我是Android编程新手并且发现自己陷入困境我一直在研究各种方法来将实时视频从手机传输到手机,并且似乎主要是功能性的,当然除了最重要的部分: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。
以下是比赛侧的代码
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)
有人对此有解决方法吗?提前谢谢!
答案 0 :(得分:6)
我发现了一个用于实现我正在尝试的开源项目。它通过IP摄像头处理带有元数据的视频。虽然它不直接向手机发送视频,但它确实播放了各种设备的视频观看。源代码可以在以下项目页面http://code.google.com/p/ipcamera-for-android/中找到。
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在UDP端口上广播。假设我们在192.168.0.101:8080播放了一个流。我们可以通过在布局中添加WebView来播放流。然后在我们的活动中,我们执行以下操作:
@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。为了支持用户在网页上缩放缩放,我添加了以下initial-scale = 1,minimum-scale = 1,user-scalable = yes。最初图像是原始尺寸,不能变小。用户现在可以缩放以放大图像并缩小到原始大小。删除最小比例将使用户完全控制缩放,但可能导致图像变得如此之小,以至于无法找到它。
答案 1 :(得分:4)
您必须设置录像机输出格式8(MPEG-2TS,仅适用于Android 3.0及更高版本)。 在这种情况下,以此格式记录视频并将流发送到其他手机并将其保存在文件中。在文件中写入一些数据后播放它,然后你就可以看到实时流。
注意 - 您无法直接播放套接字文件描述符,因为套接字fd不可搜索。如果使用套接字fd,则会出现“偏移错误”。可以录制,但播放受到限制。
答案 2 :(得分:0)
查看Streaming to the Android MediaPlayer,其中可能有一些有关如何进行流媒体的有用提示。我怀疑问题是Android试图在文件中寻找,但作为网络套接字 - 它不能。也许某种支持搜索的磁盘/内存缓冲区有帮助吗?
答案 3 :(得分:0)
从以下网址下载源代码:http://code.google.com/p/ipcamera-for-android/ (https://github.com/Teaonly/android-eye)
首先构建jni(使用带有cygwin的ndk-build)
我可以成功构建这个项目