如何修复使用LocalSocket时在"MediaRecorder.start()"上出现的"java.lang.IllegalStateException"错误

Question

我正在尝试开发一个圆形视频录制器，并且需要将录制的视频保存在缓冲区中，在特定时刻恢复最后X分钟的内容。问题是当我运行MediaRecorder对象的'start（）'方法时：

mMediaRecorder.start();

以下错误出现：

java.lang.IllegalStateException android.media.MediaRecorder.start(Native Method) at picture.wikinova.com.odc.CameraActivity$MediaPrepareTask.doInBackground(CameraActivity.java:298) at picture.wikinova.com.odc.CameraActivity$MediaPrepareTask.doInBackground(CameraActivity.java:289) at android.os.AsyncTask$2.call(AsyncTask.java:333) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641) at java.lang.Thread.run(Thread.java:764)

当我使用'MediaRecorder'的'File'作为输出文件时，不会发生错误，但是当我尝试使用LocalSocket从内存中恢复视频缓冲区时，就会发生此错误。

这是我创建LocalServerSocket并捕获视频的代码。

         mLocalServerSocket = new LocalServerSocket("sockt_ip");
            } catch (Exception e) {
                e.printStackTrace();
            }
            LocalSocket mLocalClientSocket = null;
            mLocalClientSocket = mLocalServerSocket.accept();
            InputStream in = mLocalClientSocket.getInputStream();
            byte[] buffer = new byte[1024];
            String retorno = "";
            int len = 0;
            while ((len = in.read(buffer)) >= 0) {
                for (int i = 0; i < len; i++) {
                  retorno += buffer[i];
                }

             }

这是我的代码来创建 MediaRecorder 并设置输出文件

CamcorderProfile profile = CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH);
        profile.videoFrameWidth = optimalSize.width;
        profile.videoFrameHeight = optimalSize.height;

        parameters.setPreviewSize(profile.videoFrameWidth, profile.videoFrameHeight);
        mCamera.setParameters(parameters);
        try {
            mCamera.setPreviewTexture(mPreview.getSurfaceTexture());
        } catch (IOException e) {
            Log.e(TAG, "Surface texture is unavailable or unsuitable" + e.getMessage());
            return false;
        }


        mMediaRecorder = new MediaRecorder();

        mCamera.unlock();
        mMediaRecorder.setCamera(mCamera);


        mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
        mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);



        mMediaRecorder.setProfile(profile);

        LocalSocket outSocket = new LocalSocket();
        try {
            outSocket.connect(new LocalSocketAddress("sockt_ip"));
        } catch (Exception e) {
            e.printStackTrace();
        }
        mMediaRecorder.setOutputFile(outSocket.getFileDescriptor());


        mMediaRecorder.prepare();
        mMediaRecorder.start();

我已经测试了套接字连接。我在其中写入了一些文本。

LocalSocket outSocket 

并已收到

InputStream in = mLocalClientSocket.getInputStream();
byte[] buffer = new byte[1024];

问题在于我将Socket文件描述符设置为媒体记录器的输出文件时，但我无法弄清楚问题所在。

- Rafael

Answer 1

尝试使用new LocalSocket(LocalSocket.SOCKET_STREAM)创建您的LocalSocket，而不是new LocalSocket()。

如果您不像上面所示设置套接字类型，则实际系统套接字LocalSocketImpl会精确地抱怨IllegalStateException，这是该类中唯一的一个：

public void create (int sockType) throws IOException {
    // no error if socket already created
    // need this for LocalServerSocket.accept()
    if (fd == null) {
        int osType;
        switch (sockType) {
            case LocalSocket.SOCKET_DGRAM:
                osType = OsConstants.SOCK_DGRAM;
                break;
            case LocalSocket.SOCKET_STREAM:
                osType = OsConstants.SOCK_STREAM;
                break;
            case LocalSocket.SOCKET_SEQPACKET:
                osType = OsConstants.SOCK_SEQPACKET;
                break;
            default:
                throw new IllegalStateException("unknown sockType");
        }
        try {
            fd = Os.socket(OsConstants.AF_UNIX, osType, 0);
            mFdCreatedInternally = true;
        } catch (ErrnoException e) {
            e.rethrowAsIOException();
        }
    }
}

应该选择 SOCKET_STREAM 的原因是，LocalServerSocket 内部的 LocalSocketImpl 也使用了这种类型。

- Leo supports Monica Cellio

Answer 2

请使用以下代码。

    CamcorderProfile profile = CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH);
            profile.videoFrameWidth = optimalSize.width;
            profile.videoFrameHeight = optimalSize.height;

            parameters.setPreviewSize(profile.videoFrameWidth, profile.videoFrameHeight);
            mCamera.setParameters(parameters);
            try {
                mCamera.setPreviewTexture(mPreview.getSurfaceTexture());
            } catch (IOException e) {
                Log.e(TAG, "Surface texture is unavailable or unsuitable" + e.getMessage());
                return false;
            }


            mMediaRecorder = new MediaRecorder();

            mCamera.unlock();
            mMediaRecorder.setCamera(mCamera);


            mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
            mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);



            mMediaRecorder.setProfile(profile);

            LocalSocket outSocket = new LocalSocket(LocalSocket.SOCKET_STREAM);
            try {
                outSocket.connect(new LocalSocketAddress("sockt_ip"));
            } catch (Exception e) {
                e.printStackTrace();
            }
            mMediaRecorder.setOutputFile(outSocket.getFileDescriptor());


            mMediaRecorder.prepare();
            mMediaRecorder.start();

- Akash