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Device Setup and Control

Quadro SDI Output PG-03776-001_v06 | 7

On Linux, use the XNVCTRLQueryAttribute function to query NV_CTRL_GVO_SUPPORTED

to determine if the X screen supports video output. This call will fail if video output is

not supported on the current X screen, or if the video output is already in use by the

desktop or another application.

Code Listing 3: Using NV_CONTROL-X Extension to Query Video

Output Capabilities

If (!XNVCTRLQueryAttribute(dpy, screen, 0,

NV_CTRL_GVO_SUPPORTED, &value)) {

return FALSE;

} else {

return TRUE;

}

4.3 OPENING THE VIDEO DEVICE

Once the availability of a SDI video output device has been confirmed, the next step is to

open the video device by calling

NvAPI_VIO_Open(). This is demonstrated in Code

Listing 4. In this example,

NVVIOCLASS_SDI indicates that the device is an SDI device

while

NVVIOOWNERTYPE_APPLICATION indicates that the device will be controlled by an

application rather than the desktop or NVIDIA control panel.

Code Listing 4: Opening the Video Device

// Open the video output device.

if (NvAPI_VIO_Open(m_vioHandle, NVVIOCLASS_SDI,

NVVIOOWNERTYPE_APPLICATION) != NVAPI_OK) {

MessageBox(NULL, "Cannot open SDI output device.", "Error",

MB_OK);

return E_FAIL;

}

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SDI Technologies iH30 Spezifikationen Seite 12