blob: 4906fafcf577eecc8428f4bef0f11df2a9db082d (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
package Game;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import javax.sound.midi.InvalidMidiDataException;
import javax.sound.midi.MetaEventListener;
import javax.sound.midi.MetaMessage;
import javax.sound.midi.MidiChannel;
import javax.sound.midi.MidiSystem;
import javax.sound.midi.MidiUnavailableException;
import javax.sound.midi.Sequence;
import javax.sound.midi.Sequencer;
import javax.sound.midi.Synthesizer;
/*
* Copyright 2009 Volker Oth
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Class to play Midi music.
*
* @author Volker Oth
*/
public class MidiMusic {
/** Midi sequencer */
private Sequencer sequencer;
/** flag: initialization is finished and midi file can be played */
private boolean canPlay;
/**
* Constructor.
* @param fName file name
* @throws ResourceException
* @throws LemmException
*/
public MidiMusic(final String fName) throws ResourceException, LemmException {
try {
FileInputStream f = new FileInputStream(Core.findResource(fName));
canPlay = false;
sequencer = MidiSystem.getSequencer();
if (sequencer == null) {
throw new LemmException("Midi not supported");
} else {
// Acquire resources and make operational.
sequencer.open();
}
Sequence mySeq = MidiSystem.getSequence(f);
if (sequencer != null) {
setGain(Music.getGain());
sequencer.setSequence(mySeq);
canPlay = true;
sequencer.addMetaEventListener(new MetaEventListener() {
public void meta(MetaMessage event) {
int type = event.getType();
//System.out.println("midi message: "+type+" "+event.toString());
if (type == 47) {
sequencer.setTickPosition(0);
sequencer.start();
}
}
});
}
} catch (MidiUnavailableException ex) {
throw new LemmException("Midi not supported");
} catch (InvalidMidiDataException ex) {
throw new ResourceException(fName+" (Invalid midi data)");
} catch (FileNotFoundException ex) {
throw new ResourceException(fName);
} catch (IOException ex) {
throw new ResourceException(fName+" (IO exception)");
}
}
/**
* Play current midi file.
*/
public void play() {
if (canPlay)
sequencer.start();
}
/**
* Stop current midi file.
*/
public void stop() {
if (canPlay)
sequencer.stop();
}
/**
* Close current midi file.
*/
public void close() {
stop();
if (sequencer != null)
sequencer.close();
}
/**
* Set gain (volume) of midi output
* @param gn gain factor: 0.0 (off) .. 1.0 (full volume)
*/
public void setGain(double gn) {
double gain;
if (gn > 1.0)
gain = 1.0;
else if (gn < 0)
gain = 0;
else
gain = gn;
if (sequencer != null && sequencer instanceof Synthesizer) {
Synthesizer synthesizer = (Synthesizer)sequencer;
MidiChannel[] channels = synthesizer.getChannels();
for (int i=0; i<channels.length; i++) {
channels[i].controlChange(7, (int)(gain * 127.0));
}
}
}
}
|
