<?xml version="1.0" encoding="ANSI_X3.4-1968" standalone="no"?> <!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/html; charset=ANSI_X3.4-1968" /><title>snd_pcm_period_elapsed</title><meta name="generator" content="DocBook XSL Stylesheets V1.76.1" /><link rel="home" href="index.html" title="The ALSA Driver API" /><link rel="up" href="ch02.html#id3113154" title="PCM Core" /><link rel="prev" href="API-snd-pcm-lib-ioctl.html" title="snd_pcm_lib_ioctl" /><link rel="next" href="API-snd-pcm-stop.html" title="snd_pcm_stop" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>snd_pcm_period_elapsed</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-snd-pcm-lib-ioctl.html">Prev</a> </td><th width="60%" align="center">PCM Core</th><td width="20%" align="right"> <a accesskey="n" href="API-snd-pcm-stop.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="snd_pcm_period_elapsed"><a id="API-snd-pcm-period-elapsed"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>snd_pcm_period_elapsed — update the pcm status for the next period </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">void <strong>fsfuncsnd_pcm_period_elapsed </strong>(</code></td><td>struct snd_pcm_substream * <var class="pdparam">substream</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id3116755"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>substream</code></em></span></dt><dd><p> the pcm substream instance </p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id3116781"></a><h2>Description</h2><p> This function is called from the interrupt handler when the PCM has processed the period size. It will update the current pointer, wake up sleepers, etc. </p><p> Even if more than one periods have elapsed since the last call, you have to call this only once. </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-snd-pcm-lib-ioctl.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch02.html#id3113154">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="API-snd-pcm-stop.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>snd_pcm_lib_ioctl</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span>snd_pcm_stop</span></td></tr></table></div></body></html>