我找不到任何包来流式传输用户正在使用 React Native 从应用程序中执行的操作。

我正在创建自己的插件

目标是将流从 java 发送到 javascript，然后通过 socket.io 将其发送到外部套接字服务器

这是我的java类请求授权和流

import android.hardware.display.DisplayManager;
import android.util.DisplayMetrics;
import android.app.Activity;
import android.content.Intent;
import android.media.projection.MediaProjectionManager;
import android.media.projection.MediaProjection;
import android.media.MediaRecorder;
import android.util.Log;

import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;
import com.facebook.react.bridge.Promise;
import com.facebook.react.bridge.ActivityEventListener;
import com.facebook.react.bridge.BaseActivityEventListener;

import static android.content.Context.MEDIA_PROJECTION_SERVICE;

public class ScreenMirroringModule extends ReactContextBaseJavaModule {

    private static final int SCREEN_SHARE_REQUEST = 4242;
    private static final String S_MIRROR_CANCELLED = "S_MIRROR_CANCELLED";


    private Promise sMirrorPromise;
    private MediaProjectionManager mMediaProjectionManager;
    private MediaStreamer mMediaStreamer = new MediaStreamer();

    private final ActivityEventListener mActivityEventListener = new BaseActivityEventListener() {
        @Override
        public void onActivityResult(Activity activity, int requestCode, int resultCode, Intent intent) {
            if (requestCode == SCREEN_SHARE_REQUEST) {
                if (sMirrorPromise != null) {
                    if (resultCode == Activity.RESULT_CANCELED) {
                        sMirrorPromise.reject(S_MIRROR_CANCELLED, "Screen mirroring was cancelled");
                    } else if (resultCode == Activity.RESULT_OK) {

                        DisplayMetrics dm = new DisplayMetrics();
                        activity.getWindowManager().getDefaultDisplay().getMetrics(dm);

                        mMediaStreamer.reset();

                        mMediaStreamer.setVideoSource(MediaRecorder.VideoSource.SURFACE);
                        mMediaStreamer.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
                        mMediaStreamer.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
                        mMediaStreamer.setVideoSize(dm.widthPixels, dm.heightPixels);
                        mMediaStreamer.setVideoFrameRate(30);

                        StreamTask st =  new StreamTask();
                        st.execute(mMediaStreamer);
                        try {
                            st.get();
                        } catch (Exception e) {
                            sMirrorPromise.reject(e);
                        }

                        MediaProjection mMediaProjection = mMediaProjectionManager.getMediaProjection(resultCode, intent);

                        try {
                            mMediaProjection.createVirtualDisplay("MainActivity",
                                    dm.widthPixels, dm.heightPixels, dm.densityDpi,
                                    DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,
                                    mMediaStreamer.getSurface(), null /*Callbacks*/, null/*Handler*/);
                            mMediaStreamer.start();
                        } catch (Exception e) {
                            //Log.v("ReactNative", Log.getStackTraceString(e));
                            sMirrorPromise.reject(e);
                        }

                        sMirrorPromise.resolve("Test");

                    }

                }
                sMirrorPromise = null;
            }
        }
    };

    public ScreenMirroringModule(ReactApplicationContext reactContext) {
        super(reactContext);

        // Add the listener for `onActivityResult`
        reactContext.addActivityEventListener(mActivityEventListener);
    }

    @Override
    public String getName() {
        return "ScreenMirroring";
    }

    @ReactMethod
    public void stream(String ip, int port, Promise promise) {
        final Activity activity = getCurrentActivity();

        // Store the promise to resolve/reject when picker returns data
        sMirrorPromise = promise;

        mMediaProjectionManager = (MediaProjectionManager) activity.getSystemService(MEDIA_PROJECTION_SERVICE);
        Intent intent = mMediaProjectionManager.createScreenCaptureIntent();
        activity.startActivityForResult(intent, SCREEN_SHARE_REQUEST);
    }
}

这是我的类(class)，正在将录音转换为流

package com.ijkoareactapp;

import android.media.MediaRecorder;
import android.net.LocalServerSocket;
import android.net.LocalSocket;
import android.net.LocalSocketAddress;
import android.util.Log;

import java.io.IOException;
import java.io.InputStream;

public class MediaStreamer extends MediaRecorder {
    private LocalServerSocket localServerSocket = null;
    private LocalSocket receiver, sender = null;

    public void prepare() throws IllegalStateException, IOException {

        receiver = new LocalSocket();
        try {
            localServerSocket = new LocalServerSocket("screen_mirror_socket");
            receiver.connect(new LocalSocketAddress("screen_mirror_socket"));
            receiver.setReceiveBufferSize(4096);
            receiver.setSendBufferSize(4096);
            sender = localServerSocket.accept();
            sender.setReceiveBufferSize(4096);
            sender.setSendBufferSize(4096);
        } catch (Exception e) {
            throw new IOException("Can't create local socket !");
        }


        setOutputFile(sender.getFileDescriptor());

        try {
            super.prepare();
        } catch (Exception e) {
            Log.v("ReactNative", Log.getStackTraceString(e));

            closeSockets();
            throw e;
        }
    }

    public InputStream getInputStream() {

        InputStream out = null;

        try {
            out = receiver.getInputStream();
        } catch (IOException e) {
        }

        return out;

    }


    public void stop() {
        closeSockets();
        super.stop();
    }

    private void closeSockets() {
        if (localServerSocket != null) {
            try {
                localServerSocket.close();
                sender.close();
                receiver.close();
            } catch (IOException e) {

            }
            localServerSocket = null;
            sender = null;
            receiver = null;
        }
    }
}

这是在后台运行任务的类，因为我无法在主进程中启动本地套接字

package com.ijkoareactapp;

import android.os.AsyncTask;
import android.util.Log;

public class StreamTask extends AsyncTask <MediaStreamer, Integer, Long>{

    protected Long doInBackground(MediaStreamer... mediaStreamers) {

        Log.v("ReactNative", "Start");

        for(int i = 0; i < mediaStreamers.length; i++) {
            try {
                mediaStreamers[i].prepare();
                Log.v("ReactNative", "Prepared");
            } catch (Exception e) {
                Log.v("ReactNative", "Error");
                Log.v("ReactNative", Log.getStackTraceString(e));
            }
        }

        return null;
    }
}

我的错误是

08-05 15:28:49.465   555   571 V ReactNative: java.lang.IllegalStateException
08-05 15:28:49.465   555   571 V ReactNative:   at android.media.MediaRecorder._prepare(Native Method)
08-05 15:28:49.465   555   571 V ReactNative:   at android.media.MediaRecorder.prepare(MediaRecorder.java:827)
08-05 15:28:49.465   555   571 V ReactNative:   at com.ijkoareactapp.MediaStreamer.prepare(MediaStreamer.java:37)
08-05 15:28:49.465   555   571 V ReactNative:   at com.ijkoareactapp.StreamTask.doInBackground(StreamTask.java:14)
08-05 15:28:49.465   555   571 V ReactNative:   at com.ijkoareactapp.StreamTask.doInBackground(StreamTask.java:6)
08-05 15:28:49.465   555   571 V ReactNative:   at android.os.AsyncTask$2.call(AsyncTask.java:304)
08-05 15:28:49.465   555   571 V ReactNative:   at java.util.concurrent.FutureTask.run(FutureTask.java:237)
08-05 15:28:49.465   555   571 V ReactNative:   at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
08-05 15:28:49.465   555   571 V ReactNative:   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
08-05 15:28:49.465   555   571 V ReactNative:   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
08-05 15:28:49.465   555   571 V ReactNative:   at java.lang.Thread.run(Thread.java:761)

阅读一些文档，似乎 prepare 在 start 之前或在 setOutputFormat 之后被调用，但事实并非如此。

我认为我的内部套接字连接没有很好地初始化，但我找不到正确的方法来完成它。

我也不确定我应该把 mMediaProjection.createVirtualDisplay 放在哪里，目前我有以下错误应该是因为 prepare 不工作

08-05 15:43:36.077  1575  1575 V ReactNative: java.lang.IllegalStateException: failed to get surface
08-05 15:43:36.077  1575  1575 V ReactNative:   at android.media.MediaRecorder.getSurface(Native Method)
08-05 15:43:36.077  1575  1575 V ReactNative:   at com.ijkoareactapp.ScreenMirroringModule$1.onActivityResult(ScreenMirroringModule.java:65)
08-05 15:43:36.077  1575  1575 V ReactNative:   at com.facebook.react.bridge.ReactContext.onActivityResult(ReactContext.java:262)
08-05 15:43:36.077  1575  1575 V ReactNative:   at com.facebook.react.ReactInstanceManager.onActivityResult(ReactInstanceManager.java:703)
08-05 15:43:36.077  1575  1575 V ReactNative:   at com.facebook.react.ReactActivityDelegate.onActivityResult(ReactActivityDelegate.java:124)
08-05 15:43:36.077  1575  1575 V ReactNative:   at com.facebook.react.ReactActivity.onActivityResult(ReactActivity.java:75)
08-05 15:43:36.077  1575  1575 V ReactNative:   at android.app.Activity.dispatchActivityResult(Activity.java:6915)
08-05 15:43:36.077  1575  1575 V ReactNative:   at android.app.ActivityThread.deliverResults(ActivityThread.java:4049)
08-05 15:43:36.077  1575  1575 V ReactNative:   at android.app.ActivityThread.handleSendResult(ActivityThread.java:4096)
08-05 15:43:36.077  1575  1575 V ReactNative:   at android.app.ActivityThread.-wrap20(ActivityThread.java)
08-05 15:43:36.077  1575  1575 V ReactNative:   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1516)
08-05 15:43:36.077  1575  1575 V ReactNative:   at android.os.Handler.dispatchMessage(Handler.java:102)
08-05 15:43:36.077  1575  1575 V ReactNative:   at android.os.Looper.loop(Looper.java:154)
08-05 15:43:36.077  1575  1575 V ReactNative:   at android.app.ActivityThread.main(ActivityThread.java:6077)
08-05 15:43:36.077  1575  1575 V ReactNative:   at java.lang.reflect.Method.invoke(Native Method)
08-05 15:43:36.077  1575  1575 V ReactNative:   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
08-05 15:43:36.077  1575  1575 V ReactNative:   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)

最佳答案

很难在本地重现您的问题。 您可能对 MediaStreamer 初始化的错误顺序是正确的。 尝试逐行遵循此顺序:

1. 设置视频源
2. 设置输出格式
3. 设置视频编码器
4. setPreviewDisplay(surfaceHolder.getSurface())
5. 设置输出文件
6. 准备
7. 开始

如果它没有帮助，我的最佳建议是 - 查看工作中的 React Native/Android 项目并尝试找出不同之处: https://github.com/ycswaves/react-native-screen-recorder/blob/master/android/app/src/main/java/com/screenrecorder/MainActivity.java#L131~L143 或这个: https://github.com/fyhertz/spydroid-ipcamera/blob/779f1035ac8fd91be5dfba99516da1b9f29f8768/src/net/majorkernelpanic/streaming/video/VideoStream.java#L339~L357

根据这个 repos OutputFormat.MPEG_4 不是套接字的最佳选择。你想试试 THREE_GPP 吗？

最后，您必须为您的应用添加额外的权限:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_SETTINGS" />

祝你好运!

关于java - 使用 MediaRecorder 流屏幕 react native ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/57361966/