How can I parse a tempo of midi using Java? -



How can I parse a tempo of midi using Java? -

i not understand how grab tempo. still utilize shitty way utilize tempo output.

i thinks using note_on & note_off timings give me real time. output still played slow in c++.

p.s. utilize 1 voice midis when playing that. (it's fun, computers in our class room playing 2+ voice music synchronized).

here code:

import java.awt.*; import java.awt.event.actionevent; import java.awt.event.actionlistener; import java.io.file; import java.io.ioexception; import javax.sound.midi.*; import javax.swing.*; import javax.swing.filechooser.filenameextensionfilter; import static java.lang.math.*; public class midireader { public static final float default_tempo = 100.0f; public static final int note_on = 0x90; public static final int note_off = 0x80; public static final float[] notes = {32.70f, 34.65f, 36.95f, 38.88f, 41.21f, 43.65f, 46.25f, 49.00f, 51.90f, 55.00f, 58.26f, 61.74f}; private jframe frame = new jframe(); private jtextarea outtext = new jtextarea(); private jpanel panel = new jpanel(); private file inputfile = null; private jbutton button = new jbutton("choose file"); private jtextfield inputtempo = new jtextfield(integer.tostring((int) default_tempo)); private float tempo = default_tempo; public void init(){ frame.setdefaultcloseoperation(jframe.exit_on_close); frame.setsize(300, 400); frame.setlocationrelativeto(null); frame.setvisible(true); frame.setlayout(new borderlayout()); panel.setlayout(new borderlayout()); panel.add(outtext, borderlayout.center); panel.add(inputtempo, borderlayout.south); frame.add(panel, borderlayout.center); button.addactionlistener(new actionlistener() { @override public void actionperformed(actionevent e) { jfilechooser fileopen = new jfilechooser(); filenameextensionfilter filter = new filenameextensionfilter( "midi files", "mid"); fileopen.setfilefilter(filter); int ret = fileopen.showdialog(null, "choose file"); if (ret == jfilechooser.approve_option) { inputfile = fileopen.getselectedfile(); } if (inputfile != null) { settempo(float.parsefloat(inputtempo.gettext())); outtext.settext(""); calculate(gettempo()); } } }); inputtempo.addactionlistener(new actionlistener() { @override public void actionperformed(actionevent e) { settempo(float.parsefloat(inputtempo.gettext())); outtext.settext(""); calculate(gettempo()); } }); frame.add(button, borderlayout.south); frame.settitle("midi c++ beep"); } public void settempo(float tempo) { this.tempo = tempo; } public float gettempo(){ homecoming this.tempo; } public float getpitch(int key){ homecoming notes[key % 12] * (float) (pow(2.0, (key / 12) - 2)); } public midireader(){ init(); } public void calculate(float tempo){ sequence sequence = null; seek { sequence = midisystem.getsequence(inputfile); } grab (invalidmididataexception e) { system.exit(0); } grab (ioexception e) { e.printstacktrace(); } (track track : sequence.gettracks()) { int key; long starttime = 0; long stoptime; (int = 0; < track.size(); i++) { midievent event = track.get(i); midimessage message = event.getmessage(); if (message instanceof shortmessage) { shortmessage sm = (shortmessage) message; switch(sm.getcommand()){ case note_on: starttime = event.gettick(); break; case note_off: stoptime = event.gettick(); key = sm.getdata1(); outtext.append( "\t" + "beep(" + getpitch(key) + ", " + (int)((stoptime - starttime) * (default_tempo / tempo)) + ");" + "\n"); break; } } } } } public static void main(string[] args){ new midireader(); } }

midi files utilize 2 values specify timing, resolution (measured in ticks per quarter note), , tempo (measured in microseconds per quarter note).

the resolution can read sequence.

the tempo specified midi messages; have search first track set_tempo meta events, alter tempo next events until next tempo event.

also see how integer value byte array returned metamessage.getdata()?, how midi tempo message apply other tracks?, , reading notes midi file using naudio.

java midi

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