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
23 * bitstream api header.
26 #ifndef FFMPEG_BITSTREAM_H
27 #define FFMPEG_BITSTREAM_H
32 #include "libavutil/bswap.h"
33 #include "libavutil/common.h"
34 #include "libavutil/intreadwrite.h"
35 #include "libavutil/log.h"
37 #if defined(ALT_BITSTREAM_READER_LE) && !defined(ALT_BITSTREAM_READER)
38 # define ALT_BITSTREAM_READER
41 //#define ALT_BITSTREAM_WRITER
42 //#define ALIGNED_BITSTREAM_WRITER
43 #if !defined(LIBMPEG2_BITSTREAM_READER) && !defined(A32_BITSTREAM_READER) && !defined(ALT_BITSTREAM_READER)
45 # define A32_BITSTREAM_READER
47 # define ALT_BITSTREAM_READER
48 //#define LIBMPEG2_BITSTREAM_READER
49 //#define A32_BITSTREAM_READER
53 extern const uint8_t ff_reverse[256];
56 // avoid +32 for shift optimization (gcc should do that ...)
57 static inline int32_t NEG_SSR32( int32_t a, int8_t s){
58 asm ("sarl %1, %0\n\t"
60 : "ic" ((uint8_t)(-s))
64 static inline uint32_t NEG_USR32(uint32_t a, int8_t s){
65 asm ("shrl %1, %0\n\t"
67 : "ic" ((uint8_t)(-s))
72 # define NEG_SSR32(a,s) ((( int32_t)(a))>>(32-(s)))
73 # define NEG_USR32(a,s) (((uint32_t)(a))>>(32-(s)))
78 /* buf and buf_end must be present and used by every alternative writer. */
79 typedef struct PutBitContext {
80 #ifdef ALT_BITSTREAM_WRITER
81 uint8_t *buf, *buf_end;
86 uint8_t *buf, *buf_ptr, *buf_end;
90 static inline void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
98 s->buf_end = s->buf + buffer_size;
99 #ifdef ALT_BITSTREAM_WRITER
101 ((uint32_t*)(s->buf))[0]=0;
102 // memset(buffer, 0, buffer_size);
110 /* return the number of bits output */
111 static inline int put_bits_count(PutBitContext *s)
113 #ifdef ALT_BITSTREAM_WRITER
116 return (s->buf_ptr - s->buf) * 8 + 32 - s->bit_left;
120 /* pad the end of the output stream with zeros */
121 static inline void flush_put_bits(PutBitContext *s)
123 #ifdef ALT_BITSTREAM_WRITER
126 s->bit_buf<<= s->bit_left;
127 while (s->bit_left < 32) {
128 /* XXX: should test end of buffer */
129 *s->buf_ptr++=s->bit_buf >> 24;
138 void align_put_bits(PutBitContext *s);
139 void ff_put_string(PutBitContext * pbc, const char *s, int put_zero);
140 void ff_copy_bits(PutBitContext *pb, const uint8_t *src, int length);
143 /* buffer, buffer_end and size_in_bits must be present and used by every reader */
144 typedef struct GetBitContext {
145 const uint8_t *buffer, *buffer_end;
146 #ifdef ALT_BITSTREAM_READER
148 #elif defined LIBMPEG2_BITSTREAM_READER
152 #elif defined A32_BITSTREAM_READER
153 uint32_t *buffer_ptr;
161 #define VLC_TYPE int16_t
165 VLC_TYPE (*table)[2]; ///< code, bits
166 int table_size, table_allocated;
169 typedef struct RL_VLC_ELEM {
175 #if defined(ARCH_SPARC) || defined(ARCH_ARMV4L) || defined(ARCH_MIPS) || defined(ARCH_BFIN)
176 #define UNALIGNED_STORES_ARE_BAD
179 /* used to avoid misaligned exceptions on some archs (alpha, ...) */
180 #if defined(ARCH_X86)
181 # define unaligned16(a) (*(const uint16_t*)(a))
182 # define unaligned32(a) (*(const uint32_t*)(a))
183 # define unaligned64(a) (*(const uint64_t*)(a))
186 # define unaligned(x) \
187 static inline uint##x##_t unaligned##x(const void *v) { \
190 } __attribute__((packed)); \
192 return ((const struct Unaligned *) v)->i; \
194 # elif defined(__DECC)
195 # define unaligned(x) \
196 static inline uint##x##_t unaligned##x(const void *v) { \
197 return *(const __unaligned uint##x##_t *) v; \
200 # define unaligned(x) \
201 static inline uint##x##_t unaligned##x(const void *v) { \
202 return *(const uint##x##_t *) v; \
209 #endif /* defined(ARCH_X86) */
211 #ifndef ALT_BITSTREAM_WRITER
212 static inline void put_bits(PutBitContext *s, int n, unsigned int value)
214 unsigned int bit_buf;
217 // printf("put_bits=%d %x\n", n, value);
218 assert(n == 32 || value < (1U << n));
220 bit_buf = s->bit_buf;
221 bit_left = s->bit_left;
223 // printf("n=%d value=%x cnt=%d buf=%x\n", n, value, bit_cnt, bit_buf);
226 bit_buf = (bit_buf<<n) | value;
230 bit_buf |= value >> (n - bit_left);
231 #ifdef UNALIGNED_STORES_ARE_BAD
232 if (3 & (intptr_t) s->buf_ptr) {
233 s->buf_ptr[0] = bit_buf >> 24;
234 s->buf_ptr[1] = bit_buf >> 16;
235 s->buf_ptr[2] = bit_buf >> 8;
236 s->buf_ptr[3] = bit_buf ;
239 *(uint32_t *)s->buf_ptr = be2me_32(bit_buf);
240 //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
256 # if defined(ARCH_X86)
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
287 # if defined(ARCH_X86)
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
319 static inline uint8_t* pbBufPtr(PutBitContext *s)
321 #ifdef ALT_BITSTREAM_WRITER
322 return s->buf + (s->index>>3);
330 * PutBitContext must be flushed & aligned to a byte boundary before calling this.
332 static inline void skip_put_bytes(PutBitContext *s, int n){
333 assert((put_bits_count(s)&7)==0);
334 #ifdef ALT_BITSTREAM_WRITER
335 FIXME may need some cleaning of the buffer
338 assert(s->bit_left==32);
344 * Skips the given number of bits.
345 * Must only be used if the actual values in the bitstream do not matter.
347 static inline void skip_put_bits(PutBitContext *s, int n){
348 #ifdef ALT_BITSTREAM_WRITER
352 s->buf_ptr-= s->bit_left>>5;
358 * Changes the end of the buffer.
360 static inline void set_put_bits_buffer_size(PutBitContext *s, int size){
361 s->buf_end= s->buf + size;
364 /* Bitstream reader API docs:
366 abritary name which is used as prefix for the internal variables
371 OPEN_READER(name, gb)
372 loads gb into local variables
374 CLOSE_READER(name, gb)
375 stores local vars in gb
377 UPDATE_CACHE(name, gb)
378 refills the internal cache from the bitstream
379 after this call at least MIN_CACHE_BITS will be available,
382 will output the contents of the internal cache, next bit is MSB of 32 or 64 bit (FIXME 64bit)
384 SHOW_UBITS(name, gb, num)
385 will return the next num bits
387 SHOW_SBITS(name, gb, num)
388 will return the next num bits and do sign extension
390 SKIP_BITS(name, gb, num)
391 will skip over the next num bits
392 note, this is equivalent to SKIP_CACHE; SKIP_COUNTER
394 SKIP_CACHE(name, gb, num)
395 will remove the next num bits from the cache (note SKIP_COUNTER MUST be called before UPDATE_CACHE / CLOSE_READER)
397 SKIP_COUNTER(name, gb, num)
398 will increment the internal bit counter (see SKIP_CACHE & SKIP_BITS)
400 LAST_SKIP_CACHE(name, gb, num)
401 will remove the next num bits from the cache if it is needed for UPDATE_CACHE otherwise it will do nothing
403 LAST_SKIP_BITS(name, gb, num)
404 is equivalent to SKIP_LAST_CACHE; SKIP_COUNTER
406 for examples see get_bits, show_bits, skip_bits, get_vlc
409 #ifdef ALT_BITSTREAM_READER
410 # define MIN_CACHE_BITS 25
412 # define OPEN_READER(name, gb)\
413 int name##_index= (gb)->index;\
414 int name##_cache= 0;\
416 # define CLOSE_READER(name, gb)\
417 (gb)->index= name##_index;\
419 # ifdef ALT_BITSTREAM_READER_LE
420 # define UPDATE_CACHE(name, gb)\
421 name##_cache= AV_RL32( ((const uint8_t *)(gb)->buffer)+(name##_index>>3) ) >> (name##_index&0x07);\
423 # define SKIP_CACHE(name, gb, num)\
424 name##_cache >>= (num);
426 # define UPDATE_CACHE(name, gb)\
427 name##_cache= AV_RB32( ((const uint8_t *)(gb)->buffer)+(name##_index>>3) ) << (name##_index&0x07);\
429 # define SKIP_CACHE(name, gb, num)\
430 name##_cache <<= (num);
434 # define SKIP_COUNTER(name, gb, num)\
435 name##_index += (num);\
437 # define SKIP_BITS(name, gb, num)\
439 SKIP_CACHE(name, gb, num)\
440 SKIP_COUNTER(name, gb, num)\
443 # define LAST_SKIP_BITS(name, gb, num) SKIP_COUNTER(name, gb, num)
444 # define LAST_SKIP_CACHE(name, gb, num) ;
446 # ifdef ALT_BITSTREAM_READER_LE
447 # define SHOW_UBITS(name, gb, num)\
448 ((name##_cache) & (NEG_USR32(0xffffffff,num)))
450 # define SHOW_SBITS(name, gb, num)\
451 NEG_SSR32((name##_cache)<<(32-(num)), num)
453 # define SHOW_UBITS(name, gb, num)\
454 NEG_USR32(name##_cache, num)
456 # define SHOW_SBITS(name, gb, num)\
457 NEG_SSR32(name##_cache, num)
460 # define GET_CACHE(name, gb)\
461 ((uint32_t)name##_cache)
463 static inline int get_bits_count(GetBitContext *s){
467 static inline void skip_bits_long(GetBitContext *s, int n){
471 #elif defined LIBMPEG2_BITSTREAM_READER
472 //libmpeg2 like reader
474 # define MIN_CACHE_BITS 17
476 # define OPEN_READER(name, gb)\
477 int name##_bit_count=(gb)->bit_count;\
478 int name##_cache= (gb)->cache;\
479 uint8_t * name##_buffer_ptr=(gb)->buffer_ptr;\
481 # define CLOSE_READER(name, gb)\
482 (gb)->bit_count= name##_bit_count;\
483 (gb)->cache= name##_cache;\
484 (gb)->buffer_ptr= name##_buffer_ptr;\
486 # define UPDATE_CACHE(name, gb)\
487 if(name##_bit_count >= 0){\
488 name##_cache+= AV_RB16(name##_buffer_ptr) << name##_bit_count; \
489 name##_buffer_ptr+=2;\
490 name##_bit_count-= 16;\
493 # define SKIP_CACHE(name, gb, num)\
494 name##_cache <<= (num);\
496 # define SKIP_COUNTER(name, gb, num)\
497 name##_bit_count += (num);\
499 # define SKIP_BITS(name, gb, num)\
501 SKIP_CACHE(name, gb, num)\
502 SKIP_COUNTER(name, gb, num)\
505 # define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num)
506 # define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num)
508 # define SHOW_UBITS(name, gb, num)\
509 NEG_USR32(name##_cache, num)
511 # define SHOW_SBITS(name, gb, num)\
512 NEG_SSR32(name##_cache, num)
514 # define GET_CACHE(name, gb)\
515 ((uint32_t)name##_cache)
517 static inline int get_bits_count(GetBitContext *s){
518 return (s->buffer_ptr - s->buffer)*8 - 16 + s->bit_count;
521 static inline void skip_bits_long(GetBitContext *s, int n){
524 re_buffer_ptr += 2*(re_bit_count>>4);
526 re_cache = ((re_buffer_ptr[-2]<<8) + re_buffer_ptr[-1]) << (16+re_bit_count);
531 #elif defined A32_BITSTREAM_READER
533 # define MIN_CACHE_BITS 32
535 # define OPEN_READER(name, gb)\
536 int name##_bit_count=(gb)->bit_count;\
537 uint32_t name##_cache0= (gb)->cache0;\
538 uint32_t name##_cache1= (gb)->cache1;\
539 uint32_t * name##_buffer_ptr=(gb)->buffer_ptr;\
541 # define CLOSE_READER(name, gb)\
542 (gb)->bit_count= name##_bit_count;\
543 (gb)->cache0= name##_cache0;\
544 (gb)->cache1= name##_cache1;\
545 (gb)->buffer_ptr= name##_buffer_ptr;\
547 # define UPDATE_CACHE(name, gb)\
548 if(name##_bit_count > 0){\
549 const uint32_t next= be2me_32( *name##_buffer_ptr );\
550 name##_cache0 |= NEG_USR32(next,name##_bit_count);\
551 name##_cache1 |= next<<name##_bit_count;\
552 name##_buffer_ptr++;\
553 name##_bit_count-= 32;\
556 #if defined(ARCH_X86)
557 # define SKIP_CACHE(name, gb, num)\
559 "shldl %2, %1, %0 \n\t"\
561 : "+r" (name##_cache0), "+r" (name##_cache1)\
562 : "Ic" ((uint8_t)(num))\
565 # define SKIP_CACHE(name, gb, num)\
566 name##_cache0 <<= (num);\
567 name##_cache0 |= NEG_USR32(name##_cache1,num);\
568 name##_cache1 <<= (num);
571 # define SKIP_COUNTER(name, gb, num)\
572 name##_bit_count += (num);\
574 # define SKIP_BITS(name, gb, num)\
576 SKIP_CACHE(name, gb, num)\
577 SKIP_COUNTER(name, gb, num)\
580 # define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num)
581 # define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num)
583 # define SHOW_UBITS(name, gb, num)\
584 NEG_USR32(name##_cache0, num)
586 # define SHOW_SBITS(name, gb, num)\
587 NEG_SSR32(name##_cache0, num)
589 # define GET_CACHE(name, gb)\
592 static inline int get_bits_count(GetBitContext *s){
593 return ((uint8_t*)s->buffer_ptr - s->buffer)*8 - 32 + s->bit_count;
596 static inline void skip_bits_long(GetBitContext *s, int n){
599 re_buffer_ptr += re_bit_count>>5;
601 re_cache0 = be2me_32( re_buffer_ptr[-1] ) << re_bit_count;
610 * read mpeg1 dc style vlc (sign bit + mantisse with no MSB).
611 * if MSB not set it is negative
612 * @param n length in bits
615 static inline int get_xbits(GetBitContext *s, int n){
617 register int32_t cache;
620 cache = GET_CACHE(re,s);
622 LAST_SKIP_BITS(re, s, n)
624 return (NEG_USR32(sign ^ cache, n) ^ sign) - sign;
627 static inline int get_sbits(GetBitContext *s, int n){
631 tmp= SHOW_SBITS(re, s, n);
632 LAST_SKIP_BITS(re, s, n)
639 * Note, the alt bitstream reader can read up to 25 bits, but the libmpeg2 reader can't
641 static inline unsigned int get_bits(GetBitContext *s, int n){
645 tmp= SHOW_UBITS(re, s, n);
646 LAST_SKIP_BITS(re, s, n)
653 * Note, the alt bitstream reader can read up to 25 bits, but the libmpeg2 reader can't
655 static inline unsigned int show_bits(GetBitContext *s, int n){
659 tmp= SHOW_UBITS(re, s, n);
660 // CLOSE_READER(re, s)
664 static inline void skip_bits(GetBitContext *s, int n){
665 //Note gcc seems to optimize this to s->index+=n for the ALT_READER :))
668 LAST_SKIP_BITS(re, s, n)
672 static inline unsigned int get_bits1(GetBitContext *s){
673 #ifdef ALT_BITSTREAM_READER
675 uint8_t result= s->buffer[ index>>3 ];
676 #ifdef ALT_BITSTREAM_READER_LE
677 result>>= (index&0x07);
680 result<<= (index&0x07);
688 return get_bits(s, 1);
692 static inline unsigned int show_bits1(GetBitContext *s){
693 return show_bits(s, 1);
696 static inline void skip_bits1(GetBitContext *s){
703 static inline unsigned int get_bits_long(GetBitContext *s, int n){
704 if(n<=17) return get_bits(s, n);
706 #ifdef ALT_BITSTREAM_READER_LE
707 int ret= get_bits(s, 16);
708 return ret | (get_bits(s, n-16) << 16);
710 int ret= get_bits(s, 16) << (n-16);
711 return ret | get_bits(s, n-16);
719 static inline unsigned int show_bits_long(GetBitContext *s, int n){
720 if(n<=17) return show_bits(s, n);
722 GetBitContext gb= *s;
723 int ret= get_bits_long(s, n);
729 static inline int check_marker(GetBitContext *s, const char *msg)
731 int bit= get_bits1(s);
733 av_log(NULL, AV_LOG_INFO, "Marker bit missing %s\n", msg);
739 * init GetBitContext.
740 * @param buffer bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE bytes larger then the actual read bits
741 * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
742 * @param bit_size the size of the buffer in bits
744 static inline void init_get_bits(GetBitContext *s,
745 const uint8_t *buffer, int bit_size)
747 int buffer_size= (bit_size+7)>>3;
748 if(buffer_size < 0 || bit_size < 0) {
749 buffer_size = bit_size = 0;
754 s->size_in_bits= bit_size;
755 s->buffer_end= buffer + buffer_size;
756 #ifdef ALT_BITSTREAM_READER
758 #elif defined LIBMPEG2_BITSTREAM_READER
759 s->buffer_ptr = (uint8_t*)((intptr_t)buffer&(~1));
760 s->bit_count = 16 + 8*((intptr_t)buffer&1);
761 skip_bits_long(s, 0);
762 #elif defined A32_BITSTREAM_READER
763 s->buffer_ptr = (uint32_t*)((intptr_t)buffer&(~3));
764 s->bit_count = 32 + 8*((intptr_t)buffer&3);
765 skip_bits_long(s, 0);
769 static inline void align_get_bits(GetBitContext *s)
771 int n= (-get_bits_count(s)) & 7;
772 if(n) skip_bits(s, n);
775 #define init_vlc(vlc, nb_bits, nb_codes,\
776 bits, bits_wrap, bits_size,\
777 codes, codes_wrap, codes_size,\
779 init_vlc_sparse(vlc, nb_bits, nb_codes,\
780 bits, bits_wrap, bits_size,\
781 codes, codes_wrap, codes_size,\
784 int init_vlc_sparse(VLC *vlc, int nb_bits, int nb_codes,
785 const void *bits, int bits_wrap, int bits_size,
786 const void *codes, int codes_wrap, int codes_size,
787 const void *symbols, int symbols_wrap, int symbols_size,
789 #define INIT_VLC_USE_STATIC 1 ///< VERY strongly deprecated and forbidden
790 #define INIT_VLC_LE 2
791 #define INIT_VLC_USE_NEW_STATIC 4
792 void free_vlc(VLC *vlc);
794 #define INIT_VLC_STATIC(vlc, bits, a,b,c,d,e,f,g, static_size)\
796 static VLC_TYPE table[static_size][2];\
797 (vlc)->table= table;\
798 (vlc)->table_allocated= static_size;\
799 init_vlc(vlc, bits, a,b,c,d,e,f,g, INIT_VLC_USE_NEW_STATIC);\
805 * if the vlc code is invalid and max_depth=1 than no bits will be removed
806 * if the vlc code is invalid and max_depth>1 than the number of bits removed
809 #define GET_VLC(code, name, gb, table, bits, max_depth)\
811 int n, index, nb_bits;\
813 index= SHOW_UBITS(name, gb, bits);\
814 code = table[index][0];\
815 n = table[index][1];\
817 if(max_depth > 1 && n < 0){\
818 LAST_SKIP_BITS(name, gb, bits)\
819 UPDATE_CACHE(name, gb)\
823 index= SHOW_UBITS(name, gb, nb_bits) + code;\
824 code = table[index][0];\
825 n = table[index][1];\
826 if(max_depth > 2 && n < 0){\
827 LAST_SKIP_BITS(name, gb, nb_bits)\
828 UPDATE_CACHE(name, gb)\
832 index= SHOW_UBITS(name, gb, nb_bits) + code;\
833 code = table[index][0];\
834 n = table[index][1];\
837 SKIP_BITS(name, gb, n)\
840 #define GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update)\
842 int n, index, nb_bits;\
844 index= SHOW_UBITS(name, gb, bits);\
845 level = table[index].level;\
846 n = table[index].len;\
848 if(max_depth > 1 && n < 0){\
849 SKIP_BITS(name, gb, bits)\
851 UPDATE_CACHE(name, gb)\
856 index= SHOW_UBITS(name, gb, nb_bits) + level;\
857 level = table[index].level;\
858 n = table[index].len;\
860 run= table[index].run;\
861 SKIP_BITS(name, gb, n)\
866 * parses a vlc code, faster then get_vlc()
867 * @param bits is the number of bits which will be read at once, must be
868 * identical to nb_bits in init_vlc()
869 * @param max_depth is the number of times bits bits must be read to completely
870 * read the longest vlc code
871 * = (max_vlc_length + bits - 1) / bits
873 static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE (*table)[2],
874 int bits, int max_depth)
881 GET_VLC(code, re, s, table, bits, max_depth)
890 static inline void print_bin(int bits, int n){
893 for(i=n-1; i>=0; i--){
894 av_log(NULL, AV_LOG_DEBUG, "%d", (bits>>i)&1);
897 av_log(NULL, AV_LOG_DEBUG, " ");
900 static inline int get_bits_trace(GetBitContext *s, int n, char *file, const char *func, int line){
901 int r= get_bits(s, n);
904 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);
907 static inline int get_vlc_trace(GetBitContext *s, VLC_TYPE (*table)[2], int bits, int max_depth, char *file, const char *func, int line){
908 int show= show_bits(s, 24);
909 int pos= get_bits_count(s);
910 int r= get_vlc2(s, table, bits, max_depth);
911 int len= get_bits_count(s) - pos;
912 int bits2= show>>(24-len);
914 print_bin(bits2, len);
916 av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d vlc @%5d in %s %s:%d\n", bits2, len, r, pos, file, func, line);
919 static inline int get_xbits_trace(GetBitContext *s, int n, char *file, const char *func, int line){
920 int show= show_bits(s, n);
921 int r= get_xbits(s, n);
924 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);
928 #define get_bits(s, n) get_bits_trace(s, n, __FILE__, __PRETTY_FUNCTION__, __LINE__)
929 #define get_bits1(s) get_bits_trace(s, 1, __FILE__, __PRETTY_FUNCTION__, __LINE__)
930 #define get_xbits(s, n) get_xbits_trace(s, n, __FILE__, __PRETTY_FUNCTION__, __LINE__)
931 #define get_vlc(s, vlc) get_vlc_trace(s, (vlc)->table, (vlc)->bits, 3, __FILE__, __PRETTY_FUNCTION__, __LINE__)
932 #define get_vlc2(s, tab, bits, max) get_vlc_trace(s, tab, bits, max, __FILE__, __PRETTY_FUNCTION__, __LINE__)
934 #define tprintf(p, ...) av_log(p, AV_LOG_DEBUG, __VA_ARGS__)
937 #define tprintf(p, ...) {}
940 static inline int decode012(GetBitContext *gb){
946 return get_bits1(gb) + 1;
949 static inline int decode210(GetBitContext *gb){
953 return 2 - get_bits1(gb);
956 #endif /* FFMPEG_BITSTREAM_H */