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

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Revision 2942 - (show annotations) (download)
Wed Jul 13 15:51:06 2016 UTC (3 years, 3 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 /***************************************************************************
2 * *
3 * LinuxSampler - modular, streaming capable sampler *
4 * *
5 * Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6 * Copyright (C) 2005 - 2007 Christian Schoenebeck *
7 * *
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 // for unsafeMicroSeconds() implementation
27 #if !defined(WIN32) && !defined(__APPLE__)
28 # include <time.h>
29 #endif
30
31 static float CentsToFreqTable[CONFIG_MAX_PITCH * 1200 * 2 + 1]; // +-1200 cents per octave
32
33 float* RTMathBase::pCentsToFreqTable(InitCentsToFreqTable());
34
35 #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 /*
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 #elif defined(__APPLE__)
78 return GetMachTime();
79 #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 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 /**
114 * Will automatically be called once to initialize the 'Cents to frequency
115 * ratio' table.
116 */
117 float* RTMathBase::InitCentsToFreqTable() {
118 float* pMiddleOfTable = &CentsToFreqTable[CONFIG_MAX_PITCH * 1200];
119 for (int i = -CONFIG_MAX_PITCH * 1200; i <= CONFIG_MAX_PITCH * 1200; i++) {
120 pMiddleOfTable[i] = pow(TWELVEHUNDREDTH_ROOT_OF_TWO, i);
121 }
122 return pMiddleOfTable;
123 }

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