问题描述
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我是android编程的新手,发现自己陷入困境,我一直在研究各种方法来在手机之间流传输实时视频,并且似乎具有大部分功能,当然,最重要的部分除外:播放流。它似乎正在从一个电话发送流,但是第二个电话无法播放该流。
这是比赛侧的代码
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)
有人对此有解决办法吗?提前致谢!
解决方法
我找到了一个开源项目来实现我的尝试。它通过IP摄像机处理带有元数据的视频。尽管它不直接将视频发送到电话,但它可以广播视频以供各种设备观看。可以在以下项目页面http://code.google.com/p/ipcamera-for-android/中找到源代码。
使用Android 4.4,还有另一种播放实时MJPEG流的方法。您正在播放的流应由其他设备通过UDP在端口上广播。假设我们有一个流在192.168.0.101:8080上广播。我们可以通过将WebView添加到布局中来播放流。然后在我们的活动中,执行以下操作:
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mjpeg_activity);
// Grab instance of WebView
WebView webView = (WebView)findViewById(R.id.webViewStream);
// Set page content for webview
webView.loadData(\"<html><head><meta name=\'viewport\' content=\'target-densitydpi=device-dpi,initial-scale=1,minimum-scale=1,user-scalable=yes\'/></head><body><center><img src=\\\"http://192.168.0.101:8080/\\\" alt=\\\"Stream\\\" align=\\\"middle\\\"></center></body></html>\",\"text/html\",null);
webView.getSettings().setBuiltInZoomControls(true);
}
在内容中,我们告诉网页使用设备的dpi。为了支持用户放大网页,我添加了以下初始比例= 1,最小比例= 1,用户可缩放=是。最初,图片是原始尺寸,无法缩小。用户现在可以缩放以放大图像并缩小到其原始大小。删除最小比例尺将使用户能够完全控制缩放,但可能导致图像变得如此之小以至于找不到它。
,您必须设置记录器输出格式8(MPEG-2TS,仅适用于Android 3.0+版本)。
在这种情况下,请以这种格式录制视频,并将视频流发送到其他手机,然后将其保存在文件中。在将一些数据写入文件后播放它,然后您就可以看到实时流。
注意-您无法直接浏览套接字文件描述符,因为无法找到套接字fd。如果您使用套接字fd,则会得到“偏移错误”。可以录制,但是播放受到限制。
,看一下流向Android MediaPlayer的内容,其中可能有一些有关如何进行流传输的有用提示。我怀疑问题是Android试图在该文件中查找,但由于它是网络套接字-不能。也许某种支持查找的磁盘/内存缓冲区可能会有所帮助?
,从以下位置下载源代码:http://code.google.com/p/ipcamera-for-android/
(https://github.com/Teaonly/android-eye)
首先构建jni(与cygwin一起使用ndk-build)
我可以成功建立这个专案