env.h

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
 *  
 * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved. 
 *      
 * The contents of this file, and the files included with this file, are 
 * subject to the current version of the RealNetworks Public Source License 
 * Version 1.0 (the "RPSL") available at 
 * http://www.helixcommunity.org/content/rpsl unless you have licensed 
 * the file under the RealNetworks Community Source License Version 1.0 
 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl, 
 * in which case the RCSL will apply. You may also obtain the license terms 
 * directly from RealNetworks.  You may not use this file except in 
 * compliance with the RPSL or, if you have a valid RCSL with RealNetworks 
 * applicable to this file, the RCSL.  Please see the applicable RPSL or 
 * RCSL for the rights, obligations and limitations governing use of the 
 * contents of the file.  
 *  
 * This file is part of the Helix DNA Technology. RealNetworks is the 
 * developer of the Original Code and owns the copyrights in the portions 
 * it created. 
 *  
 * This file, and the files included with this file, is distributed and made 
 * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
 * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS 
 * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
 * 
 * Technology Compatibility Kit Test Suite(s) Location: 
 *    http://www.helixcommunity.org/content/tck 
 * 
 * Contributor(s): 
 *  
 * ***** END LICENSE BLOCK ***** */ 

/* standard libraries: */
#include "hlxclib/limits.h"
#include "hlxclib/string.h"
#include "hlxclib/math.h"

/* some math. constants: */
#ifndef M_PI
#define M_PI      3.14159265358979323846
#endif
#ifndef M_SQRT2
#define M_SQRT2   1.41421356237309504880
#endif

/* fast rounding to a nearest integer: */
#if defined(_M_IX86) && !defined(WINCE_EMULATOR)
static __inline int NEAREST_INT(double a)
{
    int ia;
    __asm   fld     a
    __asm   fistp   ia
    return ia;
}
#elif defined(__i386) && defined(__linux__)
static __inline int NEAREST_INT(double a)
{
    int ia;
    __asm__ __volatile__ (
        " fldl %1; "
        " fistpl %0; "
        : "=m"(ia)
        : "m"(a)
        : "memory", "st"
        );
       
    return ia; 
}
#else
#define NEAREST_INT(a) ((int) (((a)<0)? ((a)-0.5): ((a)+0.5)))
#endif

/* byte packing: */
#ifdef __linux__
#include <endian.h>
#endif
#ifndef BYTE_ORDER
#define LITTLE_ENDIAN 1234
#define BIG_ENDIAN 4321
/* make sure your system is being correctly identified here !!! */
#if defined(ultrix) || defined(__alpha) || defined(__i386__) || defined(__i486__) || defined(_X86_) || defined (_M_IX86)
#define BYTE_ORDER LITTLE_ENDIAN
#else
#define BYTE_ORDER BIG_ENDIAN
#endif
#endif

/* check platform specific constants: */
#if CHAR_BIT != 8 || (defined( _INTEGRAL_MAX_BIT) && _INTEGRAL_MAX_BITS < 32) \
|| (defined(WORD_BIT) && WORD_BIT < 32)
#error Error!!! This code is written for 32+ bit processors.
#endif

#ifndef ENV_MAIN
#define ENV_EXTERN  extern
#else
#define ENV_EXTERN  /**/
#endif

/* Intel MMX & SSE extensions: */
#if (defined(_M_IX86) || defined(_USE_MMX_BLENDERS))  && !defined(WINCE_EMULATOR)
ENV_EXTERN int _x86_MMX_Available;
ENV_EXTERN int _x86_SSE_Available;
#endif

/* AltiVec extensions */
#ifdef _MACINTOSH
ENV_EXTERN int _AltiVec_Available;
#endif