engines/common/Event.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 "Event.h"

namespace LinuxSampler {

    /**
     * Create an EventGenerator.
     *
     * @param SampleRate - sample rate of the sampler engine's audio output
     *                     signal (in Hz)
     */
    EventGenerator::EventGenerator(uint SampleRate) {
        uiSampleRate       = SampleRate;
        uiSamplesProcessed = 0;
        FragmentTime.end   = CreateTimeStamp();
    }

    /**
     * Updates the time stamps for the beginning and end of the current audio
     * fragment. This is needed to be able to calculate the respective sample
     * point later to which an event belongs to.
     *
     * @param SamplesToProcess - number of sample points to process in this
     *                           audio fragment cycle
     */
    void EventGenerator::UpdateFragmentTime(uint SamplesToProcess) {
        // update time stamp for this audio fragment cycle
        FragmentTime.begin = FragmentTime.end;
        FragmentTime.end   = CreateTimeStamp();
        // recalculate sample ratio for this audio fragment
        time_stamp_t fragmentDuration = FragmentTime.end - FragmentTime.begin;
        FragmentTime.sample_ratio = (float) uiSamplesProcessed / (float) fragmentDuration;
        // store amount of samples to process for the next cycle
        uiSamplesProcessed = SamplesToProcess;
    }

    /**
     * Create a new event with the current time as time stamp.
     */
    Event EventGenerator::CreateEvent() {
        return Event(this, CreateTimeStamp());
    }

    /**
     * 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.
     */
    EventGenerator::time_stamp_t EventGenerator::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;
        #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 be called by an EventGenerator to create a new Event.
     */
    Event::Event(EventGenerator* pGenerator, time_stamp_t Time) {
        pEventGenerator = pGenerator;
        TimeStamp       = Time;
        iFragmentPos    = -1;
    }

} // namespace LinuxSampler
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 "Event.h"
24
25			namespace LinuxSampler {
26
27			/**
28			* Create an EventGenerator.
29			*
30			* @param SampleRate - sample rate of the sampler engine's audio output
31			* signal (in Hz)
32			*/
33			EventGenerator::EventGenerator(uint SampleRate) {
34			uiSampleRate = SampleRate;
35			uiSamplesProcessed = 0;
36			FragmentTime.end = CreateTimeStamp();
37			}
38
39			/**
40			* Updates the time stamps for the beginning and end of the current audio
41			* fragment. This is needed to be able to calculate the respective sample
42			* point later to which an event belongs to.
43			*
44			* @param SamplesToProcess - number of sample points to process in this
45			* audio fragment cycle
46			*/
47			void EventGenerator::UpdateFragmentTime(uint SamplesToProcess) {
48			// update time stamp for this audio fragment cycle
49			FragmentTime.begin = FragmentTime.end;
50			FragmentTime.end = CreateTimeStamp();
51			// recalculate sample ratio for this audio fragment
52			time_stamp_t fragmentDuration = FragmentTime.end - FragmentTime.begin;
53			FragmentTime.sample_ratio = (float) uiSamplesProcessed / (float) fragmentDuration;
54			// store amount of samples to process for the next cycle
55			uiSamplesProcessed = SamplesToProcess;
56			}
57
58			/**
59			* Create a new event with the current time as time stamp.
60			*/
61			Event EventGenerator::CreateEvent() {
62			return Event(this, CreateTimeStamp());
63			}
64
65			/**
66			* Creates a real time stamp for the current moment. Out of efficiency this
67			* is implemented in inline assembly for each CPU independently; we currently
68			* don't use a generic solution for CPUs that are not yet covered by the
69			* assembly code, instead an error message is prompted on compile time, forcing
70			* the user to contact us.
71			*/
72			EventGenerator::time_stamp_t EventGenerator::CreateTimeStamp() {
73			#if defined(__i386__) \|\| defined(__x86_64__)
74			uint64_t t;
75			__asm__ __volatile__ ("rdtsc" : "=A" (t));
76			return t >> 8;
77			#elif defined(__ia64__)
78			time_stamp_t t;
79			__asm__ __volatile__ ("mov %0=ar.itc" : "=r"(t));
80			return t;
81			#elif defined(__powerpc__)
82			time_stamp_t t;
83			__asm__ __volatile__ (
84			"98: mftb %0\n"
85			"99:\n"
86			".section __ftr_fixup,\"a\"\n"
87			" .long %1\n"
88			" .long 0\n"
89			" .long 98b\n"
90			" .long 99b\n"
91			".previous"
92			: "=r" (t) : "i" (0x00000100)
93			);
94			return t;
95			#elif defined(__alpha__)
96			time_stamp_t t;
97			__asm__ __volatile__ ("rpcc %0" : "=r"(t));
98			return t;
99			#else // we don't want to use a slow generic solution
100	schoenebeck	292	# error "Sorry, LinuxSampler lacks time stamp code for your system."
101			# error "Please report this error and the CPU you are using to the LinuxSampler developers mailing list!"
102	schoenebeck	53	#endif
103			}
104
105			/**
106			* Will be called by an EventGenerator to create a new Event.
107			*/
108			Event::Event(EventGenerator* pGenerator, time_stamp_t Time) {
109			pEventGenerator = pGenerator;
110			TimeStamp = Time;
111			iFragmentPos = -1;
112			}
113
114			} // namespace LinuxSampler