jvidcap.java

一个初级的远程视频系统的代码

package video.client;



import javax.media.*;
import javax.media.protocol.*;
import javax.media.control.*;
import javax.media.format.*;
import java.awt.*;
import com.sun.media.controls.VFlowLayout; // Lays components one below the other
import java.awt.event.*;
import java.util.*;


public class JVidCap{

    // GUI components
    RTPTransmit rtpTransmit;
    Processor processor = null;
    DataSource datasource = null;
    String outputType = "video.quicktime";
    public JVidCap(String ipAddr,String port) {
    	startMonitoring();
        rtpTransmit = new RTPTransmit(processor,ipAddr,port);
        rtpTransmit.start();
        
    }
    private Processor startMonitoring() {
        // Close the previous processor, which in turn closes the capture device
        if (processor != null) {
            processor.stop();
            processor.close();
        }
        // Remove the previous monitor
       
        AudioFormat af = null;
        VideoFormat vf = null;

            // Need audio得到音频的信息
            int samplingRate = 8000;
            int samplingSize = 8;
            int channels = 1;
            af = new AudioFormat(AudioFormat.LINEAR, samplingRate, samplingSize,
                                 channels);

        //得到视频文件的信息
            String encoding = "RGB";
            
            int sizeX = 160;
            int sizeY = 120;
            Dimension size = new Dimension(sizeX, sizeY);

            vf = new VideoFormat(encoding, size, Format.NOT_SPECIFIED,
                                 null, 15f);
        

        // Use CaptureUtil to create a monitored capture datasource
        datasource = CaptureUtil.getCaptureDS(vf, af);//得到捕获数据源

        if (datasource != null) {
            
            try {
                processor = javax.media.Manager.createProcessor(datasource);
                return processor;
            } catch (Exception me) {
                System.err.println(me);
                // Make sure the capture devices are released
                datasource.disconnect();
                return null;
            }

            
        }
         return null;
    }

   

    private void pauseCapture() {
        processor.stop();
    }

    private void resumeCapture() {
        processor.start();
    }

    private void stopCapture() {
        // Stop the capture and the file writer (DataSink)
        processor.stop();
        processor.close();
        processor = null;
        // Restart monitoring
    }


    

    void exit() {
        if (processor != null)
            processor.close();
        rtpTransmit.stop();
        System.exit(0);
    }
}