java - 相机错误 1001

Question

在过去的几天里，我一直在尝试解决这个错误，但没有运气。我正在尝试构建一个应用程序来记录我的 RTP 传输的视频文件以发送到服务器。LOGCAT 不提供任何其他消息

Camera Error 1001并且消息不断重复，直到我停止应用程序。相机初始化并且准备运行正常。调用 MediaRecorder.start() 时会引发错误。

这是录像机类的代码。

MediaRecorder mMediaRec;
Camera mCamera;
Button startRecording = null;
SurfaceView mSurfaceView;
SurfaceHolder mSurfaceHolder;
//CameraPreview mPreview;
boolean isRecording = false;
public static Socket sock;
public Uri filePath;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_media_streamer);
    // Show the Up button in the action bar.
    setupActionBar();
    //addListenerOnButton();

    Log.d(" Streamer On create", "Initializing camera");
    initialize();
    //startRecording();

}

/**
 * Set up the {@link android.app.ActionBar}, if the API is available.
 */
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
private void setupActionBar() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
        getActionBar().setDisplayHomeAsUpEnabled(true);
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.media_streamer, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case android.R.id.home:
        // This ID represents the Home or Up button. In the case of this
        // activity, the Up button is shown. Use NavUtils to allow users
        // to navigate up one level in the application structure. For
        // more details, see the Navigation pattern on Android Design:
        //
        // http://developer.android.com/design/patterns/navigation.html#up-vs-back
        //
        NavUtils.navigateUpFromSameTask(this);
        return true;
    }
    return super.onOptionsItemSelected(item);
}

public void initialize()
{

    startRecording = (Button)findViewById(R.id.button_start);
    mCamera = Camera.open();

    Log.d("Initialization", "Camera opened");
    mSurfaceView = (SurfaceView)findViewById(R.id.survace_camera);
    mSurfaceHolder = mSurfaceView.getHolder();
    mSurfaceHolder.addCallback(this);
    //setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
    //mSurfaceHolder.setType(SurfaceHholder.SURFACE_TYPE_PUSH_BUFFERS);
    Log.d("Streamer init", "Camera Initialized");
}

protected void startRecording()
{
    //Socket sock = new Socket();

        Log.d("Start recording method","Attempting to start recording");

        try
        {
            mMediaRec = new MediaRecorder();

            mMediaRec.setPreviewDisplay(mSurfaceHolder.getSurface());

            mCamera.unlock();
            mMediaRec.setCamera(mCamera);
            mMediaRec.setVideoSource(MediaRecorder.VideoSource.CAMERA);
            mMediaRec.setAudioSource(MediaRecorder.AudioSource.MIC);
            mMediaRec.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
            mMediaRec.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
            mMediaRec.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);

            filePath = getOutputMediaFileUri();
            mMediaRec.setOutputFile(filePath.getPath());

            mMediaRec.setMaxFileSize(50000);
            Thread.sleep(2000);
            //mMediaRec.set
            //mCamera.unlock();
            mMediaRec.prepare();
            Log.d("Start recording", "Recorder params set");
            Thread.sleep(2000);
            mMediaRec.start();
            isRecording = true;

} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}
        //StreamerBGManager bg = new StreamerBGManager();
        //bg.doInBackground(new String[]{});
catch (InterruptedException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}
catch(IllegalStateException e)
{
e.printStackTrace();
releaseMediaRecorder();
releaseCamera();
}

}

protected void stopRecording()
{
    mMediaRec.stop();
    mMediaRec.release();
    mCamera.release();
    releaseMediaRecorder();
    releaseCamera();
    isRecording = false;
}

private void releaseMediaRecorder()
{
    if(mMediaRec != null)
    {
        mMediaRec.reset();
        mMediaRec.release();
        mMediaRec = null;
        mCamera.lock();
        isRecording = false;
    }
}

private void releaseCamera()
{
    if (mCamera != null){
        mCamera.release();        // release the camera for other applications
        mCamera = null;
        isRecording = false;
    }
}

public void toggleRecord(View view)
{
    if(isRecording)
        stopRecording();
    else
        startRecording();
}

/*public void addListenerOnButton()
{

    startRecording.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            if(isRecording)
                stopRecording();
            else
                startRecording();

        }
    });
}*/

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
        int height) {
}

@Override
public void surfaceCreated(SurfaceHolder holder) {
    if (mCamera != null){
      Parameters params = mCamera.getParameters();

      mCamera.setParameters(params);
        try {
            mCamera.setPreviewDisplay(mSurfaceHolder);
            mCamera.startPreview();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    else {
        Toast.makeText(getApplicationContext(), "Camera not available!",    Toast.LENGTH_LONG).show();
        finish();
    }
}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
    mCamera.stopPreview();
    mCamera.release();
    //mMediaRec.release();
}