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| >Video for Linux Two API Specification: Revision 0.24</TH |
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| >ioctl VIDIOC_OVERLAY</H1 |
| ><DIV |
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| ><A |
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| ></A |
| ><H2 |
| >Name</H2 |
| >VIDIOC_OVERLAY -- Start or stop video overlay</DIV |
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| NAME="AEN12823" |
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| >Synopsis</H2 |
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| ><CODE |
| ><CODE |
| CLASS="FUNCDEF" |
| >int ioctl</CODE |
| >(int fd, int request, const int *argp);</CODE |
| ></P |
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| >Arguments</H2 |
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| ><CODE |
| CLASS="PARAMETER" |
| >fd</CODE |
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| >File descriptor returned by <A |
| HREF="r14090.htm" |
| ><CODE |
| CLASS="FUNCTION" |
| >open()</CODE |
| ></A |
| >.</P |
| ></DD |
| ><DT |
| ><CODE |
| CLASS="PARAMETER" |
| >request</CODE |
| ></DT |
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| >VIDIOC_OVERLAY</P |
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| ><DT |
| ><CODE |
| CLASS="PARAMETER" |
| >argp</CODE |
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| NAME="AEN12854" |
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| ><H2 |
| >Description</H2 |
| ><P |
| >This ioctl is part of the <A |
| HREF="x6570.htm" |
| >video |
| overlay</A |
| > I/O method. Applications call |
| <CODE |
| CLASS="CONSTANT" |
| >VIDIOC_OVERLAY</CODE |
| > to start or stop the |
| overlay. It takes a pointer to an integer which must be set to |
| zero by the application to stop overlay, to one to start.</P |
| ><P |
| >Drivers do not support <A |
| HREF="r13817.htm" |
| ><CODE |
| CLASS="CONSTANT" |
| >VIDIOC_STREAMON</CODE |
| ></A |
| > or |
| <A |
| HREF="r13817.htm" |
| ><CODE |
| CLASS="CONSTANT" |
| >VIDIOC_STREAMOFF</CODE |
| ></A |
| > with <CODE |
| CLASS="CONSTANT" |
| >V4L2_BUF_TYPE_VIDEO_OVERLAY</CODE |
| >.</P |
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| NAME="AEN12865" |
| ></A |
| ><H2 |
| >Return Value</H2 |
| ><P |
| >On success <SPAN |
| CLASS="RETURNVALUE" |
| >0</SPAN |
| > is returned, on error <SPAN |
| CLASS="RETURNVALUE" |
| >-1</SPAN |
| > and the <CODE |
| CLASS="VARNAME" |
| >errno</CODE |
| > variable is set appropriately:</P |
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| >EINVAL</SPAN |
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| ><DD |
| ><P |
| >Video overlay is not supported, or the |
| parameters have not been set up. See <A |
| HREF="x6570.htm" |
| >Section 4.2</A |
| > for the necessary steps.</P |
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