bitstreamf.h 文件参考

浏览源代码.

结构体
struct	GetBitContext
struct	VLC
struct	RL_VLC_ELEM

宏定义
#define	__STATIC_INLINE   static inline
#define	letoh32(x)   (x)
#define	betoh32(x)   swap32(x)
#define	IBSS_ATTR
#define	ICONST_ATTR
#define	ICODE_ATTR
#define	ICODE_ATTR_FLAC   ICODE_ATTR
#define	IBSS_ATTR_FLAC_DECODED0   IBSS_ATTR
#define	ALT_BITSTREAM_READER_BE
#define	NEG_SSR32(a, s)   (((int32_t)(a))>>(32-(s)))
#define	NEG_USR32(a, s)   (((uint32_t)(a))>>(32-(s)))
#define	VLC_TYPE   int16_t
#define	MIN_CACHE_BITS   25
#define	OPEN_READER(name, gb)
#define	CLOSE_READER(name, gb)   (gb)->index= name##_index;\
#define	UPDATE_CACHE(name, gb)   name##_cache= unaligned32_be( ((const uint8_t *)(gb)->buffer)+(name##_index>>3) ) << (name##_index&0x07);\
#define	SKIP_CACHE(name, gb, num)   name##_cache <<= (num);
#define	SKIP_COUNTER(name, gb, num)   name##_index += (num);\
#define	SKIP_BITS(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)

类型定义
typedef struct GetBitContext	GetBitContext
typedef struct VLC	VLC
typedef struct RL_VLC_ELEM	RL_VLC_ELEM

函数
static unsigned short	swap16 (unsigned short value)
static unsigned long	swap32 (unsigned long value)
static uint32_t	unaligned32 (const void *v)
static int	unaligned32_be (const void *v)
static int	unaligned32_le (const void *v)
static int	get_bits_count (GetBitContext *s)
static int	get_sbits (GetBitContext *s, int n)
static unsigned int	get_bits (GetBitContext *s, int n)
static unsigned int	show_bits (GetBitContext *s, int n)
static void	skip_bits (GetBitContext *s, int n)
static unsigned int	get_bits1 (GetBitContext *s)
static unsigned int	show_bits1 (GetBitContext *s)
static void	skip_bits1 (GetBitContext *s)
static void	init_get_bits (GetBitContext *s, const uint8_t *buffer, int bit_size)
void	align_get_bits (GetBitContext *s)

---

结构体说明

GetBitContext

struct GetBitContext

成员变量
const uint8_t *	buffer
const uint8_t *	buffer_end
int	index
int	size_in_bits

VLC

struct VLC

成员变量
int	bits
int16_t(*	table)[2]	code, bits
int	table_allocated
int	table_size

RL_VLC_ELEM

struct RL_VLC_ELEM

成员变量
int8_t	len
int16_t	level
uint8_t	run

宏定义说明

__STATIC_INLINE

#define __STATIC_INLINE   static inline

ALT_BITSTREAM_READER_BE

#define ALT_BITSTREAM_READER_BE

betoh32

#define betoh32

(

x

)

swap32(x)

CLOSE_READER

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

GET_CACHE

#define GET_CACHE	(		name,
			gb
	)		((uint32_t)name##_cache)

IBSS_ATTR

#define IBSS_ATTR

IBSS_ATTR_FLAC_DECODED0

#define IBSS_ATTR_FLAC_DECODED0   IBSS_ATTR

ICODE_ATTR

#define ICODE_ATTR

ICODE_ATTR_FLAC

#define ICODE_ATTR_FLAC   ICODE_ATTR

ICONST_ATTR

#define ICONST_ATTR

LAST_SKIP_BITS

#define LAST_SKIP_BITS	(		name,
			gb,
			num
	)		SKIP_COUNTER(name, gb, num)

LAST_SKIP_CACHE

#define LAST_SKIP_CACHE	(		name,
			gb,
			num
	)		;

letoh32

#define letoh32

(

x

)

(x)

MIN_CACHE_BITS

#define MIN_CACHE_BITS   25

NEG_SSR32

#define NEG_SSR32	(		a,
			s
	)		(((int32_t)(a))>>(32-(s)))

NEG_USR32

#define NEG_USR32	(		a,
			s
	)		(((uint32_t)(a))>>(32-(s)))

OPEN_READER

#define OPEN_READER	(		name,
			gb
	)

值:

int name##_index= (gb)->index;\
        int name##_cache= 0;\

SHOW_SBITS

#define SHOW_SBITS	(		name,
			gb,
			num
	)		NEG_SSR32(name##_cache, num)

SHOW_UBITS

#define SHOW_UBITS	(		name,
			gb,
			num
	)		NEG_USR32(name##_cache, num)

SKIP_BITS

#define SKIP_BITS	(		name,
			gb,
			num
	)

值:

{\
            SKIP_CACHE(name, gb, num)\
            SKIP_COUNTER(name, gb, num)\
        }\

SKIP_CACHE

#define SKIP_CACHE	(		name,
			gb,
			num
	)		name##_cache <<= (num);

SKIP_COUNTER

#define SKIP_COUNTER	(		name,
			gb,
			num
	)		name##_index += (num);\

UPDATE_CACHE

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

VLC_TYPE

#define VLC_TYPE   int16_t

类型定义说明

GetBitContext

typedef struct GetBitContext GetBitContext

RL_VLC_ELEM

typedef struct RL_VLC_ELEM RL_VLC_ELEM

VLC

typedef struct VLC VLC

函数说明

align_get_bits()

void align_get_bits

(

GetBitContext *

s

)

get_bits()

static unsigned int get_bits ( GetBitContext *  s, int  n  )

inlinestatic

get_bits1()

static unsigned int get_bits1 ( GetBitContext *  s )

inlinestatic

get_bits_count()

static int get_bits_count ( GetBitContext *  s )

inlinestatic

get_sbits()

static int get_sbits ( GetBitContext *  s, int  n  )

inlinestatic

init_get_bits()

static void init_get_bits ( GetBitContext *  s, const uint8_t *  buffer, int  bit_size  )

inlinestatic

show_bits()

static unsigned int show_bits ( GetBitContext *  s, int  n  )

inlinestatic

show_bits1()

static unsigned int show_bits1 ( GetBitContext *  s )

inlinestatic

skip_bits()

static void skip_bits ( GetBitContext *  s, int  n  )

inlinestatic

skip_bits1()

static void skip_bits1 ( GetBitContext *  s )

inlinestatic

swap16()

static unsigned short swap16 ( unsigned short  value )

inlinestatic

swap32()

static unsigned long swap32 ( unsigned long  value )

inlinestatic

unaligned32()

static uint32_t unaligned32 ( const void *  v )

inlinestatic

unaligned32_be()

static int unaligned32_be ( const void *  v )

inlinestatic

unaligned32_le()

static int unaligned32_le ( const void *  v )

inlinestatic