Question

我想做的是使用PI控制我制造的小型车辆。我想通过Web界面对此进行控制，还希望在驾驶时使用PI摄像机获取直播。

我正在通过以下模块在PI上使用nodejs：https://www.npmjs.com/package/raspivid-stream，以从PI摄像机获取流。这是我的nodejs代码：

var raspividStream = require('raspivid-stream');
var stream = raspividStream();

wss.on('connection', function connection(ws) {
  ws.on('message', function incoming(message) {
    console.log('received: %s', message);
  });

  stream.on('data', (data) => {
    ws.send(data, { binary: true }, (error) => { if (error) console.error(error); 
  });
});

，这里是index.html：

...htmlstuff...
<canvas id="stream"></canvas>
<script src="decoder.js"></script>
<script src="player.js"></script>
<script>
    var connection = new WebSocket('ws://raspberrypi:8443');
    var p = new Player();
    p.canvas = document.getElementById("stream"); // the canvas - p$
    connection.onopen = function () {
      connection.send('Ping'); // Send the message 'Ping' to $
    };

    connection.onerror = function (error) {
      console.log('WebSocket Error ' + error);
    };

    connection.onmessage = function (e) {
      console.log(e.data);
      p.decode(e);
    };
</script>
...htmlstuff...

到目前为止，我在浏览器控制台中遇到此错误：

wasm streaming compile failed: TypeError: Failed to execute 'compile' on 'WebAssembly': Incorrect response MIME type. Expected 'application/wasm'.
falling back to ArrayBuffer instantiation
failed to asynchronously prepare wasm: CompileError: AsyncCompile: Wasm decoding failed: expected magic word 00 61 73 6d, found 3c 21 44 4f @+0
CompileError: AsyncCompile: Wasm decoding failed: expected magic word 00 61 73 6d, found 3c 21 44 4f @+0
 Uncaught (in promise) abort({}). Build with -s ASSERTIONS=1 for more info.

有人知道如何解决这个问题吗？

Answer 1

最新版本的Broadway中有一个名为avc.wasm的静态文件资产。您需要让服务器以正确的MIME内容类型application/wasm交付它，以便解码器可以加载它。

或者您可以使用asm.js而不是WebAssembly尝试较旧版本的Broadway。是here。

在websocket上使用Broadway.js和raspi-camera的问题

1 个答案: