Web hosting isp - 1298 Java Media Framework and Java Sound (on
1298 Java Media Framework and Java Sound (on CD) Chapter 22 110 // send a MIDI ShortMessage using this method’s parameters 111 try { 112 message = new ShortMessage(); 113 114 // set new message of command (NOTE_ON, NOTE_OFF), 115 // note number, volume 116 message.setMessage( command, note, volume ); 117 118 // send message through receiver 119 receiver.send( message, -1 ); 120 } 121 122 // invalid message values set 123 catch ( InvalidMidiDataException badMidiException ) { 124 badMidiException.printStackTrace(); 125 } 126 127 } // end method sendMessage 128 129 } // end class MidiSynthesizer Fig. 22.9 MidiSynthesizercan generate notes and send them to another MIDI device (part 4 of 4). MidiSynthesizer s constructor (lines 29 72) acquires the synthesizer and initializes related resources. Line 34 obtains a Synthesizer object from the MidiSystem and line 38 opens the Synthesizer. To enable sounds to be played and recorded at the same time, lines 41 47 obtain the Transmitterand Receiverof the Synthesizer. When a MIDI message is sent to the synthesizer s receiver, the synthesizer executes the message s instruction, generating notes, and the transmitter sends that message to designated Receivers of other MidiDevices. Common Programming Error 22.3 A MidiUnavailableExceptionoccurs when a program attempts to acquire unavailable MidiDeviceresources such as synthesizers and transmitters. MIDI messages are sent to the MidiSynthesizer from MidiDemo as a result of either pressing a piano key or a MidiEventin the preloaded track of MidiData. A note can be generated by accessing the channels of the synthesizer directly. For simplicity, MidiSynthesizer uses only the first channel (out of a possible 16) to sound notes. Line 57 invokes Synthesizermethod getChannelsto obtain all 16 channels from synthesizer, and line 60 sets the default channel to the first channel. A MidiChannel sounds a note by calling its noteOn method with the note number (0 127) and a volume number as arguments. MidiChannel s noteOffmethod turns off a note with just the note number as an argument. MidiSynthesizer accesses these Midi- Channel methods through method midiNoteOn (lines 87 90) and method midiNoteOff(lines 93 96), respectively. A synthesizer can use its default instruments to sound notes. Line 54 obtains the default instrument available through the synthesizer or through a default sound bank by invoking Synthesizermethod getAvailableInstruments. A sound bank usually has 128 instruments. The instrument in use can be changed by invoking MidiSynthesizer
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