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| package test;
/*
* @(#)AudioTransmit.java 1.2 99/08/26
*
* Copyright (c) 1999 Sun Microsystems, Inc. All Rights Reserved.
*
* Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
* modify and redistribute this software in source and binary code form,
* provided that i) this copyright notice and license appear on all copies of
* the software; and ii) Licensee does not utilize the software in a manner
* which is disparaging to Sun.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
* NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
* LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
* OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
* LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
* INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
* CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
* OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* This software is not designed or intended for use in on-line control of
* aircraft, air traffic, aircraft navigation or aircraft communications; or in
* the design, construction, operation or maintenance of any nuclear
* facility. Licensee represents and warrants that it will not use or
* redistribute the Software for such purposes.
*/
import javax.media.*;
import javax.media.protocol.*;
import javax.media.format.*;
import javax.media.control.TrackControl;
import java.io.*;
public class AudioTransmit {
// Input MediaLocator
// Can be a file or http or capture source
private MediaLocator locator;
private String ipAddress;
private String port;
private Processor processor = null;
private DataSink rtptransmitter = null;
private DataSource dataOutput = null;
public AudioTransmit(MediaLocator locator,
String ipAddress,
String port) {
this.locator = locator;
this.ipAddress = ipAddress;
this.port = port;
}
/**
* Starts the transmission. Returns null if transmission started ok.
* Otherwise it returns a string with the reason why the setup failed.
*/
public synchronized String start() {
String result;
// Create a processor for the specified media locator
// and program it to output JPEG/RTP
result = createProcessor();
if (result != null)
return result;
// Create an RTP session to transmit the output of the
// processor to the specified IP address and port no.
result = createTransmitter();
if (result != null) {
processor.close();
processor = null;
return result;
}
// Start the transmission
processor.start();
return null;
}
/**
* Stops the transmission if already started
*/
public void stop() {
synchronized (this) {
if (processor != null) {
processor.stop();
processor.close();
processor = null;
rtptransmitter.close();
rtptransmitter = null;
}
}
}
private String createProcessor() {
if (locator == null)
return "Locator is null";
// Try to create a processor to handle the input media locator
try {
processor = Manager.createProcessor(locator);
} catch (NoProcessorException npe) {
return "Couldn't create processor";
} catch (IOException ioe) {
return "IOException creating processor";
}
// Wait for it to configure
boolean result = waitForState(processor, Processor.Configured);
if (result == false)
return "Couldn't configure processor";
// Get the tracks from the processor
TrackControl [] tracks = processor.getTrackControls();
// Do we have atleast one track?
if (tracks == null || tracks.length < 1)
return "Couldn't find tracks in processor";
boolean programmed = false;
// Search through the tracks for a audio track
for (int i = 0; i < tracks.length; i++) {
Format format = tracks[i].getFormat();
if ( tracks[i].isEnabled() &&
format instanceof AudioFormat &&
!programmed) {
// Found a audio track. Try to program it to output .au & .wav
AudioFormat ulawFormat = new AudioFormat(AudioFormat.MPEG_RTP,
44100,
16,
2);
tracks[i].setFormat(ulawFormat);
// Assume succesful
programmed = true;
} else
tracks[i].setEnabled(false);
}
if (!programmed)
return "Couldn't find audio track";
// Set the output content descriptor to RAW
ContentDescriptor cd = new ContentDescriptor(ContentDescriptor.RAW);
processor.setContentDescriptor(cd);
// Realize the processor. This will internally create a flow
// graph and attempt to create an output datasource for ULAW/RTP
// audio frames.
result = waitForState(processor, Controller.Realized);
if (result == false)
return "Couldn't realize processor";
// Get the output data source of the processor
dataOutput = processor.getDataOutput();
return null;
}
// Creates an RTP transmit data sink. This is the easiest way to create
// an RTP transmitter. The other way is to use the RTPSessionManager API.
// Using an RTP session manager gives you more control if you wish to
// fine tune your transmission and set other parameters.
private String createTransmitter() {
// Create a media locator for the RTP data sink.
// For example:
// rtp://129.130.131.132:42050/audio
String rtpURL = "rtp://" + ipAddress + ":" + port + "/audio";
System.err.println("<ATK: RTP URL: " + rtpURL + ">");
MediaLocator outputLocator = new MediaLocator(rtpURL);
// Create a data sink, open it and start transmission. It will wait
// for the processor to start sending data. So we need to start the
// output data source of the processor. We also need to start the
// processor itself, which is done after this method returns.
try {
System.err.println("<ATK: 1>");
rtptransmitter = Manager.createDataSink(dataOutput, outputLocator);
System.err.println("<ATK: 2>");
rtptransmitter.open();
System.err.println("<ATK: 3>");
rtptransmitter.start();
System.err.println("<ATK: 4>");
dataOutput.start();
System.err.println("<ATK: 5>");
} catch (MediaException me) {
System.err.println("MediaException");
System.err.println(me.getMessage());
return "Couldn't create RTP data sink";
} catch (IOException ioe) {
System.err.println("<ATK: Content - " + rtptransmitter.getContentType());
System.err.println("IOException");
System.err.println(ioe.getMessage());
return "Couldn't create RTP data sink";
}
return null;
}
/****************************************************************
* Convenience methods to handle processor's state changes.
****************************************************************/
private Integer stateLock = new Integer(0);
private boolean failed = false;
Integer getStateLock() {
return stateLock;
}
void setFailed() {
failed = true;
}
private synchronized boolean waitForState(Processor p, int state) {
p.addControllerListener(new StateListener());
failed = false;
// Call the required method on the processor
if (state == Processor.Configured) {
p.configure();
} else if (state == Processor.Realized) {
p.realize();
}
// Wait until we get an event that confirms the
// success of the method, or a failure event.
// See StateListener inner class
while (p.getState() < state && !failed) {
synchronized (getStateLock()) {
try {
getStateLock().wait();
} catch (InterruptedException ie) {
return false;
}
}
}
if (failed)
return false;
else
return true;
}
/****************************************************************
* Inner Classes
****************************************************************/
class StateListener implements ControllerListener {
public void controllerUpdate(ControllerEvent ce) {
// If there was an error during configure or
// realize, the processor will be closed
if (ce instanceof ControllerClosedEvent)
setFailed();
// All controller events, send a notification
// to the waiting thread in waitForState method.
if (ce instanceof ControllerEvent) {
synchronized (getStateLock()) {
getStateLock().notifyAll();
}
}
}
}
/****************************************************************
* Sample Usage for AudioTransmit class
****************************************************************/
public static void main(String [] args) {
// We need three parameters to do the transmission
// For example,
// java AudioTransmit file:/C:/media/test.wav 129.130.131.132 42050
if (args.length < 3) {
System.err.println("Usage: AudioTransmit <sourceURL> <destIP> <destPort>");
System.exit(-1);
}
// Create a audio transmit object with the specified params.
AudioTransmit vt = new AudioTransmit(new MediaLocator(args[0]),
args[1],
args[2]);
// Start the transmission
String result = vt.start();
// result will be non-null if there was an error. The return
// value is a String describing the possible error. Print it.
if (result != null) {
System.err.println("Error : " + result);
System.exit(0);
}
// Transmit for 50 seconds and then close the processor
// This is a safeguard when using a capture data source
// so that the capture device will be properly released
// before quitting.
// The right thing to do would be to have a GUI with a
// "Stop" button that would call stop on AudioTransmit
try {
Thread.currentThread().sleep(50000);
} catch (InterruptedException ie) {
}
// Stop the transmission
vt.stop();
System.exit(0);
}
} |
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