Java How to Program Fourth Edition - DCC

Chapter 22 Java Media Framework and Java Sound (on CD) 1293
49
50 if ( receiver == null ) {
51 System.err.println(
52 "Receiver unavailable for sequencer" );
53 return false;
54 }
55
56 // set receiver for transmitter to send MidiMessages
57 transmitter.setReceiver( receiver );
58
59 makeTrack();
60 }
61
62 // invalid timing division specification for new sequence
63 catch ( InvalidMidiDataException invalidMidiException ) {
64 invalidMidiException.printStackTrace();
65 return false;
66 }
67
68 // sequencer or receiver unavailable
69 catch ( MidiUnavailableException noMidiException ) {
70 noMidiException.printStackTrace();
71 return false;
72 }
73
74 // MIDI recorder initialization successful
75 return true;
76
77 } // end method initialize
78
79 // make new empty track for sequence
80 public void makeTrack()
81 {
82 // if previous track exists, delete it first
83 if ( track != null )
84 sequence.deleteTrack( track );
85
86 // create track in sequence
87 track = sequence.createTrack();
88 }
89
90 // start playback of loaded sequence
91 public void play()
92 {
93 sequencer.start();
94 }
95
96 // start recording into sequence
97 public void startRecord()
98 {
99 // load sequence into recorder and start recording
100 try {
101 sequencer.setSequence( sequence );
Fig. Fig. 22.8 22.8 MidiRecord enables a program to record a MIDI sequence (part 2 of 3).