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author | Sean Bartell <wingedtachikoma@gmail.com> | 2011-06-25 21:32:25 -0400 |
---|---|---|
committer | Nils Wallménius <nils@rockbox.org> | 2012-04-25 22:13:20 +0200 |
commit | f40bfc9267b13b54e6379dfe7539447662879d24 (patch) | |
tree | 9b20069d5e62809ff434061ad730096836f916f2 /lib/rbcodec/codecs/libwmavoice/get_bits.h | |
parent | a0009907de7a0107d49040d8a180f140e2eff299 (diff) | |
download | rockbox-f40bfc9267b13b54e6379dfe7539447662879d24.tar.gz rockbox-f40bfc9267b13b54e6379dfe7539447662879d24.zip |
Add codecs to librbcodec.
Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97
Reviewed-on: http://gerrit.rockbox.org/137
Reviewed-by: Nils Wallménius <nils@rockbox.org>
Tested-by: Nils Wallménius <nils@rockbox.org>
Diffstat (limited to 'lib/rbcodec/codecs/libwmavoice/get_bits.h')
-rw-r--r-- | lib/rbcodec/codecs/libwmavoice/get_bits.h | 691 |
1 files changed, 691 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libwmavoice/get_bits.h b/lib/rbcodec/codecs/libwmavoice/get_bits.h new file mode 100644 index 0000000000..f4b3646e69 --- /dev/null +++ b/lib/rbcodec/codecs/libwmavoice/get_bits.h | |||
@@ -0,0 +1,691 @@ | |||
1 | /* | ||
2 | * copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at> | ||
3 | * | ||
4 | * This file is part of FFmpeg. | ||
5 | * | ||
6 | * FFmpeg 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 2.1 of the License, or (at your option) any later version. | ||
10 | * | ||
11 | * FFmpeg 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 FFmpeg; if not, write to the Free Software | ||
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
19 | */ | ||
20 | |||
21 | /** | ||
22 | * @file | ||
23 | * bitstream reader API header. | ||
24 | */ | ||
25 | |||
26 | #ifndef AVCODEC_GET_BITS_H | ||
27 | #define AVCODEC_GET_BITS_H | ||
28 | |||
29 | #include <stdint.h> | ||
30 | #include <stdlib.h> | ||
31 | #include <assert.h> | ||
32 | #include "libavutil/bswap.h" | ||
33 | #include "libavutil/common.h" | ||
34 | #include "libavutil/intreadwrite.h" | ||
35 | #include "libavutil/log.h" | ||
36 | #include "mathops.h" | ||
37 | |||
38 | #if defined(ALT_BITSTREAM_READER_LE) && !defined(ALT_BITSTREAM_READER) | ||
39 | # define ALT_BITSTREAM_READER | ||
40 | #endif | ||
41 | |||
42 | #if !defined(LIBMPEG2_BITSTREAM_READER) && !defined(A32_BITSTREAM_READER) && !defined(ALT_BITSTREAM_READER) | ||
43 | # if ARCH_ARM && !HAVE_FAST_UNALIGNED | ||
44 | # define A32_BITSTREAM_READER | ||
45 | # else | ||
46 | # define ALT_BITSTREAM_READER | ||
47 | //#define LIBMPEG2_BITSTREAM_READER | ||
48 | //#define A32_BITSTREAM_READER | ||
49 | # endif | ||
50 | #endif | ||
51 | |||
52 | /* bit input */ | ||
53 | /* buffer, buffer_end and size_in_bits must be present and used by every reader */ | ||
54 | typedef struct GetBitContext { | ||
55 | const uint8_t *buffer, *buffer_end; | ||
56 | #ifdef ALT_BITSTREAM_READER | ||
57 | int index; | ||
58 | #elif defined LIBMPEG2_BITSTREAM_READER | ||
59 | uint8_t *buffer_ptr; | ||
60 | uint32_t cache; | ||
61 | int bit_count; | ||
62 | #elif defined A32_BITSTREAM_READER | ||
63 | uint32_t *buffer_ptr; | ||
64 | uint32_t cache0; | ||
65 | uint32_t cache1; | ||
66 | int bit_count; | ||
67 | #endif | ||
68 | int size_in_bits; | ||
69 | } GetBitContext; | ||
70 | |||
71 | #define VLC_TYPE int16_t | ||
72 | |||
73 | typedef struct VLC { | ||
74 | int bits; | ||
75 | VLC_TYPE (*table)[2]; ///< code, bits | ||
76 | int table_size, table_allocated; | ||
77 | } VLC; | ||
78 | |||
79 | typedef struct RL_VLC_ELEM { | ||
80 | int16_t level; | ||
81 | int8_t len; | ||
82 | uint8_t run; | ||
83 | } RL_VLC_ELEM; | ||
84 | |||
85 | /* Bitstream reader API docs: | ||
86 | name | ||
87 | arbitrary name which is used as prefix for the internal variables | ||
88 | |||
89 | gb | ||
90 | getbitcontext | ||
91 | |||
92 | OPEN_READER(name, gb) | ||
93 | loads gb into local variables | ||
94 | |||
95 | CLOSE_READER(name, gb) | ||
96 | stores local vars in gb | ||
97 | |||
98 | UPDATE_CACHE(name, gb) | ||
99 | refills the internal cache from the bitstream | ||
100 | after this call at least MIN_CACHE_BITS will be available, | ||
101 | |||
102 | GET_CACHE(name, gb) | ||
103 | will output the contents of the internal cache, next bit is MSB of 32 or 64 bit (FIXME 64bit) | ||
104 | |||
105 | SHOW_UBITS(name, gb, num) | ||
106 | will return the next num bits | ||
107 | |||
108 | SHOW_SBITS(name, gb, num) | ||
109 | will return the next num bits and do sign extension | ||
110 | |||
111 | SKIP_BITS(name, gb, num) | ||
112 | will skip over the next num bits | ||
113 | note, this is equivalent to SKIP_CACHE; SKIP_COUNTER | ||
114 | |||
115 | SKIP_CACHE(name, gb, num) | ||
116 | will remove the next num bits from the cache (note SKIP_COUNTER MUST be called before UPDATE_CACHE / CLOSE_READER) | ||
117 | |||
118 | SKIP_COUNTER(name, gb, num) | ||
119 | will increment the internal bit counter (see SKIP_CACHE & SKIP_BITS) | ||
120 | |||
121 | LAST_SKIP_CACHE(name, gb, num) | ||
122 | will remove the next num bits from the cache if it is needed for UPDATE_CACHE otherwise it will do nothing | ||
123 | |||
124 | LAST_SKIP_BITS(name, gb, num) | ||
125 | is equivalent to LAST_SKIP_CACHE; SKIP_COUNTER | ||
126 | |||
127 | for examples see get_bits, show_bits, skip_bits, get_vlc | ||
128 | */ | ||
129 | |||
130 | #ifdef ALT_BITSTREAM_READER | ||
131 | # define MIN_CACHE_BITS 25 | ||
132 | |||
133 | # define OPEN_READER(name, gb)\ | ||
134 | unsigned int name##_index= (gb)->index;\ | ||
135 | int name##_cache= 0;\ | ||
136 | |||
137 | # define CLOSE_READER(name, gb)\ | ||
138 | (gb)->index= name##_index;\ | ||
139 | |||
140 | # ifdef ALT_BITSTREAM_READER_LE | ||
141 | # define UPDATE_CACHE(name, gb)\ | ||
142 | name##_cache= AV_RL32( ((const uint8_t *)(gb)->buffer)+(name##_index>>3) ) >> (name##_index&0x07);\ | ||
143 | |||
144 | # define SKIP_CACHE(name, gb, num)\ | ||
145 | name##_cache >>= (num); | ||
146 | # else | ||
147 | # define UPDATE_CACHE(name, gb)\ | ||
148 | name##_cache= AV_RB32( ((const uint8_t *)(gb)->buffer)+(name##_index>>3) ) << (name##_index&0x07);\ | ||
149 | |||
150 | # define SKIP_CACHE(name, gb, num)\ | ||
151 | name##_cache <<= (num); | ||
152 | # endif | ||
153 | |||
154 | // FIXME name? | ||
155 | # define SKIP_COUNTER(name, gb, num)\ | ||
156 | name##_index += (num);\ | ||
157 | |||
158 | # define SKIP_BITS(name, gb, num)\ | ||
159 | {\ | ||
160 | SKIP_CACHE(name, gb, num)\ | ||
161 | SKIP_COUNTER(name, gb, num)\ | ||
162 | }\ | ||
163 | |||
164 | # define LAST_SKIP_BITS(name, gb, num) SKIP_COUNTER(name, gb, num) | ||
165 | # define LAST_SKIP_CACHE(name, gb, num) ; | ||
166 | |||
167 | # ifdef ALT_BITSTREAM_READER_LE | ||
168 | # define SHOW_UBITS(name, gb, num)\ | ||
169 | zero_extend(name##_cache, num) | ||
170 | |||
171 | # define SHOW_SBITS(name, gb, num)\ | ||
172 | sign_extend(name##_cache, num) | ||
173 | # else | ||
174 | # define SHOW_UBITS(name, gb, num)\ | ||
175 | NEG_USR32(name##_cache, num) | ||
176 | |||
177 | # define SHOW_SBITS(name, gb, num)\ | ||
178 | NEG_SSR32(name##_cache, num) | ||
179 | # endif | ||
180 | |||
181 | # define GET_CACHE(name, gb)\ | ||
182 | ((uint32_t)name##_cache) | ||
183 | |||
184 | static inline int get_bits_count(const GetBitContext *s){ | ||
185 | return s->index; | ||
186 | } | ||
187 | |||
188 | static inline void skip_bits_long(GetBitContext *s, int n){ | ||
189 | s->index += n; | ||
190 | } | ||
191 | |||
192 | #elif defined LIBMPEG2_BITSTREAM_READER | ||
193 | //libmpeg2 like reader | ||
194 | |||
195 | # define MIN_CACHE_BITS 17 | ||
196 | |||
197 | # define OPEN_READER(name, gb)\ | ||
198 | int name##_bit_count=(gb)->bit_count;\ | ||
199 | int name##_cache= (gb)->cache;\ | ||
200 | uint8_t * name##_buffer_ptr=(gb)->buffer_ptr;\ | ||
201 | |||
202 | # define CLOSE_READER(name, gb)\ | ||
203 | (gb)->bit_count= name##_bit_count;\ | ||
204 | (gb)->cache= name##_cache;\ | ||
205 | (gb)->buffer_ptr= name##_buffer_ptr;\ | ||
206 | |||
207 | # define UPDATE_CACHE(name, gb)\ | ||
208 | if(name##_bit_count >= 0){\ | ||
209 | name##_cache+= AV_RB16(name##_buffer_ptr) << name##_bit_count; \ | ||
210 | name##_buffer_ptr+=2;\ | ||
211 | name##_bit_count-= 16;\ | ||
212 | }\ | ||
213 | |||
214 | # define SKIP_CACHE(name, gb, num)\ | ||
215 | name##_cache <<= (num);\ | ||
216 | |||
217 | # define SKIP_COUNTER(name, gb, num)\ | ||
218 | name##_bit_count += (num);\ | ||
219 | |||
220 | # define SKIP_BITS(name, gb, num)\ | ||
221 | {\ | ||
222 | SKIP_CACHE(name, gb, num)\ | ||
223 | SKIP_COUNTER(name, gb, num)\ | ||
224 | }\ | ||
225 | |||
226 | # define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num) | ||
227 | # define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num) | ||
228 | |||
229 | # define SHOW_UBITS(name, gb, num)\ | ||
230 | NEG_USR32(name##_cache, num) | ||
231 | |||
232 | # define SHOW_SBITS(name, gb, num)\ | ||
233 | NEG_SSR32(name##_cache, num) | ||
234 | |||
235 | # define GET_CACHE(name, gb)\ | ||
236 | ((uint32_t)name##_cache) | ||
237 | |||
238 | static inline int get_bits_count(const GetBitContext *s){ | ||
239 | return (s->buffer_ptr - s->buffer)*8 - 16 + s->bit_count; | ||
240 | } | ||
241 | |||
242 | static inline void skip_bits_long(GetBitContext *s, int n){ | ||
243 | OPEN_READER(re, s) | ||
244 | re_bit_count += n; | ||
245 | re_buffer_ptr += 2*(re_bit_count>>4); | ||
246 | re_bit_count &= 15; | ||
247 | re_cache = ((re_buffer_ptr[-2]<<8) + re_buffer_ptr[-1]) << (16+re_bit_count); | ||
248 | UPDATE_CACHE(re, s) | ||
249 | CLOSE_READER(re, s) | ||
250 | } | ||
251 | |||
252 | #elif defined A32_BITSTREAM_READER | ||
253 | |||
254 | # define MIN_CACHE_BITS 32 | ||
255 | |||
256 | # define OPEN_READER(name, gb)\ | ||
257 | int name##_bit_count=(gb)->bit_count;\ | ||
258 | uint32_t name##_cache0= (gb)->cache0;\ | ||
259 | uint32_t name##_cache1= (gb)->cache1;\ | ||
260 | uint32_t * name##_buffer_ptr=(gb)->buffer_ptr;\ | ||
261 | |||
262 | # define CLOSE_READER(name, gb)\ | ||
263 | (gb)->bit_count= name##_bit_count;\ | ||
264 | (gb)->cache0= name##_cache0;\ | ||
265 | (gb)->cache1= name##_cache1;\ | ||
266 | (gb)->buffer_ptr= name##_buffer_ptr;\ | ||
267 | |||
268 | # define UPDATE_CACHE(name, gb)\ | ||
269 | if(name##_bit_count > 0){\ | ||
270 | const uint32_t next= av_be2ne32( *name##_buffer_ptr );\ | ||
271 | name##_cache0 |= NEG_USR32(next,name##_bit_count);\ | ||
272 | name##_cache1 |= next<<name##_bit_count;\ | ||
273 | name##_buffer_ptr++;\ | ||
274 | name##_bit_count-= 32;\ | ||
275 | }\ | ||
276 | |||
277 | #if ARCH_X86 | ||
278 | # define SKIP_CACHE(name, gb, num)\ | ||
279 | __asm__(\ | ||
280 | "shldl %2, %1, %0 \n\t"\ | ||
281 | "shll %2, %1 \n\t"\ | ||
282 | : "+r" (name##_cache0), "+r" (name##_cache1)\ | ||
283 | : "Ic" ((uint8_t)(num))\ | ||
284 | ); | ||
285 | #else | ||
286 | # define SKIP_CACHE(name, gb, num)\ | ||
287 | name##_cache0 <<= (num);\ | ||
288 | name##_cache0 |= NEG_USR32(name##_cache1,num);\ | ||
289 | name##_cache1 <<= (num); | ||
290 | #endif | ||
291 | |||
292 | # define SKIP_COUNTER(name, gb, num)\ | ||
293 | name##_bit_count += (num);\ | ||
294 | |||
295 | # define SKIP_BITS(name, gb, num)\ | ||
296 | {\ | ||
297 | SKIP_CACHE(name, gb, num)\ | ||
298 | SKIP_COUNTER(name, gb, num)\ | ||
299 | }\ | ||
300 | |||
301 | # define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num) | ||
302 | # define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num) | ||
303 | |||
304 | # define SHOW_UBITS(name, gb, num)\ | ||
305 | NEG_USR32(name##_cache0, num) | ||
306 | |||
307 | # define SHOW_SBITS(name, gb, num)\ | ||
308 | NEG_SSR32(name##_cache0, num) | ||
309 | |||
310 | # define GET_CACHE(name, gb)\ | ||
311 | (name##_cache0) | ||
312 | |||
313 | static inline int get_bits_count(const GetBitContext *s){ | ||
314 | return ((uint8_t*)s->buffer_ptr - s->buffer)*8 - 32 + s->bit_count; | ||
315 | } | ||
316 | |||
317 | static inline void skip_bits_long(GetBitContext *s, int n){ | ||
318 | OPEN_READER(re, s) | ||
319 | re_bit_count += n; | ||
320 | re_buffer_ptr += re_bit_count>>5; | ||
321 | re_bit_count &= 31; | ||
322 | re_cache0 = av_be2ne32( re_buffer_ptr[-1] ) << re_bit_count; | ||
323 | re_cache1 = 0; | ||
324 | UPDATE_CACHE(re, s) | ||
325 | CLOSE_READER(re, s) | ||
326 | } | ||
327 | |||
328 | #endif | ||
329 | |||
330 | /** | ||
331 | * read mpeg1 dc style vlc (sign bit + mantisse with no MSB). | ||
332 | * if MSB not set it is negative | ||
333 | * @param n length in bits | ||
334 | * @author BERO | ||
335 | */ | ||
336 | static inline int get_xbits(GetBitContext *s, int n){ | ||
337 | register int sign; | ||
338 | register int32_t cache; | ||
339 | OPEN_READER(re, s) | ||
340 | UPDATE_CACHE(re, s) | ||
341 | cache = GET_CACHE(re,s); | ||
342 | sign=(~cache)>>31; | ||
343 | LAST_SKIP_BITS(re, s, n) | ||
344 | CLOSE_READER(re, s) | ||
345 | return (NEG_USR32(sign ^ cache, n) ^ sign) - sign; | ||
346 | } | ||
347 | |||
348 | static inline int get_sbits(GetBitContext *s, int n){ | ||
349 | register int tmp; | ||
350 | OPEN_READER(re, s) | ||
351 | UPDATE_CACHE(re, s) | ||
352 | tmp= SHOW_SBITS(re, s, n); | ||
353 | LAST_SKIP_BITS(re, s, n) | ||
354 | CLOSE_READER(re, s) | ||
355 | return tmp; | ||
356 | } | ||
357 | |||
358 | /** | ||
359 | * reads 1-17 bits. | ||
360 | * Note, the alt bitstream reader can read up to 25 bits, but the libmpeg2 reader can't | ||
361 | */ | ||
362 | static inline unsigned int get_bits(GetBitContext *s, int n){ | ||
363 | register int tmp; | ||
364 | OPEN_READER(re, s) | ||
365 | UPDATE_CACHE(re, s) | ||
366 | tmp= SHOW_UBITS(re, s, n); | ||
367 | LAST_SKIP_BITS(re, s, n) | ||
368 | CLOSE_READER(re, s) | ||
369 | return tmp; | ||
370 | } | ||
371 | |||
372 | /** | ||
373 | * shows 1-17 bits. | ||
374 | * Note, the alt bitstream reader can read up to 25 bits, but the libmpeg2 reader can't | ||
375 | */ | ||
376 | static inline unsigned int show_bits(GetBitContext *s, int n){ | ||
377 | register int tmp; | ||
378 | OPEN_READER(re, s) | ||
379 | UPDATE_CACHE(re, s) | ||
380 | tmp= SHOW_UBITS(re, s, n); | ||
381 | // CLOSE_READER(re, s) | ||
382 | return tmp; | ||
383 | } | ||
384 | |||
385 | static inline void skip_bits(GetBitContext *s, int n){ | ||
386 | //Note gcc seems to optimize this to s->index+=n for the ALT_READER :)) | ||
387 | OPEN_READER(re, s) | ||
388 | UPDATE_CACHE(re, s) | ||
389 | LAST_SKIP_BITS(re, s, n) | ||
390 | CLOSE_READER(re, s) | ||
391 | } | ||
392 | |||
393 | static inline unsigned int get_bits1(GetBitContext *s){ | ||
394 | #ifdef ALT_BITSTREAM_READER | ||
395 | unsigned int index= s->index; | ||
396 | uint8_t result= s->buffer[ index>>3 ]; | ||
397 | #ifdef ALT_BITSTREAM_READER_LE | ||
398 | result>>= (index&0x07); | ||
399 | result&= 1; | ||
400 | #else | ||
401 | result<<= (index&0x07); | ||
402 | result>>= 8 - 1; | ||
403 | #endif | ||
404 | index++; | ||
405 | s->index= index; | ||
406 | |||
407 | return result; | ||
408 | #else | ||
409 | return get_bits(s, 1); | ||
410 | #endif | ||
411 | } | ||
412 | |||
413 | static inline unsigned int show_bits1(GetBitContext *s){ | ||
414 | return show_bits(s, 1); | ||
415 | } | ||
416 | |||
417 | static inline void skip_bits1(GetBitContext *s){ | ||
418 | skip_bits(s, 1); | ||
419 | } | ||
420 | |||
421 | /** | ||
422 | * reads 0-32 bits. | ||
423 | */ | ||
424 | static inline unsigned int get_bits_long(GetBitContext *s, int n){ | ||
425 | if(n<=MIN_CACHE_BITS) return get_bits(s, n); | ||
426 | else{ | ||
427 | #ifdef ALT_BITSTREAM_READER_LE | ||
428 | int ret= get_bits(s, 16); | ||
429 | return ret | (get_bits(s, n-16) << 16); | ||
430 | #else | ||
431 | int ret= get_bits(s, 16) << (n-16); | ||
432 | return ret | get_bits(s, n-16); | ||
433 | #endif | ||
434 | } | ||
435 | } | ||
436 | |||
437 | /** | ||
438 | * reads 0-32 bits as a signed integer. | ||
439 | */ | ||
440 | static inline int get_sbits_long(GetBitContext *s, int n) { | ||
441 | return sign_extend(get_bits_long(s, n), n); | ||
442 | } | ||
443 | |||
444 | /** | ||
445 | * shows 0-32 bits. | ||
446 | */ | ||
447 | static inline unsigned int show_bits_long(GetBitContext *s, int n){ | ||
448 | if(n<=MIN_CACHE_BITS) return show_bits(s, n); | ||
449 | else{ | ||
450 | GetBitContext gb= *s; | ||
451 | return get_bits_long(&gb, n); | ||
452 | } | ||
453 | } | ||
454 | |||
455 | static inline int check_marker(GetBitContext *s, const char *msg) | ||
456 | { | ||
457 | int bit= get_bits1(s); | ||
458 | if(!bit) | ||
459 | av_log(NULL, AV_LOG_INFO, "Marker bit missing %s\n", msg); | ||
460 | |||
461 | return bit; | ||
462 | } | ||
463 | |||
464 | /** | ||
465 | * init GetBitContext. | ||
466 | * @param buffer bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE bytes larger then the actual read bits | ||
467 | * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end | ||
468 | * @param bit_size the size of the buffer in bits | ||
469 | * | ||
470 | * While GetBitContext stores the buffer size, for performance reasons you are | ||
471 | * responsible for checking for the buffer end yourself (take advantage of the padding)! | ||
472 | */ | ||
473 | static inline void init_get_bits(GetBitContext *s, | ||
474 | const uint8_t *buffer, int bit_size) | ||
475 | { | ||
476 | int buffer_size= (bit_size+7)>>3; | ||
477 | if(buffer_size < 0 || bit_size < 0) { | ||
478 | buffer_size = bit_size = 0; | ||
479 | buffer = NULL; | ||
480 | } | ||
481 | |||
482 | s->buffer= buffer; | ||
483 | s->size_in_bits= bit_size; | ||
484 | s->buffer_end= buffer + buffer_size; | ||
485 | #ifdef ALT_BITSTREAM_READER | ||
486 | s->index=0; | ||
487 | #elif defined LIBMPEG2_BITSTREAM_READER | ||
488 | s->buffer_ptr = (uint8_t*)((intptr_t)buffer&(~1)); | ||
489 | s->bit_count = 16 + 8*((intptr_t)buffer&1); | ||
490 | skip_bits_long(s, 0); | ||
491 | #elif defined A32_BITSTREAM_READER | ||
492 | s->buffer_ptr = (uint32_t*)((intptr_t)buffer&(~3)); | ||
493 | s->bit_count = 32 + 8*((intptr_t)buffer&3); | ||
494 | skip_bits_long(s, 0); | ||
495 | #endif | ||
496 | } | ||
497 | |||
498 | static inline void align_get_bits(GetBitContext *s) | ||
499 | { | ||
500 | int n= (-get_bits_count(s)) & 7; | ||
501 | if(n) skip_bits(s, n); | ||
502 | } | ||
503 | |||
504 | #define init_vlc(vlc, nb_bits, nb_codes,\ | ||
505 | bits, bits_wrap, bits_size,\ | ||
506 | codes, codes_wrap, codes_size,\ | ||
507 | flags)\ | ||
508 | init_vlc_sparse(vlc, nb_bits, nb_codes,\ | ||
509 | bits, bits_wrap, bits_size,\ | ||
510 | codes, codes_wrap, codes_size,\ | ||
511 | NULL, 0, 0, flags) | ||
512 | |||
513 | int init_vlc_sparse(VLC *vlc, int nb_bits, int nb_codes, | ||
514 | const void *bits, int bits_wrap, int bits_size, | ||
515 | const void *codes, int codes_wrap, int codes_size, | ||
516 | const void *symbols, int symbols_wrap, int symbols_size, | ||
517 | int flags); | ||
518 | #define INIT_VLC_LE 2 | ||
519 | #define INIT_VLC_USE_NEW_STATIC 4 | ||
520 | void free_vlc(VLC *vlc); | ||
521 | |||
522 | #define INIT_VLC_STATIC(vlc, bits, a,b,c,d,e,f,g, static_size)\ | ||
523 | {\ | ||
524 | static VLC_TYPE table[static_size][2];\ | ||
525 | (vlc)->table= table;\ | ||
526 | (vlc)->table_allocated= static_size;\ | ||
527 | init_vlc(vlc, bits, a,b,c,d,e,f,g, INIT_VLC_USE_NEW_STATIC);\ | ||
528 | } | ||
529 | |||
530 | |||
531 | /** | ||
532 | * | ||
533 | * If the vlc code is invalid and max_depth=1, then no bits will be removed. | ||
534 | * If the vlc code is invalid and max_depth>1, then the number of bits removed | ||
535 | * is undefined. | ||
536 | */ | ||
537 | #define GET_VLC(code, name, gb, table, bits, max_depth)\ | ||
538 | {\ | ||
539 | int n, nb_bits;\ | ||
540 | unsigned int index;\ | ||
541 | \ | ||
542 | index= SHOW_UBITS(name, gb, bits);\ | ||
543 | code = table[index][0];\ | ||
544 | n = table[index][1];\ | ||
545 | \ | ||
546 | if(max_depth > 1 && n < 0){\ | ||
547 | LAST_SKIP_BITS(name, gb, bits)\ | ||
548 | UPDATE_CACHE(name, gb)\ | ||
549 | \ | ||
550 | nb_bits = -n;\ | ||
551 | \ | ||
552 | index= SHOW_UBITS(name, gb, nb_bits) + code;\ | ||
553 | code = table[index][0];\ | ||
554 | n = table[index][1];\ | ||
555 | if(max_depth > 2 && n < 0){\ | ||
556 | LAST_SKIP_BITS(name, gb, nb_bits)\ | ||
557 | UPDATE_CACHE(name, gb)\ | ||
558 | \ | ||
559 | nb_bits = -n;\ | ||
560 | \ | ||
561 | index= SHOW_UBITS(name, gb, nb_bits) + code;\ | ||
562 | code = table[index][0];\ | ||
563 | n = table[index][1];\ | ||
564 | }\ | ||
565 | }\ | ||
566 | SKIP_BITS(name, gb, n)\ | ||
567 | } | ||
568 | |||
569 | #define GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update)\ | ||
570 | {\ | ||
571 | int n, nb_bits;\ | ||
572 | unsigned int index;\ | ||
573 | \ | ||
574 | index= SHOW_UBITS(name, gb, bits);\ | ||
575 | level = table[index].level;\ | ||
576 | n = table[index].len;\ | ||
577 | \ | ||
578 | if(max_depth > 1 && n < 0){\ | ||
579 | SKIP_BITS(name, gb, bits)\ | ||
580 | if(need_update){\ | ||
581 | UPDATE_CACHE(name, gb)\ | ||
582 | }\ | ||
583 | \ | ||
584 | nb_bits = -n;\ | ||
585 | \ | ||
586 | index= SHOW_UBITS(name, gb, nb_bits) + level;\ | ||
587 | level = table[index].level;\ | ||
588 | n = table[index].len;\ | ||
589 | }\ | ||
590 | run= table[index].run;\ | ||
591 | SKIP_BITS(name, gb, n)\ | ||
592 | } | ||
593 | |||
594 | |||
595 | /** | ||
596 | * parses a vlc code, faster then get_vlc() | ||
597 | * @param bits is the number of bits which will be read at once, must be | ||
598 | * identical to nb_bits in init_vlc() | ||
599 | * @param max_depth is the number of times bits bits must be read to completely | ||
600 | * read the longest vlc code | ||
601 | * = (max_vlc_length + bits - 1) / bits | ||
602 | */ | ||
603 | static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE (*table)[2], | ||
604 | int bits, int max_depth) | ||
605 | { | ||
606 | int code; | ||
607 | |||
608 | OPEN_READER(re, s) | ||
609 | UPDATE_CACHE(re, s) | ||
610 | |||
611 | GET_VLC(code, re, s, table, bits, max_depth) | ||
612 | |||
613 | CLOSE_READER(re, s) | ||
614 | return code; | ||
615 | } | ||
616 | |||
617 | //#define TRACE | ||
618 | |||
619 | #ifdef TRACE | ||
620 | static inline void print_bin(int bits, int n){ | ||
621 | int i; | ||
622 | |||
623 | for(i=n-1; i>=0; i--){ | ||
624 | av_log(NULL, AV_LOG_DEBUG, "%d", (bits>>i)&1); | ||
625 | } | ||
626 | for(i=n; i<24; i++) | ||
627 | av_log(NULL, AV_LOG_DEBUG, " "); | ||
628 | } | ||
629 | |||
630 | static inline int get_bits_trace(GetBitContext *s, int n, char *file, const char *func, int line){ | ||
631 | int r= get_bits(s, n); | ||
632 | |||
633 | print_bin(r, n); | ||
634 | av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d bit @%5d in %s %s:%d\n", r, n, r, get_bits_count(s)-n, file, func, line); | ||
635 | return r; | ||
636 | } | ||
637 | static inline int get_vlc_trace(GetBitContext *s, VLC_TYPE (*table)[2], int bits, int max_depth, char *file, const char *func, int line){ | ||
638 | int show= show_bits(s, 24); | ||
639 | int pos= get_bits_count(s); | ||
640 | int r= get_vlc2(s, table, bits, max_depth); | ||
641 | int len= get_bits_count(s) - pos; | ||
642 | int bits2= show>>(24-len); | ||
643 | |||
644 | print_bin(bits2, len); | ||
645 | |||
646 | av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d vlc @%5d in %s %s:%d\n", bits2, len, r, pos, file, func, line); | ||
647 | return r; | ||
648 | } | ||
649 | static inline int get_xbits_trace(GetBitContext *s, int n, char *file, const char *func, int line){ | ||
650 | int show= show_bits(s, n); | ||
651 | int r= get_xbits(s, n); | ||
652 | |||
653 | print_bin(show, n); | ||
654 | av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d xbt @%5d in %s %s:%d\n", show, n, r, get_bits_count(s)-n, file, func, line); | ||
655 | return r; | ||
656 | } | ||
657 | |||
658 | #define get_bits(s, n) get_bits_trace(s, n, __FILE__, __PRETTY_FUNCTION__, __LINE__) | ||
659 | #define get_bits1(s) get_bits_trace(s, 1, __FILE__, __PRETTY_FUNCTION__, __LINE__) | ||
660 | #define get_xbits(s, n) get_xbits_trace(s, n, __FILE__, __PRETTY_FUNCTION__, __LINE__) | ||
661 | #define get_vlc(s, vlc) get_vlc_trace(s, (vlc)->table, (vlc)->bits, 3, __FILE__, __PRETTY_FUNCTION__, __LINE__) | ||
662 | #define get_vlc2(s, tab, bits, max) get_vlc_trace(s, tab, bits, max, __FILE__, __PRETTY_FUNCTION__, __LINE__) | ||
663 | |||
664 | #define tprintf(p, ...) av_log(p, AV_LOG_DEBUG, __VA_ARGS__) | ||
665 | |||
666 | #else //TRACE | ||
667 | #define tprintf(p, ...) {} | ||
668 | #endif | ||
669 | |||
670 | static inline int decode012(GetBitContext *gb){ | ||
671 | int n; | ||
672 | n = get_bits1(gb); | ||
673 | if (n == 0) | ||
674 | return 0; | ||
675 | else | ||
676 | return get_bits1(gb) + 1; | ||
677 | } | ||
678 | |||
679 | static inline int decode210(GetBitContext *gb){ | ||
680 | if (get_bits1(gb)) | ||
681 | return 0; | ||
682 | else | ||
683 | return 2 - get_bits1(gb); | ||
684 | } | ||
685 | |||
686 | static inline int get_bits_left(GetBitContext *gb) | ||
687 | { | ||
688 | return gb->size_in_bits - get_bits_count(gb); | ||
689 | } | ||
690 | |||
691 | #endif /* AVCODEC_GET_BITS_H */ | ||