我是 android 编程的新手，发现自己陷入了困境。我一直在研究各种将实时视频从手机流式传输到手机的方法，并且似乎大部分都具有功能，当然最重要的部分除外：播放流。它似乎是从一部手机发送流，但第二部手机无法播放流。
这是播放方的代码
public class VideoPlayback extends Activity implements Callback {
MediaPlayer mp;
private SurfaceView mPreview;
private SurfaceHolder holder;
private TextView mTextview;
public static final int SERVERPORT = 6775;
public static String SERVERIP="192.168.1.126";
Socket clientSocket;
private Handler handler = new Handler();
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mPreview = (SurfaceView) findViewById(R.id.surfaceView1);
mTextview = (TextView) findViewById(R.id.textView1);
holder = mPreview.getHolder();
holder.addCallback(this);
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
mTextview.setText("Attempting to connect");
mp = new MediaPlayer();
Thread t = new Thread(){
public void run(){
try {
clientSocket = new Socket(SERVERIP,SERVERPORT);
handler.post(new Runnable() {
@Override
public void run() {
mTextview.setText("Connected to server");
}
});
handler.post(new Runnable() {
@Override
public void run() {
try {
ParcelFileDescriptor pfd = ParcelFileDescriptor.fromSocket(clientSocket);
pfd.getFileDescriptor().sync();
mp.setDataSource(pfd.getFileDescriptor());
pfd.close();
mp.setDisplay(holder);
mp.prepareAsync();
mp.start();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
};
t.start();
}
这是流媒体端的代码
public class VideoStreaming extends Activity{
// User Interface Elements
VideoView mView;
TextView connectionStatus;
SurfaceHolder mHolder;
// Video variable
MediaRecorder recorder;
// Networking variables
public static String SERVERIP="";
public static final int SERVERPORT = 6775;
private Handler handler = new Handler();
private ServerSocket serverSocket;
/** Called when the activity is first created. */
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Define UI elements
mView = (VideoView) findViewById(R.id.video_preview);
connectionStatus = (TextView) findViewById(R.id.connection_status_textview);
mHolder = mView.getHolder();
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
SERVERIP = "192.168.1.126";
// Run new thread to handle socket communications
Thread sendVideo = new Thread(new SendVideoThread());
sendVideo.start();
}
public class SendVideoThread implements Runnable{
public void run(){
// From Server.java
try {
if(SERVERIP!=null){
handler.post(new Runnable() {
@Override
public void run() {
connectionStatus.setText("Listening on IP: " + SERVERIP);
}
});
serverSocket = new ServerSocket(SERVERPORT);
while(true) {
//listen for incoming clients
Socket client = serverSocket.accept();
handler.post(new Runnable(){
@Override
public void run(){
connectionStatus.setText("Connected.");
}
});
try{
// Begin video communication
final ParcelFileDescriptor pfd = ParcelFileDescriptor.fromSocket(client);
handler.post(new Runnable(){
@Override
public void run(){
recorder = new MediaRecorder();
recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
recorder.setOutputFile(pfd.getFileDescriptor());
recorder.setVideoFrameRate(20);
recorder.setVideoSize(176,144);
recorder.setVideoEncoder(MediaRecorder.VideoEncoder.H263);
recorder.setPreviewDisplay(mHolder.getSurface());
try {
recorder.prepare();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
recorder.start();
}
});
} catch (Exception e) {
handler.post(new Runnable(){
@Override
public void run(){
connectionStatus.setText("Oops.Connection interrupted. Please reconnect your phones.");
}
});
e.printStackTrace();
}
}
} else {
handler.post(new Runnable() {
@Override
public void run(){
connectionStatus.setText("Couldn't detect internet connection.");
}
});
}
} catch (Exception e){
handler.post(new Runnable() {
@Override
public void run() {
connectionStatus.setText("Error");
}
});
e.printStackTrace();
}
// End from server.java
}
}
尝试创建 MediaPLayer 时收到以下错误
05-24 16:25:39.360: ERROR/MediaPlayerService(88): offset error
05-24 16:25:39.360: ERROR/MediaPlayer(11895): Unable to to create media player
05-24 16:25:39.360: WARN/System.err(11895): java.io.IOException: setDataSourceFD failed.: status=0x80000000
05-24 16:25:39.360: WARN/System.err(11895): at android.media.MediaPlayer.setDataSource(Native Method)
05-24 16:25:39.360: WARN/System.err(11895): at android.media.MediaPlayer.setDataSource(MediaPlayer.java:811)
05-24 16:25:39.360: WARN/System.err(11895): at com.conti.VideoPlayBack.VideoPlayback$1$2.run(VideoPlayback.java:63)
05-24 16:25:39.360: WARN/System.err(11895): at android.os.Handler.handleCallback(Handler.java:587)
05-24 16:25:39.360: WARN/System.err(11895): at android.os.Handler.dispatchMessage(Handler.java:92)
05-24 16:25:39.360: WARN/System.err(11895): at android.os.Looper.loop(Looper.java:132)
05-24 16:25:39.360: WARN/System.err(11895): at android.app.ActivityThread.main(ActivityThread.java:4025)
05-24 16:25:39.360: WARN/System.err(11895): at java.lang.reflect.Method.invokeNative(Native Method)
05-24 16:25:39.360: WARN/System.err(11895): at java.lang.reflect.Method.invoke(Method.java:491)
05-24 16:25:39.360: WARN/System.err(11895): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
05-24 16:25:39.360: WARN/System.err(11895): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
05-24 16:25:39.360: WARN/System.err(11895): at dalvik.system.NativeStart.main(Native Method)
有没有人可以解决这个问题？提前致谢！