Hi,
I am working on an application for format conversion of files, be it audio or video files. I tried the code Transcode.java (attached below) given in JMF, but I could only succeed in converting .wav files to .mp3 files. I have till date been unable to convert any video files from one format to another. I might be missing out on certain assumptions as to which files can be converted to the required format or not. Kindly give some sample code if anyody has any and also any suggestions please so that I can fulfill the requirement.
Also kindly suggest a possible algorithm for the problem.

Thanks,
Amit


import java.awt.*;import java.util.Vector;import java.io.File;import javax.media.*;import javax.media.control.TrackControl;import javax.media.control.QualityControl;import javax.media.Format;import javax.media.format.*;import javax.media.datasink.*;import javax.media.protocol.*;import javax.media.protocol.DataSource;import java.io.IOException;import com.sun.media.format.WavAudioFormat; /** * A sample program to transcode an input source to an output location * with different data formats. */public class Transcode implements ControllerListener, DataSinkListener { /** * Given a source media locator, destination media locator and * an array of formats, this method will transcode the source to * the dest into the specified formats. */ public boolean doIt(MediaLocator inML, MediaLocator outML, Format fmts[], int start, int end) { Processor p; try { System.err.println("- create processor for: " + inML); p = Manager.createProcessor(inML); } catch (Exception e) {
System.err.println("Yikes! Cannot create a processor from the given url: " + e); return false; } p.addControllerListener(this); /* * Put the Processor into configured state. */ p.configure(); if (!waitForState(p, p.Configured)) { System.err.println("Failed to configure the processor."); return false; } /* * Set the output content descriptor based on the media locator. */ setContentDescriptor(p, outML); /* * Program the tracks to the given output formats. */ if (!setTrackFormats(p, fmts)) return false; /* * We are done with programming the processor. Let's just * realize the it. */ p.realize(); if (!waitForState(p, p.Realized)) { System.err.println("Failed to realize the processor."); return false; } /* * Set the JPEG quality to .5. */ setJPEGQuality(p, 0.5f); /* * Now, we'll need to create a DataSink. */ DataSink dsink; if ((dsink = createDataSink(p, outML)) == null) { System.err.println("Failed to
create a DataSink for the given output MediaLocator: " + outML); return false; } dsink.addDataSinkListener(this); fileDone = false; /* * Set the start time if there's one set. */ if (start > 0) p.setMediaTime(new Time((double)start)); /* * Set the stop time if there's one set. */ if (end > 0) p.setStopTime(new Time((double)end)); System.err.println("start transcoding..."); /* * OK, we can now start the actual transcoding. */ try { p.start(); dsink.start(); } catch (IOException e) { System.err.println("IO error during transcoding"); return false; } /* * Wait for EndOfStream event. */ waitForFileDone(); /* * Cleanup. */ try { dsink.close(); } catch (Exception e) {} p.removeControllerListener(this); System.err.println("...done transcoding."); return true; } /** * Set the content descriptor based on the given output MediaLocator. */ void setContentDescriptor(Processor p, MediaLocator outML) {
ContentDescriptor cd; /* * If the output file maps to a content type, we'll try to set it on the processor. */ if ((cd = fileExtToCD(outML.getRemainder())) != null) { System.err.println("- set content descriptor to: " + cd); if ((p.setContentDescriptor(cd)) == null) { /* * The processor does not support the output content type. But we can set the content type to RAW and * see if any DataSink supports it. */ p.setContentDescriptor(new ContentDescriptor(ContentDescriptor.RAW)); } } } /** * Set the target transcode format on the processor. */ boolean setTrackFormats(Processor p, Format fmts[]) { if (fmts.length == 0) return true; TrackControl tcs[]; if ((tcs = p.getTrackControls()) == null) { /* * The processor does not support any track control. */ System.err.println("The Processor cannot transcode the tracks to the given formats"); return false; } for (int i = 0; i < fmts.length; i++) {
System.err.println("- set track format to: " + fmts); if (!setEachTrackFormat(p, tcs, fmts)) { System.err.println("Cannot transcode any track to: " + fmts); return false; } } return true; } /** * We'll loop through the tracks and try to find a track * that can be converted to the given format. */ boolean setEachTrackFormat(Processor p, TrackControl tcs[], Format fmt) { Format supported[]; Format f; for (int i = 0; i < tcs.length; i++) { supported = tcs.getSupportedFormats(); if (supported == null) continue; for (int j = 0; j < supported.length; j++) { if (fmt.matches(supported[j]) && (f = fmt.intersects(supported[j])) != null && tcs.setFormat(f) != null) { /* * Success. */ return true; } } } return false; } /** * Setting the encoding quality to the specified value on the JPEG encoder. * 0.5 is a good default. */ void setJPEGQuality(Player p, float val) { Control cs[] =
p.getControls(); QualityControl qc = null; VideoFormat jpegFmt = new VideoFormat(VideoFormat.JPEG); /* * Loop through the controls to find the Quality control for the JPEG encoder. */ for (int i = 0; i < cs.length; i++) { if (cs instanceof QualityControl && cs instanceof Owned) { Object owner = ((Owned)cs).getOwner(); /* * Check to see if the owner is a Codec. Then check for the output format. */ if (owner instanceof Codec) { Format fmts[] = ((Codec)owner).getSupportedOutputFormats(null); for (int j = 0; j < fmts.length; j++) { if (fmts[j].matches(jpegFmt)) { qc = (QualityControl)cs; qc.setQuality(val); System.err.println("- Set quality to " + val + " on " + qc); break; } } } if (qc != null) break; } } } /** * Create the DataSink. */ DataSink createDataSink(Processor p, MediaLocator outML) { DataSource ds; if ((ds = p.getDataOutput()) == null) {
System.err.println("Something is really wrong: the processor does not have an output DataSource"); return null; } DataSink dsink; try { System.err.println("- create DataSink for: " + outML); dsink = Manager.createDataSink(ds, outML); dsink.open(); } catch (Exception e) { System.err.println("Cannot create the DataSink: " + e); return null; } return dsink; } Object waitSync = new Object(); boolean stateTransitionOK = true; /** * Block until the processor has transitioned to the given state. * Return false if the transition failed. */ boolean waitForState(Processor p, int state) { synchronized (waitSync) { try { while (p.getState() < state && stateTransitionOK) waitSync.wait(); } catch (Exception e) { System.out.println("Exception 1 : " + e.getMessage()); } } return stateTransitionOK; } /** * Controller Listener. */ public void controllerUpdate(ControllerEvent evt) { if (evt instanceof ConfigureCompleteEvent || evt instanceof
RealizeCompleteEvent || evt instanceof PrefetchCompleteEvent) { synchronized (waitSync) { stateTransitionOK = true; waitSync.notifyAll(); } } else if (evt instanceof ResourceUnavailableEvent) { synchronized (waitSync) { stateTransitionOK = false; waitSync.notifyAll(); } } else if (evt instanceof EndOfMediaEvent) { evt.getSourceController().close(); } else if (evt instanceof MediaTimeSetEvent) { System.err.println("- mediaTime set: " + ((MediaTimeSetEvent)evt).getMediaTime().getSeconds()); } else if (evt instanceof StopAtTimeEvent) { System.err.println("- stop at time: " + ((StopAtTimeEvent)evt).getMediaTime().getSeconds()); evt.getSourceController().close(); } } Object waitFileSync = new Object(); boolean fileDone = false; boolean fileSuccess = true; /** * Block until file writing is done. */ boolean waitForFileDone() { System.err.print(" "); synchronized (waitFileSync) { try { while (!fileDone) {
waitFileSync.wait(1000); System.err.print("."); } } catch (Exception e) { System.out.println("Exception 2 : " + e.getMessage()); } } System.err.println(""); return fileSuccess; } /** * Event handler for the file writer. */ public void dataSinkUpdate(DataSinkEvent evt) { if (evt instanceof EndOfStreamEvent) { synchronized (waitFileSync) { fileDone = true; waitFileSync.notifyAll(); } } else if (evt instanceof DataSinkErrorEvent) { synchronized (waitFileSync) { fileDone = true; fileSuccess = false; waitFileSync.notifyAll(); } } } /** * Convert a file name to a content type. The extension is parsed * to determine the content type. */ ContentDescriptor fileExtToCD(String name) { String ext; int p; /* * Extract the file extension. */ if ((p = name.lastIndexOf('.')) < 0) return null; ext = (name.substring(p + 1)).toLowerCase(); String type; /* * Use the MimeManager to get the mime type from the file
extension. */ if ( ext.equals("mp3")) { type = FileTypeDescriptor.MPEG_AUDIO; } else { if ((type = com.sun.media.MimeManager.getMimeType(ext)) == null) return null; type = ContentDescriptor.mimeTypeToPackageName(type); } return new FileTypeDescriptor(type); } /** * Main program */ public static void main(String [] args) { String inputURL = null, outputURL = null; int mediaStart = -1, mediaEnd = -1; Vector audFmt = new Vector(), vidFmt = new Vector(); if (args.length == 0) prUsage(); /* * Parse the arguments. */ int i = 0; while (i < args.length) { if (args.equals("-v")) { i++; if (i >= args.length) prUsage(); vidFmt.addElement(args); } else if (args.equals("-a")) { i++; if (i >= args.length) prUsage(); audFmt.addElement(args); } else if (args.equals("-o")) { i++; if (i >= args.length) prUsage(); outputURL = args; } else if (args.equals("-s")) { i++; if (i >= args.length) prUsage();
Integer integer = Integer.valueOf(args); if (integer != null) mediaStart = integer.intValue(); } else if (args.equals("-e")) { i++; if (i >= args.length) prUsage(); Integer integer = Integer.valueOf(args); if (integer != null) mediaEnd = integer.intValue(); } else { inputURL = args; } i++; } if (inputURL == null) { System.err.println("No input url is specified"); prUsage(); } if (outputURL == null) { System.err.println("No output url is specified"); prUsage(); } int j = 0; Format fmts[] = new Format[audFmt.size() + vidFmt.size()]; Format fmt; /* * Parse the audio format spec. into real AudioFormat's. */ for (i = 0; i < audFmt.size(); i++) { if ((fmt = parseAudioFormat((String)audFmt.elementAt(i))) == null) { System.err.println("Invalid audio format specification: " + (String)audFmt.elementAt(i)); prUsage(); } fmts[j++] = fmt; } /* * Parse the video format spec. into real VideoFormat's. */
for (i = 0; i < vidFmt.size(); i++) { if ((fmt = parseVideoFormat((String)vidFmt.elementAt(i))) == null) { System.err.println("Invalid video format specification: " + (String)vidFmt.elementAt(i)); prUsage(); } fmts[j++] = fmt; } /* * Generate the input and output media locators. */ MediaLocator iml, oml; if ((iml = createMediaLocator(inputURL)) == null) { System.err.println("Cannot build media locator from: " + inputURL); System.exit(0); } if ((oml = createMediaLocator(outputURL)) == null) { System.err.println("Cannot build media locator from: " + outputURL); System.exit(0); } /* * Transcode with the specified parameters. */ Transcode transcode = new Transcode(); if (!transcode.doIt(iml, oml, fmts, mediaStart, mediaEnd)) { System.err.println("Transcoding failed"); } System.exit(0); } /** * Create a media locator from the given string. */ static MediaLocator createMediaLocator(String url) { MediaLocator ml;
if (url.indexOf(":") > 0 && (ml = new MediaLocator(url)) != null) return ml; if (url.startsWith(File.separator)) { if ((ml = new MediaLocator("file:" + url)) != null) return ml; } else { String file = "file:" + System.getProperty("user.dir") + File.separator + url; if ((ml = new MediaLocator(file)) != null) return ml; } return null; } /** * Parse the audio format specifier and generate an AudioFormat. * A valid audio format specifier is of the form: * [encoding]:[rate]:[sizeInBits]:[channels]:[big|little]:[signed|unsigned] */ static Format parseAudioFormat(String fmtStr) { int rate, bits, channels, endian, signed; String encodeStr = null, rateStr = null, bitsStr = null, channelsStr = null, endianStr = null, signedStr = null; /* * Parser the media locator to extract the requested format. */ if (fmtStr != null && fmtStr.length() > 0) { while (fmtStr.length() > 1 && fmtStr.charAt(0) == ':') fmtStr = fmtStr.substring(1); /* * Now
see if there's a encode rate specified. */ int off = fmtStr.indexOf(':'); if (off == -1) { if (!fmtStr.equals("")) encodeStr = fmtStr; } else { encodeStr = fmtStr.substring(0, off); fmtStr = fmtStr.substring(off + 1); /* * Now see if there's a sample rate specified */ off = fmtStr.indexOf(':'); if (off == -1) { if (!fmtStr.equals("")) rateStr = fmtStr; } else { rateStr = fmtStr.substring(0, off); fmtStr = fmtStr.substring(off + 1); /* * Now see if there's a size specified */ off = fmtStr.indexOf(':'); if (off == -1) { if (!fmtStr.equals("")) bitsStr = fmtStr; } else { bitsStr = fmtStr.substring(0, off); fmtStr = fmtStr.substring(off + 1); /* * Now see if there's channels specified. */ off = fmtStr.indexOf(':'); if (off == -1) { if (!fmtStr.equals("")) channelsStr = fmtStr; } else { channelsStr =
fmtStr.substring(0, off); fmtStr = fmtStr.substring(off + 1); /* * Now see if there's endian specified. */ off = fmtStr.indexOf(':'); if (off == -1) { if (!fmtStr.equals("")) endianStr = fmtStr.substring(off + 1); } else { endianStr = fmtStr.substring(0, off); if (!fmtStr.equals("")) signedStr = fmtStr.substring(off + 1); } } } } } } /* * Sample Rate */ rate = AudioFormat.NOT_SPECIFIED; if (rateStr != null) { try { Integer integer = Integer.valueOf(rateStr); if (integer != null) rate = integer.intValue(); } catch (Throwable t) { System.out.println("Exception 3 "); } } /* * Sample Size */ bits = AudioFormat.NOT_SPECIFIED; if (bitsStr != null) { try { Integer integer = Integer.valueOf(bitsStr); if (integer != null) bits = integer.intValue(); } catch (Throwable t) { System.out.println("Exception :4 " ); } } /* * #
of channels */ channels = AudioFormat.NOT_SPECIFIED; if (channelsStr != null) { try { Integer integer = Integer.valueOf(channelsStr); if (integer != null) channels = integer.intValue(); } catch (Throwable t) { System.out.println("Exception : 5 "); } } /* * Endian */ endian = AudioFormat.NOT_SPECIFIED; if (endianStr != null) { if (endianStr.equalsIgnoreCase("big")) endian = AudioFormat.BIG_ENDIAN; else if (endianStr.equalsIgnoreCase("little")) endian = AudioFormat.LITTLE_ENDIAN; } /* * Signed */ signed = AudioFormat.NOT_SPECIFIED; if (signedStr != null) { if (signedStr.equalsIgnoreCase("signed")) signed = AudioFormat.SIGNED; else if (signedStr.equalsIgnoreCase("unsigned")) signed = AudioFormat.UNSIGNED; } return new AudioFormat(encodeStr, rate, bits, channels, endian, signed); } /** * Parse the video format specifier and generate an VideoFormat. * A valid video format specifier is of the form: *
[encoding]:[widthXheight] */ static Format parseVideoFormat(String fmtStr) { String encodeStr = null, sizeStr = null; /* * Parser the media locator to extract the requested format. */ if (fmtStr != null && fmtStr.length() > 0) { while (fmtStr.length() > 1 && fmtStr.charAt(0) == ':') fmtStr = fmtStr.substring(1); /* * Now see if there's a encode rate specified. */ int off = fmtStr.indexOf(':'); if (off == -1) { if (!fmtStr.equals("")) encodeStr = fmtStr; } else { encodeStr = fmtStr.substring(0, off); sizeStr = fmtStr.substring(off + 1); } } if (encodeStr == null || encodeStr.equals("")) prUsage(); if (sizeStr == null) return new VideoFormat(encodeStr); int width = 320, height = 240; int off = sizeStr.indexOf('X'); if (off == -1) off = sizeStr.indexOf('x'); if (off == -1) { System.err.println("Video dimension is not correctly specified: " + sizeStr); prUsage(); } else { String widthStr =
sizeStr.substring(0, off); String heightStr = sizeStr.substring(off + 1); try { Integer integer = Integer.valueOf(widthStr); if (integer != null) width = integer.intValue(); integer = Integer.valueOf(heightStr); if (integer != null) height = integer.intValue(); } catch (Throwable t) { System.out.println("Exception : 6"); prUsage(); } return new VideoFormat(encodeStr, new Dimension(width, height), VideoFormat.NOT_SPECIFIED, // maxDataLen null, // data class VideoFormat.NOT_SPECIFIED // FrameRate ); } return null; } static void prUsage() { System.err.println("Usage: java Transcode -o <output> -a <audio format> -v <video format> -s <start time> -e <end time> <input>"); System.err.println(" <output>: input URL or file name"); System.err.println(" <input>: output URL or file name"); System.err.println(" <audio format>: [encoding]:[rate]:[sizeInBits]:[channels]:[big|little]:[signed|unsigned]");
System.err.println(" <video format>: [encoding]:[widthXheight]"); System.err.println(" <start time>: start time in seconds"); System.err.println(" <end time>: end time in seconds"); System.exit(0); }}


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