NVIDIA FX5500 User Guide - Page 71

Nv_ctrl_gvo Attributes, Nv_ctrl_gvo_supported, Nv_ctrl_gvo_sync_mode

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CHAPTER 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 to 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 NV_CTRL_GVO_DISPLAY_X_SCREEN is enabled, or when a GLX pbuffer is bound to the GVO output (with glXBindVideoImageNV()). • GLX_NV_video_out and NV_CTRL_GVO_DISPLAY_X_SCREEN are mutually exclusive. If NV_CTRL_GVO_DISPLAY_X_SCREEN is enabled, then glXGetVideoDeviceNV will fail. Similarly, if a GLX client has locked the GVO output (via glXGetVideoDeviceNV), then NV_CTRL_GVO_DISPLAY_X_SCREEN will fail. The NV_CTRL_GVO_LOCKED 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 #define NV_CTRL_GVO_SUPPORTED_FALSE #define NV_CTRL_GVO_SUPPORTED_TRUE 67 /* R-- */ 0 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 NVIDIA Corporation Quadro FX 4500/5500 SDI User's Guide - Version 2.0 67

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NVIDIA Corporation
Quadro FX 4500/5500 SDI User’s Guide
– Version 2.0
67
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
to
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
NV_CTRL_GVO_DISPLAY_X_SCREEN
is enabled, or when a GLX pbuffer is bound to
the GVO output (with glXBindVideoImageNV()).
•
GLX_NV_video_out and
NV_CTRL_GVO_DISPLAY_X_SCREEN
are mutually
exclusive.
If
NV_CTRL_GVO_DISPLAY_X_SCREEN
is enabled, then glXGetVideoDeviceNV will
fail.
Similarly, if a GLX client has locked the GVO output (via glXGetVideoDeviceNV),
then
NV_CTRL_GVO_DISPLAY_X_SCREEN
will fail.
The
NV_CTRL_GVO_LOCKED
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