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2ba45a60 DM |
1 | /* |
2 | * exp golomb vlc stuff | |
3 | * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> | |
4 | * Copyright (c) 2004 Alex Beregszaszi | |
5 | * | |
6 | * This file is part of FFmpeg. | |
7 | * | |
8 | * FFmpeg is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; either | |
11 | * version 2.1 of the License, or (at your option) any later version. | |
12 | * | |
13 | * FFmpeg is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with FFmpeg; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
21 | */ | |
22 | ||
23 | /** | |
24 | * @file | |
25 | * @brief | |
26 | * exp golomb vlc stuff | |
27 | * @author Michael Niedermayer <michaelni@gmx.at> and Alex Beregszaszi | |
28 | */ | |
29 | ||
30 | #ifndef AVCODEC_GOLOMB_H | |
31 | #define AVCODEC_GOLOMB_H | |
32 | ||
33 | #include <stdint.h> | |
34 | ||
35 | #include "get_bits.h" | |
36 | #include "put_bits.h" | |
37 | ||
38 | #define INVALID_VLC 0x80000000 | |
39 | ||
40 | extern const uint8_t ff_golomb_vlc_len[512]; | |
41 | extern const uint8_t ff_ue_golomb_vlc_code[512]; | |
42 | extern const int8_t ff_se_golomb_vlc_code[512]; | |
43 | extern const uint8_t ff_ue_golomb_len[256]; | |
44 | ||
45 | extern const uint8_t ff_interleaved_golomb_vlc_len[256]; | |
46 | extern const uint8_t ff_interleaved_ue_golomb_vlc_code[256]; | |
47 | extern const int8_t ff_interleaved_se_golomb_vlc_code[256]; | |
48 | extern const uint8_t ff_interleaved_dirac_golomb_vlc_code[256]; | |
49 | ||
50 | /** | |
51 | * read unsigned exp golomb code. | |
52 | */ | |
53 | static inline int get_ue_golomb(GetBitContext *gb) | |
54 | { | |
55 | unsigned int buf; | |
56 | ||
57 | OPEN_READER(re, gb); | |
58 | UPDATE_CACHE(re, gb); | |
59 | buf = GET_CACHE(re, gb); | |
60 | ||
61 | if (buf >= (1 << 27)) { | |
62 | buf >>= 32 - 9; | |
63 | LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]); | |
64 | CLOSE_READER(re, gb); | |
65 | ||
66 | return ff_ue_golomb_vlc_code[buf]; | |
67 | } else { | |
68 | int log = 2 * av_log2(buf) - 31; | |
69 | LAST_SKIP_BITS(re, gb, 32 - log); | |
70 | CLOSE_READER(re, gb); | |
71 | if (CONFIG_FTRAPV && log < 0) { | |
72 | av_log(0, AV_LOG_ERROR, "Invalid UE golomb code\n"); | |
73 | return AVERROR_INVALIDDATA; | |
74 | } | |
75 | buf >>= log; | |
76 | buf--; | |
77 | ||
78 | return buf; | |
79 | } | |
80 | } | |
81 | ||
82 | /** | |
83 | * Read an unsigned Exp-Golomb code in the range 0 to UINT32_MAX-1. | |
84 | */ | |
85 | static inline unsigned get_ue_golomb_long(GetBitContext *gb) | |
86 | { | |
87 | unsigned buf, log; | |
88 | ||
89 | buf = show_bits_long(gb, 32); | |
90 | log = 31 - av_log2(buf); | |
91 | skip_bits_long(gb, log); | |
92 | ||
93 | return get_bits_long(gb, log + 1) - 1; | |
94 | } | |
95 | ||
96 | /** | |
97 | * read unsigned exp golomb code, constraint to a max of 31. | |
98 | * the return value is undefined if the stored value exceeds 31. | |
99 | */ | |
100 | static inline int get_ue_golomb_31(GetBitContext *gb) | |
101 | { | |
102 | unsigned int buf; | |
103 | ||
104 | OPEN_READER(re, gb); | |
105 | UPDATE_CACHE(re, gb); | |
106 | buf = GET_CACHE(re, gb); | |
107 | ||
108 | buf >>= 32 - 9; | |
109 | LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]); | |
110 | CLOSE_READER(re, gb); | |
111 | ||
112 | return ff_ue_golomb_vlc_code[buf]; | |
113 | } | |
114 | ||
115 | static inline unsigned svq3_get_ue_golomb(GetBitContext *gb) | |
116 | { | |
117 | uint32_t buf; | |
118 | ||
119 | OPEN_READER(re, gb); | |
120 | UPDATE_CACHE(re, gb); | |
121 | buf = GET_CACHE(re, gb); | |
122 | ||
123 | if (buf & 0xAA800000) { | |
124 | buf >>= 32 - 8; | |
125 | LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]); | |
126 | CLOSE_READER(re, gb); | |
127 | ||
128 | return ff_interleaved_ue_golomb_vlc_code[buf]; | |
129 | } else { | |
130 | unsigned ret = 1; | |
131 | ||
132 | do { | |
133 | buf >>= 32 - 8; | |
134 | LAST_SKIP_BITS(re, gb, | |
135 | FFMIN(ff_interleaved_golomb_vlc_len[buf], 8)); | |
136 | ||
137 | if (ff_interleaved_golomb_vlc_len[buf] != 9) { | |
138 | ret <<= (ff_interleaved_golomb_vlc_len[buf] - 1) >> 1; | |
139 | ret |= ff_interleaved_dirac_golomb_vlc_code[buf]; | |
140 | break; | |
141 | } | |
142 | ret = (ret << 4) | ff_interleaved_dirac_golomb_vlc_code[buf]; | |
143 | UPDATE_CACHE(re, gb); | |
144 | buf = GET_CACHE(re, gb); | |
145 | } while (ret<0x8000000U && BITS_AVAILABLE(re, gb)); | |
146 | ||
147 | CLOSE_READER(re, gb); | |
148 | return ret - 1; | |
149 | } | |
150 | } | |
151 | ||
152 | /** | |
153 | * read unsigned truncated exp golomb code. | |
154 | */ | |
155 | static inline int get_te0_golomb(GetBitContext *gb, int range) | |
156 | { | |
157 | av_assert2(range >= 1); | |
158 | ||
159 | if (range == 1) | |
160 | return 0; | |
161 | else if (range == 2) | |
162 | return get_bits1(gb) ^ 1; | |
163 | else | |
164 | return get_ue_golomb(gb); | |
165 | } | |
166 | ||
167 | /** | |
168 | * read unsigned truncated exp golomb code. | |
169 | */ | |
170 | static inline int get_te_golomb(GetBitContext *gb, int range) | |
171 | { | |
172 | av_assert2(range >= 1); | |
173 | ||
174 | if (range == 2) | |
175 | return get_bits1(gb) ^ 1; | |
176 | else | |
177 | return get_ue_golomb(gb); | |
178 | } | |
179 | ||
180 | /** | |
181 | * read signed exp golomb code. | |
182 | */ | |
183 | static inline int get_se_golomb(GetBitContext *gb) | |
184 | { | |
185 | unsigned int buf; | |
186 | ||
187 | OPEN_READER(re, gb); | |
188 | UPDATE_CACHE(re, gb); | |
189 | buf = GET_CACHE(re, gb); | |
190 | ||
191 | if (buf >= (1 << 27)) { | |
192 | buf >>= 32 - 9; | |
193 | LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]); | |
194 | CLOSE_READER(re, gb); | |
195 | ||
196 | return ff_se_golomb_vlc_code[buf]; | |
197 | } else { | |
198 | int log = av_log2(buf); | |
199 | LAST_SKIP_BITS(re, gb, 31 - log); | |
200 | UPDATE_CACHE(re, gb); | |
201 | buf = GET_CACHE(re, gb); | |
202 | ||
203 | buf >>= log; | |
204 | ||
205 | LAST_SKIP_BITS(re, gb, 32 - log); | |
206 | CLOSE_READER(re, gb); | |
207 | ||
208 | if (buf & 1) | |
209 | buf = -(buf >> 1); | |
210 | else | |
211 | buf = (buf >> 1); | |
212 | ||
213 | return buf; | |
214 | } | |
215 | } | |
216 | ||
217 | static inline int get_se_golomb_long(GetBitContext *gb) | |
218 | { | |
219 | unsigned int buf = get_ue_golomb_long(gb); | |
220 | ||
221 | if (buf & 1) | |
222 | buf = (buf + 1) >> 1; | |
223 | else | |
224 | buf = -(buf >> 1); | |
225 | ||
226 | return buf; | |
227 | } | |
228 | ||
229 | static inline int svq3_get_se_golomb(GetBitContext *gb) | |
230 | { | |
231 | unsigned int buf; | |
232 | ||
233 | OPEN_READER(re, gb); | |
234 | UPDATE_CACHE(re, gb); | |
235 | buf = GET_CACHE(re, gb); | |
236 | ||
237 | if (buf & 0xAA800000) { | |
238 | buf >>= 32 - 8; | |
239 | LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]); | |
240 | CLOSE_READER(re, gb); | |
241 | ||
242 | return ff_interleaved_se_golomb_vlc_code[buf]; | |
243 | } else { | |
244 | int log; | |
245 | LAST_SKIP_BITS(re, gb, 8); | |
246 | UPDATE_CACHE(re, gb); | |
247 | buf |= 1 | (GET_CACHE(re, gb) >> 8); | |
248 | ||
249 | if ((buf & 0xAAAAAAAA) == 0) | |
250 | return INVALID_VLC; | |
251 | ||
252 | for (log = 31; (buf & 0x80000000) == 0; log--) | |
253 | buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30); | |
254 | ||
255 | LAST_SKIP_BITS(re, gb, 63 - 2 * log - 8); | |
256 | CLOSE_READER(re, gb); | |
257 | ||
258 | return (signed) (((((buf << log) >> log) - 1) ^ -(buf & 0x1)) + 1) >> 1; | |
259 | } | |
260 | } | |
261 | ||
262 | static inline int dirac_get_se_golomb(GetBitContext *gb) | |
263 | { | |
264 | uint32_t ret = svq3_get_ue_golomb(gb); | |
265 | ||
266 | if (ret) { | |
267 | uint32_t buf; | |
268 | OPEN_READER(re, gb); | |
269 | UPDATE_CACHE(re, gb); | |
270 | buf = SHOW_SBITS(re, gb, 1); | |
271 | LAST_SKIP_BITS(re, gb, 1); | |
272 | ret = (ret ^ buf) - buf; | |
273 | CLOSE_READER(re, gb); | |
274 | } | |
275 | ||
276 | return ret; | |
277 | } | |
278 | ||
279 | /** | |
280 | * read unsigned golomb rice code (ffv1). | |
281 | */ | |
282 | static inline int get_ur_golomb(GetBitContext *gb, int k, int limit, | |
283 | int esc_len) | |
284 | { | |
285 | unsigned int buf; | |
286 | int log; | |
287 | ||
288 | OPEN_READER(re, gb); | |
289 | UPDATE_CACHE(re, gb); | |
290 | buf = GET_CACHE(re, gb); | |
291 | ||
292 | log = av_log2(buf); | |
293 | ||
294 | if (log > 31 - limit) { | |
295 | buf >>= log - k; | |
296 | buf += (30 - log) << k; | |
297 | LAST_SKIP_BITS(re, gb, 32 + k - log); | |
298 | CLOSE_READER(re, gb); | |
299 | ||
300 | return buf; | |
301 | } else { | |
302 | LAST_SKIP_BITS(re, gb, limit); | |
303 | UPDATE_CACHE(re, gb); | |
304 | ||
305 | buf = SHOW_UBITS(re, gb, esc_len); | |
306 | ||
307 | LAST_SKIP_BITS(re, gb, esc_len); | |
308 | CLOSE_READER(re, gb); | |
309 | ||
310 | return buf + limit - 1; | |
311 | } | |
312 | } | |
313 | ||
314 | /** | |
315 | * read unsigned golomb rice code (jpegls). | |
316 | */ | |
317 | static inline int get_ur_golomb_jpegls(GetBitContext *gb, int k, int limit, | |
318 | int esc_len) | |
319 | { | |
320 | unsigned int buf; | |
321 | int log; | |
322 | ||
323 | OPEN_READER(re, gb); | |
324 | UPDATE_CACHE(re, gb); | |
325 | buf = GET_CACHE(re, gb); | |
326 | ||
327 | log = av_log2(buf); | |
328 | ||
329 | if (log - k >= 32 - MIN_CACHE_BITS + (MIN_CACHE_BITS == 32) && | |
330 | 32 - log < limit) { | |
331 | buf >>= log - k; | |
332 | buf += (30 - log) << k; | |
333 | LAST_SKIP_BITS(re, gb, 32 + k - log); | |
334 | CLOSE_READER(re, gb); | |
335 | ||
336 | return buf; | |
337 | } else { | |
338 | int i; | |
339 | for (i = 0; i < limit && SHOW_UBITS(re, gb, 1) == 0; i++) { | |
340 | if (gb->size_in_bits <= re_index) | |
341 | return -1; | |
342 | LAST_SKIP_BITS(re, gb, 1); | |
343 | UPDATE_CACHE(re, gb); | |
344 | } | |
345 | SKIP_BITS(re, gb, 1); | |
346 | ||
347 | if (i < limit - 1) { | |
348 | if (k) { | |
349 | buf = SHOW_UBITS(re, gb, k); | |
350 | LAST_SKIP_BITS(re, gb, k); | |
351 | } else { | |
352 | buf = 0; | |
353 | } | |
354 | ||
355 | CLOSE_READER(re, gb); | |
356 | return buf + (i << k); | |
357 | } else if (i == limit - 1) { | |
358 | buf = SHOW_UBITS(re, gb, esc_len); | |
359 | LAST_SKIP_BITS(re, gb, esc_len); | |
360 | CLOSE_READER(re, gb); | |
361 | ||
362 | return buf + 1; | |
363 | } else | |
364 | return -1; | |
365 | } | |
366 | } | |
367 | ||
368 | /** | |
369 | * read signed golomb rice code (ffv1). | |
370 | */ | |
371 | static inline int get_sr_golomb(GetBitContext *gb, int k, int limit, | |
372 | int esc_len) | |
373 | { | |
374 | int v = get_ur_golomb(gb, k, limit, esc_len); | |
375 | ||
376 | v++; | |
377 | if (v & 1) | |
378 | return v >> 1; | |
379 | else | |
380 | return -(v >> 1); | |
381 | ||
382 | // return (v>>1) ^ -(v&1); | |
383 | } | |
384 | ||
385 | /** | |
386 | * read signed golomb rice code (flac). | |
387 | */ | |
388 | static inline int get_sr_golomb_flac(GetBitContext *gb, int k, int limit, | |
389 | int esc_len) | |
390 | { | |
391 | int v = get_ur_golomb_jpegls(gb, k, limit, esc_len); | |
392 | return (v >> 1) ^ -(v & 1); | |
393 | } | |
394 | ||
395 | /** | |
396 | * read unsigned golomb rice code (shorten). | |
397 | */ | |
398 | static inline unsigned int get_ur_golomb_shorten(GetBitContext *gb, int k) | |
399 | { | |
400 | return get_ur_golomb_jpegls(gb, k, INT_MAX, 0); | |
401 | } | |
402 | ||
403 | /** | |
404 | * read signed golomb rice code (shorten). | |
405 | */ | |
406 | static inline int get_sr_golomb_shorten(GetBitContext *gb, int k) | |
407 | { | |
408 | int uvar = get_ur_golomb_jpegls(gb, k + 1, INT_MAX, 0); | |
409 | if (uvar & 1) | |
410 | return ~(uvar >> 1); | |
411 | else | |
412 | return uvar >> 1; | |
413 | } | |
414 | ||
415 | #ifdef TRACE | |
416 | ||
417 | static inline int get_ue(GetBitContext *s, const char *file, const char *func, | |
418 | int line) | |
419 | { | |
420 | int show = show_bits(s, 24); | |
421 | int pos = get_bits_count(s); | |
422 | int i = get_ue_golomb(s); | |
423 | int len = get_bits_count(s) - pos; | |
424 | int bits = show >> (24 - len); | |
425 | ||
426 | print_bin(bits, len); | |
427 | ||
428 | av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d ue @%5d in %s %s:%d\n", | |
429 | bits, len, i, pos, file, func, line); | |
430 | ||
431 | return i; | |
432 | } | |
433 | ||
434 | static inline int get_se(GetBitContext *s, const char *file, const char *func, | |
435 | int line) | |
436 | { | |
437 | int show = show_bits(s, 24); | |
438 | int pos = get_bits_count(s); | |
439 | int i = get_se_golomb(s); | |
440 | int len = get_bits_count(s) - pos; | |
441 | int bits = show >> (24 - len); | |
442 | ||
443 | print_bin(bits, len); | |
444 | ||
445 | av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d se @%5d in %s %s:%d\n", | |
446 | bits, len, i, pos, file, func, line); | |
447 | ||
448 | return i; | |
449 | } | |
450 | ||
451 | static inline int get_te(GetBitContext *s, int r, char *file, const char *func, | |
452 | int line) | |
453 | { | |
454 | int show = show_bits(s, 24); | |
455 | int pos = get_bits_count(s); | |
456 | int i = get_te0_golomb(s, r); | |
457 | int len = get_bits_count(s) - pos; | |
458 | int bits = show >> (24 - len); | |
459 | ||
460 | print_bin(bits, len); | |
461 | ||
462 | av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d te @%5d in %s %s:%d\n", | |
463 | bits, len, i, pos, file, func, line); | |
464 | ||
465 | return i; | |
466 | } | |
467 | ||
468 | #define get_ue_golomb(a) get_ue(a, __FILE__, __PRETTY_FUNCTION__, __LINE__) | |
469 | #define get_se_golomb(a) get_se(a, __FILE__, __PRETTY_FUNCTION__, __LINE__) | |
470 | #define get_te_golomb(a, r) get_te(a, r, __FILE__, __PRETTY_FUNCTION__, __LINE__) | |
471 | #define get_te0_golomb(a, r) get_te(a, r, __FILE__, __PRETTY_FUNCTION__, __LINE__) | |
472 | ||
473 | #endif /* TRACE */ | |
474 | ||
475 | /** | |
476 | * write unsigned exp golomb code. | |
477 | */ | |
478 | static inline void set_ue_golomb(PutBitContext *pb, int i) | |
479 | { | |
480 | av_assert2(i >= 0); | |
481 | ||
482 | #if 0 | |
483 | if (i = 0) { | |
484 | put_bits(pb, 1, 1); | |
485 | return; | |
486 | } | |
487 | #endif | |
488 | if (i < 256) | |
489 | put_bits(pb, ff_ue_golomb_len[i], i + 1); | |
490 | else { | |
491 | int e = av_log2(i + 1); | |
492 | put_bits(pb, 2 * e + 1, i + 1); | |
493 | } | |
494 | } | |
495 | ||
496 | /** | |
497 | * write truncated unsigned exp golomb code. | |
498 | */ | |
499 | static inline void set_te_golomb(PutBitContext *pb, int i, int range) | |
500 | { | |
501 | av_assert2(range >= 1); | |
502 | av_assert2(i <= range); | |
503 | ||
504 | if (range == 2) | |
505 | put_bits(pb, 1, i ^ 1); | |
506 | else | |
507 | set_ue_golomb(pb, i); | |
508 | } | |
509 | ||
510 | /** | |
511 | * write signed exp golomb code. 16 bits at most. | |
512 | */ | |
513 | static inline void set_se_golomb(PutBitContext *pb, int i) | |
514 | { | |
515 | #if 0 | |
516 | if (i <= 0) | |
517 | i = -2 * i; | |
518 | else | |
519 | i = 2 * i - 1; | |
520 | #elif 1 | |
521 | i = 2 * i - 1; | |
522 | if (i < 0) | |
523 | i ^= -1; //FIXME check if gcc does the right thing | |
524 | #else | |
525 | i = 2 * i - 1; | |
526 | i ^= (i >> 31); | |
527 | #endif | |
528 | set_ue_golomb(pb, i); | |
529 | } | |
530 | ||
531 | /** | |
532 | * write unsigned golomb rice code (ffv1). | |
533 | */ | |
534 | static inline void set_ur_golomb(PutBitContext *pb, int i, int k, int limit, | |
535 | int esc_len) | |
536 | { | |
537 | int e; | |
538 | ||
539 | av_assert2(i >= 0); | |
540 | ||
541 | e = i >> k; | |
542 | if (e < limit) | |
543 | put_bits(pb, e + k + 1, (1 << k) + (i & ((1 << k) - 1))); | |
544 | else | |
545 | put_bits(pb, limit + esc_len, i - limit + 1); | |
546 | } | |
547 | ||
548 | /** | |
549 | * write unsigned golomb rice code (jpegls). | |
550 | */ | |
551 | static inline void set_ur_golomb_jpegls(PutBitContext *pb, int i, int k, | |
552 | int limit, int esc_len) | |
553 | { | |
554 | int e; | |
555 | ||
556 | av_assert2(i >= 0); | |
557 | ||
558 | e = (i >> k) + 1; | |
559 | if (e < limit) { | |
560 | while (e > 31) { | |
561 | put_bits(pb, 31, 0); | |
562 | e -= 31; | |
563 | } | |
564 | put_bits(pb, e, 1); | |
565 | if (k) | |
566 | put_sbits(pb, k, i); | |
567 | } else { | |
568 | while (limit > 31) { | |
569 | put_bits(pb, 31, 0); | |
570 | limit -= 31; | |
571 | } | |
572 | put_bits(pb, limit, 1); | |
573 | put_bits(pb, esc_len, i - 1); | |
574 | } | |
575 | } | |
576 | ||
577 | /** | |
578 | * write signed golomb rice code (ffv1). | |
579 | */ | |
580 | static inline void set_sr_golomb(PutBitContext *pb, int i, int k, int limit, | |
581 | int esc_len) | |
582 | { | |
583 | int v; | |
584 | ||
585 | v = -2 * i - 1; | |
586 | v ^= (v >> 31); | |
587 | ||
588 | set_ur_golomb(pb, v, k, limit, esc_len); | |
589 | } | |
590 | ||
591 | /** | |
592 | * write signed golomb rice code (flac). | |
593 | */ | |
594 | static inline void set_sr_golomb_flac(PutBitContext *pb, int i, int k, | |
595 | int limit, int esc_len) | |
596 | { | |
597 | int v; | |
598 | ||
599 | v = -2 * i - 1; | |
600 | v ^= (v >> 31); | |
601 | ||
602 | set_ur_golomb_jpegls(pb, v, k, limit, esc_len); | |
603 | } | |
604 | ||
605 | #endif /* AVCODEC_GOLOMB_H */ |