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

        var srcUri = processUri(args[1]);

        var createAudioNode = !!args[2];
        var thisM = Media.get(id);

        Media.prototype.node = null;

        var prefix = args[1].split(':').shift();
        var extension = srcUri.extension;
        if (thisM.node === null) {
            if (SUPPORTED_EXTENSIONS.indexOf(extension) === -1 && SUPPORTED_PREFIXES.indexOf(prefix) === -1) {
                if (lose) {
                    lose({ code: MediaError.MEDIA_ERR_ABORTED });
                }
                return false; // unable to create
            }

            // Don't create Audio object in case of record mode
            if (createAudioNode === true) {
                thisM.node = new Audio();
                thisM.node.msAudioCategory = "BackgroundCapableMedia";
                thisM.node.src = srcUri.absoluteCanonicalUri;

                thisM.node.onloadstart = function () {
                    Media.onStatus(id, Media.MEDIA_STATE, Media.MEDIA_STARTING);
                };

                thisM.node.ontimeupdate = function (e) {
                    Media.onStatus(id, Media.MEDIA_POSITION, e.target.currentTime);
                };

                thisM.node.onplaying = function () {
                    Media.onStatus(id, Media.MEDIA_STATE, Media.MEDIA_RUNNING);
                };

                thisM.node.ondurationchange = function (e) {
                    Media.onStatus(id, Media.MEDIA_DURATION, e.target.duration || -1);
                };

                thisM.node.onerror = function (e) {
                    // Due to media.spec.15 It should return MediaError for bad filename
                    var err = e.target.error.code === MediaError.MEDIA_ERR_SRC_NOT_SUPPORTED ?
                        { code: MediaError.MEDIA_ERR_ABORTED } :
                        e.target.error;

                    Media.onStatus(id, Media.MEDIA_ERROR, err);
                };

                thisM.node.onended = function () {
                    Media.onStatus(id, Media.MEDIA_STATE, Media.MEDIA_STOPPED);
                };
            }
        }

        return true; // successfully created
    }
function(win, lose, args) {
        var id = args[0];

        var srcUri = processUri(args[1]);

        var createAudioNode = !!args[2];
        var thisM = Media.get(id);

        Media.prototype.node = null;

        var prefix = args[1].split(':').shift();
        var extension = srcUri.extension;
        if (thisM.node === null) {
            if (SUPPORTED_EXTENSIONS.indexOf(extension) === -1 && SUPPORTED_PREFIXES.indexOf(prefix) === -1) {
                if (lose) {
                    lose({ code: MediaError.MEDIA_ERR_ABORTED });
                }
                return false; // unable to create
            }

            // Don't create Audio object in case of record mode
            if (createAudioNode === true) {
                thisM.node = new Audio();
                thisM.node.msAudioCategory = "BackgroundCapableMedia";
                thisM.node.src = srcUri.absoluteCanonicalUri;

                thisM.node.onloadstart = function () {
                    Media.onStatus(id, Media.MEDIA_STATE, Media.MEDIA_STARTING);
                };

                thisM.node.ontimeupdate = function (e) {
                    Media.onStatus(id, Media.MEDIA_POSITION, e.target.currentTime);
                };

                thisM.node.onplaying = function () {
                    Media.onStatus(id, Media.MEDIA_STATE, Media.MEDIA_RUNNING);
                };

                thisM.node.ondurationchange = function (e) {
                    Media.onStatus(id, Media.MEDIA_DURATION, e.target.duration || -1);
                };

                thisM.node.onerror = function (e) {
                    // Due to media.spec.15 It should return MediaError for bad filename
                    var err = e.target.error.code === MediaError.MEDIA_ERR_SRC_NOT_SUPPORTED ?
                        { code: MediaError.MEDIA_ERR_ABORTED } :
                        e.target.error;

                    Media.onStatus(id, Media.MEDIA_ERROR, err);
                };

                thisM.node.onended = function () {
                    Media.onStatus(id, Media.MEDIA_STATE, Media.MEDIA_STOPPED);
                };
            }
        }

        return true; // successfully created
    }
Initiates the audio file