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ffmpeg/libavcodec/common.h

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/**
* @file common.h
* common internal api header.
*/
#ifndef COMMON_H
#define COMMON_H
#define FFMPEG_VERSION_INT 0x000406
#define FFMPEG_VERSION "0.4.6"
#if defined(WIN32) && !defined(__MINGW32__) && !defined(__CYGWIN__)
# define CONFIG_WIN32
#endif
//#define ALT_BITSTREAM_WRITER
//#define ALIGNED_BITSTREAM_WRITER
#define ALT_BITSTREAM_READER
//#define LIBMPEG2_BITSTREAM_READER
//#define A32_BITSTREAM_READER
#ifdef HAVE_AV_CONFIG_H
/* only include the following when compiling package */
# include "config.h"
# include <stdlib.h>
# include <stdio.h>
# include <string.h>
# ifndef __BEOS__
# include <errno.h>
# else
# include "berrno.h"
# endif
# include <math.h>
# ifndef ENODATA
# define ENODATA 61
# endif
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
#include <stddef.h>
#ifndef offsetof
# define offsetof(T,F) ((unsigned int)((char *)&((T *)0)->F))
#endif
#define AVOPTION_CODEC_BOOL(name, help, field) \
{ name, help, offsetof(AVCodecContext, field), FF_OPT_TYPE_BOOL }
#define AVOPTION_CODEC_FLAG(name, help, field, flag, defval) \
{ name, help, offsetof(AVCodecContext, field), FF_OPT_TYPE_FLAG, flag, 0, defval }
#define AVOPTION_CODEC_INT(name, help, field, minv, maxv, defval) \
{ name, help, offsetof(AVCodecContext, field), FF_OPT_TYPE_INT, minv, maxv, defval }
#define AVOPTION_CODEC_STRING(name, help, field, str, val) \
{ name, help, offsetof(AVCodecContext, field), FF_OPT_TYPE_STRING, .defval = val, .defstr = str }
#define AVOPTION_CODEC_RCOVERRIDE(name, help, field) \
{ name, help, offsetof(AVCodecContext, field), FF_OPT_TYPE_RCOVERRIDE, .defval = 0, .defstr = NULL }
#define AVOPTION_SUB(ptr) { .name = NULL, .sub = ptr }
#define AVOPTION_END() AVOPTION_SUB(NULL)
#endif /* HAVE_AV_CONFIG_H */
/* Suppress restrict if it was not defined in config.h. */
#ifndef restrict
# define restrict
#endif
#if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
# define always_inline __attribute__((always_inline)) inline
#else
# define always_inline inline
#endif
#ifdef CONFIG_WIN32
/* windows */
typedef unsigned short uint16_t;
typedef signed short int16_t;
typedef unsigned char uint8_t;
typedef unsigned int uint32_t;
typedef unsigned __int64 uint64_t;
typedef signed char int8_t;
typedef signed int int32_t;
typedef signed __int64 int64_t;
# ifndef __MINGW32__
# define int64_t_C(c) (c ## i64)
# define uint64_t_C(c) (c ## i64)
# define inline __inline
# else
# define int64_t_C(c) (c ## LL)
# define uint64_t_C(c) (c ## ULL)
# endif /* __MINGW32__ */
# ifdef _DEBUG
# define DEBUG
# endif
# define snprintf _snprintf
# define vsnprintf _vsnprintf
/* CONFIG_WIN32 end */
#elif defined (CONFIG_OS2)
/* OS/2 EMX */
#include <inttypes.h>
#ifdef HAVE_AV_CONFIG_H
#ifndef int64_t_C
#define int64_t_C(c) (c ## LL)
#define uint64_t_C(c) (c ## ULL)
#endif
#ifdef USE_FASTMEMCPY
#include "fastmemcpy.h"
#endif
#include <float.h>
#endif /* HAVE_AV_CONFIG_H */
/* CONFIG_OS2 end */
#else
/* unix */
# include <inttypes.h>
# ifdef HAVE_AV_CONFIG_H
# ifndef int64_t_C
# define int64_t_C(c) (c ## LL)
# define uint64_t_C(c) (c ## ULL)
# endif
# ifdef USE_FASTMEMCPY
# include "fastmemcpy.h"
# endif
# endif /* HAVE_AV_CONFIG_H */
#endif /* !CONFIG_WIN32 && !CONFIG_OS2 */
#ifdef HAVE_AV_CONFIG_H
# include "bswap.h"
# if defined(__MINGW32__) || defined(__CYGWIN__) || \
defined(__OS2__) || defined (__OpenBSD__)
# define MANGLE(a) "_" #a
# else
# define MANGLE(a) #a
# endif
/* debug stuff */
# ifndef DEBUG
# define NDEBUG
# endif
# include <assert.h>
/* dprintf macros */
# if defined(CONFIG_WIN32) && !defined(__MINGW32__)
inline void dprintf(const char* fmt,...) {}
# else
# ifdef DEBUG
# define dprintf(fmt,args...) printf(fmt, ## args)
# else
# define dprintf(fmt,args...)
# endif
# endif /* !CONFIG_WIN32 */
# define av_abort() do { fprintf(stderr, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)
//rounded divison & shift
#define RSHIFT(a,b) ((a) > 0 ? ((a) + (1<<((b)-1)))>>(b) : ((a) + (1<<((b)-1))-1)>>(b))
/* assume b>0 */
#define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
#define ABS(a) ((a) >= 0 ? (a) : (-(a)))
#define FFMAX(a,b) ((a) > (b) ? (a) : (b))
#define FFMIN(a,b) ((a) > (b) ? (b) : (a))
#ifdef ARCH_X86
// avoid +32 for shift optimization (gcc should do that ...)
static inline int32_t NEG_SSR32( int32_t a, int8_t s){
asm ("sarl %1, %0\n\t"
: "+r" (a)
: "ic" ((uint8_t)(-s))
);
return a;
}
static inline uint32_t NEG_USR32(uint32_t a, int8_t s){
asm ("shrl %1, %0\n\t"
: "+r" (a)
: "ic" ((uint8_t)(-s))
);
return a;
}
#else
# define NEG_SSR32(a,s) ((( int32_t)(a))>>(32-(s)))
# define NEG_USR32(a,s) (((uint32_t)(a))>>(32-(s)))
#endif
/* bit output */
struct PutBitContext;
typedef void (*WriteDataFunc)(void *, uint8_t *, int);
typedef struct PutBitContext {
#ifdef ALT_BITSTREAM_WRITER
uint8_t *buf, *buf_end;
int index;
#else
uint32_t bit_buf;
int bit_left;
uint8_t *buf, *buf_ptr, *buf_end;
#endif
int64_t data_out_size; /* in bytes */
} PutBitContext;
void init_put_bits(PutBitContext *s,
uint8_t *buffer, int buffer_size,
void *opaque,
void (*write_data)(void *, uint8_t *, int));
int64_t get_bit_count(PutBitContext *s); /* XXX: change function name */
void align_put_bits(PutBitContext *s);
void flush_put_bits(PutBitContext *s);
void put_string(PutBitContext * pbc, char *s);
/* bit input */
typedef struct GetBitContext {
const uint8_t *buffer, *buffer_end;
#ifdef ALT_BITSTREAM_READER
int index;
#elif defined LIBMPEG2_BITSTREAM_READER
uint8_t *buffer_ptr;
uint32_t cache;
int bit_count;
#elif defined A32_BITSTREAM_READER
uint32_t *buffer_ptr;
uint32_t cache0;
uint32_t cache1;
int bit_count;
#endif
int size_in_bits;
} GetBitContext;
static inline int get_bits_count(GetBitContext *s);
#define VLC_TYPE int16_t
typedef struct VLC {
int bits;
VLC_TYPE (*table)[2]; // code, bits
int table_size, table_allocated;
} VLC;
typedef struct RL_VLC_ELEM {
int16_t level;
int8_t len;
uint8_t run;
} RL_VLC_ELEM;
#ifdef ARCH_SPARC64
#define UNALIGNED_STORES_ARE_BAD
#endif
/* used to avoid missaligned exceptions on some archs (alpha, ...) */
#ifdef ARCH_X86
# define unaligned32(a) (*(uint32_t*)(a))
#else
# ifdef __GNUC__
static inline uint32_t unaligned32(const void *v) {
struct Unaligned {
uint32_t i;
} __attribute__((packed));
return ((const struct Unaligned *) v)->i;
}
# elif defined(__DECC)
static inline uint32_t unaligned32(const void *v) {
return *(const __unaligned uint32_t *) v;
}
# else
static inline uint32_t unaligned32(const void *v) {
return *(const uint32_t *) v;
}
# endif
#endif //!ARCH_X86
#ifndef ALT_BITSTREAM_WRITER
static inline void put_bits(PutBitContext *s, int n, unsigned int value)
{
unsigned int bit_buf;
int bit_left;
#ifdef STATS
st_out_bit_counts[st_current_index] += n;
#endif
// printf("put_bits=%d %x\n", n, value);
assert(n == 32 || value < (1U << n));
bit_buf = s->bit_buf;
bit_left = s->bit_left;
// printf("n=%d value=%x cnt=%d buf=%x\n", n, value, bit_cnt, bit_buf);
/* XXX: optimize */
if (n < bit_left) {
bit_buf = (bit_buf<<n) | value;
bit_left-=n;
} else {
bit_buf<<=bit_left;
bit_buf |= value >> (n - bit_left);
#ifdef UNALIGNED_STORES_ARE_BAD
if (3 & (int) s->buf_ptr) {
s->buf_ptr[0] = bit_buf >> 24;
s->buf_ptr[1] = bit_buf >> 16;
s->buf_ptr[2] = bit_buf >> 8;
s->buf_ptr[3] = bit_buf ;
} else
#endif
*(uint32_t *)s->buf_ptr = be2me_32(bit_buf);
//printf("bitbuf = %08x\n", bit_buf);
s->buf_ptr+=4;
bit_left+=32 - n;
bit_buf = value;
}
s->bit_buf = bit_buf;
s->bit_left = bit_left;
}
#endif
#ifdef ALT_BITSTREAM_WRITER
static inline void put_bits(PutBitContext *s, int n, unsigned int value)
{
# ifdef ALIGNED_BITSTREAM_WRITER
# ifdef ARCH_X86
asm volatile(
"movl %0, %%ecx \n\t"
"xorl %%eax, %%eax \n\t"
"shrdl %%cl, %1, %%eax \n\t"
"shrl %%cl, %1 \n\t"
"movl %0, %%ecx \n\t"
"shrl $3, %%ecx \n\t"
"andl $0xFFFFFFFC, %%ecx \n\t"
"bswapl %1 \n\t"
"orl %1, (%2, %%ecx) \n\t"
"bswapl %%eax \n\t"
"addl %3, %0 \n\t"
"movl %%eax, 4(%2, %%ecx) \n\t"
: "=&r" (s->index), "=&r" (value)
: "r" (s->buf), "r" (n), "0" (s->index), "1" (value<<(-n))
: "%eax", "%ecx"
);
# else
int index= s->index;
uint32_t *ptr= ((uint32_t *)s->buf)+(index>>5);
value<<= 32-n;
ptr[0] |= be2me_32(value>>(index&31));
ptr[1] = be2me_32(value<<(32-(index&31)));
//if(n>24) printf("%d %d\n", n, value);
index+= n;
s->index= index;
# endif
# else //ALIGNED_BITSTREAM_WRITER
# ifdef ARCH_X86
asm volatile(
"movl $7, %%ecx \n\t"
"andl %0, %%ecx \n\t"
"addl %3, %%ecx \n\t"
"negl %%ecx \n\t"
"shll %%cl, %1 \n\t"
"bswapl %1 \n\t"
"movl %0, %%ecx \n\t"
"shrl $3, %%ecx \n\t"
"orl %1, (%%ecx, %2) \n\t"
"addl %3, %0 \n\t"
"movl $0, 4(%%ecx, %2) \n\t"
: "=&r" (s->index), "=&r" (value)
: "r" (s->buf), "r" (n), "0" (s->index), "1" (value)
: "%ecx"
);
# else
int index= s->index;
uint32_t *ptr= (uint32_t*)(((uint8_t *)s->buf)+(index>>3));
ptr[0] |= be2me_32(value<<(32-n-(index&7) ));
ptr[1] = 0;
//if(n>24) printf("%d %d\n", n, value);
index+= n;
s->index= index;
# endif
# endif //!ALIGNED_BITSTREAM_WRITER
}
#endif
static inline uint8_t* pbBufPtr(PutBitContext *s)
{
#ifdef ALT_BITSTREAM_WRITER
return s->buf + (s->index>>3);
#else
return s->buf_ptr;
#endif
}
/* Bitstream reader API docs:
name
abritary name which is used as prefix for the internal variables
gb
getbitcontext
OPEN_READER(name, gb)
loads gb into local variables
CLOSE_READER(name, gb)
stores local vars in gb
UPDATE_CACHE(name, gb)
refills the internal cache from the bitstream
after this call at least MIN_CACHE_BITS will be available,
GET_CACHE(name, gb)
will output the contents of the internal cache, next bit is MSB of 32 or 64 bit (FIXME 64bit)
SHOW_UBITS(name, gb, num)
will return the nest num bits
SHOW_SBITS(name, gb, num)
will return the nest num bits and do sign extension
SKIP_BITS(name, gb, num)
will skip over the next num bits
note, this is equinvalent to SKIP_CACHE; SKIP_COUNTER
SKIP_CACHE(name, gb, num)
will remove the next num bits from the cache (note SKIP_COUNTER MUST be called before UPDATE_CACHE / CLOSE_READER)
SKIP_COUNTER(name, gb, num)
will increment the internal bit counter (see SKIP_CACHE & SKIP_BITS)
LAST_SKIP_CACHE(name, gb, num)
will remove the next num bits from the cache if it is needed for UPDATE_CACHE otherwise it will do nothing
LAST_SKIP_BITS(name, gb, num)
is equinvalent to SKIP_LAST_CACHE; SKIP_COUNTER
for examples see get_bits, show_bits, skip_bits, get_vlc
*/
#ifdef ALT_BITSTREAM_READER
# define MIN_CACHE_BITS 25
# define OPEN_READER(name, gb)\
int name##_index= (gb)->index;\
int name##_cache= 0;\
# define CLOSE_READER(name, gb)\
(gb)->index= name##_index;\
# define UPDATE_CACHE(name, gb)\
name##_cache= be2me_32( unaligned32( ((uint8_t *)(gb)->buffer)+(name##_index>>3) ) ) << (name##_index&0x07);\
# define SKIP_CACHE(name, gb, num)\
name##_cache <<= (num);\
// FIXME name?
# define SKIP_COUNTER(name, gb, num)\
name##_index += (num);\
# define SKIP_BITS(name, gb, num)\
{\
SKIP_CACHE(name, gb, num)\
SKIP_COUNTER(name, gb, num)\
}\
# define LAST_SKIP_BITS(name, gb, num) SKIP_COUNTER(name, gb, num)
# define LAST_SKIP_CACHE(name, gb, num) ;
# define SHOW_UBITS(name, gb, num)\
NEG_USR32(name##_cache, num)
# define SHOW_SBITS(name, gb, num)\
NEG_SSR32(name##_cache, num)
# define GET_CACHE(name, gb)\
((uint32_t)name##_cache)
static inline int get_bits_count(GetBitContext *s){
return s->index;
}
#elif defined LIBMPEG2_BITSTREAM_READER
//libmpeg2 like reader
# define MIN_CACHE_BITS 16
# define OPEN_READER(name, gb)\
int name##_bit_count=(gb)->bit_count;\
int name##_cache= (gb)->cache;\
uint8_t * name##_buffer_ptr=(gb)->buffer_ptr;\
# define CLOSE_READER(name, gb)\
(gb)->bit_count= name##_bit_count;\
(gb)->cache= name##_cache;\
(gb)->buffer_ptr= name##_buffer_ptr;\
# define UPDATE_CACHE(name, gb)\
if(name##_bit_count > 0){\
name##_cache+= ((name##_buffer_ptr[0]<<8) + name##_buffer_ptr[1]) << name##_bit_count;\
name##_buffer_ptr+=2;\
name##_bit_count-= 16;\
}\
# define SKIP_CACHE(name, gb, num)\
name##_cache <<= (num);\
# define SKIP_COUNTER(name, gb, num)\
name##_bit_count += (num);\
# define SKIP_BITS(name, gb, num)\
{\
SKIP_CACHE(name, gb, num)\
SKIP_COUNTER(name, gb, num)\
}\
# define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num)
# define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num)
# define SHOW_UBITS(name, gb, num)\
NEG_USR32(name##_cache, num)
# define SHOW_SBITS(name, gb, num)\
NEG_SSR32(name##_cache, num)
# define GET_CACHE(name, gb)\
((uint32_t)name##_cache)
static inline int get_bits_count(GetBitContext *s){
return (s->buffer_ptr - s->buffer)*8 - 16 + s->bit_count;
}
#elif defined A32_BITSTREAM_READER
# define MIN_CACHE_BITS 32
# define OPEN_READER(name, gb)\
int name##_bit_count=(gb)->bit_count;\
uint32_t name##_cache0= (gb)->cache0;\
uint32_t name##_cache1= (gb)->cache1;\
uint32_t * name##_buffer_ptr=(gb)->buffer_ptr;\
# define CLOSE_READER(name, gb)\
(gb)->bit_count= name##_bit_count;\
(gb)->cache0= name##_cache0;\
(gb)->cache1= name##_cache1;\
(gb)->buffer_ptr= name##_buffer_ptr;\
# define UPDATE_CACHE(name, gb)\
if(name##_bit_count > 0){\
const uint32_t next= be2me_32( *name##_buffer_ptr );\
name##_cache0 |= NEG_USR32(next,name##_bit_count);\
name##_cache1 |= next<<name##_bit_count;\
name##_buffer_ptr++;\
name##_bit_count-= 32;\
}\
#ifdef ARCH_X86
# define SKIP_CACHE(name, gb, num)\
asm(\
"shldl %2, %1, %0 \n\t"\
"shll %2, %1 \n\t"\
: "+r" (name##_cache0), "+r" (name##_cache1)\
: "Ic" ((uint8_t)num)\
);
#else
# define SKIP_CACHE(name, gb, num)\
name##_cache0 <<= (num);\
name##_cache0 |= NEG_USR32(name##_cache1,num);\
name##_cache1 <<= (num);
#endif
# define SKIP_COUNTER(name, gb, num)\
name##_bit_count += (num);\
# define SKIP_BITS(name, gb, num)\
{\
SKIP_CACHE(name, gb, num)\
SKIP_COUNTER(name, gb, num)\
}\
# define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num)
# define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num)
# define SHOW_UBITS(name, gb, num)\
NEG_USR32(name##_cache0, num)
# define SHOW_SBITS(name, gb, num)\
NEG_SSR32(name##_cache0, num)
# define GET_CACHE(name, gb)\
(name##_cache0)
static inline int get_bits_count(GetBitContext *s){
return ((uint8_t*)s->buffer_ptr - s->buffer)*8 - 32 + s->bit_count;
}
#endif
static inline unsigned int get_bits(GetBitContext *s, int n){
register int tmp;
OPEN_READER(re, s)
UPDATE_CACHE(re, s)
tmp= SHOW_UBITS(re, s, n);
LAST_SKIP_BITS(re, s, n)
CLOSE_READER(re, s)
return tmp;
}
static inline unsigned int show_bits(GetBitContext *s, int n){
register int tmp;
OPEN_READER(re, s)
UPDATE_CACHE(re, s)
tmp= SHOW_UBITS(re, s, n);
// CLOSE_READER(re, s)
return tmp;
}
static inline void skip_bits(GetBitContext *s, int n){
//Note gcc seems to optimize this to s->index+=n for the ALT_READER :))
OPEN_READER(re, s)
UPDATE_CACHE(re, s)
LAST_SKIP_BITS(re, s, n)
CLOSE_READER(re, s)
}
static inline unsigned int get_bits1(GetBitContext *s){
#ifdef ALT_BITSTREAM_READER
int index= s->index;
uint8_t result= s->buffer[ index>>3 ];
result<<= (index&0x07);
result>>= 8 - 1;
index++;
s->index= index;
return result;
#else
return get_bits(s, 1);
#endif
}
static inline unsigned int show_bits1(GetBitContext *s){
return show_bits(s, 1);
}
static inline void skip_bits1(GetBitContext *s){
skip_bits(s, 1);
}
void init_get_bits(GetBitContext *s,
const uint8_t *buffer, int buffer_size);
int check_marker(GetBitContext *s, const char *msg);
void align_get_bits(GetBitContext *s);
int init_vlc(VLC *vlc, int nb_bits, int nb_codes,
const void *bits, int bits_wrap, int bits_size,
const void *codes, int codes_wrap, int codes_size);
void free_vlc(VLC *vlc);
/**
*
* if the vlc code is invalid and max_depth=1 than no bits will be removed
* if the vlc code is invalid and max_depth>1 than the number of bits removed
* is undefined
*/
#define GET_VLC(code, name, gb, table, bits, max_depth)\
{\
int n, index, nb_bits;\
\
index= SHOW_UBITS(name, gb, bits);\
code = table[index][0];\
n = table[index][1];\
\
if(max_depth > 1 && n < 0){\
LAST_SKIP_BITS(name, gb, bits)\
UPDATE_CACHE(name, gb)\
\
nb_bits = -n;\
\
index= SHOW_UBITS(name, gb, nb_bits) + code;\
code = table[index][0];\
n = table[index][1];\
if(max_depth > 2 && n < 0){\
LAST_SKIP_BITS(name, gb, nb_bits)\
UPDATE_CACHE(name, gb)\
\
nb_bits = -n;\
\
index= SHOW_UBITS(name, gb, nb_bits) + code;\
code = table[index][0];\
n = table[index][1];\
}\
}\
SKIP_BITS(name, gb, n)\
}
#define GET_RL_VLC(level, run, name, gb, table, bits, max_depth)\
{\
int n, index, nb_bits;\
\
index= SHOW_UBITS(name, gb, bits);\
level = table[index].level;\
n = table[index].len;\
\
if(max_depth > 1 && n < 0){\
LAST_SKIP_BITS(name, gb, bits)\
UPDATE_CACHE(name, gb)\
\
nb_bits = -n;\
\
index= SHOW_UBITS(name, gb, nb_bits) + level;\
level = table[index].level;\
n = table[index].len;\
}\
run= table[index].run;\
SKIP_BITS(name, gb, n)\
}
// deprecated, dont use get_vlc for new code, use get_vlc2 instead or use GET_VLC directly
static inline int get_vlc(GetBitContext *s, VLC *vlc)
{
int code;
VLC_TYPE (*table)[2]= vlc->table;
OPEN_READER(re, s)
UPDATE_CACHE(re, s)
GET_VLC(code, re, s, table, vlc->bits, 3)
CLOSE_READER(re, s)
return code;
}
/**
* parses a vlc code, faster then get_vlc()
* @param bits is the number of bits which will be read at once, must be
* identical to nb_bits in init_vlc()
* @param max_depth is the number of times bits bits must be readed to completly
* read the longest vlc code
* = (max_vlc_length + bits - 1) / bits
*/
static always_inline int get_vlc2(GetBitContext *s, VLC_TYPE (*table)[2],
int bits, int max_depth)
{
int code;
OPEN_READER(re, s)
UPDATE_CACHE(re, s)
GET_VLC(code, re, s, table, bits, max_depth)
CLOSE_READER(re, s)
return code;
}
/* define it to include statistics code (useful only for optimizing
codec efficiency */
//#define STATS
#ifdef STATS
enum {
ST_UNKNOWN,
ST_DC,
ST_INTRA_AC,
ST_INTER_AC,
ST_INTRA_MB,
ST_INTER_MB,
ST_MV,
ST_NB,
};
extern int st_current_index;
extern unsigned int st_bit_counts[ST_NB];
extern unsigned int st_out_bit_counts[ST_NB];
void print_stats(void);
#endif
/* misc math functions */
extern const uint8_t ff_log2_tab[256];
static inline int av_log2(unsigned int v)
{
int n;
n = 0;
if (v & 0xffff0000) {
v >>= 16;
n += 16;
}
if (v & 0xff00) {
v >>= 8;
n += 8;
}
n += ff_log2_tab[v];
return n;
}
static inline int av_log2_16bit(unsigned int v)
{
int n;
n = 0;
if (v & 0xff00) {
v >>= 8;
n += 8;
}
n += ff_log2_tab[v];
return n;
}
/* median of 3 */
static inline int mid_pred(int a, int b, int c)
{
int vmin, vmax;
vmax = vmin = a;
if (b < vmin)
vmin = b;
else
vmax = b;
if (c < vmin)
vmin = c;
else if (c > vmax)
vmax = c;
return a + b + c - vmin - vmax;
}
static inline int clip(int a, int amin, int amax)
{
if (a < amin)
return amin;
else if (a > amax)
return amax;
else
return a;
}
/* math */
extern const uint8_t ff_sqrt_tab[128];
int ff_gcd(int a, int b);
static inline int ff_sqrt(int a)
{
int ret=0;
int s;
int ret_sq=0;
if(a<128) return ff_sqrt_tab[a];
for(s=15; s>=0; s--){
int b= ret_sq + (1<<(s*2)) + (ret<<s)*2;
if(b<=a){
ret_sq=b;
ret+= 1<<s;
}
}
return ret;
}
/**
* converts fourcc string to int
*/
static inline int ff_get_fourcc(const char *s){
assert( strlen(s)==4 );
return (s[0]) + (s[1]<<8) + (s[2]<<16) + (s[3]<<24);
}
void ff_float2fraction(int *nom_arg, int *denom_arg, double f, int max);
#ifdef ARCH_X86
#define MASK_ABS(mask, level)\
asm volatile(\
"cdq \n\t"\
"xorl %1, %0 \n\t"\
"subl %1, %0 \n\t"\
: "+a" (level), "=&d" (mask)\
);
#else
#define MASK_ABS(mask, level)\
mask= level>>31;\
level= (level^mask)-mask;
#endif
#if __CPU__ >= 686 && !defined(RUNTIME_CPUDETECT)
#define COPY3_IF_LT(x,y,a,b,c,d)\
asm volatile (\
"cmpl %0, %3 \n\t"\
"cmovl %3, %0 \n\t"\
"cmovl %4, %1 \n\t"\
"cmovl %5, %2 \n\t"\
: "+r" (x), "+r" (a), "+r" (c)\
: "r" (y), "r" (b), "r" (d)\
);
#else
#define COPY3_IF_LT(x,y,a,b,c,d)\
if((y)<(x)){\
(x)=(y);\
(a)=(b);\
(c)=(d);\
}
#endif
#define CLAMP_TO_8BIT(d) ((d > 0xff) ? 0xff : (d < 0) ? 0 : d)
/* avoid usage of various functions */
#define malloc please_use_av_malloc
#define free please_use_av_free
#define realloc please_use_av_realloc
#endif /* HAVE_AV_CONFIG_H */
#endif /* COMMON_H */
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