Statistics
| Branch: | Revision:

ffmpeg / libavcodec / common.h @ 365e75f8

History | View | Annotate | Download (31.2 KB)

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
#define LIBMPEG2_BITSTREAM_READER_HACK //add BERO
20

    
21
#ifndef M_PI
22
#define M_PI    3.14159265358979323846
23
#endif
24

    
25
#ifdef HAVE_AV_CONFIG_H
26
/* only include the following when compiling package */
27
#    include "config.h"
28

    
29
#    include <stdlib.h>
30
#    include <stdio.h>
31
#    include <string.h>
32
#    include <ctype.h>
33
#    ifndef __BEOS__
34
#        include <errno.h>
35
#    else
36
#        include "berrno.h"
37
#    endif
38
#    include <math.h>
39

    
40
#    ifndef ENODATA
41
#        define ENODATA  61
42
#    endif
43

    
44
#include <stddef.h>
45
#ifndef offsetof
46
# define offsetof(T,F) ((unsigned int)((char *)&((T *)0)->F))
47
#endif
48

    
49
#define AVOPTION_CODEC_BOOL(name, help, field) \
50
    { name, help, offsetof(AVCodecContext, field), FF_OPT_TYPE_BOOL }
51
#define AVOPTION_CODEC_DOUBLE(name, help, field, minv, maxv, defval) \
52
    { name, help, offsetof(AVCodecContext, field), FF_OPT_TYPE_DOUBLE, minv, maxv, defval }
53
#define AVOPTION_CODEC_FLAG(name, help, field, flag, defval) \
54
    { name, help, offsetof(AVCodecContext, field), FF_OPT_TYPE_FLAG, flag, 0, defval }
55
#define AVOPTION_CODEC_INT(name, help, field, minv, maxv, defval) \
56
    { name, help, offsetof(AVCodecContext, field), FF_OPT_TYPE_INT, minv, maxv, defval }
57
#define AVOPTION_CODEC_STRING(name, help, field, str, val) \
58
    { name, help, offsetof(AVCodecContext, field), FF_OPT_TYPE_STRING, .defval = val, .defstr = str }
59
#define AVOPTION_CODEC_RCOVERRIDE(name, help, field) \
60
    { name, help, offsetof(AVCodecContext, field), FF_OPT_TYPE_RCOVERRIDE, .defval = 0, .defstr = NULL }
61
#define AVOPTION_SUB(ptr) { .name = NULL, .help = (const char*)ptr }
62
#define AVOPTION_END() AVOPTION_SUB(NULL)
63

    
64
struct AVOption;
65
#ifdef HAVE_MMX
66
extern const struct AVOption avoptions_common[3 + 5];
67
#else
68
extern const struct AVOption avoptions_common[3];
69
#endif
70
extern const struct AVOption avoptions_workaround_bug[11];
71

    
72
#endif /* HAVE_AV_CONFIG_H */
73

    
74
/* Suppress restrict if it was not defined in config.h.  */
75
#ifndef restrict
76
#    define restrict
77
#endif
78

    
79
#if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
80
#    define always_inline __attribute__((always_inline)) inline
81
#else
82
#    define always_inline inline
83
#endif
84

    
85
#if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
86
#    define attribute_used __attribute__((used))
87
#else
88
#    define attribute_used
89
#endif
90

    
91
#ifndef EMULATE_INTTYPES
92
#   include <inttypes.h>
93
#else
94
    typedef signed char  int8_t;
95
    typedef signed short int16_t;
96
    typedef signed int   int32_t;
97
    typedef unsigned char  uint8_t;
98
    typedef unsigned short uint16_t;
99
    typedef unsigned int   uint32_t;
100

    
101
#   ifdef CONFIG_WIN32
102
        typedef signed __int64   int64_t;
103
        typedef unsigned __int64 uint64_t;
104
#   else /* other OS */
105
        typedef signed long long   int64_t;
106
        typedef unsigned long long uint64_t;
107
#   endif /* other OS */
108
#endif /* HAVE_INTTYPES_H */
109

    
110
#ifndef INT64_MAX
111
#define INT64_MAX int64_t_C(9223372036854775807)
112
#endif
113

    
114
#ifdef EMULATE_FAST_INT
115
/* note that we don't emulate 64bit ints */
116
typedef signed char int_fast8_t;
117
typedef signed int  int_fast16_t;
118
typedef signed int  int_fast32_t;
119
typedef unsigned char uint_fast8_t;
120
typedef unsigned int  uint_fast16_t;
121
typedef unsigned int  uint_fast32_t;
122
#endif
123

    
124
#if defined(CONFIG_OS2) || defined(CONFIG_SUNOS)
125
static inline float floorf(float f) { 
126
    return floor(f); 
127
}
128
#endif
129

    
130
#ifdef CONFIG_WIN32
131

    
132
/* windows */
133

    
134
#    ifndef __MINGW32__
135
#        define int64_t_C(c)     (c ## i64)
136
#        define uint64_t_C(c)    (c ## i64)
137

    
138
#    ifdef HAVE_AV_CONFIG_H
139
#            define inline __inline
140
#    endif
141

    
142
#    else
143
#        define int64_t_C(c)     (c ## LL)
144
#        define uint64_t_C(c)    (c ## ULL)
145
#    endif /* __MINGW32__ */
146

    
147
#    ifdef HAVE_AV_CONFIG_H
148
#        ifdef _DEBUG
149
#            define DEBUG
150
#        endif
151

    
152
#        define snprintf _snprintf
153
#        define vsnprintf _vsnprintf
154
#    endif
155

    
156
/* CONFIG_WIN32 end */
157
#elif defined (CONFIG_OS2)
158
/* OS/2 EMX */
159

    
160
#ifndef int64_t_C
161
#define int64_t_C(c)     (c ## LL)
162
#define uint64_t_C(c)    (c ## ULL)
163
#endif
164

    
165
#ifdef HAVE_AV_CONFIG_H
166

    
167
#ifdef USE_FASTMEMCPY
168
#include "fastmemcpy.h"
169
#endif
170

    
171
#include <float.h>
172

    
173
#endif /* HAVE_AV_CONFIG_H */
174

    
175
/* CONFIG_OS2 end */
176
#else
177

    
178
/* unix */
179

    
180
#ifndef int64_t_C
181
#define int64_t_C(c)     (c ## LL)
182
#define uint64_t_C(c)    (c ## ULL)
183
#endif
184

    
185
#ifdef HAVE_AV_CONFIG_H
186

    
187
#        ifdef USE_FASTMEMCPY
188
#            include "fastmemcpy.h"
189
#        endif
190
#    endif /* HAVE_AV_CONFIG_H */
191

    
192
#endif /* !CONFIG_WIN32 && !CONFIG_OS2 */
193

    
194
#ifdef HAVE_AV_CONFIG_H
195

    
196
#    include "bswap.h"
197

    
198
#    if defined(__MINGW32__) || defined(__CYGWIN__) || \
199
        defined(__OS2__) || (defined (__OpenBSD__) && !defined(__ELF__))
200
#        define MANGLE(a) "_" #a
201
#    else
202
#        define MANGLE(a) #a
203
#    endif
204

    
205
/* debug stuff */
206

    
207
#    ifndef DEBUG
208
#        define NDEBUG
209
#    endif
210
#    include <assert.h>
211

    
212
/* dprintf macros */
213
#    if defined(CONFIG_WIN32) && !defined(__MINGW32__)
214

    
215
inline void dprintf(const char* fmt,...) {}
216

    
217
#    else
218

    
219
#        ifdef DEBUG
220
#            define dprintf(fmt,...) av_log(NULL, AV_LOG_DEBUG, fmt, __VA_ARGS__)
221
#        else
222
#            define dprintf(fmt,...)
223
#        endif
224

    
225
#    endif /* !CONFIG_WIN32 */
226

    
227
#    define av_abort()      do { av_log(NULL, AV_LOG_ERROR, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)
228

    
229
//rounded divison & shift
230
#define RSHIFT(a,b) ((a) > 0 ? ((a) + (1<<((b)-1)))>>(b) : ((a) + (1<<((b)-1))-1)>>(b))
231
/* assume b>0 */
232
#define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
233
#define ABS(a) ((a) >= 0 ? (a) : (-(a)))
234

    
235
#define FFMAX(a,b) ((a) > (b) ? (a) : (b))
236
#define FFMIN(a,b) ((a) > (b) ? (b) : (a))
237

    
238
extern const uint32_t inverse[256];
239

    
240
#ifdef ARCH_X86
241
#    define FASTDIV(a,b) \
242
    ({\
243
        int ret,dmy;\
244
        asm volatile(\
245
            "mull %3"\
246
            :"=d"(ret),"=a"(dmy)\
247
            :"1"(a),"g"(inverse[b])\
248
            );\
249
        ret;\
250
    })
251
#elif defined(CONFIG_FASTDIV)
252
#    define FASTDIV(a,b)   ((uint32_t)((((uint64_t)a)*inverse[b])>>32))
253
#else
254
#    define FASTDIV(a,b)   ((a)/(b))
255
#endif
256
 
257
#ifdef ARCH_X86
258
// avoid +32 for shift optimization (gcc should do that ...)
259
static inline  int32_t NEG_SSR32( int32_t a, int8_t s){
260
    asm ("sarl %1, %0\n\t"
261
         : "+r" (a)
262
         : "ic" ((uint8_t)(-s))
263
    );
264
    return a;
265
}
266
static inline uint32_t NEG_USR32(uint32_t a, int8_t s){
267
    asm ("shrl %1, %0\n\t"
268
         : "+r" (a)
269
         : "ic" ((uint8_t)(-s))
270
    );
271
    return a;
272
}
273
#else
274
#    define NEG_SSR32(a,s) ((( int32_t)(a))>>(32-(s)))
275
#    define NEG_USR32(a,s) (((uint32_t)(a))>>(32-(s)))
276
#endif
277

    
278
/* bit output */
279

    
280
struct PutBitContext;
281

    
282
typedef void (*WriteDataFunc)(void *, uint8_t *, int);
283

    
284
/* buf and buf_end must be present and used by every alternative writer. */
285
typedef struct PutBitContext {
286
#ifdef ALT_BITSTREAM_WRITER
287
    uint8_t *buf, *buf_end;
288
    int index;
289
#else
290
    uint32_t bit_buf;
291
    int bit_left;
292
    uint8_t *buf, *buf_ptr, *buf_end;
293
#endif
294
} PutBitContext;
295

    
296
static inline void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
297
{
298
    s->buf = buffer;
299
    s->buf_end = s->buf + buffer_size;
300
#ifdef ALT_BITSTREAM_WRITER
301
    s->index=0;
302
    ((uint32_t*)(s->buf))[0]=0;
303
//    memset(buffer, 0, buffer_size);
304
#else
305
    s->buf_ptr = s->buf;
306
    s->bit_left=32;
307
    s->bit_buf=0;
308
#endif
309
}
310

    
311
/* return the number of bits output */
312
static inline int put_bits_count(PutBitContext *s)
313
{
314
#ifdef ALT_BITSTREAM_WRITER
315
    return s->index;
316
#else
317
    return (s->buf_ptr - s->buf) * 8 + 32 - s->bit_left;
318
#endif
319
}
320

    
321
/* pad the end of the output stream with zeros */
322
static inline void flush_put_bits(PutBitContext *s)
323
{
324
#ifdef ALT_BITSTREAM_WRITER
325
    align_put_bits(s);
326
#else
327
    s->bit_buf<<= s->bit_left;
328
    while (s->bit_left < 32) {
329
        /* XXX: should test end of buffer */
330
        *s->buf_ptr++=s->bit_buf >> 24;
331
        s->bit_buf<<=8;
332
        s->bit_left+=8;
333
    }
334
    s->bit_left=32;
335
    s->bit_buf=0;
336
#endif
337
}
338

    
339
void align_put_bits(PutBitContext *s);
340
void put_string(PutBitContext * pbc, char *s, int put_zero);
341

    
342
/* bit input */
343
/* buffer, buffer_end and size_in_bits must be present and used by every reader */
344
typedef struct GetBitContext {
345
    const uint8_t *buffer, *buffer_end;
346
#ifdef ALT_BITSTREAM_READER
347
    int index;
348
#elif defined LIBMPEG2_BITSTREAM_READER
349
    uint8_t *buffer_ptr;
350
    uint32_t cache;
351
    int bit_count;
352
#elif defined A32_BITSTREAM_READER
353
    uint32_t *buffer_ptr;
354
    uint32_t cache0;
355
    uint32_t cache1;
356
    int bit_count;
357
#endif
358
    int size_in_bits;
359
} GetBitContext;
360

    
361
#define VLC_TYPE int16_t
362

    
363
typedef struct VLC {
364
    int bits;
365
    VLC_TYPE (*table)[2]; ///< code, bits
366
    int table_size, table_allocated;
367
} VLC;
368

    
369
typedef struct RL_VLC_ELEM {
370
    int16_t level;
371
    int8_t len;
372
    uint8_t run;
373
} RL_VLC_ELEM;
374

    
375
#ifdef ARCH_SPARC64
376
#define UNALIGNED_STORES_ARE_BAD
377
#endif
378

    
379
/* used to avoid missaligned exceptions on some archs (alpha, ...) */
380
#ifdef ARCH_X86
381
#    define unaligned32(a) (*(uint32_t*)(a))
382
#else
383
#    ifdef __GNUC__
384
static inline uint32_t unaligned32(const void *v) {
385
    struct Unaligned {
386
        uint32_t i;
387
    } __attribute__((packed));
388

    
389
    return ((const struct Unaligned *) v)->i;
390
}
391
#    elif defined(__DECC)
392
static inline uint32_t unaligned32(const void *v) {
393
    return *(const __unaligned uint32_t *) v;
394
}
395
#    else
396
static inline uint32_t unaligned32(const void *v) {
397
    return *(const uint32_t *) v;
398
}
399
#    endif
400
#endif //!ARCH_X86
401

    
402
#ifndef ALT_BITSTREAM_WRITER
403
static inline void put_bits(PutBitContext *s, int n, unsigned int value)
404
{
405
    unsigned int bit_buf;
406
    int bit_left;
407

    
408
#ifdef STATS
409
    st_out_bit_counts[st_current_index] += n;
410
#endif
411
    //    printf("put_bits=%d %x\n", n, value);
412
    assert(n == 32 || value < (1U << n));
413
    
414
    bit_buf = s->bit_buf;
415
    bit_left = s->bit_left;
416

    
417
    //    printf("n=%d value=%x cnt=%d buf=%x\n", n, value, bit_cnt, bit_buf);
418
    /* XXX: optimize */
419
    if (n < bit_left) {
420
        bit_buf = (bit_buf<<n) | value;
421
        bit_left-=n;
422
    } else {
423
        bit_buf<<=bit_left;
424
        bit_buf |= value >> (n - bit_left);
425
#ifdef UNALIGNED_STORES_ARE_BAD
426
        if (3 & (int) s->buf_ptr) {
427
            s->buf_ptr[0] = bit_buf >> 24;
428
            s->buf_ptr[1] = bit_buf >> 16;
429
            s->buf_ptr[2] = bit_buf >>  8;
430
            s->buf_ptr[3] = bit_buf      ;
431
        } else
432
#endif
433
        *(uint32_t *)s->buf_ptr = be2me_32(bit_buf);
434
        //printf("bitbuf = %08x\n", bit_buf);
435
        s->buf_ptr+=4;
436
        bit_left+=32 - n;
437
        bit_buf = value;
438
    }
439

    
440
    s->bit_buf = bit_buf;
441
    s->bit_left = bit_left;
442
}
443
#endif
444

    
445

    
446
#ifdef ALT_BITSTREAM_WRITER
447
static inline void put_bits(PutBitContext *s, int n, unsigned int value)
448
{
449
#    ifdef ALIGNED_BITSTREAM_WRITER
450
#        ifdef ARCH_X86
451
    asm volatile(
452
        "movl %0, %%ecx                        \n\t"
453
        "xorl %%eax, %%eax                \n\t"
454
        "shrdl %%cl, %1, %%eax                \n\t"
455
        "shrl %%cl, %1                        \n\t"
456
        "movl %0, %%ecx                        \n\t"
457
        "shrl $3, %%ecx                        \n\t"
458
        "andl $0xFFFFFFFC, %%ecx        \n\t"
459
        "bswapl %1                        \n\t"
460
        "orl %1, (%2, %%ecx)                \n\t"
461
        "bswapl %%eax                        \n\t"
462
        "addl %3, %0                        \n\t"
463
        "movl %%eax, 4(%2, %%ecx)        \n\t"
464
        : "=&r" (s->index), "=&r" (value)
465
        : "r" (s->buf), "r" (n), "0" (s->index), "1" (value<<(-n))
466
        : "%eax", "%ecx"
467
    );
468
#        else
469
    int index= s->index;
470
    uint32_t *ptr= ((uint32_t *)s->buf)+(index>>5);
471
    
472
    value<<= 32-n; 
473
    
474
    ptr[0] |= be2me_32(value>>(index&31));
475
    ptr[1]  = be2me_32(value<<(32-(index&31)));
476
//if(n>24) printf("%d %d\n", n, value);
477
    index+= n;
478
    s->index= index;
479
#        endif
480
#    else //ALIGNED_BITSTREAM_WRITER
481
#        ifdef ARCH_X86
482
    asm volatile(
483
        "movl $7, %%ecx                        \n\t"
484
        "andl %0, %%ecx                        \n\t"
485
        "addl %3, %%ecx                        \n\t"
486
        "negl %%ecx                        \n\t"
487
        "shll %%cl, %1                        \n\t"
488
        "bswapl %1                        \n\t"
489
        "movl %0, %%ecx                        \n\t"
490
        "shrl $3, %%ecx                        \n\t"
491
        "orl %1, (%%ecx, %2)                \n\t"
492
        "addl %3, %0                        \n\t"
493
        "movl $0, 4(%%ecx, %2)                \n\t"
494
        : "=&r" (s->index), "=&r" (value)
495
        : "r" (s->buf), "r" (n), "0" (s->index), "1" (value)
496
        : "%ecx"
497
    );
498
#        else
499
    int index= s->index;
500
    uint32_t *ptr= (uint32_t*)(((uint8_t *)s->buf)+(index>>3));
501
    
502
    ptr[0] |= be2me_32(value<<(32-n-(index&7) ));
503
    ptr[1] = 0;
504
//if(n>24) printf("%d %d\n", n, value);
505
    index+= n;
506
    s->index= index;
507
#        endif
508
#    endif //!ALIGNED_BITSTREAM_WRITER
509
}
510
#endif
511

    
512

    
513
static inline uint8_t* pbBufPtr(PutBitContext *s)
514
{
515
#ifdef ALT_BITSTREAM_WRITER
516
        return s->buf + (s->index>>3);
517
#else
518
        return s->buf_ptr;
519
#endif
520
}
521

    
522
/**
523
 *
524
 * PutBitContext must be flushed & aligned to a byte boundary before calling this.
525
 */
526
static inline void skip_put_bytes(PutBitContext *s, int n){
527
        assert((put_bits_count(s)&7)==0);
528
#ifdef ALT_BITSTREAM_WRITER
529
        FIXME may need some cleaning of the buffer
530
        s->index += n<<3;
531
#else
532
        assert(s->bit_left==32);
533
        s->buf_ptr += n;
534
#endif    
535
}
536

    
537
/**
538
 * Changes the end of the buffer.
539
 */
540
static inline void set_put_bits_buffer_size(PutBitContext *s, int size){
541
    s->buf_end= s->buf + size;
542
}
543

    
544
/* Bitstream reader API docs:
545
name
546
    abritary name which is used as prefix for the internal variables
547

548
gb
549
    getbitcontext
550

551
OPEN_READER(name, gb)
552
    loads gb into local variables
553

554
CLOSE_READER(name, gb)
555
    stores local vars in gb
556

557
UPDATE_CACHE(name, gb)
558
    refills the internal cache from the bitstream
559
    after this call at least MIN_CACHE_BITS will be available,
560

561
GET_CACHE(name, gb)
562
    will output the contents of the internal cache, next bit is MSB of 32 or 64 bit (FIXME 64bit)
563

564
SHOW_UBITS(name, gb, num)
565
    will return the nest num bits
566

567
SHOW_SBITS(name, gb, num)
568
    will return the nest num bits and do sign extension
569

570
SKIP_BITS(name, gb, num)
571
    will skip over the next num bits
572
    note, this is equinvalent to SKIP_CACHE; SKIP_COUNTER
573

574
SKIP_CACHE(name, gb, num)
575
    will remove the next num bits from the cache (note SKIP_COUNTER MUST be called before UPDATE_CACHE / CLOSE_READER)
576

577
SKIP_COUNTER(name, gb, num)
578
    will increment the internal bit counter (see SKIP_CACHE & SKIP_BITS)
579

580
LAST_SKIP_CACHE(name, gb, num)
581
    will remove the next num bits from the cache if it is needed for UPDATE_CACHE otherwise it will do nothing
582

583
LAST_SKIP_BITS(name, gb, num)
584
    is equinvalent to SKIP_LAST_CACHE; SKIP_COUNTER
585

586
for examples see get_bits, show_bits, skip_bits, get_vlc
587
*/
588

    
589
static inline int unaligned32_be(const void *v)
590
{
591
#ifdef CONFIG_ALIGN
592
        const uint8_t *p=v;
593
        return (((p[0]<<8) | p[1])<<16) | (p[2]<<8) | (p[3]);
594
#else
595
        return be2me_32( unaligned32(v)); //original
596
#endif
597
}
598

    
599
#ifdef ALT_BITSTREAM_READER
600
#   define MIN_CACHE_BITS 25
601

    
602
#   define OPEN_READER(name, gb)\
603
        int name##_index= (gb)->index;\
604
        int name##_cache= 0;\
605

    
606
#   define CLOSE_READER(name, gb)\
607
        (gb)->index= name##_index;\
608

    
609
#   define UPDATE_CACHE(name, gb)\
610
        name##_cache= unaligned32_be( ((uint8_t *)(gb)->buffer)+(name##_index>>3) ) << (name##_index&0x07);\
611

    
612
#   define SKIP_CACHE(name, gb, num)\
613
        name##_cache <<= (num);\
614

    
615
// FIXME name?
616
#   define SKIP_COUNTER(name, gb, num)\
617
        name##_index += (num);\
618

    
619
#   define SKIP_BITS(name, gb, num)\
620
        {\
621
            SKIP_CACHE(name, gb, num)\
622
            SKIP_COUNTER(name, gb, num)\
623
        }\
624

    
625
#   define LAST_SKIP_BITS(name, gb, num) SKIP_COUNTER(name, gb, num)
626
#   define LAST_SKIP_CACHE(name, gb, num) ;
627

    
628
#   define SHOW_UBITS(name, gb, num)\
629
        NEG_USR32(name##_cache, num)
630

    
631
#   define SHOW_SBITS(name, gb, num)\
632
        NEG_SSR32(name##_cache, num)
633

    
634
#   define GET_CACHE(name, gb)\
635
        ((uint32_t)name##_cache)
636

    
637
static inline int get_bits_count(GetBitContext *s){
638
    return s->index;
639
}
640
#elif defined LIBMPEG2_BITSTREAM_READER
641
//libmpeg2 like reader
642

    
643
#   define MIN_CACHE_BITS 17
644

    
645
#   define OPEN_READER(name, gb)\
646
        int name##_bit_count=(gb)->bit_count;\
647
        int name##_cache= (gb)->cache;\
648
        uint8_t * name##_buffer_ptr=(gb)->buffer_ptr;\
649

    
650
#   define CLOSE_READER(name, gb)\
651
        (gb)->bit_count= name##_bit_count;\
652
        (gb)->cache= name##_cache;\
653
        (gb)->buffer_ptr= name##_buffer_ptr;\
654

    
655
#ifdef LIBMPEG2_BITSTREAM_READER_HACK
656

    
657
#   define UPDATE_CACHE(name, gb)\
658
    if(name##_bit_count >= 0){\
659
        name##_cache+= (int)be2me_16(*(uint16_t*)name##_buffer_ptr) << name##_bit_count;\
660
        ((uint16_t*)name##_buffer_ptr)++;\
661
        name##_bit_count-= 16;\
662
    }\
663

    
664
#else
665

    
666
#   define UPDATE_CACHE(name, gb)\
667
    if(name##_bit_count >= 0){\
668
        name##_cache+= ((name##_buffer_ptr[0]<<8) + name##_buffer_ptr[1]) << name##_bit_count;\
669
        name##_buffer_ptr+=2;\
670
        name##_bit_count-= 16;\
671
    }\
672

    
673
#endif
674

    
675
#   define SKIP_CACHE(name, gb, num)\
676
        name##_cache <<= (num);\
677

    
678
#   define SKIP_COUNTER(name, gb, num)\
679
        name##_bit_count += (num);\
680

    
681
#   define SKIP_BITS(name, gb, num)\
682
        {\
683
            SKIP_CACHE(name, gb, num)\
684
            SKIP_COUNTER(name, gb, num)\
685
        }\
686

    
687
#   define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num)
688
#   define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num)
689

    
690
#   define SHOW_UBITS(name, gb, num)\
691
        NEG_USR32(name##_cache, num)
692

    
693
#   define SHOW_SBITS(name, gb, num)\
694
        NEG_SSR32(name##_cache, num)
695

    
696
#   define GET_CACHE(name, gb)\
697
        ((uint32_t)name##_cache)
698

    
699
static inline int get_bits_count(GetBitContext *s){
700
    return (s->buffer_ptr - s->buffer)*8 - 16 + s->bit_count;
701
}
702

    
703
#elif defined A32_BITSTREAM_READER
704

    
705
#   define MIN_CACHE_BITS 32
706

    
707
#   define OPEN_READER(name, gb)\
708
        int name##_bit_count=(gb)->bit_count;\
709
        uint32_t name##_cache0= (gb)->cache0;\
710
        uint32_t name##_cache1= (gb)->cache1;\
711
        uint32_t * name##_buffer_ptr=(gb)->buffer_ptr;\
712

    
713
#   define CLOSE_READER(name, gb)\
714
        (gb)->bit_count= name##_bit_count;\
715
        (gb)->cache0= name##_cache0;\
716
        (gb)->cache1= name##_cache1;\
717
        (gb)->buffer_ptr= name##_buffer_ptr;\
718

    
719
#   define UPDATE_CACHE(name, gb)\
720
    if(name##_bit_count > 0){\
721
        const uint32_t next= be2me_32( *name##_buffer_ptr );\
722
        name##_cache0 |= NEG_USR32(next,name##_bit_count);\
723
        name##_cache1 |= next<<name##_bit_count;\
724
        name##_buffer_ptr++;\
725
        name##_bit_count-= 32;\
726
    }\
727

    
728
#ifdef ARCH_X86
729
#   define SKIP_CACHE(name, gb, num)\
730
        asm(\
731
            "shldl %2, %1, %0                \n\t"\
732
            "shll %2, %1                \n\t"\
733
            : "+r" (name##_cache0), "+r" (name##_cache1)\
734
            : "Ic" ((uint8_t)num)\
735
           );
736
#else
737
#   define SKIP_CACHE(name, gb, num)\
738
        name##_cache0 <<= (num);\
739
        name##_cache0 |= NEG_USR32(name##_cache1,num);\
740
        name##_cache1 <<= (num);
741
#endif
742

    
743
#   define SKIP_COUNTER(name, gb, num)\
744
        name##_bit_count += (num);\
745

    
746
#   define SKIP_BITS(name, gb, num)\
747
        {\
748
            SKIP_CACHE(name, gb, num)\
749
            SKIP_COUNTER(name, gb, num)\
750
        }\
751

    
752
#   define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num)
753
#   define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num)
754

    
755
#   define SHOW_UBITS(name, gb, num)\
756
        NEG_USR32(name##_cache0, num)
757

    
758
#   define SHOW_SBITS(name, gb, num)\
759
        NEG_SSR32(name##_cache0, num)
760

    
761
#   define GET_CACHE(name, gb)\
762
        (name##_cache0)
763

    
764
static inline int get_bits_count(GetBitContext *s){
765
    return ((uint8_t*)s->buffer_ptr - s->buffer)*8 - 32 + s->bit_count;
766
}
767

    
768
#endif
769

    
770
/**
771
 * read mpeg1 dc style vlc (sign bit + mantisse with no MSB).
772
 * if MSB not set it is negative 
773
 * @param n length in bits
774
 * @author BERO  
775
 */
776
static inline int get_xbits(GetBitContext *s, int n){
777
    register int tmp;
778
    register int32_t cache;
779
    OPEN_READER(re, s)
780
    UPDATE_CACHE(re, s)
781
    cache = GET_CACHE(re,s);
782
    if ((int32_t)cache<0) { //MSB=1
783
        tmp = NEG_USR32(cache,n);
784
    } else {
785
    //   tmp = (-1<<n) | NEG_USR32(cache,n) + 1; mpeg12.c algo
786
    //   tmp = - (NEG_USR32(cache,n) ^ ((1 << n) - 1)); h263.c algo
787
        tmp = - NEG_USR32(~cache,n);
788
    }
789
    LAST_SKIP_BITS(re, s, n)
790
    CLOSE_READER(re, s)
791
    return tmp;
792
}
793

    
794
static inline int get_sbits(GetBitContext *s, int n){
795
    register int tmp;
796
    OPEN_READER(re, s)
797
    UPDATE_CACHE(re, s)
798
    tmp= SHOW_SBITS(re, s, n);
799
    LAST_SKIP_BITS(re, s, n)
800
    CLOSE_READER(re, s)
801
    return tmp;
802
}
803

    
804
/**
805
 * reads 0-17 bits.
806
 * Note, the alt bitstream reader can read upto 25 bits, but the libmpeg2 reader cant
807
 */
808
static inline unsigned int get_bits(GetBitContext *s, int n){
809
    register int tmp;
810
    OPEN_READER(re, s)
811
    UPDATE_CACHE(re, s)
812
    tmp= SHOW_UBITS(re, s, n);
813
    LAST_SKIP_BITS(re, s, n)
814
    CLOSE_READER(re, s)
815
    return tmp;
816
}
817

    
818
unsigned int get_bits_long(GetBitContext *s, int n);
819

    
820
/**
821
 * shows 0-17 bits.
822
 * Note, the alt bitstream reader can read upto 25 bits, but the libmpeg2 reader cant
823
 */
824
static inline unsigned int show_bits(GetBitContext *s, int n){
825
    register int tmp;
826
    OPEN_READER(re, s)
827
    UPDATE_CACHE(re, s)
828
    tmp= SHOW_UBITS(re, s, n);
829
//    CLOSE_READER(re, s)
830
    return tmp;
831
}
832

    
833
unsigned int show_bits_long(GetBitContext *s, int n);
834

    
835
static inline void skip_bits(GetBitContext *s, int n){
836
 //Note gcc seems to optimize this to s->index+=n for the ALT_READER :))
837
    OPEN_READER(re, s)
838
    UPDATE_CACHE(re, s)
839
    LAST_SKIP_BITS(re, s, n)
840
    CLOSE_READER(re, s)
841
}
842

    
843
static inline unsigned int get_bits1(GetBitContext *s){
844
#ifdef ALT_BITSTREAM_READER
845
    int index= s->index;
846
    uint8_t result= s->buffer[ index>>3 ];
847
    result<<= (index&0x07);
848
    result>>= 8 - 1;
849
    index++;
850
    s->index= index;
851

    
852
    return result;
853
#else
854
    return get_bits(s, 1);
855
#endif
856
}
857

    
858
static inline unsigned int show_bits1(GetBitContext *s){
859
    return show_bits(s, 1);
860
}
861

    
862
static inline void skip_bits1(GetBitContext *s){
863
    skip_bits(s, 1);
864
}
865

    
866
/**
867
 * init GetBitContext.
868
 * @param buffer bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE bytes larger then the actual read bits
869
 * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
870
 * @param bit_size the size of the buffer in bits
871
 */
872
static inline void init_get_bits(GetBitContext *s,
873
                   const uint8_t *buffer, int bit_size)
874
{
875
    const int buffer_size= (bit_size+7)>>3;
876

    
877
    s->buffer= buffer;
878
    s->size_in_bits= bit_size;
879
    s->buffer_end= buffer + buffer_size;
880
#ifdef ALT_BITSTREAM_READER
881
    s->index=0;
882
#elif defined LIBMPEG2_BITSTREAM_READER
883
#ifdef LIBMPEG2_BITSTREAM_READER_HACK
884
  if ((int)buffer&1) {
885
     /* word alignment */
886
    s->cache = (*buffer++)<<24;
887
    s->buffer_ptr = buffer;
888
    s->bit_count = 16-8;
889
  } else
890
#endif
891
  {
892
    s->buffer_ptr = buffer;
893
    s->bit_count = 16;
894
    s->cache = 0;
895
  }
896
#elif defined A32_BITSTREAM_READER
897
    s->buffer_ptr = (uint32_t*)buffer;
898
    s->bit_count = 32;
899
    s->cache0 = 0;
900
    s->cache1 = 0;
901
#endif
902
    {
903
        OPEN_READER(re, s)
904
        UPDATE_CACHE(re, s)
905
        UPDATE_CACHE(re, s)
906
        CLOSE_READER(re, s)
907
    }
908
#ifdef A32_BITSTREAM_READER
909
    s->cache1 = 0;
910
#endif
911
}
912

    
913
int check_marker(GetBitContext *s, const char *msg);
914
void align_get_bits(GetBitContext *s);
915
int init_vlc(VLC *vlc, int nb_bits, int nb_codes,
916
             const void *bits, int bits_wrap, int bits_size,
917
             const void *codes, int codes_wrap, int codes_size);
918
void free_vlc(VLC *vlc);
919

    
920
/**
921
 *
922
 * if the vlc code is invalid and max_depth=1 than no bits will be removed
923
 * if the vlc code is invalid and max_depth>1 than the number of bits removed
924
 * is undefined
925
 */
926
#define GET_VLC(code, name, gb, table, bits, max_depth)\
927
{\
928
    int n, index, nb_bits;\
929
\
930
    index= SHOW_UBITS(name, gb, bits);\
931
    code = table[index][0];\
932
    n    = table[index][1];\
933
\
934
    if(max_depth > 1 && n < 0){\
935
        LAST_SKIP_BITS(name, gb, bits)\
936
        UPDATE_CACHE(name, gb)\
937
\
938
        nb_bits = -n;\
939
\
940
        index= SHOW_UBITS(name, gb, nb_bits) + code;\
941
        code = table[index][0];\
942
        n    = table[index][1];\
943
        if(max_depth > 2 && n < 0){\
944
            LAST_SKIP_BITS(name, gb, nb_bits)\
945
            UPDATE_CACHE(name, gb)\
946
\
947
            nb_bits = -n;\
948
\
949
            index= SHOW_UBITS(name, gb, nb_bits) + code;\
950
            code = table[index][0];\
951
            n    = table[index][1];\
952
        }\
953
    }\
954
    SKIP_BITS(name, gb, n)\
955
}
956

    
957
#define GET_RL_VLC(level, run, name, gb, table, bits, max_depth)\
958
{\
959
    int n, index, nb_bits;\
960
\
961
    index= SHOW_UBITS(name, gb, bits);\
962
    level = table[index].level;\
963
    n     = table[index].len;\
964
\
965
    if(max_depth > 1 && n < 0){\
966
        LAST_SKIP_BITS(name, gb, bits)\
967
        UPDATE_CACHE(name, gb)\
968
\
969
        nb_bits = -n;\
970
\
971
        index= SHOW_UBITS(name, gb, nb_bits) + level;\
972
        level = table[index].level;\
973
        n     = table[index].len;\
974
    }\
975
    run= table[index].run;\
976
    SKIP_BITS(name, gb, n)\
977
}
978

    
979
// deprecated, dont use get_vlc for new code, use get_vlc2 instead or use GET_VLC directly
980
static inline int get_vlc(GetBitContext *s, VLC *vlc)
981
{
982
    int code;
983
    VLC_TYPE (*table)[2]= vlc->table;
984
    
985
    OPEN_READER(re, s)
986
    UPDATE_CACHE(re, s)
987

    
988
    GET_VLC(code, re, s, table, vlc->bits, 3)    
989

    
990
    CLOSE_READER(re, s)
991
    return code;
992
}
993

    
994
/**
995
 * parses a vlc code, faster then get_vlc()
996
 * @param bits is the number of bits which will be read at once, must be 
997
 *             identical to nb_bits in init_vlc()
998
 * @param max_depth is the number of times bits bits must be readed to completly
999
 *                  read the longest vlc code 
1000
 *                  = (max_vlc_length + bits - 1) / bits
1001
 */
1002
static always_inline int get_vlc2(GetBitContext *s, VLC_TYPE (*table)[2],
1003
                                  int bits, int max_depth)
1004
{
1005
    int code;
1006
    
1007
    OPEN_READER(re, s)
1008
    UPDATE_CACHE(re, s)
1009

    
1010
    GET_VLC(code, re, s, table, bits, max_depth)
1011

    
1012
    CLOSE_READER(re, s)
1013
    return code;
1014
}
1015

    
1016
//#define TRACE
1017

    
1018
#ifdef TRACE
1019

    
1020
static inline void print_bin(int bits, int n){
1021
    int i;
1022
    
1023
    for(i=n-1; i>=0; i--){
1024
        printf("%d", (bits>>i)&1);
1025
    }
1026
    for(i=n; i<24; i++)
1027
        printf(" ");
1028
}
1029

    
1030
static inline int get_bits_trace(GetBitContext *s, int n, char *file, char *func, int line){
1031
    int r= get_bits(s, n);
1032
    
1033
    print_bin(r, n);
1034
    printf("%5d %2d %3d bit @%5d in %s %s:%d\n", r, n, r, get_bits_count(s)-n, file, func, line);
1035
    return r;
1036
}
1037
static inline int get_vlc_trace(GetBitContext *s, VLC_TYPE (*table)[2], int bits, int max_depth, char *file, char *func, int line){
1038
    int show= show_bits(s, 24);
1039
    int pos= get_bits_count(s);
1040
    int r= get_vlc2(s, table, bits, max_depth);
1041
    int len= get_bits_count(s) - pos;
1042
    int bits2= show>>(24-len);
1043
    
1044
    print_bin(bits2, len);
1045
    
1046
    printf("%5d %2d %3d vlc @%5d in %s %s:%d\n", bits2, len, r, pos, file, func, line);
1047
    return r;
1048
}
1049
static inline int get_xbits_trace(GetBitContext *s, int n, char *file, char *func, int line){
1050
    int show= show_bits(s, n);
1051
    int r= get_xbits(s, n);
1052
    
1053
    print_bin(show, n);
1054
    printf("%5d %2d %3d xbt @%5d in %s %s:%d\n", show, n, r, get_bits_count(s)-n, file, func, line);
1055
    return r;
1056
}
1057

    
1058
#define get_bits(s, n)  get_bits_trace(s, n, __FILE__, __PRETTY_FUNCTION__, __LINE__)
1059
#define get_bits1(s)    get_bits_trace(s, 1, __FILE__, __PRETTY_FUNCTION__, __LINE__)
1060
#define get_xbits(s, n) get_xbits_trace(s, n, __FILE__, __PRETTY_FUNCTION__, __LINE__)
1061
#define get_vlc(s, vlc)            get_vlc_trace(s, (vlc)->table, (vlc)->bits, 3, __FILE__, __PRETTY_FUNCTION__, __LINE__)
1062
#define get_vlc2(s, tab, bits, max) get_vlc_trace(s, tab, bits, max, __FILE__, __PRETTY_FUNCTION__, __LINE__)
1063

    
1064
#define tprintf(...) av_log(NULL, AV_LOG_DEBUG, __VA_ARGS__)
1065

    
1066
#else //TRACE
1067
#define tprintf(...) {}
1068
#endif
1069

    
1070
/* define it to include statistics code (useful only for optimizing
1071
   codec efficiency */
1072
//#define STATS
1073

    
1074
#ifdef STATS
1075

    
1076
enum {
1077
    ST_UNKNOWN,
1078
    ST_DC,
1079
    ST_INTRA_AC,
1080
    ST_INTER_AC,
1081
    ST_INTRA_MB,
1082
    ST_INTER_MB,
1083
    ST_MV,
1084
    ST_NB,
1085
};
1086

    
1087
extern int st_current_index;
1088
extern unsigned int st_bit_counts[ST_NB];
1089
extern unsigned int st_out_bit_counts[ST_NB];
1090

    
1091
void print_stats(void);
1092
#endif
1093

    
1094
/* misc math functions */
1095
extern const uint8_t ff_log2_tab[256];
1096

    
1097
static inline int av_log2(unsigned int v)
1098
{
1099
    int n;
1100

    
1101
    n = 0;
1102
    if (v & 0xffff0000) {
1103
        v >>= 16;
1104
        n += 16;
1105
    }
1106
    if (v & 0xff00) {
1107
        v >>= 8;
1108
        n += 8;
1109
    }
1110
    n += ff_log2_tab[v];
1111

    
1112
    return n;
1113
}
1114

    
1115
static inline int av_log2_16bit(unsigned int v)
1116
{
1117
    int n;
1118

    
1119
    n = 0;
1120
    if (v & 0xff00) {
1121
        v >>= 8;
1122
        n += 8;
1123
    }
1124
    n += ff_log2_tab[v];
1125

    
1126
    return n;
1127
}
1128

    
1129
/* median of 3 */
1130
static inline int mid_pred(int a, int b, int c)
1131
{
1132
#if 0
1133
    int t= (a-b)&((a-b)>>31);
1134
    a-=t;
1135
    b+=t;
1136
    b-= (b-c)&((b-c)>>31);
1137
    b+= (a-b)&((a-b)>>31);
1138

1139
    return b;
1140
#else
1141
    if(a>b){
1142
        if(c>b){
1143
            if(c>a) b=a;
1144
            else    b=c;
1145
        }
1146
    }else{
1147
        if(b>c){
1148
            if(c>a) b=c;
1149
            else    b=a;
1150
        }
1151
    }
1152
    return b;
1153
#endif
1154
}
1155

    
1156
static inline int clip(int a, int amin, int amax)
1157
{
1158
    if (a < amin)
1159
        return amin;
1160
    else if (a > amax)
1161
        return amax;
1162
    else
1163
        return a;
1164
}
1165

    
1166
static inline int clip_uint8(int a)
1167
{
1168
    if (a&(~255)) return (-a)>>31;
1169
    else          return a;
1170
}
1171

    
1172
/* math */
1173
extern const uint8_t ff_sqrt_tab[128];
1174

    
1175
int64_t ff_gcd(int64_t a, int64_t b);
1176

    
1177
static inline int ff_sqrt(int a)
1178
{
1179
    int ret=0;
1180
    int s;
1181
    int ret_sq=0;
1182
    
1183
    if(a<128) return ff_sqrt_tab[a];
1184
    
1185
    for(s=15; s>=0; s--){
1186
        int b= ret_sq + (1<<(s*2)) + (ret<<s)*2;
1187
        if(b<=a){
1188
            ret_sq=b;
1189
            ret+= 1<<s;
1190
        }
1191
    }
1192
    return ret;
1193
}
1194

    
1195
/**
1196
 * converts fourcc string to int
1197
 */
1198
static inline int ff_get_fourcc(const char *s){
1199
    assert( strlen(s)==4 );
1200

    
1201
    return (s[0]) + (s[1]<<8) + (s[2]<<16) + (s[3]<<24);
1202
}
1203

    
1204
#define MKTAG(a,b,c,d) (a | (b << 8) | (c << 16) | (d << 24))
1205
#define MKBETAG(a,b,c,d) (d | (c << 8) | (b << 16) | (a << 24))
1206

    
1207

    
1208
#ifdef ARCH_X86
1209
#define MASK_ABS(mask, level)\
1210
            asm volatile(\
1211
                "cdq                        \n\t"\
1212
                "xorl %1, %0                \n\t"\
1213
                "subl %1, %0                \n\t"\
1214
                : "+a" (level), "=&d" (mask)\
1215
            );
1216
#else
1217
#define MASK_ABS(mask, level)\
1218
            mask= level>>31;\
1219
            level= (level^mask)-mask;
1220
#endif
1221

    
1222

    
1223
#if __CPU__ >= 686 && !defined(RUNTIME_CPUDETECT)
1224
#define COPY3_IF_LT(x,y,a,b,c,d)\
1225
asm volatile (\
1226
    "cmpl %0, %3        \n\t"\
1227
    "cmovl %3, %0        \n\t"\
1228
    "cmovl %4, %1        \n\t"\
1229
    "cmovl %5, %2        \n\t"\
1230
    : "+r" (x), "+r" (a), "+r" (c)\
1231
    : "r" (y), "r" (b), "r" (d)\
1232
);
1233
#else
1234
#define COPY3_IF_LT(x,y,a,b,c,d)\
1235
if((y)<(x)){\
1236
     (x)=(y);\
1237
     (a)=(b);\
1238
     (c)=(d);\
1239
}
1240
#endif
1241

    
1242
#ifdef ARCH_X86
1243
static inline long long rdtsc()
1244
{
1245
        long long l;
1246
        asm volatile(        "rdtsc\n\t"
1247
                : "=A" (l)
1248
        );
1249
        return l;
1250
}
1251

    
1252
#define START_TIMER \
1253
uint64_t tend;\
1254
uint64_t tstart= rdtsc();\
1255

    
1256
#define STOP_TIMER(id) \
1257
tend= rdtsc();\
1258
{\
1259
  static uint64_t tsum=0;\
1260
  static int tcount=0;\
1261
  static int tskip_count=0;\
1262
  if(tcount<2 || tend - tstart < 8*tsum/tcount){\
1263
      tsum+= tend - tstart;\
1264
      tcount++;\
1265
  }else\
1266
      tskip_count++;\
1267
  if(256*256*256*64%(tcount+tskip_count)==0){\
1268
      av_log(NULL, AV_LOG_DEBUG, "%Ld dezicycles in %s, %d runs, %d skips\n", tsum*10/tcount, id, tcount, tskip_count);\
1269
  }\
1270
}
1271
#endif
1272

    
1273
#define CLAMP_TO_8BIT(d) ((d > 0xff) ? 0xff : (d < 0) ? 0 : d)
1274

    
1275
/* avoid usage of various functions */
1276
#define malloc please_use_av_malloc
1277
#define free please_use_av_free
1278
#define realloc please_use_av_realloc
1279
#define time time_is_forbidden_due_to_security_issues
1280
#define rand rand_is_forbidden_due_to_state_trashing
1281
#define srand srand_is_forbidden_due_to_state_trashing
1282
#if !(defined(LIBAVFORMAT_BUILD) || defined(_FRAMEHOOK_H))
1283
#define printf please_use_av_log
1284
#define fprintf please_use_av_log
1285
#endif
1286

    
1287
#define CHECKED_ALLOCZ(p, size)\
1288
{\
1289
    p= av_mallocz(size);\
1290
    if(p==NULL && (size)!=0){\
1291
        perror("malloc");\
1292
        goto fail;\
1293
    }\
1294
}
1295

    
1296
#endif /* HAVE_AV_CONFIG_H */
1297

    
1298
#endif /* COMMON_H */