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<!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="X-UA-Compatible" content="IE=Edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>21.9. sndhdr — Determine type of sound file — Python 2.7.16 documentation</title> <link rel="stylesheet" href="../_static/classic.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript" id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <script type="text/javascript" src="../_static/sidebar.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python 2.7.16 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="next" title="21.10. ossaudiodev — Access to OSS-compatible audio devices" href="ossaudiodev.html" /> <link rel="prev" title="21.8. imghdr — Determine the type of an image" href="imghdr.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <link rel="canonical" href="https://docs.python.org/2/library/sndhdr.html" /> <script type="text/javascript" src="../_static/copybutton.js"></script> </head><body> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="ossaudiodev.html" title="21.10. ossaudiodev — Access to OSS-compatible audio devices" accesskey="N">next</a> |</li> <li class="right" > <a href="imghdr.html" title="21.8. imghdr — Determine the type of an image" accesskey="P">previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.16 documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> »</li> <li class="nav-item nav-item-2"><a href="mm.html" accesskey="U">21. Multimedia Services</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <div class="section" id="module-sndhdr"> <span id="sndhdr-determine-type-of-sound-file"></span><h1>21.9. <a class="reference internal" href="#module-sndhdr" title="sndhdr: Determine type of a sound file."><code class="xref py py-mod docutils literal notranslate"><span class="pre">sndhdr</span></code></a> — Determine type of sound file<a class="headerlink" href="#module-sndhdr" title="Permalink to this headline">¶</a></h1> <p id="index-0"><strong>Source code:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/2.7/Lib/sndhdr.py">Lib/sndhdr.py</a></p> <hr class="docutils" /> <p>The <a class="reference internal" href="#module-sndhdr" title="sndhdr: Determine type of a sound file."><code class="xref py py-mod docutils literal notranslate"><span class="pre">sndhdr</span></code></a> provides utility functions which attempt to determine the type of sound data which is in a file. When these functions are able to determine what type of sound data is stored in a file, they return a tuple <code class="docutils literal notranslate"><span class="pre">(type,</span> <span class="pre">sampling_rate,</span> <span class="pre">channels,</span> <span class="pre">frames,</span> <span class="pre">bits_per_sample)</span></code>. The value for <em>type</em> indicates the data type and will be one of the strings <code class="docutils literal notranslate"><span class="pre">'aifc'</span></code>, <code class="docutils literal notranslate"><span class="pre">'aiff'</span></code>, <code class="docutils literal notranslate"><span class="pre">'au'</span></code>, <code class="docutils literal notranslate"><span class="pre">'hcom'</span></code>, <code class="docutils literal notranslate"><span class="pre">'sndr'</span></code>, <code class="docutils literal notranslate"><span class="pre">'sndt'</span></code>, <code class="docutils literal notranslate"><span class="pre">'voc'</span></code>, <code class="docutils literal notranslate"><span class="pre">'wav'</span></code>, <code class="docutils literal notranslate"><span class="pre">'8svx'</span></code>, <code class="docutils literal notranslate"><span class="pre">'sb'</span></code>, <code class="docutils literal notranslate"><span class="pre">'ub'</span></code>, or <code class="docutils literal notranslate"><span class="pre">'ul'</span></code>. The <em>sampling_rate</em> will be either the actual value or <code class="docutils literal notranslate"><span class="pre">0</span></code> if unknown or difficult to decode. Similarly, <em>channels</em> will be either the number of channels or <code class="docutils literal notranslate"><span class="pre">0</span></code> if it cannot be determined or if the value is difficult to decode. The value for <em>frames</em> will be either the number of frames or <code class="docutils literal notranslate"><span class="pre">-1</span></code>. The last item in the tuple, <em>bits_per_sample</em>, will either be the sample size in bits or <code class="docutils literal notranslate"><span class="pre">'A'</span></code> for A-LAW or <code class="docutils literal notranslate"><span class="pre">'U'</span></code> for u-LAW.</p> <dl class="function"> <dt id="sndhdr.what"> <code class="descclassname">sndhdr.</code><code class="descname">what</code><span class="sig-paren">(</span><em>filename</em><span class="sig-paren">)</span><a class="headerlink" href="#sndhdr.what" title="Permalink to this definition">¶</a></dt> <dd><p>Determines the type of sound data stored in the file <em>filename</em> using <a class="reference internal" href="#sndhdr.whathdr" title="sndhdr.whathdr"><code class="xref py py-func docutils literal notranslate"><span class="pre">whathdr()</span></code></a>. If it succeeds, returns a tuple as described above, otherwise <code class="docutils literal notranslate"><span class="pre">None</span></code> is returned.</p> </dd></dl> <dl class="function"> <dt id="sndhdr.whathdr"> <code class="descclassname">sndhdr.</code><code class="descname">whathdr</code><span class="sig-paren">(</span><em>filename</em><span class="sig-paren">)</span><a class="headerlink" href="#sndhdr.whathdr" title="Permalink to this definition">¶</a></dt> <dd><p>Determines the type of sound data stored in a file based on the file header. The name of the file is given by <em>filename</em>. This function returns a tuple as described above on success, or <code class="docutils literal notranslate"><span class="pre">None</span></code>.</p> </dd></dl> </div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="imghdr.html" title="previous chapter">21.8. <code class="docutils literal notranslate"><span class="pre">imghdr</span></code> — Determine the type of an image</a></p> <h4>Next topic</h4> <p class="topless"><a href="ossaudiodev.html" title="next chapter">21.10. <code class="docutils literal notranslate"><span class="pre">ossaudiodev</span></code> — Access to OSS-compatible audio devices</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../_sources/library/sndhdr.rst.txt" rel="nofollow">Show Source</a></li> </ul> </div> <div id="searchbox" style="display: none" role="search"> <h3>Quick search</h3> <div class="searchformwrapper"> <form class="search" action="../search.html" method="get"> <input type="text" name="q" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <div class="clearer"></div> </div> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="ossaudiodev.html" title="21.10. ossaudiodev — Access to OSS-compatible audio devices" >next</a> |</li> <li class="right" > <a href="imghdr.html" title="21.8. imghdr — Determine the type of an image" >previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.16 documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> »</li> <li class="nav-item nav-item-2"><a href="mm.html" >21. 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