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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>PCM Memory Management</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="The ALSA Driver API" /><link rel="up" href="ch02.html" title="Chapter 2. PCM API" /><link rel="prev" href="re60.html" title="snd_pcm_rate_to_rate_bit" /><link rel="next" href="re61.html" title="snd_pcm_lib_preallocate_free_for_all" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">PCM Memory Management</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re60.html">Prev</a> </td><th width="60%" align="center">Chapter 2. PCM API</th><td width="20%" align="right"> <a accesskey="n" href="re61.html">Next</a></td></tr></table><hr /></div><div class="sect1" title="PCM Memory Management"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="id2711890"></a>PCM Memory Management</h2></div></div></div><div class="toc"><dl><dt><span class="refentrytitle"><a href="re61.html"><span>snd_pcm_lib_preallocate_free_for_all</span></a></span><span class="refpurpose"> —
release all pre-allocated buffers on the pcm
</span></dt><dt><span class="refentrytitle"><a href="re62.html"><span>snd_pcm_lib_preallocate_pages</span></a></span><span class="refpurpose"> —
pre-allocation for the given DMA type
</span></dt><dt><span class="refentrytitle"><a href="re63.html"><span>snd_pcm_lib_preallocate_pages_for_all</span></a></span><span class="refpurpose"> —
pre-allocation for continous memory type (all substreams)
</span></dt><dt><span class="refentrytitle"><a href="re64.html"><span>snd_pcm_sgbuf_ops_page</span></a></span><span class="refpurpose"> —
get the page struct at the given offset
</span></dt><dt><span class="refentrytitle"><a href="re65.html"><span>snd_pcm_lib_malloc_pages</span></a></span><span class="refpurpose"> —
allocate the DMA buffer
</span></dt><dt><span class="refentrytitle"><a href="re66.html"><span>snd_pcm_lib_free_pages</span></a></span><span class="refpurpose"> —
release the allocated DMA buffer.
</span></dt></dl></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re60.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch02.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re61.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>snd_pcm_rate_to_rate_bit</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_lib_preallocate_free_for_all</span></td></tr></table></div></body></html>
