<!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/xhtml;charset=UTF-8"/> <meta http-equiv="X-UA-Compatible" content="IE=9"/> <meta name="generator" content="Doxygen 1.8.7"/> <title>ALSA project - the C library reference: External Control Plugin SDK</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="jquery.js"></script> <script type="text/javascript" src="dynsections.js"></script> <link href="search/search.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="search/search.js"></script> <script type="text/javascript"> $(document).ready(function() { searchBox.OnSelectItem(0); }); </script> <link href="doxygen.css" rel="stylesheet" type="text/css" /> </head> <body> <div id="top"><!-- do not remove this div, it is closed by doxygen! --> <div id="titlearea"> <table cellspacing="0" cellpadding="0"> <tbody> <tr style="height: 56px;"> <td style="padding-left: 0.5em;"> <div id="projectname">ALSA project - the C library reference </div> </td> </tr> </tbody> </table> </div> <!-- end header part --> <!-- Generated by Doxygen 1.8.7 --> <script type="text/javascript"> var searchBox = new SearchBox("searchBox", "search",false,'Search'); </script> <div id="navrow1" class="tabs"> <ul class="tablist"> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="pages.html"><span>Related Pages</span></a></li> <li><a href="modules.html"><span>Modules</span></a></li> <li><a href="annotated.html"><span>Data Structures</span></a></li> <li><a href="files.html"><span>Files</span></a></li> <li><a href="examples.html"><span>Examples</span></a></li> <li> <div id="MSearchBox" class="MSearchBoxInactive"> <span class="left"> <img id="MSearchSelect" src="search/mag_sel.png" onmouseover="return searchBox.OnSearchSelectShow()" onmouseout="return searchBox.OnSearchSelectHide()" alt=""/> <input type="text" id="MSearchField" value="Search" accesskey="S" onfocus="searchBox.OnSearchFieldFocus(true)" onblur="searchBox.OnSearchFieldFocus(false)" onkeyup="searchBox.OnSearchFieldChange(event)"/> </span><span class="right"> <a id="MSearchClose" href="javascript:searchBox.CloseResultsWindow()"><img id="MSearchCloseImg" border="0" src="search/close.png" alt=""/></a> </span> </div> </li> </ul> </div> </div><!-- top --> <!-- window showing the filter options --> <div id="MSearchSelectWindow" onmouseover="return searchBox.OnSearchSelectShow()" onmouseout="return searchBox.OnSearchSelectHide()" onkeydown="return searchBox.OnSearchSelectKey(event)"> <a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(0)"><span class="SelectionMark"> </span>All</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(1)"><span class="SelectionMark"> </span>Data Structures</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(2)"><span class="SelectionMark"> </span>Files</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(3)"><span class="SelectionMark"> </span>Functions</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(4)"><span class="SelectionMark"> </span>Variables</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(5)"><span class="SelectionMark"> </span>Typedefs</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(6)"><span class="SelectionMark"> </span>Enumerations</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(7)"><span class="SelectionMark"> </span>Enumerator</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(8)"><span class="SelectionMark"> </span>Macros</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(9)"><span class="SelectionMark"> </span>Groups</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(10)"><span class="SelectionMark"> </span>Pages</a></div> <!-- iframe showing the search results (closed by default) --> <div id="MSearchResultsWindow"> <iframe src="javascript:void(0)" frameborder="0" name="MSearchResults" id="MSearchResults"> </iframe> </div> <div class="header"> <div class="summary"> <a href="#files">Files</a> | <a href="#nested-classes">Data Structures</a> | <a href="#define-members">Macros</a> | <a href="#typedef-members">Typedefs</a> | <a href="#enum-members">Enumerations</a> | <a href="#func-members">Functions</a> </div> <div class="headertitle"> <div class="title">External Control Plugin SDK</div> </div> </div><!--header--> <div class="contents"> <table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="files"></a> Files</h2></td></tr> <tr class="memitem:control__ext_8c"><td class="memItemLeft" align="right" valign="top">file  </td><td class="memItemRight" valign="bottom"><a class="el" href="control__ext_8c.html">control_ext.c</a></td></tr> <tr class="memdesc:control__ext_8c"><td class="mdescLeft"> </td><td class="mdescRight">External Control Plugin SDK. <br /></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> </table><table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="nested-classes"></a> Data Structures</h2></td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structsnd__ctl__ext.html">snd_ctl_ext_t</a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structsnd__ctl__ext__callback.html">snd_ctl_ext_callback_t</a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> </table><table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="define-members"></a> Macros</h2></td></tr> <tr class="memitem:gac015d294d7ae50614f6991da93893c3b"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___ctl_plugin___s_d_k.html#gac015d294d7ae50614f6991da93893c3b">SND_CTL_PLUGIN_ENTRY</a>(name)   _snd_ctl_##name##_open</td></tr> <tr class="separator:gac015d294d7ae50614f6991da93893c3b"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:gaa94fc65e8951f16e4b273b0f81e90f7e"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___ctl_plugin___s_d_k.html#gaa94fc65e8951f16e4b273b0f81e90f7e">SND_CTL_PLUGIN_SYMBOL</a>(name)   <a class="el" href="group___global.html#ga355c462c8c5dee0aeadae17d096ba531">SND_DLSYM_BUILD_VERSION</a>(<a class="el" href="group___ctl_plugin___s_d_k.html#gac015d294d7ae50614f6991da93893c3b">SND_CTL_PLUGIN_ENTRY</a>(name), <a class="el" href="group___control.html#ga2dc20c3f1d96252ba1f5563cfede392d">SND_CONTROL_DLSYM_VERSION</a>);</td></tr> <tr class="separator:gaa94fc65e8951f16e4b273b0f81e90f7e"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga13e494fe5c6068d6608a974f5a62a430"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___ctl_plugin___s_d_k.html#ga13e494fe5c6068d6608a974f5a62a430">SND_CTL_PLUGIN_DEFINE_FUNC</a>(plugin)</td></tr> <tr class="separator:ga13e494fe5c6068d6608a974f5a62a430"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga110bc1818d56d22b89e2773d7c54a115"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___ctl_plugin___s_d_k.html#ga110bc1818d56d22b89e2773d7c54a115">SND_CTL_EXT_VERSION_MAJOR</a>   1</td></tr> <tr class="separator:ga110bc1818d56d22b89e2773d7c54a115"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga9ace8ce6f67297cba3bb365b600c8bd8"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___ctl_plugin___s_d_k.html#ga9ace8ce6f67297cba3bb365b600c8bd8">SND_CTL_EXT_VERSION_MINOR</a>   0</td></tr> <tr class="separator:ga9ace8ce6f67297cba3bb365b600c8bd8"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:gae99e1c9ee4d5c9e9afaa0376a2af96eb"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___ctl_plugin___s_d_k.html#gae99e1c9ee4d5c9e9afaa0376a2af96eb">SND_CTL_EXT_VERSION_TINY</a>   1</td></tr> <tr class="separator:gae99e1c9ee4d5c9e9afaa0376a2af96eb"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga65ea29f84b09ee3e640f88b06d05a1a2"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___ctl_plugin___s_d_k.html#ga65ea29f84b09ee3e640f88b06d05a1a2">SND_CTL_EXT_VERSION</a></td></tr> <tr class="separator:ga65ea29f84b09ee3e640f88b06d05a1a2"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:gac1f0737189a30bbb1e4dcbf681df39fd"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___ctl_plugin___s_d_k.html#gac1f0737189a30bbb1e4dcbf681df39fd">SND_CTL_EXT_KEY_NOT_FOUND</a>   (<a class="el" href="group___ctl_plugin___s_d_k.html#gac73a66a3973afb51c4e585177647c693">snd_ctl_ext_key_t</a>)(-1)</td></tr> <tr class="separator:gac1f0737189a30bbb1e4dcbf681df39fd"><td class="memSeparator" colspan="2"> </td></tr> </table><table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="typedef-members"></a> Typedefs</h2></td></tr> <tr class="memitem:gac73a66a3973afb51c4e585177647c693"><td class="memItemLeft" align="right" valign="top">typedef unsigned long </td><td class="memItemRight" valign="bottom"><a class="el" href="group___ctl_plugin___s_d_k.html#gac73a66a3973afb51c4e585177647c693">snd_ctl_ext_key_t</a></td></tr> <tr class="separator:gac73a66a3973afb51c4e585177647c693"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga6e8d1fd87ddef00af5a9e2dd6c77b1db"><td class="memItemLeft" align="right" valign="top">typedef <a class="el" href="structsnd__ctl__ext.html">snd_ctl_ext</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___ctl_plugin___s_d_k.html#ga6e8d1fd87ddef00af5a9e2dd6c77b1db">snd_ctl_ext_t</a></td></tr> <tr class="separator:ga6e8d1fd87ddef00af5a9e2dd6c77b1db"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga8185c9a0e27e9562511a82dda1d20ddf"><td class="memItemLeft" align="right" valign="top">typedef <a class="el" href="structsnd__ctl__ext__callback.html">snd_ctl_ext_callback</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___ctl_plugin___s_d_k.html#ga8185c9a0e27e9562511a82dda1d20ddf">snd_ctl_ext_callback_t</a></td></tr> <tr class="separator:ga8185c9a0e27e9562511a82dda1d20ddf"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:gad7fdc2e15d89921ad090e96579099b2b"><td class="memItemLeft" align="right" valign="top">typedef int( </td><td class="memItemRight" valign="bottom"><a class="el" href="group___ctl_plugin___s_d_k.html#gad7fdc2e15d89921ad090e96579099b2b">snd_ctl_ext_tlv_rw_t</a> )(<a class="el" href="group___ctl_plugin___s_d_k.html#ga6e8d1fd87ddef00af5a9e2dd6c77b1db">snd_ctl_ext_t</a> *ext, <a class="el" href="group___ctl_plugin___s_d_k.html#gac73a66a3973afb51c4e585177647c693">snd_ctl_ext_key_t</a> key, int op_flag, unsigned int numid, unsigned int *tlv, unsigned int tlv_size)</td></tr> <tr class="separator:gad7fdc2e15d89921ad090e96579099b2b"><td class="memSeparator" colspan="2"> </td></tr> </table><table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="enum-members"></a> Enumerations</h2></td></tr> <tr class="memitem:gaeedd1d7413b3025e9cede1b27e509de5"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="group___ctl_plugin___s_d_k.html#gaeedd1d7413b3025e9cede1b27e509de5">snd_ctl_ext_access_t</a> { <br />   <b>SND_CTL_EXT_ACCESS_READ</b> = (1<<0), <b>SND_CTL_EXT_ACCESS_WRITE</b> = (1<<1), <b>SND_CTL_EXT_ACCESS_READWRITE</b> = (3<<0), <b>SND_CTL_EXT_ACCESS_VOLATILE</b> = (1<<2), <br />   <b>SND_CTL_EXT_ACCESS_TLV_READ</b> = (1<<4), <b>SND_CTL_EXT_ACCESS_TLV_WRITE</b> = (1<<5), <b>SND_CTL_EXT_ACCESS_TLV_READWRITE</b> = (3<<4), <b>SND_CTL_EXT_ACCESS_TLV_COMMAND</b> = (1<<6), <br />   <b>SND_CTL_EXT_ACCESS_INACTIVE</b> = (1<<8), <b>SND_CTL_EXT_ACCESS_TLV_CALLBACK</b> = (1<<28) <br /> }</td></tr> <tr class="separator:gaeedd1d7413b3025e9cede1b27e509de5"><td class="memSeparator" colspan="2"> </td></tr> </table><table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a> Functions</h2></td></tr> <tr class="memitem:ga317775f9c5e239781e71735ca5ba1ca6"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___ctl_plugin___s_d_k.html#ga317775f9c5e239781e71735ca5ba1ca6">snd_ctl_ext_create</a> (<a class="el" href="group___ctl_plugin___s_d_k.html#ga6e8d1fd87ddef00af5a9e2dd6c77b1db">snd_ctl_ext_t</a> *ext, const char *name, int mode)</td></tr> <tr class="memdesc:ga317775f9c5e239781e71735ca5ba1ca6"><td class="mdescLeft"> </td><td class="mdescRight">Create an external control plugin instance. <a href="#ga317775f9c5e239781e71735ca5ba1ca6">More...</a><br /></td></tr> <tr class="separator:ga317775f9c5e239781e71735ca5ba1ca6"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga33fadf68f6414722876f21201214f76e"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___ctl_plugin___s_d_k.html#ga33fadf68f6414722876f21201214f76e">snd_ctl_ext_delete</a> (<a class="el" href="group___ctl_plugin___s_d_k.html#ga6e8d1fd87ddef00af5a9e2dd6c77b1db">snd_ctl_ext_t</a> *ext)</td></tr> <tr class="memdesc:ga33fadf68f6414722876f21201214f76e"><td class="mdescLeft"> </td><td class="mdescRight">Delete the external control plugin. <a href="#ga33fadf68f6414722876f21201214f76e">More...</a><br /></td></tr> <tr class="separator:ga33fadf68f6414722876f21201214f76e"><td class="memSeparator" colspan="2"> </td></tr> </table> <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2> <h2 class="groupheader">Macro Definition Documentation</h2> <a class="anchor" id="gac1f0737189a30bbb1e4dcbf681df39fd"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">#define SND_CTL_EXT_KEY_NOT_FOUND   (<a class="el" href="group___ctl_plugin___s_d_k.html#gac73a66a3973afb51c4e585177647c693">snd_ctl_ext_key_t</a>)(-1)</td> </tr> </table> </div><div class="memdoc"> <p>find_elem callback returns this if no matching control element is found </p> </div> </div> <a class="anchor" id="ga65ea29f84b09ee3e640f88b06d05a1a2"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">#define SND_CTL_EXT_VERSION</td> </tr> </table> </div><div class="memdoc"> <b>Value:</b><div class="fragment"><div class="line">((<a class="code" href="group___ctl_plugin___s_d_k.html#ga110bc1818d56d22b89e2773d7c54a115">SND_CTL_EXT_VERSION_MAJOR</a><<16) |\</div> <div class="line"> (<a class="code" href="group___ctl_plugin___s_d_k.html#ga9ace8ce6f67297cba3bb365b600c8bd8">SND_CTL_EXT_VERSION_MINOR</a><<8) |\</div> <div class="line"> (<a class="code" href="group___ctl_plugin___s_d_k.html#gae99e1c9ee4d5c9e9afaa0376a2af96eb">SND_CTL_EXT_VERSION_TINY</a>))</div> <div class="ttc" id="group___ctl_plugin___s_d_k_html_ga110bc1818d56d22b89e2773d7c54a115"><div class="ttname"><a href="group___ctl_plugin___s_d_k.html#ga110bc1818d56d22b89e2773d7c54a115">SND_CTL_EXT_VERSION_MAJOR</a></div><div class="ttdeci">#define SND_CTL_EXT_VERSION_MAJOR</div><div class="ttdef"><b>Definition:</b> control_external.h:75</div></div> <div class="ttc" id="group___ctl_plugin___s_d_k_html_gae99e1c9ee4d5c9e9afaa0376a2af96eb"><div class="ttname"><a href="group___ctl_plugin___s_d_k.html#gae99e1c9ee4d5c9e9afaa0376a2af96eb">SND_CTL_EXT_VERSION_TINY</a></div><div class="ttdeci">#define SND_CTL_EXT_VERSION_TINY</div><div class="ttdef"><b>Definition:</b> control_external.h:77</div></div> <div class="ttc" id="group___ctl_plugin___s_d_k_html_ga9ace8ce6f67297cba3bb365b600c8bd8"><div class="ttname"><a href="group___ctl_plugin___s_d_k.html#ga9ace8ce6f67297cba3bb365b600c8bd8">SND_CTL_EXT_VERSION_MINOR</a></div><div class="ttdeci">#define SND_CTL_EXT_VERSION_MINOR</div><div class="ttdef"><b>Definition:</b> control_external.h:76</div></div> </div><!-- fragment --><p>external plugin protocol version </p> </div> </div> <a class="anchor" id="ga110bc1818d56d22b89e2773d7c54a115"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">#define SND_CTL_EXT_VERSION_MAJOR   1</td> </tr> </table> </div><div class="memdoc"> <p>Protocol major version </p> </div> </div> <a class="anchor" id="ga9ace8ce6f67297cba3bb365b600c8bd8"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">#define SND_CTL_EXT_VERSION_MINOR   0</td> </tr> </table> </div><div class="memdoc"> <p>Protocol minor version </p> </div> </div> <a class="anchor" id="gae99e1c9ee4d5c9e9afaa0376a2af96eb"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">#define SND_CTL_EXT_VERSION_TINY   1</td> </tr> </table> </div><div class="memdoc"> <p>Protocol tiny version </p> </div> </div> <a class="anchor" id="ga13e494fe5c6068d6608a974f5a62a430"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">#define SND_CTL_PLUGIN_DEFINE_FUNC</td> <td>(</td> <td class="paramtype"> </td> <td class="paramname">plugin</td><td>)</td> <td></td> </tr> </table> </div><div class="memdoc"> <b>Value:</b><div class="fragment"><div class="line"><span class="keywordtype">int</span> <a class="code" href="group___ctl_plugin___s_d_k.html#gac015d294d7ae50614f6991da93893c3b">SND_CTL_PLUGIN_ENTRY</a>(plugin) (<a class="code" href="group___control.html#ga06628f38def84a0fe3da74041db9d51f">snd_ctl_t</a> **handlep, <span class="keyword">const</span> <span class="keywordtype">char</span> *name,<a class="code" href="group___config.html#ga1c20905af775ae77d04d1a5696f67985">\</a></div> <div class="line"><a class="code" href="group___config.html#ga1c20905af775ae77d04d1a5696f67985"> snd_config_t</a> *root, <a class="code" href="group___config.html#ga1c20905af775ae77d04d1a5696f67985">snd_config_t</a> *conf, <span class="keywordtype">int</span> mode)</div> <div class="ttc" id="group___control_html_ga06628f38def84a0fe3da74041db9d51f"><div class="ttname"><a href="group___control.html#ga06628f38def84a0fe3da74041db9d51f">snd_ctl_t</a></div><div class="ttdeci">struct _snd_ctl snd_ctl_t</div><div class="ttdef"><b>Definition:</b> control.h:214</div></div> <div class="ttc" id="group___ctl_plugin___s_d_k_html_gac015d294d7ae50614f6991da93893c3b"><div class="ttname"><a href="group___ctl_plugin___s_d_k.html#gac015d294d7ae50614f6991da93893c3b">SND_CTL_PLUGIN_ENTRY</a></div><div class="ttdeci">#define SND_CTL_PLUGIN_ENTRY(name)</div><div class="ttdef"><b>Definition:</b> control_external.h:43</div></div> <div class="ttc" id="group___config_html_ga1c20905af775ae77d04d1a5696f67985"><div class="ttname"><a href="group___config.html#ga1c20905af775ae77d04d1a5696f67985">snd_config_t</a></div><div class="ttdeci">struct _snd_config snd_config_t</div><div class="ttdoc">Internal structure for a configuration node object. </div><div class="ttdef"><b>Definition:</b> conf.h:69</div></div> </div><!-- fragment --><p>Define the control plugin </p> </div> </div> <a class="anchor" id="gac015d294d7ae50614f6991da93893c3b"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">#define SND_CTL_PLUGIN_ENTRY</td> <td>(</td> <td class="paramtype"> </td> <td class="paramname">name</td><td>)</td> <td>   _snd_ctl_##name##_open</td> </tr> </table> </div><div class="memdoc"> <p>Define the object entry for external control plugins </p> </div> </div> <a class="anchor" id="gaa94fc65e8951f16e4b273b0f81e90f7e"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">#define SND_CTL_PLUGIN_SYMBOL</td> <td>(</td> <td class="paramtype"> </td> <td class="paramname">name</td><td>)</td> <td>   <a class="el" href="group___global.html#ga355c462c8c5dee0aeadae17d096ba531">SND_DLSYM_BUILD_VERSION</a>(<a class="el" href="group___ctl_plugin___s_d_k.html#gac015d294d7ae50614f6991da93893c3b">SND_CTL_PLUGIN_ENTRY</a>(name), <a class="el" href="group___control.html#ga2dc20c3f1d96252ba1f5563cfede392d">SND_CONTROL_DLSYM_VERSION</a>);</td> </tr> </table> </div><div class="memdoc"> <p>Define the symbols of the given control plugin with versions </p> </div> </div> <h2 class="groupheader">Typedef Documentation</h2> <a class="anchor" id="ga8185c9a0e27e9562511a82dda1d20ddf"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">typedef struct <a class="el" href="structsnd__ctl__ext__callback.html">snd_ctl_ext_callback</a> <a class="el" href="group___ctl_plugin___s_d_k.html#ga8185c9a0e27e9562511a82dda1d20ddf">snd_ctl_ext_callback_t</a></td> </tr> </table> </div><div class="memdoc"> <p>Callback table of control ext </p> </div> </div> <a class="anchor" id="gac73a66a3973afb51c4e585177647c693"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">typedef unsigned long <a class="el" href="group___ctl_plugin___s_d_k.html#gac73a66a3973afb51c4e585177647c693">snd_ctl_ext_key_t</a></td> </tr> </table> </div><div class="memdoc"> <p>Key to access a control pointer </p> </div> </div> <a class="anchor" id="ga6e8d1fd87ddef00af5a9e2dd6c77b1db"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">typedef struct <a class="el" href="structsnd__ctl__ext.html">snd_ctl_ext</a> <a class="el" href="group___ctl_plugin___s_d_k.html#ga6e8d1fd87ddef00af5a9e2dd6c77b1db">snd_ctl_ext_t</a></td> </tr> </table> </div><div class="memdoc"> <p>External control plugin handle </p> </div> </div> <a class="anchor" id="gad7fdc2e15d89921ad090e96579099b2b"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">typedef int( snd_ctl_ext_tlv_rw_t)(<a class="el" href="group___ctl_plugin___s_d_k.html#ga6e8d1fd87ddef00af5a9e2dd6c77b1db">snd_ctl_ext_t</a> *ext, <a class="el" href="group___ctl_plugin___s_d_k.html#gac73a66a3973afb51c4e585177647c693">snd_ctl_ext_key_t</a> key, int op_flag, unsigned int numid, unsigned int *tlv, unsigned int tlv_size)</td> </tr> </table> </div><div class="memdoc"> <p>Callback to handle TLV commands. </p> </div> </div> <h2 class="groupheader">Enumeration Type Documentation</h2> <a class="anchor" id="gaeedd1d7413b3025e9cede1b27e509de5"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">enum <a class="el" href="group___ctl_plugin___s_d_k.html#gaeedd1d7413b3025e9cede1b27e509de5">snd_ctl_ext_access_t</a></td> </tr> </table> </div><div class="memdoc"> <p>The access type bits stored in get_attribute callback </p> </div> </div> <h2 class="groupheader">Function Documentation</h2> <a class="anchor" id="ga317775f9c5e239781e71735ca5ba1ca6"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">int snd_ctl_ext_create </td> <td>(</td> <td class="paramtype"><a class="el" href="group___ctl_plugin___s_d_k.html#ga6e8d1fd87ddef00af5a9e2dd6c77b1db">snd_ctl_ext_t</a> * </td> <td class="paramname"><em>ext</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">const char * </td> <td class="paramname"><em>name</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">int </td> <td class="paramname"><em>mode</em> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td> </tr> </table> </div><div class="memdoc"> <p>Create an external control plugin instance. </p> <dl class="params"><dt>Parameters</dt><dd> <table class="params"> <tr><td class="paramname">ext</td><td>the plugin handle </td></tr> <tr><td class="paramname">name</td><td>name of control </td></tr> <tr><td class="paramname">mode</td><td>control open mode </td></tr> </table> </dd> </dl> <dl class="section return"><dt>Returns</dt><dd>0 if successful, or a negative error code</dd></dl> <p>Creates the external control instance. </p> </div> </div> <a class="anchor" id="ga33fadf68f6414722876f21201214f76e"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">int snd_ctl_ext_delete </td> <td>(</td> <td class="paramtype"><a class="el" href="group___ctl_plugin___s_d_k.html#ga6e8d1fd87ddef00af5a9e2dd6c77b1db">snd_ctl_ext_t</a> * </td> <td class="paramname"><em>ext</em></td><td>)</td> <td></td> </tr> </table> </div><div class="memdoc"> <p>Delete the external control plugin. </p> <dl class="params"><dt>Parameters</dt><dd> <table class="params"> <tr><td class="paramname">ext</td><td>the plugin handle </td></tr> </table> </dd> </dl> <dl class="section return"><dt>Returns</dt><dd>0 if successful, or a negative error code </dd></dl> </div> </div> </div><!-- contents --> <!-- start footer part --> <hr class="footer"/><address class="footer"><small> Generated on Wed Jun 18 2014 05:47:50 for ALSA project - the C library reference by  <a href="http://www.doxygen.org/index.html"> <img class="footer" src="doxygen.png" alt="doxygen"/> </a> 1.8.7 </small></address> </body> </html>