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Quadro SDI Output PG-03776-001_v06

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9 DEVICE FEEDBACK

The WGL_NV_video_out/GLX_NV_video_out as well as the GL_NV_present_video

extensions provides device feedback. This functionality provides the following

information to the calling application.

 Number of buffers queued for SDI scanout.

 Vertical retrace interval count.

 Time at which a frame was scanned out.

 Number of vertical retrace intervals during which the same frame was scanned out.

This information can subsequently be used by an application to determine the video

transfer latency within the system and if frames on the SDI output have been dropped or

duplicated. Applications can then use this information to make adjustments in the data

sent to the SDI device.

9.1 DETERMINING THE NUMBER OF QUEUED

BUFFERS

The driver software for the Quadro SDI maintains a collection of internal buffers. These

internal buffers permit an application to queue a frame and continue in order to begin

processing future frames. The default number of buffers is five. To change this default

number of internal buffers, see the advanced topic Specifying Internal Buffer Queue Length,

later in this document.

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