Tiny patch for OpenBSD by (Björn Sandell <biorn at dce dot chalmers dot se>)
[libav.git] / libavcodec / common.h
1 /**
2 * @file common.h
3 * common internal api header.
4 */
5
6 #ifndef COMMON_H
7 #define COMMON_H
8
9 #if defined(WIN32) && !defined(__MINGW32__) && !defined(__CYGWIN__)
10 # define CONFIG_WIN32
11 #endif
12
13 //#define ALT_BITSTREAM_WRITER
14 //#define ALIGNED_BITSTREAM_WRITER
15
16 #define ALT_BITSTREAM_READER
17 //#define LIBMPEG2_BITSTREAM_READER
18 //#define A32_BITSTREAM_READER
19
20 #ifdef HAVE_AV_CONFIG_H
21 /* only include the following when compiling package */
22 # include "config.h"
23
24 # include <stdlib.h>
25 # include <stdio.h>
26 # include <string.h>
27 # ifndef __BEOS__
28 # include <errno.h>
29 # else
30 # include "berrno.h"
31 # endif
32 # include <math.h>
33
34 # ifndef ENODATA
35 # define ENODATA 61
36 # endif
37
38 #ifndef M_PI
39 #define M_PI 3.14159265358979323846
40 #endif
41
42 #include <stddef.h>
43 #ifndef offsetof
44 # define offsetof(T,F) ((unsigned int)((char *)&((T *)0)->F))
45 #endif
46
47 #define AVOPTION_CODEC_BOOL(name, help, field) \
48 { name, help, offsetof(AVCodecContext, field), FF_OPT_TYPE_BOOL }
49 #define AVOPTION_CODEC_DOUBLE(name, help, field, minv, maxv, defval) \
50 { name, help, offsetof(AVCodecContext, field), FF_OPT_TYPE_DOUBLE, minv, maxv, defval }
51 #define AVOPTION_CODEC_FLAG(name, help, field, flag, defval) \
52 { name, help, offsetof(AVCodecContext, field), FF_OPT_TYPE_FLAG, flag, 0, defval }
53 #define AVOPTION_CODEC_INT(name, help, field, minv, maxv, defval) \
54 { name, help, offsetof(AVCodecContext, field), FF_OPT_TYPE_INT, minv, maxv, defval }
55 #define AVOPTION_CODEC_STRING(name, help, field, str, val) \
56 { name, help, offsetof(AVCodecContext, field), FF_OPT_TYPE_STRING, .defval = val, .defstr = str }
57 #define AVOPTION_CODEC_RCOVERRIDE(name, help, field) \
58 { name, help, offsetof(AVCodecContext, field), FF_OPT_TYPE_RCOVERRIDE, .defval = 0, .defstr = NULL }
59 #define AVOPTION_SUB(ptr) { .name = NULL, .help = (const char*)ptr }
60 #define AVOPTION_END() AVOPTION_SUB(NULL)
61
62 struct AVOption;
63 #ifdef HAVE_MMX
64 extern const struct AVOption avoptions_common[3 + 5];
65 #else
66 extern const struct AVOption avoptions_common[3];
67 #endif
68 extern const struct AVOption avoptions_workaround_bug[11];
69
70 #endif /* HAVE_AV_CONFIG_H */
71
72 /* Suppress restrict if it was not defined in config.h. */
73 #ifndef restrict
74 # define restrict
75 #endif
76
77 #if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
78 # define always_inline __attribute__((always_inline)) inline
79 #else
80 # define always_inline inline
81 #endif
82
83 #ifdef CONFIG_WIN32
84
85 /* windows */
86
87 typedef unsigned short uint16_t;
88 typedef signed short int16_t;
89 typedef unsigned char uint8_t;
90 typedef unsigned int uint32_t;
91 typedef unsigned __int64 uint64_t;
92 typedef signed char int8_t;
93 typedef signed int int32_t;
94 typedef signed __int64 int64_t;
95
96 # ifndef __MINGW32__
97 # define int64_t_C(c) (c ## i64)
98 # define uint64_t_C(c) (c ## i64)
99
100 # define inline __inline
101
102 # else
103 # define int64_t_C(c) (c ## LL)
104 # define uint64_t_C(c) (c ## ULL)
105 # endif /* __MINGW32__ */
106
107 # ifdef _DEBUG
108 # define DEBUG
109 # endif
110
111 # define snprintf _snprintf
112 # define vsnprintf _vsnprintf
113
114 /* CONFIG_WIN32 end */
115 #elif defined (CONFIG_OS2)
116 /* OS/2 EMX */
117
118 #include <inttypes.h>
119
120 #ifdef HAVE_AV_CONFIG_H
121
122 #ifndef int64_t_C
123 #define int64_t_C(c) (c ## LL)
124 #define uint64_t_C(c) (c ## ULL)
125 #endif
126
127 #ifdef USE_FASTMEMCPY
128 #include "fastmemcpy.h"
129 #endif
130
131 #include <float.h>
132
133 #endif /* HAVE_AV_CONFIG_H */
134
135 /* CONFIG_OS2 end */
136 #else
137
138 /* unix */
139
140 # include <inttypes.h>
141
142 # ifdef HAVE_AV_CONFIG_H
143 # ifndef int64_t_C
144 # define int64_t_C(c) (c ## LL)
145 # define uint64_t_C(c) (c ## ULL)
146 # endif
147
148 # ifdef USE_FASTMEMCPY
149 # include "fastmemcpy.h"
150 # endif
151 # endif /* HAVE_AV_CONFIG_H */
152
153 #endif /* !CONFIG_WIN32 && !CONFIG_OS2 */
154
155 #ifdef HAVE_AV_CONFIG_H
156
157 # include "bswap.h"
158
159 # if defined(__MINGW32__) || defined(__CYGWIN__) || \
160 defined(__OS2__) || (defined (__OpenBSD__) && !defined(__ELF__))
161 # define MANGLE(a) "_" #a
162 # else
163 # define MANGLE(a) #a
164 # endif
165
166 /* debug stuff */
167
168 # ifndef DEBUG
169 # define NDEBUG
170 # endif
171 # include <assert.h>
172
173 /* dprintf macros */
174 # if defined(CONFIG_WIN32) && !defined(__MINGW32__)
175
176 inline void dprintf(const char* fmt,...) {}
177
178 # else
179
180 # ifdef DEBUG
181 # define dprintf(fmt,args...) printf(fmt, ## args)
182 # else
183 # define dprintf(fmt,args...)
184 # endif
185
186 # endif /* !CONFIG_WIN32 */
187
188 # define av_abort() do { fprintf(stderr, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)
189
190 //rounded divison & shift
191 #define RSHIFT(a,b) ((a) > 0 ? ((a) + (1<<((b)-1)))>>(b) : ((a) + (1<<((b)-1))-1)>>(b))
192 /* assume b>0 */
193 #define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
194 #define ABS(a) ((a) >= 0 ? (a) : (-(a)))
195
196 #define FFMAX(a,b) ((a) > (b) ? (a) : (b))
197 #define FFMIN(a,b) ((a) > (b) ? (b) : (a))
198
199 #ifdef ARCH_X86
200 // avoid +32 for shift optimization (gcc should do that ...)
201 static inline int32_t NEG_SSR32( int32_t a, int8_t s){
202 asm ("sarl %1, %0\n\t"
203 : "+r" (a)
204 : "ic" ((uint8_t)(-s))
205 );
206 return a;
207 }
208 static inline uint32_t NEG_USR32(uint32_t a, int8_t s){
209 asm ("shrl %1, %0\n\t"
210 : "+r" (a)
211 : "ic" ((uint8_t)(-s))
212 );
213 return a;
214 }
215 #else
216 # define NEG_SSR32(a,s) ((( int32_t)(a))>>(32-(s)))
217 # define NEG_USR32(a,s) (((uint32_t)(a))>>(32-(s)))
218 #endif
219
220 /* bit output */
221
222 struct PutBitContext;
223
224 typedef void (*WriteDataFunc)(void *, uint8_t *, int);
225
226 typedef struct PutBitContext {
227 #ifdef ALT_BITSTREAM_WRITER
228 uint8_t *buf, *buf_end;
229 int index;
230 #else
231 uint32_t bit_buf;
232 int bit_left;
233 uint8_t *buf, *buf_ptr, *buf_end;
234 #endif
235 int64_t data_out_size; /* in bytes */
236 } PutBitContext;
237
238 void init_put_bits(PutBitContext *s,
239 uint8_t *buffer, int buffer_size,
240 void *opaque,
241 void (*write_data)(void *, uint8_t *, int));
242
243 int64_t get_bit_count(PutBitContext *s); /* XXX: change function name */
244 void align_put_bits(PutBitContext *s);
245 void flush_put_bits(PutBitContext *s);
246 void put_string(PutBitContext * pbc, char *s);
247
248 /* bit input */
249
250 typedef struct GetBitContext {
251 const uint8_t *buffer, *buffer_end;
252 #ifdef ALT_BITSTREAM_READER
253 int index;
254 #elif defined LIBMPEG2_BITSTREAM_READER
255 uint8_t *buffer_ptr;
256 uint32_t cache;
257 int bit_count;
258 #elif defined A32_BITSTREAM_READER
259 uint32_t *buffer_ptr;
260 uint32_t cache0;
261 uint32_t cache1;
262 int bit_count;
263 #endif
264 int size_in_bits;
265 } GetBitContext;
266
267 static inline int get_bits_count(GetBitContext *s);
268
269 #define VLC_TYPE int16_t
270
271 typedef struct VLC {
272 int bits;
273 VLC_TYPE (*table)[2]; ///< code, bits
274 int table_size, table_allocated;
275 } VLC;
276
277 typedef struct RL_VLC_ELEM {
278 int16_t level;
279 int8_t len;
280 uint8_t run;
281 } RL_VLC_ELEM;
282
283 #ifdef ARCH_SPARC64
284 #define UNALIGNED_STORES_ARE_BAD
285 #endif
286
287 /* used to avoid missaligned exceptions on some archs (alpha, ...) */
288 #ifdef ARCH_X86
289 # define unaligned32(a) (*(uint32_t*)(a))
290 #else
291 # ifdef __GNUC__
292 static inline uint32_t unaligned32(const void *v) {
293 struct Unaligned {
294 uint32_t i;
295 } __attribute__((packed));
296
297 return ((const struct Unaligned *) v)->i;
298 }
299 # elif defined(__DECC)
300 static inline uint32_t unaligned32(const void *v) {
301 return *(const __unaligned uint32_t *) v;
302 }
303 # else
304 static inline uint32_t unaligned32(const void *v) {
305 return *(const uint32_t *) v;
306 }
307 # endif
308 #endif //!ARCH_X86
309
310 #ifndef ALT_BITSTREAM_WRITER
311 static inline void put_bits(PutBitContext *s, int n, unsigned int value)
312 {
313 unsigned int bit_buf;
314 int bit_left;
315
316 #ifdef STATS
317 st_out_bit_counts[st_current_index] += n;
318 #endif
319 // printf("put_bits=%d %x\n", n, value);
320 assert(n == 32 || value < (1U << n));
321
322 bit_buf = s->bit_buf;
323 bit_left = s->bit_left;
324
325 // printf("n=%d value=%x cnt=%d buf=%x\n", n, value, bit_cnt, bit_buf);
326 /* XXX: optimize */
327 if (n < bit_left) {
328 bit_buf = (bit_buf<<n) | value;
329 bit_left-=n;
330 } else {
331 bit_buf<<=bit_left;
332 bit_buf |= value >> (n - bit_left);
333 #ifdef UNALIGNED_STORES_ARE_BAD
334 if (3 & (int) s->buf_ptr) {
335 s->buf_ptr[0] = bit_buf >> 24;
336 s->buf_ptr[1] = bit_buf >> 16;
337 s->buf_ptr[2] = bit_buf >> 8;
338 s->buf_ptr[3] = bit_buf ;
339 } else
340 #endif
341 *(uint32_t *)s->buf_ptr = be2me_32(bit_buf);
342 //printf("bitbuf = %08x\n", bit_buf);
343 s->buf_ptr+=4;
344 bit_left+=32 - n;
345 bit_buf = value;
346 }
347
348 s->bit_buf = bit_buf;
349 s->bit_left = bit_left;
350 }
351 #endif
352
353
354 #ifdef ALT_BITSTREAM_WRITER
355 static inline void put_bits(PutBitContext *s, int n, unsigned int value)
356 {
357 # ifdef ALIGNED_BITSTREAM_WRITER
358 # ifdef ARCH_X86
359 asm volatile(
360 "movl %0, %%ecx \n\t"
361 "xorl %%eax, %%eax \n\t"
362 "shrdl %%cl, %1, %%eax \n\t"
363 "shrl %%cl, %1 \n\t"
364 "movl %0, %%ecx \n\t"
365 "shrl $3, %%ecx \n\t"
366 "andl $0xFFFFFFFC, %%ecx \n\t"
367 "bswapl %1 \n\t"
368 "orl %1, (%2, %%ecx) \n\t"
369 "bswapl %%eax \n\t"
370 "addl %3, %0 \n\t"
371 "movl %%eax, 4(%2, %%ecx) \n\t"
372 : "=&r" (s->index), "=&r" (value)
373 : "r" (s->buf), "r" (n), "0" (s->index), "1" (value<<(-n))
374 : "%eax", "%ecx"
375 );
376 # else
377 int index= s->index;
378 uint32_t *ptr= ((uint32_t *)s->buf)+(index>>5);
379
380 value<<= 32-n;
381
382 ptr[0] |= be2me_32(value>>(index&31));
383 ptr[1] = be2me_32(value<<(32-(index&31)));
384 //if(n>24) printf("%d %d\n", n, value);
385 index+= n;
386 s->index= index;
387 # endif
388 # else //ALIGNED_BITSTREAM_WRITER
389 # ifdef ARCH_X86
390 asm volatile(
391 "movl $7, %%ecx \n\t"
392 "andl %0, %%ecx \n\t"
393 "addl %3, %%ecx \n\t"
394 "negl %%ecx \n\t"
395 "shll %%cl, %1 \n\t"
396 "bswapl %1 \n\t"
397 "movl %0, %%ecx \n\t"
398 "shrl $3, %%ecx \n\t"
399 "orl %1, (%%ecx, %2) \n\t"
400 "addl %3, %0 \n\t"
401 "movl $0, 4(%%ecx, %2) \n\t"
402 : "=&r" (s->index), "=&r" (value)
403 : "r" (s->buf), "r" (n), "0" (s->index), "1" (value)
404 : "%ecx"
405 );
406 # else
407 int index= s->index;
408 uint32_t *ptr= (uint32_t*)(((uint8_t *)s->buf)+(index>>3));
409
410 ptr[0] |= be2me_32(value<<(32-n-(index&7) ));
411 ptr[1] = 0;
412 //if(n>24) printf("%d %d\n", n, value);
413 index+= n;
414 s->index= index;
415 # endif
416 # endif //!ALIGNED_BITSTREAM_WRITER
417 }
418 #endif
419
420
421 static inline uint8_t* pbBufPtr(PutBitContext *s)
422 {
423 #ifdef ALT_BITSTREAM_WRITER
424 return s->buf + (s->index>>3);
425 #else
426 return s->buf_ptr;
427 #endif
428 }
429
430 /* Bitstream reader API docs:
431 name
432 abritary name which is used as prefix for the internal variables
433
434 gb
435 getbitcontext
436
437 OPEN_READER(name, gb)
438 loads gb into local variables
439
440 CLOSE_READER(name, gb)
441 stores local vars in gb
442
443 UPDATE_CACHE(name, gb)
444 refills the internal cache from the bitstream
445 after this call at least MIN_CACHE_BITS will be available,
446
447 GET_CACHE(name, gb)
448 will output the contents of the internal cache, next bit is MSB of 32 or 64 bit (FIXME 64bit)
449
450 SHOW_UBITS(name, gb, num)
451 will return the nest num bits
452
453 SHOW_SBITS(name, gb, num)
454 will return the nest num bits and do sign extension
455
456 SKIP_BITS(name, gb, num)
457 will skip over the next num bits
458 note, this is equinvalent to SKIP_CACHE; SKIP_COUNTER
459
460 SKIP_CACHE(name, gb, num)
461 will remove the next num bits from the cache (note SKIP_COUNTER MUST be called before UPDATE_CACHE / CLOSE_READER)
462
463 SKIP_COUNTER(name, gb, num)
464 will increment the internal bit counter (see SKIP_CACHE & SKIP_BITS)
465
466 LAST_SKIP_CACHE(name, gb, num)
467 will remove the next num bits from the cache if it is needed for UPDATE_CACHE otherwise it will do nothing
468
469 LAST_SKIP_BITS(name, gb, num)
470 is equinvalent to SKIP_LAST_CACHE; SKIP_COUNTER
471
472 for examples see get_bits, show_bits, skip_bits, get_vlc
473 */
474
475 #ifdef ALT_BITSTREAM_READER
476 # define MIN_CACHE_BITS 25
477
478 # define OPEN_READER(name, gb)\
479 int name##_index= (gb)->index;\
480 int name##_cache= 0;\
481
482 # define CLOSE_READER(name, gb)\
483 (gb)->index= name##_index;\
484
485 # define UPDATE_CACHE(name, gb)\
486 name##_cache= be2me_32( unaligned32( ((uint8_t *)(gb)->buffer)+(name##_index>>3) ) ) << (name##_index&0x07);\
487
488 # define SKIP_CACHE(name, gb, num)\
489 name##_cache <<= (num);\
490
491 // FIXME name?
492 # define SKIP_COUNTER(name, gb, num)\
493 name##_index += (num);\
494
495 # define SKIP_BITS(name, gb, num)\
496 {\
497 SKIP_CACHE(name, gb, num)\
498 SKIP_COUNTER(name, gb, num)\
499 }\
500
501 # define LAST_SKIP_BITS(name, gb, num) SKIP_COUNTER(name, gb, num)
502 # define LAST_SKIP_CACHE(name, gb, num) ;
503
504 # define SHOW_UBITS(name, gb, num)\
505 NEG_USR32(name##_cache, num)
506
507 # define SHOW_SBITS(name, gb, num)\
508 NEG_SSR32(name##_cache, num)
509
510 # define GET_CACHE(name, gb)\
511 ((uint32_t)name##_cache)
512
513 static inline int get_bits_count(GetBitContext *s){
514 return s->index;
515 }
516 #elif defined LIBMPEG2_BITSTREAM_READER
517 //libmpeg2 like reader
518
519 # define MIN_CACHE_BITS 16
520
521 # define OPEN_READER(name, gb)\
522 int name##_bit_count=(gb)->bit_count;\
523 int name##_cache= (gb)->cache;\
524 uint8_t * name##_buffer_ptr=(gb)->buffer_ptr;\
525
526 # define CLOSE_READER(name, gb)\
527 (gb)->bit_count= name##_bit_count;\
528 (gb)->cache= name##_cache;\
529 (gb)->buffer_ptr= name##_buffer_ptr;\
530
531 # define UPDATE_CACHE(name, gb)\
532 if(name##_bit_count > 0){\
533 name##_cache+= ((name##_buffer_ptr[0]<<8) + name##_buffer_ptr[1]) << name##_bit_count;\
534 name##_buffer_ptr+=2;\
535 name##_bit_count-= 16;\
536 }\
537
538 # define SKIP_CACHE(name, gb, num)\
539 name##_cache <<= (num);\
540
541 # define SKIP_COUNTER(name, gb, num)\
542 name##_bit_count += (num);\
543
544 # define SKIP_BITS(name, gb, num)\
545 {\
546 SKIP_CACHE(name, gb, num)\
547 SKIP_COUNTER(name, gb, num)\
548 }\
549
550 # define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num)
551 # define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num)
552
553 # define SHOW_UBITS(name, gb, num)\
554 NEG_USR32(name##_cache, num)
555
556 # define SHOW_SBITS(name, gb, num)\
557 NEG_SSR32(name##_cache, num)
558
559 # define GET_CACHE(name, gb)\
560 ((uint32_t)name##_cache)
561
562 static inline int get_bits_count(GetBitContext *s){
563 return (s->buffer_ptr - s->buffer)*8 - 16 + s->bit_count;
564 }
565
566 #elif defined A32_BITSTREAM_READER
567
568 # define MIN_CACHE_BITS 32
569
570 # define OPEN_READER(name, gb)\
571 int name##_bit_count=(gb)->bit_count;\
572 uint32_t name##_cache0= (gb)->cache0;\
573 uint32_t name##_cache1= (gb)->cache1;\
574 uint32_t * name##_buffer_ptr=(gb)->buffer_ptr;\
575
576 # define CLOSE_READER(name, gb)\
577 (gb)->bit_count= name##_bit_count;\
578 (gb)->cache0= name##_cache0;\
579 (gb)->cache1= name##_cache1;\
580 (gb)->buffer_ptr= name##_buffer_ptr;\
581
582 # define UPDATE_CACHE(name, gb)\
583 if(name##_bit_count > 0){\
584 const uint32_t next= be2me_32( *name##_buffer_ptr );\
585 name##_cache0 |= NEG_USR32(next,name##_bit_count);\
586 name##_cache1 |= next<<name##_bit_count;\
587 name##_buffer_ptr++;\
588 name##_bit_count-= 32;\
589 }\
590
591 #ifdef ARCH_X86
592 # define SKIP_CACHE(name, gb, num)\
593 asm(\
594 "shldl %2, %1, %0 \n\t"\
595 "shll %2, %1 \n\t"\
596 : "+r" (name##_cache0), "+r" (name##_cache1)\
597 : "Ic" ((uint8_t)num)\
598 );
599 #else
600 # define SKIP_CACHE(name, gb, num)\
601 name##_cache0 <<= (num);\
602 name##_cache0 |= NEG_USR32(name##_cache1,num);\
603 name##_cache1 <<= (num);
604 #endif
605
606 # define SKIP_COUNTER(name, gb, num)\
607 name##_bit_count += (num);\
608
609 # define SKIP_BITS(name, gb, num)\
610 {\
611 SKIP_CACHE(name, gb, num)\
612 SKIP_COUNTER(name, gb, num)\
613 }\
614
615 # define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num)
616 # define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num)
617
618 # define SHOW_UBITS(name, gb, num)\
619 NEG_USR32(name##_cache0, num)
620
621 # define SHOW_SBITS(name, gb, num)\
622 NEG_SSR32(name##_cache0, num)
623
624 # define GET_CACHE(name, gb)\
625 (name##_cache0)
626
627 static inline int get_bits_count(GetBitContext *s){
628 return ((uint8_t*)s->buffer_ptr - s->buffer)*8 - 32 + s->bit_count;
629 }
630
631 #endif
632
633 static inline unsigned int get_bits(GetBitContext *s, int n){
634 register int tmp;
635 OPEN_READER(re, s)
636 UPDATE_CACHE(re, s)
637 tmp= SHOW_UBITS(re, s, n);
638 LAST_SKIP_BITS(re, s, n)
639 CLOSE_READER(re, s)
640 return tmp;
641 }
642
643 static inline unsigned int show_bits(GetBitContext *s, int n){
644 register int tmp;
645 OPEN_READER(re, s)
646 UPDATE_CACHE(re, s)
647 tmp= SHOW_UBITS(re, s, n);
648 // CLOSE_READER(re, s)
649 return tmp;
650 }
651
652 static inline void skip_bits(GetBitContext *s, int n){
653 //Note gcc seems to optimize this to s->index+=n for the ALT_READER :))
654 OPEN_READER(re, s)
655 UPDATE_CACHE(re, s)
656 LAST_SKIP_BITS(re, s, n)
657 CLOSE_READER(re, s)
658 }
659
660 static inline unsigned int get_bits1(GetBitContext *s){
661 #ifdef ALT_BITSTREAM_READER
662 int index= s->index;
663 uint8_t result= s->buffer[ index>>3 ];
664 result<<= (index&0x07);
665 result>>= 8 - 1;
666 index++;
667 s->index= index;
668
669 return result;
670 #else
671 return get_bits(s, 1);
672 #endif
673 }
674
675 static inline unsigned int show_bits1(GetBitContext *s){
676 return show_bits(s, 1);
677 }
678
679 static inline void skip_bits1(GetBitContext *s){
680 skip_bits(s, 1);
681 }
682
683 void init_get_bits(GetBitContext *s,
684 const uint8_t *buffer, int buffer_size);
685
686 int check_marker(GetBitContext *s, const char *msg);
687 void align_get_bits(GetBitContext *s);
688 int init_vlc(VLC *vlc, int nb_bits, int nb_codes,
689 const void *bits, int bits_wrap, int bits_size,
690 const void *codes, int codes_wrap, int codes_size);
691 void free_vlc(VLC *vlc);
692
693 /**
694 *
695 * if the vlc code is invalid and max_depth=1 than no bits will be removed
696 * if the vlc code is invalid and max_depth>1 than the number of bits removed
697 * is undefined
698 */
699 #define GET_VLC(code, name, gb, table, bits, max_depth)\
700 {\
701 int n, index, nb_bits;\
702 \
703 index= SHOW_UBITS(name, gb, bits);\
704 code = table[index][0];\
705 n = table[index][1];\
706 \
707 if(max_depth > 1 && n < 0){\
708 LAST_SKIP_BITS(name, gb, bits)\
709 UPDATE_CACHE(name, gb)\
710 \
711 nb_bits = -n;\
712 \
713 index= SHOW_UBITS(name, gb, nb_bits) + code;\
714 code = table[index][0];\
715 n = table[index][1];\
716 if(max_depth > 2 && n < 0){\
717 LAST_SKIP_BITS(name, gb, nb_bits)\
718 UPDATE_CACHE(name, gb)\
719 \
720 nb_bits = -n;\
721 \
722 index= SHOW_UBITS(name, gb, nb_bits) + code;\
723 code = table[index][0];\
724 n = table[index][1];\
725 }\
726 }\
727 SKIP_BITS(name, gb, n)\
728 }
729
730 #define GET_RL_VLC(level, run, name, gb, table, bits, max_depth)\
731 {\
732 int n, index, nb_bits;\
733 \
734 index= SHOW_UBITS(name, gb, bits);\
735 level = table[index].level;\
736 n = table[index].len;\
737 \
738 if(max_depth > 1 && n < 0){\
739 LAST_SKIP_BITS(name, gb, bits)\
740 UPDATE_CACHE(name, gb)\
741 \
742 nb_bits = -n;\
743 \
744 index= SHOW_UBITS(name, gb, nb_bits) + level;\
745 level = table[index].level;\
746 n = table[index].len;\
747 }\
748 run= table[index].run;\
749 SKIP_BITS(name, gb, n)\
750 }
751
752 // deprecated, dont use get_vlc for new code, use get_vlc2 instead or use GET_VLC directly
753 static inline int get_vlc(GetBitContext *s, VLC *vlc)
754 {
755 int code;
756 VLC_TYPE (*table)[2]= vlc->table;
757
758 OPEN_READER(re, s)
759 UPDATE_CACHE(re, s)
760
761 GET_VLC(code, re, s, table, vlc->bits, 3)
762
763 CLOSE_READER(re, s)
764 return code;
765 }
766
767 /**
768 * parses a vlc code, faster then get_vlc()
769 * @param bits is the number of bits which will be read at once, must be
770 * identical to nb_bits in init_vlc()
771 * @param max_depth is the number of times bits bits must be readed to completly
772 * read the longest vlc code
773 * = (max_vlc_length + bits - 1) / bits
774 */
775 static always_inline int get_vlc2(GetBitContext *s, VLC_TYPE (*table)[2],
776 int bits, int max_depth)
777 {
778 int code;
779
780 OPEN_READER(re, s)
781 UPDATE_CACHE(re, s)
782
783 GET_VLC(code, re, s, table, bits, max_depth)
784
785 CLOSE_READER(re, s)
786 return code;
787 }
788
789 //#define TRACE
790
791 #ifdef TRACE
792
793 static inline void print_bin(int bits, int n){
794 int i;
795
796 for(i=n-1; i>=0; i--){
797 printf("%d", (bits>>i)&1);
798 }
799 for(i=n; i<24; i++)
800 printf(" ");
801 }
802
803 static inline int get_bits_trace(GetBitContext *s, int n, char *file, char *func, int line){
804 int r= get_bits(s, n);
805
806 print_bin(r, n);
807 printf("%5d %2d %3d bit @%5d in %s %s:%d\n", r, n, r, get_bits_count(s)-n, file, func, line);
808 return r;
809 }
810 static inline int get_vlc_trace(GetBitContext *s, VLC_TYPE (*table)[2], int bits, int max_depth, char *file, char *func, int line){
811 int show= show_bits(s, 24);
812 int pos= get_bits_count(s);
813 int r= get_vlc2(s, table, bits, max_depth);
814 int len= get_bits_count(s) - pos;
815 int bits2= show>>(24-len);
816
817 print_bin(bits2, len);
818
819 printf("%5d %2d %3d vlc @%5d in %s %s:%d\n", bits2, len, r, pos, file, func, line);
820 return r;
821 }
822
823 #define get_bits(s, n) get_bits_trace(s, n, __FILE__, __PRETTY_FUNCTION__, __LINE__)
824 #define get_bits1(s) get_bits_trace(s, 1, __FILE__, __PRETTY_FUNCTION__, __LINE__)
825 #define get_vlc(s, vlc) get_vlc_trace(s, (vlc)->table, (vlc)->bits, 3, __FILE__, __PRETTY_FUNCTION__, __LINE__)
826 #define get_vlc2(s, tab, bits, max) get_vlc_trace(s, tab, bits, max, __FILE__, __PRETTY_FUNCTION__, __LINE__)
827
828 #define tprintf printf
829
830 #else //TRACE
831 #define tprintf(_arg...) {}
832 #endif
833
834 /* define it to include statistics code (useful only for optimizing
835 codec efficiency */
836 //#define STATS
837
838 #ifdef STATS
839
840 enum {
841 ST_UNKNOWN,
842 ST_DC,
843 ST_INTRA_AC,
844 ST_INTER_AC,
845 ST_INTRA_MB,
846 ST_INTER_MB,
847 ST_MV,
848 ST_NB,
849 };
850
851 extern int st_current_index;
852 extern unsigned int st_bit_counts[ST_NB];
853 extern unsigned int st_out_bit_counts[ST_NB];
854
855 void print_stats(void);
856 #endif
857
858 /* misc math functions */
859 extern const uint8_t ff_log2_tab[256];
860
861 static inline int av_log2(unsigned int v)
862 {
863 int n;
864
865 n = 0;
866 if (v & 0xffff0000) {
867 v >>= 16;
868 n += 16;
869 }
870 if (v & 0xff00) {
871 v >>= 8;
872 n += 8;
873 }
874 n += ff_log2_tab[v];
875
876 return n;
877 }
878
879 static inline int av_log2_16bit(unsigned int v)
880 {
881 int n;
882
883 n = 0;
884 if (v & 0xff00) {
885 v >>= 8;
886 n += 8;
887 }
888 n += ff_log2_tab[v];
889
890 return n;
891 }
892
893
894 /* median of 3 */
895 static inline int mid_pred(int a, int b, int c)
896 {
897 int vmin, vmax;
898 vmax = vmin = a;
899 if (b < vmin)
900 vmin = b;
901 else
902 vmax = b;
903
904 if (c < vmin)
905 vmin = c;
906 else if (c > vmax)
907 vmax = c;
908
909 return a + b + c - vmin - vmax;
910 }
911
912 static inline int clip(int a, int amin, int amax)
913 {
914 if (a < amin)
915 return amin;
916 else if (a > amax)
917 return amax;
918 else
919 return a;
920 }
921
922 /* math */
923 extern const uint8_t ff_sqrt_tab[128];
924
925 int64_t ff_gcd(int64_t a, int64_t b);
926
927 static inline int ff_sqrt(int a)
928 {
929 int ret=0;
930 int s;
931 int ret_sq=0;
932
933 if(a<128) return ff_sqrt_tab[a];
934
935 for(s=15; s>=0; s--){
936 int b= ret_sq + (1<<(s*2)) + (ret<<s)*2;
937 if(b<=a){
938 ret_sq=b;
939 ret+= 1<<s;
940 }
941 }
942 return ret;
943 }
944
945 /**
946 * converts fourcc string to int
947 */
948 static inline int ff_get_fourcc(const char *s){
949 assert( strlen(s)==4 );
950
951 return (s[0]) + (s[1]<<8) + (s[2]<<16) + (s[3]<<24);
952 }
953
954 #define MKTAG(a,b,c,d) (a | (b << 8) | (c << 16) | (d << 24))
955 #define MKBETAG(a,b,c,d) (d | (c << 8) | (b << 16) | (a << 24))
956
957
958 void ff_float2fraction(int *nom_arg, int *denom_arg, double f, int max);
959
960
961 #ifdef ARCH_X86
962 #define MASK_ABS(mask, level)\
963 asm volatile(\
964 "cdq \n\t"\
965 "xorl %1, %0 \n\t"\
966 "subl %1, %0 \n\t"\
967 : "+a" (level), "=&d" (mask)\
968 );
969 #else
970 #define MASK_ABS(mask, level)\
971 mask= level>>31;\
972 level= (level^mask)-mask;
973 #endif
974
975
976 #if __CPU__ >= 686 && !defined(RUNTIME_CPUDETECT)
977 #define COPY3_IF_LT(x,y,a,b,c,d)\
978 asm volatile (\
979 "cmpl %0, %3 \n\t"\
980 "cmovl %3, %0 \n\t"\
981 "cmovl %4, %1 \n\t"\
982 "cmovl %5, %2 \n\t"\
983 : "+r" (x), "+r" (a), "+r" (c)\
984 : "r" (y), "r" (b), "r" (d)\
985 );
986 #else
987 #define COPY3_IF_LT(x,y,a,b,c,d)\
988 if((y)<(x)){\
989 (x)=(y);\
990 (a)=(b);\
991 (c)=(d);\
992 }
993 #endif
994
995 #define CLAMP_TO_8BIT(d) ((d > 0xff) ? 0xff : (d < 0) ? 0 : d)
996
997 /* avoid usage of various functions */
998 #define malloc please_use_av_malloc
999 #define free please_use_av_free
1000 #define realloc please_use_av_realloc
1001
1002 #define CHECKED_ALLOCZ(p, size)\
1003 {\
1004 p= av_mallocz(size);\
1005 if(p==NULL){\
1006 perror("malloc");\
1007 goto fail;\
1008 }\
1009 }
1010
1011 #endif /* HAVE_AV_CONFIG_H */
1012
1013 #endif /* COMMON_H */