Babylon使用麥克風(fēng)并處理常見問題解決

更新時間：2023年04月03日 15:00:02 作者：方寸匠心

這篇文章主要為大家介紹了Babylon使用麥克風(fēng)并處理常見問題解決，有需要的朋友可以借鑒參考下，希望能夠有所幫助，祝大家多多進步，早日升職加薪

引言

在Babylon.js中媒體設(shè)備流使用起來有很多坑，我們將在本文中逐一說明這些坑并提供相應(yīng)的解決方案。

問題1：Property 'constraints' does not exist on type 'Window & typeof globalThis'.

在比較新的瀏覽器中，navigator對象中的getUserMedia方法已經(jīng)被廢棄了。取而代之的是navigator.mediaDevices.getUserMedia()，并且constraints應(yīng)該作為參數(shù)傳入。

const constraints = { audio: true, video: false };
navigator.mediaDevices.getUserMedia(constraints)

對于問題 Property 'constraints' does not exist on type 'Window & typeof globalThis'.ts(2339)。這是因為 TypeScript 沒有識別到constraints變量的類型，可以嘗試直接定義一個 const constraints 常量。

問題2： Property 'stream' does not exist on type 'Window & typeof globalThis'.ts(2339)

如果在使用媒體設(shè)備流時，你遇到了“Property 'stream' does not exist on type 'Window & typeof globalThis'.ts(2339)” 這個問題出現(xiàn)在TypeScript項目中。因為該類型Script不認識window.stream, 所以我們需要將它聲明為any類型。解決方法如下：

(window as any).stream = stream;

這讓編譯器知道 window 對象現(xiàn)在具有一個名為stream的屬性。

問題3： Property 'oninactive' does not exist on type 'MediaStream'.ts(2339)

在較新版本的Web API中，MediaStream對象不再包含oninactive屬性，需要更改事件監(jiān)聽方式。解決方法如下：

stream.addEventListener('inactive', () => {
    console.log('Stream ended ... ...');
});

而不是

stream.oninactive = () => {
    console.log('Stream ended ... ...');
};

此更改暴露了更多事件，同時也需要更改您的代碼來處理它們。

總結(jié)

在 Babylon.js 中，使用媒體設(shè)備流時出現(xiàn)的問題通常是由于您沒有根據(jù)最新的約定執(zhí)行操作，或者由于 TypeScript 編譯器不知道您所做的更改而導(dǎo)致的。通過遵循我們提供的指南和解決方案，您應(yīng)該能夠輕松地解決這些問題。

示例源碼(修改前)：

loadingASoundFromTheMicrophone = (scene: Scene, canvas: HTMLCanvasElement) => {
        let engine = scene.getEngine();
        let freeCamera = new FreeCamera("freeCamera", new Vector3(0, 5, -10), scene);
        freeCamera.setTarget(Vector3.Zero());
        freeCamera.attachControl(canvas, true);
        let hemisphericLight = new HemisphericLight("hemisphericLight", new Vector3(0, 1, 0), scene);
        hemisphericLight.intensity = 0.7;
        let sphere = MeshBuilder.CreateSphere("sphere", {segments: 16, diameter: 2}, scene);
        const constraints = window.constraints = { audio: true, video: false };
        function handleSuccess(stream: MediaStream) {
            const audioTracks = stream.getAudioTracks();
            console.log('Got stream with constraints:', constraints);
            console.log(`Using audio device: ${audioTracks[0].label}`);
            stream.oninactive = function() {
                console.log('Stream ended');
            };
            window.stream = stream; // make variable available to browser console
            var bjsSound = new Sound("mic", stream, scene);
            bjsSound.attachToMesh(sphere);
            bjsSound.play();
        }
        function handleError(error: any) {
            console.log('navigator.getUserMedia error: ', error);
        }
        navigator.mediaDevices.getUserMedia(constraints).then(handleSuccess).catch(handleError);
        return scene;
    }

示例源碼(修改后)：

loadingASoundFromTheMicrophone = (scene: Scene, canvas: HTMLCanvasElement) => {
        let engine = scene.getEngine();
        let freeCamera = new FreeCamera("freeCamera", new Vector3(0, 5, -10), scene);
        freeCamera.setTarget(Vector3.Zero());
        freeCamera.attachControl(canvas, true);
        let hemisphericLight = new HemisphericLight("hemisphericLight", new Vector3(0, 1, 0), scene);
        hemisphericLight.intensity = 0.7;
        let sphere = MeshBuilder.CreateSphere("sphere", {segments: 16, diameter: 2}, scene);
        const constraints = {  audio: true, video: false };
        function handleSuccess(stream: MediaStream) {
            const audioTracks = stream.getAudioTracks();
            console.log('Got stream with constraints:', constraints);
            console.log(`Using audio device: ${audioTracks[0].label}`);
            stream.addEventListener('inactive', () => {
                console.log('Stream ended ... ...');
            });
            (window as any).stream = stream; // make variable available to browser console
            var bjsSound = new Sound("mic", stream, scene);
            bjsSound.attachToMesh(sphere);
            bjsSound.play();
        }
        function handleError(error: any) {
            console.log('navigator.getUserMedia error: ', error);
        }
        navigator.mediaDevices.getUserMedia(constraints).then(handleSuccess).catch(handleError);
        return scene;
    }

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