transmit.java

是一个用java实现的

/*
 * Transmit.java
 *
 * Created on November 19, 2003, 10:38 AM
 */
package gov.nist.applet.phone.media.transmitter;

import java.awt.*;
import java.io.*;
import java.net.InetAddress;
import java.net.Socket;
import javax.media.*;
import java.util.*;
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 gov.nist.applet.phone.media.util.*;
import gov.nist.applet.phone.media.receiver.*;
import gov.nist.applet.phone.media.protocol.transport.*;

/**
 * Class to send RTP using the JMF RTP API.
 * @author DERUELLE Jean
 */
public class Transmit {
    private Processor processor = null;
    private RTPManager rtpMgrs[] = null;
    private DataSource dataOutput = null;
    private StateListener stateListener=null;
    private SessionDescription sessionDescription =null;
    private String session=null;
    private MediaLocator videoLocator=null;
    private MediaLocator audioLocator=null;
    private RTPManager rtpManager = null;
    private SessionAddress remoteAddress =null;
    private Receiver receiver=null;
    private Socket socketRTPTransmit=null;
    private Socket socketRTCPTransmit=null;
    /**
     * Constructor for Transmitter 
     * @param session - the concatened parameters of the session stored in a string
     */
    public Transmit(String session) throws IllegalArgumentException{
        this.session=session;
        stateListener=new StateListener();
        //the session Label containing the address, the port and the Time To Live
        try {
            //create a session label on the session given in argument
            // and parse the session address.
            sessionDescription =new SessionDescription(session);
            sessionDescription.setAudioFormat("6");
            sessionDescription.setVideoFormat("h263/rtp");
            sessionDescription.setTransportProtocol("udp");
        } catch (IllegalArgumentException e) {
            System.err.println("Failed to parse the session address given: " + session);
            throw e;
        }
        if(!initialize()){
            System.out.println("Bad Session intialization");
            //System.exit(0);
        }
    }

    /**
     * Constructor for Transmitter 
     * @param session - the session Description containing the address, the port, the Time To Live
     * the video format, the audio format and the transport protocol
     */
    public Transmit(SessionDescription session,Receiver receiver) {
        this.receiver=receiver;
        this.sessionDescription=session;
        stateListener=new StateListener();

        if(!initialize()){
            System.out.println("Bad Session intialization");
            //System.exit(0);
        }
    }

    /**
     * get the devices for the capture and print their formats
     * @return true if all has been initialized correctly
     */
    protected boolean initialize() {
        CaptureDeviceInfo videoCDI=null;
        CaptureDeviceInfo audioCDI=null;
        Vector captureDevices=null;
        captureDevices= CaptureDeviceManager.getDeviceList(null);
        System.out.println("- number of capture devices: "+captureDevices.size() );
        CaptureDeviceInfo cdi=null;
        for (int i = 0; i < captureDevices.size(); i++) {
        cdi = (CaptureDeviceInfo) captureDevices.elementAt(i);
        //System.out.println("    - name of the capture device: "+cdi.getName() );
            Format[] formatArray=cdi.getFormats();
            for (int j = 0; j < formatArray.length; j++) {
                Format format=formatArray[j];
                if (format instanceof VideoFormat) {
                    //System.out.println("         - format accepted by this VIDEO device: "+
                    //format.toString().trim());
                    if (videoCDI ==null) {
                        videoCDI=cdi;
                    }
               }
               else if (format instanceof AudioFormat) {
                    //System.out.println("         - format accepted by this AUDIO device: "+
                    //format.toString().trim());
                    if (audioCDI == null) {
                        audioCDI=cdi;
                    }
               }
               //else
                   //System.out.println("         - format of type UNKNOWN");
            }
        }
        if(videoCDI!=null)
            videoLocator=videoCDI.getLocator();
        if(audioCDI!=null)
            audioLocator=audioCDI.getLocator();

        return true;
    }

    /**
     * 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 localIpAddress) {
        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(localIpAddress);
        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;                
            }
            if(rtpMgrs!=null){            
				for (int i = 0; i < rtpMgrs.length; i++) {
					if(rtpMgrs[i]!=null){
						rtpMgrs[i].removeTargets( "Session ended.");
						rtpMgrs[i].dispose();
						rtpMgrs[i]=null;
					}				
				}
            }
        }
    }

    /**
     * Creates the processor
     */
    private String createProcessor() {
        DataSource audioDS=null;
        DataSource videoDS=null;
        DataSource mergeDS=null;
        StateListener stateListener=new StateListener();
        //create the DataSource
        //it can be a 'video' DataSource, an 'audio' DataSource
        //or a combination of audio and video by merging both
        if (videoLocator == null && audioLocator == null)
            return "Locator is null";
        if (audioLocator != null){
            try {	
                //create the 'audio' DataSource
                audioDS= javax.media.Manager.createDataSource(audioLocator);
            } catch (Exception e) {
                System.out.println("-> Couldn't connect to audio capture device");
            }
        }
        if (videoLocator != null){
            try {
                //create the 'video' DataSource
                videoDS = javax.media.Manager.createDataSource(videoLocator);				
            } catch (Exception e) {
                System.out.println("-> Couldn't connect to video capture device");
            }
        }
        if(videoDS!=null && audioDS!=null){
            try {
                //create the 'audio' and 'video' DataSource
                mergeDS = javax.media.Manager.createMergingDataSource(new DataSource [] {audioDS, videoDS});
            } catch (Exception e) {
                System.out.println("-> Couldn't connect to audio or video capture device");
            }
            try{
                //Create the processor from the merging DataSource
                processor = javax.media.Manager.createProcessor(mergeDS);
            }
            catch (NoProcessorException npe) {
                return "Couldn't create processor";
            } catch (IOException ioe) {
                return "IOException creating processor";
            } 
        }
        //if the processor has not been created from the merging DataSource
        if(processor==null){
            try {
                if(audioDS!=null)
                    //Create the processor from the 'audio' DataSource
                    processor = javax.media.Manager.createProcessor(audioDS);
                else
                    //Create the processor from the 'video' DataSource
                    processor = javax.media.Manager.createProcessor(videoDS);
            } catch (NoProcessorException npe) {
                return "Couldn't create processor";
            } catch (IOException ioe) {
                return "IOException creating processor";
            } 
        }

        // Wait for it to configure
        boolean result = stateListener.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=null;
        boolean atLeastOneTrack = false;

        // Program the tracks.
        for (int i = 0; i < tracks.length; i++) {
            Format format = tracks[i].getFormat();
            if (tracks[i].isEnabled()) {
                /*if (tracks[i] instanceof VideoFormat) 
                    System.out.println("Supported Video Formats :");
                else
                    System.out.println("Supported Audio Formats :");*/
                supported = tracks[i].getSupportedFormats();
                /*System.out.println("track : "+ i);
                for(int j=0;j<supported.length;j++)
                System.out.println("Supported format : "+supported[j].getEncoding());*/
                // We've set the output content to the RAW_RTP.
                // So all the supported formats should work with RTP.            

                if (supported.length > 0) {
                    for(int j=0;j<supported.length;j++){
                        //System.out.println("Supported format : "+supported[j].toString().toLowerCase());
                        if (supported[j] instanceof VideoFormat) {
                            // For video formats, we should double check the
                            // sizes since not all formats work in all sizes.
                            if(sessionDescription.getVideoFormat()!=null)
                                if(supported[j].toString().toLowerCase().indexOf(
                                    sessionDescription.getVideoFormat().toLowerCase())!=-1)
                                    chosen = checkForVideoSizes(tracks[i].getFormat(), 
                                                                supported[j]);
                        } else {
                            if(sessionDescription.getAudioFormat()!=null)
                                if(supported[j].toString().toLowerCase().indexOf(
                                sessionDescription.getAudioFormat().toLowerCase())!=-1)
                                    chosen = supported[j];