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;
158 void align_put_bits(PutBitContext *s);
159 void ff_put_string(PutBitContext * pbc, const char *s, int put_zero);
160 void ff_copy_bits(PutBitContext *pb, const uint8_t *src, int length);
163 /* buffer, buffer_end and size_in_bits must be present and used by every reader */
164 typedef struct GetBitContext {
165 const uint8_t *buffer, *buffer_end;
166 #ifdef ALT_BITSTREAM_READER
168 #elif defined LIBMPEG2_BITSTREAM_READER
172 #elif defined A32_BITSTREAM_READER
173 uint32_t *buffer_ptr;
181 #define VLC_TYPE int16_t
185 VLC_TYPE (*table)[2]; ///< code, bits
186 int table_size, table_allocated;
189 typedef struct RL_VLC_ELEM {
195 #ifndef ALT_BITSTREAM_WRITER
196 static inline void put_bits(PutBitContext *s, int n, unsigned int value)
198 unsigned int bit_buf;
201 // printf("put_bits=%d %x\n", n, value);
202 assert(n == 32 || value < (1U << n));
204 bit_buf = s->bit_buf;
205 bit_left = s->bit_left;
207 // printf("n=%d value=%x cnt=%d buf=%x\n", n, value, bit_cnt, bit_buf);
209 #ifdef BITSTREAM_WRITER_LE
210 bit_buf |= value << (32 - bit_left);
212 #if !HAVE_FAST_UNALIGNED
213 if (3 & (intptr_t) s->buf_ptr) {
214 AV_WL32(s->buf_ptr, bit_buf);
217 *(uint32_t *)s->buf_ptr = le2me_32(bit_buf);
219 bit_buf = (bit_left==32)?0:value >> bit_left;
225 bit_buf = (bit_buf<<n) | value;
229 bit_buf |= value >> (n - bit_left);
230 #if !HAVE_FAST_UNALIGNED
231 if (3 & (intptr_t) s->buf_ptr) {
232 AV_WB32(s->buf_ptr, bit_buf);
235 *(uint32_t *)s->buf_ptr = be2me_32(bit_buf);
236 //printf("bitbuf = %08x\n", bit_buf);
243 s->bit_buf = bit_buf;
244 s->bit_left = bit_left;
249 #ifdef ALT_BITSTREAM_WRITER
250 static inline void put_bits(PutBitContext *s, int n, unsigned int value)
252 # ifdef ALIGNED_BITSTREAM_WRITER
255 "movl %0, %%ecx \n\t"
256 "xorl %%eax, %%eax \n\t"
257 "shrdl %%cl, %1, %%eax \n\t"
259 "movl %0, %%ecx \n\t"
260 "shrl $3, %%ecx \n\t"
261 "andl $0xFFFFFFFC, %%ecx \n\t"
263 "orl %1, (%2, %%ecx) \n\t"
266 "movl %%eax, 4(%2, %%ecx) \n\t"
267 : "=&r" (s->index), "=&r" (value)
268 : "r" (s->buf), "r" (n), "0" (s->index), "1" (value<<(-n))
273 uint32_t *ptr= ((uint32_t *)s->buf)+(index>>5);
277 ptr[0] |= be2me_32(value>>(index&31));
278 ptr[1] = be2me_32(value<<(32-(index&31)));
279 //if(n>24) printf("%d %d\n", n, value);
283 # else //ALIGNED_BITSTREAM_WRITER
286 "movl $7, %%ecx \n\t"
287 "andl %0, %%ecx \n\t"
288 "addl %3, %%ecx \n\t"
292 "movl %0, %%ecx \n\t"
293 "shrl $3, %%ecx \n\t"
294 "orl %1, (%%ecx, %2) \n\t"
296 "movl $0, 4(%%ecx, %2) \n\t"
297 : "=&r" (s->index), "=&r" (value)
298 : "r" (s->buf), "r" (n), "0" (s->index), "1" (value)
303 uint32_t *ptr= (uint32_t*)(((uint8_t *)s->buf)+(index>>3));
305 ptr[0] |= be2me_32(value<<(32-n-(index&7) ));
307 //if(n>24) printf("%d %d\n", n, value);
311 # endif //!ALIGNED_BITSTREAM_WRITER
315 static inline void put_sbits(PutBitContext *pb, int bits, int32_t val)
317 assert(bits >= 0 && bits <= 31);
319 put_bits(pb, bits, val & ((1<<bits)-1));
323 static inline uint8_t* pbBufPtr(PutBitContext *s)
325 #ifdef ALT_BITSTREAM_WRITER
326 return s->buf + (s->index>>3);
334 * PutBitContext must be flushed & aligned to a byte boundary before calling this.
336 static inline void skip_put_bytes(PutBitContext *s, int n){
337 assert((put_bits_count(s)&7)==0);
338 #ifdef ALT_BITSTREAM_WRITER
339 FIXME may need some cleaning of the buffer
342 assert(s->bit_left==32);
348 * Skips the given number of bits.
349 * Must only be used if the actual values in the bitstream do not matter.
350 * If \p n is 0 the behavior is undefined.
352 static inline void skip_put_bits(PutBitContext *s, int n){
353 #ifdef ALT_BITSTREAM_WRITER
357 s->buf_ptr-= s->bit_left>>5;
363 * Changes the end of the buffer.
365 static inline void set_put_bits_buffer_size(PutBitContext *s, int size){
366 s->buf_end= s->buf + size;
369 /* Bitstream reader API docs:
371 arbitrary name which is used as prefix for the internal variables
376 OPEN_READER(name, gb)
377 loads gb into local variables
379 CLOSE_READER(name, gb)
380 stores local vars in gb
382 UPDATE_CACHE(name, gb)
383 refills the internal cache from the bitstream
384 after this call at least MIN_CACHE_BITS will be available,
387 will output the contents of the internal cache, next bit is MSB of 32 or 64 bit (FIXME 64bit)
389 SHOW_UBITS(name, gb, num)
390 will return the next num bits
392 SHOW_SBITS(name, gb, num)
393 will return the next num bits and do sign extension
395 SKIP_BITS(name, gb, num)
396 will skip over the next num bits
397 note, this is equivalent to SKIP_CACHE; SKIP_COUNTER
399 SKIP_CACHE(name, gb, num)
400 will remove the next num bits from the cache (note SKIP_COUNTER MUST be called before UPDATE_CACHE / CLOSE_READER)
402 SKIP_COUNTER(name, gb, num)
403 will increment the internal bit counter (see SKIP_CACHE & SKIP_BITS)
405 LAST_SKIP_CACHE(name, gb, num)
406 will remove the next num bits from the cache if it is needed for UPDATE_CACHE otherwise it will do nothing
408 LAST_SKIP_BITS(name, gb, num)
409 is equivalent to SKIP_LAST_CACHE; SKIP_COUNTER
411 for examples see get_bits, show_bits, skip_bits, get_vlc
414 #ifdef ALT_BITSTREAM_READER
415 # define MIN_CACHE_BITS 25
417 # define OPEN_READER(name, gb)\
418 int name##_index= (gb)->index;\
419 int name##_cache= 0;\
421 # define CLOSE_READER(name, gb)\
422 (gb)->index= name##_index;\
424 # ifdef ALT_BITSTREAM_READER_LE
425 # define UPDATE_CACHE(name, gb)\
426 name##_cache= AV_RL32( ((const uint8_t *)(gb)->buffer)+(name##_index>>3) ) >> (name##_index&0x07);\
428 # define SKIP_CACHE(name, gb, num)\
429 name##_cache >>= (num);
431 # define UPDATE_CACHE(name, gb)\
432 name##_cache= AV_RB32( ((const uint8_t *)(gb)->buffer)+(name##_index>>3) ) << (name##_index&0x07);\
434 # define SKIP_CACHE(name, gb, num)\
435 name##_cache <<= (num);
439 # define SKIP_COUNTER(name, gb, num)\
440 name##_index += (num);\
442 # define SKIP_BITS(name, gb, num)\
444 SKIP_CACHE(name, gb, num)\
445 SKIP_COUNTER(name, gb, num)\
448 # define LAST_SKIP_BITS(name, gb, num) SKIP_COUNTER(name, gb, num)
449 # define LAST_SKIP_CACHE(name, gb, num) ;
451 # ifdef ALT_BITSTREAM_READER_LE
452 # define SHOW_UBITS(name, gb, num)\
453 ((name##_cache) & (NEG_USR32(0xffffffff,num)))
455 # define SHOW_SBITS(name, gb, num)\
456 NEG_SSR32((name##_cache)<<(32-(num)), num)
458 # define SHOW_UBITS(name, gb, num)\
459 NEG_USR32(name##_cache, num)
461 # define SHOW_SBITS(name, gb, num)\
462 NEG_SSR32(name##_cache, num)
465 # define GET_CACHE(name, gb)\
466 ((uint32_t)name##_cache)
468 static inline int get_bits_count(GetBitContext *s){
472 static inline void skip_bits_long(GetBitContext *s, int n){
476 #elif defined LIBMPEG2_BITSTREAM_READER
477 //libmpeg2 like reader
479 # define MIN_CACHE_BITS 17
481 # define OPEN_READER(name, gb)\
482 int name##_bit_count=(gb)->bit_count;\
483 int name##_cache= (gb)->cache;\
484 uint8_t * name##_buffer_ptr=(gb)->buffer_ptr;\
486 # define CLOSE_READER(name, gb)\
487 (gb)->bit_count= name##_bit_count;\
488 (gb)->cache= name##_cache;\
489 (gb)->buffer_ptr= name##_buffer_ptr;\
491 # define UPDATE_CACHE(name, gb)\
492 if(name##_bit_count >= 0){\
493 name##_cache+= AV_RB16(name##_buffer_ptr) << name##_bit_count; \
494 name##_buffer_ptr+=2;\
495 name##_bit_count-= 16;\
498 # define SKIP_CACHE(name, gb, num)\
499 name##_cache <<= (num);\
501 # define SKIP_COUNTER(name, gb, num)\
502 name##_bit_count += (num);\
504 # define SKIP_BITS(name, gb, num)\
506 SKIP_CACHE(name, gb, num)\
507 SKIP_COUNTER(name, gb, num)\
510 # define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num)
511 # define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num)
513 # define SHOW_UBITS(name, gb, num)\
514 NEG_USR32(name##_cache, num)
516 # define SHOW_SBITS(name, gb, num)\
517 NEG_SSR32(name##_cache, num)
519 # define GET_CACHE(name, gb)\
520 ((uint32_t)name##_cache)
522 static inline int get_bits_count(GetBitContext *s){
523 return (s->buffer_ptr - s->buffer)*8 - 16 + s->bit_count;
526 static inline void skip_bits_long(GetBitContext *s, int n){
529 re_buffer_ptr += 2*(re_bit_count>>4);
531 re_cache = ((re_buffer_ptr[-2]<<8) + re_buffer_ptr[-1]) << (16+re_bit_count);
536 #elif defined A32_BITSTREAM_READER
538 # define MIN_CACHE_BITS 32
540 # define OPEN_READER(name, gb)\
541 int name##_bit_count=(gb)->bit_count;\
542 uint32_t name##_cache0= (gb)->cache0;\
543 uint32_t name##_cache1= (gb)->cache1;\
544 uint32_t * name##_buffer_ptr=(gb)->buffer_ptr;\
546 # define CLOSE_READER(name, gb)\
547 (gb)->bit_count= name##_bit_count;\
548 (gb)->cache0= name##_cache0;\
549 (gb)->cache1= name##_cache1;\
550 (gb)->buffer_ptr= name##_buffer_ptr;\
552 # define UPDATE_CACHE(name, gb)\
553 if(name##_bit_count > 0){\
554 const uint32_t next= be2me_32( *name##_buffer_ptr );\
555 name##_cache0 |= NEG_USR32(next,name##_bit_count);\
556 name##_cache1 |= next<<name##_bit_count;\
557 name##_buffer_ptr++;\
558 name##_bit_count-= 32;\
562 # define SKIP_CACHE(name, gb, num)\
564 "shldl %2, %1, %0 \n\t"\
566 : "+r" (name##_cache0), "+r" (name##_cache1)\
567 : "Ic" ((uint8_t)(num))\
570 # define SKIP_CACHE(name, gb, num)\
571 name##_cache0 <<= (num);\
572 name##_cache0 |= NEG_USR32(name##_cache1,num);\
573 name##_cache1 <<= (num);
576 # define SKIP_COUNTER(name, gb, num)\
577 name##_bit_count += (num);\
579 # define SKIP_BITS(name, gb, num)\
581 SKIP_CACHE(name, gb, num)\
582 SKIP_COUNTER(name, gb, num)\
585 # define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num)
586 # define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num)
588 # define SHOW_UBITS(name, gb, num)\
589 NEG_USR32(name##_cache0, num)
591 # define SHOW_SBITS(name, gb, num)\
592 NEG_SSR32(name##_cache0, num)
594 # define GET_CACHE(name, gb)\
597 static inline int get_bits_count(GetBitContext *s){
598 return ((uint8_t*)s->buffer_ptr - s->buffer)*8 - 32 + s->bit_count;
601 static inline void skip_bits_long(GetBitContext *s, int n){
604 re_buffer_ptr += re_bit_count>>5;
606 re_cache0 = be2me_32( re_buffer_ptr[-1] ) << re_bit_count;
615 * read mpeg1 dc style vlc (sign bit + mantisse with no MSB).
616 * if MSB not set it is negative
617 * @param n length in bits
620 static inline int get_xbits(GetBitContext *s, int n){
622 register int32_t cache;
625 cache = GET_CACHE(re,s);
627 LAST_SKIP_BITS(re, s, n)
629 return (NEG_USR32(sign ^ cache, n) ^ sign) - sign;
632 static inline int get_sbits(GetBitContext *s, int n){
636 tmp= SHOW_SBITS(re, s, n);
637 LAST_SKIP_BITS(re, s, n)
644 * Note, the alt bitstream reader can read up to 25 bits, but the libmpeg2 reader can't
646 static inline unsigned int get_bits(GetBitContext *s, int n){
650 tmp= SHOW_UBITS(re, s, n);
651 LAST_SKIP_BITS(re, s, n)
658 * Note, the alt bitstream reader can read up to 25 bits, but the libmpeg2 reader can't
660 static inline unsigned int show_bits(GetBitContext *s, int n){
664 tmp= SHOW_UBITS(re, s, n);
665 // CLOSE_READER(re, s)
669 static inline void skip_bits(GetBitContext *s, int n){
670 //Note gcc seems to optimize this to s->index+=n for the ALT_READER :))
673 LAST_SKIP_BITS(re, s, n)
677 static inline unsigned int get_bits1(GetBitContext *s){
678 #ifdef ALT_BITSTREAM_READER
680 uint8_t result= s->buffer[ index>>3 ];
681 #ifdef ALT_BITSTREAM_READER_LE
682 result>>= (index&0x07);
685 result<<= (index&0x07);
693 return get_bits(s, 1);
697 static inline unsigned int show_bits1(GetBitContext *s){
698 return show_bits(s, 1);
701 static inline void skip_bits1(GetBitContext *s){
708 static inline unsigned int get_bits_long(GetBitContext *s, int n){
709 if(n<=17) return get_bits(s, n);
711 #ifdef ALT_BITSTREAM_READER_LE
712 int ret= get_bits(s, 16);
713 return ret | (get_bits(s, n-16) << 16);
715 int ret= get_bits(s, 16) << (n-16);
716 return ret | get_bits(s, n-16);
722 * reads 0-32 bits as a signed integer.
724 static inline int get_sbits_long(GetBitContext *s, int n) {
725 return sign_extend(get_bits_long(s, n), n);
731 static inline unsigned int show_bits_long(GetBitContext *s, int n){
732 if(n<=17) return show_bits(s, n);
734 GetBitContext gb= *s;
735 return get_bits_long(&gb, n);
739 static inline int check_marker(GetBitContext *s, const char *msg)
741 int bit= get_bits1(s);
743 av_log(NULL, AV_LOG_INFO, "Marker bit missing %s\n", msg);
749 * init GetBitContext.
750 * @param buffer bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE bytes larger then the actual read bits
751 * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
752 * @param bit_size the size of the buffer in bits
754 static inline void init_get_bits(GetBitContext *s,
755 const uint8_t *buffer, int bit_size)
757 int buffer_size= (bit_size+7)>>3;
758 if(buffer_size < 0 || bit_size < 0) {
759 buffer_size = bit_size = 0;
764 s->size_in_bits= bit_size;
765 s->buffer_end= buffer + buffer_size;
766 #ifdef ALT_BITSTREAM_READER
768 #elif defined LIBMPEG2_BITSTREAM_READER
769 s->buffer_ptr = (uint8_t*)((intptr_t)buffer&(~1));
770 s->bit_count = 16 + 8*((intptr_t)buffer&1);
771 skip_bits_long(s, 0);
772 #elif defined A32_BITSTREAM_READER
773 s->buffer_ptr = (uint32_t*)((intptr_t)buffer&(~3));
774 s->bit_count = 32 + 8*((intptr_t)buffer&3);
775 skip_bits_long(s, 0);
779 static inline void align_get_bits(GetBitContext *s)
781 int n= (-get_bits_count(s)) & 7;
782 if(n) skip_bits(s, n);
785 #define init_vlc(vlc, nb_bits, nb_codes,\
786 bits, bits_wrap, bits_size,\
787 codes, codes_wrap, codes_size,\
789 init_vlc_sparse(vlc, nb_bits, nb_codes,\
790 bits, bits_wrap, bits_size,\
791 codes, codes_wrap, codes_size,\
794 int init_vlc_sparse(VLC *vlc, int nb_bits, int nb_codes,
795 const void *bits, int bits_wrap, int bits_size,
796 const void *codes, int codes_wrap, int codes_size,
797 const void *symbols, int symbols_wrap, int symbols_size,
799 #define INIT_VLC_USE_STATIC 1 ///< VERY strongly deprecated and forbidden
800 #define INIT_VLC_LE 2
801 #define INIT_VLC_USE_NEW_STATIC 4
802 void free_vlc(VLC *vlc);
804 #define INIT_VLC_STATIC(vlc, bits, a,b,c,d,e,f,g, static_size)\
806 static VLC_TYPE table[static_size][2];\
807 (vlc)->table= table;\
808 (vlc)->table_allocated= static_size;\
809 init_vlc(vlc, bits, a,b,c,d,e,f,g, INIT_VLC_USE_NEW_STATIC);\
815 * if the vlc code is invalid and max_depth=1 than no bits will be removed
816 * if the vlc code is invalid and max_depth>1 than the number of bits removed
819 #define GET_VLC(code, name, gb, table, bits, max_depth)\
821 int n, index, nb_bits;\
823 index= SHOW_UBITS(name, gb, bits);\
824 code = table[index][0];\
825 n = table[index][1];\
827 if(max_depth > 1 && n < 0){\
828 LAST_SKIP_BITS(name, gb, bits)\
829 UPDATE_CACHE(name, gb)\
833 index= SHOW_UBITS(name, gb, nb_bits) + code;\
834 code = table[index][0];\
835 n = table[index][1];\
836 if(max_depth > 2 && n < 0){\
837 LAST_SKIP_BITS(name, gb, nb_bits)\
838 UPDATE_CACHE(name, gb)\
842 index= SHOW_UBITS(name, gb, nb_bits) + code;\
843 code = table[index][0];\
844 n = table[index][1];\
847 SKIP_BITS(name, gb, n)\
850 #define GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update)\
852 int n, index, nb_bits;\
854 index= SHOW_UBITS(name, gb, bits);\
855 level = table[index].level;\
856 n = table[index].len;\
858 if(max_depth > 1 && n < 0){\
859 SKIP_BITS(name, gb, bits)\
861 UPDATE_CACHE(name, gb)\
866 index= SHOW_UBITS(name, gb, nb_bits) + level;\
867 level = table[index].level;\
868 n = table[index].len;\
870 run= table[index].run;\
871 SKIP_BITS(name, gb, n)\
876 * parses a vlc code, faster then get_vlc()
877 * @param bits is the number of bits which will be read at once, must be
878 * identical to nb_bits in init_vlc()
879 * @param max_depth is the number of times bits bits must be read to completely
880 * read the longest vlc code
881 * = (max_vlc_length + bits - 1) / bits
883 static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE (*table)[2],
884 int bits, int max_depth)
891 GET_VLC(code, re, s, table, bits, max_depth)
900 static inline void print_bin(int bits, int n){
903 for(i=n-1; i>=0; i--){
904 av_log(NULL, AV_LOG_DEBUG, "%d", (bits>>i)&1);
907 av_log(NULL, AV_LOG_DEBUG, " ");
910 static inline int get_bits_trace(GetBitContext *s, int n, char *file, const char *func, int line){
911 int r= get_bits(s, n);
914 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);
917 static inline int get_vlc_trace(GetBitContext *s, VLC_TYPE (*table)[2], int bits, int max_depth, char *file, const char *func, int line){
918 int show= show_bits(s, 24);
919 int pos= get_bits_count(s);
920 int r= get_vlc2(s, table, bits, max_depth);
921 int len= get_bits_count(s) - pos;
922 int bits2= show>>(24-len);
924 print_bin(bits2, len);
926 av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d vlc @%5d in %s %s:%d\n", bits2, len, r, pos, file, func, line);
929 static inline int get_xbits_trace(GetBitContext *s, int n, char *file, const char *func, int line){
930 int show= show_bits(s, n);
931 int r= get_xbits(s, n);
934 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);
938 #define get_bits(s, n) get_bits_trace(s, n, __FILE__, __PRETTY_FUNCTION__, __LINE__)
939 #define get_bits1(s) get_bits_trace(s, 1, __FILE__, __PRETTY_FUNCTION__, __LINE__)
940 #define get_xbits(s, n) get_xbits_trace(s, n, __FILE__, __PRETTY_FUNCTION__, __LINE__)
941 #define get_vlc(s, vlc) get_vlc_trace(s, (vlc)->table, (vlc)->bits, 3, __FILE__, __PRETTY_FUNCTION__, __LINE__)
942 #define get_vlc2(s, tab, bits, max) get_vlc_trace(s, tab, bits, max, __FILE__, __PRETTY_FUNCTION__, __LINE__)
944 #define tprintf(p, ...) av_log(p, AV_LOG_DEBUG, __VA_ARGS__)
947 #define tprintf(p, ...) {}
950 static inline int decode012(GetBitContext *gb){
956 return get_bits1(gb) + 1;
959 static inline int decode210(GetBitContext *gb){
963 return 2 - get_bits1(gb);
966 #endif /* AVCODEC_BITSTREAM_H */