src/common/RTMath.cpp

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the Free Software           *
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,                 *
 *   MA  02111-1307  USA                                                   *
 ***************************************************************************/

#include "RTMath.h"

float  RTMathBase::CentsToFreqTable[MAX_PITCH * 1200 * 2 + 1]; // +-1200 cents per octave
float* RTMathBase::pCentsToFreqTable(InitCentsToFreqTable());

#if defined(__APPLE__)
#include <mach/mach_time.h>
typedef uint64_t time_stamp_t;
static inline time_stamp_t GetMachTime() {
    return (time_stamp_t) mach_absolute_time();
}
#endif

/*
 * Creates a real time stamp for the current moment. Out of efficiency this
 * is implemented in inline assembly for each CPU independently; we currently
 * don't use a generic solution for CPUs that are not yet covered by the
 * assembly code, instead an error message is prompted on compile time, forcing
 * the user to contact us.
 */
RTMathBase::time_stamp_t RTMathBase::CreateTimeStamp() {
    #if defined(__i386__) || defined(__x86_64__)
    uint64_t t;
    __asm__ __volatile__ ("rdtsc" : "=A" (t));
    return t >> 8;
    #elif defined(__ia64__)
    time_stamp_t t;
    __asm__ __volatile__ ("mov %0=ar.itc" : "=r"(t));
    return t;
    #elif defined(__powerpc__)
    time_stamp_t t;
    __asm__ __volatile__ (
        "98:    mftb %0\n"
        "99:\n"
        ".section __ftr_fixup,\"a\"\n"
        "       .long %1\n"
        "       .long 0\n"
        "       .long 98b\n"
        "       .long 99b\n"
        ".previous"
        : "=r" (t) : "i" (0x00000100)
    );
    return t;
    #elif defined(__alpha__)
    time_stamp_t t;
    __asm__ __volatile__ ("rpcc %0" : "=r"(t));
    return t;
    #elif defined(__APPLE__)
    return GetMachTime();
    #else // we don't want to use a slow generic solution
    #  error "Sorry, LinuxSampler lacks time stamp code for your system."
    #  error "Please report this error and the CPU you are using to the LinuxSampler developers mailing list!"
    #endif
}

/**
 * Will automatically be called once to initialize the 'Cents to frequency
 * ratio' table.
 */
float* RTMathBase::InitCentsToFreqTable() {
    float* pMiddleOfTable = &CentsToFreqTable[MAX_PITCH * 1200];
    for (int i = -1200; i <= 1200; i++) {
        pMiddleOfTable[i] = pow(TWELVEHUNDREDTH_ROOT_OF_TWO, i);
    }
    return pMiddleOfTable;
}
1	schoenebeck	53	/***************************************************************************
2			* *
3			* LinuxSampler - modular, streaming capable sampler *
4			* *
5	schoenebeck	56	* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	schoenebeck	53	* *
7			* This program is free software; you can redistribute it and/or modify *
8			* it under the terms of the GNU General Public License as published by *
9			* the Free Software Foundation; either version 2 of the License, or *
10			* (at your option) any later version. *
11			* *
12			* This program is distributed in the hope that it will be useful, *
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of *
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
15			* GNU General Public License for more details. *
16			* *
17			* You should have received a copy of the GNU General Public License *
18			* along with this program; if not, write to the Free Software *
19			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
20			* MA 02111-1307 USA *
21			***************************************************************************/
22
23			#include "RTMath.h"
24
25	schoenebeck	319	float RTMathBase::CentsToFreqTable[MAX_PITCH * 1200 * 2 + 1]; // +-1200 cents per octave
26			float* RTMathBase::pCentsToFreqTable(InitCentsToFreqTable());
27	schoenebeck	53
28	schoenebeck	361	#if defined(__APPLE__)
29			#include <mach/mach_time.h>
30			typedef uint64_t time_stamp_t;
31			static inline time_stamp_t GetMachTime() {
32			return (time_stamp_t) mach_absolute_time();
33			}
34			#endif
35
36	schoenebeck	328	/*
37			* Creates a real time stamp for the current moment. Out of efficiency this
38			* is implemented in inline assembly for each CPU independently; we currently
39			* don't use a generic solution for CPUs that are not yet covered by the
40			* assembly code, instead an error message is prompted on compile time, forcing
41			* the user to contact us.
42			*/
43			RTMathBase::time_stamp_t RTMathBase::CreateTimeStamp() {
44			#if defined(__i386__) \|\| defined(__x86_64__)
45			uint64_t t;
46			__asm__ __volatile__ ("rdtsc" : "=A" (t));
47			return t >> 8;
48			#elif defined(__ia64__)
49			time_stamp_t t;
50			__asm__ __volatile__ ("mov %0=ar.itc" : "=r"(t));
51			return t;
52			#elif defined(__powerpc__)
53			time_stamp_t t;
54			__asm__ __volatile__ (
55			"98: mftb %0\n"
56			"99:\n"
57			".section __ftr_fixup,\"a\"\n"
58			" .long %1\n"
59			" .long 0\n"
60			" .long 98b\n"
61			" .long 99b\n"
62			".previous"
63			: "=r" (t) : "i" (0x00000100)
64			);
65			return t;
66			#elif defined(__alpha__)
67			time_stamp_t t;
68			__asm__ __volatile__ ("rpcc %0" : "=r"(t));
69			return t;
70	schoenebeck	361	#elif defined(__APPLE__)
71			return GetMachTime();
72	schoenebeck	328	#else // we don't want to use a slow generic solution
73			# error "Sorry, LinuxSampler lacks time stamp code for your system."
74			# error "Please report this error and the CPU you are using to the LinuxSampler developers mailing list!"
75			#endif
76			}
77
78	schoenebeck	53	/**
79			* Will automatically be called once to initialize the 'Cents to frequency
80			* ratio' table.
81			*/
82	schoenebeck	319	float* RTMathBase::InitCentsToFreqTable() {
83	schoenebeck	53	float* pMiddleOfTable = &CentsToFreqTable[MAX_PITCH * 1200];
84			for (int i = -1200; i <= 1200; i++) {
85			pMiddleOfTable[i] = pow(TWELVEHUNDREDTH_ROOT_OF_TWO, i);
86			}
87			return pMiddleOfTable;
88			}