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path: root/drivers/amvdec_ports/utils/golomb.h (plain)
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1#ifndef AVCODEC_GOLOMB_H
2#define AVCODEC_GOLOMB_H
3
4#include <linux/kernel.h>
5#include <linux/types.h>
6
7#include "get_bits.h"
8#include "put_bits.h"
9#include "common.h"
10
11#define INVALID_VLC 0x80000000
12
13extern const u8 ff_golomb_vlc_len[512];
14extern const u8 ff_ue_golomb_vlc_code[512];
15extern const char ff_se_golomb_vlc_code[512];
16extern const u8 ff_ue_golomb_len[256];
17
18extern const u8 ff_interleaved_golomb_vlc_len[256];
19extern const u8 ff_interleaved_ue_golomb_vlc_code[256];
20extern const char ff_interleaved_se_golomb_vlc_code[256];
21extern const u8 ff_interleaved_dirac_golomb_vlc_code[256];
22
23/**
24 * Read an u32 Exp-Golomb code in the range 0 to 8190.
25 *
26 * @returns the read value or a negative error code.
27 */
28static inline int get_ue_golomb(struct get_bits_context *gb)
29{
30 u32 buf;
31
32 OPEN_READER(re, gb);
33 UPDATE_CACHE(re, gb);
34 buf = GET_CACHE(re, gb);
35
36 if (buf >= (1 << 27)) {
37 buf >>= 32 - 9;
38 LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]);
39 CLOSE_READER(re, gb);
40
41 return ff_ue_golomb_vlc_code[buf];
42 } else {
43 int log = 2 * av_log2(buf) - 31;
44 LAST_SKIP_BITS(re, gb, 32 - log);
45 CLOSE_READER(re, gb);
46 if (log < 7) {
47 pr_err("Invalid UE golomb code\n");
48 return -1;
49 }
50 buf >>= log;
51 buf--;
52
53 return buf;
54 }
55}
56
57/**
58 * Read an u32 Exp-Golomb code in the range 0 to UINT_MAX-1.
59 */
60static inline u32 get_ue_golomb_long(struct get_bits_context *gb)
61{
62 u32 buf, log;
63
64 buf = show_bits_long(gb, 32);
65 log = 31 - av_log2(buf);
66 skip_bits_long(gb, log);
67
68 return get_bits_long(gb, log + 1) - 1;
69}
70
71/**
72 * read u32 exp golomb code, constraint to a max of 31.
73 * the return value is undefined if the stored value exceeds 31.
74 */
75static inline int get_ue_golomb_31(struct get_bits_context *gb)
76{
77 u32 buf;
78
79 OPEN_READER(re, gb);
80 UPDATE_CACHE(re, gb);
81 buf = GET_CACHE(re, gb);
82
83 buf >>= 32 - 9;
84 LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]);
85 CLOSE_READER(re, gb);
86
87 return ff_ue_golomb_vlc_code[buf];
88}
89
90static inline u32 get_interleaved_ue_golomb(struct get_bits_context *gb)
91{
92 u32 buf;
93
94 OPEN_READER(re, gb);
95 UPDATE_CACHE(re, gb);
96 buf = GET_CACHE(re, gb);
97
98 if (buf & 0xAA800000) {
99 buf >>= 32 - 8;
100 LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]);
101 CLOSE_READER(re, gb);
102
103 return ff_interleaved_ue_golomb_vlc_code[buf];
104 } else {
105 u32 ret = 1;
106
107 do {
108 buf >>= 32 - 8;
109 LAST_SKIP_BITS(re, gb,
110 FFMIN(ff_interleaved_golomb_vlc_len[buf], 8));
111
112 if (ff_interleaved_golomb_vlc_len[buf] != 9) {
113 ret <<= (ff_interleaved_golomb_vlc_len[buf] - 1) >> 1;
114 ret |= ff_interleaved_dirac_golomb_vlc_code[buf];
115 break;
116 }
117 ret = (ret << 4) | ff_interleaved_dirac_golomb_vlc_code[buf];
118 UPDATE_CACHE(re, gb);
119 buf = GET_CACHE(re, gb);
120 } while (ret<0x8000000U && BITS_AVAILABLE(re, gb));
121
122 CLOSE_READER(re, gb);
123 return ret - 1;
124 }
125}
126
127/**
128 * read u32 truncated exp golomb code.
129 */
130static inline int get_te0_golomb(struct get_bits_context *gb, int range)
131{
132 if (range == 1)
133 return 0;
134 else if (range == 2)
135 return get_bits1(gb) ^ 1;
136 else
137 return get_ue_golomb(gb);
138}
139
140/**
141 * read u32 truncated exp golomb code.
142 */
143static inline int get_te_golomb(struct get_bits_context *gb, int range)
144{
145 if (range == 2)
146 return get_bits1(gb) ^ 1;
147 else
148 return get_ue_golomb(gb);
149}
150
151/**
152 * read signed exp golomb code.
153 */
154static inline int get_se_golomb(struct get_bits_context *gb)
155{
156 u32 buf;
157
158 OPEN_READER(re, gb);
159 UPDATE_CACHE(re, gb);
160 buf = GET_CACHE(re, gb);
161
162 if (buf >= (1 << 27)) {
163 buf >>= 32 - 9;
164 LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]);
165 CLOSE_READER(re, gb);
166
167 return ff_se_golomb_vlc_code[buf];
168 } else {
169 int log = av_log2(buf), sign;
170 LAST_SKIP_BITS(re, gb, 31 - log);
171 UPDATE_CACHE(re, gb);
172 buf = GET_CACHE(re, gb);
173
174 buf >>= log;
175
176 LAST_SKIP_BITS(re, gb, 32 - log);
177 CLOSE_READER(re, gb);
178
179 sign = -(buf & 1);
180 buf = ((buf >> 1) ^ sign) - sign;
181
182 return buf;
183 }
184}
185
186static inline int get_se_golomb_long(struct get_bits_context *gb)
187{
188 u32 buf = get_ue_golomb_long(gb);
189 int sign = (buf & 1) - 1;
190
191 return ((buf >> 1) ^ sign) + 1;
192}
193
194static inline int get_interleaved_se_golomb(struct get_bits_context *gb)
195{
196 u32 buf;
197
198 OPEN_READER(re, gb);
199 UPDATE_CACHE(re, gb);
200 buf = GET_CACHE(re, gb);
201
202 if (buf & 0xAA800000) {
203 buf >>= 32 - 8;
204 LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]);
205 CLOSE_READER(re, gb);
206
207 return ff_interleaved_se_golomb_vlc_code[buf];
208 } else {
209 int log;
210 LAST_SKIP_BITS(re, gb, 8);
211 UPDATE_CACHE(re, gb);
212 buf |= 1 | (GET_CACHE(re, gb) >> 8);
213
214 if ((buf & 0xAAAAAAAA) == 0)
215 return INVALID_VLC;
216
217 for (log = 31; (buf & 0x80000000) == 0; log--)
218 buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30);
219
220 LAST_SKIP_BITS(re, gb, 63 - 2 * log - 8);
221 CLOSE_READER(re, gb);
222 return (signed) (((((buf << log) >> log) - 1) ^ -(buf & 0x1)) + 1) >> 1;
223 }
224}
225
226static inline int dirac_get_se_golomb(struct get_bits_context *gb)
227{
228 u32 ret = get_interleaved_ue_golomb(gb);
229
230 if (ret) {
231 int sign = -get_bits1(gb);
232 ret = (ret ^ sign) - sign;
233 }
234
235 return ret;
236}
237
238/**
239 * read u32 golomb rice code (ffv1).
240 */
241static inline int get_ur_golomb(struct get_bits_context *gb,
242 int k, int limit, int esc_len)
243{
244 u32 buf;
245 int log;
246
247 OPEN_READER(re, gb);
248 UPDATE_CACHE(re, gb);
249 buf = GET_CACHE(re, gb);
250
251 log = av_log2(buf);
252
253 if (log > 31 - limit) {
254 buf >>= log - k;
255 buf += (30U - log) << k;
256 LAST_SKIP_BITS(re, gb, 32 + k - log);
257 CLOSE_READER(re, gb);
258
259 return buf;
260 } else {
261 LAST_SKIP_BITS(re, gb, limit);
262 UPDATE_CACHE(re, gb);
263
264 buf = SHOW_UBITS(re, gb, esc_len);
265
266 LAST_SKIP_BITS(re, gb, esc_len);
267 CLOSE_READER(re, gb);
268
269 return buf + limit - 1;
270 }
271}
272
273/**
274 * read u32 golomb rice code (jpegls).
275 */
276static inline int get_ur_golomb_jpegls(struct get_bits_context *gb,
277 int k, int limit, int esc_len)
278{
279 u32 buf;
280 int log;
281
282 OPEN_READER(re, gb);
283 UPDATE_CACHE(re, gb);
284 buf = GET_CACHE(re, gb);
285
286 log = av_log2(buf);
287
288 if (log - k >= 32 - MIN_CACHE_BITS + (MIN_CACHE_BITS == 32) &&
289 32 - log < limit) {
290 buf >>= log - k;
291 buf += (30U - log) << k;
292 LAST_SKIP_BITS(re, gb, 32 + k - log);
293 CLOSE_READER(re, gb);
294
295 return buf;
296 } else {
297 int i;
298 for (i = 0; i + MIN_CACHE_BITS <= limit && SHOW_UBITS(re, gb, MIN_CACHE_BITS) == 0; i += MIN_CACHE_BITS) {
299 if (gb->size_in_bits <= re_index) {
300 CLOSE_READER(re, gb);
301 return -1;
302 }
303 LAST_SKIP_BITS(re, gb, MIN_CACHE_BITS);
304 UPDATE_CACHE(re, gb);
305 }
306 for (; i < limit && SHOW_UBITS(re, gb, 1) == 0; i++) {
307 SKIP_BITS(re, gb, 1);
308 }
309 LAST_SKIP_BITS(re, gb, 1);
310 UPDATE_CACHE(re, gb);
311
312 if (i < limit - 1) {
313 if (k) {
314 if (k > MIN_CACHE_BITS - 1) {
315 buf = SHOW_UBITS(re, gb, 16) << (k-16);
316 LAST_SKIP_BITS(re, gb, 16);
317 UPDATE_CACHE(re, gb);
318 buf |= SHOW_UBITS(re, gb, k-16);
319 LAST_SKIP_BITS(re, gb, k-16);
320 } else {
321 buf = SHOW_UBITS(re, gb, k);
322 LAST_SKIP_BITS(re, gb, k);
323 }
324 } else {
325 buf = 0;
326 }
327 buf += ((u32)i << k);
328 } else if (i == limit - 1) {
329 buf = SHOW_UBITS(re, gb, esc_len);
330 LAST_SKIP_BITS(re, gb, esc_len);
331
332 buf ++;
333 } else {
334 buf = -1;
335 }
336 CLOSE_READER(re, gb);
337 return buf;
338 }
339}
340
341/**
342 * read signed golomb rice code (ffv1).
343 */
344static inline int get_sr_golomb(struct get_bits_context *gb,
345 int k, int limit, int esc_len)
346{
347 u32 v = get_ur_golomb(gb, k, limit, esc_len);
348
349 return (v >> 1) ^ -(v & 1);
350}
351
352/**
353 * read signed golomb rice code (flac).
354 */
355static inline int get_sr_golomb_flac(struct get_bits_context *gb,
356 int k, int limit, int esc_len)
357{
358 u32 v = get_ur_golomb_jpegls(gb, k, limit, esc_len);
359
360 return (v >> 1) ^ -(v & 1);
361}
362
363/**
364 * read u32 golomb rice code (shorten).
365 */
366static inline u32 get_ur_golomb_shorten(struct get_bits_context *gb, int k)
367{
368 return get_ur_golomb_jpegls(gb, k, INT_MAX, 0);
369}
370
371/**
372 * read signed golomb rice code (shorten).
373 */
374static inline int get_sr_golomb_shorten(struct get_bits_context *gb, int k)
375{
376 int uvar = get_ur_golomb_jpegls(gb, k + 1, INT_MAX, 0);
377
378 return (uvar >> 1) ^ -(uvar & 1);
379}
380
381/**
382 * write u32 exp golomb code. 2^16 - 2 at most
383 */
384static inline void set_ue_golomb(struct put_bits_context *pb, int i)
385{
386 if (i < 256)
387 put_bits(pb, ff_ue_golomb_len[i], i + 1);
388 else {
389 int e = av_log2(i + 1);
390 put_bits(pb, 2 * e + 1, i + 1);
391 }
392}
393
394/**
395 * write u32 exp golomb code. 2^32-2 at most.
396 */
397static inline void set_ue_golomb_long(struct put_bits_context *pb, u32 i)
398{
399 if (i < 256)
400 put_bits(pb, ff_ue_golomb_len[i], i + 1);
401 else {
402 int e = av_log2(i + 1);
403 put_bits64(pb, 2 * e + 1, i + 1);
404 }
405}
406
407/**
408 * write truncated u32 exp golomb code.
409 */
410static inline void set_te_golomb(struct put_bits_context *pb, int i, int range)
411{
412 if (range == 2)
413 put_bits(pb, 1, i ^ 1);
414 else
415 set_ue_golomb(pb, i);
416}
417
418/**
419 * write signed exp golomb code. 16 bits at most.
420 */
421static inline void set_se_golomb(struct put_bits_context *pb, int i)
422{
423 i = 2 * i - 1;
424
425 if (i < 0)
426 i ^= -1; //FIXME check if gcc does the right thing
427 set_ue_golomb(pb, i);
428}
429
430/**
431 * write u32 golomb rice code (ffv1).
432 */
433static inline void set_ur_golomb(struct put_bits_context *pb, int i, int k, int limit,
434 int esc_len)
435{
436 int e;
437
438 e = i >> k;
439 if (e < limit)
440 put_bits(pb, e + k + 1, (1 << k) + av_mod_uintp2(i, k));
441 else
442 put_bits(pb, limit + esc_len, i - limit + 1);
443}
444
445/**
446 * write u32 golomb rice code (jpegls).
447 */
448static inline void set_ur_golomb_jpegls(struct put_bits_context *pb,
449 int i, int k, int limit, int esc_len)
450{
451 int e;
452
453 e = (i >> k) + 1;
454 if (e < limit) {
455 while (e > 31) {
456 put_bits(pb, 31, 0);
457 e -= 31;
458 }
459 put_bits(pb, e, 1);
460 if (k)
461 put_sbits(pb, k, i);
462 } else {
463 while (limit > 31) {
464 put_bits(pb, 31, 0);
465 limit -= 31;
466 }
467 put_bits(pb, limit, 1);
468 put_bits(pb, esc_len, i - 1);
469 }
470}
471
472/**
473 * write signed golomb rice code (ffv1).
474 */
475static inline void set_sr_golomb(struct put_bits_context *pb,
476 int i, int k, int limit, int esc_len)
477{
478 int v;
479
480 v = -2 * i - 1;
481 v ^= (v >> 31);
482
483 set_ur_golomb(pb, v, k, limit, esc_len);
484}
485
486/**
487 * write signed golomb rice code (flac).
488 */
489static inline void set_sr_golomb_flac(struct put_bits_context *pb,
490 int i, int k, int limit, int esc_len)
491{
492 int v;
493
494 v = -2 * i - 1;
495 v ^= (v >> 31);
496
497 set_ur_golomb_jpegls(pb, v, k, limit, esc_len);
498}
499
500#endif /* AVCODEC_GOLOMB_H */
501
generated by cgit at 2024-05-17 07:44:19 (GMT)