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POJava midi volume control won't work
 

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  1. POJava midi volume control won't work
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    <p>I've been trying to get midi volume control to work in a MidiPlayer class for a very long time now. I've searched for examples for accomplishing this here on stackoverflow and all over the Internet, but nothing I try ever seems to work. The volume stays the same! It doesn't change like I want it to.</p> <p>I'm running Java 1.6.0_32 on Windows 7 professional. </p> <p>Here! Have an SSCCE:</p> <pre><code> import java.io.*; import javax.sound.midi.*; import java.net.URL; public class MidiSSCCE { public static void main(String[] args) { // creates the midi player and sets up its sequencer and synthesizer. MidiPlayer midiP = new MidiPlayer(); double volume = 1.0; // loads a midi from a url into the sequencer, but doesn't start playing it yet. midiP.load("http://www.vgmusic.com/music/computer/microsoft/windows/touhou_6_stage3_boss.mid",true); // set the midi to loop indefinitely. midiP.loop(-1); // start playing the midi. midiP.play(true); // while loop changes the volume of the midi while it is playing. while(true) { midiP.setVolume(volume); try { Thread.sleep(300); } catch(Exception e) {} volume -= 0.1; if(volume &lt; 0) volume += 1.0; } } } /** * MidiPlayer * author: Stephen Lindberg * Last modified: Oct 14, 2011 * * A class that allows midi files to be loaded and played. **/ class MidiPlayer { private Sequence seq; private Sequencer seqr; private Synthesizer synth; private Receiver receiver; private File midiFile; private String midiID; private boolean loaded; private boolean usingHardwareSoundbank; // CONSTRUCTORS public MidiPlayer() { loaded = false; try { // obtain the sequencer and synthesizer. seqr = MidiSystem.getSequencer(); synth = MidiSystem.getSynthesizer(); // print the user's midi device info System.out.println("Setting up Midi Player..."); System.out.println("MidiDeviceInfo: "); for(MidiDevice.Info info : MidiSystem.getMidiDeviceInfo()) { System.out.println("\t" + info.getName() + ": " +info.getDescription()); } System.out.println(); // obtain the soundbank and receiver. Soundbank soundbank = synth.getDefaultSoundbank(); if(soundbank == null) { receiver = MidiSystem.getReceiver(); usingHardwareSoundbank = true; System.out.println("using hardware soundbank"); } else { synth.loadAllInstruments(soundbank); receiver = synth.getReceiver(); usingHardwareSoundbank = false; System.out.println("using default software soundbank:" + soundbank); } seqr.getTransmitter().setReceiver(receiver); } catch(Exception e) { System.out.println("MIDI error: I just don't know what went wrong! 6_9"); } } // DATA METHODS /** * load(String fileName) * loads a midi file into this MidiPlayer. * Preconditions: fileName is the name of the midi file to be loaded. * Postconditions: fileName is loaded and is ready to be played. **/ public void load(String fileName, boolean isOnline) { this.unload(); try { URL midiURL; if(isOnline) midiURL = new URL(fileName); else midiURL = getClass().getClassLoader().getResource(fileName); seq = MidiSystem.getSequence(midiURL); seqr.open(); synth.open(); // load our sequence into the sequencer. seqr.setSequence(seq); loaded = true; } catch(IOException ioe) { System.out.println("MIDI error: Problem occured while reading " + midiFile.getName() + "."); } catch(InvalidMidiDataException imde) { System.out.println("MIDI error: " + midiFile.getName() + " is not a valid MIDI file or is unreadable."); } catch(Exception e) { System.out.println("MIDI error: I just don't know what went wrong! 6_9"); } } /** * unload() * Unloads the current midi from the MidiPlayer and releases its resources from memory. **/ public void unload() { this.stop(); seqr.close(); synth.close(); midiFile = null; loaded = false; } // OTHER METHODS /** * play(boolean reset) * plays the currently loaded midi. * Preconditions: reset tells our midi whether or nor to begin playing from the start of the midi file's current loop start point. * Postconditions: If reset is true, then the loaded midi begins playing from its loop start point (default 0). * If reset is false, then the loaded midi resumes playing from its current position. **/ public void play(boolean reset) { if(reset) seqr.setTickPosition(seqr.getLoopStartPoint()); seqr.start(); } /** * stop() * Pauses the current midi if it was playing. **/ public void stop() { if(seqr.isOpen()) seqr.stop(); } /** * isRunning() * Returns true if the current midi is playing. Returns false otherwise. **/ public boolean isRunning() { return seqr.isRunning(); } /** * loop(int times) * Sets the current midi to loop from start to finish a specific number of times. * Preconditions: times is the number of times we want our midi to loop. * Postconditions: The current midi is set to loop times times. * If times = -1, the current midi will be set to loop infinitely. **/ public void loop(int times) { loop(times,0,-1); } /** * loop(int times) * Sets the current midi to loop from a specified start point to a specified end point a specific number of times. * Preconditions: times is the number of times we want our midi to loop. * start is our loop's start point in ticks. * end is our loop's end point in ticks. * Postconditions: The current midi is set to loop from tick start to tick end times times. * If times = -1, the current midi will be set to loop infinitely. **/ public void loop(int times, long start, long end) { if(start &lt; 0) start = 0; if(end &gt; seqr.getSequence().getTickLength() || end &lt;= 0) end = seqr.getSequence().getTickLength(); if(start &gt;= end &amp;&amp; end != -1) start = end-1; seqr.setLoopStartPoint(start); seqr.setLoopEndPoint(end); if(times == -1) seqr.setLoopCount(Sequencer.LOOP_CONTINUOUSLY); else seqr.setLoopCount(times); } public void setVolume(double vol) { System.out.println("Midi volume change request: " + vol); try { if(usingHardwareSoundbank) { ShortMessage volumeMessage = new ShortMessage(); for ( int i = 0; i &lt; 16; i++ ) { volumeMessage.setMessage( ShortMessage.CONTROL_CHANGE, i, 7, (int)(vol*127) ); receiver.send( volumeMessage, -1 ); } } else { MidiChannel[] channels = synth.getChannels(); for( int c = 0; c &lt; channels.length; c++ ) { if(channels[c] != null) channels[c].controlChange( 7, (int)( vol*127) ); } } } catch ( Exception e ) { e.printStackTrace(); } } } </code></pre> <p>I've tried examples at the following sources with no success: </p> <p><a href="http://www.java2s.com/Code/Java/Development-Class/SettingtheVolumeofPlayingMidiAudio.htm" rel="nofollow noreferrer">http://www.java2s.com/Code/Java/Development-Class/SettingtheVolumeofPlayingMidiAudio.htm</a></p> <p><a href="https://stackoverflow.com/questions/8008286/how-to-controll-the-midi-channels-volume">How to controll the MIDI channel&#39;s volume</a></p> <p><a href="https://forums.oracle.com/forums/thread.jspa?messageID=5389030" rel="nofollow noreferrer">https://forums.oracle.com/forums/thread.jspa?messageID=5389030</a></p> <p><a href="https://stackoverflow.com/questions/9108996/midi-song-with-cc">MIDI Song with CC</a></p> <p><a href="http://www.codezealot.org/archives/27" rel="nofollow noreferrer">http://www.codezealot.org/archives/27</a></p> <p><a href="http://www.exampledepot.com/egs/javax.sound.midi/Volume.html" rel="nofollow noreferrer">http://www.exampledepot.com/egs/javax.sound.midi/Volume.html</a></p>
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    1. COThat's nice. Can you describe "what doesn't work"? (And perhaps put a summary in the title.)
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    2. COI forgot to put "Volume" in the title. It's the volume changing that isn't working for me. It sounds like it is actually working correctly for you?
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    3. CODoes the volume changing work if done *before* the MIDI starts to play?
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