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Manager class : Factory for creating
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DataSource,
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Players,
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Processors,
and
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DataSink.
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PlugInManager maintains all the available
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PlugIns
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CaptureDeviceManager
registers all media
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capture
devices
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PackageManager : registry for package prefix
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list for
packages that contain custom Players,
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Processors,
DataSources, and DataSinks.
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