 8);
87
88 if((buf & 0xAAAAAAAA) == 0)
89 return INVALID_VLC;
90
91 for(log=31; (buf & 0x80000000) == 0; log--){
92 buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30);
93 }
94
95 LAST_SKIP_BITS(re, gb, 63 - 2*log - 8);
96 CLOSE_READER(re, gb);
97
98 return ((buf << log) >> log) - 1;
99 }
100}
101
102/**
103 * read unsigned truncated exp golomb code.
104 */
105static inline int get_te0_golomb(GetBitContext *gb, int range){
106 assert(range >= 1);
107
108 if(range==1) return 0;
109 else if(range==2) return get_bits1(gb)^1;
110 else return get_ue_golomb(gb);
111}
112
113/**
114 * read unsigned truncated exp golomb code.
115 */
116static inline int get_te_golomb(GetBitContext *gb, int range){
117 assert(range >= 1);
118
119 if(range==2) return get_bits1(gb)^1;
120 else return get_ue_golomb(gb);
121}
122
123
124/**
125 * read signed exp golomb code.
126 */
127static inline int get_se_golomb(GetBitContext *gb){
128 unsigned int buf;
129 int log;
130
131 OPEN_READER(re, gb);
132 UPDATE_CACHE(re, gb);
133 buf=GET_CACHE(re, gb);
134
135 if(buf >= (1<<27)){
136 buf >>= 32 - 9;
137 LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]);
138 CLOSE_READER(re, gb);
139
140 return ff_se_golomb_vlc_code[buf];
141 }else{
142 log= 2*av_log2(buf) - 31;
143 buf>>= log;
144
145 LAST_SKIP_BITS(re, gb, 32 - log);
146 CLOSE_READER(re, gb);
147
148 if(buf&1) buf= -(buf>>1);
149 else buf= (buf>>1);
150
151 return buf;
152 }
153}
154
155static inline int svq3_get_se_golomb(GetBitContext *gb){
156 unsigned int buf;
157 int log;
158
159 OPEN_READER(re, gb);
160 UPDATE_CACHE(re, gb);
161 buf=GET_CACHE(re, gb);
162
163 if(buf&0xAA800000){
164 buf >>= 32 - 8;
165 LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]);
166 CLOSE_READER(re, gb);
167
168 return ff_interleaved_se_golomb_vlc_code[buf];
169 }else{
170 LAST_SKIP_BITS(re, gb, 8);
171 UPDATE_CACHE(re, gb);
172 buf |= 1 | (GET_CACHE(re, gb) >> 8);
173
174 if((buf & 0xAAAAAAAA) == 0)
175 return INVALID_VLC;
176
177 for(log=31; (buf & 0x80000000) == 0; log--){
178 buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30);
179 }
180
181 LAST_SKIP_BITS(re, gb, 63 - 2*log - 8);
182 CLOSE_READER(re, gb);
183
184 return (signed) (((((buf << log) >> log) - 1) ^ -(buf & 0x1)) + 1) >> 1;
185 }
186}
187
188/**
189 * read unsigned golomb rice code (ffv1).
190 */
191static inline int get_ur_golomb(GetBitContext *gb, int k, int limit, int esc_len){
192 unsigned int buf;
193 int log;
194
195 OPEN_READER(re, gb);
196 UPDATE_CACHE(re, gb);
197 buf=GET_CACHE(re, gb);
198
199 log= av_log2(buf);
200
201 if(log > 31-limit){
202 buf >>= log - k;
203 buf += (30-log)<<k;
204 LAST_SKIP_BITS(re, gb, 32 + k - log);
205 CLOSE_READER(re, gb);
206
207 return buf;
208 }else{
209 buf >>= 32 - limit - esc_len;
210 LAST_SKIP_BITS(re, gb, esc_len + limit);
211 CLOSE_READER(re, gb);
212
213 return buf + limit - 1;
214 }
215}
216
217/**
218 * read unsigned golomb rice code (jpegls).
219 */
220static inline int get_ur_golomb_jpegls(GetBitContext *gb, int k, int limit, int esc_len){
221 unsigned int buf;
222 int log;
223
224 OPEN_READER(re, gb);
225 UPDATE_CACHE(re, gb);
226 buf=GET_CACHE(re, gb);
227
228 log= av_log2(buf);
229
230 if(log > 31-11){
231 buf >>= log - k;
232 buf += (30-log)<<k;
233 LAST_SKIP_BITS(re, gb, 32 + k - log);
234 CLOSE_READER(re, gb);
235
236 return buf;
237 }else{
238 int i;
239 for(i=0; SHOW_UBITS(re, gb, 1) == 0; i++){
240 LAST_SKIP_BITS(re, gb, 1);
241 UPDATE_CACHE(re, gb);
242 }
243 SKIP_BITS(re, gb, 1);
244
245 if(i < limit - 1){
246 if(k){
247 buf = SHOW_UBITS(re, gb, k);
248 LAST_SKIP_BITS(re, gb, k);
249 }else{
250 buf=0;
251 }
252
253 CLOSE_READER(re, gb);
254 return buf + (i<<k);
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);
259
260 return buf + 1;
261 }else
262 return -1;
263 }
264}
265
266/**
267 * read signed golomb rice code (ffv1).
268 */
269static 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);
271
272 v++;
273 if (v&1) return v>>1;
274 else return -(v>>1);
275
276// return (v>>1) ^ -(v&1);
277}
278
279/**
280 * read signed golomb rice code (flac).
281 */
282static 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);
285}
286
287/**
288 * read unsigned golomb rice code (shorten).
289 */
290static inline unsigned int get_ur_golomb_shorten(GetBitContext *gb, int k){
291 return get_ur_golomb_jpegls(gb, k, INT_MAX, 0);
292}
293
294/**
295 * read signed golomb rice code (shorten).
296 */
297static inline int get_sr_golomb_shorten(GetBitContext* gb, int k)
298{
299 int uvar = get_ur_golomb_jpegls(gb, k + 1, INT_MAX, 0);
300 if (uvar & 1)
301 return ~(uvar >> 1);
302 else
303 return uvar >> 1;
304}
305
306
307
308#ifdef TRACE
309
310static 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);
316
317 print_bin(bits, len);
318
319 av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d ue @%5d in %s %s:%d\n", bits, len, i, pos, file, func, line);
320
321 return i;
322}
323
324static 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);
330
331 print_bin(bits, len);
332
333 av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d se @%5d in %s %s:%d\n", bits, len, i, pos, file, func, line);
334
335 return i;
336}
337
338static 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);
344
345 print_bin(bits, len);
346
347 av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d te @%5d in %s %s:%d\n", bits, len, i, pos, file, func, line);
348
349 return i;
350}
351
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__)
356
357#endif
358
359/**
360 * write unsigned exp golomb code.
361 */
362static inline void set_ue_golomb(PutBitContext *pb, int i){
363 int e;
364
365 assert(i>=0);
366
367#if 0
368 if(i=0){
369 put_bits(pb, 1, 1);
370 return;
371 }
372#endif
373 if(i<256)
374 put_bits(pb, ff_ue_golomb_len[i], i+1);
375 else{
376 e= av_log2(i+1);
377
378 put_bits(pb, 2*e+1, i+1);
379 }
380}
381
382/**
383 * write truncated unsigned exp golomb code.
384 */
385static inline void set_te_golomb(PutBitContext *pb, int i, int range){
386 assert(range >= 1);
387 assert(i<=range);
388
389 if(range==2) put_bits(pb, 1, i^1);
390 else set_ue_golomb(pb, i);
391}
392
393/**
394 * write signed exp golomb code. 16 bits at most.
395 */
396static 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);
399#if 0
400 if(i<=0) i= -2*i;
401 else i= 2*i-1;
402#elif 1
403 i= 2*i-1;
404 if(i<0) i^= -1; //FIXME check if gcc does the right thing
405#else
406 i= 2*i-1;
407 i^= (i>>31);
408#endif
409 set_ue_golomb(pb, i);
410}
411
412/**
413 * write unsigned golomb rice code (ffv1).
414 */
415static inline void set_ur_golomb(PutBitContext *pb, int i, int k, int limit, int esc_len){
416 int e;
417
418 assert(i>=0);
419
420 e= i>>k;
421 if(e<limit){
422 put_bits(pb, e + k + 1, (1<<k) + (i&((1<<k)-1)));
423 }else{
424 put_bits(pb, limit + esc_len, i - limit + 1);
425 }
426}
427
428/**
429 * write unsigned golomb rice code (jpegls).
430 */
431static inline void set_ur_golomb_jpegls(PutBitContext *pb, int i, int k, int limit, int esc_len){
432 int e;
433
434 assert(i>=0);
435
436 e= (i>>k) + 1;
437 if(e<limit){
438 while(e > 31) {
439 put_bits(pb, 31, 0);
440 e -= 31;
441 }
442 put_bits(pb, e, 1);
443 if(k)
444 put_bits(pb, k, i&((1<<k)-1));
445 }else{
446 put_bits(pb, limit , 1);
447 put_bits(pb, esc_len, i - 1);
448 }
449}
450
451/**
452 * write signed golomb rice code (ffv1).
453 */
454static inline void set_sr_golomb(PutBitContext *pb, int i, int k, int limit, int esc_len){
455 int v;
456
457 v = -2*i-1;
458 v ^= (v>>31);
459
460 set_ur_golomb(pb, v, k, limit, esc_len);
461}
462
463/**
464 * write signed golomb rice code (flac).
465 */
466static inline void set_sr_golomb_flac(PutBitContext *pb, int i, int k, int limit, int esc_len){
467 int v;
468
469 v = -2*i-1;
470 v ^= (v>>31);
471
472 set_ur_golomb_jpegls(pb, v, k, limit, esc_len);
473}
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