<!-- This comment will put IE 6, 7 and 8 in quirks mode --> <!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"/> <title>ALSA project - the C library reference: External I/O plugin SDK</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <link href="search/search.css" rel="stylesheet" type="text/css"/> <script type="text/javaScript" src="search/search.js"></script> <link href="doxygen.css" rel="stylesheet" type="text/css"/> </head> <body onload='searchBox.OnSelectItem(0);'> <!-- Generated by Doxygen 1.6.3 --> <script type="text/javascript"><!-- var searchBox = new SearchBox("searchBox", "search",false,'Search'); --></script> <div class="navigation" id="top"> <div class="tabs"> <ul> <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"> <img id="MSearchSelect" src="search/search.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)"/> <a id="MSearchClose" href="javascript:searchBox.CloseResultsWindow()"><img id="MSearchCloseImg" border="0" src="search/close.png" alt=""/></a> </div> </li> </ul> </div> </div> <div class="contents"> <h1>External I/O plugin SDK<br/> <small> [<a class="el" href="group___plugin___s_d_k.html">External PCM plugin SDK</a>]</small> </h1><table border="0" cellpadding="0" cellspacing="0"> <tr><td colspan="2"><h2>Data Structures</h2></td></tr> <tr><td class="memItemLeft" align="right" valign="top">struct </td><td class="memItemRight" valign="bottom"><a class="el" href="structsnd__pcm__ioplug.html">snd_pcm_ioplug_t</a></td></tr> <tr><td class="memItemLeft" align="right" valign="top">struct </td><td class="memItemRight" valign="bottom"><a class="el" href="structsnd__pcm__ioplug__callback.html">snd_pcm_ioplug_callback_t</a></td></tr> <tr><td colspan="2"><h2>Defines</h2></td></tr> <tr><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___i_o_plug.html#ga435c57838f97c24b7274a9596ccbe3b6">SND_PCM_IOPLUG_FLAG_LISTED</a> (1<<0)</td></tr> <tr><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___i_o_plug.html#gad5c0b67e4d9b7be96f1083179e95f38a">SND_PCM_IOPLUG_FLAG_MONOTONIC</a> (1<<1)</td></tr> <tr><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___i_o_plug.html#ga46f4111ec394e6c4209a4e1b5f99a9f7">SND_PCM_IOPLUG_VERSION_MAJOR</a> 1</td></tr> <tr><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___i_o_plug.html#ga49ea8946ea0c9b2655b70afb03ed79bd">SND_PCM_IOPLUG_VERSION_MINOR</a> 0</td></tr> <tr><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___i_o_plug.html#gabe46103216aa58afc3c4bc314dd1bbc6">SND_PCM_IOPLUG_VERSION_TINY</a> 1</td></tr> <tr><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___i_o_plug.html#ga81a2273c4df9be29d91e6e2a0860d991">SND_PCM_IOPLUG_VERSION</a></td></tr> <tr><td colspan="2"><h2>Enumerations</h2></td></tr> <tr><td class="memItemLeft" align="right" valign="top">enum </td><td class="memItemRight" valign="bottom">{ <br/> <a class="el" href="group___p_c_m___i_o_plug.html#gga726ca809ffd3d67ab4b8476646f26635adf64bb9d9a7f95f878e8bb22e003c357">SND_PCM_IOPLUG_HW_ACCESS</a> = 0, <a class="el" href="group___p_c_m___i_o_plug.html#gga726ca809ffd3d67ab4b8476646f26635aa7186fa6ab3791611363c83f725f1a57">SND_PCM_IOPLUG_HW_FORMAT</a>, <a class="el" href="group___p_c_m___i_o_plug.html#gga726ca809ffd3d67ab4b8476646f26635a5cb59832a513d2b87166000d3f4035e2">SND_PCM_IOPLUG_HW_CHANNELS</a>, <a class="el" href="group___p_c_m___i_o_plug.html#gga726ca809ffd3d67ab4b8476646f26635a43827c9773bc5c40a1643bd8f930c8d1">SND_PCM_IOPLUG_HW_RATE</a>, <br/> <a class="el" href="group___p_c_m___i_o_plug.html#gga726ca809ffd3d67ab4b8476646f26635aafe12ebbe6f618aa75cc7c5d64d45eda">SND_PCM_IOPLUG_HW_PERIOD_BYTES</a>, <a class="el" href="group___p_c_m___i_o_plug.html#gga726ca809ffd3d67ab4b8476646f26635a004f7b7af23b37d30d520777158e8277">SND_PCM_IOPLUG_HW_BUFFER_BYTES</a>, <a class="el" href="group___p_c_m___i_o_plug.html#gga726ca809ffd3d67ab4b8476646f26635a1f68c89ac11ae9fe28710cee044a0b94">SND_PCM_IOPLUG_HW_PERIODS</a>, <a class="el" href="group___p_c_m___i_o_plug.html#gga726ca809ffd3d67ab4b8476646f26635ab024a119736127e7a606c75e57d34585">SND_PCM_IOPLUG_HW_PARAMS</a> <br/> }</td></tr> <tr><td colspan="2"><h2>Functions</h2></td></tr> <tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___i_o_plug.html#ga7fb5213a5e776246e2b4dc53ec8d7604">snd_pcm_ioplug_create</a> (snd_pcm_ioplug_t *io, const char *name, <a class="el" href="group___p_c_m.html#gac23b43ff55add78638e503b9cc892c24">snd_pcm_stream_t</a> stream, int mode)</td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">Create an ioplug instance. <a href="#ga7fb5213a5e776246e2b4dc53ec8d7604"></a><br/></td></tr> <tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___i_o_plug.html#ga286ec116983166de889f0268a2c666ef">snd_pcm_ioplug_delete</a> (snd_pcm_ioplug_t *io)</td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">Delete the ioplug instance. <a href="#ga286ec116983166de889f0268a2c666ef"></a><br/></td></tr> <tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___i_o_plug.html#gab223893226ecf78f675c89959a8c421a">snd_pcm_ioplug_reinit_status</a> (snd_pcm_ioplug_t *ioplug)</td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">Reinitialize the poll and mmap status. <a href="#gab223893226ecf78f675c89959a8c421a"></a><br/></td></tr> <tr><td class="memItemLeft" align="right" valign="top">const <a class="el" href="structsnd__pcm__channel__area__t.html">snd_pcm_channel_area_t</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___i_o_plug.html#gac3b666ff286745c9eb24de3e3930970a">snd_pcm_ioplug_mmap_areas</a> (snd_pcm_ioplug_t *ioplug)</td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">Get mmap area of ioplug. <a href="#gac3b666ff286745c9eb24de3e3930970a"></a><br/></td></tr> <tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___i_o_plug.html#gad74355dfaa56fae80d49181c83eeecc4">snd_pcm_ioplug_params_reset</a> (snd_pcm_ioplug_t *io)</td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">Reset ioplug parameters. <a href="#gad74355dfaa56fae80d49181c83eeecc4"></a><br/></td></tr> <tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___i_o_plug.html#gab62d470b02661214319196394b55fb37">snd_pcm_ioplug_set_param_minmax</a> (snd_pcm_ioplug_t *io, int type, unsigned int min, unsigned int max)</td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">Set parameter as the min/max values. <a href="#gab62d470b02661214319196394b55fb37"></a><br/></td></tr> <tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___i_o_plug.html#ga7d713552fb846ccdf4b7ec6a9fc1b562">snd_pcm_ioplug_set_param_list</a> (snd_pcm_ioplug_t *io, int type, unsigned int num_list, const unsigned int *list)</td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">Set parameter as the list. <a href="#ga7d713552fb846ccdf4b7ec6a9fc1b562"></a><br/></td></tr> <tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___i_o_plug.html#ga65feed7caf26f07aad0c722fc61fe751">snd_pcm_ioplug_set_state</a> (snd_pcm_ioplug_t *ioplug, <a class="el" href="group___p_c_m.html#ga61ac499cb3701ce536d4d83725908860">snd_pcm_state_t</a> state)</td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">Change the ioplug PCM status. <a href="#ga65feed7caf26f07aad0c722fc61fe751"></a><br/></td></tr> </table> <hr/><a name="_details"></a><h2>Detailed Description</h2> <p>See the <a class="el" href="pcm.html">PCM (digital audio) interface</a> page for more details. </p> <hr/><h2>Define Documentation</h2> <a class="anchor" id="ga435c57838f97c24b7274a9596ccbe3b6"></a><!-- doxytag: member="pcm_ioplug.h::SND_PCM_IOPLUG_FLAG_LISTED" ref="ga435c57838f97c24b7274a9596ccbe3b6" args="" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">#define SND_PCM_IOPLUG_FLAG_LISTED (1<<0)</td> </tr> </table> </div> <div class="memdoc"> <p>list up this PCM </p> </div> </div> <a class="anchor" id="gad5c0b67e4d9b7be96f1083179e95f38a"></a><!-- doxytag: member="pcm_ioplug.h::SND_PCM_IOPLUG_FLAG_MONOTONIC" ref="gad5c0b67e4d9b7be96f1083179e95f38a" args="" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">#define SND_PCM_IOPLUG_FLAG_MONOTONIC (1<<1)</td> </tr> </table> </div> <div class="memdoc"> <p>monotonic timestamps </p> </div> </div> <a class="anchor" id="ga81a2273c4df9be29d91e6e2a0860d991"></a><!-- doxytag: member="pcm_ioplug.h::SND_PCM_IOPLUG_VERSION" ref="ga81a2273c4df9be29d91e6e2a0860d991" args="" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">#define SND_PCM_IOPLUG_VERSION</td> </tr> </table> </div> <div class="memdoc"> <b>Value:</b><div class="fragment"><pre class="fragment">((<a class="code" href="group___p_c_m___i_o_plug.html#ga46f4111ec394e6c4209a4e1b5f99a9f7">SND_PCM_IOPLUG_VERSION_MAJOR</a><<16) |\ (<a class="code" href="group___p_c_m___i_o_plug.html#ga49ea8946ea0c9b2655b70afb03ed79bd">SND_PCM_IOPLUG_VERSION_MINOR</a><<8) |\ (<a class="code" href="group___p_c_m___i_o_plug.html#gabe46103216aa58afc3c4bc314dd1bbc6">SND_PCM_IOPLUG_VERSION_TINY</a>)) </pre></div><p>IO-plugin protocol version </p> </div> </div> <a class="anchor" id="ga46f4111ec394e6c4209a4e1b5f99a9f7"></a><!-- doxytag: member="pcm_ioplug.h::SND_PCM_IOPLUG_VERSION_MAJOR" ref="ga46f4111ec394e6c4209a4e1b5f99a9f7" args="" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">#define SND_PCM_IOPLUG_VERSION_MAJOR 1</td> </tr> </table> </div> <div class="memdoc"> <p>Protocol major version </p> </div> </div> <a class="anchor" id="ga49ea8946ea0c9b2655b70afb03ed79bd"></a><!-- doxytag: member="pcm_ioplug.h::SND_PCM_IOPLUG_VERSION_MINOR" ref="ga49ea8946ea0c9b2655b70afb03ed79bd" args="" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">#define SND_PCM_IOPLUG_VERSION_MINOR 0</td> </tr> </table> </div> <div class="memdoc"> <p>Protocol minor version </p> </div> </div> <a class="anchor" id="gabe46103216aa58afc3c4bc314dd1bbc6"></a><!-- doxytag: member="pcm_ioplug.h::SND_PCM_IOPLUG_VERSION_TINY" ref="gabe46103216aa58afc3c4bc314dd1bbc6" args="" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">#define SND_PCM_IOPLUG_VERSION_TINY 1</td> </tr> </table> </div> <div class="memdoc"> <p>Protocol tiny version </p> </div> </div> <hr/><h2>Enumeration Type Documentation</h2> <a class="anchor" id="ga726ca809ffd3d67ab4b8476646f26635"></a><!-- doxytag: member="pcm_ioplug.h::@6" ref="ga726ca809ffd3d67ab4b8476646f26635" args="" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">anonymous enum</td> </tr> </table> </div> <div class="memdoc"> <p>hw constraints for ioplug </p> <dl><dt><b>Enumerator: </b></dt><dd><table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"><em><a class="anchor" id="gga726ca809ffd3d67ab4b8476646f26635adf64bb9d9a7f95f878e8bb22e003c357"></a><!-- doxytag: member="SND_PCM_IOPLUG_HW_ACCESS" ref="gga726ca809ffd3d67ab4b8476646f26635adf64bb9d9a7f95f878e8bb22e003c357" args="" -->SND_PCM_IOPLUG_HW_ACCESS</em> </td><td> <p>access type </p> </td></tr> <tr><td valign="top"><em><a class="anchor" id="gga726ca809ffd3d67ab4b8476646f26635aa7186fa6ab3791611363c83f725f1a57"></a><!-- doxytag: member="SND_PCM_IOPLUG_HW_FORMAT" ref="gga726ca809ffd3d67ab4b8476646f26635aa7186fa6ab3791611363c83f725f1a57" args="" -->SND_PCM_IOPLUG_HW_FORMAT</em> </td><td> <p>format </p> </td></tr> <tr><td valign="top"><em><a class="anchor" id="gga726ca809ffd3d67ab4b8476646f26635a5cb59832a513d2b87166000d3f4035e2"></a><!-- doxytag: member="SND_PCM_IOPLUG_HW_CHANNELS" ref="gga726ca809ffd3d67ab4b8476646f26635a5cb59832a513d2b87166000d3f4035e2" args="" -->SND_PCM_IOPLUG_HW_CHANNELS</em> </td><td> <p>channels </p> </td></tr> <tr><td valign="top"><em><a class="anchor" id="gga726ca809ffd3d67ab4b8476646f26635a43827c9773bc5c40a1643bd8f930c8d1"></a><!-- doxytag: member="SND_PCM_IOPLUG_HW_RATE" ref="gga726ca809ffd3d67ab4b8476646f26635a43827c9773bc5c40a1643bd8f930c8d1" args="" -->SND_PCM_IOPLUG_HW_RATE</em> </td><td> <p>rate </p> </td></tr> <tr><td valign="top"><em><a class="anchor" id="gga726ca809ffd3d67ab4b8476646f26635aafe12ebbe6f618aa75cc7c5d64d45eda"></a><!-- doxytag: member="SND_PCM_IOPLUG_HW_PERIOD_BYTES" ref="gga726ca809ffd3d67ab4b8476646f26635aafe12ebbe6f618aa75cc7c5d64d45eda" args="" -->SND_PCM_IOPLUG_HW_PERIOD_BYTES</em> </td><td> <p>period bytes </p> </td></tr> <tr><td valign="top"><em><a class="anchor" id="gga726ca809ffd3d67ab4b8476646f26635a004f7b7af23b37d30d520777158e8277"></a><!-- doxytag: member="SND_PCM_IOPLUG_HW_BUFFER_BYTES" ref="gga726ca809ffd3d67ab4b8476646f26635a004f7b7af23b37d30d520777158e8277" args="" -->SND_PCM_IOPLUG_HW_BUFFER_BYTES</em> </td><td> <p>buffer bytes </p> </td></tr> <tr><td valign="top"><em><a class="anchor" id="gga726ca809ffd3d67ab4b8476646f26635a1f68c89ac11ae9fe28710cee044a0b94"></a><!-- doxytag: member="SND_PCM_IOPLUG_HW_PERIODS" ref="gga726ca809ffd3d67ab4b8476646f26635a1f68c89ac11ae9fe28710cee044a0b94" args="" -->SND_PCM_IOPLUG_HW_PERIODS</em> </td><td> <p>number of periods </p> </td></tr> <tr><td valign="top"><em><a class="anchor" id="gga726ca809ffd3d67ab4b8476646f26635ab024a119736127e7a606c75e57d34585"></a><!-- doxytag: member="SND_PCM_IOPLUG_HW_PARAMS" ref="gga726ca809ffd3d67ab4b8476646f26635ab024a119736127e7a606c75e57d34585" args="" -->SND_PCM_IOPLUG_HW_PARAMS</em> </td><td> <p>max number of hw constraints </p> </td></tr> </table> </dd> </dl> </div> </div> <hr/><h2>Function Documentation</h2> <a class="anchor" id="ga7fb5213a5e776246e2b4dc53ec8d7604"></a><!-- doxytag: member="pcm_ioplug.h::snd_pcm_ioplug_create" ref="ga7fb5213a5e776246e2b4dc53ec8d7604" args="(snd_pcm_ioplug_t *io, const char *name, snd_pcm_stream_t stream, int mode)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">int snd_pcm_ioplug_create </td> <td>(</td> <td class="paramtype">snd_pcm_ioplug_t * </td> <td class="paramname"> <em>ioplug</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"><a class="el" href="group___p_c_m.html#gac23b43ff55add78638e503b9cc892c24">snd_pcm_stream_t</a> </td> <td class="paramname"> <em>stream</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">int </td> <td class="paramname"> <em>mode</em></td><td> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td><td></td> </tr> </table> </div> <div class="memdoc"> <p>Create an ioplug instance. </p> <dl><dt><b>Parameters:</b></dt><dd> <table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"></td><td valign="top"><em>ioplug</em> </td><td>the ioplug handle </td></tr> <tr><td valign="top"></td><td valign="top"><em>name</em> </td><td>name of PCM </td></tr> <tr><td valign="top"></td><td valign="top"><em>stream</em> </td><td>stream direction </td></tr> <tr><td valign="top"></td><td valign="top"><em>mode</em> </td><td>PCM open mode </td></tr> </table> </dd> </dl> <dl class="return"><dt><b>Returns:</b></dt><dd>0 if successful, or a negative error code</dd></dl> <p>Creates the ioplug instance.</p> <p>The callback is the mandatory field of ioplug handle. At least, start, stop and pointer callbacks must be set before calling this function. </p> </div> </div> <a class="anchor" id="ga286ec116983166de889f0268a2c666ef"></a><!-- doxytag: member="pcm_ioplug.h::snd_pcm_ioplug_delete" ref="ga286ec116983166de889f0268a2c666ef" args="(snd_pcm_ioplug_t *io)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">int snd_pcm_ioplug_delete </td> <td>(</td> <td class="paramtype">snd_pcm_ioplug_t * </td> <td class="paramname"> <em>ioplug</em></td> <td> ) </td> <td></td> </tr> </table> </div> <div class="memdoc"> <p>Delete the ioplug instance. </p> <dl><dt><b>Parameters:</b></dt><dd> <table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"></td><td valign="top"><em>ioplug</em> </td><td>the ioplug handle </td></tr> </table> </dd> </dl> <dl class="return"><dt><b>Returns:</b></dt><dd>0 if successful, or a negative error code </dd></dl> </div> </div> <a class="anchor" id="gac3b666ff286745c9eb24de3e3930970a"></a><!-- doxytag: member="pcm_ioplug.h::snd_pcm_ioplug_mmap_areas" ref="gac3b666ff286745c9eb24de3e3930970a" args="(snd_pcm_ioplug_t *ioplug)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="structsnd__pcm__channel__area__t.html">snd_pcm_channel_area_t</a>* snd_pcm_ioplug_mmap_areas </td> <td>(</td> <td class="paramtype">snd_pcm_ioplug_t * </td> <td class="paramname"> <em>ioplug</em></td> <td> ) </td> <td></td> </tr> </table> </div> <div class="memdoc"> <p>Get mmap area of ioplug. </p> <dl><dt><b>Parameters:</b></dt><dd> <table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"></td><td valign="top"><em>ioplug</em> </td><td>the ioplug handle </td></tr> </table> </dd> </dl> <dl class="return"><dt><b>Returns:</b></dt><dd>the mmap channel areas if available, or NULL</dd></dl> <p>Returns the mmap channel areas if available. When mmap_rw field is not set, this function always returns NULL. </p> </div> </div> <a class="anchor" id="gad74355dfaa56fae80d49181c83eeecc4"></a><!-- doxytag: member="pcm_ioplug.h::snd_pcm_ioplug_params_reset" ref="gad74355dfaa56fae80d49181c83eeecc4" args="(snd_pcm_ioplug_t *io)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">void snd_pcm_ioplug_params_reset </td> <td>(</td> <td class="paramtype">snd_pcm_ioplug_t * </td> <td class="paramname"> <em>ioplug</em></td> <td> ) </td> <td></td> </tr> </table> </div> <div class="memdoc"> <p>Reset ioplug parameters. </p> <dl><dt><b>Parameters:</b></dt><dd> <table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"></td><td valign="top"><em>ioplug</em> </td><td>the ioplug handle</td></tr> </table> </dd> </dl> <p>Resets the all parameters for the given ioplug handle. </p> </div> </div> <a class="anchor" id="gab223893226ecf78f675c89959a8c421a"></a><!-- doxytag: member="pcm_ioplug.h::snd_pcm_ioplug_reinit_status" ref="gab223893226ecf78f675c89959a8c421a" args="(snd_pcm_ioplug_t *ioplug)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">int snd_pcm_ioplug_reinit_status </td> <td>(</td> <td class="paramtype">snd_pcm_ioplug_t * </td> <td class="paramname"> <em>ioplug</em></td> <td> ) </td> <td></td> </tr> </table> </div> <div class="memdoc"> <p>Reinitialize the poll and mmap status. </p> <dl><dt><b>Parameters:</b></dt><dd> <table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"></td><td valign="top"><em>ioplug</em> </td><td>the ioplug handle </td></tr> </table> </dd> </dl> <dl class="return"><dt><b>Returns:</b></dt><dd>0 if successful, or a negative error code</dd></dl> <p>Reinitializes the poll and the mmap status of the PCM. Call this function to propagate the status change in the ioplug instance to its PCM internals. </p> </div> </div> <a class="anchor" id="ga7d713552fb846ccdf4b7ec6a9fc1b562"></a><!-- doxytag: member="pcm_ioplug.h::snd_pcm_ioplug_set_param_list" ref="ga7d713552fb846ccdf4b7ec6a9fc1b562" args="(snd_pcm_ioplug_t *io, int type, unsigned int num_list, const unsigned int *list)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">int snd_pcm_ioplug_set_param_list </td> <td>(</td> <td class="paramtype">snd_pcm_ioplug_t * </td> <td class="paramname"> <em>ioplug</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">int </td> <td class="paramname"> <em>type</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">unsigned int </td> <td class="paramname"> <em>num_list</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">const unsigned int * </td> <td class="paramname"> <em>list</em></td><td> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td><td></td> </tr> </table> </div> <div class="memdoc"> <p>Set parameter as the list. </p> <dl><dt><b>Parameters:</b></dt><dd> <table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"></td><td valign="top"><em>ioplug</em> </td><td>the ioplug handle </td></tr> <tr><td valign="top"></td><td valign="top"><em>type</em> </td><td>parameter type </td></tr> <tr><td valign="top"></td><td valign="top"><em>num_list</em> </td><td>number of available values </td></tr> <tr><td valign="top"></td><td valign="top"><em>list</em> </td><td>the list of available values </td></tr> </table> </dd> </dl> <dl class="return"><dt><b>Returns:</b></dt><dd>0 if successful, or a negative error code</dd></dl> <p>Sets the parameter as the list. The available values of the given parameter type is restricted to the ones of the given list. </p> </div> </div> <a class="anchor" id="gab62d470b02661214319196394b55fb37"></a><!-- doxytag: member="pcm_ioplug.h::snd_pcm_ioplug_set_param_minmax" ref="gab62d470b02661214319196394b55fb37" args="(snd_pcm_ioplug_t *io, int type, unsigned int min, unsigned int max)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">int snd_pcm_ioplug_set_param_minmax </td> <td>(</td> <td class="paramtype">snd_pcm_ioplug_t * </td> <td class="paramname"> <em>ioplug</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">int </td> <td class="paramname"> <em>type</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">unsigned int </td> <td class="paramname"> <em>min</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">unsigned int </td> <td class="paramname"> <em>max</em></td><td> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td><td></td> </tr> </table> </div> <div class="memdoc"> <p>Set parameter as the min/max values. </p> <dl><dt><b>Parameters:</b></dt><dd> <table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"></td><td valign="top"><em>ioplug</em> </td><td>the ioplug handle </td></tr> <tr><td valign="top"></td><td valign="top"><em>type</em> </td><td>parameter type </td></tr> <tr><td valign="top"></td><td valign="top"><em>min</em> </td><td>the minimum value </td></tr> <tr><td valign="top"></td><td valign="top"><em>max</em> </td><td>the maximum value </td></tr> </table> </dd> </dl> <dl class="return"><dt><b>Returns:</b></dt><dd>0 if successful, or a negative error code</dd></dl> <p>Sets the parameter as the min/max values. The available values of the given parameter type is restricted between the given minimum and maximum values. </p> </div> </div> <a class="anchor" id="ga65feed7caf26f07aad0c722fc61fe751"></a><!-- doxytag: member="pcm_ioplug.h::snd_pcm_ioplug_set_state" ref="ga65feed7caf26f07aad0c722fc61fe751" args="(snd_pcm_ioplug_t *ioplug, snd_pcm_state_t state)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">int snd_pcm_ioplug_set_state </td> <td>(</td> <td class="paramtype">snd_pcm_ioplug_t * </td> <td class="paramname"> <em>ioplug</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"><a class="el" href="group___p_c_m.html#ga61ac499cb3701ce536d4d83725908860">snd_pcm_state_t</a> </td> <td class="paramname"> <em>state</em></td><td> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td><td></td> </tr> </table> </div> <div class="memdoc"> <p>Change the ioplug PCM status. </p> <dl><dt><b>Parameters:</b></dt><dd> <table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"></td><td valign="top"><em>ioplug</em> </td><td>the ioplug handle </td></tr> <tr><td valign="top"></td><td valign="top"><em>state</em> </td><td>the PCM status </td></tr> </table> </dd> </dl> <dl class="return"><dt><b>Returns:</b></dt><dd>zero if successful or a negative error code</dd></dl> <p>Changes the PCM status of the ioplug to the given value. 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