1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libvorbis/lib/os.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,190 @@
1.4 +#ifndef _OS_H
1.5 +#define _OS_H
1.6 +/********************************************************************
1.7 + * *
1.8 + * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
1.9 + * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
1.10 + * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
1.11 + * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
1.12 + * *
1.13 + * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009 *
1.14 + * by the Xiph.Org Foundation http://www.xiph.org/ *
1.15 + * *
1.16 + ********************************************************************
1.17 +
1.18 + function: #ifdef jail to whip a few platforms into the UNIX ideal.
1.19 + last mod: $Id: os.h 19031 2013-12-03 19:20:50Z tterribe $
1.20 +
1.21 + ********************************************************************/
1.22 +
1.23 +#ifdef HAVE_CONFIG_H
1.24 +#include "config.h"
1.25 +#endif
1.26 +
1.27 +#include <math.h>
1.28 +#include <ogg/os_types.h>
1.29 +
1.30 +#include "misc.h"
1.31 +
1.32 +#ifndef _V_IFDEFJAIL_H_
1.33 +# define _V_IFDEFJAIL_H_
1.34 +
1.35 +# ifdef __GNUC__
1.36 +# define STIN static __inline__
1.37 +# elif _WIN32
1.38 +# define STIN static __inline
1.39 +# else
1.40 +# define STIN static
1.41 +# endif
1.42 +
1.43 +#ifdef DJGPP
1.44 +# define rint(x) (floor((x)+0.5f))
1.45 +#endif
1.46 +
1.47 +#ifndef M_PI
1.48 +# define M_PI (3.1415926536f)
1.49 +#endif
1.50 +
1.51 +#if defined(_WIN32) && !defined(__SYMBIAN32__)
1.52 +# include <malloc.h>
1.53 +# define rint(x) (floor((x)+0.5f))
1.54 +# define NO_FLOAT_MATH_LIB
1.55 +# define FAST_HYPOT(a, b) sqrt((a)*(a) + (b)*(b))
1.56 +#endif
1.57 +
1.58 +#if defined(__SYMBIAN32__) && defined(__WINS__)
1.59 +void *_alloca(size_t size);
1.60 +# define alloca _alloca
1.61 +#endif
1.62 +
1.63 +#ifndef FAST_HYPOT
1.64 +# define FAST_HYPOT hypot
1.65 +#endif
1.66 +
1.67 +#endif
1.68 +
1.69 +#ifdef HAVE_ALLOCA_H
1.70 +# include <alloca.h>
1.71 +#endif
1.72 +
1.73 +#ifdef USE_MEMORY_H
1.74 +# include <memory.h>
1.75 +#endif
1.76 +
1.77 +#ifndef min
1.78 +# define min(x,y) ((x)>(y)?(y):(x))
1.79 +#endif
1.80 +
1.81 +#ifndef max
1.82 +# define max(x,y) ((x)<(y)?(y):(x))
1.83 +#endif
1.84 +
1.85 +
1.86 +/* Special i386 GCC implementation */
1.87 +#if defined(__i386__) && defined(__GNUC__) && !defined(__BEOS__)
1.88 +# define VORBIS_FPU_CONTROL
1.89 +/* both GCC and MSVC are kinda stupid about rounding/casting to int.
1.90 + Because of encapsulation constraints (GCC can't see inside the asm
1.91 + block and so we end up doing stupid things like a store/load that
1.92 + is collectively a noop), we do it this way */
1.93 +
1.94 +/* we must set up the fpu before this works!! */
1.95 +
1.96 +typedef ogg_int16_t vorbis_fpu_control;
1.97 +
1.98 +static inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
1.99 + ogg_int16_t ret;
1.100 + ogg_int16_t temp;
1.101 + __asm__ __volatile__("fnstcw %0\n\t"
1.102 + "movw %0,%%dx\n\t"
1.103 + "andw $62463,%%dx\n\t"
1.104 + "movw %%dx,%1\n\t"
1.105 + "fldcw %1\n\t":"=m"(ret):"m"(temp): "dx");
1.106 + *fpu=ret;
1.107 +}
1.108 +
1.109 +static inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
1.110 + __asm__ __volatile__("fldcw %0":: "m"(fpu));
1.111 +}
1.112 +
1.113 +/* assumes the FPU is in round mode! */
1.114 +static inline int vorbis_ftoi(double f){ /* yes, double! Otherwise,
1.115 + we get extra fst/fld to
1.116 + truncate precision */
1.117 + int i;
1.118 + __asm__("fistl %0": "=m"(i) : "t"(f));
1.119 + return(i);
1.120 +}
1.121 +#endif /* Special i386 GCC implementation */
1.122 +
1.123 +
1.124 +/* MSVC inline assembly. 32 bit only; inline ASM isn't implemented in the
1.125 + * 64 bit compiler */
1.126 +#if defined(_MSC_VER) && !defined(_WIN64) && !defined(_WIN32_WCE)
1.127 +# define VORBIS_FPU_CONTROL
1.128 +
1.129 +typedef ogg_int16_t vorbis_fpu_control;
1.130 +
1.131 +static __inline int vorbis_ftoi(double f){
1.132 + int i;
1.133 + __asm{
1.134 + fld f
1.135 + fistp i
1.136 + }
1.137 + return i;
1.138 +}
1.139 +
1.140 +static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
1.141 + (void)fpu;
1.142 +}
1.143 +
1.144 +static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
1.145 + (void)fpu;
1.146 +}
1.147 +
1.148 +#endif /* Special MSVC 32 bit implementation */
1.149 +
1.150 +
1.151 +/* Optimized code path for x86_64 builds. Uses SSE2 intrinsics. This can be
1.152 + done safely because all x86_64 CPUs supports SSE2. */
1.153 +#if (defined(_MSC_VER) && defined(_WIN64)) || (defined(__GNUC__) && defined (__x86_64__))
1.154 +# define VORBIS_FPU_CONTROL
1.155 +
1.156 +typedef ogg_int16_t vorbis_fpu_control;
1.157 +
1.158 +#include <emmintrin.h>
1.159 +static __inline int vorbis_ftoi(double f){
1.160 + return _mm_cvtsd_si32(_mm_load_sd(&f));
1.161 +}
1.162 +
1.163 +static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
1.164 + (void)fpu;
1.165 +}
1.166 +
1.167 +static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
1.168 + (void)fpu;
1.169 +}
1.170 +
1.171 +#endif /* Special MSVC x64 implementation */
1.172 +
1.173 +
1.174 +/* If no special implementation was found for the current compiler / platform,
1.175 + use the default implementation here: */
1.176 +#ifndef VORBIS_FPU_CONTROL
1.177 +
1.178 +typedef int vorbis_fpu_control;
1.179 +
1.180 +static int vorbis_ftoi(double f){
1.181 + /* Note: MSVC and GCC (at least on some systems) round towards zero, thus,
1.182 + the floor() call is required to ensure correct roudning of
1.183 + negative numbers */
1.184 + return (int)floor(f+.5);
1.185 +}
1.186 +
1.187 +/* We don't have special code for this compiler/arch, so do it the slow way */
1.188 +# define vorbis_fpu_setround(vorbis_fpu_control) {}
1.189 +# define vorbis_fpu_restore(vorbis_fpu_control) {}
1.190 +
1.191 +#endif /* default implementation */
1.192 +
1.193 +#endif /* _OS_H */
