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.
36 #if defined(ALT_BITSTREAM_READER_LE) && !defined(ALT_BITSTREAM_READER)
37 #define ALT_BITSTREAM_READER
40 //#define ALT_BITSTREAM_WRITER
41 //#define ALIGNED_BITSTREAM_WRITER
42 #if !defined(LIBMPEG2_BITSTREAM_READER) && !defined(A32_BITSTREAM_READER) && !defined(ALT_BITSTREAM_READER)
44 # define A32_BITSTREAM_READER
46 #define ALT_BITSTREAM_READER
47 //#define LIBMPEG2_BITSTREAM_READER
48 //#define A32_BITSTREAM_READER
51 #define LIBMPEG2_BITSTREAM_READER_HACK //add BERO
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, char *s, int put_zero);
140 void ff_copy_bits(PutBitContext *pb, 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 missaligned 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 static inline int unaligned32_be(const void *v)
413 return (((p[0]<<8) | p[1])<<16) | (p[2]<<8) | (p[3]);
415 return be2me_32( unaligned32(v)); //original
419 static inline int unaligned32_le(const void *v)
423 return (((p[3]<<8) | p[2])<<16) | (p[1]<<8) | (p[0]);
425 return le2me_32( unaligned32(v)); //original
429 #ifdef ALT_BITSTREAM_READER
430 # define MIN_CACHE_BITS 25
432 # define OPEN_READER(name, gb)\
433 int name##_index= (gb)->index;\
434 int name##_cache= 0;\
436 # define CLOSE_READER(name, gb)\
437 (gb)->index= name##_index;\
439 # ifdef ALT_BITSTREAM_READER_LE
440 # define UPDATE_CACHE(name, gb)\
441 name##_cache= unaligned32_le( ((const uint8_t *)(gb)->buffer)+(name##_index>>3) ) >> (name##_index&0x07);\
443 # define SKIP_CACHE(name, gb, num)\
444 name##_cache >>= (num);
446 # define UPDATE_CACHE(name, gb)\
447 name##_cache= unaligned32_be( ((const uint8_t *)(gb)->buffer)+(name##_index>>3) ) << (name##_index&0x07);\
449 # define SKIP_CACHE(name, gb, num)\
450 name##_cache <<= (num);
454 # define SKIP_COUNTER(name, gb, num)\
455 name##_index += (num);\
457 # define SKIP_BITS(name, gb, num)\
459 SKIP_CACHE(name, gb, num)\
460 SKIP_COUNTER(name, gb, num)\
463 # define LAST_SKIP_BITS(name, gb, num) SKIP_COUNTER(name, gb, num)
464 # define LAST_SKIP_CACHE(name, gb, num) ;
466 # ifdef ALT_BITSTREAM_READER_LE
467 # define SHOW_UBITS(name, gb, num)\
468 ((name##_cache) & (NEG_USR32(0xffffffff,num)))
470 # define SHOW_SBITS(name, gb, num)\
471 NEG_SSR32((name##_cache)<<(32-(num)), num)
473 # define SHOW_UBITS(name, gb, num)\
474 NEG_USR32(name##_cache, num)
476 # define SHOW_SBITS(name, gb, num)\
477 NEG_SSR32(name##_cache, num)
480 # define GET_CACHE(name, gb)\
481 ((uint32_t)name##_cache)
483 static inline int get_bits_count(GetBitContext *s){
487 static inline void skip_bits_long(GetBitContext *s, int n){
491 #elif defined LIBMPEG2_BITSTREAM_READER
492 //libmpeg2 like reader
494 # define MIN_CACHE_BITS 17
496 # define OPEN_READER(name, gb)\
497 int name##_bit_count=(gb)->bit_count;\
498 int name##_cache= (gb)->cache;\
499 uint8_t * name##_buffer_ptr=(gb)->buffer_ptr;\
501 # define CLOSE_READER(name, gb)\
502 (gb)->bit_count= name##_bit_count;\
503 (gb)->cache= name##_cache;\
504 (gb)->buffer_ptr= name##_buffer_ptr;\
506 #ifdef LIBMPEG2_BITSTREAM_READER_HACK
508 # define UPDATE_CACHE(name, gb)\
509 if(name##_bit_count >= 0){\
510 name##_cache+= (int)be2me_16(*(uint16_t*)name##_buffer_ptr) << name##_bit_count;\
511 name##_buffer_ptr += 2;\
512 name##_bit_count-= 16;\
517 # define UPDATE_CACHE(name, gb)\
518 if(name##_bit_count >= 0){\
519 name##_cache+= ((name##_buffer_ptr[0]<<8) + name##_buffer_ptr[1]) << name##_bit_count;\
520 name##_buffer_ptr+=2;\
521 name##_bit_count-= 16;\
526 # define SKIP_CACHE(name, gb, num)\
527 name##_cache <<= (num);\
529 # define SKIP_COUNTER(name, gb, num)\
530 name##_bit_count += (num);\
532 # define SKIP_BITS(name, gb, num)\
534 SKIP_CACHE(name, gb, num)\
535 SKIP_COUNTER(name, gb, num)\
538 # define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num)
539 # define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num)
541 # define SHOW_UBITS(name, gb, num)\
542 NEG_USR32(name##_cache, num)
544 # define SHOW_SBITS(name, gb, num)\
545 NEG_SSR32(name##_cache, num)
547 # define GET_CACHE(name, gb)\
548 ((uint32_t)name##_cache)
550 static inline int get_bits_count(GetBitContext *s){
551 return (s->buffer_ptr - s->buffer)*8 - 16 + s->bit_count;
554 static inline void skip_bits_long(GetBitContext *s, int n){
557 re_buffer_ptr += 2*(re_bit_count>>4);
559 re_cache = ((re_buffer_ptr[-2]<<8) + re_buffer_ptr[-1]) << (16+re_bit_count);
564 #elif defined A32_BITSTREAM_READER
566 # define MIN_CACHE_BITS 32
568 # define OPEN_READER(name, gb)\
569 int name##_bit_count=(gb)->bit_count;\
570 uint32_t name##_cache0= (gb)->cache0;\
571 uint32_t name##_cache1= (gb)->cache1;\
572 uint32_t * name##_buffer_ptr=(gb)->buffer_ptr;\
574 # define CLOSE_READER(name, gb)\
575 (gb)->bit_count= name##_bit_count;\
576 (gb)->cache0= name##_cache0;\
577 (gb)->cache1= name##_cache1;\
578 (gb)->buffer_ptr= name##_buffer_ptr;\
580 # define UPDATE_CACHE(name, gb)\
581 if(name##_bit_count > 0){\
582 const uint32_t next= be2me_32( *name##_buffer_ptr );\
583 name##_cache0 |= NEG_USR32(next,name##_bit_count);\
584 name##_cache1 |= next<<name##_bit_count;\
585 name##_buffer_ptr++;\
586 name##_bit_count-= 32;\
589 #if defined(ARCH_X86)
590 # define SKIP_CACHE(name, gb, num)\
592 "shldl %2, %1, %0 \n\t"\
594 : "+r" (name##_cache0), "+r" (name##_cache1)\
595 : "Ic" ((uint8_t)(num))\
598 # define SKIP_CACHE(name, gb, num)\
599 name##_cache0 <<= (num);\
600 name##_cache0 |= NEG_USR32(name##_cache1,num);\
601 name##_cache1 <<= (num);
604 # define SKIP_COUNTER(name, gb, num)\
605 name##_bit_count += (num);\
607 # define SKIP_BITS(name, gb, num)\
609 SKIP_CACHE(name, gb, num)\
610 SKIP_COUNTER(name, gb, num)\
613 # define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num)
614 # define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num)
616 # define SHOW_UBITS(name, gb, num)\
617 NEG_USR32(name##_cache0, num)
619 # define SHOW_SBITS(name, gb, num)\
620 NEG_SSR32(name##_cache0, num)
622 # define GET_CACHE(name, gb)\
625 static inline int get_bits_count(GetBitContext *s){
626 return ((uint8_t*)s->buffer_ptr - s->buffer)*8 - 32 + s->bit_count;
629 static inline void skip_bits_long(GetBitContext *s, int n){
632 re_buffer_ptr += re_bit_count>>5;
634 re_cache0 = be2me_32( re_buffer_ptr[-1] ) << re_bit_count;
643 * read mpeg1 dc style vlc (sign bit + mantisse with no MSB).
644 * if MSB not set it is negative
645 * @param n length in bits
648 static inline int get_xbits(GetBitContext *s, int n){
650 register int32_t cache;
653 cache = GET_CACHE(re,s);
655 LAST_SKIP_BITS(re, s, n)
657 return (NEG_USR32(sign ^ cache, n) ^ sign) - sign;
660 static inline int get_sbits(GetBitContext *s, int n){
664 tmp= SHOW_SBITS(re, s, n);
665 LAST_SKIP_BITS(re, s, n)
672 * Note, the alt bitstream reader can read up to 25 bits, but the libmpeg2 reader can't
674 static inline unsigned int get_bits(GetBitContext *s, int n){
678 tmp= SHOW_UBITS(re, s, n);
679 LAST_SKIP_BITS(re, s, n)
686 * Note, the alt bitstream reader can read up to 25 bits, but the libmpeg2 reader can't
688 static inline unsigned int show_bits(GetBitContext *s, int n){
692 tmp= SHOW_UBITS(re, s, n);
693 // CLOSE_READER(re, s)
697 static inline void skip_bits(GetBitContext *s, int n){
698 //Note gcc seems to optimize this to s->index+=n for the ALT_READER :))
701 LAST_SKIP_BITS(re, s, n)
705 static inline unsigned int get_bits1(GetBitContext *s){
706 #ifdef ALT_BITSTREAM_READER
708 uint8_t result= s->buffer[ index>>3 ];
709 #ifdef ALT_BITSTREAM_READER_LE
710 result>>= (index&0x07);
713 result<<= (index&0x07);
721 return get_bits(s, 1);
725 static inline unsigned int show_bits1(GetBitContext *s){
726 return show_bits(s, 1);
729 static inline void skip_bits1(GetBitContext *s){
736 static inline unsigned int get_bits_long(GetBitContext *s, int n){
737 if(n<=17) return get_bits(s, n);
739 #ifdef ALT_BITSTREAM_READER_LE
740 int ret= get_bits(s, 16);
741 return ret | (get_bits(s, n-16) << 16);
743 int ret= get_bits(s, 16) << (n-16);
744 return ret | get_bits(s, n-16);
752 static inline unsigned int show_bits_long(GetBitContext *s, int n){
753 if(n<=17) return show_bits(s, n);
755 GetBitContext gb= *s;
756 int ret= get_bits_long(s, n);
762 static inline int check_marker(GetBitContext *s, const char *msg)
764 int bit= get_bits1(s);
766 av_log(NULL, AV_LOG_INFO, "Marker bit missing %s\n", msg);
772 * init GetBitContext.
773 * @param buffer bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE bytes larger then the actual read bits
774 * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
775 * @param bit_size the size of the buffer in bits
777 static inline void init_get_bits(GetBitContext *s,
778 const uint8_t *buffer, int bit_size)
780 int buffer_size= (bit_size+7)>>3;
781 if(buffer_size < 0 || bit_size < 0) {
782 buffer_size = bit_size = 0;
787 s->size_in_bits= bit_size;
788 s->buffer_end= buffer + buffer_size;
789 #ifdef ALT_BITSTREAM_READER
791 #elif defined LIBMPEG2_BITSTREAM_READER
792 s->buffer_ptr = (uint8_t*)((intptr_t)buffer&(~1));
793 s->bit_count = 16 + 8*((intptr_t)buffer&1);
794 skip_bits_long(s, 0);
795 #elif defined A32_BITSTREAM_READER
796 s->buffer_ptr = (uint32_t*)((intptr_t)buffer&(~3));
797 s->bit_count = 32 + 8*((intptr_t)buffer&3);
798 skip_bits_long(s, 0);
802 static inline void align_get_bits(GetBitContext *s)
804 int n= (-get_bits_count(s)) & 7;
805 if(n) skip_bits(s, n);
808 #define init_vlc(vlc, nb_bits, nb_codes,\
809 bits, bits_wrap, bits_size,\
810 codes, codes_wrap, codes_size,\
812 init_vlc_sparse(vlc, nb_bits, nb_codes,\
813 bits, bits_wrap, bits_size,\
814 codes, codes_wrap, codes_size,\
817 int init_vlc_sparse(VLC *vlc, int nb_bits, int nb_codes,
818 const void *bits, int bits_wrap, int bits_size,
819 const void *codes, int codes_wrap, int codes_size,
820 const void *symbols, int symbols_wrap, int symbols_size,
822 #define INIT_VLC_USE_STATIC 1
823 #define INIT_VLC_LE 2
824 void free_vlc(VLC *vlc);
828 * if the vlc code is invalid and max_depth=1 than no bits will be removed
829 * if the vlc code is invalid and max_depth>1 than the number of bits removed
832 #define GET_VLC(code, name, gb, table, bits, max_depth)\
834 int n, index, nb_bits;\
836 index= SHOW_UBITS(name, gb, bits);\
837 code = table[index][0];\
838 n = table[index][1];\
840 if(max_depth > 1 && n < 0){\
841 LAST_SKIP_BITS(name, gb, bits)\
842 UPDATE_CACHE(name, gb)\
846 index= SHOW_UBITS(name, gb, nb_bits) + code;\
847 code = table[index][0];\
848 n = table[index][1];\
849 if(max_depth > 2 && n < 0){\
850 LAST_SKIP_BITS(name, gb, nb_bits)\
851 UPDATE_CACHE(name, gb)\
855 index= SHOW_UBITS(name, gb, nb_bits) + code;\
856 code = table[index][0];\
857 n = table[index][1];\
860 SKIP_BITS(name, gb, n)\
863 #define GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update)\
865 int n, index, nb_bits;\
867 index= SHOW_UBITS(name, gb, bits);\
868 level = table[index].level;\
869 n = table[index].len;\
871 if(max_depth > 1 && n < 0){\
872 SKIP_BITS(name, gb, bits)\
874 UPDATE_CACHE(name, gb)\
879 index= SHOW_UBITS(name, gb, nb_bits) + level;\
880 level = table[index].level;\
881 n = table[index].len;\
883 run= table[index].run;\
884 SKIP_BITS(name, gb, n)\
889 * parses a vlc code, faster then get_vlc()
890 * @param bits is the number of bits which will be read at once, must be
891 * identical to nb_bits in init_vlc()
892 * @param max_depth is the number of times bits bits must be read to completely
893 * read the longest vlc code
894 * = (max_vlc_length + bits - 1) / bits
896 static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE (*table)[2],
897 int bits, int max_depth)
904 GET_VLC(code, re, s, table, bits, max_depth)
913 static inline void print_bin(int bits, int n){
916 for(i=n-1; i>=0; i--){
917 av_log(NULL, AV_LOG_DEBUG, "%d", (bits>>i)&1);
920 av_log(NULL, AV_LOG_DEBUG, " ");
923 static inline int get_bits_trace(GetBitContext *s, int n, char *file, const char *func, int line){
924 int r= get_bits(s, n);
927 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);
930 static inline int get_vlc_trace(GetBitContext *s, VLC_TYPE (*table)[2], int bits, int max_depth, char *file, const char *func, int line){
931 int show= show_bits(s, 24);
932 int pos= get_bits_count(s);
933 int r= get_vlc2(s, table, bits, max_depth);
934 int len= get_bits_count(s) - pos;
935 int bits2= show>>(24-len);
937 print_bin(bits2, len);
939 av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d vlc @%5d in %s %s:%d\n", bits2, len, r, pos, file, func, line);
942 static inline int get_xbits_trace(GetBitContext *s, int n, char *file, const char *func, int line){
943 int show= show_bits(s, n);
944 int r= get_xbits(s, n);
947 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);
951 #define get_bits(s, n) get_bits_trace(s, n, __FILE__, __PRETTY_FUNCTION__, __LINE__)
952 #define get_bits1(s) get_bits_trace(s, 1, __FILE__, __PRETTY_FUNCTION__, __LINE__)
953 #define get_xbits(s, n) get_xbits_trace(s, n, __FILE__, __PRETTY_FUNCTION__, __LINE__)
954 #define get_vlc(s, vlc) get_vlc_trace(s, (vlc)->table, (vlc)->bits, 3, __FILE__, __PRETTY_FUNCTION__, __LINE__)
955 #define get_vlc2(s, tab, bits, max) get_vlc_trace(s, tab, bits, max, __FILE__, __PRETTY_FUNCTION__, __LINE__)
957 #define tprintf(p, ...) av_log(p, AV_LOG_DEBUG, __VA_ARGS__)
960 #define tprintf(p, ...) {}
963 static inline int decode012(GetBitContext *gb){
969 return get_bits1(gb) + 1;
972 #endif /* BITSTREAM_H */