*** Funny (Buffered)InputStream behavior ****

Question

Hi,
could anyone give me a hint regarding the problem I have in the following code... I have a class that calls a factory (Manager) and passes to it a FileInputStream, which is received in Manager as an InputStream. Manager on its turn encapsulates this stream in a BufferedInputStream and constructs a SamplePlayer, which has an instance variable that points to this BufferedinputStream for posterior use but when I use it in the method javax.sound.sampled.MidiSystem.getSequence(InputStream stream) I get the following Exception thrown:
=========================
javax.sound.midi.InvalidMidiDataException: could not get sequence from input stream
     at javax.sound.midi.MidiSystem.getSequence(MidiSystem.java:766)
     at org.me4se.impl.java2.media.SamplePlayer.prefetch(SamplePlayer.java:241)
     at testMIDletForm.playMedia(testMIDletForm.java:108)
     at testMIDletForm.commandAction(testMIDletForm.java:58)
     at javax.microedition.lcdui.Displayable.handleCommand(Displayable.java:174)
     at javax.microedition.lcdui.CommandList.commandAction(CommandList.java:44)
     at javax.microedition.lcdui.Displayable.handleCommand(Displayable.java:174)
     at javax.microedition.lcdui.List$1.actionPerformed(List.java:52)
     at javax.microedition.lcdui.ScmDeviceLabel.action(ScmDeviceLabel.java:54)
     at javax.microedition.lcdui.ScmDeviceLabel.mouseClicked(ScmDeviceLabel.java:104)
     at org.me4se.scm.ScmContainer.mouseClicked(ScmContainer.java:187)
     at org.me4se.scm.ScmContainer.mouseClicked(ScmContainer.java:187)
     at org.me4se.scm.ScmContainer.mouseClicked(ScmContainer.java:187)
     at org.me4se.scm.ScmContainer.mouseClicked(ScmContainer.java:187)
     at org.me4se.scm.ScmWrapper.mouseClicked(ScmWrapper.java:226)
     at java.awt.Component.processMouseEvent(Component.java:5491)
     at java.awt.Component.processEvent(Component.java:5253)
     at java.awt.Component.dispatchEventImpl(Component.java:3955)
     at java.awt.Component.dispatchEvent(Component.java:3803)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
Exception in thread "Thread-7" java.lang.IllegalStateException: Sequencer is not open
     at org.tritonus.share.midi.TSequencer.checkOpen(TSequencer.java:295)
     at org.tritonus.share.midi.TSequencer.start(TSequencer.java:233)
     at org.me4se.impl.java2.media.SamplePlayer.run(SamplePlayer.java:406)
     at java.lang.Thread.run(Thread.java:595)
=====================================================
Here is the code excerpt:
=====================================================
Manager (builds a SamplePlayer):
BufferedInputStream bis = new BufferedInputStream(stream);
aff = AudioSystem.getAudioFileFormat(bis);
strType = aff.getType().toString();
mff = MidiSystem.getMidiFileFormat(bis); --> First use of BufferedInputStream OK
SamplePlayer(bis, mff, aff, strType);
In SamplePlayer:
BufferedInputStream bufMediaStream;
this.bufMediaStream = bis;
public void prefetch() throws MediaException {
this.bufMediaStream.reset();
playSequence = MidiSystem.getSequence(bufMediaStream); => Exception thrown here!
sequencer.open();
sequencer.setSequence(playSequence);
class 3 (uses SamplePlayer):
BufferedInputStream bfis = null;
fis = new java.io.FileInputStream("C:/eclipse/workspace/smtk-gdse-demo/filesystem/0/futureal.mp3");
bfis = new BufferedInputStream(fis);
testPlayer = Manager.createPlayer(fis, null); --> Calls Manager to create player
testPlayer.realize();
testPlayer.prefetch(); ---> Calls Player.prefetch()
==================
Thanks...!

Answer 1

I get the FileInputStream here (this is a test class):
try {
               fis = new java.io.FileInputStream(
                         "C:/eclipse/workspace/smtk-gdse-demo/filesystem/0/ogg.ogg");
          } catch (java.io.FileNotFoundException fnfe) {
               fnfe.printStackTrace();
          try {
               if (fis != null) {
                    this.append("Opening audio file...");
                    //bfis = new BufferedInputStream(fis);
                    testPlayer = Manager.createPlayer(fis, null);As you can see, the stream is passed to the following class:
public static Player createPlayer(InputStream stream, String type)
    throws IOException, MediaException {
       return managerImpl.createPlayer(stream, type);
    }And passed forward to the ManagerImpl class where the BufferedInputStream is created:
public Player createPlayer(InputStream stream, String type)
               throws IOException, MediaException {
          String strType = "";
          AudioFileFormat aff = null;
          MidiFileFormat mff = null;
          BufferedInputStream bis = new BufferedInputStream(stream);
          // Guessing the type when its null:
          if (type == null) {
               try {
                    // Sampled audio:
                    aff = AudioSystem.getAudioFileFormat(bis);
                    strType = aff.getType().toString();
               } catch (UnsupportedAudioFileException uafe) {Then, on the test class, after the player is created, I have the following code:
if (testPlayer != null) {
               try {
                    this.append("Playing back file...");
                    testPlayer.realize();
                    testPlayer.prefetch();
                    testPlayer.start();
               } catch (MediaException me) {And in the player implementation, in the prefetch() we have:
public void prefetch() throws MediaException {
          if (state != REALIZED)
               throw new IllegalStateException();
          if (media.equals("audio/midi")) {
               try {
                    System.out.println("bytes: " + bufMediaStream.available());
                    playSequence = MidiSystem.getSequence(bufMediaStream);And in the last code line above I get the exception (playSequence attribution)...
The player constructor is the following:
public SamplePlayer(BufferedInputStream bis, String type)
               throws IOException, MediaException {
          if (type.equals("MIDI")) {
               media = "audio/midi";
          } else {
               media = "audio/sampled";
               try {
                    ais = AudioSystem.getAudioInputStream(bis);
               } catch (UnsupportedAudioFileException uafe) {
                    throw new MediaException(uafe.toString());
          String MIMEType = normalizeType(type);
          this.type = MIMEType;
          this.bufMediaStream = bis;
          state = UNREALIZED;
     }