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Specifying Device Information

To specify information about a particular device in an IMDF file, use the Device element. You can include as many Device nodes in an IMDF file as you want but they must all be children of the root node.

In a Device node, you specify the name of the device as an attribute. The name is typically a character vector defined by the device's SDK. Using other IMDF elements as children of the Device node, you can specify information about device-specific properties, video formats, and trigger information.

The following example outlines how to use these elements to create Device nodes. The words in italics represent text you define.

	<Device device=devicename>
		<VideoFormat name=formatname>
		<Property constraint=constraint_value

			<TriggerSource id=ID name=string>
				<TriggerCondition id=ID name=string/>

The following table summarizes the elements that can be children of a Device node, in the order they must be specified. For an example, see Example: Device Node.





Specifies information about a video format. This is an optional element. A Device node can contain multiple VideoFormat nodes.

name=formatname, where formatname is a character vector that identifies a particular device


Include a Section node in another node. This is an optional element. A Device node can contain multiple Include nodes.

tag=sectionname, where sectionname is a character vector that identifies a particular Section node


Groups a set of nodes into a Section node. This is an optional element. A Device node can contain multiple Section nodes.

name=sectionname, where sectionname is the name you want to assign to the group of nodes


Describes the properties of a device. This is an optional element. A Device node can contain multiple Property nodes.

See Specifying Property Information.


Defines the source of video data. This is an optional element.

See Specifying Video Sources


Provides information about hardware triggers, such as source and condition. This is an optional element.

Note: A Device node can contain only one TriggerInfo node.

See Specifying Hardware Trigger Information.

Example: Device Node

The following example creates a Device node containing property and trigger information. For more information about the Property element, see Specifying Property Information. For more information about the TriggerInfo element, see Specifying Hardware Trigger Information.

<Device name="PCVision">
   <Property optional="on"
      <EnumConstraintValue id="1" name="strippedSync" />
      <EnumConstraintValue id="2" name="separateSync" />
      <EnumConstraintValue id="3" name="compositeSync" />
      <EnumConstraintValue id="4" name="variableScan" />

   <Property optional="on"
      <EnumConstraintValue id="0" name="evenField" />
      <EnumConstraintValue id="1" name="oddField" />

      <TriggerSource id="1" name="extTrig">
         <TriggerCondition id="0" name="risingEdge"/>
         <TriggerCondition id="1" name="fallingEdge"/>