1 |
/*************************************************************************** |
2 |
* * |
3 |
* LinuxSampler - modular, streaming capable sampler * |
4 |
* * |
5 |
* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck * |
6 |
* * |
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 |
#include "../../common/RTMath.h" |
28 |
|
29 |
namespace LinuxSampler { |
30 |
|
31 |
// just symbol prototyping |
32 |
class Event; |
33 |
|
34 |
/** |
35 |
* Generates Event objects and is responsible for resolving the position |
36 |
* in the current audio fragment each Event actually belongs to. |
37 |
*/ |
38 |
class EventGenerator { |
39 |
public: |
40 |
EventGenerator(uint SampleRate); |
41 |
void UpdateFragmentTime(uint SamplesToProcess); |
42 |
Event CreateEvent(); |
43 |
protected: |
44 |
typedef RTMath::time_stamp_t time_stamp_t; |
45 |
inline int32_t ToFragmentPos(time_stamp_t TimeStamp) { |
46 |
return int32_t (int32_t(TimeStamp - FragmentTime.begin) * FragmentTime.sample_ratio); |
47 |
} |
48 |
friend class Event; |
49 |
private: |
50 |
uint uiSampleRate; |
51 |
uint uiSamplesProcessed; |
52 |
struct __FragmentTime__ { |
53 |
time_stamp_t begin; ///< Real time stamp of the beginning of this audio fragment cycle. |
54 |
time_stamp_t end; ///< Real time stamp of the end of this audio fragment cycle. |
55 |
float sample_ratio; ///< (Samples per cycle) / (Real time duration of cycle) |
56 |
} FragmentTime; |
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_sysex, ///< MIDI system exclusive message |
75 |
type_cancel_release, ///< transformed either from a note-on or sustain-pedal-down event |
76 |
type_release ///< transformed either from a note-off or sustain-pedal-up event |
77 |
} Type; |
78 |
enum destination_t { |
79 |
destination_vca, ///< Volume level |
80 |
destination_vco, ///< Pitch depth |
81 |
destination_vcfc, ///< Filter curoff frequency |
82 |
destination_vcfr, ///< Filter resonance |
83 |
destination_count ///< Total number of modulation destinations (this has to stay the last element in the enum) |
84 |
}; |
85 |
union { |
86 |
/// Note-on and note-off event specifics |
87 |
struct _Note { |
88 |
uint8_t Key; ///< MIDI key number of note-on / note-off event. |
89 |
uint8_t Velocity; ///< Trigger or release velocity of note-on / note-off event. |
90 |
int8_t Layer; ///< Layer index (usually only used if a note-on event has to be postponed, e.g. due to shortage of free voices). |
91 |
int8_t ReleaseTrigger; ///< If new voice should be a release triggered voice (actually boolean field and usually only used if a note-on event has to be postponed, e.g. due to shortage of free voices). |
92 |
} Note; |
93 |
/// Control change event specifics |
94 |
struct _CC { |
95 |
uint8_t Controller; ///< MIDI controller number of control change event. |
96 |
uint8_t Value; ///< Controller Value of control change event. |
97 |
} CC; |
98 |
/// Pitchbend event specifics |
99 |
struct _Pitch { |
100 |
int16_t Pitch; ///< Pitch value of pitchbend event. |
101 |
} Pitch; |
102 |
/// MIDI system exclusive event specifics |
103 |
struct _Sysex { |
104 |
uint Size; ///< Data length (in bytes) of MIDI system exclusive message. |
105 |
} Sysex; |
106 |
} Param; |
107 |
|
108 |
inline int32_t FragmentPos() { |
109 |
if (iFragmentPos >= 0) return iFragmentPos; |
110 |
iFragmentPos = pEventGenerator->ToFragmentPos(TimeStamp); |
111 |
if (iFragmentPos < 0) iFragmentPos = 0; // if event arrived shortly before the beginning of current fragment |
112 |
return iFragmentPos; |
113 |
} |
114 |
inline void ResetFragmentPos() { |
115 |
iFragmentPos = -1; |
116 |
} |
117 |
protected: |
118 |
typedef EventGenerator::time_stamp_t time_stamp_t; |
119 |
Event(EventGenerator* pGenerator, EventGenerator::time_stamp_t Time); |
120 |
friend class EventGenerator; |
121 |
private: |
122 |
EventGenerator* pEventGenerator; ///< Creator of the event. |
123 |
time_stamp_t TimeStamp; ///< Time stamp of the event's occurence. |
124 |
int32_t iFragmentPos; ///< Position in the current fragment this event refers to. |
125 |
}; |
126 |
|
127 |
} // namespace LinuxSampler |
128 |
|
129 |
#endif // __LS_EVENT_H__ |