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 */ 54typedef 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 73typedef struct VLC { 74 int bits; 75 VLC_TYPE (*table)[2]; ///< code, bits 76 int table_size, table_allocated; 77} VLC; 78 79typedef 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: 86name 87 arbitrary name which is used as prefix for the internal variables 88 89gb 90 getbitcontext 91 92OPEN_READER(name, gb) 93 loads gb into local variables 94 95CLOSE_READER(name, gb) 96 stores local vars in gb 97 98UPDATE_CACHE(name, gb) 99 refills the internal cache from the bitstream 100 after this call at least MIN_CACHE_BITS will be available, 101 102GET_CACHE(name, gb) 103 will output the contents of the internal cache, next bit is MSB of 32 or 64 bit (FIXME 64bit) 104 105SHOW_UBITS(name, gb, num) 106 will return the next num bits 107 108SHOW_SBITS(name, gb, num) 109 will return the next num bits and do sign extension 110 111SKIP_BITS(name, gb, num) 112 will skip over the next num bits 113 note, this is equivalent to SKIP_CACHE; SKIP_COUNTER 114 115SKIP_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 118SKIP_COUNTER(name, gb, num) 119 will increment the internal bit counter (see SKIP_CACHE & SKIP_BITS) 120 121LAST_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 124LAST_SKIP_BITS(name, gb, num) 125 is equivalent to LAST_SKIP_CACHE; SKIP_COUNTER 126 127for 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 184static inline int get_bits_count(const GetBitContext *s){ 185 return s->index; 186} 187 188static 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 238static inline int get_bits_count(const GetBitContext *s){ 239 return (s->buffer_ptr - s->buffer)*8 - 16 + s->bit_count; 240} 241 242static 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= be2me_32( *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 313static inline int get_bits_count(const GetBitContext *s){ 314 return ((uint8_t*)s->buffer_ptr - s->buffer)*8 - 32 + s->bit_count; 315} 316 317static 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 = be2me_32( 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 */ 336static 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 348static 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 */ 362static 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 */ 376static 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 385static 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 393static 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 413static inline unsigned int show_bits1(GetBitContext *s){ 414 return show_bits(s, 1); 415} 416 417static inline void skip_bits1(GetBitContext *s){ 418 skip_bits(s, 1); 419} 420 421/** 422 * reads 0-32 bits. 423 */ 424static 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 */ 440static 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 */ 447static 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 455static 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 */ 473static 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 498static 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 513int 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 520void 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 */ 603static 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 620static 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 630static 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} 637static 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} 649static 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 670static 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 679static inline int decode210(GetBitContext *gb){ 680 if (get_bits1(gb)) 681 return 0; 682 else 683 return 2 - get_bits1(gb); 684} 685 686static 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 */ 692