2 * copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of FFmpeg.
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.
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.
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
22 * @file libavcodec/bitstream.h
23 * bitstream api header.
26 #ifndef AVCODEC_BITSTREAM_H
27 #define AVCODEC_BITSTREAM_H
32 #include "libavutil/bswap.h"
33 #include "libavutil/common.h"
34 #include "libavutil/intreadwrite.h"
35 #include "libavutil/log.h"
38 #if defined(ALT_BITSTREAM_READER_LE) && !defined(ALT_BITSTREAM_READER)
39 # define ALT_BITSTREAM_READER
42 //#define ALT_BITSTREAM_WRITER
43 //#define ALIGNED_BITSTREAM_WRITER
44 #if !defined(LIBMPEG2_BITSTREAM_READER) && !defined(A32_BITSTREAM_READER) && !defined(ALT_BITSTREAM_READER)
46 # define A32_BITSTREAM_READER
48 # define ALT_BITSTREAM_READER
49 //#define LIBMPEG2_BITSTREAM_READER
50 //#define A32_BITSTREAM_READER
54 extern const uint8_t ff_reverse[256];
57 // avoid +32 for shift optimization (gcc should do that ...)
58 static inline int32_t NEG_SSR32( int32_t a, int8_t s){
59 __asm__ ("sarl %1, %0\n\t"
61 : "ic" ((uint8_t)(-s))
65 static inline uint32_t NEG_USR32(uint32_t a, int8_t s){
66 __asm__ ("shrl %1, %0\n\t"
68 : "ic" ((uint8_t)(-s))
73 # define NEG_SSR32(a,s) ((( int32_t)(a))>>(32-(s)))
74 # define NEG_USR32(a,s) (((uint32_t)(a))>>(32-(s)))
79 /* buf and buf_end must be present and used by every alternative writer. */
80 typedef struct PutBitContext {
81 #ifdef ALT_BITSTREAM_WRITER
82 uint8_t *buf, *buf_end;
87 uint8_t *buf, *buf_ptr, *buf_end;
93 * Initializes the PutBitContext \p s.
95 * @param buffer the buffer where to put bits
96 * @param buffer_size the size in bytes of \p buffer
98 static inline void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
100 if(buffer_size < 0) {
105 s->size_in_bits= 8*buffer_size;
107 s->buf_end = s->buf + buffer_size;
108 #ifdef ALT_BITSTREAM_WRITER
110 ((uint32_t*)(s->buf))[0]=0;
111 // memset(buffer, 0, buffer_size);
120 * Returns the number of bits output.
122 static inline int put_bits_count(PutBitContext *s)
124 #ifdef ALT_BITSTREAM_WRITER
127 return (s->buf_ptr - s->buf) * 8 + 32 - s->bit_left;
132 * Pads the end of the output stream with zeros.
134 static inline void flush_put_bits(PutBitContext *s)
136 #ifdef ALT_BITSTREAM_WRITER
139 #ifndef BITSTREAM_WRITER_LE
140 s->bit_buf<<= s->bit_left;
142 while (s->bit_left < 32) {
143 /* XXX: should test end of buffer */
144 #ifdef BITSTREAM_WRITER_LE
145 *s->buf_ptr++=s->bit_buf;
148 *s->buf_ptr++=s->bit_buf >> 24;
159 * Pads the bitstream with zeros up to the next byte boundary.
161 void align_put_bits(PutBitContext *s);
162 void ff_put_string(PutBitContext * pbc, const char *s, int put_zero);
163 void ff_copy_bits(PutBitContext *pb, const uint8_t *src, int length);
166 /* buffer, buffer_end and size_in_bits must be present and used by every reader */
167 typedef struct GetBitContext {
168 const uint8_t *buffer, *buffer_end;
169 #ifdef ALT_BITSTREAM_READER
171 #elif defined LIBMPEG2_BITSTREAM_READER
175 #elif defined A32_BITSTREAM_READER
176 uint32_t *buffer_ptr;
184 #define VLC_TYPE int16_t
188 VLC_TYPE (*table)[2]; ///< code, bits
189 int table_size, table_allocated;
192 typedef struct RL_VLC_ELEM {
198 #ifndef ALT_BITSTREAM_WRITER
199 static inline void put_bits(PutBitContext *s, int n, unsigned int value)
201 unsigned int bit_buf;
204 // printf("put_bits=%d %x\n", n, value);
205 assert(n == 32 || value < (1U << n));
207 bit_buf = s->bit_buf;
208 bit_left = s->bit_left;
210 // printf("n=%d value=%x cnt=%d buf=%x\n", n, value, bit_cnt, bit_buf);
212 #ifdef BITSTREAM_WRITER_LE
213 bit_buf |= value << (32 - bit_left);
215 #if !HAVE_FAST_UNALIGNED
216 if (3 & (intptr_t) s->buf_ptr) {
217 AV_WL32(s->buf_ptr, bit_buf);
220 *(uint32_t *)s->buf_ptr = le2me_32(bit_buf);
222 bit_buf = (bit_left==32)?0:value >> bit_left;
228 bit_buf = (bit_buf<<n) | value;
232 bit_buf |= value >> (n - bit_left);
233 #if !HAVE_FAST_UNALIGNED
234 if (3 & (intptr_t) s->buf_ptr) {
235 AV_WB32(s->buf_ptr, bit_buf);
238 *(uint32_t *)s->buf_ptr = be2me_32(bit_buf);
239 //printf("bitbuf = %08x\n", bit_buf);
246 s->bit_buf = bit_buf;
247 s->bit_left = bit_left;
252 #ifdef ALT_BITSTREAM_WRITER
253 static inline void put_bits(PutBitContext *s, int n, unsigned int value)
255 # ifdef ALIGNED_BITSTREAM_WRITER
258 "movl %0, %%ecx \n\t"
259 "xorl %%eax, %%eax \n\t"
260 "shrdl %%cl, %1, %%eax \n\t"
262 "movl %0, %%ecx \n\t"
263 "shrl $3, %%ecx \n\t"
264 "andl $0xFFFFFFFC, %%ecx \n\t"
266 "orl %1, (%2, %%ecx) \n\t"
269 "movl %%eax, 4(%2, %%ecx) \n\t"
270 : "=&r" (s->index), "=&r" (value)
271 : "r" (s->buf), "r" (n), "0" (s->index), "1" (value<<(-n))
276 uint32_t *ptr= ((uint32_t *)s->buf)+(index>>5);
280 ptr[0] |= be2me_32(value>>(index&31));
281 ptr[1] = be2me_32(value<<(32-(index&31)));
282 //if(n>24) printf("%d %d\n", n, value);
286 # else //ALIGNED_BITSTREAM_WRITER
289 "movl $7, %%ecx \n\t"
290 "andl %0, %%ecx \n\t"
291 "addl %3, %%ecx \n\t"
295 "movl %0, %%ecx \n\t"
296 "shrl $3, %%ecx \n\t"
297 "orl %1, (%%ecx, %2) \n\t"
299 "movl $0, 4(%%ecx, %2) \n\t"
300 : "=&r" (s->index), "=&r" (value)
301 : "r" (s->buf), "r" (n), "0" (s->index), "1" (value)
306 uint32_t *ptr= (uint32_t*)(((uint8_t *)s->buf)+(index>>3));
308 ptr[0] |= be2me_32(value<<(32-n-(index&7) ));
310 //if(n>24) printf("%d %d\n", n, value);
314 # endif //!ALIGNED_BITSTREAM_WRITER
318 static inline void put_sbits(PutBitContext *pb, int bits, int32_t val)
320 assert(bits >= 0 && bits <= 31);
322 put_bits(pb, bits, val & ((1<<bits)-1));
326 static inline uint8_t* pbBufPtr(PutBitContext *s)
328 #ifdef ALT_BITSTREAM_WRITER
329 return s->buf + (s->index>>3);
337 * PutBitContext must be flushed & aligned to a byte boundary before calling this.
339 static inline void skip_put_bytes(PutBitContext *s, int n){
340 assert((put_bits_count(s)&7)==0);
341 #ifdef ALT_BITSTREAM_WRITER
342 FIXME may need some cleaning of the buffer
345 assert(s->bit_left==32);
351 * Skips the given number of bits.
352 * Must only be used if the actual values in the bitstream do not matter.
353 * If \p n is 0 the behavior is undefined.
355 static inline void skip_put_bits(PutBitContext *s, int n){
356 #ifdef ALT_BITSTREAM_WRITER
360 s->buf_ptr-= s->bit_left>>5;
366 * Changes the end of the buffer.
368 static inline void set_put_bits_buffer_size(PutBitContext *s, int size){
369 s->buf_end= s->buf + size;
372 /* Bitstream reader API docs:
374 arbitrary name which is used as prefix for the internal variables
379 OPEN_READER(name, gb)
380 loads gb into local variables
382 CLOSE_READER(name, gb)
383 stores local vars in gb
385 UPDATE_CACHE(name, gb)
386 refills the internal cache from the bitstream
387 after this call at least MIN_CACHE_BITS will be available,
390 will output the contents of the internal cache, next bit is MSB of 32 or 64 bit (FIXME 64bit)
392 SHOW_UBITS(name, gb, num)
393 will return the next num bits
395 SHOW_SBITS(name, gb, num)
396 will return the next num bits and do sign extension
398 SKIP_BITS(name, gb, num)
399 will skip over the next num bits
400 note, this is equivalent to SKIP_CACHE; SKIP_COUNTER
402 SKIP_CACHE(name, gb, num)
403 will remove the next num bits from the cache (note SKIP_COUNTER MUST be called before UPDATE_CACHE / CLOSE_READER)
405 SKIP_COUNTER(name, gb, num)
406 will increment the internal bit counter (see SKIP_CACHE & SKIP_BITS)
408 LAST_SKIP_CACHE(name, gb, num)
409 will remove the next num bits from the cache if it is needed for UPDATE_CACHE otherwise it will do nothing
411 LAST_SKIP_BITS(name, gb, num)
412 is equivalent to SKIP_LAST_CACHE; SKIP_COUNTER
414 for examples see get_bits, show_bits, skip_bits, get_vlc
417 #ifdef ALT_BITSTREAM_READER
418 # define MIN_CACHE_BITS 25
420 # define OPEN_READER(name, gb)\
421 int name##_index= (gb)->index;\
422 int name##_cache= 0;\
424 # define CLOSE_READER(name, gb)\
425 (gb)->index= name##_index;\
427 # ifdef ALT_BITSTREAM_READER_LE
428 # define UPDATE_CACHE(name, gb)\
429 name##_cache= AV_RL32( ((const uint8_t *)(gb)->buffer)+(name##_index>>3) ) >> (name##_index&0x07);\
431 # define SKIP_CACHE(name, gb, num)\
432 name##_cache >>= (num);
434 # define UPDATE_CACHE(name, gb)\
435 name##_cache= AV_RB32( ((const uint8_t *)(gb)->buffer)+(name##_index>>3) ) << (name##_index&0x07);\
437 # define SKIP_CACHE(name, gb, num)\
438 name##_cache <<= (num);
442 # define SKIP_COUNTER(name, gb, num)\
443 name##_index += (num);\
445 # define SKIP_BITS(name, gb, num)\
447 SKIP_CACHE(name, gb, num)\
448 SKIP_COUNTER(name, gb, num)\
451 # define LAST_SKIP_BITS(name, gb, num) SKIP_COUNTER(name, gb, num)
452 # define LAST_SKIP_CACHE(name, gb, num) ;
454 # ifdef ALT_BITSTREAM_READER_LE
455 # define SHOW_UBITS(name, gb, num)\
456 ((name##_cache) & (NEG_USR32(0xffffffff,num)))
458 # define SHOW_SBITS(name, gb, num)\
459 NEG_SSR32((name##_cache)<<(32-(num)), num)
461 # define SHOW_UBITS(name, gb, num)\
462 NEG_USR32(name##_cache, num)
464 # define SHOW_SBITS(name, gb, num)\
465 NEG_SSR32(name##_cache, num)
468 # define GET_CACHE(name, gb)\
469 ((uint32_t)name##_cache)
471 static inline int get_bits_count(GetBitContext *s){
475 static inline void skip_bits_long(GetBitContext *s, int n){
479 #elif defined LIBMPEG2_BITSTREAM_READER
480 //libmpeg2 like reader
482 # define MIN_CACHE_BITS 17
484 # define OPEN_READER(name, gb)\
485 int name##_bit_count=(gb)->bit_count;\
486 int name##_cache= (gb)->cache;\
487 uint8_t * name##_buffer_ptr=(gb)->buffer_ptr;\
489 # define CLOSE_READER(name, gb)\
490 (gb)->bit_count= name##_bit_count;\
491 (gb)->cache= name##_cache;\
492 (gb)->buffer_ptr= name##_buffer_ptr;\
494 # define UPDATE_CACHE(name, gb)\
495 if(name##_bit_count >= 0){\
496 name##_cache+= AV_RB16(name##_buffer_ptr) << name##_bit_count; \
497 name##_buffer_ptr+=2;\
498 name##_bit_count-= 16;\
501 # define SKIP_CACHE(name, gb, num)\
502 name##_cache <<= (num);\
504 # define SKIP_COUNTER(name, gb, num)\
505 name##_bit_count += (num);\
507 # define SKIP_BITS(name, gb, num)\
509 SKIP_CACHE(name, gb, num)\
510 SKIP_COUNTER(name, gb, num)\
513 # define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num)
514 # define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num)
516 # define SHOW_UBITS(name, gb, num)\
517 NEG_USR32(name##_cache, num)
519 # define SHOW_SBITS(name, gb, num)\
520 NEG_SSR32(name##_cache, num)
522 # define GET_CACHE(name, gb)\
523 ((uint32_t)name##_cache)
525 static inline int get_bits_count(GetBitContext *s){
526 return (s->buffer_ptr - s->buffer)*8 - 16 + s->bit_count;
529 static inline void skip_bits_long(GetBitContext *s, int n){
532 re_buffer_ptr += 2*(re_bit_count>>4);
534 re_cache = ((re_buffer_ptr[-2]<<8) + re_buffer_ptr[-1]) << (16+re_bit_count);
539 #elif defined A32_BITSTREAM_READER
541 # define MIN_CACHE_BITS 32
543 # define OPEN_READER(name, gb)\
544 int name##_bit_count=(gb)->bit_count;\
545 uint32_t name##_cache0= (gb)->cache0;\
546 uint32_t name##_cache1= (gb)->cache1;\
547 uint32_t * name##_buffer_ptr=(gb)->buffer_ptr;\
549 # define CLOSE_READER(name, gb)\
550 (gb)->bit_count= name##_bit_count;\
551 (gb)->cache0= name##_cache0;\
552 (gb)->cache1= name##_cache1;\
553 (gb)->buffer_ptr= name##_buffer_ptr;\
555 # define UPDATE_CACHE(name, gb)\
556 if(name##_bit_count > 0){\
557 const uint32_t next= be2me_32( *name##_buffer_ptr );\
558 name##_cache0 |= NEG_USR32(next,name##_bit_count);\
559 name##_cache1 |= next<<name##_bit_count;\
560 name##_buffer_ptr++;\
561 name##_bit_count-= 32;\
565 # define SKIP_CACHE(name, gb, num)\
567 "shldl %2, %1, %0 \n\t"\
569 : "+r" (name##_cache0), "+r" (name##_cache1)\
570 : "Ic" ((uint8_t)(num))\
573 # define SKIP_CACHE(name, gb, num)\
574 name##_cache0 <<= (num);\
575 name##_cache0 |= NEG_USR32(name##_cache1,num);\
576 name##_cache1 <<= (num);
579 # define SKIP_COUNTER(name, gb, num)\
580 name##_bit_count += (num);\
582 # define SKIP_BITS(name, gb, num)\
584 SKIP_CACHE(name, gb, num)\
585 SKIP_COUNTER(name, gb, num)\
588 # define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num)
589 # define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num)
591 # define SHOW_UBITS(name, gb, num)\
592 NEG_USR32(name##_cache0, num)
594 # define SHOW_SBITS(name, gb, num)\
595 NEG_SSR32(name##_cache0, num)
597 # define GET_CACHE(name, gb)\
600 static inline int get_bits_count(GetBitContext *s){
601 return ((uint8_t*)s->buffer_ptr - s->buffer)*8 - 32 + s->bit_count;
604 static inline void skip_bits_long(GetBitContext *s, int n){
607 re_buffer_ptr += re_bit_count>>5;
609 re_cache0 = be2me_32( re_buffer_ptr[-1] ) << re_bit_count;
618 * read mpeg1 dc style vlc (sign bit + mantisse with no MSB).
619 * if MSB not set it is negative
620 * @param n length in bits
623 static inline int get_xbits(GetBitContext *s, int n){
625 register int32_t cache;
628 cache = GET_CACHE(re,s);
630 LAST_SKIP_BITS(re, s, n)
632 return (NEG_USR32(sign ^ cache, n) ^ sign) - sign;
635 static inline int get_sbits(GetBitContext *s, int n){
639 tmp= SHOW_SBITS(re, s, n);
640 LAST_SKIP_BITS(re, s, n)
647 * Note, the alt bitstream reader can read up to 25 bits, but the libmpeg2 reader can't
649 static inline unsigned int get_bits(GetBitContext *s, int n){
653 tmp= SHOW_UBITS(re, s, n);
654 LAST_SKIP_BITS(re, s, n)
661 * Note, the alt bitstream reader can read up to 25 bits, but the libmpeg2 reader can't
663 static inline unsigned int show_bits(GetBitContext *s, int n){
667 tmp= SHOW_UBITS(re, s, n);
668 // CLOSE_READER(re, s)
672 static inline void skip_bits(GetBitContext *s, int n){
673 //Note gcc seems to optimize this to s->index+=n for the ALT_READER :))
676 LAST_SKIP_BITS(re, s, n)
680 static inline unsigned int get_bits1(GetBitContext *s){
681 #ifdef ALT_BITSTREAM_READER
683 uint8_t result= s->buffer[ index>>3 ];
684 #ifdef ALT_BITSTREAM_READER_LE
685 result>>= (index&0x07);
688 result<<= (index&0x07);
696 return get_bits(s, 1);
700 static inline unsigned int show_bits1(GetBitContext *s){
701 return show_bits(s, 1);
704 static inline void skip_bits1(GetBitContext *s){
711 static inline unsigned int get_bits_long(GetBitContext *s, int n){
712 if(n<=17) return get_bits(s, n);
714 #ifdef ALT_BITSTREAM_READER_LE
715 int ret= get_bits(s, 16);
716 return ret | (get_bits(s, n-16) << 16);
718 int ret= get_bits(s, 16) << (n-16);
719 return ret | get_bits(s, n-16);
725 * reads 0-32 bits as a signed integer.
727 static inline int get_sbits_long(GetBitContext *s, int n) {
728 return sign_extend(get_bits_long(s, n), n);
734 static inline unsigned int show_bits_long(GetBitContext *s, int n){
735 if(n<=17) return show_bits(s, n);
737 GetBitContext gb= *s;
738 return get_bits_long(&gb, n);
742 static inline int check_marker(GetBitContext *s, const char *msg)
744 int bit= get_bits1(s);
746 av_log(NULL, AV_LOG_INFO, "Marker bit missing %s\n", msg);
752 * init GetBitContext.
753 * @param buffer bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE bytes larger then the actual read bits
754 * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
755 * @param bit_size the size of the buffer in bits
757 static inline void init_get_bits(GetBitContext *s,
758 const uint8_t *buffer, int bit_size)
760 int buffer_size= (bit_size+7)>>3;
761 if(buffer_size < 0 || bit_size < 0) {
762 buffer_size = bit_size = 0;
767 s->size_in_bits= bit_size;
768 s->buffer_end= buffer + buffer_size;
769 #ifdef ALT_BITSTREAM_READER
771 #elif defined LIBMPEG2_BITSTREAM_READER
772 s->buffer_ptr = (uint8_t*)((intptr_t)buffer&(~1));
773 s->bit_count = 16 + 8*((intptr_t)buffer&1);
774 skip_bits_long(s, 0);
775 #elif defined A32_BITSTREAM_READER
776 s->buffer_ptr = (uint32_t*)((intptr_t)buffer&(~3));
777 s->bit_count = 32 + 8*((intptr_t)buffer&3);
778 skip_bits_long(s, 0);
782 static inline void align_get_bits(GetBitContext *s)
784 int n= (-get_bits_count(s)) & 7;
785 if(n) skip_bits(s, n);
788 #define init_vlc(vlc, nb_bits, nb_codes,\
789 bits, bits_wrap, bits_size,\
790 codes, codes_wrap, codes_size,\
792 init_vlc_sparse(vlc, nb_bits, nb_codes,\
793 bits, bits_wrap, bits_size,\
794 codes, codes_wrap, codes_size,\
797 int init_vlc_sparse(VLC *vlc, int nb_bits, int nb_codes,
798 const void *bits, int bits_wrap, int bits_size,
799 const void *codes, int codes_wrap, int codes_size,
800 const void *symbols, int symbols_wrap, int symbols_size,
802 #define INIT_VLC_USE_STATIC 1 ///< VERY strongly deprecated and forbidden
803 #define INIT_VLC_LE 2
804 #define INIT_VLC_USE_NEW_STATIC 4
805 void free_vlc(VLC *vlc);
807 #define INIT_VLC_STATIC(vlc, bits, a,b,c,d,e,f,g, static_size)\
809 static VLC_TYPE table[static_size][2];\
810 (vlc)->table= table;\
811 (vlc)->table_allocated= static_size;\
812 init_vlc(vlc, bits, a,b,c,d,e,f,g, INIT_VLC_USE_NEW_STATIC);\
818 * if the vlc code is invalid and max_depth=1 than no bits will be removed
819 * if the vlc code is invalid and max_depth>1 than the number of bits removed
822 #define GET_VLC(code, name, gb, table, bits, max_depth)\
824 int n, index, nb_bits;\
826 index= SHOW_UBITS(name, gb, bits);\
827 code = table[index][0];\
828 n = table[index][1];\
830 if(max_depth > 1 && n < 0){\
831 LAST_SKIP_BITS(name, gb, bits)\
832 UPDATE_CACHE(name, gb)\
836 index= SHOW_UBITS(name, gb, nb_bits) + code;\
837 code = table[index][0];\
838 n = table[index][1];\
839 if(max_depth > 2 && n < 0){\
840 LAST_SKIP_BITS(name, gb, nb_bits)\
841 UPDATE_CACHE(name, gb)\
845 index= SHOW_UBITS(name, gb, nb_bits) + code;\
846 code = table[index][0];\
847 n = table[index][1];\
850 SKIP_BITS(name, gb, n)\
853 #define GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update)\
855 int n, index, nb_bits;\
857 index= SHOW_UBITS(name, gb, bits);\
858 level = table[index].level;\
859 n = table[index].len;\
861 if(max_depth > 1 && n < 0){\
862 SKIP_BITS(name, gb, bits)\
864 UPDATE_CACHE(name, gb)\
869 index= SHOW_UBITS(name, gb, nb_bits) + level;\
870 level = table[index].level;\
871 n = table[index].len;\
873 run= table[index].run;\
874 SKIP_BITS(name, gb, n)\
879 * parses a vlc code, faster then get_vlc()
880 * @param bits is the number of bits which will be read at once, must be
881 * identical to nb_bits in init_vlc()
882 * @param max_depth is the number of times bits bits must be read to completely
883 * read the longest vlc code
884 * = (max_vlc_length + bits - 1) / bits
886 static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE (*table)[2],
887 int bits, int max_depth)
894 GET_VLC(code, re, s, table, bits, max_depth)
903 static inline void print_bin(int bits, int n){
906 for(i=n-1; i>=0; i--){
907 av_log(NULL, AV_LOG_DEBUG, "%d", (bits>>i)&1);
910 av_log(NULL, AV_LOG_DEBUG, " ");
913 static inline int get_bits_trace(GetBitContext *s, int n, char *file, const char *func, int line){
914 int r= get_bits(s, n);
917 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);
920 static inline int get_vlc_trace(GetBitContext *s, VLC_TYPE (*table)[2], int bits, int max_depth, char *file, const char *func, int line){
921 int show= show_bits(s, 24);
922 int pos= get_bits_count(s);
923 int r= get_vlc2(s, table, bits, max_depth);
924 int len= get_bits_count(s) - pos;
925 int bits2= show>>(24-len);
927 print_bin(bits2, len);
929 av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d vlc @%5d in %s %s:%d\n", bits2, len, r, pos, file, func, line);
932 static inline int get_xbits_trace(GetBitContext *s, int n, char *file, const char *func, int line){
933 int show= show_bits(s, n);
934 int r= get_xbits(s, n);
937 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);
941 #define get_bits(s, n) get_bits_trace(s, n, __FILE__, __PRETTY_FUNCTION__, __LINE__)
942 #define get_bits1(s) get_bits_trace(s, 1, __FILE__, __PRETTY_FUNCTION__, __LINE__)
943 #define get_xbits(s, n) get_xbits_trace(s, n, __FILE__, __PRETTY_FUNCTION__, __LINE__)
944 #define get_vlc(s, vlc) get_vlc_trace(s, (vlc)->table, (vlc)->bits, 3, __FILE__, __PRETTY_FUNCTION__, __LINE__)
945 #define get_vlc2(s, tab, bits, max) get_vlc_trace(s, tab, bits, max, __FILE__, __PRETTY_FUNCTION__, __LINE__)
947 #define tprintf(p, ...) av_log(p, AV_LOG_DEBUG, __VA_ARGS__)
950 #define tprintf(p, ...) {}
953 static inline int decode012(GetBitContext *gb){
959 return get_bits1(gb) + 1;
962 static inline int decode210(GetBitContext *gb){
966 return 2 - get_bits1(gb);
969 #endif /* AVCODEC_BITSTREAM_H */