SDI Technologies iH30 Especificações descarregar pdf (Página 33)

Data Transfer

Quadro SDI Output PG-03776-001_v06 | 28

Code Listing 24: Sending a Frame of Data to the Linux Video Device

glXSendPbufferToVideoNV(dpy, pbuffer,

GLX_VIDEO_OUT_FRAME_NV,

&gBufCount, GL_FALSE);

5.7 STOPPING VIDEO TRANSFERS AND CLOSING

THE VIDEO DEVICE

On Windows, once an application has completed all video transfers and no longer needs

access to a video device, an application should stop sending and release any OpenGL

resources prior to closing the device with NVAPI. If the

WGL_video_out OpenGL

extension is in use, the pbuffer and video device should be released as shown in Code

Listing 25.

Code Listing 25: Releasing Bound OpenGL Resources

wglReleaseVideoImageNV(gPBuffer.getHandle(),

WGL_VIDEO_OUT_COLOR_AND_ALPHA_NV);

wglReleaseVideoDeviceNV(ghpDevList[0]);

In the case of the GL_present_video extension, no formal releasing of OpenGL

resources is required. However, in both cases, once the OpenGL resources are released,

then the video device can be stopped and closed as shown in Code Listing 26.

Code Listing 26: Closing the Video Device on Windows

if ( m_vioHandle ) {

NvAPI_VIO_Close(m_vioHandle);

}

On Linux there are no requirements within the CONTROL-X extension to stop video

transfers and close the device. However, one must unbind any associated pbuffers and

release the video device using the appropriate

GLX_NV_video_out functions, prior to

deleting the pbuffers. This is outlined Code Listing 27.

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SDI Technologies iH30 Especificações Página 33