在带有 libstreaming 的 Nexus 5 上进行 USB 调试时获得ERROR_CAMERA_ALREADY

Question

我正在尝试使用libstream库来流式传输我的手机摄像头输出。我基于示例 3 构建了我的应用程序。但是，当我使用Nexus 5（使用Android 6.0.1）进行USB调试时，我只是不断收到这个ERROR_CAMERA_ALREADY_IN_USE异常。我尝试杀死其他应用程序，重新启动手机，但例外仍然存在。我在网上检查并看到了这个，但它没有给我正确的答案。所以我正在尝试寻求帮助，我很感激任何回复。这是我的主要活动：

import android.app.Activity;
import android.content.SharedPreferences;
import android.hardware.Camera;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.Window;
import android.view.WindowManager;
import net.majorkernelpanic.streaming.Session;
import net.majorkernelpanic.streaming.SessionBuilder;
import net.majorkernelpanic.streaming.audio.AudioQuality;
import net.majorkernelpanic.streaming.gl.SurfaceView;
import net.majorkernelpanic.streaming.rtsp.RtspClient;
import net.majorkernelpanic.streaming.video.VideoQuality;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MainActivity extends Activity implements
        RtspClient.Callback,
        Session.Callback,
        SurfaceHolder.Callback{
    public final static String TAG = "MainActivity";
    private SurfaceView mSurfaceView;
    private Session mSession;
    private RtspClient mClient;
    private final static String mURI = "rtsp://wowzaipaddress:1935/live/test.stream";
    private final static String mUsername = "";
    private final static String mPassword = "";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);
        Log.d(TAG, "onCreate()");
        mSurfaceView = (SurfaceView) findViewById(R.id.surface);
        mSession = SessionBuilder.getInstance()
                .setContext(getApplicationContext())
                .setAudioEncoder(SessionBuilder.AUDIO_AAC)
                .setAudioQuality(new AudioQuality(8000, 16000))
                .setVideoEncoder(SessionBuilder.VIDEO_H264)
                .setSurfaceView(mSurfaceView)
                .setPreviewOrientation(0)
                .setCallback(this)
                .setCamera(Camera.CameraInfo.CAMERA_FACING_BACK) //CAMERA_FACING_FRONT
                .build();
        // Configures the RTSP client
        mClient = new RtspClient();
        mClient.setSession(mSession);
        mClient.setCallback(this);
        mSurfaceView.getHolder().addCallback(this);
    }
    @Override
    protected void onDestroy(){
        super.onDestroy();
        mClient.release();
        mSession.release();
        mSurfaceView.getHolder().removeCallback(this);
    }
    @Override
    public void onRtspUpdate(int message, Exception exception) {
        switch (message) {
            case RtspClient.ERROR_CONNECTION_FAILED:
                Log.d(TAG, "Error (ERROR_CONNECTION_FAILED) : " + exception.getMessage());
                break;
            case RtspClient.ERROR_WRONG_CREDENTIALS:
                Log.d(TAG, "Error (ERROR_WRONG_CREDENTIALS) : " + exception.getMessage());
                break;
        }
        exception.printStackTrace();
    }
    /**
     *
     * Session.Callback
     * @param bitrate
     */
    @Override
    public void onBitrateUpdate(long bitrate) {
        Log.d(TAG, "onBitrateUpdate: bit rate change to " + bitrate / 1000 + " kbps");
    }
    @Override
    public void onPreviewStarted() {}
    @Override
    public void onSessionConfigured() {
        mSession.start();
    }
    @Override
    public void onSessionStarted() {
    }
    @Override
    public void onSessionStopped() {}
    @Override
    public void onSessionError(int reason, int streamType, Exception exception) {
        String errorTypeString = "";
        switch (reason) {
            case Session.ERROR_CAMERA_ALREADY_IN_USE:
                errorTypeString = "ERROR_CAMERA_ALREADY_IN_USE";
                break;
            case Session.ERROR_CAMERA_HAS_NO_FLASH:
                errorTypeString = "ERROR_CAMERA_HAS_NO_FLASH";
                break;
            case Session.ERROR_INVALID_SURFACE:
                errorTypeString = "ERROR_INVALID_SURFACE";
                break;
            case Session.ERROR_STORAGE_NOT_READY:
                errorTypeString = "ERROR_STORAGE_NOT_READY";
                break;
            case Session.ERROR_CONFIGURATION_NOT_SUPPORTED:
                VideoQuality quality = mSession.getVideoTrack().getVideoQuality();
                errorTypeString = "ERROR_CONFIGURATION_NOT_SUPPORTED: quality.toString()";
                return;
            case Session.ERROR_OTHER:
                errorTypeString = "ERROR_OTHER";
                break;
        }
        Log.d(TAG, "onSessionError: reason " + errorTypeString);
        if (null != exception) {
            Log.d(TAG, exception.getMessage());
            exception.printStackTrace();
        }
    }
    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        mSession.startPreview();
    }
    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {}
    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        mClient.stopStream();
        mSession.stop();
    }
    public void toggleStream() {
        if (!mClient.isStreaming()) {
            String ip,port,path;
            // We save the content user inputs in Shared Preferences
            SharedPreferences mPrefs = PreferenceManager.getDefaultSharedPreferences(MainActivity.this);
            SharedPreferences.Editor editor = mPrefs.edit();
            editor.putString("uri", mURI);
            editor.putString("password", mPassword);
            editor.putString("username", mUsername);
            editor.commit();
            // We parse the URI written in the Editext
            Pattern uri = Pattern.compile("rtsp://(.+):(\d*)/(.+)");
            Matcher m = uri.matcher(mURI); m.find();
            ip = m.group(1);
            port = m.group(2);
            path = m.group(3);
            Log.d(TAG, String.format("Configure client: ip: {0}, port: {1}, path: {2}",
                    ip, port, path));
            mClient.setCredentials(mUsername, mPassword);
            mClient.setServerAddress(ip, Integer.parseInt(port));
            mClient.setStreamPath("/"+path);
            mClient.startStream();
        } else {
            // Stops the stream and disconnects from the RTSP server
            mClient.stopStream();
        }
    }
}

这是我的安卓清单.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="XXXXX">
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.RECORD_AUDIO" />
    <uses-permission android:name="android.permission.CAMERA" />
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:theme="@style/AppTheme.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

这是我得到的错误：

03-17 23:44:25.308 2798-2798/? I/art: Late-enabling -Xcheck:jni
03-17 23:44:25.371 2798-2798/sharedcameralibstreaming W/System: ClassLoader referenced unknown path: /data/app/sharedcameralibstreaming-1/lib/arm
03-17 23:44:25.389 2798-2798/sharedcameralibstreaming D/MainActivity: onCreate()
03-17 23:44:25.392 2798-2798/sharedcameralibstreaming I/MediaStream: Phone supports the MediaCoded API
03-17 23:44:25.392 2798-2798/sharedcameralibstreaming D/AACStream: AAC supported on this phone
03-17 23:44:25.405 2798-2823/sharedcameralibstreaming D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true
03-17 23:44:25.436 2798-2823/sharedcameralibstreaming I/Adreno-EGL: <qeglDrvAPI_eglInitialize:379>: QUALCOMM Build: 10/21/15, 369a2ea, I96aee987eb
03-17 23:44:25.439 2798-2823/sharedcameralibstreaming I/OpenGLRenderer: Initialized EGL, version 1.4
03-17 23:44:25.457 2798-2798/sharedcameralibstreaming D/VideoStream: Surface Changed !
03-17 23:44:25.463 2798-2827/sharedcameralibstreaming W/CameraBase: An error occurred while connecting to camera: 0
03-17 23:44:25.491 2798-2798/sharedcameralibstreaming D/MainActivity: onSessionError: reason ERROR_CAMERA_ALREADY_IN_USE
03-17 23:44:25.491 2798-2798/sharedcameralibstreaming D/MainActivity: Fail to connect to camera service
03-17 23:44:25.491 2798-2798/sharedcameralibstreaming W/System.err: net.majorkernelpanic.streaming.exceptions.CameraInUseException: Fail to connect to camera service
03-17 23:44:25.491 2798-2798/sharedcameralibstreaming W/System.err:     at net.majorkernelpanic.streaming.video.VideoStream.openCamera(VideoStream.java:565)
03-17 23:44:25.491 2798-2798/sharedcameralibstreaming W/System.err:     at net.majorkernelpanic.streaming.video.VideoStream.createCamera(VideoStream.java:575)
03-17 23:44:25.492 2798-2798/sharedcameralibstreaming W/System.err:     at net.majorkernelpanic.streaming.video.VideoStream.startPreview(VideoStream.java:314)
03-17 23:44:25.492 2798-2798/sharedcameralibstreaming W/System.err:     at net.majorkernelpanic.streaming.Session$5.run(Session.java:551)
03-17 23:44:25.492 2798-2798/sharedcameralibstreaming W/System.err:     at android.os.Handler.handleCallback(Handler.java:739)
03-17 23:44:25.492 2798-2798/sharedcameralibstreaming W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:95)
03-17 23:44:25.492 2798-2798/sharedcameralibstreaming W/System.err:     at android.os.Looper.loop(Looper.java:148)
03-17 23:44:25.492 2798-2798/sharedcameralibstreaming W/System.err:     at android.os.HandlerThread.run(HandlerThread.java:61)

Answer 1

我遇到了同样的问题，当您安装到设备的第一个版本没有相机、音频等权限时，就会发生这种情况。仅将它们添加到清单，然后重新部署到手机，不会自动授予这些权限。诀窍是打开设置，转到应用程序设置，找到您的应用程序，然后手动启用相机，音频等的权限。从那时起，您的代码应该可以工作。