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Advanced Topics

Quadro SDI Output PG-03776-001_v06 | 54

Code Listing 40: Configuring the SDI Device to Output Two

Independent Video Channels

l_gvoConfig.dataFormat=

NVGVODATAFORMAT_DUAL_R8G8B8_TO_DUAL_YCRCB422;

Once configured, an application must utilize separate render targets for each video

channel. The application draw loop would then bind and update each render target in

turn prior to utilizing

glPresentFrameDualFillNV()to send the rendered data to the

SDI device as demonstrated in Code Listing 41.

Code Listing 41: Sending Two Independent Video Channels

gFBO1.bind(gWidth, gHeight);

drawChannel1();

gFBO1.unbind();

gFBO2.bind(gWidth, gHeight);

drawChannel2();

gFBO2.unbind();

glPresentFrameDualFillNV(1, 0, 0, 0, GL_FRAME_NV,

GL_RENDERBUFFER_EXT, gFBO1.renderbufferIds[0],

GL_NONE, 0,

GL_RENDERBUFFER_EXT, gFBO2.renderbufferIds[0],

GL_NONE, 0);

10.2 SENDING THE DESKTOP TO VIDEO OUTPUT

In addition to sending the contents of one or more pbuffers, buffer objects or textures as

video output data, the desktop, or a region of the desktop can be displayed on the SDI

video output from within an application. This mode of operation permits an application

to control the Quadro SDI output in much the same was as the control panel.

The programming of this operating mode is similar as that described in Chapter 4 except

that this usage model requires the specification of

NVVIOOWNERTYPE_DESKTOP to

NvAPI_VIO_Open(). Once the desktop is opened, the video output device is configured

similarly to the buffer object case as outlined in code sample 4 except that in the desktop

case, an application can initialize the

NVGVOOUTPUTREGION structure to define the region of

the desktop area that will be visible on the video output. Initialization of the Quadro SDI

for desktop output to video from within an application is outlined in Code Listing 42.

This example sends a 1280 × 720 rectangular area of the desktop with the top left corner

at location (gX, gY) to the Quadro SDI output as 720p5994 SDI video output.

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SDI Technologies iH30 Especificações Página 59