<!-- 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: Simple setup functions</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>Simple setup functions<br/> <small> [<a class="el" href="group___p_c_m.html">PCM Interface</a>]</small> </h1><table border="0" cellpadding="0" cellspacing="0"> <tr><td colspan="2"><h2>Files</h2></td></tr> <tr><td class="memItemLeft" align="right" valign="top">file </td><td class="memItemRight" valign="bottom"><a class="el" href="pcm__simple_8c.html">pcm_simple.c</a></td></tr> <p><tr><td class="mdescLeft"> </td><td class="mdescRight"><p>PCM Simple Interface. </p> <br/></td></tr> </p> <tr><td colspan="2"><h2>Enumerations</h2></td></tr> <tr><td class="memItemLeft" align="right" valign="top">enum </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___simple.html#ga0c8bcbf9cc83e8b0edaa501b15ff8ba9">snd_spcm_latency_t</a> { <a class="el" href="group___p_c_m___simple.html#gga0c8bcbf9cc83e8b0edaa501b15ff8ba9a51386f1133cba0e74aad6fbd8f6cf714">SND_SPCM_LATENCY_STANDARD</a> = 0, <a class="el" href="group___p_c_m___simple.html#gga0c8bcbf9cc83e8b0edaa501b15ff8ba9ad392df38379992a4474f24fa2d0a7146">SND_SPCM_LATENCY_MEDIUM</a>, <a class="el" href="group___p_c_m___simple.html#gga0c8bcbf9cc83e8b0edaa501b15ff8ba9aa29ff6c1b58c9b050df6ae575229cd9c">SND_SPCM_LATENCY_REALTIME</a> }</td></tr> <tr><td class="memItemLeft" align="right" valign="top">enum </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___simple.html#gaf89aba8106b8cc46e9f18d91268ec5ba">snd_spcm_xrun_type_t</a> { <a class="el" href="group___p_c_m___simple.html#ggaf89aba8106b8cc46e9f18d91268ec5baa7ef0dcc10a5e328bc78aa472d882f1f8">SND_SPCM_XRUN_IGNORE</a> = 0, <a class="el" href="group___p_c_m___simple.html#ggaf89aba8106b8cc46e9f18d91268ec5baa716f9883b17fe11b35d162a6ff14a96a">SND_SPCM_XRUN_STOP</a> }</td></tr> <tr><td class="memItemLeft" align="right" valign="top">enum </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___simple.html#ga6ed7a5a0762c198cb90ee48fb477b092">snd_spcm_duplex_type_t</a> { <a class="el" href="group___p_c_m___simple.html#gga6ed7a5a0762c198cb90ee48fb477b092a1baaaad19888ceeaf728364362274e0b">SND_SPCM_DUPLEX_LIBERAL</a> = 0, <a class="el" href="group___p_c_m___simple.html#gga6ed7a5a0762c198cb90ee48fb477b092a3efcb3f575fd6b86c0198dc87484f7c9">SND_SPCM_DUPLEX_PEDANTIC</a> }</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___simple.html#ga5c55688bfe990821798936c20cd11ca5">snd_spcm_init</a> (<a class="el" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> *pcm, unsigned int rate, unsigned int channels, <a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> format, <a class="el" href="group___p_c_m.html#ga1e5fe73a6bdf881e2f91921d5e5327c7">snd_pcm_subformat_t</a> subformat, <a class="el" href="group___p_c_m___simple.html#ga0c8bcbf9cc83e8b0edaa501b15ff8ba9">snd_spcm_latency_t</a> latency, <a class="el" href="group___p_c_m.html#ga661221ba5e8f1d6eaf4ab8e2da57cc1a">snd_pcm_access_t</a> _access, <a class="el" href="group___p_c_m___simple.html#gaf89aba8106b8cc46e9f18d91268ec5ba">snd_spcm_xrun_type_t</a> xrun_type)</td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">Set up a simple PCM. <a href="#ga5c55688bfe990821798936c20cd11ca5"></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___simple.html#ga148a05b14b083d9c6ded79dd6bfd7fdd">snd_spcm_init_duplex</a> (<a class="el" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> *playback_pcm, <a class="el" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> *capture_pcm, unsigned int rate, unsigned int channels, <a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> format, <a class="el" href="group___p_c_m.html#ga1e5fe73a6bdf881e2f91921d5e5327c7">snd_pcm_subformat_t</a> subformat, <a class="el" href="group___p_c_m___simple.html#ga0c8bcbf9cc83e8b0edaa501b15ff8ba9">snd_spcm_latency_t</a> latency, <a class="el" href="group___p_c_m.html#ga661221ba5e8f1d6eaf4ab8e2da57cc1a">snd_pcm_access_t</a> _access, <a class="el" href="group___p_c_m___simple.html#gaf89aba8106b8cc46e9f18d91268ec5ba">snd_spcm_xrun_type_t</a> xrun_type, <a class="el" href="group___p_c_m___simple.html#ga6ed7a5a0762c198cb90ee48fb477b092">snd_spcm_duplex_type_t</a> duplex_type)</td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">Initialize simple PCMs in the duplex mode. <a href="#ga148a05b14b083d9c6ded79dd6bfd7fdd"></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___simple.html#gab6ee6daf2b83bdebf6cf6355c0365885">snd_spcm_init_get_params</a> (<a class="el" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> *pcm, unsigned int *rate, <a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> *buffer_size, <a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> *period_size)</td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">Get the set up of simple PCM. <a href="#gab6ee6daf2b83bdebf6cf6355c0365885"></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>Enumeration Type Documentation</h2> <a class="anchor" id="ga6ed7a5a0762c198cb90ee48fb477b092"></a><!-- doxytag: member="pcm.h::snd_spcm_duplex_type_t" ref="ga6ed7a5a0762c198cb90ee48fb477b092" args="" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">enum <a class="el" href="group___p_c_m___simple.html#ga6ed7a5a0762c198cb90ee48fb477b092">snd_spcm_duplex_type_t</a></td> </tr> </table> </div> <div class="memdoc"> <p>Simple PCM duplex type </p> <dl><dt><b>Enumerator: </b></dt><dd><table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"><em><a class="anchor" id="gga6ed7a5a0762c198cb90ee48fb477b092a1baaaad19888ceeaf728364362274e0b"></a><!-- doxytag: member="SND_SPCM_DUPLEX_LIBERAL" ref="gga6ed7a5a0762c198cb90ee48fb477b092a1baaaad19888ceeaf728364362274e0b" args="" -->SND_SPCM_DUPLEX_LIBERAL</em> </td><td> <p>liberal duplex - the buffer and period sizes might not match </p> </td></tr> <tr><td valign="top"><em><a class="anchor" id="gga6ed7a5a0762c198cb90ee48fb477b092a3efcb3f575fd6b86c0198dc87484f7c9"></a><!-- doxytag: member="SND_SPCM_DUPLEX_PEDANTIC" ref="gga6ed7a5a0762c198cb90ee48fb477b092a3efcb3f575fd6b86c0198dc87484f7c9" args="" -->SND_SPCM_DUPLEX_PEDANTIC</em> </td><td> <p>pedantic duplex - the buffer and period sizes MUST match </p> </td></tr> </table> </dd> </dl> </div> </div> <a class="anchor" id="ga0c8bcbf9cc83e8b0edaa501b15ff8ba9"></a><!-- doxytag: member="pcm.h::snd_spcm_latency_t" ref="ga0c8bcbf9cc83e8b0edaa501b15ff8ba9" args="" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">enum <a class="el" href="group___p_c_m___simple.html#ga0c8bcbf9cc83e8b0edaa501b15ff8ba9">snd_spcm_latency_t</a></td> </tr> </table> </div> <div class="memdoc"> <p>Simple PCM latency type </p> <dl><dt><b>Enumerator: </b></dt><dd><table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"><em><a class="anchor" id="gga0c8bcbf9cc83e8b0edaa501b15ff8ba9a51386f1133cba0e74aad6fbd8f6cf714"></a><!-- doxytag: member="SND_SPCM_LATENCY_STANDARD" ref="gga0c8bcbf9cc83e8b0edaa501b15ff8ba9a51386f1133cba0e74aad6fbd8f6cf714" args="" -->SND_SPCM_LATENCY_STANDARD</em> </td><td> <p>standard latency - for standard playback or capture (estimated latency in one direction 350ms) </p> </td></tr> <tr><td valign="top"><em><a class="anchor" id="gga0c8bcbf9cc83e8b0edaa501b15ff8ba9ad392df38379992a4474f24fa2d0a7146"></a><!-- doxytag: member="SND_SPCM_LATENCY_MEDIUM" ref="gga0c8bcbf9cc83e8b0edaa501b15ff8ba9ad392df38379992a4474f24fa2d0a7146" args="" -->SND_SPCM_LATENCY_MEDIUM</em> </td><td> <p>medium latency - software phones etc. (estimated latency in one direction maximally 25ms </p> </td></tr> <tr><td valign="top"><em><a class="anchor" id="gga0c8bcbf9cc83e8b0edaa501b15ff8ba9aa29ff6c1b58c9b050df6ae575229cd9c"></a><!-- doxytag: member="SND_SPCM_LATENCY_REALTIME" ref="gga0c8bcbf9cc83e8b0edaa501b15ff8ba9aa29ff6c1b58c9b050df6ae575229cd9c" args="" -->SND_SPCM_LATENCY_REALTIME</em> </td><td> <p>realtime latency - realtime applications (effect processors etc.) (estimated latency in one direction 5ms and better) </p> </td></tr> </table> </dd> </dl> </div> </div> <a class="anchor" id="gaf89aba8106b8cc46e9f18d91268ec5ba"></a><!-- doxytag: member="pcm.h::snd_spcm_xrun_type_t" ref="gaf89aba8106b8cc46e9f18d91268ec5ba" args="" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">enum <a class="el" href="group___p_c_m___simple.html#gaf89aba8106b8cc46e9f18d91268ec5ba">snd_spcm_xrun_type_t</a></td> </tr> </table> </div> <div class="memdoc"> <p>Simple PCM xrun type </p> <dl><dt><b>Enumerator: </b></dt><dd><table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"><em><a class="anchor" id="ggaf89aba8106b8cc46e9f18d91268ec5baa7ef0dcc10a5e328bc78aa472d882f1f8"></a><!-- doxytag: member="SND_SPCM_XRUN_IGNORE" ref="ggaf89aba8106b8cc46e9f18d91268ec5baa7ef0dcc10a5e328bc78aa472d882f1f8" args="" -->SND_SPCM_XRUN_IGNORE</em> </td><td> <p>driver / library will ignore all xruns, the stream runs forever </p> </td></tr> <tr><td valign="top"><em><a class="anchor" id="ggaf89aba8106b8cc46e9f18d91268ec5baa716f9883b17fe11b35d162a6ff14a96a"></a><!-- doxytag: member="SND_SPCM_XRUN_STOP" ref="ggaf89aba8106b8cc46e9f18d91268ec5baa716f9883b17fe11b35d162a6ff14a96a" args="" -->SND_SPCM_XRUN_STOP</em> </td><td> <p>driver / library stops the stream when an xrun occurs </p> </td></tr> </table> </dd> </dl> </div> </div> <hr/><h2>Function Documentation</h2> <a class="anchor" id="ga5c55688bfe990821798936c20cd11ca5"></a><!-- doxytag: member="pcm.h::snd_spcm_init" ref="ga5c55688bfe990821798936c20cd11ca5" args="(snd_pcm_t *pcm, unsigned int rate, unsigned int channels, snd_pcm_format_t format, snd_pcm_subformat_t subformat, snd_spcm_latency_t latency, snd_pcm_access_t _access, snd_spcm_xrun_type_t xrun_type)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">int snd_spcm_init </td> <td>(</td> <td class="paramtype"><a class="el" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> * </td> <td class="paramname"> <em>pcm</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">unsigned int </td> <td class="paramname"> <em>rate</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">unsigned int </td> <td class="paramname"> <em>channels</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"><a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> </td> <td class="paramname"> <em>format</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"><a class="el" href="group___p_c_m.html#ga1e5fe73a6bdf881e2f91921d5e5327c7">snd_pcm_subformat_t</a> </td> <td class="paramname"> <em>subformat</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"><a class="el" href="group___p_c_m___simple.html#ga0c8bcbf9cc83e8b0edaa501b15ff8ba9">snd_spcm_latency_t</a> </td> <td class="paramname"> <em>latency</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"><a class="el" href="group___p_c_m.html#ga661221ba5e8f1d6eaf4ab8e2da57cc1a">snd_pcm_access_t</a> </td> <td class="paramname"> <em>access</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"><a class="el" href="group___p_c_m___simple.html#gaf89aba8106b8cc46e9f18d91268ec5ba">snd_spcm_xrun_type_t</a> </td> <td class="paramname"> <em>xrun_type</em></td><td> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td><td></td> </tr> </table> </div> <div class="memdoc"> <p>Set up a simple PCM. </p> <dl><dt><b>Parameters:</b></dt><dd> <table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"></td><td valign="top"><em>pcm</em> </td><td>PCM handle </td></tr> <tr><td valign="top"></td><td valign="top"><em>rate</em> </td><td>Sample rate </td></tr> <tr><td valign="top"></td><td valign="top"><em>channels</em> </td><td>Number of channels </td></tr> <tr><td valign="top"></td><td valign="top"><em>format</em> </td><td>PCM format </td></tr> <tr><td valign="top"></td><td valign="top"><em>subformat</em> </td><td>PCM subformat </td></tr> <tr><td valign="top"></td><td valign="top"><em>latency</em> </td><td>Latency type </td></tr> <tr><td valign="top"></td><td valign="top"><em>access</em> </td><td>PCM acceess type </td></tr> <tr><td valign="top"></td><td valign="top"><em>xrun_type</em> </td><td>XRUN type </td></tr> </table> </dd> </dl> <dl class="return"><dt><b>Returns:</b></dt><dd>0 if successful, or a negative error code</dd></dl> <dl class="warning"><dt><b>Warning:</b></dt><dd>The simple PCM API may be broken in the current release. </dd></dl> </div> </div> <a class="anchor" id="ga148a05b14b083d9c6ded79dd6bfd7fdd"></a><!-- doxytag: member="pcm.h::snd_spcm_init_duplex" ref="ga148a05b14b083d9c6ded79dd6bfd7fdd" args="(snd_pcm_t *playback_pcm, snd_pcm_t *capture_pcm, unsigned int rate, unsigned int channels, snd_pcm_format_t format, snd_pcm_subformat_t subformat, snd_spcm_latency_t latency, snd_pcm_access_t _access, snd_spcm_xrun_type_t xrun_type, snd_spcm_duplex_type_t duplex_type)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">int snd_spcm_init_duplex </td> <td>(</td> <td class="paramtype"><a class="el" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> * </td> <td class="paramname"> <em>playback_pcm</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"><a class="el" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> * </td> <td class="paramname"> <em>capture_pcm</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">unsigned int </td> <td class="paramname"> <em>rate</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">unsigned int </td> <td class="paramname"> <em>channels</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"><a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> </td> <td class="paramname"> <em>format</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"><a class="el" href="group___p_c_m.html#ga1e5fe73a6bdf881e2f91921d5e5327c7">snd_pcm_subformat_t</a> </td> <td class="paramname"> <em>subformat</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"><a class="el" href="group___p_c_m___simple.html#ga0c8bcbf9cc83e8b0edaa501b15ff8ba9">snd_spcm_latency_t</a> </td> <td class="paramname"> <em>latency</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"><a class="el" href="group___p_c_m.html#ga661221ba5e8f1d6eaf4ab8e2da57cc1a">snd_pcm_access_t</a> </td> <td class="paramname"> <em>access</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"><a class="el" href="group___p_c_m___simple.html#gaf89aba8106b8cc46e9f18d91268ec5ba">snd_spcm_xrun_type_t</a> </td> <td class="paramname"> <em>xrun_type</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"><a class="el" href="group___p_c_m___simple.html#ga6ed7a5a0762c198cb90ee48fb477b092">snd_spcm_duplex_type_t</a> </td> <td class="paramname"> <em>duplex_type</em></td><td> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td><td></td> </tr> </table> </div> <div class="memdoc"> <p>Initialize simple PCMs in the duplex mode. </p> <dl><dt><b>Parameters:</b></dt><dd> <table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"></td><td valign="top"><em>playback_pcm</em> </td><td>PCM handle for playback </td></tr> <tr><td valign="top"></td><td valign="top"><em>capture_pcm</em> </td><td>PCM handle for capture </td></tr> <tr><td valign="top"></td><td valign="top"><em>rate</em> </td><td>Sample rate </td></tr> <tr><td valign="top"></td><td valign="top"><em>channels</em> </td><td>Number of channels </td></tr> <tr><td valign="top"></td><td valign="top"><em>format</em> </td><td>PCM format </td></tr> <tr><td valign="top"></td><td valign="top"><em>subformat</em> </td><td>PCM subformat </td></tr> <tr><td valign="top"></td><td valign="top"><em>latency</em> </td><td>Latency type </td></tr> <tr><td valign="top"></td><td valign="top"><em>access</em> </td><td>PCM acceess type </td></tr> <tr><td valign="top"></td><td valign="top"><em>xrun_type</em> </td><td>XRUN type </td></tr> <tr><td valign="top"></td><td valign="top"><em>duplex_type</em> </td><td>Duplex 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> <dl class="warning"><dt><b>Warning:</b></dt><dd>The simple PCM API may be broken in the current release. </dd></dl> </div> </div> <a class="anchor" id="gab6ee6daf2b83bdebf6cf6355c0365885"></a><!-- doxytag: member="pcm.h::snd_spcm_init_get_params" ref="gab6ee6daf2b83bdebf6cf6355c0365885" args="(snd_pcm_t *pcm, unsigned int *rate, snd_pcm_uframes_t *buffer_size, snd_pcm_uframes_t *period_size)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">int snd_spcm_init_get_params </td> <td>(</td> <td class="paramtype"><a class="el" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> * </td> <td class="paramname"> <em>pcm</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">unsigned int * </td> <td class="paramname"> <em>rate</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"><a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> * </td> <td class="paramname"> <em>buffer_size</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"><a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> * </td> <td class="paramname"> <em>period_size</em></td><td> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td><td></td> </tr> </table> </div> <div class="memdoc"> <p>Get the set up of simple PCM. </p> <dl><dt><b>Parameters:</b></dt><dd> <table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"></td><td valign="top"><em>pcm</em> </td><td>PCM handle </td></tr> <tr><td valign="top"></td><td valign="top"><em>rate</em> </td><td>Pointer to store the current sample rate </td></tr> <tr><td valign="top"></td><td valign="top"><em>buffer_size</em> </td><td>Pointer to store the current buffer size </td></tr> <tr><td valign="top"></td><td valign="top"><em>period_size</em> </td><td>Pointer to store the current period size </td></tr> </table> </dd> </dl> <dl class="return"><dt><b>Returns:</b></dt><dd>0 if successful, or a negative error code</dd></dl> <dl class="warning"><dt><b>Warning:</b></dt><dd>The simple PCM API may be broken in the current release. </dd></dl> </div> </div> </div> <!--- window showing the filter options --> <div id="MSearchSelectWindow" onmouseover="return searchBox.OnSearchSelectShow()" 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