wmapro_typedef.h

来自「SigmDesign SMP8634 media decode chip dev」· C头文件 代码 · 共 81 行

#ifndef _WMAPRO_TYPEDEF_H_
#define _WMAPRO_TYPEDEF_H_

// ***************************************************
//            default fundamental typedefs
// ***************************************************
#ifndef PLATFORM_SPECIFIC_U64
#ifdef WIN32
typedef unsigned __int64 U64;
#else
typedef unsigned long long U64;
#endif
#endif

#ifndef PLATFORM_SPECIFIC_I64
#ifdef WIN32
typedef __int64 I64;
#else
typedef long long I64;
#endif
#endif

#ifndef PLATFORM_SPECIFIC_U32
typedef unsigned long U32;
#define U32_MAX ((U32)0xffffffffu)
#define PLATFORM_SPECIFIC_U32
#endif

#ifndef PLATFORM_SPECIFIC_I32
typedef long I32;
#define I32_MIN ((I32)0x80000000)
#define I32_MAX ((I32)0x7fffffff)
#define PLATFORM_SPECIFIC_I32
#endif

#ifndef PLATFORM_SPECIFIC_U16
typedef unsigned short U16;
#define U16_MAX ((I32)0x0000ffff)
#define PLATFORM_SPECIFIC_U16
#endif

#ifndef PLATFORM_SPECIFIC_I16
typedef short I16;
#define I16_MIN ((I32)0xffff8000)
#define I16_MAX ((I32)0x00007fff)
#define PLATFORM_SPECIFIC_I16
#endif

#ifndef PLATFORM_SPECIFIC_U8
typedef unsigned char U8;
#define U8_MAX ((I32)0x000000ff)
#define PLATFORM_SPECIFIC_U8
#endif

#ifndef PLATFORM_SPECIFIC_I8
typedef signed char I8;
#define I8_MIN ((I32)0xffffff80)
#define I8_MAX ((I32)0x0000007f)
#define PLATFORM_SPECIFIC_I8
#endif

#ifndef INLINE
#define INLINE __inline
#endif

//****************************************************************************
// floor of log base 2 of a number which is a power of 2 
//****************************************************************************
static INLINE I32 LOG2(U32 i)
{   // returns n where n = log2(2^n) = log2(2^(n+1)-1)
    U32 iLog2 = 0;    

    while ((i >> iLog2) > 1)
        iLog2++;

    return iLog2;
}

#endif //_WMAPRO_TYPEDEF_H_