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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>snd_ctl_make_virtual_master</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="The ALSA Driver API" /><link rel="up" href="ch03s03.html" title="Virtual Master Control API" /><link rel="prev" href="ch03s03.html" title="Virtual Master Control API" /><link rel="next" href="re93.html" title="snd_ctl_add_slave" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>snd_ctl_make_virtual_master</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch03s03.html">Prev</a> </td><th width="60%" align="center">Virtual Master Control API</th><td width="20%" align="right"> <a accesskey="n" href="re93.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="snd_ctl_make_virtual_master"><a id="API-snd-ctl-make-virtual-master"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>snd_ctl_make_virtual_master —
Create a virtual master control
</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">struct snd_kcontrol * <b class="fsfunc">snd_ctl_make_virtual_master </b>(</code></td><td>char * <var class="pdparam">name</var>, </td></tr><tr><td> </td><td>const unsigned int * <var class="pdparam">tlv</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2716667"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>name</code></em></span></dt><dd><p>
name string of the control element to create
</p></dd><dt><span class="term"><em class="parameter"><code>tlv</code></em></span></dt><dd><p>
optional TLV int array for dB information
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2716711"></a><h2>Description</h2><p>
Creates a virtual matster control with the given name string.
Returns the created control element, or NULL for errors (ENOMEM).
</p><p>
After creating a vmaster element, you can add the slave controls
via <code class="function">snd_ctl_add_slave</code> or <code class="function">snd_ctl_add_slave_uncached</code>.
</p><p>
The optional argument <em class="parameter"><code>tlv</code></em> can be used to specify the TLV information
for dB scale of the master control. It should be a single element
with #SNDRV_CTL_TLVT_DB_SCALE, #SNDRV_CTL_TLV_DB_MINMAX or
#SNDRV_CTL_TLVT_DB_MINMAX_MUTE type, and should be the max 0dB.
</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch03s03.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch03s03.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re93.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Virtual Master Control API </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span>snd_ctl_add_slave</span></td></tr></table></div></body></html>
