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The code sample for this recipe shows the use of markers encoded into the media file as well as temporary markers added on the client. You enable two scenarios in this sample: a captioning system and overlaid commercials. In the former scenario, animated and context-specific text captions are overlaid on the video at specific time points; for this, you use file-encoded markers. In the latter scenario, a small commercial-like video is overlaid on the main video at regular intervals; for this, you use clientcreated markers. You implement all this in the player you have been developing in the previous few recipes. Figure 10-23 shows both scenarios at work in the player. The caption is the white text near the upperright corner of the display, and the small Silverlight logo is actually a small video playing near the lower-right corner. Let s look at the captioning system first. The captions are implemented as independent snippets of XAML defined in an XML file named Captions.xml, keyed by a specific marker value. Listing 10-22 shows an abridged Captions.xml file.

Listing 10-22. Captions.xml sample < xml version="1.0" encoding="utf-8" > <Medias> <Media Id="http://localhost/SLBook/Ch010RichMedia/Media/Amazon_1080_WithMarkers.wmv"> <Marker Value="FirstMarker"> <![CDATA[ <Canvas xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Height="Auto" HorizontalAlignment="Stretch" Margin="0,0,0,0" VerticalAlignment="Stretch" Width="Auto" Grid.Column="1" Grid.Row="1" x:Name="overlay"> <Canvas.Resources> <Storyboard x:Name="STBD_AnimateCaption"> <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="textBlock" Storyboard.TargetProperty="(UIElement.Opacity)"> <LinearDoubleKeyFrame KeyTime="00:00:01" Value="1"/> <LinearDoubleKeyFrame KeyTime="00:00:04" Value="1"/> <SplineDoubleKeyFrame KeyTime="00:00:05" Value="0"/> </DoubleAnimationUsingKeyFrames> <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="textBlock" Storyboard.TargetProperty="(Canvas.Left)"> <SplineDoubleKeyFrame KeyTime="00:00:01" Value="375"/> <SplineDoubleKeyFrame KeyTime="00:00:02" Value="375"/> <SplineDoubleKeyFrame KeyTime="00:00:03" Value="375"/> <SplineDoubleKeyFrame KeyTime="00:00:04" Value="375"/> <SplineDoubleKeyFrame KeyTime="00:00:05" Value="0"/> </DoubleAnimationUsingKeyFrames> <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="textBlock" Storyboard.TargetProperty="(Canvas.Top)"> <SplineDoubleKeyFrame KeyTime="00:00:01" Value="35"/> <SplineDoubleKeyFrame KeyTime="00:00:02" Value="35"/> <SplineDoubleKeyFrame KeyTime="00:00:03" Value="35"/> <SplineDoubleKeyFrame KeyTime="00:00:04" Value="35"/> <SplineDoubleKeyFrame KeyTime="00:00:05" Value="0"/> </DoubleAnimationUsingKeyFrames> </Storyboard> </Canvas.Resources> <TextBlock x:Name="textBlock" Opacity="0" FontFamily="Portable User Interface" FontSize="24"

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FontWeight="Bold" Foreground="#FFFFFDFD" Text="Beautiful Sunset" TextAlignment="Right" TextWrapping="Wrap" HorizontalAlignment="Left" VerticalAlignment="Top"/> </Canvas>]]> </Marker> <Marker Value="SecondMarker"> <![CDATA[<Canvas Height="Auto" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" HorizontalAlignment="Stretch" Margin="0,0,0,0" VerticalAlignment="Stretch" Width="Auto" Grid.Column="1" Grid.Row="1" x:Name="overlay"> <Canvas.Resources> <Storyboard x:Name="STBD_AnimateCaption"> <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="textBlock" Storyboard.TargetProperty="(UIElement.Opacity)"> <LinearDoubleKeyFrame KeyTime="00:00:01" Value="1"/> <LinearDoubleKeyFrame KeyTime="00:00:04" Value="1"/> <SplineDoubleKeyFrame KeyTime="00:00:05" Value="0"/> </DoubleAnimationUsingKeyFrames> <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="textBlock" Storyboard.TargetProperty="(Canvas.Left)"> <SplineDoubleKeyFrame KeyTime="00:00:01" Value="375"/> <SplineDoubleKeyFrame KeyTime="00:00:02" Value="375"/> <SplineDoubleKeyFrame KeyTime="00:00:03" Value="375"/> <SplineDoubleKeyFrame KeyTime="00:00:04" Value="375"/> <SplineDoubleKeyFrame KeyTime="00:00:05" Value="0"/> </DoubleAnimationUsingKeyFrames> <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="textBlock" S Storyboard.TargetProperty="(Canvas.Top)"> <SplineDoubleKeyFrame KeyTime="00:00:01" Value="35"/> <SplineDoubleKeyFrame KeyTime="00:00:02" Value="35"/> <SplineDoubleKeyFrame KeyTime="00:00:03" Value="35"/> <SplineDoubleKeyFrame KeyTime="00:00:04" Value="35"/> <SplineDoubleKeyFrame KeyTime="00:00:05" Value="0"/> </DoubleAnimationUsingKeyFrames> </Storyboard> </Canvas.Resources> <TextBlock x:Name="textBlock" Opacity="0" FontFamily="Portable User Interface" FontSize="24" FontWeight="Bold" Foreground="#FFFFFDFD" Text="Is that a leopard "

marker.setOpen(true)

TextAlignment="Right" TextWrapping="Wrap" HorizontalAlignment="Left" VerticalAlignment="Top"/> </Canvas>]]> </Marker> </Media> </Medias> The root element <Medias> is expected to have multiple <Media> elements, each uniquely identified by its Id attribute set to the media URI. Each <Media> element in turn can have many <Marker> elements with a Value attribute set to the marker value, and a CDATA section containing the XAML snippet to be used for that marker. Note that you stipulate that each XAML snippet has at least one Storyboard defined, named STBD_AnimateCaption; you use it later in the code. Also note that the TextBlock at the end of the XAML snippet has the caption text set on the Text property.

N ote Several industry standards are defined for including captions and subtitles in digital media for both

1

television and broadband delivery mechanisms. You can look at the Synchronized Multimedia Integration Language (SMIL) specification at www.w3.org/TR/SMIL2/or the Synchronized Accessible Media Interchange (SAMI) specification at msdn.microsoft.com/en-us/library/dd562301(VS.85).aspx. The schema outlined here is not aligned with an industry standard by any means. If this mechanism works for you as is, we are happy that you have benefited. However, if your goal is to create a production-ready captioning system, we also encourage you to look at some of the industry standards and possibly combine them with the knowledge gained here to achieve your goals with Silverlight.

You also encode the media file (in the sample Amazon_1080.wmv file) with markers placed at appropriate time points, with their Value properties set to match the Value attributes of the <Marker> elements in the Captions.xml file (we discussed the Expression Encoder based encoding process briefly in the previous section). To have this file available to the player to play, you place the encoded file for progressive download in the same location as the other progressively downloaded media files from Recipe 10-2 and add a new entry to the Downloads.xml file. To see how this works, refer back to Recipe 102. You define a new operation named GetCaptionsForMedia() on the MediaLocationProvider WCF service that you have been using since Recipe 10-2. GetCaptionsForMedia() accepts the Media URI and returns the complete XML for the corresponding <Media> element. You also use a UriTemplate in the operation contract to map the operation to the format <service address>/Captions MediaId={MediaUri}, where MediaUri is the URI of the media you are trying to download and play. We do not list GetCaptionsForMedia(), and you are encouraged to look at 7 for more about WCF services and the sample code for the implementation. The player XAML from the previous recipes undergoes a few minor changes. We list the player XAML in Listing 10-23, but we left out the Resources section for brevity and because there are no changes to it.

4. Attach this Gmarker to the Google Maps instance you invoked:

delegate(object sender, GetProductsCompletedEventArgs e) { dgProducts.ItemsSource = e.Result; }); client.GetProductsAsync(); }

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