1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>PCM Format Helpers</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><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="API-pcm-format-to-bits.html" title="pcm_format_to_bits"><link rel="next" href="API-snd-pcm-format-signed.html" title="snd_pcm_format_signed"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">PCM Format Helpers</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-pcm-format-to-bits.html">Prev</a> </td><th width="60%" align="center">Chapter 2. PCM API</th><td width="20%" align="right"> <a accesskey="n" href="API-snd-pcm-format-signed.html">Next</a></td></tr></table><hr></div><div class="sect1"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp1094170524"></a>PCM Format Helpers</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="refentrytitle"><a href="API-snd-pcm-format-signed.html"><span class="phrase">snd_pcm_format_signed</span></a></span><span class="refpurpose"> — 2 Check the PCM format is signed linear 3 </span></dt><dt><span class="refentrytitle"><a href="API-snd-pcm-format-unsigned.html"><span class="phrase">snd_pcm_format_unsigned</span></a></span><span class="refpurpose"> — 4 Check the PCM format is unsigned linear 5 </span></dt><dt><span class="refentrytitle"><a href="API-snd-pcm-format-linear.html"><span class="phrase">snd_pcm_format_linear</span></a></span><span class="refpurpose"> — 6 Check the PCM format is linear 7 </span></dt><dt><span class="refentrytitle"><a href="API-snd-pcm-format-little-endian.html"><span class="phrase">snd_pcm_format_little_endian</span></a></span><span class="refpurpose"> — 8 Check the PCM format is little-endian 9 </span></dt><dt><span class="refentrytitle"><a href="API-snd-pcm-format-big-endian.html"><span class="phrase">snd_pcm_format_big_endian</span></a></span><span class="refpurpose"> — 10 Check the PCM format is big-endian 11 </span></dt><dt><span class="refentrytitle"><a href="API-snd-pcm-format-width.html"><span class="phrase">snd_pcm_format_width</span></a></span><span class="refpurpose"> — 12 return the bit-width of the format 13 </span></dt><dt><span class="refentrytitle"><a href="API-snd-pcm-format-physical-width.html"><span class="phrase">snd_pcm_format_physical_width</span></a></span><span class="refpurpose"> — 14 return the physical bit-width of the format 15 </span></dt><dt><span class="refentrytitle"><a href="API-snd-pcm-format-size.html"><span class="phrase">snd_pcm_format_size</span></a></span><span class="refpurpose"> — 16 return the byte size of samples on the given format 17 </span></dt><dt><span class="refentrytitle"><a href="API-snd-pcm-format-silence-64.html"><span class="phrase">snd_pcm_format_silence_64</span></a></span><span class="refpurpose"> — 18 return the silent data in 8 bytes array 19 </span></dt><dt><span class="refentrytitle"><a href="API-snd-pcm-format-set-silence.html"><span class="phrase">snd_pcm_format_set_silence</span></a></span><span class="refpurpose"> — 20 set the silence data on the buffer 21 </span></dt><dt><span class="refentrytitle"><a href="API-snd-pcm-limit-hw-rates.html"><span class="phrase">snd_pcm_limit_hw_rates</span></a></span><span class="refpurpose"> — 22 determine rate_min/rate_max fields 23 </span></dt><dt><span class="refentrytitle"><a href="API-snd-pcm-rate-to-rate-bit.html"><span class="phrase">snd_pcm_rate_to_rate_bit</span></a></span><span class="refpurpose"> — 24 converts sample rate to SNDRV_PCM_RATE_xxx bit 25 </span></dt><dt><span class="refentrytitle"><a href="API-snd-pcm-rate-bit-to-rate.html"><span class="phrase">snd_pcm_rate_bit_to_rate</span></a></span><span class="refpurpose"> — 26 converts SNDRV_PCM_RATE_xxx bit to sample rate 27 </span></dt><dt><span class="refentrytitle"><a href="API-snd-pcm-rate-mask-intersect.html"><span class="phrase">snd_pcm_rate_mask_intersect</span></a></span><span class="refpurpose"> — 28 computes the intersection between two rate masks 29 </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="API-pcm-format-to-bits.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="API-snd-pcm-format-signed.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">pcm_format_to_bits</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span class="phrase">snd_pcm_format_signed</span></td></tr></table></div></body></html> 30