saveasdialog.java

里面是关于jmf编程的例子,希望能给初学者带来一些帮助

        JMAppsCfg.TrackData     dataTrack;


        tabControl = new TabControl ( TabControl.ALIGN_TOP );

        nIndexAudio = 0;
        nIndexVideo = 0;
        nCount = arrTrackControls.length;
        for ( i = 0;  i < nCount;  i++ ) {
            format = arrTrackControls[i].getFormat ();
            if ( format instanceof AudioFormat ) {
                nIndexAudio++;
                if ( nAudioTrackCount < 2 )
                    strTitle = new String ( strAudio );
                else
                    strTitle = new String ( strAudio + " " + nIndexAudio );

                panelAudio = new TrackPanelAudio ( arrTrackControls[i], this );
                tabControl.addPage ( panelAudio, strTitle, imageAudioEn );
                hashtablePanelsAudio.put ( strTitle, panelAudio );

                if ( cfgJMApps != null ) {
                    dataTrack = cfgJMApps.getLastSaveFileTrackData ( strTitle );
                    if ( dataTrack != null )
                        panelAudio.setDefaults ( dataTrack.boolEnable, dataTrack.format );
                }
            }
            else if ( format instanceof VideoFormat ) {
                nIndexVideo++;
                if ( nVideoTrackCount < 2 )
                    strTitle = new String ( strVideo );
                else
                    strTitle = new String ( strVideo + " " + nIndexVideo );

                panelVideo = new TrackPanelVideo ( arrTrackControls[i], this );
                tabControl.addPage ( panelVideo, strTitle, imageVideoEn );
                hashtablePanelsVideo.put ( strTitle, panelVideo );

                if ( cfgJMApps != null ) {
                    dataTrack = cfgJMApps.getLastSaveFileTrackData ( strTitle );
                    if ( dataTrack != null )
                        panelVideo.setDefaults ( dataTrack.boolEnable, dataTrack.format );
                }
            }
        }

        return ( tabControl );
    }

    /**
    * This method is used by method init() to create the panel that contains
    * the choice of the media type for output.
    * @return       created panel
    * @exception    Exception
    */
    private Panel createPanelGeneral () throws Exception {
        Panel           panelGeneral;
        Panel           panelFormat;
        Label           label;
        String          strValue;


        panelGeneral = new Panel ( new GridLayout(0,1,4,4) );

        panelFormat = new Panel ( new BorderLayout() );
        panelGeneral.add ( panelFormat );

        label = new Label ( JMFI18N.getResource("jmstudio.saveas.format") );
        panelFormat.add ( label, BorderLayout.WEST );
        comboContentType = new Choice ();
        comboContentType.addItemListener ( this );

        for ( int i = 0; i < supportedCDs.length; i++ ) {
            if (!(supportedCDs[i] instanceof FileTypeDescriptor))
                continue;
            String ct = supportedCDs[i].getContentType();
            strValue = transCDToDesc ( ct );
            if ( nAudioTrackCount < 1 ) {
                if ( strValue.equals(STR_AIFF)
                        ||  strValue.equals(STR_GSM)
                        ||  strValue.equals(STR_WAVE)
                        ||  strValue.equals(STR_BASIC_AUDIO)
                        ||  strValue.equals(STR_MPEG_AUDIO) )
                    continue;
            }
            comboContentType.addItem ( strValue );
        }

        strValue = null;
        if ( cfgJMApps != null )
            strValue = cfgJMApps.getLastSaveFileContentType ();
        if ( strValue == null )
            strValue = transCDToDesc ( ContentDescriptor.mimeTypeToPackageName(strContentType) );
        comboContentType.select ( strValue );
        panelFormat.add ( comboContentType, BorderLayout.CENTER );

        return ( panelGeneral );
    }

    private String transCDToDesc(String strContentType) {
        if ( strContentType.equals(ContentDescriptor.mimeTypeToPackageName(FileTypeDescriptor.MSVIDEO)) )
            return ( STR_MSVIDEO );
        else if ( strContentType.equals(ContentDescriptor.mimeTypeToPackageName(FileTypeDescriptor.QUICKTIME)) )
            return ( STR_QUICKTIME );
        else if ( strContentType.equals(ContentDescriptor.mimeTypeToPackageName(FileTypeDescriptor.AIFF)) )
            return ( STR_AIFF );
        else if ( strContentType.equals(ContentDescriptor.mimeTypeToPackageName(FileTypeDescriptor.GSM)) )
            return ( STR_GSM );
        else if ( strContentType.equals(ContentDescriptor.mimeTypeToPackageName(FileTypeDescriptor.WAVE)) )
            return ( STR_WAVE );
        else if ( strContentType.equals(ContentDescriptor.mimeTypeToPackageName(FileTypeDescriptor.BASIC_AUDIO)) )
            return ( STR_BASIC_AUDIO );
        else if ( strContentType.equals(ContentDescriptor.mimeTypeToPackageName(FileTypeDescriptor.MPEG_AUDIO)) )
            return ( STR_MPEG_AUDIO );
        else
            return strContentType;
    }


    /**
    * This method is called, when the user presses button "OK". It opens system
    * FileDialog. After the user chooses the target file it initiates the saving
    * process, puts the Progress dialog on the screen, and launches the thread
    * to monitor the progress and update the Progress dialog.
    */
    private void doSave () {
        int                     i;
        MediaLocator            mediaDest;
        DataSource              dataSource;
        Object                  arrControls[];
        MonitorControl          monitorControl;
        boolean                 boolResult;
        String                  strFileContentType = null;
        AudioFormat             formatAudio;
        FileDialog              dlgFile;
        String                  strDirName = null;
        String                  strFileName = null;
        Enumeration             enumKeys;
        String                  strPanel;
        TrackPanelVideo        panelVideo;
        TrackPanelAudio        panelAudio;
        int                     nMediaDuration;
        Component               monitor = null;
        String                  strValue;
        TrackControl            trackControl;
        JMAppsCfg.TrackData   dataTrack;


        dlgFile = new FileDialog ( frameOwner, JMFI18N.getResource("jmstudio.saveas.filedialog"), FileDialog.SAVE );
        i = inputURL.indexOf ( ':' );
        if ( i > 2 )
            strFileName = inputURL.substring ( i + 1 );
        else
            strFileName = new String ( inputURL );

        if ( strFileName.indexOf('/') == 0  &&  strFileName.indexOf(':') == 2 )
            strFileName = strFileName.substring ( 1 );

        i = strFileName.lastIndexOf ( '.' );
        if ( i >= 0  &&  strContentTypeExt != null )
            strFileName = strFileName.substring ( 0, i + 1 ) + strContentTypeExt;
        else if ( i < 0 && strContentTypeExt != null )
            strFileName = "Unknown." + strContentTypeExt;

        strDirName = cfgJMApps.getLastSaveFileDir ();
        i = Math.max ( strFileName.lastIndexOf('/'), strFileName.lastIndexOf('\\') );
        if ( i > -1 ) {
            if ( strDirName == null )
                strDirName = strFileName.substring ( 0, i );
            strFileName = strFileName.substring ( i + 1 );
        }
        if ( strDirName != null )
            dlgFile.setDirectory ( strDirName );
        dlgFile.setFile ( strFileName );

        dlgFile.setVisible ( true );
        strFileName = dlgFile.getFile ();
        if ( strFileName == null  ||  strFileName.length() == 0 ) {
            // user pressed cancel on FileDialog
            return;
        }
        strDirName = dlgFile.getDirectory ();
        if ( strDirName != null ) {
            strFileName = strDirName.trim() + strFileName.trim();
            cfgJMApps.setLastSaveFileDir ( strDirName );
        }
        else
            strFileName = strFileName.trim();

        // looks like here is a good place to save default values for the next run
        if ( cfgJMApps != null ) {
            strValue = comboContentType.getSelectedItem ();
            cfgJMApps.setLastSaveFileContentType ( strValue );
        }

        setCursor ( new Cursor(Cursor.WAIT_CURSOR) );
        try {
            // configure processor
//            System.err.println("Output content type = " + strContentType);
            processor.setContentDescriptor( new FileTypeDescriptor(strContentType) );

            // go through parameters ...
            enumKeys = hashtablePanelsVideo.keys ();
            while ( enumKeys.hasMoreElements() ) {
                strPanel = (String) enumKeys.nextElement ();
                panelVideo = (TrackPanelVideo) hashtablePanelsVideo.get ( strPanel );
                panelVideo.updateTrack ();

                if ( cfgJMApps != null ) {
                    dataTrack = cfgJMApps.createTrackDataObject();
                    trackControl = panelVideo.getTrackControl ();
                    dataTrack.boolEnable = trackControl.isEnabled ();
                    dataTrack.format = trackControl.getFormat ();
                    cfgJMApps.setLastSaveFileTrackData ( dataTrack, strPanel );
                }
            }
            enumKeys = hashtablePanelsAudio.keys ();
            while ( enumKeys.hasMoreElements() ) {
                strPanel = (String) enumKeys.nextElement ();
                panelAudio = (TrackPanelAudio) hashtablePanelsAudio.get ( strPanel );
                panelAudio.updateTrack ();

                if ( cfgJMApps != null ) {
                    dataTrack = cfgJMApps.createTrackDataObject();
                    trackControl = panelAudio.getTrackControl ();
                    dataTrack.boolEnable = trackControl.isEnabled ();
                    dataTrack.format = trackControl.getFormat ();
                    cfgJMApps.setLastSaveFileTrackData ( dataTrack, strPanel );
                }
            }

            boolResult = waitForState ( processor, Processor.Realized );
            if ( boolResult == false ) {
//                MessageDialog.createErrorDialogModeless ( frameOwner,
//                                JMFI18N.getResource("jmstudio.error.processor.realize")
//                                + " " + strFailMessage );
                setCursor ( Cursor.getDefaultCursor() );
                processor.close ();
                this.dispose ();
                return;
            }
/*
            Control swc = processor.getControl("javax.media.control.StreamWriterControl");
            if (swc != null) {
                ((StreamWriterControl)swc).setStreamSizeLimit(1000000);
            }
*/
//            if ( strContentType == null )
                strFileContentType = "file:";
//            else
//                strFileContentType = "file." + strContentType + ":";

            dataSource = processor.getDataOutput ();
            mediaDest = new MediaLocator ( strFileContentType + strFileName );
            dataSink = Manager.createDataSink ( dataSource, mediaDest );
            boolSaving = true;
            monitorControl = (MonitorControl)
            processor.getControl("javax.media.control.MonitorControl");
            if (monitorControl != null)
                monitor = monitorControl.getControlComponent();

            Time duration = processor.getDuration();
            nMediaDuration = (int)duration.getSeconds();

            dataSink.addDataSinkListener(this);
            dataSink.open ();
//            if (captureFormat != null)
//                new PlayerWindow(processor, "Transcoding Processor", true, false);
//            else
                dataSink.start ();
            processor.start ();
//            dataSource.start ();

            if ( nMediaDuration > 0  &&  duration != Duration.DURATION_UNBOUNDED
                                     &&  duration != Duration.DURATION_UNKNOWN ) {
                dlgProgress = new ProgressDialog ( frameOwner,
                                JMFI18N.getResource("jmstudio.saveprogress.title"),
                                0, nMediaDuration, this );
            }
            else {
                dlgProgress = new ProgressDialog ( frameOwner,
                                JMFI18N.getResource("jmstudio.saveprogress.title"),
                                JMFI18N.getResource("jmstudio.saveprogress.label"),