Video Display

This is a modified example of an XIL that captures video and displays it.

Changes to video attributes that affect the color of the image (brightness, contrast, hue, and so on) are also made to the database used by the control panel. Thus, the defaults for these settings depend on how they were last set. If you run this application once and set the brightness to a particular value, this value will be the default setting when you next run a video application.

The following shows the command-line syntax for the xil_display example:

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hostname% xil_display options

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The following table describes command options and the default setting.

Table 4-7 xil_display Options

Legal Options	Description and Values	Default
-s %d	Shrink factor	2
-I %d	Select input channel	1
-f %d	Frames to capture	100
-w %d	Capture subimage width	640
-h %d	Capture subimage height	480
-i %d	Frames to skip between capture	0
-m %d	Maximum frames to buffer	2
-x %d	x window location	(random)
-y %d	y window location	(random)
-D %s	Name of device	/dev/olk0
Legal Switches
-g	Enable grayscale mode
-E	Exit on first error
-d	Do not display result of capture
Video Attributes
-B %d	Brightness	none
-C %d	Contrast	none
-H %d	Hue	none
-U %d	Saturation/gain U component	none
-V %d	Saturation/gain V component	none
-c %d	Colormap version (0=XIL std, 1=XIL gamma corrected)	1

The colormap version option does nothing if the current display depth is 24 bits. On 8-bit display depths, it affects which colormap is installed for the video window. The XIL versions cause the SunVideo Plus to capture 16-bit video data which is then dithered in software by the XIL molecules to 8 bits.

Example Usage

To display video, type:

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hostname% xil_display

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