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CHAPTER 4 MEDIA INTEGRATION
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TimelineMarker Collection
Accesses the collection of timeline markers. Although the collection itself is read-only, it is possible to dynamically add timeline markers. These are temporary since they are not saved to the media and are reset if the Source property is changed. Duration of the currently loaded media; read-only. The height of the video based on what the video file itself reports; read-only. The width of the video based on what the video file itself reports; read-only. The current position in the media file. Gets the number of frames per second being rendered by the media. Sets or retrieves the source of the current media file. Gets or sets how the media fills its bounding rectangle. See the Images section of this chapter for a discussion of this property. Gets or sets the volume of the media based on a linear scale. The value can be between 0 and 1; the default is 0.5.
NaturalDuration NaturalVideoHeight
Duration int
NaturalVideoWidth
Position RenderedFramesPerSecond
TimeSpan double
Source Stretch
Uri Stretch
Volume
double
Table 4-11. Key Methods of MediaElement
Method
Pause
Description
Pauses the media at the current position if it is possible to pause. If the media cannot be paused, this method does nothing. Plays the media from the current position if the media can be played.
Play
CHAPTER 4 MEDIA INTEGRATION
RequestLog
Sends a request to generate a log, which will then be raised through the LogReady event. What this method does depends on the current state of the media. Closed: No operation. Opening: Queues the request and raises the log when the MediaOpened event is raised. Individualizing: Generates the log. AcquiringLicense: Generates the log. Buffering: Generates the log. Playing: Generates the log. Paused: Generates the log. Stopped: Generates the log. Used when you want to set the source of the media to a Stream object. Use the Source property to set the URI of the media file. Stops the media from playing, and sets the current position to 0.
SetSource
Stop
Table 4-12. Key Events of MediaElement
Event
BufferingProgressChanged
Description
Fires each time BufferingProgress changes by at least 0.05 or when it reaches 1.0. Fires when the state of the media changes. If states transition quickly (such as bouncing between buffering and playing), some transitions can be lost. Fires when the progress of the downloading media changes. Use the DownloadProgress property to discover the current progress. Occurs when the log is ready. Note that this event is only raised for progressive downloads. It can be raised either by a specific request (the RequestLog method) or by the generation of a log due to an automatic log event such as Seek, Stop, or SourceChanged. Fires when a timeline marker is reached. The event handler method is passed a TimelineMarkerRoutedEventArgs instance, which exposes a Marker property of type TimelineMarker. Fires when the media is done playing. Fires when there is a problem with the media source (e.g., when the media can t be found or when the format is incorrect). Fires after the media file is opened and validated, and the headers are read.
CurrentStateChanged
DownloadProgressChanged
LogReady
MarkerReached
MediaEnded MediaFailed
MediaOpened
Since a variety of state changes can happen to media, such as a video switching from playing to buffering when it needs to load more of the file, in most applications you will want to implement an
CHAPTER 4 MEDIA INTEGRATION
event handler for CurrentStateChanged. The states and state transitions are shown in Figure 4-11. The one transition left out of this diagram is when a new source is set for MediaElement, the state will change to the Opening state, unless the source is set to null value that will result in the state changing to the Closed state.
Source is set
AutoPlay: false
Opening
AutoPlay: true
Play() Stopped Stop() Play() Buffering
Pause()
Paused (Automatic transitions)
Pause()
Stop()
Playing
Figure 4-11. States and state transitions of MediaElement
Caution Avoid not-specified states of the media by checking the CurrentState property. As an example, avoid playing media while it s in the opening state.
While it s fairly simple to specify a source for MediaElement, set AutoPlay to true (which is actually the default state, so there is no need to specify specifically), and let it just go, you probably want to build
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