# JMF摄像头

JMF摄像头

使用JMF可以同时提取视频流和音频流，然后通过数据源的混合，可以达到视频音频同时收集和播放的功能。其中主
要是通过数据源的混合，也就是视频流和音频流的数据源的混合。下面我们来写一个例子。通过开启摄像头的麦克风实
现同时收集视频和音频。：

package com.test;import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.media.ControllerEvent;
import javax.media.ControllerListener;
import javax.media.EndOfMediaEvent;
import javax.media.Manager;
import javax.media.MediaLocator;
import javax.media.Player;
import javax.media.PrefetchCompleteEvent;
import javax.media.RealizeCompleteEvent;
import javax.media.Time;
import javax.media.protocol.DataSource;public class MyVideoPlayer implements ControllerListener {public static void main(String[] args) {MyVideoPlayer sp = new MyVideoPlayer();sp.play();}private Frame f;// private Player videoplayer;// private Player audioplayer;private Player dualPlayer;private Component visual;private Component control = null;private MediaLocator mediaLocator;private MediaLocator audioLocator;public void play() {f = new Frame("MyPlayer");f.addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent we) {if (dualPlayer != null) {dualPlayer.close();}System.exit(0);}});f.setSize(500, 400);f.setVisible(true);try {mediaLocator = new MediaLocator("vfw://0");// 此类描述媒体目录的地址????audioLocator = new MediaLocator("javasound://44100");} catch (Exception e) {System.out.println(e.toString());}try {DataSource[] dataSources = new DataSource[2];dataSources[0] = Manager.createDataSource(mediaLocator);dataSources[1] = Manager.createDataSource(audioLocator);DataSource ds = Manager.createMergingDataSource(dataSources);dualPlayer = Manager.createPlayer(ds);} catch (Exception e1) {e1.printStackTrace();}dualPlayer.realize();dualPlayer.addControllerListener(this);}private int videoWidth = 0;private int videoHeight = 0;private int controlHeight = 30;private int insetWidth = 10;private int insetHeight = 30;// 监听player的相关事件public void controllerUpdate(ControllerEvent ce) {if (ce instanceof RealizeCompleteEvent) {// player实例化完成后进行player播放前预处理dualPlayer.prefetch();} else if (ce instanceof PrefetchCompleteEvent) {if (visual != null)return;// 取得player中的播放视频的组件，并得到视频窗口的大小// 然后把视频窗口的组件添加到Frame窗口中，if ((visual = dualPlayer.getVisualComponent()) != null) {Dimension size = visual.getPreferredSize();videoWidth = size.width;videoHeight = size.height;f.add(visual);} else {videoWidth = 320;}// 取得player中的视频播放控制条组件，并把该组件添加到Frame窗口中if ((control = dualPlayer.getControlPanelComponent()) != null) {controlHeight = control.getPreferredSize().height;f.add(control, BorderLayout.SOUTH);}// 设定Frame窗口的大小，使得满足视频文件的默认大小f.setSize(videoWidth + insetWidth, videoHeight + controlHeight + insetHeight);f.validate();// 启动视频播放组件开始播放dualPlayer.start();} else if (ce instanceof EndOfMediaEvent) {// 当播放视频完成后，把时间进度条恢复到开始，并再次重新开始播放dualPlayer.setMediaTime(new Time(0));// videoplayer.start();// audioplayer.start();dualPlayer.start();}}
}