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Re: Why do I need a QTCanvas (JCanvas) for audio?

I saw this with streaming files - a known old bug-
that you could only "play" a streaming file if
it was "displayed"... I am not sure if that was ever fixed...

but I never saw this problem for non-streaming files...

Jennifer

On Thu, 6 Feb 2003, Noel Murphy wrote:

> Today I found a peculiar problem where my audio only files (.wav, or .mov
> with only an audio track), would only play a few seconds of audio and then
> go silent. What I discovered is that they continue to play, and reach the
> end like normal but you can no longer hear it.
>
> I then took the "PlayMovie" example right from the Apple developer website,
> and striped it down to the code below.
> Why is it that I need a QTCanvas in order to play an audio only file?? If I
> uncomment the 3 lines containing the myQTCanvas variable, I can hear the
> whole .wav file playing. If I leave them commented, it plays about 3 seconds
> and goes silent.
> Is this a bug?
> I'm using windows 2000, JDK 1.3.1_06
>
>
> Noel Murphy
>
> /*
> * QuickTime for Java SDK Sample Code
>
> Usage subject to restrictions in SDK License Agreement
> * Copyright: ) 1996-1999 Apple Computer, Inc.
>
> */
> public class PlayMovie extends Frame implements Errors {
> public static void main (String args[]) {
> try {
> QTSession.open();
> // make a window and show it - we only have one window/one movie at a
> time
> PlayMovie pm = new PlayMovie("QT in Java");
> pm.show();
> pm.toFront();
> } catch (QTException e) {
> // at this point we close down QT if an exception is generated because it
> means
> // there was a problem with the initialization of QT>
> e.printStackTrace();
> QTSession.close ();
> }
> }
>
> public PlayMovie (String title) {
> super (title);
> // myQTCanvas = new QTCanvas();
>
> // add(myQTCanvas);
> addWindowListener(new WindowAdapter () {
> public void windowClosing (WindowEvent e) {
> goAway();
> }
>
> public void windowClosed (WindowEvent e) {
> System.exit(0);
> }
> });
>
> createNewMovieFromURL("C:\\venus.wav");
> }
>
> private QTDrawable myPlayer;
> private Movie m;
> private QTCanvas myQTCanvas;
>
> // This will resize the window to the size of the new movie
> public void createNewMovieFromURL (String theURL) {
> try {
> QTFile qtFile = new QTFile(new File(theURL));
> m = Movie.fromFile(OpenMovieFile.asRead(qtFile));
>
> myPlayer = new MoviePlayer (m);
>
> // myQTCanvas.setClient (myPlayer, true);
>
> // this will set the size of the enclosing frame to the size of the
> incoming movie
> pack();
>
> //no user control over MoviePlayer or MoviePresenter so set rate
> if (true)
> ((Playable)myPlayer).setRate(1);
>
> } catch (QTException err) {
> err.printStackTrace();
> }
> }
>
> public static void goAway () {
> QTSession.close();
> System.exit(0);
> }
> }
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References: 
 >Why do I need a QTCanvas (JCanvas) for audio? (From: "Noel Murphy" <email@hidden>)



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