我正在使用java和JMF编写视频会议程序。我实现了AVReceive2和AVTransmit2两个类来广播来自网络摄像头的实时音频和视频。文字聊天工作得很好，但是当我在一个客户端上开始视频时，另一个客户端打印"等待RTP到达"(这是我在接收客户端没有得到任何东西时的输出)。所以问题是客户端不能向另一个发送数据。我尝试了以下方法:-在同一台机器上启动服务器和两个客户端。-使用两台或3台不同的机器连接在一个ad-hoc网络中，一台是服务器和客户端，另一台只是客户端。-同样的事情，但有3个不同的机器，1个服务器和2个客户端。-使用手动IP地址(如服务器为172.168.90.60，两个客户端为172.168.90.62和172.168.90.64，所有机器的子网掩码为255.255.0.0)。同样的问题。这是AVTransmit2类，如果你有什么建议的话。谢谢你。
AVTansmit2
import java.awt.*;
import java.io.*;
import java.net.InetAddress;
import javax.media.*;
import javax.media.protocol.*;
import javax.media.protocol.DataSource;
import javax.media.format.*;
import javax.media.control.TrackControl;
import javax.media.control.QualityControl;
import javax.media.rtp.*;
import javax.media.rtp.rtcp.*;
import com.sun.media.rtp.*;
public class AVTransmit2 {
// Input MediaLocator
// Can be a file or http or capture source
private MediaLocator locator;
private String ipAddress;
private int portBase;
private Processor processor = null;
private RTPManager rtpMgrs[];
private DataSource dataOutput = null;
public AVTransmit2(MediaLocator locator,
String ipAddress,
String pb,
Format format) {
this.locator = locator;
this.ipAddress = ipAddress;
Integer integer = Integer.valueOf(pb);
if (integer != null)
this.portBase = integer.intValue();
}
/**
* 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;
for (int i = 0; i < rtpMgrs.length; i++) {
rtpMgrs[i].removeTargets( "Session ended.");
rtpMgrs[i].dispose();
}
}
}
}
private String createProcessor() {
if (locator == null)
return "Locator is null";
DataSource ds;
DataSource clone;
try {
ds = javax.media.Manager.createDataSource(locator);
} catch (Exception e) {
return "Couldn't create DataSource";
}
// Try to create a processor to handle the input media locator
try {
processor = javax.media.Manager.createProcessor(ds);
} 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";
// 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);
processor.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();
if (tracks[i].isEnabled()) {
supported = tracks[i].getSupportedFormats();
// 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) {
if (supported[0] instanceof VideoFormat) {
// For video formats, we should double check the
// sizes since not all formats work in all sizes.
chosen = checkForVideoSizes(tracks[i].getFormat(),
supported[0]);
} else
chosen = supported[0];
tracks[i].setFormat(chosen);
System.err.println("Track " + i + " is set to transmit as:");
System.err.println(" " + chosen);
atLeastOneTrack = true;
} else
tracks[i].setEnabled(false);
} else
tracks[i].setEnabled(false);
}
if (!atLeastOneTrack)
return "Couldn't set any of the tracks to a valid RTP format";
// Realize the processor. This will internally create a flow
// graph and attempt to create an output datasource for JPEG/RTP
// audio frames.
result = waitForState(processor, Controller.Realized);
if (result == false)
return "Couldn't realize processor";
// Set the JPEG quality to .5.
setJPEGQuality(processor, 0.5f);
// Get the output data source of the processor
dataOutput = processor.getDataOutput();
return null;
}
/**
* Use the RTPManager API to create sessions for each media
* track of the processor.
*/
private String createTransmitter() {
// Cheated. Should have checked the type.
PushBufferDataSource pbds = (PushBufferDataSource)dataOutput;
PushBufferStream pbss[] = pbds.getStreams();
rtpMgrs = new RTPManager[pbss.length];
SessionAddress localAddr, destAddr;
InetAddress ipAddr;
SendStream sendStream;
int port;
SourceDescription srcDesList[];
for (int i = 0; i < pbss.length; i++) {
try {
rtpMgrs[i] = RTPManager.newInstance();
// The local session address will be created on the
// same port as the the target port. This is necessary
// if you use AVTransmit2 in conjunction with JMStudio.
// JMStudio assumes - in a unicast session - that the
// transmitter transmits from the same port it is receiving
// on and sends RTCP Receiver Reports back to this port of
// the transmitting host.
port = portBase + 2*i;
ipAddr = InetAddress.getByName(ipAddress);
localAddr = new SessionAddress( InetAddress.getLocalHost(),
port);
destAddr = new SessionAddress( ipAddr, port);
rtpMgrs[i].initialize( localAddr);
rtpMgrs[i].addTarget( destAddr);
System.err.println( "Created RTP session: " + ipAddress + " " + port);
sendStream = rtpMgrs[i].createSendStream(dataOutput, i);
sendStream.start();
} catch (Exception e) {
return e.getMessage();
}
}
return null;
}
/**
* For JPEG and H263, we know that they only work for particular
* sizes. So we'll perform extra checking here to make sure they
* are of the right sizes.
*/
Format checkForVideoSizes(Format original, Format supported) {
int width, height;
Dimension size = ((VideoFormat)original).getSize();
Format jpegFmt = new Format(VideoFormat.JPEG_RTP);
Format h263Fmt = new Format(VideoFormat.H263_RTP);
if (supported.matches(jpegFmt)) {
// For JPEG, make sure width and height are divisible by 8.
width = (size.width % 8 == 0 ? size.width :
(int)(size.width / 8) * 8);
height = (size.height % 8 == 0 ? size.height :
(int)(size.height / 8) * 8);
} else if (supported.matches(h263Fmt)) {
// For H.263, we only support some specific sizes.
if (size.width < 128) {
width = 128;
height = 96;
} else if (size.width < 176) {
width = 176;
height = 144;
} else {
width = 352;
height = 288;
}
} else {
// We don't know this particular format. We'll just
// leave it alone then.
return supported;
}
return (new VideoFormat(null,
new Dimension(width, height),
Format.NOT_SPECIFIED,
null,
Format.NOT_SPECIFIED)).intersects(supported);
}
/**
* 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[i] instanceof QualityControl &&
cs[i] instanceof Owned) {
Object owner = ((Owned)cs[i]).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[i];
qc.setQuality(val);
System.err.println("- Setting quality to " +
val + " on " + qc);
break;
}
}
}
if (qc != null)
break;
}
}
}
/****************************************************************
* 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 AVTransmit2 class
****************************************************************/
/* public static void main(String [] args) {
// We need three parameters to do the transmission
// For example,
// java AVTransmit2 file:/C:/media/test.mov 129.130.131.132 42050
if (args.length < 3) {
prUsage();
}
Format fmt = null;
int i = 0;
// Create a audio transmit object with the specified params.
AVTransmit2 at = new AVTransmit2(new MediaLocator(args[i]),
args[i+1], args[i+2], fmt);
// Start the transmission
String result = at.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);
}
System.err.println("Start transmission for 60 seconds...");
// Transmit for 60 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 AVTransmit2
try {
Thread.currentThread().sleep(60000);
} catch (InterruptedException ie) {
}
// Stop the transmission
at.stop();
System.err.println("...transmission ended.");
System.exit(0);
}
static void prUsage() {
System.err.println("Usage: AVTransmit2 <sourceURL> <destIP> <destPortBase>");
System.err.println(" <sourceURL>: input URL or file name");
System.err.println(" <destIP>: multicast, broadcast or unicast IP address for the transmission");
System.err.println(" <destPortBase>: network port numbers for the transmission.");
System.err.println(" The first track will use the destPortBase.");
System.err.println(" The next track will use destPortBase + 2 and so on.n");
System.exit(0);
}*/
}
我已经解决了这个问题，我使用的是Mac笔记本电脑，JMF不识别Mac的网络摄像头，这个框架已经6年没有更新了。要传送声音，你必须这样设置定位器MediaLocator ml = new MediaLocator("javasound://8000");作为JMF仅检测mac上8000hz的声音(不知道其他平台)最后，要传输视频文件或音频文件，它必须尊重这些格式，如果您在另一个操作系统上尝试此操作，请告诉我您的意见。