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<title>ALSA project - the C library reference: snd_ctl_ext Struct Reference</title>
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<h1>snd_ctl_ext Struct Reference<br>
<small>
[<a class="el" href="group___ctl_plugin___s_d_k.html">External Control Plugin SDK</a>]</small>
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<tr><td colspan="2"><br><h2>Data Fields</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="structsnd__ctl__ext.html#9f9f36662a358d6d36a18456189f020f">version</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structsnd__ctl__ext.html#61ffb4105075ed547c83060c19e9a084">card_idx</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char </td><td class="memItemRight" valign="bottom"><a class="el" href="structsnd__ctl__ext.html#571c06d53c2de808952e133232039319">id</a> [16]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char </td><td class="memItemRight" valign="bottom"><a class="el" href="structsnd__ctl__ext.html#68bc59210568eef8c843ca05018442c9">driver</a> [16]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char </td><td class="memItemRight" valign="bottom"><a class="el" href="structsnd__ctl__ext.html#621d5b59099e3157b5dc46012be944c2">name</a> [32]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char </td><td class="memItemRight" valign="bottom"><a class="el" href="structsnd__ctl__ext.html#0a19b3529856dba3f242e45f8c46a0e7">longname</a> [80]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char </td><td class="memItemRight" valign="bottom"><a class="el" href="structsnd__ctl__ext.html#29f9f7006cf565ff91ff97e9a2b38464">mixername</a> [80]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structsnd__ctl__ext.html#6d27c5299638b97c77820428fb148231">poll_fd</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">const <a class="el" href="structsnd__ctl__ext__callback.html">snd_ctl_ext_callback_t</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="structsnd__ctl__ext.html#b238f3fb0f203c0afcbf070caa159ce7">callback</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void * </td><td class="memItemRight" valign="bottom"><a class="el" href="structsnd__ctl__ext.html#596497214d8fc4ac2a57fc5fd58d44c8">private_data</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="group___control.html#g6fef7f4892f9960f41ead15ef8994aa0">snd_ctl_t</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="structsnd__ctl__ext.html#32b7be80fde9b1c21332b43f7ed14bbf">handle</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structsnd__ctl__ext.html#bd9522565f929b1edbf1ace70a6e4ba7">nonblock</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structsnd__ctl__ext.html#d41d520851a84adfb9b9410c5b2adef3">subscribed</a></td></tr>
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<hr><a name="_details"></a><h2>Detailed Description</h2>
Handle of control ext
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<hr><h2>Field Documentation</h2>
<a class="anchor" name="b238f3fb0f203c0afcbf070caa159ce7"></a><!-- doxytag: member="snd_ctl_ext::callback" ref="b238f3fb0f203c0afcbf070caa159ce7" args="" -->
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<td class="memname">const <a class="el" href="structsnd__ctl__ext__callback.html">snd_ctl_ext_callback_t</a>* <a class="el" href="structsnd__ctl__ext.html#b238f3fb0f203c0afcbf070caa159ce7">snd_ctl_ext::callback</a> </td>
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callbacks of this plugin; must be filled before calling <a class="el" href="group___p_c_m___i_o_plug.html#g49f570ce699bd75885756372459ff351">snd_pcm_ioplug_create()</a>
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<a class="anchor" name="61ffb4105075ed547c83060c19e9a084"></a><!-- doxytag: member="snd_ctl_ext::card_idx" ref="61ffb4105075ed547c83060c19e9a084" args="" -->
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<td class="memname">int <a class="el" href="structsnd__ctl__ext.html#61ffb4105075ed547c83060c19e9a084">snd_ctl_ext::card_idx</a> </td>
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Index of this card; must be filled before calling <a class="el" href="group___ctl_plugin___s_d_k.html#gec4dfef098c1535fc68de820a45999be">snd_ctl_ext_create()</a>
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<a class="anchor" name="68bc59210568eef8c843ca05018442c9"></a><!-- doxytag: member="snd_ctl_ext::driver" ref="68bc59210568eef8c843ca05018442c9" args="[16]" -->
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<td class="memname">char <a class="el" href="structsnd__ctl__ext.html#68bc59210568eef8c843ca05018442c9">snd_ctl_ext::driver</a>[16] </td>
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Driver name of this card; must be filled before calling <a class="el" href="group___ctl_plugin___s_d_k.html#gec4dfef098c1535fc68de820a45999be">snd_ctl_ext_create()</a>
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<a class="anchor" name="32b7be80fde9b1c21332b43f7ed14bbf"></a><!-- doxytag: member="snd_ctl_ext::handle" ref="32b7be80fde9b1c21332b43f7ed14bbf" args="" -->
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<td class="memname"><a class="el" href="group___control.html#g6fef7f4892f9960f41ead15ef8994aa0">snd_ctl_t</a>* <a class="el" href="structsnd__ctl__ext.html#32b7be80fde9b1c21332b43f7ed14bbf">snd_ctl_ext::handle</a> </td>
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control handle filled by <a class="el" href="group___ctl_plugin___s_d_k.html#gec4dfef098c1535fc68de820a45999be">snd_ctl_ext_create()</a>
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<a class="anchor" name="571c06d53c2de808952e133232039319"></a><!-- doxytag: member="snd_ctl_ext::id" ref="571c06d53c2de808952e133232039319" args="[16]" -->
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<td class="memname">char <a class="el" href="structsnd__ctl__ext.html#571c06d53c2de808952e133232039319">snd_ctl_ext::id</a>[16] </td>
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ID string of this card; must be filled before calling <a class="el" href="group___ctl_plugin___s_d_k.html#gec4dfef098c1535fc68de820a45999be">snd_ctl_ext_create()</a>
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<a class="anchor" name="0a19b3529856dba3f242e45f8c46a0e7"></a><!-- doxytag: member="snd_ctl_ext::longname" ref="0a19b3529856dba3f242e45f8c46a0e7" args="[80]" -->
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<td class="memname">char <a class="el" href="structsnd__ctl__ext.html#0a19b3529856dba3f242e45f8c46a0e7">snd_ctl_ext::longname</a>[80] </td>
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Long name of this card; must be filled before calling <a class="el" href="group___ctl_plugin___s_d_k.html#gec4dfef098c1535fc68de820a45999be">snd_ctl_ext_create()</a>
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<a class="anchor" name="29f9f7006cf565ff91ff97e9a2b38464"></a><!-- doxytag: member="snd_ctl_ext::mixername" ref="29f9f7006cf565ff91ff97e9a2b38464" args="[80]" -->
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<td class="memname">char <a class="el" href="structsnd__ctl__ext.html#29f9f7006cf565ff91ff97e9a2b38464">snd_ctl_ext::mixername</a>[80] </td>
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Mixer name of this card; must be filled before calling <a class="el" href="group___ctl_plugin___s_d_k.html#gec4dfef098c1535fc68de820a45999be">snd_ctl_ext_create()</a>
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<a class="anchor" name="621d5b59099e3157b5dc46012be944c2"></a><!-- doxytag: member="snd_ctl_ext::name" ref="621d5b59099e3157b5dc46012be944c2" args="[32]" -->
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<td class="memname">char <a class="el" href="structsnd__ctl__ext.html#621d5b59099e3157b5dc46012be944c2">snd_ctl_ext::name</a>[32] </td>
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short name of this card; must be filled before calling <a class="el" href="group___ctl_plugin___s_d_k.html#gec4dfef098c1535fc68de820a45999be">snd_ctl_ext_create()</a>
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<a class="anchor" name="bd9522565f929b1edbf1ace70a6e4ba7"></a><!-- doxytag: member="snd_ctl_ext::nonblock" ref="bd9522565f929b1edbf1ace70a6e4ba7" args="" -->
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<td class="memname">int <a class="el" href="structsnd__ctl__ext.html#bd9522565f929b1edbf1ace70a6e4ba7">snd_ctl_ext::nonblock</a> </td>
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non-block mode; read-only
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<a class="anchor" name="6d27c5299638b97c77820428fb148231"></a><!-- doxytag: member="snd_ctl_ext::poll_fd" ref="6d27c5299638b97c77820428fb148231" args="" -->
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<td class="memname">int <a class="el" href="structsnd__ctl__ext.html#6d27c5299638b97c77820428fb148231">snd_ctl_ext::poll_fd</a> </td>
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poll descriptor
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<a class="anchor" name="596497214d8fc4ac2a57fc5fd58d44c8"></a><!-- doxytag: member="snd_ctl_ext::private_data" ref="596497214d8fc4ac2a57fc5fd58d44c8" args="" -->
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<td class="memname">void* <a class="el" href="structsnd__ctl__ext.html#596497214d8fc4ac2a57fc5fd58d44c8">snd_ctl_ext::private_data</a> </td>
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private data, which can be used freely in the driver callbacks
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<a class="anchor" name="d41d520851a84adfb9b9410c5b2adef3"></a><!-- doxytag: member="snd_ctl_ext::subscribed" ref="d41d520851a84adfb9b9410c5b2adef3" args="" -->
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<td class="memname">int <a class="el" href="structsnd__ctl__ext.html#d41d520851a84adfb9b9410c5b2adef3">snd_ctl_ext::subscribed</a> </td>
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events subscribed; read-only
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<a class="anchor" name="9f9f36662a358d6d36a18456189f020f"></a><!-- doxytag: member="snd_ctl_ext::version" ref="9f9f36662a358d6d36a18456189f020f" args="" -->
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<td class="memname">unsigned int <a class="el" href="structsnd__ctl__ext.html#9f9f36662a358d6d36a18456189f020f">snd_ctl_ext::version</a> </td>
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protocol version; <a class="el" href="group___ctl_plugin___s_d_k.html#g82b6f507e093f686c3261c30c34896a9">SND_CTL_EXT_VERSION</a> must be filled here before calling <a class="el" href="group___ctl_plugin___s_d_k.html#gec4dfef098c1535fc68de820a45999be">snd_ctl_ext_create()</a>
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<hr>The documentation for this struct was generated from the following file:<ul>
<li>/builddir/build/BUILD/alsa-lib-1.0.17a/include/<a class="el" href="control__external_8h-source.html">control_external.h</a></ul>
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