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Capture a Video in Windows Store Apps

By Deepak Middha on Oct 18, 2012
In this app I described how to capture a Video in a Windows Store App using JavaScript.

Introduction

In this article I describe how to create a Windows Store App to capture a video using JavaScript. In this article we capture a video from a webcam. For this app it is necessary for you to have a webcam in your system and for all the drivers of the webcam to be properly installed. If you don't have a webcam or your webcam does not work then the app will run but of course it cannot capture video from a webcam.

I assume you can create a simple Windows Store App using JavaScript. For more help visit Simple Windows Store Apps using JavaScript. In my previous article i describe how to create a Windows Store Apps to capture a photo using JavaScript. You can visit this at Capture a Photo in Windows Store Apps using Java Script.

To start the creation of the app, add two JavaScript pages by right-clicking on the js folder in the Solution Explorer and select Add > new item > JavaScript Page and then give an appropriate name. In the same way, add one HTML page to your project.

vidio-in-windows-store-apps.jpg

Write the following code in default.html:

<!DOCTYPE html>

<html>

<head>

    <meta charset="utf-8" />

    <title>App</title>

    <link rel="stylesheet" href="//Microsoft.WinJS.1.0/css/ui-light.css" />

    <script src="//Microsoft.WinJS.1.0/js/base.js"></script>

    <script src="//Microsoft.WinJS.1.0/js/ui.js"></script>

    <link rel="stylesheet" href="/css/default.css" />

    <script src="/js/script1.js"></script>

    <script src="/js/default.js"></script>

</head>

<body role="application" style="background-color: lightgray">

    <center><div id="rootGrid">       

        <div id="content">

            <h1 id="featureLabel"></h1>

            <div id="contentHost"></div>

        </div>       

    </div></center>

</body>

</html>

Write the following code in default.js:
 

(function () {

    "use strict";

    var appTitle = "Capture a Vidio";

    var pages = [

        { url: "page.html" }

    ];

    function activated(eventObject) {

        if (eventObject.detail.kind === Windows.ApplicationModel.Activation.ActivationKind.launch) {

            eventObject.setPromise(WinJS.UI.processAll().then(function () {

                var url = WinJS.Application.sessionState.lastUrl || pages[0].url;

                return WinJS.Navigation.navigate(url);

            }));

        }

    }

    WinJS.Navigation.addEventListener("navigated", function (eventObject) {

        var url = eventObject.detail.location;

        var host = document.getElementById("contentHost");

        host.winControl && host.winControl.unload && host.winControl.unload();

        WinJS.Utilities.empty(host);

        eventObject.detail.setPromise(WinJS.UI.Pages.render(url, host, eventObject.detail.state).then(function () {

            WinJS.Application.sessionState.lastUrl = url;

        }));

    });

    WinJS.Namespace.define("Apps", {

        appTitle: appTitle,

        pages: pages

    });

    WinJS.Application.addEventListener("activated", activated, false);

    WinJS.Application.start();

})(); 

Write the following code in page.html:
 

<!DOCTYPE html>

<html>

<head>

    <title></title>

    <link rel="stylesheet" href="/css/capturevideo.css" />

    <script src="/js/script.js"></script>

</head>

<body>

    <div data-win-control="Apps.pageInput">

        <button id="captureButton">Capture Video</button>

        <button id="resetButton">Reset</button>

        <br />

        <br />

    </div>

    <div data-win-control="Apps.pageOutput">

        <video class="imageHolder" id="capturedVideo" autoplay="autoplay" controls="controls"></video>

    </div>

</body>

</html> 


Write the following code in script.js:
 

(function () {

    "use strict";

 

    var videoKey = "capturedVideo";

    var localSettings = Windows.Storage.ApplicationData.current.localSettings;

    var page = WinJS.UI.Pages.define("page.html", {

        ready: function (element, options) {

            document.getElementById("captureButton").addEventListener("click", captureVideo, false);

            document.getElementById("resetButton").addEventListener("click", reset, false);

            document.getElementById("resetButton").style.visibility = "hidden";

 

            if (localSettings.values[videoKey]) {

                document.getElementById("captureButton").disabled = true;

                reloadVideo();

            }

        }

    });

    function captureVideo() {

        WinJS.log && WinJS.log("", "app", "status");

        var dialog = new Windows.Media.Capture.CameraCaptureUI();

        dialog.videoSettings.format = Windows.Media.Capture.CameraCaptureUIVideoFormat.mp4;

        dialog.captureFileAsync(Windows.Media.Capture.CameraCaptureUIMode.video).done(function (file) {

            if (file) {

                var videoBlobUrl = URL.createObjectURL(file, { oneTimeOnly: true });

                document.getElementById("capturedVideo").src = videoBlobUrl;

                document.getElementById("resetButton").style.visibility = "visible";

                localSettings.values[videoKey] = file.path;

            } else {

                WinJS.log && WinJS.log("No video captured.", "app", "status");

            }

        }, function (err) {

            WinJS.log && WinJS.log(err, "app", "error");

        });

    }

 

    function reset() {

        WinJS.log && WinJS.log("", "app", "status");

        document.getElementById("capturedVideo").src = "";

        document.getElementById("resetButton").style.visibility = "hidden";

        localSettings.values.remove(videoKey);

    }

 

    function reloadVideo() {

        Windows.Storage.StorageFile.getFileFromPathAsync(localSettings.values[videoKey]).done(function (file) {

            document.getElementById("capturedVideo").src = URL.createObjectURL(file, { oneTimeOnly: true });

            document.getElementById("resetButton").style.visibility = "visible";

            document.getElementById("captureButton").disabled = false;

        }, function (err) {

            localSettings.values.remove(videoKey);

            document.getElementById("captureButton").disabled = false;

            WinJS.log && WinJS.log(err, "app", "error");

        });

    }

})(); 


Write the following code in script1.js:

 

(function () {  

    var pageOutput = WinJS.Class.define(

        function (element, options) {

            element.winControl = this;

            this.element = element;

            new WinJS.Utilities.QueryCollection(element)

                        .setAttribute("role", "region")

                        .setAttribute("aria-labelledby", "outputLabel")

                        .setAttribute("aria-live", "assertive");

            element.id = "output";

 

            this._addOutputLabel(element);

            this._addStatusOutput(element);

        }, {

            _addOutputLabel: function (element) {

                var label = document.createElement("h2");

                label.id = "outputLabel";

                label.textContent = "Output";

                element.parentNode.insertBefore(label, element);

            },

            _addStatusOutput: function (element) {

                var statusDiv = document.createElement("div");

                statusDiv.id = "statusMessage";

                element.insertBefore(statusDiv, element.childNodes[0]);

            }

        }

    );

    var currentpageUrl = null;

    WinJS.Navigation.addEventListener("navigating", function (evt) {

        currentpageUrl = evt.detail.location;

    });

 

    WinJS.log = function (message, tag, type) {      

            var statusDiv = document.getElementById("statusMessage");         

    }; 

    function activated(e) {

        WinJS.Utilities.query("#featureLabel")[0].textContent = Apps.appTitle;

    }

 

    WinJS.Application.addEventListener("activated", activated, false);

    WinJS.Namespace.define("Apps", {       

        pageOutput: pageOutput

    });  

})();


Output:

vidios-ca[pture-in-windows-store-apps.jpg

Summary


In this app I described how to capture a video in a Windows Store App using JavaScript. I hope this article has helped you to understand this topic. Please share if you know more about this. Your feedback and constructive contributions are welcome.

Deepak Middha

Deepak Middha is one time Microsoft MVP(Client App Dev) , working as Sr. Software Developer with lots of hands on experience using ASP.NET 2.0/3.5, AJAX, MVC, C#,  SQL Server 2005/2008/2012, WCF, JQuery and Silverl... Read more

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