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| >Video for Linux Two API Specification: Revision 0.24</TH |
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| ><H1 |
| ><A |
| NAME="VIDIOC-G-STD" |
| ></A |
| >ioctl VIDIOC_G_STD, VIDIOC_S_STD</H1 |
| ><DIV |
| CLASS="REFNAMEDIV" |
| ><A |
| NAME="AEN12269" |
| ></A |
| ><H2 |
| >Name</H2 |
| >VIDIOC_G_STD, VIDIOC_S_STD -- Query or select the video standard of the current input</DIV |
| ><DIV |
| CLASS="REFSYNOPSISDIV" |
| ><A |
| NAME="AEN12273" |
| ></A |
| ><H2 |
| >Synopsis</H2 |
| ><DIV |
| CLASS="FUNCSYNOPSIS" |
| ><P |
| ></P |
| ><A |
| NAME="AEN12274" |
| ></A |
| ><P |
| ><CODE |
| ><CODE |
| CLASS="FUNCDEF" |
| >int ioctl</CODE |
| >(int fd, int request, v4l2_std_id |
| *argp);</CODE |
| ></P |
| ><P |
| ></P |
| ></DIV |
| ><DIV |
| CLASS="FUNCSYNOPSIS" |
| ><P |
| ></P |
| ><A |
| NAME="AEN12284" |
| ></A |
| ><P |
| ><CODE |
| ><CODE |
| CLASS="FUNCDEF" |
| >int ioctl</CODE |
| >(int fd, int request, const v4l2_std_id |
| *argp);</CODE |
| ></P |
| ><P |
| ></P |
| ></DIV |
| ></DIV |
| ><DIV |
| CLASS="REFSECT1" |
| ><A |
| NAME="AEN12294" |
| ></A |
| ><H2 |
| >Arguments</H2 |
| ><P |
| ></P |
| ><DIV |
| CLASS="VARIABLELIST" |
| ><DL |
| ><DT |
| ><CODE |
| CLASS="PARAMETER" |
| >fd</CODE |
| ></DT |
| ><DD |
| ><P |
| >File descriptor returned by <A |
| HREF="r14090.htm" |
| ><CODE |
| CLASS="FUNCTION" |
| >open()</CODE |
| ></A |
| >.</P |
| ></DD |
| ><DT |
| ><CODE |
| CLASS="PARAMETER" |
| >request</CODE |
| ></DT |
| ><DD |
| ><P |
| >VIDIOC_G_STD, VIDIOC_S_STD</P |
| ></DD |
| ><DT |
| ><CODE |
| CLASS="PARAMETER" |
| >argp</CODE |
| ></DT |
| ><DD |
| ><P |
| ></P |
| ></DD |
| ></DL |
| ></DIV |
| ></DIV |
| ><DIV |
| CLASS="REFSECT1" |
| ><A |
| NAME="AEN12314" |
| ></A |
| ><H2 |
| >Description</H2 |
| ><P |
| >To query and select the current video standard applications |
| use the <CODE |
| CLASS="CONSTANT" |
| >VIDIOC_G_STD</CODE |
| > and <CODE |
| CLASS="CONSTANT" |
| >VIDIOC_S_STD</CODE |
| > ioctls which take a pointer to a |
| <A |
| HREF="r9288.htm#V4L2-STD-ID" |
| >v4l2_std_id</A |
| > type as argument. <CODE |
| CLASS="CONSTANT" |
| >VIDIOC_G_STD</CODE |
| > can |
| return a single flag or a set of flags as in struct <A |
| HREF="r9288.htm#V4L2-STANDARD" |
| >v4l2_standard</A |
| > field |
| <CODE |
| CLASS="STRUCTFIELD" |
| >id</CODE |
| >. The flags must be unambiguous such |
| that they appear in only one enumerated <CODE |
| CLASS="STRUCTNAME" |
| >v4l2_standard</CODE |
| > structure.</P |
| ><P |
| ><CODE |
| CLASS="CONSTANT" |
| >VIDIOC_S_STD</CODE |
| > accepts one or more |
| flags, being a write-only ioctl it does not return the actual new standard as |
| <CODE |
| CLASS="CONSTANT" |
| >VIDIOC_G_STD</CODE |
| > does. When no flags are given or |
| the current input does not support the requested standard the driver |
| returns an <SPAN |
| CLASS="ERRORCODE" |
| >EINVAL</SPAN |
| > error code. When the standard set is ambiguous drivers may |
| return <SPAN |
| CLASS="ERRORCODE" |
| >EINVAL</SPAN |
| > or choose any of the requested |
| standards.</P |
| ></DIV |
| ><DIV |
| CLASS="REFSECT1" |
| ><A |
| NAME="AEN12329" |
| ></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 |
| ><P |
| ></P |
| ><DIV |
| CLASS="VARIABLELIST" |
| ><DL |
| ><DT |
| ><SPAN |
| CLASS="ERRORCODE" |
| >EINVAL</SPAN |
| ></DT |
| ><DD |
| ><P |
| >This ioctl is not supported, or the |
| <CODE |
| CLASS="CONSTANT" |
| >VIDIOC_S_STD</CODE |
| > parameter was unsuitable.</P |
| ></DD |
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