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);
142 /* buffer, buffer_end and size_in_bits must be present and used by every reader */
143 typedef struct GetBitContext {
144 const uint8_t *buffer, *buffer_end;
145 #ifdef ALT_BITSTREAM_READER
147 #elif defined LIBMPEG2_BITSTREAM_READER
151 #elif defined A32_BITSTREAM_READER
152 uint32_t *buffer_ptr;
160 #define VLC_TYPE int16_t
164 VLC_TYPE (*table)[2]; ///< code, bits
165 int table_size, table_allocated;
168 typedef struct RL_VLC_ELEM {
174 #if defined(ARCH_SPARC) || defined(ARCH_ARMV4L) || defined(ARCH_MIPS) || defined(ARCH_BFIN)
175 #define UNALIGNED_STORES_ARE_BAD
178 /* used to avoid missaligned exceptions on some archs (alpha, ...) */
179 #if defined(ARCH_X86)
180 # define unaligned16(a) (*(const uint16_t*)(a))
181 # define unaligned32(a) (*(const uint32_t*)(a))
182 # define unaligned64(a) (*(const uint64_t*)(a))
185 # define unaligned(x) \
186 static inline uint##x##_t unaligned##x(const void *v) { \
189 } __attribute__((packed)); \
191 return ((const struct Unaligned *) v)->i; \
193 # elif defined(__DECC)
194 # define unaligned(x) \
195 static inline uint##x##_t unaligned##x(const void *v) { \
196 return *(const __unaligned uint##x##_t *) v; \
199 # define unaligned(x) \
200 static inline uint##x##_t unaligned##x(const void *v) { \
201 return *(const uint##x##_t *) v; \
208 #endif /* defined(ARCH_X86) */
210 #ifndef ALT_BITSTREAM_WRITER
211 static inline void put_bits(PutBitContext *s, int n, unsigned int value)
213 unsigned int bit_buf;
216 // printf("put_bits=%d %x\n", n, value);
217 assert(n == 32 || value < (1U << n));
219 bit_buf = s->bit_buf;
220 bit_left = s->bit_left;
222 // printf("n=%d value=%x cnt=%d buf=%x\n", n, value, bit_cnt, bit_buf);
225 bit_buf = (bit_buf<<n) | value;
229 bit_buf |= value >> (n - bit_left);
230 #ifdef UNALIGNED_STORES_ARE_BAD
231 if (3 & (intptr_t) s->buf_ptr) {
232 s->buf_ptr[0] = bit_buf >> 24;
233 s->buf_ptr[1] = bit_buf >> 16;
234 s->buf_ptr[2] = bit_buf >> 8;
235 s->buf_ptr[3] = bit_buf ;
238 *(uint32_t *)s->buf_ptr = be2me_32(bit_buf);
239 //printf("bitbuf = %08x\n", bit_buf);
245 s->bit_buf = bit_buf;
246 s->bit_left = bit_left;
251 #ifdef ALT_BITSTREAM_WRITER
252 static inline void put_bits(PutBitContext *s, int n, unsigned int value)
254 # ifdef ALIGNED_BITSTREAM_WRITER
255 # if defined(ARCH_X86)
257 "movl %0, %%ecx \n\t"
258 "xorl %%eax, %%eax \n\t"
259 "shrdl %%cl, %1, %%eax \n\t"
261 "movl %0, %%ecx \n\t"
262 "shrl $3, %%ecx \n\t"
263 "andl $0xFFFFFFFC, %%ecx \n\t"
265 "orl %1, (%2, %%ecx) \n\t"
268 "movl %%eax, 4(%2, %%ecx) \n\t"
269 : "=&r" (s->index), "=&r" (value)
270 : "r" (s->buf), "r" (n), "0" (s->index), "1" (value<<(-n))
275 uint32_t *ptr= ((uint32_t *)s->buf)+(index>>5);
279 ptr[0] |= be2me_32(value>>(index&31));
280 ptr[1] = be2me_32(value<<(32-(index&31)));
281 //if(n>24) printf("%d %d\n", n, value);
285 # else //ALIGNED_BITSTREAM_WRITER
286 # if defined(ARCH_X86)
288 "movl $7, %%ecx \n\t"
289 "andl %0, %%ecx \n\t"
290 "addl %3, %%ecx \n\t"
294 "movl %0, %%ecx \n\t"
295 "shrl $3, %%ecx \n\t"
296 "orl %1, (%%ecx, %2) \n\t"
298 "movl $0, 4(%%ecx, %2) \n\t"
299 : "=&r" (s->index), "=&r" (value)
300 : "r" (s->buf), "r" (n), "0" (s->index), "1" (value)
305 uint32_t *ptr= (uint32_t*)(((uint8_t *)s->buf)+(index>>3));
307 ptr[0] |= be2me_32(value<<(32-n-(index&7) ));
309 //if(n>24) printf("%d %d\n", n, value);
313 # endif //!ALIGNED_BITSTREAM_WRITER
318 static inline uint8_t* pbBufPtr(PutBitContext *s)
320 #ifdef ALT_BITSTREAM_WRITER
321 return s->buf + (s->index>>3);
329 * PutBitContext must be flushed & aligned to a byte boundary before calling this.
331 static inline void skip_put_bytes(PutBitContext *s, int n){
332 assert((put_bits_count(s)&7)==0);
333 #ifdef ALT_BITSTREAM_WRITER
334 FIXME may need some cleaning of the buffer
337 assert(s->bit_left==32);
343 * Skips the given number of bits.
344 * Must only be used if the actual values in the bitstream do not matter.
346 static inline void skip_put_bits(PutBitContext *s, int n){
347 #ifdef ALT_BITSTREAM_WRITER
351 s->buf_ptr-= s->bit_left>>5;
357 * Changes the end of the buffer.
359 static inline void set_put_bits_buffer_size(PutBitContext *s, int size){
360 s->buf_end= s->buf + size;
363 /* Bitstream reader API docs:
365 abritary name which is used as prefix for the internal variables
370 OPEN_READER(name, gb)
371 loads gb into local variables
373 CLOSE_READER(name, gb)
374 stores local vars in gb
376 UPDATE_CACHE(name, gb)
377 refills the internal cache from the bitstream
378 after this call at least MIN_CACHE_BITS will be available,
381 will output the contents of the internal cache, next bit is MSB of 32 or 64 bit (FIXME 64bit)
383 SHOW_UBITS(name, gb, num)
384 will return the next num bits
386 SHOW_SBITS(name, gb, num)
387 will return the next num bits and do sign extension
389 SKIP_BITS(name, gb, num)
390 will skip over the next num bits
391 note, this is equivalent to SKIP_CACHE; SKIP_COUNTER
393 SKIP_CACHE(name, gb, num)
394 will remove the next num bits from the cache (note SKIP_COUNTER MUST be called before UPDATE_CACHE / CLOSE_READER)
396 SKIP_COUNTER(name, gb, num)
397 will increment the internal bit counter (see SKIP_CACHE & SKIP_BITS)
399 LAST_SKIP_CACHE(name, gb, num)
400 will remove the next num bits from the cache if it is needed for UPDATE_CACHE otherwise it will do nothing
402 LAST_SKIP_BITS(name, gb, num)
403 is equivalent to SKIP_LAST_CACHE; SKIP_COUNTER
405 for examples see get_bits, show_bits, skip_bits, get_vlc
408 static inline int unaligned32_be(const void *v)
412 return (((p[0]<<8) | p[1])<<16) | (p[2]<<8) | (p[3]);
414 return be2me_32( unaligned32(v)); //original
418 static inline int unaligned32_le(const void *v)
422 return (((p[3]<<8) | p[2])<<16) | (p[1]<<8) | (p[0]);
424 return le2me_32( unaligned32(v)); //original
428 #ifdef ALT_BITSTREAM_READER
429 # define MIN_CACHE_BITS 25
431 # define OPEN_READER(name, gb)\
432 int name##_index= (gb)->index;\
433 int name##_cache= 0;\
435 # define CLOSE_READER(name, gb)\
436 (gb)->index= name##_index;\
438 # ifdef ALT_BITSTREAM_READER_LE
439 # define UPDATE_CACHE(name, gb)\
440 name##_cache= unaligned32_le( ((const uint8_t *)(gb)->buffer)+(name##_index>>3) ) >> (name##_index&0x07);\
442 # define SKIP_CACHE(name, gb, num)\
443 name##_cache >>= (num);
445 # define UPDATE_CACHE(name, gb)\
446 name##_cache= unaligned32_be( ((const uint8_t *)(gb)->buffer)+(name##_index>>3) ) << (name##_index&0x07);\
448 # define SKIP_CACHE(name, gb, num)\
449 name##_cache <<= (num);
453 # define SKIP_COUNTER(name, gb, num)\
454 name##_index += (num);\
456 # define SKIP_BITS(name, gb, num)\
458 SKIP_CACHE(name, gb, num)\
459 SKIP_COUNTER(name, gb, num)\
462 # define LAST_SKIP_BITS(name, gb, num) SKIP_COUNTER(name, gb, num)
463 # define LAST_SKIP_CACHE(name, gb, num) ;
465 # ifdef ALT_BITSTREAM_READER_LE
466 # define SHOW_UBITS(name, gb, num)\
467 ((name##_cache) & (NEG_USR32(0xffffffff,num)))
469 # define SHOW_SBITS(name, gb, num)\
470 NEG_SSR32((name##_cache)<<(32-(num)), num)
472 # define SHOW_UBITS(name, gb, num)\
473 NEG_USR32(name##_cache, num)
475 # define SHOW_SBITS(name, gb, num)\
476 NEG_SSR32(name##_cache, num)
479 # define GET_CACHE(name, gb)\
480 ((uint32_t)name##_cache)
482 static inline int get_bits_count(GetBitContext *s){
486 static inline void skip_bits_long(GetBitContext *s, int n){
490 #elif defined LIBMPEG2_BITSTREAM_READER
491 //libmpeg2 like reader
493 # define MIN_CACHE_BITS 17
495 # define OPEN_READER(name, gb)\
496 int name##_bit_count=(gb)->bit_count;\
497 int name##_cache= (gb)->cache;\
498 uint8_t * name##_buffer_ptr=(gb)->buffer_ptr;\
500 # define CLOSE_READER(name, gb)\
501 (gb)->bit_count= name##_bit_count;\
502 (gb)->cache= name##_cache;\
503 (gb)->buffer_ptr= name##_buffer_ptr;\
505 #ifdef LIBMPEG2_BITSTREAM_READER_HACK
507 # define UPDATE_CACHE(name, gb)\
508 if(name##_bit_count >= 0){\
509 name##_cache+= (int)be2me_16(*(uint16_t*)name##_buffer_ptr) << name##_bit_count;\
510 name##_buffer_ptr += 2;\
511 name##_bit_count-= 16;\
516 # define UPDATE_CACHE(name, gb)\
517 if(name##_bit_count >= 0){\
518 name##_cache+= ((name##_buffer_ptr[0]<<8) + name##_buffer_ptr[1]) << name##_bit_count;\
519 name##_buffer_ptr+=2;\
520 name##_bit_count-= 16;\
525 # define SKIP_CACHE(name, gb, num)\
526 name##_cache <<= (num);\
528 # define SKIP_COUNTER(name, gb, num)\
529 name##_bit_count += (num);\
531 # define SKIP_BITS(name, gb, num)\
533 SKIP_CACHE(name, gb, num)\
534 SKIP_COUNTER(name, gb, num)\
537 # define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num)
538 # define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num)
540 # define SHOW_UBITS(name, gb, num)\
541 NEG_USR32(name##_cache, num)
543 # define SHOW_SBITS(name, gb, num)\
544 NEG_SSR32(name##_cache, num)
546 # define GET_CACHE(name, gb)\
547 ((uint32_t)name##_cache)
549 static inline int get_bits_count(GetBitContext *s){
550 return (s->buffer_ptr - s->buffer)*8 - 16 + s->bit_count;
553 static inline void skip_bits_long(GetBitContext *s, int n){
556 re_buffer_ptr += 2*(re_bit_count>>4);
558 re_cache = ((re_buffer_ptr[-2]<<8) + re_buffer_ptr[-1]) << (16+re_bit_count);
563 #elif defined A32_BITSTREAM_READER
565 # define MIN_CACHE_BITS 32
567 # define OPEN_READER(name, gb)\
568 int name##_bit_count=(gb)->bit_count;\
569 uint32_t name##_cache0= (gb)->cache0;\
570 uint32_t name##_cache1= (gb)->cache1;\
571 uint32_t * name##_buffer_ptr=(gb)->buffer_ptr;\
573 # define CLOSE_READER(name, gb)\
574 (gb)->bit_count= name##_bit_count;\
575 (gb)->cache0= name##_cache0;\
576 (gb)->cache1= name##_cache1;\
577 (gb)->buffer_ptr= name##_buffer_ptr;\
579 # define UPDATE_CACHE(name, gb)\
580 if(name##_bit_count > 0){\
581 const uint32_t next= be2me_32( *name##_buffer_ptr );\
582 name##_cache0 |= NEG_USR32(next,name##_bit_count);\
583 name##_cache1 |= next<<name##_bit_count;\
584 name##_buffer_ptr++;\
585 name##_bit_count-= 32;\
588 #if defined(ARCH_X86)
589 # define SKIP_CACHE(name, gb, num)\
591 "shldl %2, %1, %0 \n\t"\
593 : "+r" (name##_cache0), "+r" (name##_cache1)\
594 : "Ic" ((uint8_t)(num))\
597 # define SKIP_CACHE(name, gb, num)\
598 name##_cache0 <<= (num);\
599 name##_cache0 |= NEG_USR32(name##_cache1,num);\
600 name##_cache1 <<= (num);
603 # define SKIP_COUNTER(name, gb, num)\
604 name##_bit_count += (num);\
606 # define SKIP_BITS(name, gb, num)\
608 SKIP_CACHE(name, gb, num)\
609 SKIP_COUNTER(name, gb, num)\
612 # define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num)
613 # define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num)
615 # define SHOW_UBITS(name, gb, num)\
616 NEG_USR32(name##_cache0, num)
618 # define SHOW_SBITS(name, gb, num)\
619 NEG_SSR32(name##_cache0, num)
621 # define GET_CACHE(name, gb)\
624 static inline int get_bits_count(GetBitContext *s){
625 return ((uint8_t*)s->buffer_ptr - s->buffer)*8 - 32 + s->bit_count;
628 static inline void skip_bits_long(GetBitContext *s, int n){
631 re_buffer_ptr += re_bit_count>>5;
633 re_cache0 = be2me_32( re_buffer_ptr[-1] ) << re_bit_count;
642 * read mpeg1 dc style vlc (sign bit + mantisse with no MSB).
643 * if MSB not set it is negative
644 * @param n length in bits
647 static inline int get_xbits(GetBitContext *s, int n){
649 register int32_t cache;
652 cache = GET_CACHE(re,s);
654 LAST_SKIP_BITS(re, s, n)
656 return (NEG_USR32(sign ^ cache, n) ^ sign) - sign;
659 static inline int get_sbits(GetBitContext *s, int n){
663 tmp= SHOW_SBITS(re, s, n);
664 LAST_SKIP_BITS(re, s, n)
671 * Note, the alt bitstream reader can read up to 25 bits, but the libmpeg2 reader can't
673 static inline unsigned int get_bits(GetBitContext *s, int n){
677 tmp= SHOW_UBITS(re, s, n);
678 LAST_SKIP_BITS(re, s, n)
685 * Note, the alt bitstream reader can read up to 25 bits, but the libmpeg2 reader can't
687 static inline unsigned int show_bits(GetBitContext *s, int n){
691 tmp= SHOW_UBITS(re, s, n);
692 // CLOSE_READER(re, s)
696 static inline void skip_bits(GetBitContext *s, int n){
697 //Note gcc seems to optimize this to s->index+=n for the ALT_READER :))
700 LAST_SKIP_BITS(re, s, n)
704 static inline unsigned int get_bits1(GetBitContext *s){
705 #ifdef ALT_BITSTREAM_READER
707 uint8_t result= s->buffer[ index>>3 ];
708 #ifdef ALT_BITSTREAM_READER_LE
709 result>>= (index&0x07);
712 result<<= (index&0x07);
720 return get_bits(s, 1);
724 static inline unsigned int show_bits1(GetBitContext *s){
725 return show_bits(s, 1);
728 static inline void skip_bits1(GetBitContext *s){
735 static inline unsigned int get_bits_long(GetBitContext *s, int n){
736 if(n<=17) return get_bits(s, n);
738 #ifdef ALT_BITSTREAM_READER_LE
739 int ret= get_bits(s, 16);
740 return ret | (get_bits(s, n-16) << 16);
742 int ret= get_bits(s, 16) << (n-16);
743 return ret | get_bits(s, n-16);
751 static inline unsigned int show_bits_long(GetBitContext *s, int n){
752 if(n<=17) return show_bits(s, n);
754 GetBitContext gb= *s;
755 int ret= get_bits_long(s, n);
761 static inline int check_marker(GetBitContext *s, const char *msg)
763 int bit= get_bits1(s);
765 av_log(NULL, AV_LOG_INFO, "Marker bit missing %s\n", msg);
771 * init GetBitContext.
772 * @param buffer bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE bytes larger then the actual read bits
773 * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
774 * @param bit_size the size of the buffer in bits
776 static inline void init_get_bits(GetBitContext *s,
777 const uint8_t *buffer, int bit_size)
779 int buffer_size= (bit_size+7)>>3;
780 if(buffer_size < 0 || bit_size < 0) {
781 buffer_size = bit_size = 0;
786 s->size_in_bits= bit_size;
787 s->buffer_end= buffer + buffer_size;
788 #ifdef ALT_BITSTREAM_READER
790 #elif defined LIBMPEG2_BITSTREAM_READER
791 s->buffer_ptr = (uint8_t*)((intptr_t)buffer&(~1));
792 s->bit_count = 16 + 8*((intptr_t)buffer&1);
793 skip_bits_long(s, 0);
794 #elif defined A32_BITSTREAM_READER
795 s->buffer_ptr = (uint32_t*)((intptr_t)buffer&(~3));
796 s->bit_count = 32 + 8*((intptr_t)buffer&3);
797 skip_bits_long(s, 0);
801 static inline void align_get_bits(GetBitContext *s)
803 int n= (-get_bits_count(s)) & 7;
804 if(n) skip_bits(s, n);
807 #define init_vlc(vlc, nb_bits, nb_codes,\
808 bits, bits_wrap, bits_size,\
809 codes, codes_wrap, codes_size,\
811 init_vlc_sparse(vlc, nb_bits, nb_codes,\
812 bits, bits_wrap, bits_size,\
813 codes, codes_wrap, codes_size,\
816 int init_vlc_sparse(VLC *vlc, int nb_bits, int nb_codes,
817 const void *bits, int bits_wrap, int bits_size,
818 const void *codes, int codes_wrap, int codes_size,
819 const void *symbols, int symbols_wrap, int symbols_size,
821 #define INIT_VLC_USE_STATIC 1
822 #define INIT_VLC_LE 2
823 void free_vlc(VLC *vlc);
827 * if the vlc code is invalid and max_depth=1 than no bits will be removed
828 * if the vlc code is invalid and max_depth>1 than the number of bits removed
831 #define GET_VLC(code, name, gb, table, bits, max_depth)\
833 int n, index, nb_bits;\
835 index= SHOW_UBITS(name, gb, bits);\
836 code = table[index][0];\
837 n = table[index][1];\
839 if(max_depth > 1 && n < 0){\
840 LAST_SKIP_BITS(name, gb, 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];\
848 if(max_depth > 2 && n < 0){\
849 LAST_SKIP_BITS(name, gb, nb_bits)\
850 UPDATE_CACHE(name, gb)\
854 index= SHOW_UBITS(name, gb, nb_bits) + code;\
855 code = table[index][0];\
856 n = table[index][1];\
859 SKIP_BITS(name, gb, n)\
862 #define GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update)\
864 int n, index, nb_bits;\
866 index= SHOW_UBITS(name, gb, bits);\
867 level = table[index].level;\
868 n = table[index].len;\
870 if(max_depth > 1 && n < 0){\
871 SKIP_BITS(name, gb, bits)\
873 UPDATE_CACHE(name, gb)\
878 index= SHOW_UBITS(name, gb, nb_bits) + level;\
879 level = table[index].level;\
880 n = table[index].len;\
882 run= table[index].run;\
883 SKIP_BITS(name, gb, n)\
888 * parses a vlc code, faster then get_vlc()
889 * @param bits is the number of bits which will be read at once, must be
890 * identical to nb_bits in init_vlc()
891 * @param max_depth is the number of times bits bits must be read to completely
892 * read the longest vlc code
893 * = (max_vlc_length + bits - 1) / bits
895 static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE (*table)[2],
896 int bits, int max_depth)
903 GET_VLC(code, re, s, table, bits, max_depth)
912 static inline void print_bin(int bits, int n){
915 for(i=n-1; i>=0; i--){
916 av_log(NULL, AV_LOG_DEBUG, "%d", (bits>>i)&1);
919 av_log(NULL, AV_LOG_DEBUG, " ");
922 static inline int get_bits_trace(GetBitContext *s, int n, char *file, const char *func, int line){
923 int r= get_bits(s, n);
926 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);
929 static inline int get_vlc_trace(GetBitContext *s, VLC_TYPE (*table)[2], int bits, int max_depth, char *file, const char *func, int line){
930 int show= show_bits(s, 24);
931 int pos= get_bits_count(s);
932 int r= get_vlc2(s, table, bits, max_depth);
933 int len= get_bits_count(s) - pos;
934 int bits2= show>>(24-len);
936 print_bin(bits2, len);
938 av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d vlc @%5d in %s %s:%d\n", bits2, len, r, pos, file, func, line);
941 static inline int get_xbits_trace(GetBitContext *s, int n, char *file, const char *func, int line){
942 int show= show_bits(s, n);
943 int r= get_xbits(s, n);
946 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);
950 #define get_bits(s, n) get_bits_trace(s, n, __FILE__, __PRETTY_FUNCTION__, __LINE__)
951 #define get_bits1(s) get_bits_trace(s, 1, __FILE__, __PRETTY_FUNCTION__, __LINE__)
952 #define get_xbits(s, n) get_xbits_trace(s, n, __FILE__, __PRETTY_FUNCTION__, __LINE__)
953 #define get_vlc(s, vlc) get_vlc_trace(s, (vlc)->table, (vlc)->bits, 3, __FILE__, __PRETTY_FUNCTION__, __LINE__)
954 #define get_vlc2(s, tab, bits, max) get_vlc_trace(s, tab, bits, max, __FILE__, __PRETTY_FUNCTION__, __LINE__)
956 #define tprintf(p, ...) av_log(p, AV_LOG_DEBUG, __VA_ARGS__)
959 #define tprintf(p, ...) {}
962 static inline int decode012(GetBitContext *gb){
968 return get_bits1(gb) + 1;
971 #endif /* BITSTREAM_H */