src/windows/MediaProxy.js
function(win, lose, args) {
        var id = args[0];
        var srcUri = processUri(args[1]);

        var dest = parseUriToPathAndFilename(srcUri);
        var destFileName = dest.fileName;

        var success = function () {
            Media.onStatus(id, Media.MEDIA_STATE, Media.MEDIA_RUNNING);
        };

        var error = function (reason) {
            Media.onStatus(id, Media.MEDIA_ERROR, reason);
        };

        // Initialize device
        Media.prototype.mediaCaptureMgr = null;
        var thisM = (Media.get(id));
        var captureInitSettings = new Windows.Media.Capture.MediaCaptureInitializationSettings();
        captureInitSettings.streamingCaptureMode = Windows.Media.Capture.StreamingCaptureMode.audio;
        thisM.mediaCaptureMgr = new Windows.Media.Capture.MediaCapture();
        thisM.mediaCaptureMgr.addEventListener("failed", error);

        thisM.mediaCaptureMgr.initializeAsync(captureInitSettings).done(function (result) {
            thisM.mediaCaptureMgr.addEventListener("recordlimitationexceeded", error);
            thisM.mediaCaptureMgr.addEventListener("failed", error);

            // Start recording
            Windows.Storage.ApplicationData.current.temporaryFolder.createFileAsync(destFileName, Windows.Storage.CreationCollisionOption.replaceExisting).done(function (newFile) {
                recordedFile = newFile;
                var encodingProfile = null;
                switch (newFile.fileType) {
                    case '.m4a':
                        encodingProfile = Windows.Media.MediaProperties.MediaEncodingProfile.createM4a(Windows.Media.MediaProperties.AudioEncodingQuality.auto);
                        break;
                    case '.mp3':
                        encodingProfile = Windows.Media.MediaProperties.MediaEncodingProfile.createMp3(Windows.Media.MediaProperties.AudioEncodingQuality.auto);
                        break;
                    case '.wma':
                        encodingProfile = Windows.Media.MediaProperties.MediaEncodingProfile.createWma(Windows.Media.MediaProperties.AudioEncodingQuality.auto);
                        break;
                    default:
                        error("Invalid file type for record");
                        break;
                }
                thisM.mediaCaptureMgr.startRecordToStorageFileAsync(encodingProfile, newFile).done(success, error);
            }, error);
        }, error);
    }
function(win, lose, args) {
        var id = args[0];
        var srcUri = processUri(args[1]);

        var dest = parseUriToPathAndFilename(srcUri);
        var destFileName = dest.fileName;

        var success = function () {
            Media.onStatus(id, Media.MEDIA_STATE, Media.MEDIA_RUNNING);
        };

        var error = function (reason) {
            Media.onStatus(id, Media.MEDIA_ERROR, reason);
        };

        // Initialize device
        Media.prototype.mediaCaptureMgr = null;
        var thisM = (Media.get(id));
        var captureInitSettings = new Windows.Media.Capture.MediaCaptureInitializationSettings();
        captureInitSettings.streamingCaptureMode = Windows.Media.Capture.StreamingCaptureMode.audio;
        thisM.mediaCaptureMgr = new Windows.Media.Capture.MediaCapture();
        thisM.mediaCaptureMgr.addEventListener("failed", error);

        thisM.mediaCaptureMgr.initializeAsync(captureInitSettings).done(function (result) {
            thisM.mediaCaptureMgr.addEventListener("recordlimitationexceeded", error);
            thisM.mediaCaptureMgr.addEventListener("failed", error);

            // Start recording
            Windows.Storage.ApplicationData.current.temporaryFolder.createFileAsync(destFileName, Windows.Storage.CreationCollisionOption.replaceExisting).done(function (newFile) {
                recordedFile = newFile;
                var encodingProfile = null;
                switch (newFile.fileType) {
                    case '.m4a':
                        encodingProfile = Windows.Media.MediaProperties.MediaEncodingProfile.createM4a(Windows.Media.MediaProperties.AudioEncodingQuality.auto);
                        break;
                    case '.mp3':
                        encodingProfile = Windows.Media.MediaProperties.MediaEncodingProfile.createMp3(Windows.Media.MediaProperties.AudioEncodingQuality.auto);
                        break;
                    case '.wma':
                        encodingProfile = Windows.Media.MediaProperties.MediaEncodingProfile.createWma(Windows.Media.MediaProperties.AudioEncodingQuality.auto);
                        break;
                    default:
                        error("Invalid file type for record");
                        break;
                }
                thisM.mediaCaptureMgr.startRecordToStorageFileAsync(encodingProfile, newFile).done(success, error);
            }, error);
        }, error);
    }
Start recording audio