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You then create a new instance of the WaveFormatEx class and initialize its various members with information from the audio format data The WaveFormatEx data structure is used to represent information that is required by the audio codec to successfully process waveform audio (of which PCM audio is one type) To learn more about the WaveFormatEx data structure, you can refer to msdnmicrosoftcom/en-us/library/dd757720(VS85)aspx We have created a managed version of the type, and you can find it in the accompanying sample code Once initialized, you use a string representation of the WaveFormatEx data as value to the MediaStreamAttributeKeysCodecPrivateData key and add as a part of the MediaStreamDescription for the audio stream You use the selected video format in a similar fashion to set up the MSS for video processing In the VideoSink_FormatChanged() event handler, you add the MediaStreamDescription for MediaStreamType.

Video, setting the FourCC code to RGBA, the MediaStreamAttributeKeysHeight and MediaStreamAttributeKeysWidth to VideoFormatPixelHeight and VideoFormatPixelWidth from the selected video format, and the CodecPrivateData to an empty string since you do not need to initialize a codec to process RGBA frames You also set height and width keys for each individual sample to the same corresponding values from the selected video format Once both the audio and video formats are used to initialize the MSS, you attach the MSS to the MediaElement, using the SetSource() method on the MediaElement Since the actual processing of the samples is done in background threads, you need a way to pass on the samples to the background thread as they are generated.

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In the VideoSink_SampleGenerated() and the AudioSink_SampleGenerated() event handlers in Listing 10-40, you will note two instances of the Queue type, namely VideoSampleBuffer and AudioSampleBuffer, to store the samples as they are generated You protect the code with a critical section, since the SampleGenerated events are raised on their own threads separate from the UI thread on which the MSS was created Once you store the samples, you signal the sample processing threads of sample arrival by setting an appropriate AutoResetEvent instance You also need to inform the background sample processing threads when a request for a sample arrives from the MediaElement In the implementation of the GetSampleAsync() method of the MSS, you set a ManualResetevent instance named AudioSampleRequest to signal the request of an audio sample and a different ManualResetEvent instance named VideoSampleRequest to signal the same for video.

When an EL expression is used as an attribute value, it can return any kind of object as long as the component accepts that object as input. For example, the following expression will be evaluated as a Boolean object: <window if="${some > 10}">

So what happens when a sample arrives from the sinks or gets requested by the MediaElement To understand, let s take a look at the VideoSampleDispatch_DoWork() method that defines the processing for the BackgroundWorker named VideoSampleDispatch discussed earlier You start with an infinite loop, which keeps running as long as the MSS instance is valid Inside the loop, you start by blocking on the ManualResetEvent named VideoSampleRequest; recall that this gets signaled when a sample request arrives from the MediaElement Once you receive a request, you check the VideoSampleBuffer queue to see.

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