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Designing Hardware and Drivers for the Microsoft® Windows® Family of Operating Systems - page 12 / 13

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Digital Video Camcorder Support in Windows 12

Control buttons in the bottom left section of the page can be used to control the transport.  Commands are available for play, pause, fast forward, and rewind.  When in a paused state, buttons appear for frame advance and frame rewind.  If the Slow box is checked, fast forward or rewind will play in slow motion.  You can also cue the camera using PauseRecord and then use Record when transmitting AVI files to record them on the tape.  

If the DV camcorder supports ATN search, a user can enter a target timecode in the Timecode/Track Number section of the property page and then click the Search button to advance the tape to that position. The Search button is available only when the DV camcorder is paused or stopped. The timecode is assumed to be contiguous and to start with 0:0:0:0 at the beginning of the tape, so the timecode and track number are in synch.

In the debug version of Kswdmcap.ax, this property page displays an edit field and a Send button (not shown). Developers can use the edit field and Send button to issue raw AV/C commands to the device when debugging their DV camcorder applications.  

References

Microsoft DirectX SDK, which includes the DirectShow documentation. The DirectX SDK is available through MSDN Professional subscription. DirectX SDK documentation is available online at http://msdn.microsoft.com/library/ under Graphics and Multimedia > DirectX.

Windows DDK is available at http://www.microsoft.com/ddk/ and through MSDN Professional subscription. Windows DDK documentation is available online at http://msdn.microsoft.com/library/ under Windows Development > Device Drivers.

See also the following stream class articles and documentation at http://www.microsoft.com/hwdev/vidcap/:

Navigating to WDM Video Capture at: http://www.microsoft.com/hwdev/desinit/wdmvid.htm

WDM Video Capture Overview at: http://www.microsoft.com/hwdev/desinit/vidcap.htm

DV Video Data and AVI Files at: http://www.microsoft.com/hwdev/desinit/dvavi.htm

September 28, 2001

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