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Advanced Topics

Quadro SDI Output PG-03776-001_v06 | 55

Code Listing 42: Configuring Desktop Video Output

// Open the SDI device for desktop output

if (NvAPI_VIO_Open(hVIO, NVVIOCLASS_SDI, NVVIOOWNERTYPE_DESKTOP)

!= NVAPI_OK) {

return E_FAIL;

}

// Configure video output parameters

NVVIOCONFIG l_vioConfig;

memset(&l_vioConfig, 0, sizeof(l_vioConfig));

l_vioConfig.version = NVVIOCONFIG_VER;

l_vioConfig.fields = NVVIOCONFIG_SIGNALFORMAT |

NVVIOCONFIG_DATAFORMAT |

NVVIOCONFIG_OUTPUTREGION;

// Video output signal format

l_vioConfig.vioConfig.outConfig.signalFormat =

NVVIOSIGNALFORMAT_720P_5994_SMPTE274;

// Video output data format

l_vioConfig.vioConfig.outConfig.dataFormat =

NVVIODATAFORMAT_R8G8B8_TO_YCRCB422;

// Desktop region to output

NVVIOOUTPUTREGION l_vioOutputRegion;

l_vioOutputRegion.x = gX;

l_vioOutputRegion.y = gY;

l_vioOutputRegion.width = 1280;

l_vioOutputRegion.height = 720;

// Set configuration

if (NvAPI_VIO_SetConfig(hVIO, &l_vioConfig) != NVAPI_OK) {

return E_FAIL;

}

10.3 COLOR SPACE CONVERSION

The Quadro SDI automatically performs ITU Rec. 601 or 709 color space conversion

from RGB to YCrCb when required by the specified data format. This color space

conversion is performed according to the following formula:

Y = offset

Y + scaleY * (ry*R + gy*G + by*B)

Cb = offset

cb + scalecb * (rcb*R + gcb*G + bcb *B)

Cr = offset

cr + scalecr * (rcr*R + gcr*G + bcr*B)

where scale controls the magnitude of the resulting output range and offset controls the

position of the result within that range. These values should be within -1.0 and 1.0.

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