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;
131 /* pad the end of the output stream with zeros */
132 static inline void flush_put_bits(PutBitContext *s)
134 #ifdef ALT_BITSTREAM_WRITER
137 #ifndef BITSTREAM_WRITER_LE
138 s->bit_buf<<= s->bit_left;
140 while (s->bit_left < 32) {
141 /* XXX: should test end of buffer */
142 #ifdef BITSTREAM_WRITER_LE
143 *s->buf_ptr++=s->bit_buf;
146 *s->buf_ptr++=s->bit_buf >> 24;
156 void align_put_bits(PutBitContext *s);
157 void ff_put_string(PutBitContext * pbc, const char *s, int put_zero);
158 void ff_copy_bits(PutBitContext *pb, const uint8_t *src, int length);
161 /* buffer, buffer_end and size_in_bits must be present and used by every reader */
162 typedef struct GetBitContext {
163 const uint8_t *buffer, *buffer_end;
164 #ifdef ALT_BITSTREAM_READER
166 #elif defined LIBMPEG2_BITSTREAM_READER
170 #elif defined A32_BITSTREAM_READER
171 uint32_t *buffer_ptr;
179 #define VLC_TYPE int16_t
183 VLC_TYPE (*table)[2]; ///< code, bits
184 int table_size, table_allocated;
187 typedef struct RL_VLC_ELEM {
193 #ifndef ALT_BITSTREAM_WRITER
194 static inline void put_bits(PutBitContext *s, int n, unsigned int value)
196 unsigned int bit_buf;
199 // printf("put_bits=%d %x\n", n, value);
200 assert(n == 32 || value < (1U << n));
202 bit_buf = s->bit_buf;
203 bit_left = s->bit_left;
205 // printf("n=%d value=%x cnt=%d buf=%x\n", n, value, bit_cnt, bit_buf);
207 #ifdef BITSTREAM_WRITER_LE
208 bit_buf |= value << (32 - bit_left);
210 #if !HAVE_FAST_UNALIGNED
211 if (3 & (intptr_t) s->buf_ptr) {
212 AV_WL32(s->buf_ptr, bit_buf);
215 *(uint32_t *)s->buf_ptr = le2me_32(bit_buf);
217 bit_buf = (bit_left==32)?0:value >> bit_left;
223 bit_buf = (bit_buf<<n) | value;
227 bit_buf |= value >> (n - bit_left);
228 #if !HAVE_FAST_UNALIGNED
229 if (3 & (intptr_t) s->buf_ptr) {
230 AV_WB32(s->buf_ptr, bit_buf);
233 *(uint32_t *)s->buf_ptr = be2me_32(bit_buf);
234 //printf("bitbuf = %08x\n", bit_buf);
241 s->bit_buf = bit_buf;
242 s->bit_left = bit_left;
247 #ifdef ALT_BITSTREAM_WRITER
248 static inline void put_bits(PutBitContext *s, int n, unsigned int value)
250 # ifdef ALIGNED_BITSTREAM_WRITER
253 "movl %0, %%ecx \n\t"
254 "xorl %%eax, %%eax \n\t"
255 "shrdl %%cl, %1, %%eax \n\t"
257 "movl %0, %%ecx \n\t"
258 "shrl $3, %%ecx \n\t"
259 "andl $0xFFFFFFFC, %%ecx \n\t"
261 "orl %1, (%2, %%ecx) \n\t"
264 "movl %%eax, 4(%2, %%ecx) \n\t"
265 : "=&r" (s->index), "=&r" (value)
266 : "r" (s->buf), "r" (n), "0" (s->index), "1" (value<<(-n))
271 uint32_t *ptr= ((uint32_t *)s->buf)+(index>>5);
275 ptr[0] |= be2me_32(value>>(index&31));
276 ptr[1] = be2me_32(value<<(32-(index&31)));
277 //if(n>24) printf("%d %d\n", n, value);
281 # else //ALIGNED_BITSTREAM_WRITER
284 "movl $7, %%ecx \n\t"
285 "andl %0, %%ecx \n\t"
286 "addl %3, %%ecx \n\t"
290 "movl %0, %%ecx \n\t"
291 "shrl $3, %%ecx \n\t"
292 "orl %1, (%%ecx, %2) \n\t"
294 "movl $0, 4(%%ecx, %2) \n\t"
295 : "=&r" (s->index), "=&r" (value)
296 : "r" (s->buf), "r" (n), "0" (s->index), "1" (value)
301 uint32_t *ptr= (uint32_t*)(((uint8_t *)s->buf)+(index>>3));
303 ptr[0] |= be2me_32(value<<(32-n-(index&7) ));
305 //if(n>24) printf("%d %d\n", n, value);
309 # endif //!ALIGNED_BITSTREAM_WRITER
313 static inline void put_sbits(PutBitContext *pb, int bits, int32_t val)
315 assert(bits >= 0 && bits <= 31);
317 put_bits(pb, bits, val & ((1<<bits)-1));
321 static inline uint8_t* pbBufPtr(PutBitContext *s)
323 #ifdef ALT_BITSTREAM_WRITER
324 return s->buf + (s->index>>3);
332 * PutBitContext must be flushed & aligned to a byte boundary before calling this.
334 static inline void skip_put_bytes(PutBitContext *s, int n){
335 assert((put_bits_count(s)&7)==0);
336 #ifdef ALT_BITSTREAM_WRITER
337 FIXME may need some cleaning of the buffer
340 assert(s->bit_left==32);
346 * Skips the given number of bits.
347 * Must only be used if the actual values in the bitstream do not matter.
348 * If \p n is 0 the behavior is undefined.
350 static inline void skip_put_bits(PutBitContext *s, int n){
351 #ifdef ALT_BITSTREAM_WRITER
355 s->buf_ptr-= s->bit_left>>5;
361 * Changes the end of the buffer.
363 static inline void set_put_bits_buffer_size(PutBitContext *s, int size){
364 s->buf_end= s->buf + size;
367 /* Bitstream reader API docs:
369 arbitrary name which is used as prefix for the internal variables
374 OPEN_READER(name, gb)
375 loads gb into local variables
377 CLOSE_READER(name, gb)
378 stores local vars in gb
380 UPDATE_CACHE(name, gb)
381 refills the internal cache from the bitstream
382 after this call at least MIN_CACHE_BITS will be available,
385 will output the contents of the internal cache, next bit is MSB of 32 or 64 bit (FIXME 64bit)
387 SHOW_UBITS(name, gb, num)
388 will return the next num bits
390 SHOW_SBITS(name, gb, num)
391 will return the next num bits and do sign extension
393 SKIP_BITS(name, gb, num)
394 will skip over the next num bits
395 note, this is equivalent to SKIP_CACHE; SKIP_COUNTER
397 SKIP_CACHE(name, gb, num)
398 will remove the next num bits from the cache (note SKIP_COUNTER MUST be called before UPDATE_CACHE / CLOSE_READER)
400 SKIP_COUNTER(name, gb, num)
401 will increment the internal bit counter (see SKIP_CACHE & SKIP_BITS)
403 LAST_SKIP_CACHE(name, gb, num)
404 will remove the next num bits from the cache if it is needed for UPDATE_CACHE otherwise it will do nothing
406 LAST_SKIP_BITS(name, gb, num)
407 is equivalent to SKIP_LAST_CACHE; SKIP_COUNTER
409 for examples see get_bits, show_bits, skip_bits, get_vlc
412 #ifdef ALT_BITSTREAM_READER
413 # define MIN_CACHE_BITS 25
415 # define OPEN_READER(name, gb)\
416 int name##_index= (gb)->index;\
417 int name##_cache= 0;\
419 # define CLOSE_READER(name, gb)\
420 (gb)->index= name##_index;\
422 # ifdef ALT_BITSTREAM_READER_LE
423 # define UPDATE_CACHE(name, gb)\
424 name##_cache= AV_RL32( ((const uint8_t *)(gb)->buffer)+(name##_index>>3) ) >> (name##_index&0x07);\
426 # define SKIP_CACHE(name, gb, num)\
427 name##_cache >>= (num);
429 # define UPDATE_CACHE(name, gb)\
430 name##_cache= AV_RB32( ((const uint8_t *)(gb)->buffer)+(name##_index>>3) ) << (name##_index&0x07);\
432 # define SKIP_CACHE(name, gb, num)\
433 name##_cache <<= (num);
437 # define SKIP_COUNTER(name, gb, num)\
438 name##_index += (num);\
440 # define SKIP_BITS(name, gb, num)\
442 SKIP_CACHE(name, gb, num)\
443 SKIP_COUNTER(name, gb, num)\
446 # define LAST_SKIP_BITS(name, gb, num) SKIP_COUNTER(name, gb, num)
447 # define LAST_SKIP_CACHE(name, gb, num) ;
449 # ifdef ALT_BITSTREAM_READER_LE
450 # define SHOW_UBITS(name, gb, num)\
451 ((name##_cache) & (NEG_USR32(0xffffffff,num)))
453 # define SHOW_SBITS(name, gb, num)\
454 NEG_SSR32((name##_cache)<<(32-(num)), num)
456 # define SHOW_UBITS(name, gb, num)\
457 NEG_USR32(name##_cache, num)
459 # define SHOW_SBITS(name, gb, num)\
460 NEG_SSR32(name##_cache, num)
463 # define GET_CACHE(name, gb)\
464 ((uint32_t)name##_cache)
466 static inline int get_bits_count(GetBitContext *s){
470 static inline void skip_bits_long(GetBitContext *s, int n){
474 #elif defined LIBMPEG2_BITSTREAM_READER
475 //libmpeg2 like reader
477 # define MIN_CACHE_BITS 17
479 # define OPEN_READER(name, gb)\
480 int name##_bit_count=(gb)->bit_count;\
481 int name##_cache= (gb)->cache;\
482 uint8_t * name##_buffer_ptr=(gb)->buffer_ptr;\
484 # define CLOSE_READER(name, gb)\
485 (gb)->bit_count= name##_bit_count;\
486 (gb)->cache= name##_cache;\
487 (gb)->buffer_ptr= name##_buffer_ptr;\
489 # define UPDATE_CACHE(name, gb)\
490 if(name##_bit_count >= 0){\
491 name##_cache+= AV_RB16(name##_buffer_ptr) << name##_bit_count; \
492 name##_buffer_ptr+=2;\
493 name##_bit_count-= 16;\
496 # define SKIP_CACHE(name, gb, num)\
497 name##_cache <<= (num);\
499 # define SKIP_COUNTER(name, gb, num)\
500 name##_bit_count += (num);\
502 # define SKIP_BITS(name, gb, num)\
504 SKIP_CACHE(name, gb, num)\
505 SKIP_COUNTER(name, gb, num)\
508 # define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num)
509 # define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num)
511 # define SHOW_UBITS(name, gb, num)\
512 NEG_USR32(name##_cache, num)
514 # define SHOW_SBITS(name, gb, num)\
515 NEG_SSR32(name##_cache, num)
517 # define GET_CACHE(name, gb)\
518 ((uint32_t)name##_cache)
520 static inline int get_bits_count(GetBitContext *s){
521 return (s->buffer_ptr - s->buffer)*8 - 16 + s->bit_count;
524 static inline void skip_bits_long(GetBitContext *s, int n){
527 re_buffer_ptr += 2*(re_bit_count>>4);
529 re_cache = ((re_buffer_ptr[-2]<<8) + re_buffer_ptr[-1]) << (16+re_bit_count);
534 #elif defined A32_BITSTREAM_READER
536 # define MIN_CACHE_BITS 32
538 # define OPEN_READER(name, gb)\
539 int name##_bit_count=(gb)->bit_count;\
540 uint32_t name##_cache0= (gb)->cache0;\
541 uint32_t name##_cache1= (gb)->cache1;\
542 uint32_t * name##_buffer_ptr=(gb)->buffer_ptr;\
544 # define CLOSE_READER(name, gb)\
545 (gb)->bit_count= name##_bit_count;\
546 (gb)->cache0= name##_cache0;\
547 (gb)->cache1= name##_cache1;\
548 (gb)->buffer_ptr= name##_buffer_ptr;\
550 # define UPDATE_CACHE(name, gb)\
551 if(name##_bit_count > 0){\
552 const uint32_t next= be2me_32( *name##_buffer_ptr );\
553 name##_cache0 |= NEG_USR32(next,name##_bit_count);\
554 name##_cache1 |= next<<name##_bit_count;\
555 name##_buffer_ptr++;\
556 name##_bit_count-= 32;\
560 # define SKIP_CACHE(name, gb, num)\
562 "shldl %2, %1, %0 \n\t"\
564 : "+r" (name##_cache0), "+r" (name##_cache1)\
565 : "Ic" ((uint8_t)(num))\
568 # define SKIP_CACHE(name, gb, num)\
569 name##_cache0 <<= (num);\
570 name##_cache0 |= NEG_USR32(name##_cache1,num);\
571 name##_cache1 <<= (num);
574 # define SKIP_COUNTER(name, gb, num)\
575 name##_bit_count += (num);\
577 # define SKIP_BITS(name, gb, num)\
579 SKIP_CACHE(name, gb, num)\
580 SKIP_COUNTER(name, gb, num)\
583 # define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num)
584 # define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num)
586 # define SHOW_UBITS(name, gb, num)\
587 NEG_USR32(name##_cache0, num)
589 # define SHOW_SBITS(name, gb, num)\
590 NEG_SSR32(name##_cache0, num)
592 # define GET_CACHE(name, gb)\
595 static inline int get_bits_count(GetBitContext *s){
596 return ((uint8_t*)s->buffer_ptr - s->buffer)*8 - 32 + s->bit_count;
599 static inline void skip_bits_long(GetBitContext *s, int n){
602 re_buffer_ptr += re_bit_count>>5;
604 re_cache0 = be2me_32( re_buffer_ptr[-1] ) << re_bit_count;
613 * read mpeg1 dc style vlc (sign bit + mantisse with no MSB).
614 * if MSB not set it is negative
615 * @param n length in bits
618 static inline int get_xbits(GetBitContext *s, int n){
620 register int32_t cache;
623 cache = GET_CACHE(re,s);
625 LAST_SKIP_BITS(re, s, n)
627 return (NEG_USR32(sign ^ cache, n) ^ sign) - sign;
630 static inline int get_sbits(GetBitContext *s, int n){
634 tmp= SHOW_SBITS(re, s, n);
635 LAST_SKIP_BITS(re, s, n)
642 * Note, the alt bitstream reader can read up to 25 bits, but the libmpeg2 reader can't
644 static inline unsigned int get_bits(GetBitContext *s, int n){
648 tmp= SHOW_UBITS(re, s, n);
649 LAST_SKIP_BITS(re, s, n)
656 * Note, the alt bitstream reader can read up to 25 bits, but the libmpeg2 reader can't
658 static inline unsigned int show_bits(GetBitContext *s, int n){
662 tmp= SHOW_UBITS(re, s, n);
663 // CLOSE_READER(re, s)
667 static inline void skip_bits(GetBitContext *s, int n){
668 //Note gcc seems to optimize this to s->index+=n for the ALT_READER :))
671 LAST_SKIP_BITS(re, s, n)
675 static inline unsigned int get_bits1(GetBitContext *s){
676 #ifdef ALT_BITSTREAM_READER
678 uint8_t result= s->buffer[ index>>3 ];
679 #ifdef ALT_BITSTREAM_READER_LE
680 result>>= (index&0x07);
683 result<<= (index&0x07);
691 return get_bits(s, 1);
695 static inline unsigned int show_bits1(GetBitContext *s){
696 return show_bits(s, 1);
699 static inline void skip_bits1(GetBitContext *s){
706 static inline unsigned int get_bits_long(GetBitContext *s, int n){
707 if(n<=17) return get_bits(s, n);
709 #ifdef ALT_BITSTREAM_READER_LE
710 int ret= get_bits(s, 16);
711 return ret | (get_bits(s, n-16) << 16);
713 int ret= get_bits(s, 16) << (n-16);
714 return ret | get_bits(s, n-16);
720 * reads 0-32 bits as a signed integer.
722 static inline int get_sbits_long(GetBitContext *s, int n) {
723 return sign_extend(get_bits_long(s, n), n);
729 static inline unsigned int show_bits_long(GetBitContext *s, int n){
730 if(n<=17) return show_bits(s, n);
732 GetBitContext gb= *s;
733 return get_bits_long(&gb, n);
737 static inline int check_marker(GetBitContext *s, const char *msg)
739 int bit= get_bits1(s);
741 av_log(NULL, AV_LOG_INFO, "Marker bit missing %s\n", msg);
747 * init GetBitContext.
748 * @param buffer bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE bytes larger then the actual read bits
749 * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
750 * @param bit_size the size of the buffer in bits
752 static inline void init_get_bits(GetBitContext *s,
753 const uint8_t *buffer, int bit_size)
755 int buffer_size= (bit_size+7)>>3;
756 if(buffer_size < 0 || bit_size < 0) {
757 buffer_size = bit_size = 0;
762 s->size_in_bits= bit_size;
763 s->buffer_end= buffer + buffer_size;
764 #ifdef ALT_BITSTREAM_READER
766 #elif defined LIBMPEG2_BITSTREAM_READER
767 s->buffer_ptr = (uint8_t*)((intptr_t)buffer&(~1));
768 s->bit_count = 16 + 8*((intptr_t)buffer&1);
769 skip_bits_long(s, 0);
770 #elif defined A32_BITSTREAM_READER
771 s->buffer_ptr = (uint32_t*)((intptr_t)buffer&(~3));
772 s->bit_count = 32 + 8*((intptr_t)buffer&3);
773 skip_bits_long(s, 0);
777 static inline void align_get_bits(GetBitContext *s)
779 int n= (-get_bits_count(s)) & 7;
780 if(n) skip_bits(s, n);
783 #define init_vlc(vlc, nb_bits, nb_codes,\
784 bits, bits_wrap, bits_size,\
785 codes, codes_wrap, codes_size,\
787 init_vlc_sparse(vlc, nb_bits, nb_codes,\
788 bits, bits_wrap, bits_size,\
789 codes, codes_wrap, codes_size,\
792 int init_vlc_sparse(VLC *vlc, int nb_bits, int nb_codes,
793 const void *bits, int bits_wrap, int bits_size,
794 const void *codes, int codes_wrap, int codes_size,
795 const void *symbols, int symbols_wrap, int symbols_size,
797 #define INIT_VLC_USE_STATIC 1 ///< VERY strongly deprecated and forbidden
798 #define INIT_VLC_LE 2
799 #define INIT_VLC_USE_NEW_STATIC 4
800 void free_vlc(VLC *vlc);
802 #define INIT_VLC_STATIC(vlc, bits, a,b,c,d,e,f,g, static_size)\
804 static VLC_TYPE table[static_size][2];\
805 (vlc)->table= table;\
806 (vlc)->table_allocated= static_size;\
807 init_vlc(vlc, bits, a,b,c,d,e,f,g, INIT_VLC_USE_NEW_STATIC);\
813 * if the vlc code is invalid and max_depth=1 than no bits will be removed
814 * if the vlc code is invalid and max_depth>1 than the number of bits removed
817 #define GET_VLC(code, name, gb, table, bits, max_depth)\
819 int n, index, nb_bits;\
821 index= SHOW_UBITS(name, gb, bits);\
822 code = table[index][0];\
823 n = table[index][1];\
825 if(max_depth > 1 && n < 0){\
826 LAST_SKIP_BITS(name, gb, bits)\
827 UPDATE_CACHE(name, gb)\
831 index= SHOW_UBITS(name, gb, nb_bits) + code;\
832 code = table[index][0];\
833 n = table[index][1];\
834 if(max_depth > 2 && n < 0){\
835 LAST_SKIP_BITS(name, gb, nb_bits)\
836 UPDATE_CACHE(name, gb)\
840 index= SHOW_UBITS(name, gb, nb_bits) + code;\
841 code = table[index][0];\
842 n = table[index][1];\
845 SKIP_BITS(name, gb, n)\
848 #define GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update)\
850 int n, index, nb_bits;\
852 index= SHOW_UBITS(name, gb, bits);\
853 level = table[index].level;\
854 n = table[index].len;\
856 if(max_depth > 1 && n < 0){\
857 SKIP_BITS(name, gb, bits)\
859 UPDATE_CACHE(name, gb)\
864 index= SHOW_UBITS(name, gb, nb_bits) + level;\
865 level = table[index].level;\
866 n = table[index].len;\
868 run= table[index].run;\
869 SKIP_BITS(name, gb, n)\
874 * parses a vlc code, faster then get_vlc()
875 * @param bits is the number of bits which will be read at once, must be
876 * identical to nb_bits in init_vlc()
877 * @param max_depth is the number of times bits bits must be read to completely
878 * read the longest vlc code
879 * = (max_vlc_length + bits - 1) / bits
881 static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE (*table)[2],
882 int bits, int max_depth)
889 GET_VLC(code, re, s, table, bits, max_depth)
898 static inline void print_bin(int bits, int n){
901 for(i=n-1; i>=0; i--){
902 av_log(NULL, AV_LOG_DEBUG, "%d", (bits>>i)&1);
905 av_log(NULL, AV_LOG_DEBUG, " ");
908 static inline int get_bits_trace(GetBitContext *s, int n, char *file, const char *func, int line){
909 int r= get_bits(s, n);
912 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);
915 static inline int get_vlc_trace(GetBitContext *s, VLC_TYPE (*table)[2], int bits, int max_depth, char *file, const char *func, int line){
916 int show= show_bits(s, 24);
917 int pos= get_bits_count(s);
918 int r= get_vlc2(s, table, bits, max_depth);
919 int len= get_bits_count(s) - pos;
920 int bits2= show>>(24-len);
922 print_bin(bits2, len);
924 av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d vlc @%5d in %s %s:%d\n", bits2, len, r, pos, file, func, line);
927 static inline int get_xbits_trace(GetBitContext *s, int n, char *file, const char *func, int line){
928 int show= show_bits(s, n);
929 int r= get_xbits(s, n);
932 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);
936 #define get_bits(s, n) get_bits_trace(s, n, __FILE__, __PRETTY_FUNCTION__, __LINE__)
937 #define get_bits1(s) get_bits_trace(s, 1, __FILE__, __PRETTY_FUNCTION__, __LINE__)
938 #define get_xbits(s, n) get_xbits_trace(s, n, __FILE__, __PRETTY_FUNCTION__, __LINE__)
939 #define get_vlc(s, vlc) get_vlc_trace(s, (vlc)->table, (vlc)->bits, 3, __FILE__, __PRETTY_FUNCTION__, __LINE__)
940 #define get_vlc2(s, tab, bits, max) get_vlc_trace(s, tab, bits, max, __FILE__, __PRETTY_FUNCTION__, __LINE__)
942 #define tprintf(p, ...) av_log(p, AV_LOG_DEBUG, __VA_ARGS__)
945 #define tprintf(p, ...) {}
948 static inline int decode012(GetBitContext *gb){
954 return get_bits1(gb) + 1;
957 static inline int decode210(GetBitContext *gb){
961 return 2 - get_bits1(gb);
964 #endif /* AVCODEC_BITSTREAM_H */