当我以不同的字节长度实时发送sysex消息时，midi流卡住了。如果我仅坚持一个字节的长度，但我要传递2种不同的sysex消息，则它会完美工作：一种用于实时参数更改，另一种用于完整补丁（备份）。
我已经通过javaFX编写了一个示例测试用例，以演示此行为。
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.geometry.Orientation;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Slider;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;
import javax.sound.midi.InvalidMidiDataException;
import javax.sound.midi.MidiDevice;
import javax.sound.midi.MidiSystem;
import javax.sound.midi.MidiUnavailableException;
import javax.sound.midi.Receiver;
import javax.sound.midi.ShortMessage;
import javax.sound.midi.SysexMessage;
import static javax.sound.midi.SysexMessage.SYSTEM_EXCLUSIVE;
public class MidiTestEnvironment extends Application {
public static MidiDevice.Info[] infos = MidiSystem.getMidiDeviceInfo();
public static MidiDevice outputDevice;
public static Receiver outputReceiver;
public static final byte DEVICE_NUMBER = 76;
@Override
public void start(Stage primaryStage) {
// Show output devices only. Replace the DEVICE_NUMBER constant with a working
// output midi device number.
printOutputDevices();
// Set the output device and open it first, then set the receiver.
try {
outputDevice = MidiSystem.getMidiDevice(MidiSystem.getMidiDeviceInfo()[DEVICE_NUMBER]);
if (!(outputDevice.isOpen())){
outputDevice.open();
}
outputReceiver = outputDevice.getReceiver();
System.out.println("outputreciever: " + outputDevice.getDeviceInfo().getName());
} catch (MidiUnavailableException ex) {
Logger.getLogger(MidiTestEnvironment.class.getName()).log(Level.SEVERE, null, ex);
}
// Create a Button and send a Message to the defined Midi Out
Button btn1 = new Button("Send Message 82 bytes !");
btn1.setOnAction((ActionEvent event) -> {
try {
// sendControlMessage(7,50);
sendSysexMessage(SysexJX8P_APN(), SysexJX8P_APN().length);
System.out.println("Hello World!");
} catch (InvalidMidiDataException ex) {
Logger.getLogger(MidiTestEnvironment.class.getName()).log(Level.SEVERE, null, ex);
}
});
// Create a Slider and send a Message to the defined Midi Out
Slider sysexSlider = new Slider(0,127,0);
sysexSlider.setMaxHeight(200);
sysexSlider.setOrientation(Orientation.VERTICAL);
sysexSlider.valueProperty().addListener((value,oldValue,newValue)->{
try {
sendSysexMessage(SysexJX8P_L1(20,newValue.byteValue()),10);
} catch (InvalidMidiDataException ex) {
Logger.getLogger(MidiTestEnvironment.class.getName()).log(Level.SEVERE, null, ex);
}
});
// Cobble the gui together
HBox root = new HBox();
root.setSpacing(20);
root.getChildren().addAll(btn1,sysexSlider);
Scene scene = new Scene(root, 300, 250);
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
//-------------------------------------------------------------------------------------------------------------------------------
//-- SETUP MIDI MESSAGES
//-------------------------------------------------------------------------------------------------------------------------------
public static void sendControlMessage(int controller, int value) throws MidiUnavailableException {
ShortMessage controlMessage = new ShortMessage();
try {
controlMessage.setMessage(ShortMessage.CONTROL_CHANGE, controller, value);
} catch (InvalidMidiDataException ex) {
Logger.getLogger(MidiTestEnvironment.class.getName()).log(Level.SEVERE, null, ex);
}
outputReceiver.send(controlMessage, -1);
}
public static void sendSysexMessage(byte[] data, int length) throws InvalidMidiDataException {
SysexMessage sysexMessage = new SysexMessage();
try {
sysexMessage.setMessage(data, length);
outputReceiver.send(sysexMessage, -1);
} catch (InvalidMidiDataException ex) {
Logger.getLogger(MidiTestEnvironment.class.getName()).log(Level.SEVERE, null, ex);
}
}
//-------------------------------------------------------------------------------------------------------------------------------
// DISPLAY OUTPUT DEVICES ONLY
public static void printOutputDevices() {
for (int i = 0; i < MidiSystem.getMidiDeviceInfo().length; i++) {
try {
if (MidiSystem.getMidiDevice(infos[i]).getMaxReceivers() == -1
&& !MidiSystem.getMidiDevice(infos[i]).getDeviceInfo().getName().equals("Gervill"))
{
System.out.println(infos[i].getName() + " - " + infos[i].getDescription() + " | device Number: " + i);
}
} catch (MidiUnavailableException ex) {
Logger.getLogger(MidiTestEnvironment.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
//-------------------------------------------------------------------------------------------------------------------------------
//-- TEST SYSEX MESSAGES
//-------------------------------------------------------------------------------------------------------------------------------
public static final byte[] SysexJX8P_L1(int p_byteEight, byte v_byteNine) {
byte[] sysexStringL1 = new byte[10];
sysexStringL1[0] = (byte) (SYSTEM_EXCLUSIVE & 0xFF);
sysexStringL1[1] = 0x41;
sysexStringL1[2] = 0x36;
sysexStringL1[3] = 0x00;
sysexStringL1[4] = 0x21;
sysexStringL1[5] = 0x20;
sysexStringL1[6] = 0x01;
sysexStringL1[7] = (byte) p_byteEight;
sysexStringL1[8] = v_byteNine;
sysexStringL1[9] = (byte) (ShortMessage.END_OF_EXCLUSIVE & 0xFF);
return sysexStringL1;
}
public static final byte[] SysexJX8P_APN() {
byte[] sysExStringAP = {(byte) (SYSTEM_EXCLUSIVE & 0xFF), 0x41, 0x35, 0x00, 0x21, 0x20, 0x00, 0x00, 0x20, 0x00, 0x20, 0x00, 0x20, 0x00,
0x20, 0x00, 0x20, 0x00, 0x20, 0x00, 0x20, 0x00, 0x20, 0x00, 0x20, 0x00, 0x20, 0x00, 0x20, 0x00, 0x20, 0x00,
0x20, 0x00, 0x20, 0x00, 0x20, 0x00, 0x20, 0x00, 0x20, 0x00, 0x20, 0x00, 0x20, 0x00, 0x20, 0x00,
0x20, 0x00, 0x20, 0x00, 0x20, 0x00, 0x20, 0x00, 0x20, 0x00, 0x20, 0x00, 0x20, 0x00, 0x20, 0x00,
0x20, 0x00, 0x20, 0x00, 0x20, 0x00, 0x20, 0x00, 0x20, 0x00, 0x20, 0x00, 0x20, 0x00, 0x20, 0x00, (byte) (ShortMessage.END_OF_EXCLUSIVE & 0xFF)};
return sysExStringAP;
}
}
最佳答案
我在jdk 8和jdk 13中也遇到了类似的问题。
通过关闭和打开围绕sysex传输的MIDI设备来解决：
midiout.open();
midiout.getReceiver().send(outMsg, timeStamp);
midiout.close();