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Though now generally out of favor due to the introduction of Smooth Streaming, Silverlight still supports streaming media content over HTTP through server-side play lists and the MMS protocol. The MMS protocol was built for sending many short messages to a client, and uses a URI that begins with mms:// instead of http:// or https://. When a media file is streamed through this protocol, your Silverlight application maintains an open connection with the hosting server. This has two advantages. It enables you to jump to any point in time within a media file, and streaming usually provides a more cost-effective approach for delivering audio and video content because only the requested content is downloaded, plus a little extra. This content is configurable through the BufferingTime property. When evaluating media streaming options for HD content, lean toward IIS Smooth Streaming over Windows Media Streaming. IIS Smooth StreamTIP
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ing is better optimized to provide a great user experience with high bit rate content, such as HD video. The BufferingTime property enables you to view or specify how much of a buffer should be downloaded. By default, this TimeSpan value is set to buffer 5 seconds worth of content. If you re streaming a 1-minute video, the video won t begin playing until at least 5 seconds of it has been retrieved. While this retrieval is occurring, the CurrentState property of the MediaElement (which we ll discuss shortly) will be set to Buffering. While the MediaElement is in a Buffering state, it ll halt playback. You can check to see what percentage of the buffering is completed by checking the BufferingProgress property. The BufferingProgress property gives you access to the percentage of the completed buffering. Because this property value is always between 0.0 and 1.0, you need to multiply it by 100 to get the percentage. When this property changes by a value greater than 5 percent, the BufferingProgressChanged event will be fired. This event gives you the flexibility to keep your users informed through a progress bar or some other UI construct. As you can imagine, this type of component can be valuable when you re streaming content. Often, streamed content can be quite lengthy. Because of this, it can be advantageous to use MBR) files. MBR files enable you to provide the highest quality experience based on the available bandwidth. The really cool part is that the MediaElement will automatically choose which bit rate to use based on the available bandwidth. In addition, the MediaElement will automatically attempt to progressively download the content if it can t be streamed. That s thinking progressively.
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Progressive downloading involves requesting a media file over the HTTP or HTTPS protocol. When this occurs, the requested content is temporarily downloaded to a user s computer, enabling the user to quickly access any part of the media that has been downloaded. In addition to fast access, using a progressive download generally provides a higher-quality media experience. Progressive downloading usually requires a
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longer initial wait time than streaming, so you may want to keep your users informed of how much wait time is left. Keeping your users informed is made possible through two key items within the MediaElement. The first item is a property called DownloadProgress. It gives you access to the percentage of the content that has been downloaded. The other item is an event called DownloadProgressChanged. This event gives you the ability to do something such as update a progress bar whenever the DownloadProgress property changes. In listing 20.1, both these items are used to show the percentage of requested content that s available.
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Listing 20.1 The percentage of content ready for use within a MediaElement XAML:
<UserControl x:Class="20.Page" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Width="400" Height="300"> <Canvas x:Name="LayoutRoot" Background="White"> <TextBlock x:Name="tb" Canvas.Top="0" /> <MediaElement x:Name="me" Canvas.Top="20" MediaElement Source="http://www.silverlightinaction.com/video3.wmv" DownloadProgressChanged="me_DownloadProgressChanged" /> </Canvas> </UserControl>
using System; using System.Windows; using System.Windows.Controls; namespace 20 { public partial class Page : UserControl { public Page() { InitializeComponent(); } void me_DownloadProgressChanged(object sender, RoutedEventArgs e) { double percentage = me.DownloadProgress * 100.0; string text = String.Format("{0:f}", percentage) + "%"; tb.Text = text; } } }
This example shows a large video file (~13MB) being progressively downloaded B. As this download progresses, the completion percentage is calculated C. This percentage is then formatted and presented to the user as the video is downloaded. Whether you stream content or progressively download it, the MediaElement expects certain formats. These file formats are then retrieved over one of the accepted protocols (HTTP, HTTPS, or MMS). The Source property simplifies this retrieval process, and it works with both audio and video files. Once the media source is loaded,
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