我正在创建一个应用程序，我想流式传输foscam实时供稿。我对编码还很陌生，其中一些代码已经使我望而却步。我找到了一些帮助，可以使您走得更远，但现在遇到了麻烦。该应用程序运行，但仅显示黑屏。我相信我的清单和XML代码都正确。问题出在我的代码中。我希望有人可以帮助我
package com.rednak.camerastream;
import android.app.Activity;
import android.content.Context;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.util.Base64;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.Window;
import android.view.WindowManager;
import java.util.HashMap;
import java.util.Map;
public class MainActivity extends Activity
implements MediaPlayer.OnPreparedListener,
SurfaceHolder.Callback {
final static String USERNAME = "guest";
final static String PASSWORD = "Guest";
final static String RTSP_URL = "rtsp://http://rednak71.ddns.net:8090/live1.sdp";
private MediaPlayer _mediaPlayer;
private SurfaceHolder _surfaceHolder;
@
Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Set up a full-screen black window.
requestWindowFeature(Window.FEATURE_NO_TITLE);
Window window = getWindow();
window.setFlags(
WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
window.setBackgroundDrawableResource(android.R.color.black);
setContentView(R.layout.activity_main);
// Configure the view that renders live video.
SurfaceView surfaceView =
(SurfaceView) findViewById(R.id.surfaceView);
_surfaceHolder = surfaceView.getHolder();
_surfaceHolder.addCallback(this);
_surfaceHolder.setFixedSize(320, 240);
}
// More to come…
/*
SurfaceHolder.Callback
*/
@
Override
public void surfaceChanged(
SurfaceHolder sh, int f, int w, int h) {}
@
Override
public void surfaceCreated(SurfaceHolder sh) {
_mediaPlayer = new MediaPlayer();
_mediaPlayer.setDisplay(_surfaceHolder);
Context context = getApplicationContext();
Map headers = getRtspHeaders();
Uri source = Uri.parse(RTSP_URL);
try {
// Specify the IP camera’s URL and auth headers.
_mediaPlayer.setDataSource(context, source, headers);
// Begin the process of setting up a video stream.
_mediaPlayer.setOnPreparedListener(this);
_mediaPlayer.prepareAsync();
} catch (Exception e) {}
}
@
Override
public void surfaceDestroyed(SurfaceHolder sh) {
_mediaPlayer.release();
}
private Map getRtspHeaders() {
Map headers = new HashMap();
String basicAuthValue = getBasicAuthValue(USERNAME, PASSWORD);
headers.put("Authorization", basicAuthValue);
return headers;
}
private String getBasicAuthValue(String usr, String pwd) {
String credentials = usr + ":" + pwd;
int flags = Base64.URL_SAFE | Base64.NO_WRAP;
byte[] bytes = credentials.getBytes();
return "Basic" + Base64.encodeToString(bytes, flags);
}
/*
MediaPlayer.OnPreparedListener
*/
@
Override
public void onPrepared(MediaPlayer mp) {
_mediaPlayer.start();
}
}确保Android的MediaPlayer实际上可以打开并解码您的流。现在，如果MediaPlayer无法处理您的流，则说明您正在捕获任何异常并无视其忽略：
try {
// Specify the IP camera’s URL and auth headers.
_mediaPlayer.setDataSource(context, source, headers);
// Begin the process of setting up a video stream.
_mediaPlayer.setOnPreparedListener(this);
_mediaPlayer.prepareAsync();
} catch (Exception e) {}
至少您应该记录该错误：
} catch (Exception e) {
Log.e("MyApp", "Could not open data source", e);
}
尽管MediaPlayer服务很可能会在日志中显示自己的错误。因此，您应该做的是查看logcat中是否有来自“ VideoDecoder”或类似内容的任何消息。
要在Android Studio中查看logcat，请打开默认情况下位于底部的“ Android Monitor”选项卡。如果要查看未过滤的logcat，请确保在Android Monitor视图的右上角显示“无过滤器”，而不是“仅显示选定的应用程序”。
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我来说两句