/[svn]/linuxsampler/trunk/src/common/RTMath.cpp
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Annotation of /linuxsampler/trunk/src/common/RTMath.cpp

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Revision 2942 - (hide annotations) (download)
Wed Jul 13 15:51:06 2016 UTC (3 years, 5 months ago) by schoenebeck
File size: 5062 byte(s)
* NKSP: Implemented built-in script variable "$KSP_TIMER".
* NKSP: Implemented built-in script variable "$NKSP_REAL_TIMER".
* NKSP: Implemented built-in script variable "$NKSP_PERF_TIMER".
* NKSP: Implemented built-in script variable "$ENGINE_UPTIME".
* Bumped version (2.0.0.svn14).

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 1212 * Copyright (C) 2005 - 2007 Christian Schoenebeck *
7 schoenebeck 53 * *
8     * This program is free software; you can redistribute it and/or modify *
9     * it under the terms of the GNU General Public License as published by *
10     * the Free Software Foundation; either version 2 of the License, or *
11     * (at your option) any later version. *
12     * *
13     * This program is distributed in the hope that it will be useful, *
14     * but WITHOUT ANY WARRANTY; without even the implied warranty of *
15     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16     * GNU General Public License for more details. *
17     * *
18     * You should have received a copy of the GNU General Public License *
19     * along with this program; if not, write to the Free Software *
20     * Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
21     * MA 02111-1307 USA *
22     ***************************************************************************/
23    
24     #include "RTMath.h"
25    
26 schoenebeck 2942 // for unsafeMicroSeconds() implementation
27     #if !defined(WIN32) && !defined(__APPLE__)
28     # include <time.h>
29     #endif
30    
31 schoenebeck 1212 static float CentsToFreqTable[CONFIG_MAX_PITCH * 1200 * 2 + 1]; // +-1200 cents per octave
32    
33 schoenebeck 319 float* RTMathBase::pCentsToFreqTable(InitCentsToFreqTable());
34 schoenebeck 53
35 schoenebeck 361 #if defined(__APPLE__)
36     #include <mach/mach_time.h>
37     typedef uint64_t time_stamp_t;
38     static inline time_stamp_t GetMachTime() {
39     return (time_stamp_t) mach_absolute_time();
40     }
41     #endif
42    
43 schoenebeck 328 /*
44     * Creates a real time stamp for the current moment. Out of efficiency this
45     * is implemented in inline assembly for each CPU independently; we currently
46     * don't use a generic solution for CPUs that are not yet covered by the
47     * assembly code, instead an error message is prompted on compile time, forcing
48     * the user to contact us.
49     */
50     RTMathBase::time_stamp_t RTMathBase::CreateTimeStamp() {
51     #if defined(__i386__) || defined(__x86_64__)
52     uint64_t t;
53     __asm__ __volatile__ ("rdtsc" : "=A" (t));
54     return t >> 8;
55     #elif defined(__ia64__)
56     time_stamp_t t;
57     __asm__ __volatile__ ("mov %0=ar.itc" : "=r"(t));
58     return t;
59     #elif defined(__powerpc__)
60     time_stamp_t t;
61     __asm__ __volatile__ (
62     "98: mftb %0\n"
63     "99:\n"
64     ".section __ftr_fixup,\"a\"\n"
65     " .long %1\n"
66     " .long 0\n"
67     " .long 98b\n"
68     " .long 99b\n"
69     ".previous"
70     : "=r" (t) : "i" (0x00000100)
71     );
72     return t;
73     #elif defined(__alpha__)
74     time_stamp_t t;
75     __asm__ __volatile__ ("rpcc %0" : "=r"(t));
76     return t;
77 schoenebeck 361 #elif defined(__APPLE__)
78     return GetMachTime();
79 schoenebeck 328 #else // we don't want to use a slow generic solution
80     # error "Sorry, LinuxSampler lacks time stamp code for your system."
81     # error "Please report this error and the CPU you are using to the LinuxSampler developers mailing list!"
82     #endif
83     }
84    
85 schoenebeck 2942 RTMathBase::usecs_t RTMathBase::unsafeMicroSeconds(clock_source_t source) {
86     #if defined(WIN32)
87     LARGE_INTEGER t;
88     LARGE_INTEGER f;
89     QueryPerformanceCounter(&t);
90     if (!QueryPerformanceFrequency(&f)) return 0;
91     return usecs_t( double(t) / double(f) * 1000000.0 );
92     #elif defined(__APPLE__)
93     static mach_timebase_info_data_t tb;
94     double t = mach_absolute_time();
95     // if this method is run for the first time, get the internal time base
96     if (!tb.denom) mach_timebase_info(&tb); // get nanoseconds per tick
97     // convert from internal (abstract) time value to microseconds
98     return usecs_t( t * double(tb.numer) / double(tb.denom) / 1000.0 );
99     #else
100     timespec t;
101     clockid_t cid;
102     switch (source) {
103     case process_clock: cid = CLOCK_PROCESS_CPUTIME_ID; break;
104     case thread_clock: cid = CLOCK_THREAD_CPUTIME_ID; break;
105     case real_clock: cid = CLOCK_MONOTONIC; break;
106     default: return 0;
107     }
108     clock_gettime(cid, &t);
109     return usecs_t( (double(t.tv_sec) * 1000000000.0 + double(t.tv_nsec)) / 1000.0 );
110     #endif
111     }
112    
113 schoenebeck 53 /**
114     * Will automatically be called once to initialize the 'Cents to frequency
115     * ratio' table.
116     */
117 schoenebeck 319 float* RTMathBase::InitCentsToFreqTable() {
118 schoenebeck 554 float* pMiddleOfTable = &CentsToFreqTable[CONFIG_MAX_PITCH * 1200];
119 persson 799 for (int i = -CONFIG_MAX_PITCH * 1200; i <= CONFIG_MAX_PITCH * 1200; i++) {
120 schoenebeck 53 pMiddleOfTable[i] = pow(TWELVEHUNDREDTH_ROOT_OF_TWO, i);
121     }
122     return pMiddleOfTable;
123     }

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