testcases/kernel/device-drivers/v4l/user_space/doc/spec/r9539.htm - platform/external/ltp - Gitiles

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 ></A
 >ioctl VIDIOC_G_AUDIO, VIDIOC_S_AUDIO</H1
 ><DIV
 CLASS="REFNAMEDIV"
 ><A
 NAME="AEN9543"
 ></A
 ><H2
 >Name</H2
 >VIDIOC_G_AUDIO, VIDIOC_S_AUDIO&nbsp;--&nbsp;Query or select the current audio input and its
 attributes</DIV
 ><DIV
 CLASS="REFSYNOPSISDIV"
 ><A
 NAME="AEN9547"
 ></A
 ><H2
 >Synopsis</H2
 ><DIV
 CLASS="FUNCSYNOPSIS"
 ><P
 ></P
 ><A
 NAME="AEN9548"
 ></A
 ><P
 ><CODE
 ><CODE
 CLASS="FUNCDEF"
 >int ioctl</CODE
 >(int fd, int request, struct v4l2_audio *argp);</CODE
 ></P
 ><P
 ></P
 ></DIV
 ><DIV
 CLASS="FUNCSYNOPSIS"
 ><P
 ></P
 ><A
 NAME="AEN9558"
 ></A
 ><P
 ><CODE
 ><CODE
 CLASS="FUNCDEF"
 >int ioctl</CODE
 >(int fd, int request, const struct v4l2_audio *argp);</CODE
 ></P
 ><P
 ></P
 ></DIV
 ></DIV
 ><DIV
 CLASS="REFSECT1"
 ><A
 NAME="AEN9568"
 ></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_AUDIO, VIDIOC_S_AUDIO</P
 ></DD
 ><DT
 ><CODE
 CLASS="PARAMETER"
 >argp</CODE
 ></DT
 ><DD
 ><P
 ></P
 ></DD
 ></DL
 ></DIV
 ></DIV
 ><DIV
 CLASS="REFSECT1"
 ><A
 NAME="AEN9588"
 ></A
 ><H2
 >Description</H2
 ><P
 >To query the current audio input applications zero out the
 <CODE
 CLASS="STRUCTFIELD"
 >reserved</CODE
 > array of a struct&nbsp;<A
 HREF="r9539.htm#V4L2-AUDIO"
 >v4l2_audio</A
 >
 and call the <CODE
 CLASS="CONSTANT"
 >VIDIOC_G_AUDIO</CODE
 > ioctl with a pointer
 to this structure. Drivers fill the rest of the structure or return an
 <SPAN
 CLASS="ERRORCODE"
 >EINVAL</SPAN
 > error code when the device has no audio inputs, or none which combine
 with the current video input.</P
 ><P
 >Audio inputs have one writable property, the audio mode. To
 select the current audio input <SPAN
 CLASS="emphasis"
 ><I
 CLASS="EMPHASIS"
 >and</I
 ></SPAN
 > change the
 audio mode, applications initialize the
 <CODE
 CLASS="STRUCTFIELD"
 >index</CODE
 > and <CODE
 CLASS="STRUCTFIELD"
 >mode</CODE
 >
 fields, and the
 <CODE
 CLASS="STRUCTFIELD"
 >reserved</CODE
 > array of a
 <CODE
 CLASS="STRUCTNAME"
 >v4l2_audio</CODE
 > structure and call the
 <CODE
 CLASS="CONSTANT"
 >VIDIOC_S_AUDIO</CODE
 > ioctl. Drivers may switch to a
 different audio mode if the request cannot be satisfied. However, this
 is a write-only ioctl, it does not return the actual new audio
 mode.</P
 ><DIV
 CLASS="TABLE"
 ><A
 NAME="V4L2-AUDIO"
 ></A
 ><P
 ><B
 >Table 1. struct <CODE
 CLASS="STRUCTNAME"
 >v4l2_audio</CODE
 ></B
 ></P
 ><TABLE
 BORDER="0"
 FRAME="void"
 WIDTH="100%"
 CLASS="CALSTABLE"
 ><COL
 WIDTH="25%"
 TITLE="C1"><COL
 WIDTH="25%"
 TITLE="C2"><COL
 WIDTH="50%"
 TITLE="C3"><TBODY
 VALIGN="TOP"
 ><TR
 ><TD
 >__u32</TD
 ><TD
 ><CODE
 CLASS="STRUCTFIELD"
 >index</CODE
 ></TD
 ><TD
 >Identifies the audio input, set by the
 driver or application.</TD
 ></TR
 ><TR
 ><TD
 >__u8</TD
 ><TD
 ><CODE
 CLASS="STRUCTFIELD"
 >name</CODE
 >[32]</TD
 ><TD
 >Name of the audio input, a NUL-terminated ASCII
 string, for example: "Line In". This information is intended for the
 user, preferably the connector label on the device itself.</TD
 ></TR
 ><TR
 ><TD
 >__u32</TD
 ><TD
 ><CODE
 CLASS="STRUCTFIELD"
 >capability</CODE
 ></TD
 ><TD
 >Audio capability flags, see <A
 HREF="r9539.htm#AUDIO-CAPABILITY"
 >Table 2</A
 >.</TD
 ></TR
 ><TR
 ><TD
 >__u32</TD
 ><TD
 ><CODE
 CLASS="STRUCTFIELD"
 >mode</CODE
 ></TD
 ><TD
 >Audio mode flags set by drivers and applications (on
             <CODE
 CLASS="CONSTANT"
 >VIDIOC_S_AUDIO</CODE
 > ioctl), see <A
 HREF="r9539.htm#AUDIO-MODE"
 >Table 3</A
 >.</TD
 ></TR
 ><TR
 ><TD
 >__u32</TD
 ><TD
 ><CODE
 CLASS="STRUCTFIELD"
 >reserved</CODE
 >[2]</TD
 ><TD
 >Reserved for future extensions. Drivers and
 applications must set the array to zero.</TD
 ></TR
 ></TBODY
 ></TABLE
 ></DIV
 ><DIV
 CLASS="TABLE"
 ><A
 NAME="AUDIO-CAPABILITY"
 ></A
 ><P
 ><B
 >Table 2. Audio Capability Flags</B
 ></P
 ><TABLE
 BORDER="0"
 FRAME="void"
 WIDTH="100%"
 CLASS="CALSTABLE"
 ><COL
 WIDTH="38%"
 TITLE="C1"><COL
 WIDTH="12%"
 TITLE="C2"><COL
 WIDTH="50%"
 TITLE="C3"><TBODY
 VALIGN="TOP"
 ><TR
 ><TD
 ><CODE
 CLASS="CONSTANT"
 >V4L2_AUDCAP_STEREO</CODE
 ></TD
 ><TD
 >0x00001</TD
 ><TD
 >This is a stereo input. The flag is intended to
 automatically disable stereo recording etc. when the signal is always
 monaural. The API provides no means to detect if stereo is
 <SPAN
 CLASS="emphasis"
 ><I
 CLASS="EMPHASIS"
 >received</I
 ></SPAN
 >, unless the audio input belongs to a
 tuner.</TD
 ></TR
 ><TR
 ><TD
 ><CODE
 CLASS="CONSTANT"
 >V4L2_AUDCAP_AVL</CODE
 ></TD
 ><TD
 >0x00002</TD
 ><TD
 >Automatic Volume Level mode is supported.</TD
 ></TR
 ></TBODY
 ></TABLE
 ></DIV
 ><DIV
 CLASS="TABLE"
 ><A
 NAME="AUDIO-MODE"
 ></A
 ><P
 ><B
 >Table 3. Audio Mode Flags</B
 ></P
 ><TABLE
 BORDER="0"
 FRAME="void"
 WIDTH="100%"
 CLASS="CALSTABLE"
 ><COL
 WIDTH="38%"
 TITLE="C1"><COL
 WIDTH="12%"
 TITLE="C2"><COL
 WIDTH="50%"
 TITLE="C3"><TBODY
 VALIGN="TOP"
 ><TR
 ><TD
 ><CODE
 CLASS="CONSTANT"
 >V4L2_AUDMODE_AVL</CODE
 ></TD
 ><TD
 >0x00001</TD
 ><TD
 >AVL mode is on.</TD
 ></TR
 ></TBODY
 ></TABLE
 ></DIV
 ></DIV
 ><DIV
 CLASS="REFSECT1"
 ><A
 NAME="AEN9671"
 ></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
 >No audio inputs combine with the current video input,
 or the number of the selected audio input is out of bounds or it does
 not combine, or there are no audio inputs at all and the ioctl is not
 supported.</P
 ></DD
 ><DT
 ><SPAN
 CLASS="ERRORCODE"
 >EBUSY</SPAN
 ></DT
 ><DD
 ><P
 >I/O is in progress, the input cannot be
 switched.</P
 ></DD
 ></DL
 ></DIV
 ></DIV
 ><DIV
 CLASS="NAVFOOTER"
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 ALIGN="LEFT"
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	><A
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	><H1
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	></A
	>ioctl VIDIOC_G_AUDIO, VIDIOC_S_AUDIO</H1
	><DIV
	CLASS="REFNAMEDIV"
	><A
	NAME="AEN9543"
	></A
	><H2
	>Name</H2
	>VIDIOC_G_AUDIO, VIDIOC_S_AUDIO -- Query or select the current audio input and its
	attributes</DIV
	><DIV
	CLASS="REFSYNOPSISDIV"
	><A
	NAME="AEN9547"
	></A
	><H2
	>Synopsis</H2
	><DIV
	CLASS="FUNCSYNOPSIS"
	><P
	></P
	><A
	NAME="AEN9548"
	></A
	><P
	><CODE
	><CODE
	CLASS="FUNCDEF"
	>int ioctl</CODE
	>(int fd, int request, struct v4l2_audio *argp);</CODE
	></P
	><P
	></P
	></DIV
	><DIV
	CLASS="FUNCSYNOPSIS"
	><P
	></P
	><A
	NAME="AEN9558"
	></A
	><P
	><CODE
	><CODE
	CLASS="FUNCDEF"
	>int ioctl</CODE
	>(int fd, int request, const struct v4l2_audio *argp);</CODE
	></P
	><P
	></P
	></DIV
	></DIV
	><DIV
	CLASS="REFSECT1"
	><A
	NAME="AEN9568"
	></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_AUDIO, VIDIOC_S_AUDIO</P
	></DD
	><DT
	><CODE
	CLASS="PARAMETER"
	>argp</CODE
	></DT
	><DD
	><P
	></P
	></DD
	></DL
	></DIV
	></DIV
	><DIV
	CLASS="REFSECT1"
	><A
	NAME="AEN9588"
	></A
	><H2
	>Description</H2
	><P
	>To query the current audio input applications zero out the
	<CODE
	CLASS="STRUCTFIELD"
	>reserved</CODE
	> array of a struct <A
	HREF="r9539.htm#V4L2-AUDIO"
	>v4l2_audio</A
	>
	and call the <CODE
	CLASS="CONSTANT"
	>VIDIOC_G_AUDIO</CODE
	> ioctl with a pointer
	to this structure. Drivers fill the rest of the structure or return an
	<SPAN
	CLASS="ERRORCODE"
	>EINVAL</SPAN
	> error code when the device has no audio inputs, or none which combine
	with the current video input.</P
	><P
	>Audio inputs have one writable property, the audio mode. To
	select the current audio input <SPAN
	CLASS="emphasis"
	><I
	CLASS="EMPHASIS"
	>and</I
	></SPAN
	> change the
	audio mode, applications initialize the
	<CODE
	CLASS="STRUCTFIELD"
	>index</CODE
	> and <CODE
	CLASS="STRUCTFIELD"
	>mode</CODE
	>
	fields, and the
	<CODE
	CLASS="STRUCTFIELD"
	>reserved</CODE
	> array of a
	<CODE
	CLASS="STRUCTNAME"
	>v4l2_audio</CODE
	> structure and call the
	<CODE
	CLASS="CONSTANT"
	>VIDIOC_S_AUDIO</CODE
	> ioctl. Drivers may switch to a
	different audio mode if the request cannot be satisfied. However, this
	is a write-only ioctl, it does not return the actual new audio
	mode.</P
	><DIV
	CLASS="TABLE"
	><A
	NAME="V4L2-AUDIO"
	></A
	><P
	><B
	>Table 1. struct <CODE
	CLASS="STRUCTNAME"
	>v4l2_audio</CODE
	></B
	></P
	><TABLE
	BORDER="0"
	FRAME="void"
	WIDTH="100%"
	CLASS="CALSTABLE"
	><COL
	WIDTH="25%"
	TITLE="C1"><COL
	WIDTH="25%"
	TITLE="C2"><COL
	WIDTH="50%"
	TITLE="C3"><TBODY
	VALIGN="TOP"
	><TR
	><TD
	>__u32</TD
	><TD
	><CODE
	CLASS="STRUCTFIELD"
	>index</CODE
	></TD
	><TD
	>Identifies the audio input, set by the
	driver or application.</TD
	></TR
	><TR
	><TD
	>__u8</TD
	><TD
	><CODE
	CLASS="STRUCTFIELD"
	>name</CODE
	>[32]</TD
	><TD
	>Name of the audio input, a NUL-terminated ASCII
	string, for example: "Line In". This information is intended for the
	user, preferably the connector label on the device itself.</TD
	></TR
	><TR
	><TD
	>__u32</TD
	><TD
	><CODE
	CLASS="STRUCTFIELD"
	>capability</CODE
	></TD
	><TD
	>Audio capability flags, see <A
	HREF="r9539.htm#AUDIO-CAPABILITY"
	>Table 2</A
	>.</TD
	></TR
	><TR
	><TD
	>__u32</TD
	><TD
	><CODE
	CLASS="STRUCTFIELD"
	>mode</CODE
	></TD
	><TD
	>Audio mode flags set by drivers and applications (on
	<CODE
	CLASS="CONSTANT"
	>VIDIOC_S_AUDIO</CODE
	> ioctl), see <A
	HREF="r9539.htm#AUDIO-MODE"
	>Table 3</A
	>.</TD
	></TR
	><TR
	><TD
	>__u32</TD
	><TD
	><CODE
	CLASS="STRUCTFIELD"
	>reserved</CODE
	>[2]</TD
	><TD
	>Reserved for future extensions. Drivers and
	applications must set the array to zero.</TD
	></TR
	></TBODY
	></TABLE
	></DIV
	><DIV
	CLASS="TABLE"
	><A
	NAME="AUDIO-CAPABILITY"
	></A
	><P
	><B
	>Table 2. Audio Capability Flags</B
	></P
	><TABLE
	BORDER="0"
	FRAME="void"
	WIDTH="100%"
	CLASS="CALSTABLE"
	><COL
	WIDTH="38%"
	TITLE="C1"><COL
	WIDTH="12%"
	TITLE="C2"><COL
	WIDTH="50%"
	TITLE="C3"><TBODY
	VALIGN="TOP"
	><TR
	><TD
	><CODE
	CLASS="CONSTANT"
	>V4L2_AUDCAP_STEREO</CODE
	></TD
	><TD
	>0x00001</TD
	><TD
	>This is a stereo input. The flag is intended to
	automatically disable stereo recording etc. when the signal is always
	monaural. The API provides no means to detect if stereo is
	<SPAN
	CLASS="emphasis"
	><I
	CLASS="EMPHASIS"
	>received</I
	></SPAN
	>, unless the audio input belongs to a
	tuner.</TD
	></TR
	><TR
	><TD
	><CODE
	CLASS="CONSTANT"
	>V4L2_AUDCAP_AVL</CODE
	></TD
	><TD
	>0x00002</TD
	><TD
	>Automatic Volume Level mode is supported.</TD
	></TR
	></TBODY
	></TABLE
	></DIV
	><DIV
	CLASS="TABLE"
	><A
	NAME="AUDIO-MODE"
	></A
	><P
	><B
	>Table 3. Audio Mode Flags</B
	></P
	><TABLE
	BORDER="0"
	FRAME="void"
	WIDTH="100%"
	CLASS="CALSTABLE"
	><COL
	WIDTH="38%"
	TITLE="C1"><COL
	WIDTH="12%"
	TITLE="C2"><COL
	WIDTH="50%"
	TITLE="C3"><TBODY
	VALIGN="TOP"
	><TR
	><TD
	><CODE
	CLASS="CONSTANT"
	>V4L2_AUDMODE_AVL</CODE
	></TD
	><TD
	>0x00001</TD
	><TD
	>AVL mode is on.</TD
	></TR
	></TBODY
	></TABLE
	></DIV
	></DIV
	><DIV
	CLASS="REFSECT1"
	><A
	NAME="AEN9671"
	></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
	>No audio inputs combine with the current video input,
	or the number of the selected audio input is out of bounds or it does
	not combine, or there are no audio inputs at all and the ioctl is not
	supported.</P
	></DD
	><DT
	><SPAN
	CLASS="ERRORCODE"
	>EBUSY</SPAN
	></DT
	><DD
	><P
	>I/O is in progress, the input cannot be
	switched.</P
	></DD
	></DL
	></DIV
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	></BODY
	></HTML
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