generic M_PI define
[libav.git] / libavcodec / common.h
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1#ifndef COMMON_H
2#define COMMON_H
3
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4#define FFMPEG_VERSION_INT 0x000406
5#define FFMPEG_VERSION "0.4.6"
1a565432 6
4bdd9157 7#if defined(WIN32) && !defined(__MINGW32__) && !defined(__CYGWIN__)
9b59c92f 8# define CONFIG_WIN32
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9#endif
10
17592475 11//#define ALT_BITSTREAM_WRITER
4f0f8bfc 12//#define ALIGNED_BITSTREAM_WRITER
3530320d 13
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14#define ALT_BITSTREAM_READER
15//#define LIBMPEG2_BITSTREAM_READER
16//#define A32_BITSTREAM_READER
17
420b073b 18#ifdef HAVE_AV_CONFIG_H
1a565432 19/* only include the following when compiling package */
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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
1a565432 35
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36#ifndef M_PI
37#define M_PI 3.14159265358979323846
38#endif
39
44f27b3a 40#endif /* HAVE_AV_CONFIG_H */
1a565432 41
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42/* Suppress restrict if it was not defined in config.h. */
43#ifndef restrict
9b59c92f 44# define restrict
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45#endif
46
d200cab6 47#if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
9b59c92f 48# define always_inline __attribute__((always_inline)) inline
d200cab6 49#else
9b59c92f 50# define always_inline inline
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51#endif
52
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53#ifdef CONFIG_WIN32
54
55/* windows */
56
57typedef unsigned short UINT16;
58typedef signed short INT16;
59typedef unsigned char UINT8;
60typedef unsigned int UINT32;
61typedef unsigned __int64 UINT64;
62typedef signed char INT8;
63typedef signed int INT32;
64typedef signed __int64 INT64;
65
66typedef UINT8 uint8_t;
67typedef INT8 int8_t;
68typedef UINT16 uint16_t;
69typedef INT16 int16_t;
70typedef UINT32 uint32_t;
71typedef INT32 int32_t;
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72typedef UINT64 uint64_t;
73typedef INT64 int64_t;
1a565432 74
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75# ifndef __MINGW32__
76# define INT64_C(c) (c ## i64)
77# define UINT64_C(c) (c ## i64)
1a565432 78
9b59c92f 79# define inline __inline
1a565432 80
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81# else
82# define INT64_C(c) (c ## LL)
83# define UINT64_C(c) (c ## ULL)
84# endif /* __MINGW32__ */
a74127c0 85
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86# ifdef _DEBUG
87# define DEBUG
88# endif
de6d9b64 89
9b59c92f 90# define snprintf _snprintf
1a565432 91
d503f970 92#else /* CONFIG_WIN32 */
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93
94/* unix */
95
9b59c92f 96# include <inttypes.h>
1a565432 97
9b59c92f 98# ifndef __WINE_WINDEF16_H
980fc7b8 99/* workaround for typedef conflict in MPlayer (wine typedefs) */
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100typedef unsigned short UINT16;
101typedef signed short INT16;
9b59c92f 102# endif
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103
104typedef unsigned char UINT8;
105typedef unsigned int UINT32;
106typedef unsigned long long UINT64;
107typedef signed char INT8;
108typedef signed int INT32;
109typedef signed long long INT64;
110
9b59c92f 111# ifdef HAVE_AV_CONFIG_H
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112# ifndef INT64_C
113# define INT64_C(c) (c ## LL)
114# define UINT64_C(c) (c ## ULL)
115# endif
1a565432 116
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117# ifdef USE_FASTMEMCPY
118# include "fastmemcpy.h"
119# endif
9b59c92f 120# endif /* HAVE_AV_CONFIG_H */
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121
122#endif /* !CONFIG_WIN32 */
123
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124#ifdef HAVE_AV_CONFIG_H
125
9b59c92f 126# include "bswap.h"
96707bb7 127
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128# if defined(__MINGW32__) || defined(__CYGWIN__) || \
129 defined(__OS2__) || defined (__OpenBSD__)
130# define MANGLE(a) "_" #a
131# else
132# define MANGLE(a) #a
133# endif
6a3d7e36 134
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135/* debug stuff */
136
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137# ifndef DEBUG
138# define NDEBUG
139# endif
140# include <assert.h>
1a565432 141
a74127c0 142/* dprintf macros */
9b59c92f 143# if defined(CONFIG_WIN32) && !defined(__MINGW32__)
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144
145inline void dprintf(const char* fmt,...) {}
146
9b59c92f 147# else
a74127c0 148
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149# ifdef DEBUG
150# define dprintf(fmt,args...) printf(fmt, ## args)
151# else
152# define dprintf(fmt,args...)
153# endif
1a565432 154
9b59c92f 155# endif /* !CONFIG_WIN32 */
1a565432 156
9b59c92f 157# define av_abort() do { fprintf(stderr, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)
935cdf09 158
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159//rounded divison & shift
160#define RSHIFT(a,b) ((a) > 0 ? ((a) + (1<<((b)-1)))>>(b) : ((a) + (1<<((b)-1))-1)>>(b))
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161/* assume b>0 */
162#define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
32cd20de 163#define ABS(a) ((a) >= 0 ? (a) : (-(a)))
75460b0c 164
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165#define FFMAX(a,b) ((a) > (b) ? (a) : (b))
166#define FFMIN(a,b) ((a) > (b) ? (b) : (a))
d7e9533a 167
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168#ifdef ARCH_X86
169// avoid +32 for shift optimization (gcc should do that ...)
170static inline int32_t NEG_SSR32( int32_t a, int8_t s){
171 asm ("sarl %1, %0\n\t"
172 : "+r" (a)
173 : "ic" ((uint8_t)(-s))
174 );
175 return a;
176}
177static inline uint32_t NEG_USR32(uint32_t a, int8_t s){
178 asm ("shrl %1, %0\n\t"
179 : "+r" (a)
180 : "ic" ((uint8_t)(-s))
181 );
182 return a;
183}
8db1a1dd 184#else
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185# define NEG_SSR32(a,s) ((( int32_t)(a))>>(32-(s)))
186# define NEG_USR32(a,s) (((uint32_t)(a))>>(32-(s)))
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187#endif
188
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189/* bit output */
190
191struct PutBitContext;
192
193typedef void (*WriteDataFunc)(void *, UINT8 *, int);
194
195typedef struct PutBitContext {
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196#ifdef ALT_BITSTREAM_WRITER
197 UINT8 *buf, *buf_end;
198 int index;
199#else
de6d9b64 200 UINT32 bit_buf;
d8cf5aea 201 int bit_left;
2931ecb9 202 UINT8 *buf, *buf_ptr, *buf_end;
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203#endif
204 INT64 data_out_size; /* in bytes */
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205} PutBitContext;
206
207void init_put_bits(PutBitContext *s,
208 UINT8 *buffer, int buffer_size,
209 void *opaque,
210 void (*write_data)(void *, UINT8 *, int));
17592475 211
9dbf9389 212INT64 get_bit_count(PutBitContext *s); /* XXX: change function name */
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213void align_put_bits(PutBitContext *s);
214void flush_put_bits(PutBitContext *s);
9717dad8 215void put_string(PutBitContext * pbc, char *s);
de6d9b64 216
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217/* bit input */
218
219typedef struct GetBitContext {
8db1a1dd 220 UINT8 *buffer, *buffer_end;
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221#ifdef ALT_BITSTREAM_READER
222 int index;
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223#elif defined LIBMPEG2_BITSTREAM_READER
224 UINT8 *buffer_ptr;
225 UINT32 cache;
226 int bit_count;
227#elif defined A32_BITSTREAM_READER
228 UINT32 *buffer_ptr;
229 UINT32 cache0;
230 UINT32 cache1;
231 int bit_count;
27a3e2c5 232#endif
45870f57 233 int size;
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234} GetBitContext;
235
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236static inline int get_bits_count(GetBitContext *s);
237
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238#define VLC_TYPE INT16
239
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240typedef struct VLC {
241 int bits;
8db1a1dd 242 VLC_TYPE (*table)[2]; // code, bits
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243 int table_size, table_allocated;
244} VLC;
245
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246typedef struct RL_VLC_ELEM {
247 int16_t level;
248 int8_t len;
249 uint8_t run;
250} RL_VLC_ELEM;
251
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252#ifdef ARCH_SPARC64
253#define UNALIGNED_STORES_ARE_BAD
254#endif
255
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256/* used to avoid missaligned exceptions on some archs (alpha, ...) */
257#ifdef ARCH_X86
9b59c92f 258# define unaligned32(a) (*(UINT32*)(a))
3587d501 259#else
9b59c92f 260# ifdef __GNUC__
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261static inline uint32_t unaligned32(const void *v) {
262 struct Unaligned {
263 uint32_t i;
264 } __attribute__((packed));
265
266 return ((const struct Unaligned *) v)->i;
267}
9b59c92f 268# elif defined(__DECC)
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269static inline uint32_t unaligned32(const void *v) {
270 return *(const __unaligned uint32_t *) v;
271}
9b59c92f 272# else
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273static inline uint32_t unaligned32(const void *v) {
274 return *(const uint32_t *) v;
275}
9b59c92f 276# endif
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277#endif //!ARCH_X86
278
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279#ifndef ALT_BITSTREAM_WRITER
280static inline void put_bits(PutBitContext *s, int n, unsigned int value)
281{
282 unsigned int bit_buf;
283 int bit_left;
284
285#ifdef STATS
286 st_out_bit_counts[st_current_index] += n;
287#endif
288 // printf("put_bits=%d %x\n", n, value);
289 assert(n == 32 || value < (1U << n));
fcb609f4 290
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291 bit_buf = s->bit_buf;
292 bit_left = s->bit_left;
293
294 // printf("n=%d value=%x cnt=%d buf=%x\n", n, value, bit_cnt, bit_buf);
295 /* XXX: optimize */
296 if (n < bit_left) {
297 bit_buf = (bit_buf<<n) | value;
298 bit_left-=n;
299 } else {
300 bit_buf<<=bit_left;
301 bit_buf |= value >> (n - bit_left);
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302#ifdef UNALIGNED_STORES_ARE_BAD
303 if (3 & (int) s->buf_ptr) {
304 s->buf_ptr[0] = bit_buf >> 24;
305 s->buf_ptr[1] = bit_buf >> 16;
306 s->buf_ptr[2] = bit_buf >> 8;
307 s->buf_ptr[3] = bit_buf ;
308 } else
309#endif
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310 *(UINT32 *)s->buf_ptr = be2me_32(bit_buf);
311 //printf("bitbuf = %08x\n", bit_buf);
312 s->buf_ptr+=4;
313 bit_left+=32 - n;
314 bit_buf = value;
315 }
316
317 s->bit_buf = bit_buf;
318 s->bit_left = bit_left;
319}
320#endif
321
322
17592475 323#ifdef ALT_BITSTREAM_WRITER
4f0f8bfc 324static inline void put_bits(PutBitContext *s, int n, unsigned int value)
17592475 325{
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326# ifdef ALIGNED_BITSTREAM_WRITER
327# ifdef ARCH_X86
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328 asm volatile(
329 "movl %0, %%ecx \n\t"
330 "xorl %%eax, %%eax \n\t"
331 "shrdl %%cl, %1, %%eax \n\t"
332 "shrl %%cl, %1 \n\t"
333 "movl %0, %%ecx \n\t"
334 "shrl $3, %%ecx \n\t"
335 "andl $0xFFFFFFFC, %%ecx \n\t"
336 "bswapl %1 \n\t"
337 "orl %1, (%2, %%ecx) \n\t"
338 "bswapl %%eax \n\t"
339 "addl %3, %0 \n\t"
340 "movl %%eax, 4(%2, %%ecx) \n\t"
341 : "=&r" (s->index), "=&r" (value)
342 : "r" (s->buf), "r" (n), "0" (s->index), "1" (value<<(-n))
343 : "%eax", "%ecx"
344 );
9b59c92f 345# else
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346 int index= s->index;
347 uint32_t *ptr= ((uint32_t *)s->buf)+(index>>5);
348
349 value<<= 32-n;
350
351 ptr[0] |= be2me_32(value>>(index&31));
352 ptr[1] = be2me_32(value<<(32-(index&31)));
353//if(n>24) printf("%d %d\n", n, value);
354 index+= n;
355 s->index= index;
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356# endif
357# else //ALIGNED_BITSTREAM_WRITER
358# ifdef ARCH_X86
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359 asm volatile(
360 "movl $7, %%ecx \n\t"
361 "andl %0, %%ecx \n\t"
362 "addl %3, %%ecx \n\t"
363 "negl %%ecx \n\t"
364 "shll %%cl, %1 \n\t"
365 "bswapl %1 \n\t"
366 "movl %0, %%ecx \n\t"
367 "shrl $3, %%ecx \n\t"
368 "orl %1, (%%ecx, %2) \n\t"
369 "addl %3, %0 \n\t"
370 "movl $0, 4(%%ecx, %2) \n\t"
371 : "=&r" (s->index), "=&r" (value)
372 : "r" (s->buf), "r" (n), "0" (s->index), "1" (value)
373 : "%ecx"
374 );
9b59c92f 375# else
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376 int index= s->index;
377 uint32_t *ptr= (uint32_t*)(((uint8_t *)s->buf)+(index>>3));
378
379 ptr[0] |= be2me_32(value<<(32-n-(index&7) ));
380 ptr[1] = 0;
381//if(n>24) printf("%d %d\n", n, value);
382 index+= n;
383 s->index= index;
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384# endif
385# endif //!ALIGNED_BITSTREAM_WRITER
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386}
387#endif
388
17592475 389
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390static inline uint8_t* pbBufPtr(PutBitContext *s)
391{
392#ifdef ALT_BITSTREAM_WRITER
393 return s->buf + (s->index>>3);
394#else
395 return s->buf_ptr;
396#endif
397}
398
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399/* Bitstream reader API docs:
400name
401 abritary name which is used as prefix for the internal variables
de6d9b64 402
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403gb
404 getbitcontext
405
406OPEN_READER(name, gb)
407 loads gb into local variables
408
409CLOSE_READER(name, gb)
410 stores local vars in gb
411
412UPDATE_CACHE(name, gb)
413 refills the internal cache from the bitstream
414 after this call at least MIN_CACHE_BITS will be available,
415
416GET_CACHE(name, gb)
417 will output the contents of the internal cache, next bit is MSB of 32 or 64 bit (FIXME 64bit)
418
419SHOW_UBITS(name, gb, num)
420 will return the nest num bits
421
422SHOW_SBITS(name, gb, num)
423 will return the nest num bits and do sign extension
424
425SKIP_BITS(name, gb, num)
426 will skip over the next num bits
427 note, this is equinvalent to SKIP_CACHE; SKIP_COUNTER
428
429SKIP_CACHE(name, gb, num)
430 will remove the next num bits from the cache (note SKIP_COUNTER MUST be called before UPDATE_CACHE / CLOSE_READER)
431
432SKIP_COUNTER(name, gb, num)
433 will increment the internal bit counter (see SKIP_CACHE & SKIP_BITS)
434
435LAST_SKIP_CACHE(name, gb, num)
436 will remove the next num bits from the cache if it is needed for UPDATE_CACHE otherwise it will do nothing
437
438LAST_SKIP_BITS(name, gb, num)
439 is equinvalent to SKIP_LAST_CACHE; SKIP_COUNTER
440
441for examples see get_bits, show_bits, skip_bits, get_vlc
442*/
2931ecb9 443
27a3e2c5 444#ifdef ALT_BITSTREAM_READER
8db1a1dd 445# define MIN_CACHE_BITS 25
27a3e2c5 446
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447# define OPEN_READER(name, gb)\
448 int name##_index= (gb)->index;\
449 int name##_cache= 0;\
450
451# define CLOSE_READER(name, gb)\
452 (gb)->index= name##_index;\
453
454# define UPDATE_CACHE(name, gb)\
455 name##_cache= be2me_32( unaligned32( ((uint8_t *)(gb)->buffer)+(name##_index>>3) ) ) << (name##_index&0x07);\
456
457# define SKIP_CACHE(name, gb, num)\
458 name##_cache <<= (num);\
459
460// FIXME name?
461# define SKIP_COUNTER(name, gb, num)\
462 name##_index += (num);\
463
464# define SKIP_BITS(name, gb, num)\
465 {\
466 SKIP_CACHE(name, gb, num)\
467 SKIP_COUNTER(name, gb, num)\
468 }\
469
470# define LAST_SKIP_BITS(name, gb, num) SKIP_COUNTER(name, gb, num)
471# define LAST_SKIP_CACHE(name, gb, num) ;
472
473# define SHOW_UBITS(name, gb, num)\
ef5e74bb 474 NEG_USR32(name##_cache, num)
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475
476# define SHOW_SBITS(name, gb, num)\
ef5e74bb 477 NEG_SSR32(name##_cache, num)
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478
479# define GET_CACHE(name, gb)\
480 ((uint32_t)name##_cache)
481
482static inline int get_bits_count(GetBitContext *s){
483 return s->index;
2931ecb9 484}
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485#elif defined LIBMPEG2_BITSTREAM_READER
486//libmpeg2 like reader
487
488# define MIN_CACHE_BITS 16
489
490# define OPEN_READER(name, gb)\
491 int name##_bit_count=(gb)->bit_count;\
492 int name##_cache= (gb)->cache;\
493 uint8_t * name##_buffer_ptr=(gb)->buffer_ptr;\
494
495# define CLOSE_READER(name, gb)\
496 (gb)->bit_count= name##_bit_count;\
497 (gb)->cache= name##_cache;\
498 (gb)->buffer_ptr= name##_buffer_ptr;\
499
500# define UPDATE_CACHE(name, gb)\
501 if(name##_bit_count > 0){\
502 name##_cache+= ((name##_buffer_ptr[0]<<8) + name##_buffer_ptr[1]) << name##_bit_count;\
503 name##_buffer_ptr+=2;\
504 name##_bit_count-= 16;\
505 }\
2931ecb9 506
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507# define SKIP_CACHE(name, gb, num)\
508 name##_cache <<= (num);\
509
510# define SKIP_COUNTER(name, gb, num)\
511 name##_bit_count += (num);\
512
513# define SKIP_BITS(name, gb, num)\
514 {\
515 SKIP_CACHE(name, gb, num)\
516 SKIP_COUNTER(name, gb, num)\
517 }\
518
519# define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num)
520# define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num)
521
522# define SHOW_UBITS(name, gb, num)\
ef5e74bb 523 NEG_USR32(name##_cache, num)
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524
525# define SHOW_SBITS(name, gb, num)\
ef5e74bb 526 NEG_SSR32(name##_cache, num)
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527
528# define GET_CACHE(name, gb)\
529 ((uint32_t)name##_cache)
530
531static inline int get_bits_count(GetBitContext *s){
532 return (s->buffer_ptr - s->buffer)*8 - 16 + s->bit_count;
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533}
534
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535#elif defined A32_BITSTREAM_READER
536
537# define MIN_CACHE_BITS 32
538
539# define OPEN_READER(name, gb)\
540 int name##_bit_count=(gb)->bit_count;\
541 uint32_t name##_cache0= (gb)->cache0;\
542 uint32_t name##_cache1= (gb)->cache1;\
543 uint32_t * name##_buffer_ptr=(gb)->buffer_ptr;\
544
545# define CLOSE_READER(name, gb)\
546 (gb)->bit_count= name##_bit_count;\
547 (gb)->cache0= name##_cache0;\
548 (gb)->cache1= name##_cache1;\
549 (gb)->buffer_ptr= name##_buffer_ptr;\
550
551# define UPDATE_CACHE(name, gb)\
552 if(name##_bit_count > 0){\
553 const uint32_t next= be2me_32( *name##_buffer_ptr );\
ef5e74bb 554 name##_cache0 |= NEG_USR32(next,name##_bit_count);\
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555 name##_cache1 |= next<<name##_bit_count;\
556 name##_buffer_ptr++;\
557 name##_bit_count-= 32;\
558 }\
559
3587d501 560#ifdef ARCH_X86
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561# define SKIP_CACHE(name, gb, num)\
562 asm(\
563 "shldl %2, %1, %0 \n\t"\
564 "shll %2, %1 \n\t"\
565 : "+r" (name##_cache0), "+r" (name##_cache1)\
566 : "Ic" ((uint8_t)num)\
567 );
3587d501 568#else
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569# define SKIP_CACHE(name, gb, num)\
570 name##_cache0 <<= (num);\
ef5e74bb 571 name##_cache0 |= NEG_USR32(name##_cache1,num);\
8db1a1dd 572 name##_cache1 <<= (num);
3587d501 573#endif
27a3e2c5 574
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575# define SKIP_COUNTER(name, gb, num)\
576 name##_bit_count += (num);\
577
578# define SKIP_BITS(name, gb, num)\
579 {\
580 SKIP_CACHE(name, gb, num)\
581 SKIP_COUNTER(name, gb, num)\
582 }\
583
584# define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num)
585# define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num)
586
587# define SHOW_UBITS(name, gb, num)\
ef5e74bb 588 NEG_USR32(name##_cache0, num)
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589
590# define SHOW_SBITS(name, gb, num)\
ef5e74bb 591 NEG_SSR32(name##_cache0, num)
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592
593# define GET_CACHE(name, gb)\
594 (name##_cache0)
595
596static inline int get_bits_count(GetBitContext *s){
597 return ((uint8_t*)s->buffer_ptr - s->buffer)*8 - 32 + s->bit_count;
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598}
599
49092244 600#endif
49092244 601
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602static inline unsigned int get_bits(GetBitContext *s, int n){
603 register int tmp;
604 OPEN_READER(re, s)
605 UPDATE_CACHE(re, s)
606 tmp= SHOW_UBITS(re, s, n);
607 LAST_SKIP_BITS(re, s, n)
608 CLOSE_READER(re, s)
609 return tmp;
610}
49092244 611
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612static inline unsigned int show_bits(GetBitContext *s, int n){
613 register int tmp;
614 OPEN_READER(re, s)
615 UPDATE_CACHE(re, s)
616 tmp= SHOW_UBITS(re, s, n);
617// CLOSE_READER(re, s)
618 return tmp;
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619}
620
612476ef 621static inline void skip_bits(GetBitContext *s, int n){
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622 //Note gcc seems to optimize this to s->index+=n for the ALT_READER :))
623 OPEN_READER(re, s)
624 UPDATE_CACHE(re, s)
625 LAST_SKIP_BITS(re, s, n)
626 CLOSE_READER(re, s)
627}
628
629static inline unsigned int get_bits1(GetBitContext *s){
27a3e2c5 630#ifdef ALT_BITSTREAM_READER
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631 int index= s->index;
632 uint8_t result= s->buffer[ index>>3 ];
633 result<<= (index&0x07);
634 result>>= 8 - 1;
635 index++;
636 s->index= index;
fcb609f4 637
8db1a1dd 638 return result;
27a3e2c5 639#else
8db1a1dd 640 return get_bits(s, 1);
27a3e2c5 641#endif
612476ef
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642}
643
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644static inline unsigned int show_bits1(GetBitContext *s){
645 return show_bits(s, 1);
612476ef
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646}
647
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648static inline void skip_bits1(GetBitContext *s){
649 skip_bits(s, 1);
9dbf9389 650}
612476ef 651
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652void init_get_bits(GetBitContext *s,
653 UINT8 *buffer, int buffer_size);
654
18f77016 655int check_marker(GetBitContext *s, const char *msg);
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656void align_get_bits(GetBitContext *s);
657int init_vlc(VLC *vlc, int nb_bits, int nb_codes,
658 const void *bits, int bits_wrap, int bits_size,
659 const void *codes, int codes_wrap, int codes_size);
660void free_vlc(VLC *vlc);
de6d9b64 661
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662#define GET_VLC(code, name, gb, table, bits, max_depth)\
663{\
664 int n, index, nb_bits;\
665\
666 index= SHOW_UBITS(name, gb, bits);\
667 code = table[index][0];\
668 n = table[index][1];\
669\
670 if(max_depth > 1 && n < 0){\
671 LAST_SKIP_BITS(name, gb, bits)\
672 UPDATE_CACHE(name, gb)\
673\
674 nb_bits = -n;\
cceabc86 675\
6300c80a 676 index= SHOW_UBITS(name, gb, nb_bits) + code;\
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677 code = table[index][0];\
678 n = table[index][1];\
679 if(max_depth > 2 && n < 0){\
680 LAST_SKIP_BITS(name, gb, nb_bits)\
681 UPDATE_CACHE(name, gb)\
682\
683 nb_bits = -n;\
cceabc86 684\
6300c80a 685 index= SHOW_UBITS(name, gb, nb_bits) + code;\
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686 code = table[index][0];\
687 n = table[index][1];\
688 }\
689 }\
690 SKIP_BITS(name, gb, n)\
691}
692
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693#define GET_RL_VLC(level, run, name, gb, table, bits, max_depth)\
694{\
695 int n, index, nb_bits;\
696\
697 index= SHOW_UBITS(name, gb, bits);\
698 level = table[index].level;\
699 n = table[index].len;\
700\
701 if(max_depth > 1 && n < 0){\
702 LAST_SKIP_BITS(name, gb, bits)\
703 UPDATE_CACHE(name, gb)\
704\
705 nb_bits = -n;\
706\
707 index= SHOW_UBITS(name, gb, nb_bits) + level;\
708 level = table[index].level;\
709 n = table[index].len;\
710 }\
711 run= table[index].run;\
712 SKIP_BITS(name, gb, n)\
713}
714
08dce7b0 715// deprecated, dont use get_vlc for new code, use get_vlc2 instead or use GET_VLC directly
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716static inline int get_vlc(GetBitContext *s, VLC *vlc)
717{
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718 int code;
719 VLC_TYPE (*table)[2]= vlc->table;
720
8db1a1dd 721 OPEN_READER(re, s)
8db1a1dd 722 UPDATE_CACHE(re, s)
3587d501 723
cceabc86 724 GET_VLC(code, re, s, table, vlc->bits, 3)
8db1a1dd 725
8db1a1dd 726 CLOSE_READER(re, s)
3587d501 727 return code;
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728}
729
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730static always_inline int get_vlc2(GetBitContext *s, VLC_TYPE (*table)[2],
731 int bits, int max_depth)
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732{
733 int code;
734
735 OPEN_READER(re, s)
736 UPDATE_CACHE(re, s)
737
738 GET_VLC(code, re, s, table, bits, max_depth)
739
740 CLOSE_READER(re, s)
741 return code;
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742}
743
45a82edb 744
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745/* define it to include statistics code (useful only for optimizing
746 codec efficiency */
747//#define STATS
748
749#ifdef STATS
750
751enum {
752 ST_UNKNOWN,
753 ST_DC,
754 ST_INTRA_AC,
755 ST_INTER_AC,
756 ST_INTRA_MB,
757 ST_INTER_MB,
758 ST_MV,
759 ST_NB,
760};
761
762extern int st_current_index;
763extern unsigned int st_bit_counts[ST_NB];
764extern unsigned int st_out_bit_counts[ST_NB];
765
766void print_stats(void);
767#endif
768
769/* misc math functions */
770
a822a479 771static inline int av_log2(unsigned int v)
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772{
773 int n;
774
775 n = 0;
776 if (v & 0xffff0000) {
777 v >>= 16;
778 n += 16;
779 }
780 if (v & 0xff00) {
781 v >>= 8;
782 n += 8;
783 }
784 if (v & 0xf0) {
785 v >>= 4;
786 n += 4;
787 }
788 if (v & 0xc) {
789 v >>= 2;
790 n += 2;
791 }
792 if (v & 0x2) {
793 n++;
794 }
795 return n;
796}
797
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798/* median of 3 */
799static inline int mid_pred(int a, int b, int c)
800{
801 int vmin, vmax;
802 vmax = vmin = a;
803 if (b < vmin)
804 vmin = b;
805 else
806 vmax = b;
807
808 if (c < vmin)
809 vmin = c;
810 else if (c > vmax)
811 vmax = c;
812
813 return a + b + c - vmin - vmax;
814}
815
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816static inline int clip(int a, int amin, int amax)
817{
818 if (a < amin)
819 return amin;
820 else if (a > amax)
821 return amax;
822 else
823 return a;
824}
825
9dbcbd92 826/* math */
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827extern const UINT8 ff_sqrt_tab[128];
828
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829int ff_gcd(int a, int b);
830
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831static inline int ff_sqrt(int a)
832{
833 int ret=0;
834 int s;
835 int ret_sq=0;
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836
837 if(a<128) return ff_sqrt_tab[a];
838
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839 for(s=15; s>=0; s--){
840 int b= ret_sq + (1<<(s*2)) + (ret<<s)*2;
841 if(b<=a){
842 ret_sq=b;
843 ret+= 1<<s;
844 }
845 }
846 return ret;
847}
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848
849/**
850 * converts fourcc string to int
851 */
6a85ec8d 852static inline int ff_get_fourcc(const char *s){
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853 assert( strlen(s)==4 );
854
855 return (s[0]) + (s[1]<<8) + (s[2]<<16) + (s[3]<<24);
856}
857
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858void ff_float2fraction(int *nom_arg, int *denom_arg, double f, int max);
859
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860
861#ifdef ARCH_X86
862#define MASK_ABS(mask, level)\
863 asm volatile(\
864 "cdq \n\t"\
865 "xorl %1, %0 \n\t"\
866 "subl %1, %0 \n\t"\
867 : "+a" (level), "=&d" (mask)\
868 );
869#else
870#define MASK_ABS(mask, level)\
871 mask= level>>31;\
872 level= (level^mask)-mask;
873#endif
874
875
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876#if __CPU__ >= 686 && !defined(RUNTIME_CPUDETECT)
877#define COPY3_IF_LT(x,y,a,b,c,d)\
878asm volatile (\
879 "cmpl %0, %3 \n\t"\
880 "cmovl %3, %0 \n\t"\
881 "cmovl %4, %1 \n\t"\
882 "cmovl %5, %2 \n\t"\
883 : "+r" (x), "+r" (a), "+r" (c)\
884 : "r" (y), "r" (b), "r" (d)\
885);
886#else
887#define COPY3_IF_LT(x,y,a,b,c,d)\
888if((y)<(x)){\
889 (x)=(y);\
890 (a)=(b);\
891 (c)=(d);\
892}
893#endif
894
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895#define CLAMP_TO_8BIT(d) ((d > 0xff) ? 0xff : (d < 0) ? 0 : d)
896
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897#endif /* HAVE_AV_CONFIG_H */
898
899#endif /* COMMON_H */