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基本思路是訪問.mp3文件並通過RTP流將其發送到其他客戶端，他們將要播放該歌曲。MP3將不會與JMF流
這裏是RTPServer.java，我在網上找到它並根據我的喜好進行了修改。
package server;
import java.net.InetAddress;
import javax.media.rtp.*;
import javax.media.rtp.rtcp.*;
import javax.media.*;
import javax.media.protocol.*;
import javax.media.control.*;
public class RTPServer implements ControllerListener, Runnable {
private boolean realized = false;
private boolean configured = false;
private String ipAddress;
Processor p;
MediaLocator src;
public static void main (String[] args) {
RTPServer rtp = new RTPServer("192.168.1.101", "04 - Blue.mp3");
Thread t = new Thread(rtp);
t.start();
}
public RTPServer(String ip, String song) {
ipAddress = ip;
String srcFile = "Muzika\\" + song;
src = new MediaLocator("file:" + srcFile);
}
private void setTrackFormat(Processor p) {
// Get the tracks from the processor
TrackControl [] tracks = p.getTrackControls();
// Do we have atleast one track?
if (tracks == null || tracks.length < 1) {
System.out.println("Couldn't find tracks in processor");
System.exit(1);
}
// Set the output content descriptor to RAW_RTP
// This will limit the supported formats reported from
// Track.getSupportedFormats to only valid RTP formats.
ContentDescriptor cd = new ContentDescriptor(ContentDescriptor.RAW_RTP);
p.setContentDescriptor(cd);
Format supported[];
Format chosen;
boolean atLeastOneTrack = false;
// Program the tracks.
for (int i = 0; i < tracks.length; i++) {
Format format = tracks[i].getFormat();
System.out.println("Trenutni format je " +format.getEncoding());
if (tracks[i].isEnabled()) {
supported = tracks[i].getSupportedFormats();
for (int n = 0; n < supported.length; n++)
System.out.println("Supported format: " + supported[n]);
// We've set the output content to the RAW_RTP.
// So all the supported formats should work with RTP.
// We'll just pick the first one.
if (supported.length > 0) {
chosen = supported[0]; // this is where I tried changing formats
tracks[i].setFormat(chosen);
System.err.println("Track " + i + " is set to transmit as: " +chosen);
atLeastOneTrack = true;
} else
tracks[i].setEnabled(false);
} else
tracks[i].setEnabled(false);
}
}
private void transmit(Processor p) {
try {
DataSource output = p.getDataOutput();
PushBufferDataSource pbds = (PushBufferDataSource) output;
RTPManager rtpMgr = RTPManager.newInstance();
SessionAddress localAddr, destAddr;
SendStream sendStream;
int port = 42050;
SourceDescription srcDesList[];
localAddr = new SessionAddress(InetAddress.getLocalHost(), port);
InetAddress ipAddr = InetAddress.getByName(ipAddress);
destAddr = new SessionAddress(ipAddr, port);
rtpMgr.initialize(localAddr);
rtpMgr.addTarget(destAddr);
sendStream = rtpMgr.createSendStream(output, 0);
sendStream.start();
System.err.println("Created RTP session: " + ipAddress + " " + port);
p.start();
} catch(Exception e) {
e.printStackTrace();
}
}
public synchronized void controllerUpdate(ControllerEvent evt) {
if (evt instanceof RealizeCompleteEvent) {
realized = true;
} else if (evt instanceof ConfigureCompleteEvent) {
configured = true;
} else if (evt instanceof EndOfMediaEvent) {
System.exit(0);
} else {
// System.out.println(evt.toString());
}
}
public void run() {
try {
p = Manager.createProcessor(src);
p.addControllerListener(this);
p.configure();
while (! configured) {
try {
Thread.currentThread().sleep(100L);;
} catch (InterruptedException e) {
// ignore
}
}
setTrackFormat(p);
p.setContentDescriptor(new ContentDescriptor(ContentDescriptor.RAW_RTP));
p.realize();
while (! realized) {
try {
Thread.currentThread().sleep(100L);;
} catch (InterruptedException e) {
// ignore
}
}
transmit(p);
} catch(Exception e) {
e.printStackTrace();
System.exit(1);
}
}
}
，這裏是接收端，RTPClient：
package client;
import javax.media.*;
public class RTPClient implements ControllerListener, Runnable {
Player p;
MediaLocator src;
public static void main(String[] args) {
RTPClient rtp = new RTPClient("192.168.1.100");
Thread t = new Thread(rtp);
t.start();
}
public RTPClient(String ip) {
String srcUrl = "rtp://" + ip + ":42050/audio/1";
DataSink sink;
src = new MediaLocator(srcUrl);
}
public void run() {
try {
p = Manager.createPlayer(src);
p.addControllerListener(this);
p.start();
} catch(Exception e) {
e.printStackTrace();
System.exit(1);
}
}
public synchronized void controllerUpdate(ControllerEvent evt) {
if (evt instanceof EndOfMediaEvent) {
System.exit(0);
} else {
System.out.println(evt.toString());
}
}
}
我算了一下，它成功地發送任何文件讓我選擇，但是當我送MP3播放，客戶端將無法播放。我得到：
RTP Handler internal error:
javax.media.ControllerErrorEvent[[email protected],message=Internal
module [email protected]: failed to handle a data
format change!]
有趣的是，.wav發送完美。所以我的猜測是在發送之前設置的格式。我嘗試將格式更改爲其他支持的格式，但後來我遇到了其他一些錯誤。
Failed to build a graph for the given custom options.
Failed to realize: [email protected]
Cannot build a flow graph with the customized options:
Unable to transcode format: mpegaudio, 48000.0 Hz, 16-bit, Stereo, LittleEndian, Signed, 20000.0 frame rate, FrameSize=11264 bits
to: ULAW/rtp, 8000.0 Hz, 8-bit, Stereo
outputting to: RAW/RTP
Error: Unable to realize [email protected]
最後，我打開JMStudio的（內置的應用程序發送/ JMF在接受媒體流），當我嘗試流.MP3，我得到確切同樣的錯誤運行我的應用程序時。 JMF設置正常，我檢查了PATH和CLASSPATH，同時我安裝了mp3plugin，它也安裝正常。一切似乎都很好，但它不起作用！至少.mp3不是。 那麼，我該如何讓.mp3「走到另一頭」呢？
客戶端/服務器是否必須處於不同的IP位置，還是都在同一個位置工作，即本地主機/ – LmC 2013-04-18 11:22:08