<?xml version="1.0" encoding="ANSI_X3.4-1968" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>ioctl VIDIOC_G_DV_PRESET, VIDIOC_S_DV_PRESET</title><meta name="generator" content="DocBook XSL Stylesheets V1.76.1" /><link rel="home" href="index.html" title="LINUX MEDIA INFRASTRUCTURE API" /><link rel="up" href="user-func.html" title="Appendix A. Function Reference" /><link rel="prev" href="vidioc-g-ctrl.html" title="ioctl VIDIOC_G_CTRL, VIDIOC_S_CTRL" /><link rel="next" href="vidioc-g-dv-timings.html" title="ioctl VIDIOC_G_DV_TIMINGS, VIDIOC_S_DV_TIMINGS" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">ioctl VIDIOC_G_DV_PRESET, VIDIOC_S_DV_PRESET</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="vidioc-g-ctrl.html">Prev</a> </td><th width="60%" align="center">Appendix A. Function Reference</th><td width="20%" align="right"> <a accesskey="n" href="vidioc-g-dv-timings.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="ioctl VIDIOC_G_DV_PRESET, VIDIOC_S_DV_PRESET"><a id="vidioc-g-dv-preset"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>VIDIOC_G_DV_PRESET, VIDIOC_S_DV_PRESET — Query or select the DV preset of the current input or output</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" class="funcprototype-table"><tr><td><code class="funcdef">int <strong>fsfuncioctl</strong>(</code></td><td>int <var class="pdparam">fd</var>, </td></tr><tr><td> </td><td>int <var class="pdparam">request</var>, </td></tr><tr><td> </td><td>struct v4l2_dv_preset *<var class="pdparam">argp</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id3158836"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>fd</code></em></span></dt><dd><p>File descriptor returned by <a class="link" href="func-open.html" title="V4L2 open()"><code class="function">open()</code></a>.</p></dd><dt><span class="term"><em class="parameter"><code>request</code></em></span></dt><dd><p>VIDIOC_G_DV_PRESET, VIDIOC_S_DV_PRESET</p></dd><dt><span class="term"><em class="parameter"><code>argp</code></em></span></dt><dd><p></p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id3160015"></a><h2>Description</h2><p>To query and select the current DV preset, applications use the <code class="constant">VIDIOC_G_DV_PRESET</code> and <code class="constant">VIDIOC_S_DV_PRESET</code> ioctls which take a pointer to a struct <a class="link" href="vidioc-g-dv-preset.html#v4l2-dv-preset" title="Table A.42. struct v4l2_dv_preset">v4l2_dv_preset</a> type as argument. Applications must zero the reserved array in struct <a class="link" href="vidioc-g-dv-preset.html#v4l2-dv-preset" title="Table A.42. struct v4l2_dv_preset">v4l2_dv_preset</a>. <code class="constant">VIDIOC_G_DV_PRESET</code> returns a dv preset in the field <em class="structfield"><code>preset</code></em> of struct <a class="link" href="vidioc-g-dv-preset.html#v4l2-dv-preset" title="Table A.42. struct v4l2_dv_preset">v4l2_dv_preset</a>.</p><p><code class="constant">VIDIOC_S_DV_PRESET</code> accepts a pointer to a struct <a class="link" href="vidioc-g-dv-preset.html#v4l2-dv-preset" title="Table A.42. struct v4l2_dv_preset">v4l2_dv_preset</a> that has the preset value to be set. Applications must zero the reserved array in struct <a class="link" href="vidioc-g-dv-preset.html#v4l2-dv-preset" title="Table A.42. struct v4l2_dv_preset">v4l2_dv_preset</a>. If the preset is not supported, it returns an <span class="errorcode">EINVAL</span> error code </p></div><div class="refsect1" title="Return Value"><a id="id3160099"></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><div class="variablelist"><dl><dt><span class="term"><span class="errorcode">EINVAL</span></span></dt><dd><p>This ioctl is not supported, or the <code class="constant">VIDIOC_S_DV_PRESET</code>,<code class="constant">VIDIOC_S_DV_PRESET</code> parameter was unsuitable.</p></dd><dt><span class="term"><span class="errorcode">EBUSY</span></span></dt><dd><p>The device is busy and therefore can not change the preset.</p></dd></dl></div><div class="table"><a id="v4l2-dv-preset"></a><p class="title"><strong>Table A.42. struct <span class="structname">v4l2_dv_preset</span></strong></p><div class="table-contents"><table summary="struct v4l2_dv_preset" width="100%" border="0"><colgroup><col class="c1" /><col class="c2" /><col class="c3" /></colgroup><tbody valign="top"><tr><td valign="top">__u32</td><td valign="top"><em class="structfield"><code>preset</code></em></td><td valign="top">Preset value to represent the digital video timings</td></tr><tr><td valign="top">__u32</td><td valign="top"><em class="structfield"><code>reserved[4]</code></em></td><td valign="top">Reserved fields for future use</td></tr></tbody></table></div></div><br class="table-break" /></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="vidioc-g-ctrl.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="user-func.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="vidioc-g-dv-timings.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">ioctl VIDIOC_G_CTRL, VIDIOC_S_CTRL </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> ioctl VIDIOC_G_DV_TIMINGS, VIDIOC_S_DV_TIMINGS</td></tr></table></div></body></html>
