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对于我的集成测试，我正在开发一个需要向本地托管网站提供实时流的应用程序。我已经建立了一个运行在 nanohttpd 上的工作站点。此应用程序还执行特殊的图像处理。因此我使用JavaCV。该库运行良好，所有 cpp 绑定也正常运行。

我的问题：如何设置可以直接在 nanohttpd 托管的静态站点中播放的直播流？- 我走对了吗？

我的代码：

在里面：

private void initLiveStream() throws FrameRecorder.Exception {
    /* ~~~ https://github.com/bytedeco/javacv/issues/598 ~~~ */
    frameRecorder = new FFmpegFrameRecorder("http://localhost:9090", imageWidth, imageHeight, 0);
    frameRecorder.setVideoOption("preset", "ultrafast");
    frameRecorder.setVideoCodec(avcodec.AV_CODEC_ID_H264);
    frameRecorder.setAudioCodec(0);
    frameRecorder.setPixelFormat(avutil.AV_PIX_FMT_YUV420P);
    frameRecorder.setFormat("webm");
    frameRecorder.setGopSize(10);
    frameRecorder.setFrameRate(frameRate);
    frameRecorder.setVideoBitrate(5000);
    frameRecorder.setOption("content_type","video/webm");
    frameRecorder.setOption("listen", "1");
    frameRecorder.start();
}

在我的 CameraView 中：

@Override
public void onPreviewFrame(byte[] data, Camera camera) {
    Camera.Size size = camera.getParameters().getPreviewSize();
    Frame frame = new AndroidFrameConverter().convert(data, size.width, size.height);
    try {
         if(frameRecorder!=null){
             frameRecorder.record(frame);
         }
     } catch (FrameRecorder.Exception e) {
         e.printStackTrace();
     }
 }

这是我搜索解决方案时经常显示的堆栈跟踪之一：

org.bytedeco.javacv.FrameRecorder$Exception: avio_open error() error -111: Could not open 'http://localhost:9090'

我找不到任何其他线程来解决这个特定问题。

提前致谢

编辑

感谢 Chester Cobus，这是我使用的代码：

网络套接字：

//Constructor
AsyncHttpServer serverStream = new AsyncHttpServer();
List<WebSocket> sockets = new ArrayList<>();

//http://stackoverflow.com/a/33021907/5500092
//I'm planning to use more sockets. This is the only uniform expression I found.
serverStream.websocket("/((?:[^/]*/)*)(.*)", new AsyncHttpServer.WebSocketRequestCallback() {
     @Override
     public void onConnected(final WebSocket webSocket, AsyncHttpServerRequest request) {
         String uri = request.getPath();
         if (uri.equals("/live")) {
             sockets.add(webSocket);

             //Use this to clean up any references to your websocket
             webSocket.setClosedCallback(new CompletedCallback() {
                 @Override
                 public void onCompleted(Exception ex) {
                     try {
                         if (ex != null)
                             Log.e("WebSocket", "Error");
                     } finally {
                         sockets.remove(webSocket);
                     }
                 }
             });
         }
     }
});

//Updater (Observer pattern)
@Override
public void updated(byte[] data) {
    for (WebSocket socket : sockets) {
         socket.write(new ByteBufferList(data));
    }
}

记录活动

private long start_time = System.currentTimeMillis();

@Override
public void onPreviewFrame(byte[] data, Camera camera) {
    long now_time = System.currentTimeMillis();
    if ((now_time - start_time) > 250) {
        start_time = now_time;
        //https://forums.xamarin.com/discussion/40991/onpreviewframe-issue-converting-preview-byte-to-android-graphics-bitmap
        Camera.Size size = camera.getParameters().getPreviewSize();
        YuvImage image = new YuvImage(data, ImageFormat.NV21, size.width, size.height, null);
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        image.compressToJpeg(new Rect(0, 0, size.width, size.height), 60, byteArrayOutputStream);
        MainActivity.getWebStreamer().updated(byteArrayOutputStream.toByteArray());
    }
}

JavaScript

var socket;
var imageElement;

/**
 * path - String.Format("ws://{0}:8090/live", Window.Location.HostName)
 * image - HTMLImageElement
 */
function imageStreamer(path, image) {
    imageElement = image;
    socket = new WebSocket(path);

    socket.onmessage = function(msg) {
        var arrayBuffer = msg.data;
        var reader = new FileReader();
        reader.onload = function(e) {
            imageElement.src = e.target.result;
        };
        reader.readAsDataURL(arrayBuffer);
    };
}
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1 回答 1

1

以下是 Web 套接字实现的示例：

 //This code must run just before Camera is opened.    

 AsyncHttpServer server = new AsyncHttpServer();

  server.websocket("/live","ws", new WebSocketRequestCallback() {
            @Override
            public void onConnected(final WebSocket webSocket, AsyncHttpServerRequest request) {
                this.webSocket = webSocket //webSocket make it an instance variable
            }
  });

 //listen on port 5000
 server.listen(5000);
 //browsing ws://{IP Address assigned by wifi}:5000/live

@Override
public void onPreviewFrame(byte[] data, Camera camera) {
   this.websocket.send(data);
}

使用 Gradle 获取上面的库

dependencies {
    compile 'com.koushikdutta.async:androidasync:2.+'
}

这是您网站的客户端代码：

  var socket = new WebSocket('ws://{IP Address assigned by wifi}:5000/live', ['soap', 'xmpp']);

  socket.onmessage = function(msg) {
      var arrayBuffer = msg.data;
      var image = document.getElementById('image'); //<img id="image" /> in HTML

      var reader = new FileReader();
      reader.onload = function(e) {
           image.src = e.target.result;
      };
      reader.readAsDataURL(arrayBuffer);
  };
于 2017-03-24T22:43:53.370 回答