SDI Technologies iH30 Spezifikationen PDF herunterladen (Seite 57)

Device Feedback

Quadro SDI Output PG-03776-001_v06 | 52

l_bField1 = l_bField1 ? 0 : 1;

l_bBlock = options.block; //l_bField1 ? FALSE : TRUE;

l_iVsyncDiff = 1;

}

} else {

l_iBufType = WGL_VIDEO_OUT_FRAME;

l_iVsyncDiff = 2;

l_bBlock = options.block;

}

wglSendPbufferToVideoNV(hpBuf, l_iBufType, &gBufCount, l_bBlock);

if ((l_ulNumVertBlanks != l_ulLastNumVertBlanks) &&

(l_ulNumVertBlanks != (l_ulLastNumVertBlanks +

l_iVsyncDiff)))

fprintf(stderr, "Warning:Dropped/Duplicate Frame\n");

l_ulLastNumVertBlanks = l_ulNumVertBlanks;

When in the case of a progressive video format, or when rendering fields, the vsync

counter increments by more than one during subsequent execution of the draw loop,

then a vertical retrace was missed. When rendering frames in an interleaved video

format, if the vsync counter increments by more than two during subsequent execution

of the draw loop, then a vertical retrace was missed. Now, to know if a duplicated frame

or field is actually displayed on the SDI video output, this information must be used in

coordination with the number of queued buffers as determined in Code Listing 36.

9.2.2 Using the GL_present_video Extension

When an application uses the GL_NV_present_video extension, a query object is

utilized to determine if a frame is duplicated on the SDI output. This is demonstrated in

Code Listing 38.

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SDI Technologies iH30 Spezifikationen Seite 57