Nvidia 4500 User Manual

NVIDIA Corporation

Quadro FX 4500/5500 SDI User’s Guide – Version 2.0 

C

HAPTER

 5

API Control

If, rather than using the GLX_NV_video_out extension to display GLX pbuffers on 
the GVO output, you wish display the X screen on the GVO output, set 

NV_CTRL_GVO_DISPLAY_X_SCREEN_ENABLE.

•  Setting most GVO attributes only causes the value to be cached in the X server.  

The values will be flushed to the hardware either when 

 is enabled, or when a GLX pbuffer is bound to 

the GVO output (with glXBindVideoImageNV()).

• GLX_NV_video_out and 

 are mutually 

exclusive. 

If 

 is enabled, then glXGetVideoDeviceNV will 

fail.  Similarly, if a GLX client has locked the GVO output (via glXGetVideoDeviceNV), 
then 

 will fail.  The 

 

event will be sent when a GLX client locks the GVO output.

NV_CTRL_GVO Attributes

NV_CTRL_GVO_SUPPORTED

/*
 * NV_CTRL_GVO_SUPPORTED - returns whether this X screen supports GVO;
 * if this screen does not support GVO output, then all other GVO
 * attributes are unavailable.
 */

#define NV_CTRL_GVO_SUPPORTED                                   67  /* R-- */
#define NV_CTRL_GVO_SUPPORTED_FALSE                             0
#define NV_CTRL_GVO_SUPPORTED_TRUE                              1

NV_CTRL_GVO_SYNC_MODE

/*
 * NV_CTRL_GVO_SYNC_MODE - selects the GVO sync mode; possible values
 * are:
 *
 * FREE_RUNNING - GVO does not sync to any external signal
 *
 * GENLOCK - the GVO output is genlocked to an incoming sync signal;
 * genlocking locks at hsync.  This requires that the output video