11

我似乎无法改变乐器。我切换了仪器的值,但输出没有任何不同。无论我尝试什么价值,我都只能得到一个钢琴乐器来演奏。这是下面的简单代码。有没有人有什么建议?还是我错过了仪器对象的基本原理?

import javax.sound.midi.*;
//import javax.sound.*;

public class Drum {
    static int instrument = 45;
    static int note = 100;
    static int timbre = 0;
    static int force = 100;
    public static void main(String[] args) {        
        Synthesizer synth = null;
        try {
            synth = MidiSystem.getSynthesizer();
            synth.open();
        }
        catch (Exception e) {
            System.out.println(e);
        }
        Soundbank soundbank = synth.getDefaultSoundbank();
        Instrument[] instr = soundbank.getInstruments();
        synth.loadInstrument(instr[instrument]);    //Changing this int (instrument) does nothing
        MidiChannel[] mc = synth.getChannels();
        mc[4].noteOn(note, force);
        try { Thread.sleep(1000); } 
        catch(InterruptedException e) {}
        System.out.println(instr[instrument].getName());

        synth.close();

    }
} 
4

3 回答 3

14

您需要告诉频道使用仪器。我承认我从未在 Java 中使用过 MIDI,但mc.programChange(instr.getPatch().getProgram())听起来很有希望。

于 2011-02-03T00:34:16.303 回答
5

要演奏打击乐器,您必须使用通道 10,该通道仅用于打击乐器。(http://en.wikipedia.org/wiki/General_MIDI)

例如:

int instrument = 36;

Sequence sequence = new Sequence(Sequence.PPQ, 1);

Track track = sequence.createTrack();


ShortMessage sm = new ShortMessage( );
sm.setMessage(ShortMessage.PROGRAM_CHANGE, 9, instrument, 0); //9 ==> is the channel 10.
track.add(new MidiEvent(sm, 0));

然后你添加的每个音符都会带有打击乐。

于 2011-05-10T14:35:29.953 回答
0

您需要向定序器发送程序更改事件。如何?发送短消息。

sound.setMessage(ShortMessage.PROGRAM_CHANGE, channel, instrument, channel);
            long timeStam1p = -1;
            Receiver rcv1r = MidiSystem.getReceiver();
            rcv1r.send(sound, timeStam1p);
            sound.setMessage(ShortMessage.NOTE_ON, channel, note, velocity);
            long timeStamp = -1;
            Receiver rcvr = MidiSystem.getReceiver();
            rcvr.send(sound, timeStamp);

变量为通道(int)音符(int)、乐器(int)、力度(int)。另外,我建议学习midi事件。事件是 MIDI 演奏音符、停止音符、改变乐器、改变速度、控制改变等的方式。我花了 2 年时间使用 MIDI 程序。

于 2018-08-07T19:33:31.237 回答