this include isn;t longer need and now generate a lot of warnings patch by Bohdan...
[libav.git] / libavcodec / common.h
1 #ifndef COMMON_H
2 #define COMMON_H
3
4 #define FFMPEG_VERSION_INT 0x000406
5 #define FFMPEG_VERSION "0.4.6"
6
7 #if defined(WIN32) && !defined(__MINGW32__) && !defined(__CYGWIN__)
8 #define CONFIG_WIN32
9 #endif
10
11 //#define ALT_BITSTREAM_WRITER
12 //#define ALIGNED_BITSTREAM_WRITER
13
14 #define ALT_BITSTREAM_READER
15 //#define LIBMPEG2_BITSTREAM_READER
16 //#define A32_BITSTREAM_READER
17
18 #ifdef HAVE_AV_CONFIG_H
19 /* only include the following when compiling package */
20 #include "config.h"
21
22 #include <stdlib.h>
23 #include <stdio.h>
24 #include <string.h>
25 #ifndef __BEOS__
26 #include <errno.h>
27 #else
28 #include "berrno.h"
29 #endif
30 #include <math.h>
31
32 #ifndef ENODATA
33 #define ENODATA 61
34 #endif
35
36 #endif /* HAVE_AV_CONFIG_H */
37
38 /* Suppress restrict if it was not defined in config.h. */
39 #ifndef restrict
40 #define restrict
41 #endif
42
43 #if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
44 #define always_inline __attribute__((always_inline)) inline
45 #else
46 #define always_inline inline
47 #endif
48
49 #ifdef CONFIG_WIN32
50
51 /* windows */
52
53 typedef unsigned short UINT16;
54 typedef signed short INT16;
55 typedef unsigned char UINT8;
56 typedef unsigned int UINT32;
57 typedef unsigned __int64 UINT64;
58 typedef signed char INT8;
59 typedef signed int INT32;
60 typedef signed __int64 INT64;
61
62 typedef UINT8 uint8_t;
63 typedef INT8 int8_t;
64 typedef UINT16 uint16_t;
65 typedef INT16 int16_t;
66 typedef UINT32 uint32_t;
67 typedef INT32 int32_t;
68 typedef UINT64 uint64_t;
69 typedef INT64 int64_t;
70
71 #ifndef __MINGW32__
72 #define INT64_C(c) (c ## i64)
73 #define UINT64_C(c) (c ## i64)
74
75 #define inline __inline
76
77 #else
78 #define INT64_C(c) (c ## LL)
79 #define UINT64_C(c) (c ## ULL)
80 #endif /* __MINGW32__ */
81
82 #define M_PI 3.14159265358979323846
83 #define M_SQRT2 1.41421356237309504880 /* sqrt(2) */
84
85 #ifdef _DEBUG
86 #define DEBUG
87 #endif
88
89 #define snprintf _snprintf
90
91 #else /* CONFIG_WIN32 */
92
93 /* unix */
94
95 #include <inttypes.h>
96
97 #ifndef __WINE_WINDEF16_H
98 /* workaround for typedef conflict in MPlayer (wine typedefs) */
99 typedef unsigned short UINT16;
100 typedef signed short INT16;
101 #endif
102
103 typedef unsigned char UINT8;
104 typedef unsigned int UINT32;
105 typedef unsigned long long UINT64;
106 typedef signed char INT8;
107 typedef signed int INT32;
108 typedef signed long long INT64;
109
110 #ifdef HAVE_AV_CONFIG_H
111
112 #ifndef INT64_C
113 #define INT64_C(c) (c ## LL)
114 #define UINT64_C(c) (c ## ULL)
115 #endif
116
117 #ifdef USE_FASTMEMCPY
118 #include "fastmemcpy.h"
119 #endif
120
121 #endif /* HAVE_AV_CONFIG_H */
122
123 #endif /* !CONFIG_WIN32 */
124
125 #ifdef HAVE_AV_CONFIG_H
126
127 #include "bswap.h"
128
129 #if defined(__MINGW32__) || defined(__CYGWIN__) || \
130 defined(__OS2__) || defined (__OpenBSD__)
131 #define MANGLE(a) "_" #a
132 #else
133 #define MANGLE(a) #a
134 #endif
135
136 /* debug stuff */
137
138 #ifndef DEBUG
139 #define NDEBUG
140 #endif
141 #include <assert.h>
142
143 /* dprintf macros */
144 #if defined(CONFIG_WIN32) && !defined(__MINGW32__)
145
146 inline void dprintf(const char* fmt,...) {}
147
148 #else
149
150 #ifdef DEBUG
151 #define dprintf(fmt,args...) printf(fmt, ## args)
152 #else
153 #define dprintf(fmt,args...)
154 #endif
155
156 #endif /* !CONFIG_WIN32 */
157
158 #define av_abort() do { fprintf(stderr, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)
159
160 /* assume b>0 */
161 #define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
162 #define ABS(a) ((a) >= 0 ? (a) : (-(a)))
163 #define MAX(a,b) ((a) > (b) ? (a) : (b))
164 #define MIN(a,b) ((a) > (b) ? (b) : (a))
165
166 #ifdef ARCH_X86
167 // avoid +32 for shift optimization (gcc should do that ...)
168 static inline int32_t NEG_SSR32( int32_t a, int8_t s){
169 asm ("sarl %1, %0\n\t"
170 : "+r" (a)
171 : "ic" ((uint8_t)(-s))
172 );
173 return a;
174 }
175 static inline uint32_t NEG_USR32(uint32_t a, int8_t s){
176 asm ("shrl %1, %0\n\t"
177 : "+r" (a)
178 : "ic" ((uint8_t)(-s))
179 );
180 return a;
181 }
182 #else
183 #define NEG_SSR32(a,s) ((( int32_t)(a))>>(32-(s)))
184 #define NEG_USR32(a,s) (((uint32_t)(a))>>(32-(s)))
185 #endif
186
187 /* bit output */
188
189 struct PutBitContext;
190
191 typedef void (*WriteDataFunc)(void *, UINT8 *, int);
192
193 typedef struct PutBitContext {
194 #ifdef ALT_BITSTREAM_WRITER
195 UINT8 *buf, *buf_end;
196 int index;
197 #else
198 UINT32 bit_buf;
199 int bit_left;
200 UINT8 *buf, *buf_ptr, *buf_end;
201 #endif
202 INT64 data_out_size; /* in bytes */
203 } PutBitContext;
204
205 void init_put_bits(PutBitContext *s,
206 UINT8 *buffer, int buffer_size,
207 void *opaque,
208 void (*write_data)(void *, UINT8 *, int));
209
210 INT64 get_bit_count(PutBitContext *s); /* XXX: change function name */
211 void align_put_bits(PutBitContext *s);
212 void flush_put_bits(PutBitContext *s);
213 void put_string(PutBitContext * pbc, char *s);
214
215 /* jpeg specific put_bits */
216 void jflush_put_bits(PutBitContext *s);
217
218 /* bit input */
219
220 typedef struct GetBitContext {
221 UINT8 *buffer, *buffer_end;
222 #ifdef ALT_BITSTREAM_READER
223 int index;
224 #elif defined LIBMPEG2_BITSTREAM_READER
225 UINT8 *buffer_ptr;
226 UINT32 cache;
227 int bit_count;
228 #elif defined A32_BITSTREAM_READER
229 UINT32 *buffer_ptr;
230 UINT32 cache0;
231 UINT32 cache1;
232 int bit_count;
233 #endif
234 int size;
235 } GetBitContext;
236
237 static inline int get_bits_count(GetBitContext *s);
238
239 #define VLC_TYPE INT16
240
241 typedef struct VLC {
242 int bits;
243 VLC_TYPE (*table)[2]; // code, bits
244 int table_size, table_allocated;
245 } VLC;
246
247 typedef struct RL_VLC_ELEM {
248 int16_t level;
249 int8_t len;
250 uint8_t run;
251 } RL_VLC_ELEM;
252
253 /* used to avoid missaligned exceptions on some archs (alpha, ...) */
254 #ifdef ARCH_X86
255 #define unaligned32(a) (*(UINT32*)(a))
256 #else
257 #ifdef __GNUC__
258 static inline uint32_t unaligned32(const void *v) {
259 struct Unaligned {
260 uint32_t i;
261 } __attribute__((packed));
262
263 return ((const struct Unaligned *) v)->i;
264 }
265 #elif defined(__DECC)
266 static inline uint32_t unaligned32(const void *v) {
267 return *(const __unaligned uint32_t *) v;
268 }
269 #else
270 static inline uint32_t unaligned32(const void *v) {
271 return *(const uint32_t *) v;
272 }
273 #endif
274 #endif //!ARCH_X86
275
276 #ifndef ALT_BITSTREAM_WRITER
277 static inline void put_bits(PutBitContext *s, int n, unsigned int value)
278 {
279 unsigned int bit_buf;
280 int bit_left;
281
282 #ifdef STATS
283 st_out_bit_counts[st_current_index] += n;
284 #endif
285 // printf("put_bits=%d %x\n", n, value);
286 assert(n == 32 || value < (1U << n));
287
288 bit_buf = s->bit_buf;
289 bit_left = s->bit_left;
290
291 // printf("n=%d value=%x cnt=%d buf=%x\n", n, value, bit_cnt, bit_buf);
292 /* XXX: optimize */
293 if (n < bit_left) {
294 bit_buf = (bit_buf<<n) | value;
295 bit_left-=n;
296 } else {
297 bit_buf<<=bit_left;
298 bit_buf |= value >> (n - bit_left);
299 *(UINT32 *)s->buf_ptr = be2me_32(bit_buf);
300 //printf("bitbuf = %08x\n", bit_buf);
301 s->buf_ptr+=4;
302 bit_left+=32 - n;
303 bit_buf = value;
304 }
305
306 s->bit_buf = bit_buf;
307 s->bit_left = bit_left;
308 }
309 #endif
310
311
312 #ifdef ALT_BITSTREAM_WRITER
313 static inline void put_bits(PutBitContext *s, int n, unsigned int value)
314 {
315 #ifdef ALIGNED_BITSTREAM_WRITER
316 #ifdef ARCH_X86
317 asm volatile(
318 "movl %0, %%ecx \n\t"
319 "xorl %%eax, %%eax \n\t"
320 "shrdl %%cl, %1, %%eax \n\t"
321 "shrl %%cl, %1 \n\t"
322 "movl %0, %%ecx \n\t"
323 "shrl $3, %%ecx \n\t"
324 "andl $0xFFFFFFFC, %%ecx \n\t"
325 "bswapl %1 \n\t"
326 "orl %1, (%2, %%ecx) \n\t"
327 "bswapl %%eax \n\t"
328 "addl %3, %0 \n\t"
329 "movl %%eax, 4(%2, %%ecx) \n\t"
330 : "=&r" (s->index), "=&r" (value)
331 : "r" (s->buf), "r" (n), "0" (s->index), "1" (value<<(-n))
332 : "%eax", "%ecx"
333 );
334 #else
335 int index= s->index;
336 uint32_t *ptr= ((uint32_t *)s->buf)+(index>>5);
337
338 value<<= 32-n;
339
340 ptr[0] |= be2me_32(value>>(index&31));
341 ptr[1] = be2me_32(value<<(32-(index&31)));
342 //if(n>24) printf("%d %d\n", n, value);
343 index+= n;
344 s->index= index;
345 #endif
346 #else //ALIGNED_BITSTREAM_WRITER
347 #ifdef ARCH_X86
348 asm volatile(
349 "movl $7, %%ecx \n\t"
350 "andl %0, %%ecx \n\t"
351 "addl %3, %%ecx \n\t"
352 "negl %%ecx \n\t"
353 "shll %%cl, %1 \n\t"
354 "bswapl %1 \n\t"
355 "movl %0, %%ecx \n\t"
356 "shrl $3, %%ecx \n\t"
357 "orl %1, (%%ecx, %2) \n\t"
358 "addl %3, %0 \n\t"
359 "movl $0, 4(%%ecx, %2) \n\t"
360 : "=&r" (s->index), "=&r" (value)
361 : "r" (s->buf), "r" (n), "0" (s->index), "1" (value)
362 : "%ecx"
363 );
364 #else
365 int index= s->index;
366 uint32_t *ptr= (uint32_t*)(((uint8_t *)s->buf)+(index>>3));
367
368 ptr[0] |= be2me_32(value<<(32-n-(index&7) ));
369 ptr[1] = 0;
370 //if(n>24) printf("%d %d\n", n, value);
371 index+= n;
372 s->index= index;
373 #endif
374 #endif //!ALIGNED_BITSTREAM_WRITER
375 }
376 #endif
377
378 #ifndef ALT_BITSTREAM_WRITER
379 /* for jpeg : escape 0xff with 0x00 after it */
380 static inline void jput_bits(PutBitContext *s, int n, unsigned int value)
381 {
382 unsigned int bit_buf, b;
383 int bit_left, i;
384
385 assert(n == 32 || value < (1U << n));
386
387 bit_buf = s->bit_buf;
388 bit_left = s->bit_left;
389
390 //printf("n=%d value=%x cnt=%d buf=%x\n", n, value, bit_cnt, bit_buf);
391 /* XXX: optimize */
392 if (n < bit_left) {
393 bit_buf = (bit_buf<<n) | value;
394 bit_left-=n;
395 } else {
396 bit_buf<<=bit_left;
397 bit_buf |= value >> (n - bit_left);
398 /* handle escape */
399 for(i=0;i<4;i++) {
400 b = (bit_buf >> 24);
401 *(s->buf_ptr++) = b;
402 if (b == 0xff)
403 *(s->buf_ptr++) = 0;
404 bit_buf <<= 8;
405 }
406
407 bit_left+= 32 - n;
408 bit_buf = value;
409 }
410
411 s->bit_buf = bit_buf;
412 s->bit_left = bit_left;
413 }
414 #endif
415
416
417 #ifdef ALT_BITSTREAM_WRITER
418 static inline void jput_bits(PutBitContext *s, int n, int value)
419 {
420 int index= s->index;
421 uint32_t *ptr= (uint32_t*)(((uint8_t *)s->buf)+(index>>3));
422 int v= ptr[0];
423 //if(n>24) printf("%d %d\n", n, value);
424
425 v |= be2me_32(value<<(32-n-(index&7) ));
426 if(((v+0x01010101)^0xFFFFFFFF)&v&0x80808080)
427 {
428 /* handle idiotic (m)jpeg escapes */
429 uint8_t *bPtr= (uint8_t*)ptr;
430 int numChecked= ((index+n)>>3) - (index>>3);
431
432 v= be2me_32(v);
433
434 *(bPtr++)= v>>24;
435 if((v&0xFF000000)==0xFF000000 && numChecked>0){
436 *(bPtr++)= 0x00;
437 index+=8;
438 }
439 *(bPtr++)= (v>>16)&0xFF;
440 if((v&0x00FF0000)==0x00FF0000 && numChecked>1){
441 *(bPtr++)= 0x00;
442 index+=8;
443 }
444 *(bPtr++)= (v>>8)&0xFF;
445 if((v&0x0000FF00)==0x0000FF00 && numChecked>2){
446 *(bPtr++)= 0x00;
447 index+=8;
448 }
449 *(bPtr++)= v&0xFF;
450 if((v&0x000000FF)==0x000000FF && numChecked>3){
451 *(bPtr++)= 0x00;
452 index+=8;
453 }
454 *((uint32_t*)bPtr)= 0;
455 }
456 else
457 {
458 ptr[0] = v;
459 ptr[1] = 0;
460 }
461
462 index+= n;
463 s->index= index;
464 }
465 #endif
466
467 static inline uint8_t* pbBufPtr(PutBitContext *s)
468 {
469 #ifdef ALT_BITSTREAM_WRITER
470 return s->buf + (s->index>>3);
471 #else
472 return s->buf_ptr;
473 #endif
474 }
475
476 /* Bitstream reader API docs:
477 name
478 abritary name which is used as prefix for the internal variables
479
480 gb
481 getbitcontext
482
483 OPEN_READER(name, gb)
484 loads gb into local variables
485
486 CLOSE_READER(name, gb)
487 stores local vars in gb
488
489 UPDATE_CACHE(name, gb)
490 refills the internal cache from the bitstream
491 after this call at least MIN_CACHE_BITS will be available,
492
493 GET_CACHE(name, gb)
494 will output the contents of the internal cache, next bit is MSB of 32 or 64 bit (FIXME 64bit)
495
496 SHOW_UBITS(name, gb, num)
497 will return the nest num bits
498
499 SHOW_SBITS(name, gb, num)
500 will return the nest num bits and do sign extension
501
502 SKIP_BITS(name, gb, num)
503 will skip over the next num bits
504 note, this is equinvalent to SKIP_CACHE; SKIP_COUNTER
505
506 SKIP_CACHE(name, gb, num)
507 will remove the next num bits from the cache (note SKIP_COUNTER MUST be called before UPDATE_CACHE / CLOSE_READER)
508
509 SKIP_COUNTER(name, gb, num)
510 will increment the internal bit counter (see SKIP_CACHE & SKIP_BITS)
511
512 LAST_SKIP_CACHE(name, gb, num)
513 will remove the next num bits from the cache if it is needed for UPDATE_CACHE otherwise it will do nothing
514
515 LAST_SKIP_BITS(name, gb, num)
516 is equinvalent to SKIP_LAST_CACHE; SKIP_COUNTER
517
518 for examples see get_bits, show_bits, skip_bits, get_vlc
519 */
520
521 #ifdef ALT_BITSTREAM_READER
522 # define MIN_CACHE_BITS 25
523
524 # define OPEN_READER(name, gb)\
525 int name##_index= (gb)->index;\
526 int name##_cache= 0;\
527
528 # define CLOSE_READER(name, gb)\
529 (gb)->index= name##_index;\
530
531 # define UPDATE_CACHE(name, gb)\
532 name##_cache= be2me_32( unaligned32( ((uint8_t *)(gb)->buffer)+(name##_index>>3) ) ) << (name##_index&0x07);\
533
534 # define SKIP_CACHE(name, gb, num)\
535 name##_cache <<= (num);\
536
537 // FIXME name?
538 # define SKIP_COUNTER(name, gb, num)\
539 name##_index += (num);\
540
541 # define SKIP_BITS(name, gb, num)\
542 {\
543 SKIP_CACHE(name, gb, num)\
544 SKIP_COUNTER(name, gb, num)\
545 }\
546
547 # define LAST_SKIP_BITS(name, gb, num) SKIP_COUNTER(name, gb, num)
548 # define LAST_SKIP_CACHE(name, gb, num) ;
549
550 # define SHOW_UBITS(name, gb, num)\
551 NEG_USR32(name##_cache, num)
552
553 # define SHOW_SBITS(name, gb, num)\
554 NEG_SSR32(name##_cache, num)
555
556 # define GET_CACHE(name, gb)\
557 ((uint32_t)name##_cache)
558
559 static inline int get_bits_count(GetBitContext *s){
560 return s->index;
561 }
562 #elif defined LIBMPEG2_BITSTREAM_READER
563 //libmpeg2 like reader
564
565 # define MIN_CACHE_BITS 16
566
567 # define OPEN_READER(name, gb)\
568 int name##_bit_count=(gb)->bit_count;\
569 int name##_cache= (gb)->cache;\
570 uint8_t * name##_buffer_ptr=(gb)->buffer_ptr;\
571
572 # define CLOSE_READER(name, gb)\
573 (gb)->bit_count= name##_bit_count;\
574 (gb)->cache= name##_cache;\
575 (gb)->buffer_ptr= name##_buffer_ptr;\
576
577 # define UPDATE_CACHE(name, gb)\
578 if(name##_bit_count > 0){\
579 name##_cache+= ((name##_buffer_ptr[0]<<8) + name##_buffer_ptr[1]) << name##_bit_count;\
580 name##_buffer_ptr+=2;\
581 name##_bit_count-= 16;\
582 }\
583
584 # define SKIP_CACHE(name, gb, num)\
585 name##_cache <<= (num);\
586
587 # define SKIP_COUNTER(name, gb, num)\
588 name##_bit_count += (num);\
589
590 # define SKIP_BITS(name, gb, num)\
591 {\
592 SKIP_CACHE(name, gb, num)\
593 SKIP_COUNTER(name, gb, num)\
594 }\
595
596 # define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num)
597 # define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num)
598
599 # define SHOW_UBITS(name, gb, num)\
600 NEG_USR32(name##_cache, num)
601
602 # define SHOW_SBITS(name, gb, num)\
603 NEG_SSR32(name##_cache, num)
604
605 # define GET_CACHE(name, gb)\
606 ((uint32_t)name##_cache)
607
608 static inline int get_bits_count(GetBitContext *s){
609 return (s->buffer_ptr - s->buffer)*8 - 16 + s->bit_count;
610 }
611
612 #elif defined A32_BITSTREAM_READER
613
614 # define MIN_CACHE_BITS 32
615
616 # define OPEN_READER(name, gb)\
617 int name##_bit_count=(gb)->bit_count;\
618 uint32_t name##_cache0= (gb)->cache0;\
619 uint32_t name##_cache1= (gb)->cache1;\
620 uint32_t * name##_buffer_ptr=(gb)->buffer_ptr;\
621
622 # define CLOSE_READER(name, gb)\
623 (gb)->bit_count= name##_bit_count;\
624 (gb)->cache0= name##_cache0;\
625 (gb)->cache1= name##_cache1;\
626 (gb)->buffer_ptr= name##_buffer_ptr;\
627
628 # define UPDATE_CACHE(name, gb)\
629 if(name##_bit_count > 0){\
630 const uint32_t next= be2me_32( *name##_buffer_ptr );\
631 name##_cache0 |= NEG_USR32(next,name##_bit_count);\
632 name##_cache1 |= next<<name##_bit_count;\
633 name##_buffer_ptr++;\
634 name##_bit_count-= 32;\
635 }\
636
637 #ifdef ARCH_X86
638 # define SKIP_CACHE(name, gb, num)\
639 asm(\
640 "shldl %2, %1, %0 \n\t"\
641 "shll %2, %1 \n\t"\
642 : "+r" (name##_cache0), "+r" (name##_cache1)\
643 : "Ic" ((uint8_t)num)\
644 );
645 #else
646 # define SKIP_CACHE(name, gb, num)\
647 name##_cache0 <<= (num);\
648 name##_cache0 |= NEG_USR32(name##_cache1,num);\
649 name##_cache1 <<= (num);
650 #endif
651
652 # define SKIP_COUNTER(name, gb, num)\
653 name##_bit_count += (num);\
654
655 # define SKIP_BITS(name, gb, num)\
656 {\
657 SKIP_CACHE(name, gb, num)\
658 SKIP_COUNTER(name, gb, num)\
659 }\
660
661 # define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num)
662 # define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num)
663
664 # define SHOW_UBITS(name, gb, num)\
665 NEG_USR32(name##_cache0, num)
666
667 # define SHOW_SBITS(name, gb, num)\
668 NEG_SSR32(name##_cache0, num)
669
670 # define GET_CACHE(name, gb)\
671 (name##_cache0)
672
673 static inline int get_bits_count(GetBitContext *s){
674 return ((uint8_t*)s->buffer_ptr - s->buffer)*8 - 32 + s->bit_count;
675 }
676
677 #endif
678
679 static inline unsigned int get_bits(GetBitContext *s, int n){
680 register int tmp;
681 OPEN_READER(re, s)
682 UPDATE_CACHE(re, s)
683 tmp= SHOW_UBITS(re, s, n);
684 LAST_SKIP_BITS(re, s, n)
685 CLOSE_READER(re, s)
686 return tmp;
687 }
688
689 static inline unsigned int show_bits(GetBitContext *s, int n){
690 register int tmp;
691 OPEN_READER(re, s)
692 UPDATE_CACHE(re, s)
693 tmp= SHOW_UBITS(re, s, n);
694 // CLOSE_READER(re, s)
695 return tmp;
696 }
697
698 static inline void skip_bits(GetBitContext *s, int n){
699 //Note gcc seems to optimize this to s->index+=n for the ALT_READER :))
700 OPEN_READER(re, s)
701 UPDATE_CACHE(re, s)
702 LAST_SKIP_BITS(re, s, n)
703 CLOSE_READER(re, s)
704 }
705
706 static inline unsigned int get_bits1(GetBitContext *s){
707 #ifdef ALT_BITSTREAM_READER
708 int index= s->index;
709 uint8_t result= s->buffer[ index>>3 ];
710 result<<= (index&0x07);
711 result>>= 8 - 1;
712 index++;
713 s->index= index;
714
715 return result;
716 #else
717 return get_bits(s, 1);
718 #endif
719 }
720
721 static inline unsigned int show_bits1(GetBitContext *s){
722 return show_bits(s, 1);
723 }
724
725 static inline void skip_bits1(GetBitContext *s){
726 skip_bits(s, 1);
727 }
728
729 void init_get_bits(GetBitContext *s,
730 UINT8 *buffer, int buffer_size);
731
732 int check_marker(GetBitContext *s, char *msg);
733 void align_get_bits(GetBitContext *s);
734 int init_vlc(VLC *vlc, int nb_bits, int nb_codes,
735 const void *bits, int bits_wrap, int bits_size,
736 const void *codes, int codes_wrap, int codes_size);
737 void free_vlc(VLC *vlc);
738
739 #define GET_VLC(code, name, gb, table, bits, max_depth)\
740 {\
741 int n, index, nb_bits;\
742 \
743 index= SHOW_UBITS(name, gb, bits);\
744 code = table[index][0];\
745 n = table[index][1];\
746 \
747 if(max_depth > 1 && n < 0){\
748 LAST_SKIP_BITS(name, gb, bits)\
749 UPDATE_CACHE(name, gb)\
750 \
751 nb_bits = -n;\
752 \
753 index= SHOW_UBITS(name, gb, nb_bits) + code;\
754 code = table[index][0];\
755 n = table[index][1];\
756 if(max_depth > 2 && n < 0){\
757 LAST_SKIP_BITS(name, gb, nb_bits)\
758 UPDATE_CACHE(name, gb)\
759 \
760 nb_bits = -n;\
761 \
762 index= SHOW_UBITS(name, gb, nb_bits) + code;\
763 code = table[index][0];\
764 n = table[index][1];\
765 }\
766 }\
767 SKIP_BITS(name, gb, n)\
768 }
769
770 #define GET_RL_VLC(level, run, name, gb, table, bits, max_depth)\
771 {\
772 int n, index, nb_bits;\
773 \
774 index= SHOW_UBITS(name, gb, bits);\
775 level = table[index].level;\
776 n = table[index].len;\
777 \
778 if(max_depth > 1 && n < 0){\
779 LAST_SKIP_BITS(name, gb, bits)\
780 UPDATE_CACHE(name, gb)\
781 \
782 nb_bits = -n;\
783 \
784 index= SHOW_UBITS(name, gb, nb_bits) + level;\
785 level = table[index].level;\
786 n = table[index].len;\
787 }\
788 run= table[index].run;\
789 SKIP_BITS(name, gb, n)\
790 }
791
792 // deprecated, dont use get_vlc for new code, use get_vlc2 instead or use GET_VLC directly
793 static inline int get_vlc(GetBitContext *s, VLC *vlc)
794 {
795 int code;
796 VLC_TYPE (*table)[2]= vlc->table;
797
798 OPEN_READER(re, s)
799 UPDATE_CACHE(re, s)
800
801 GET_VLC(code, re, s, table, vlc->bits, 3)
802
803 CLOSE_READER(re, s)
804 return code;
805 }
806
807 static always_inline int get_vlc2(GetBitContext *s, VLC_TYPE (*table)[2],
808 int bits, int max_depth)
809 {
810 int code;
811
812 OPEN_READER(re, s)
813 UPDATE_CACHE(re, s)
814
815 GET_VLC(code, re, s, table, bits, max_depth)
816
817 CLOSE_READER(re, s)
818 return code;
819 }
820
821
822 /* define it to include statistics code (useful only for optimizing
823 codec efficiency */
824 //#define STATS
825
826 #ifdef STATS
827
828 enum {
829 ST_UNKNOWN,
830 ST_DC,
831 ST_INTRA_AC,
832 ST_INTER_AC,
833 ST_INTRA_MB,
834 ST_INTER_MB,
835 ST_MV,
836 ST_NB,
837 };
838
839 extern int st_current_index;
840 extern unsigned int st_bit_counts[ST_NB];
841 extern unsigned int st_out_bit_counts[ST_NB];
842
843 void print_stats(void);
844 #endif
845
846 /* misc math functions */
847
848 static inline int av_log2(unsigned int v)
849 {
850 int n;
851
852 n = 0;
853 if (v & 0xffff0000) {
854 v >>= 16;
855 n += 16;
856 }
857 if (v & 0xff00) {
858 v >>= 8;
859 n += 8;
860 }
861 if (v & 0xf0) {
862 v >>= 4;
863 n += 4;
864 }
865 if (v & 0xc) {
866 v >>= 2;
867 n += 2;
868 }
869 if (v & 0x2) {
870 n++;
871 }
872 return n;
873 }
874
875 /* median of 3 */
876 static inline int mid_pred(int a, int b, int c)
877 {
878 int vmin, vmax;
879 vmax = vmin = a;
880 if (b < vmin)
881 vmin = b;
882 else
883 vmax = b;
884
885 if (c < vmin)
886 vmin = c;
887 else if (c > vmax)
888 vmax = c;
889
890 return a + b + c - vmin - vmax;
891 }
892
893 static inline int clip(int a, int amin, int amax)
894 {
895 if (a < amin)
896 return amin;
897 else if (a > amax)
898 return amax;
899 else
900 return a;
901 }
902
903 /* math */
904 int ff_gcd(int a, int b);
905
906 static inline int ff_sqrt(int a)
907 {
908 int ret=0;
909 int s;
910 int ret_sq=0;
911
912 for(s=15; s>=0; s--){
913 int b= ret_sq + (1<<(s*2)) + (ret<<s)*2;
914 if(b<=a){
915 ret_sq=b;
916 ret+= 1<<s;
917 }
918 }
919 return ret;
920 }
921 #if __CPU__ >= 686 && !defined(RUNTIME_CPUDETECT)
922 #define COPY3_IF_LT(x,y,a,b,c,d)\
923 asm volatile (\
924 "cmpl %0, %3 \n\t"\
925 "cmovl %3, %0 \n\t"\
926 "cmovl %4, %1 \n\t"\
927 "cmovl %5, %2 \n\t"\
928 : "+r" (x), "+r" (a), "+r" (c)\
929 : "r" (y), "r" (b), "r" (d)\
930 );
931 #else
932 #define COPY3_IF_LT(x,y,a,b,c,d)\
933 if((y)<(x)){\
934 (x)=(y);\
935 (a)=(b);\
936 (c)=(d);\
937 }
938 #endif
939
940 #define CLAMP_TO_8BIT(d) ((d > 0xff) ? 0xff : (d < 0) ? 0 : d)
941
942 #endif /* HAVE_AV_CONFIG_H */
943
944 #endif /* COMMON_H */