WebMatrix HTML5 Video Tag Helper

Html5Video.cshtml

@functions {

    private static bool IsParam(string parameter)
    {
        if( !string.IsNullOrEmpty( parameter ) )
        {
            return true;
		}
        else
        {
            return false;
		}
	}

}

@helper CreateAlternateDownloadLinks(string prefix,
    string wmvUrl = "",
    string mp4Url = "",
    string webmUrl = "",
    string oggUrl = "")
{
    if( IsParam( wmvUrl ) )
    {
        @AlternateDownloadLink( wmvUrl, prefix + " wmv")
    }
    if( IsParam( mp4Url ) )
    {
        @AlternateDownloadLink( mp4Url, prefix + " mp4" )
	}
    if( IsParam( webmUrl ) )
    {
        @AlternateDownloadLink( webmUrl, prefix + " webm")
	}
    if( IsParam( oggUrl ) ) 
    {
        @AlternateDownloadLink( oggUrl, prefix + " ogg")
	}                    
}

@helper AlternateDownloadLink(string url, string text)
{
    <a href="@url">@text</a>
}

@helper Create( string wmvUrl = "",
                string mp4Url = "",
                string webmUrl = "",
                string oggUrl = "",
                int width = 400,
                int height = 250,
                string poster = "",
                string silverlightPlayerXapUrl = "",
                string silverlightPlayerInitParams = "",
                string flashPlayerUrl = "",
                string flashPlayerVars = "",
                string alternateDownloadPrefixText = ""
)
{
    <video id="video" width="@width" height="@height" preload controls poster="@poster">
        @if( IsParam( wmvUrl ) )
        {
            <source src="@wmvUrl"/>
        }
        @if( IsParam( mp4Url ) )
        {
            <source src="@mp4Url" type="video/mp4"/>
		}
        @if( IsParam( webmUrl ) )
        {
            <source src="@webmUrl" type="video/webm" codecs="vp8, vorbis"/>
		}
        @if( IsParam( oggUrl ) )
        {
            <source src="@oggUrl" type="video/ogg" codecs="theora, vorbis"/>
		}
        @if( IsParam( silverlightPlayerXapUrl ) && IsParam( silverlightPlayerInitParams ) )
        {
            <object data="data:application/x-silverlight-2," type="application/x-silverlight-2" width="@width" height="@height">
                <param name="source" value="@silverlightPlayerXapUrl" />
                <param name="initParams" value="@silverlightPlayerInitParams" />
                <param name="background" value="#00FFFFFF" />
                <a href="http://go.microsoft.com/fwlink/?LinkID=124807" style="text-decoration: none;">
                <img src="http://go.microsoft.com/fwlink/?LinkId=108181" alt="Get Microsoft Silverlight" style="border-style: none"/>
                </a>
            </object>
		}
        @if( IsParam( flashPlayerUrl ) && IsParam( flashPlayerVars ) )
        {
            <object width="@width" height="@height" type="application/x-shockware-flash" data="@flashPlayerUrl">
                <param name="movie" value="@flashPlayerUrl"/>
                <param name="allowfullscreen" value="true"/>
                <param name="flashvars" value="@flashPlayerVars"/>
			</object>   
		}        
        @if( IsParam( alternateDownloadPrefixText ) )
        {
            <div id="alternate-download-links">
                @CreateAlternateDownloadLinks(alternateDownloadPrefixText, wmvUrl, mp4Url, webmUrl, oggUrl)                
            </div>                
		}
	</video>
}