engines/common/Event.cpp

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
 *   Copyright (C) 2005, 2006 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   = RTMath::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   = RTMath::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, RTMath::CreateTimeStamp());
    }

    /**
     * Create a new event for the given sample point position in the current
     * audio fragment.
     *
     * @param FragmentPos - actual sample point position in the current
     *                      audio fragment to which the new event belongs to
     */
    Event EventGenerator::CreateEvent(int32_t FragmentPos) {
        return Event(this, FragmentPos);
    }

    /**
     * Will be called by an EventGenerator to create a new Event.
     * This Constructor expects a time stamp. The actual sample point
     * position to which this event belongs to will be calculated later
     * when FragmentPos() was called the first time.
     *
     * @param pGenerator - creator of this event
     * @param Time       - time stamp on which this event occured
     */
    Event::Event(EventGenerator* pGenerator, time_stamp_t Time) {
        pEventGenerator = pGenerator;
        TimeStamp       = Time;
        iFragmentPos    = -1;
    }

    /**
     * Will be called by an EventGenerator to create a new Event.
     * This constructor expects the final sample point position to which
     * this event belongs to.
     *
     * @param pGenerator  - creator of this event
     * @param FragmentPos - actual sample point position in the current
     *                      audio fragment to which this event belongs to
     */
    Event::Event(EventGenerator* pGenerator, int32_t FragmentPos) {
        pEventGenerator = pGenerator;
        iFragmentPos    = FragmentPos;
    }

} // namespace LinuxSampler
1	/***************************************************************************
2	* *
3	* LinuxSampler - modular, streaming capable sampler *
4	* *
5	* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	* Copyright (C) 2005, 2006 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 "Event.h"
25
26	namespace LinuxSampler {
27
28	/**
29	* Create an EventGenerator.
30	*
31	* @param SampleRate - sample rate of the sampler engine's audio output
32	* signal (in Hz)
33	*/
34	EventGenerator::EventGenerator(uint SampleRate) {
35	uiSampleRate = SampleRate;
36	uiSamplesProcessed = 0;
37	FragmentTime.end = RTMath::CreateTimeStamp();
38	}
39
40	/**
41	* Updates the time stamps for the beginning and end of the current audio
42	* fragment. This is needed to be able to calculate the respective sample
43	* point later to which an event belongs to.
44	*
45	* @param SamplesToProcess - number of sample points to process in this
46	* audio fragment cycle
47	*/
48	void EventGenerator::UpdateFragmentTime(uint SamplesToProcess) {
49	// update time stamp for this audio fragment cycle
50	FragmentTime.begin = FragmentTime.end;
51	FragmentTime.end = RTMath::CreateTimeStamp();
52	// recalculate sample ratio for this audio fragment
53	time_stamp_t fragmentDuration = FragmentTime.end - FragmentTime.begin;
54	FragmentTime.sample_ratio = (float) uiSamplesProcessed / (float) fragmentDuration;
55	// store amount of samples to process for the next cycle
56	uiSamplesProcessed = SamplesToProcess;
57	}
58
59	/**
60	* Create a new event with the current time as time stamp.
61	*/
62	Event EventGenerator::CreateEvent() {
63	return Event(this, RTMath::CreateTimeStamp());
64	}
65
66	/**
67	* Create a new event for the given sample point position in the current
68	* audio fragment.
69	*
70	* @param FragmentPos - actual sample point position in the current
71	* audio fragment to which the new event belongs to
72	*/
73	Event EventGenerator::CreateEvent(int32_t FragmentPos) {
74	return Event(this, FragmentPos);
75	}
76
77	/**
78	* Will be called by an EventGenerator to create a new Event.
79	* This Constructor expects a time stamp. The actual sample point
80	* position to which this event belongs to will be calculated later
81	* when FragmentPos() was called the first time.
82	*
83	* @param pGenerator - creator of this event
84	* @param Time - time stamp on which this event occured
85	*/
86	Event::Event(EventGenerator* pGenerator, time_stamp_t Time) {
87	pEventGenerator = pGenerator;
88	TimeStamp = Time;
89	iFragmentPos = -1;
90	}
91
92	/**
93	* Will be called by an EventGenerator to create a new Event.
94	* This constructor expects the final sample point position to which
95	* this event belongs to.
96	*
97	* @param pGenerator - creator of this event
98	* @param FragmentPos - actual sample point position in the current
99	* audio fragment to which this event belongs to
100	*/
101	Event::Event(EventGenerator* pGenerator, int32_t FragmentPos) {
102	pEventGenerator = pGenerator;
103	iFragmentPos = FragmentPos;
104	}
105
106	} // namespace LinuxSampler