使用 android studio 在应用程序中流式传输实时摄像头画面

Question

我正在创建一个应用程序，我想在其中传输我的 foscam 直播。我对编码还很陌生，其中一些代码让我头疼。我找到了一些帮助，但现在遇到了障碍。该应用程序运行但仅显示黑屏。我相信我的清单和 XML 代码都是正确的。问题出在我的代码上。希望有人能帮帮我

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();
    }
  }

Answer 1

确保 Android 的 MediaPlayer 确实可以打开和解码您的流。现在，如果 MediaPlayer 无法处理您的流，您将捕获任何异常并默默地忽略它：

  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) {}

至少你应该记录错误：

  } 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加入其自身的错误。所以你应该做的是查看 logcat 是否有来自 "VideoDecoder" 或类似的消息。

要在 Android Studio 中查看 logcat，请打开默认位于底部的 "Android Monitor" 选项卡。如果您想查看未过滤的 logcat，请确保在 Android 监视器视图的右上角显示 "No Filters" 而不是 "Show only selected application".

Answer 2

我有一些链接到 Foscam 视频流的新代码，但只在它开始时抓取帧然后不流式传输。我更近了，但仍然需要帮助。我走对了吗？

package com.rednak.camstream;

import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.VideoView;

public class MainCamActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_cam);

        VideoView vidView = (VideoView)findViewById(R.id.CamVideoView);

        String vidAddress = "http://rednak71.ddns.net:8090/CGIProxy.fcgi?       cmd=snapPicture2&usr=guest&pwd=guest&t=";
        Uri vidUri = Uri.parse(vidAddress);

        vidView.setVideoURI(vidUri);
        vidView.start();

    }
}

使用 android studio 在应用程序中流式传输实时摄像头画面

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