相機到畫布在移動應用程序

Question

我正在製作移動應用程序，它會顯示live image of back camera on canvas。我已經嘗試了太多cordova plugin，但在所有系統應用程序打開拍照或視頻。

是否有任何插件或編碼方式，所以我可以從back or front camera的畫布上看到實況。

謝謝。

Answer 1

HTML代碼

<video id="video" width="640" height="480" autoplay></video> 
<button id="snap">Snap Photo</button> 
<canvas id="canvas" width="640" height="480"></canvas> 

JS代碼

// Put event listeners into place 
window.addEventListener("DOMContentLoaded", function() { 
    // Grab elements, create settings, etc. 
    var canvas = document.getElementById("canvas"), 
    context = canvas.getContext("2d"), 
    video = document.getElementById("video"), 
    videoObj = { "video": true }, 
    errBack = function (error) { 
     console.log("Video capture error: ", error.code); 
    }; 
    // Put video listeners into place 
    if (navigator.getUserMedia) { // Standard 
     navigator.getUserMedia(videoObj, function (stream) { 
      video.src = stream; 
      video.play(); 
     }, errBack); 
    } else if (navigator.webkitGetUserMedia) { // WebKit-prefixed 
     navigator.webkitGetUserMedia(videoObj, function (stream) { 
      video.src = window.webkitURL.createObjectURL(stream); 
      video.play(); 
     }, errBack); 
    } 
    else if (navigator.mozGetUserMedia) { // Firefox-prefixed 
     navigator.mozGetUserMedia(videoObj, function (stream) { 
      video.src = window.URL.createObjectURL(stream); 
      video.play(); 
     }, errBack); 
    } 
}, false); 
document.getElementById("snap") 
.addEventListener("click", function() { 
setInterval(function(){ 
    context.drawImage(video, 0, 0, 640, 480); 
},1); 

}); 

通知，支持的API getUserMedia瀏覽器並不意味着它可以調用手機上的所有的相機，它是唯一能夠調用前相機可能。