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Data Transfer

Quadro SDI Output PG-03776-001_v06 | 27

Table 5-2. Pbuffer Size = Frame

iBufferType Pbuffer Size = Frame

WGL_VIDEO_OUT_FIELD_1 Even lines to Field 0

WGL_VIDEO_OUT_FIELD_2 Odd lines to Field 1

WGL_VIDEO_OUT_FRAME Full frame

WGL_VIDEO_OUT_STACKED_FIELDS_1_2 Upper half to Field 2

Bottom half to Field 1

WGL_VIDEO_OUT_STACKED_FIELDS_2_1 Upper half to Field 1

Bottom half to Field 2

The parameter pulCounterPbuffer returns the count of the pbuffer sent. This value

should always increment and can be used to calculate if frames or fields have been

dropped or duplicated as described in Section 8.1.1. The value of

bBlock indicates if the

function should queue the pbuffer and return immediately or wait until the pbuffer is

actually scanned out by the SDI device. The following example sends a frame of

graphics data to the video device.

Code Listing 23: Sending a Frame of Data to the Video Device

if ((wglSendPbufferToVideoNV(hpBuf, WGL_VIDEO_OUT_FRAME,

&gBufCount, TRUE) != GL_NOERROR) {

// Handle error.

}

In this example, the fourth argument to wglSendPbufferToVideoNV() is set to TRUE to

indicate that this function call should block until video scan out of this frame is

complete. This aids in the synchronization of graphics and video in applications that

utilize only a single pbuffer.

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Note: Color data in an 8-bit pbuffer should be integer data in the range of 1 to 256

while data placed by an application into a 16-bit floating point pbuffer should be

16-bit float data in the range of 0 to 1.

On Linux, the procedure of sending a pbuffer containing a field or frame to the video

output is identical to that for Windows except for the function used. On Linux, the

function

glXSendPbufferToVideoNV() is utilized as illustrated in the following

example.

int glXSendPbufferToVideoNV(Display *dpy, GLXPbuffer pbuf,

int iBufferType,

unsigned long *pulCounterPbuffer,

GLboolean bBlock);

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