/[svn]/linuxsampler/trunk/src/engines/common/Event.h
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Annotation of /linuxsampler/trunk/src/engines/common/Event.h

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Revision 56 - (hide annotations) (download) (as text)
Tue Apr 27 09:21:58 2004 UTC (19 years, 11 months ago) by schoenebeck
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updated copyright header for 2004

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     #ifndef __LS_EVENT_H__
24     #define __LS_EVENT_H__
25    
26     #include "../../common/global.h"
27    
28     namespace LinuxSampler {
29    
30     // just symbol prototyping
31     class Event;
32    
33     /**
34     * Generates Event objects and is responsible for resolving the position
35     * in the current audio fragment each Event actually belongs to.
36     */
37     class EventGenerator {
38     public:
39     EventGenerator(uint SampleRate);
40     void UpdateFragmentTime(uint SamplesToProcess);
41     Event CreateEvent();
42     protected:
43     typedef uint32_t time_stamp_t; ///< We read the processor's cycle count register as a reference for the real time. These are of course only abstract values with arbitrary time entity, but that's not a problem as we calculate relatively.
44     inline uint ToFragmentPos(time_stamp_t TimeStamp) {
45     return uint ((TimeStamp - FragmentTime.begin) * FragmentTime.sample_ratio);
46     }
47     friend class Event;
48     private:
49     uint uiSampleRate;
50     uint uiSamplesProcessed;
51     struct __FragmentTime__ {
52     time_stamp_t begin; ///< Real time stamp of the beginning of this audio fragment cycle.
53     time_stamp_t end; ///< Real time stamp of the end of this audio fragment cycle.
54     float sample_ratio; ///< (Samples per cycle) / (Real time duration of cycle)
55     } FragmentTime;
56     time_stamp_t CreateTimeStamp();
57     };
58    
59     /**
60     * Events are usually caused by a MIDI source or an internal modulation
61     * controller like LFO or EG. An event can only be created by an
62     * EventGenerator.
63     *
64     * @see EventGenerator
65     */
66     class Event {
67     public:
68     Event(){}
69     enum type_t {
70     type_note_on,
71     type_note_off,
72     type_pitchbend,
73     type_control_change,
74     type_cancel_release, ///< transformed either from a note-on or sustain-pedal-down event
75     type_release ///< transformed either from a note-off or sustain-pedal-up event
76     } Type;
77     enum destination_t {
78     destination_vca, ///< Volume level
79     destination_vco, ///< Pitch depth
80     destination_vcfc, ///< Filter curoff frequency
81     destination_vcfr, ///< Filter resonance
82     destination_count ///< Total number of modulation destinations (this has to stay the last element in the enum)
83     };
84     union {
85     uint8_t Key; ///< MIDI key number for note-on and note-off events.
86     uint8_t Controller; ///< MIDI controller number for control change events.
87     };
88     union {
89     uint8_t Velocity; ///< Trigger or release velocity for note-on or note-off events.
90     uint8_t Value; ///< Value for control change events.
91     };
92     int16_t Pitch; ///< Pitch value for pitchbend events.
93    
94     inline uint FragmentPos() {
95     if (iFragmentPos >= 0) return (uint) iFragmentPos;
96     return (uint) (iFragmentPos = pEventGenerator->ToFragmentPos(TimeStamp));
97     }
98     protected:
99     typedef EventGenerator::time_stamp_t time_stamp_t;
100     Event(EventGenerator* pGenerator, EventGenerator::time_stamp_t Time);
101     friend class EventGenerator;
102     private:
103     EventGenerator* pEventGenerator; ///< Creator of the event.
104     time_stamp_t TimeStamp; ///< Time stamp of the event's occurence.
105     int iFragmentPos; ///< Position in the current fragment this event refers to.
106     };
107    
108     } // namespace LinuxSampler
109    
110     #endif // __LS_EVENT_H__

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