Edit File: sunau.html
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Multimedia Services</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <div class="section" id="module-sunau"> <h1>21.4. <tt class="xref docutils literal"><span class="pre">sunau</span></tt> — Read and write Sun AU files<a class="headerlink" href="#module-sunau" title="Permalink to this headline">¶</a></h1> <p>The <tt class="xref docutils literal"><span class="pre">sunau</span></tt> module provides a convenient interface to the Sun AU sound format. Note that this module is interface-compatible with the modules <a title="Read and write audio files in AIFF or AIFC format." class="reference external" href="aifc.html#module-aifc"><tt class="xref docutils literal"><span class="pre">aifc</span></tt></a> and <a title="Provide an interface to the WAV sound format." class="reference external" href="wave.html#module-wave"><tt class="xref docutils literal"><span class="pre">wave</span></tt></a>.</p> <p>An audio file consists of a header followed by the data. The fields of the header are:</p> <table border="1" class="docutils"> <colgroup> <col width="24%" /> <col width="76%" /> </colgroup> <thead valign="bottom"> <tr><th class="head">Field</th> <th class="head">Contents</th> </tr> </thead> <tbody valign="top"> <tr><td>magic word</td> <td>The four bytes <tt class="docutils literal"><span class="pre">.snd</span></tt>.</td> </tr> <tr><td>header size</td> <td>Size of the header, including info, in bytes.</td> </tr> <tr><td>data size</td> <td>Physical size of the data, in bytes.</td> </tr> <tr><td>encoding</td> <td>Indicates how the audio samples are encoded.</td> </tr> <tr><td>sample rate</td> <td>The sampling rate.</td> </tr> <tr><td># of channels</td> <td>The number of channels in the samples.</td> </tr> <tr><td>info</td> <td>ASCII string giving a description of the audio file (padded with null bytes).</td> </tr> </tbody> </table> <p>Apart from the info field, all header fields are 4 bytes in size. They are all 32-bit unsigned integers encoded in big-endian byte order.</p> <p>The <tt class="xref docutils literal"><span class="pre">sunau</span></tt> module defines the following functions:</p> <dl class="function"> <dt id="sunau.open"> <tt class="descclassname">sunau.</tt><tt class="descname">open</tt><big>(</big><em>file</em>, <em>mode</em><big>)</big><a class="headerlink" href="#sunau.open" title="Permalink to this definition">¶</a></dt> <dd><p>If <em>file</em> is a string, open the file by that name, otherwise treat it as a seekable file-like object. <em>mode</em> can be any of</p> <dl class="docutils"> <dt><tt class="docutils literal"><span class="pre">'r'</span></tt></dt> <dd>Read only mode.</dd> <dt><tt class="docutils literal"><span class="pre">'w'</span></tt></dt> <dd>Write only mode.</dd> </dl> <p>Note that it does not allow read/write files.</p> <p>A <em>mode</em> of <tt class="docutils literal"><span class="pre">'r'</span></tt> returns a <tt class="xref docutils literal"><span class="pre">AU_read</span></tt> object, while a <em>mode</em> of <tt class="docutils literal"><span class="pre">'w'</span></tt> or <tt class="docutils literal"><span class="pre">'wb'</span></tt> returns a <tt class="xref docutils literal"><span class="pre">AU_write</span></tt> object.</p> </dd></dl> <dl class="function"> <dt id="sunau.openfp"> <tt class="descclassname">sunau.</tt><tt class="descname">openfp</tt><big>(</big><em>file</em>, <em>mode</em><big>)</big><a class="headerlink" href="#sunau.openfp" title="Permalink to this definition">¶</a></dt> <dd>A synonym for <a title="sunau.open" class="reference internal" href="#sunau.open"><tt class="xref docutils literal"><span class="pre">open()</span></tt></a>, maintained for backwards compatibility.</dd></dl> <p>The <tt class="xref docutils literal"><span class="pre">sunau</span></tt> module defines the following exception:</p> <dl class="exception"> <dt id="sunau.Error"> <em class="property">exception </em><tt class="descclassname">sunau.</tt><tt class="descname">Error</tt><a class="headerlink" href="#sunau.Error" title="Permalink to this definition">¶</a></dt> <dd>An error raised when something is impossible because of Sun AU specs or implementation deficiency.</dd></dl> <p>The <tt class="xref docutils literal"><span class="pre">sunau</span></tt> module defines the following data items:</p> <dl class="data"> <dt id="sunau.AUDIO_FILE_MAGIC"> <tt class="descclassname">sunau.</tt><tt class="descname">AUDIO_FILE_MAGIC</tt><a class="headerlink" href="#sunau.AUDIO_FILE_MAGIC" title="Permalink to this definition">¶</a></dt> <dd>An integer every valid Sun AU file begins with, stored in big-endian form. This is the string <tt class="docutils literal"><span class="pre">.snd</span></tt> interpreted as an integer.</dd></dl> <dl class="data"> <dt id="sunau.AUDIO_FILE_ENCODING_MULAW_8"> <tt class="descclassname">sunau.</tt><tt class="descname">AUDIO_FILE_ENCODING_MULAW_8</tt><a class="headerlink" href="#sunau.AUDIO_FILE_ENCODING_MULAW_8" title="Permalink to this definition">¶</a></dt> <dt id="sunau.AUDIO_FILE_ENCODING_LINEAR_8"> <tt class="descclassname">sunau.</tt><tt class="descname">AUDIO_FILE_ENCODING_LINEAR_8</tt><a class="headerlink" href="#sunau.AUDIO_FILE_ENCODING_LINEAR_8" title="Permalink to this definition">¶</a></dt> <dt id="sunau.AUDIO_FILE_ENCODING_LINEAR_16"> <tt class="descclassname">sunau.</tt><tt class="descname">AUDIO_FILE_ENCODING_LINEAR_16</tt><a class="headerlink" href="#sunau.AUDIO_FILE_ENCODING_LINEAR_16" title="Permalink to this definition">¶</a></dt> <dt id="sunau.AUDIO_FILE_ENCODING_LINEAR_24"> <tt class="descclassname">sunau.</tt><tt class="descname">AUDIO_FILE_ENCODING_LINEAR_24</tt><a class="headerlink" href="#sunau.AUDIO_FILE_ENCODING_LINEAR_24" title="Permalink to this definition">¶</a></dt> <dt id="sunau.AUDIO_FILE_ENCODING_LINEAR_32"> <tt class="descclassname">sunau.</tt><tt class="descname">AUDIO_FILE_ENCODING_LINEAR_32</tt><a class="headerlink" href="#sunau.AUDIO_FILE_ENCODING_LINEAR_32" title="Permalink to this definition">¶</a></dt> <dt id="sunau.AUDIO_FILE_ENCODING_ALAW_8"> <tt class="descclassname">sunau.</tt><tt class="descname">AUDIO_FILE_ENCODING_ALAW_8</tt><a class="headerlink" href="#sunau.AUDIO_FILE_ENCODING_ALAW_8" title="Permalink to this definition">¶</a></dt> <dd>Values of the encoding field from the AU header which are supported by this module.</dd></dl> <dl class="data"> <dt id="sunau.AUDIO_FILE_ENCODING_FLOAT"> <tt class="descclassname">sunau.</tt><tt class="descname">AUDIO_FILE_ENCODING_FLOAT</tt><a class="headerlink" href="#sunau.AUDIO_FILE_ENCODING_FLOAT" title="Permalink to this definition">¶</a></dt> <dt id="sunau.AUDIO_FILE_ENCODING_DOUBLE"> <tt class="descclassname">sunau.</tt><tt class="descname">AUDIO_FILE_ENCODING_DOUBLE</tt><a class="headerlink" href="#sunau.AUDIO_FILE_ENCODING_DOUBLE" title="Permalink to this definition">¶</a></dt> <dt id="sunau.AUDIO_FILE_ENCODING_ADPCM_G721"> <tt class="descclassname">sunau.</tt><tt class="descname">AUDIO_FILE_ENCODING_ADPCM_G721</tt><a class="headerlink" href="#sunau.AUDIO_FILE_ENCODING_ADPCM_G721" title="Permalink to this definition">¶</a></dt> <dt id="sunau.AUDIO_FILE_ENCODING_ADPCM_G722"> <tt class="descclassname">sunau.</tt><tt class="descname">AUDIO_FILE_ENCODING_ADPCM_G722</tt><a class="headerlink" href="#sunau.AUDIO_FILE_ENCODING_ADPCM_G722" title="Permalink to this definition">¶</a></dt> <dt id="sunau.AUDIO_FILE_ENCODING_ADPCM_G723_3"> <tt class="descclassname">sunau.</tt><tt class="descname">AUDIO_FILE_ENCODING_ADPCM_G723_3</tt><a class="headerlink" href="#sunau.AUDIO_FILE_ENCODING_ADPCM_G723_3" title="Permalink to this definition">¶</a></dt> <dt id="sunau.AUDIO_FILE_ENCODING_ADPCM_G723_5"> <tt class="descclassname">sunau.</tt><tt class="descname">AUDIO_FILE_ENCODING_ADPCM_G723_5</tt><a class="headerlink" href="#sunau.AUDIO_FILE_ENCODING_ADPCM_G723_5" title="Permalink to this definition">¶</a></dt> <dd>Additional known values of the encoding field from the AU header, but which are not supported by this module.</dd></dl> <div class="section" id="au-read-objects"> <span id="id1"></span><h2>21.4.1. AU_read Objects<a class="headerlink" href="#au-read-objects" title="Permalink to this headline">¶</a></h2> <p>AU_read objects, as returned by <a title="sunau.open" class="reference internal" href="#sunau.open"><tt class="xref docutils literal"><span class="pre">open()</span></tt></a> above, have the following methods:</p> <dl class="method"> <dt id="sunau.AU_read.close"> <tt class="descclassname">AU_read.</tt><tt class="descname">close</tt><big>(</big><big>)</big><a class="headerlink" href="#sunau.AU_read.close" title="Permalink to this definition">¶</a></dt> <dd>Close the stream, and make the instance unusable. (This is called automatically on deletion.)</dd></dl> <dl class="method"> <dt id="sunau.AU_read.getnchannels"> <tt class="descclassname">AU_read.</tt><tt class="descname">getnchannels</tt><big>(</big><big>)</big><a class="headerlink" href="#sunau.AU_read.getnchannels" title="Permalink to this definition">¶</a></dt> <dd>Returns number of audio channels (1 for mone, 2 for stereo).</dd></dl> <dl class="method"> <dt id="sunau.AU_read.getsampwidth"> <tt class="descclassname">AU_read.</tt><tt class="descname">getsampwidth</tt><big>(</big><big>)</big><a class="headerlink" href="#sunau.AU_read.getsampwidth" title="Permalink to this definition">¶</a></dt> <dd>Returns sample width in bytes.</dd></dl> <dl class="method"> <dt id="sunau.AU_read.getframerate"> <tt class="descclassname">AU_read.</tt><tt class="descname">getframerate</tt><big>(</big><big>)</big><a class="headerlink" href="#sunau.AU_read.getframerate" title="Permalink to this definition">¶</a></dt> <dd>Returns sampling frequency.</dd></dl> <dl class="method"> <dt id="sunau.AU_read.getnframes"> <tt class="descclassname">AU_read.</tt><tt class="descname">getnframes</tt><big>(</big><big>)</big><a class="headerlink" href="#sunau.AU_read.getnframes" title="Permalink to this definition">¶</a></dt> <dd>Returns number of audio frames.</dd></dl> <dl class="method"> <dt id="sunau.AU_read.getcomptype"> <tt class="descclassname">AU_read.</tt><tt class="descname">getcomptype</tt><big>(</big><big>)</big><a class="headerlink" href="#sunau.AU_read.getcomptype" title="Permalink to this definition">¶</a></dt> <dd>Returns compression type. Supported compression types are <tt class="docutils literal"><span class="pre">'ULAW'</span></tt>, <tt class="docutils literal"><span class="pre">'ALAW'</span></tt> and <tt class="docutils literal"><span class="pre">'NONE'</span></tt>.</dd></dl> <dl class="method"> <dt id="sunau.AU_read.getcompname"> <tt class="descclassname">AU_read.</tt><tt class="descname">getcompname</tt><big>(</big><big>)</big><a class="headerlink" href="#sunau.AU_read.getcompname" title="Permalink to this definition">¶</a></dt> <dd>Human-readable version of <a title="sunau.AU_read.getcomptype" class="reference internal" href="#sunau.AU_read.getcomptype"><tt class="xref docutils literal"><span class="pre">getcomptype()</span></tt></a>. The supported types have the respective names <tt class="docutils literal"><span class="pre">'CCITT</span> <span class="pre">G.711</span> <span class="pre">u-law'</span></tt>, <tt class="docutils literal"><span class="pre">'CCITT</span> <span class="pre">G.711</span> <span class="pre">A-law'</span></tt> and <tt class="docutils literal"><span class="pre">'not</span> <span class="pre">compressed'</span></tt>.</dd></dl> <dl class="method"> <dt id="sunau.AU_read.getparams"> <tt class="descclassname">AU_read.</tt><tt class="descname">getparams</tt><big>(</big><big>)</big><a class="headerlink" href="#sunau.AU_read.getparams" title="Permalink to this definition">¶</a></dt> <dd>Returns a tuple <tt class="docutils literal"><span class="pre">(nchannels,</span> <span class="pre">sampwidth,</span> <span class="pre">framerate,</span> <span class="pre">nframes,</span> <span class="pre">comptype,</span> <span class="pre">compname)</span></tt>, equivalent to output of the <tt class="xref docutils literal"><span class="pre">get*()</span></tt> methods.</dd></dl> <dl class="method"> <dt id="sunau.AU_read.readframes"> <tt class="descclassname">AU_read.</tt><tt class="descname">readframes</tt><big>(</big><em>n</em><big>)</big><a class="headerlink" href="#sunau.AU_read.readframes" title="Permalink to this definition">¶</a></dt> <dd>Reads and returns at most <em>n</em> frames of audio, as a string of bytes. The data will be returned in linear format. If the original data is in u-LAW format, it will be converted.</dd></dl> <dl class="method"> <dt id="sunau.AU_read.rewind"> <tt class="descclassname">AU_read.</tt><tt class="descname">rewind</tt><big>(</big><big>)</big><a class="headerlink" href="#sunau.AU_read.rewind" title="Permalink to this definition">¶</a></dt> <dd>Rewind the file pointer to the beginning of the audio stream.</dd></dl> <p>The following two methods define a term “position” which is compatible between them, and is otherwise implementation dependent.</p> <dl class="method"> <dt id="sunau.AU_read.setpos"> <tt class="descclassname">AU_read.</tt><tt class="descname">setpos</tt><big>(</big><em>pos</em><big>)</big><a class="headerlink" href="#sunau.AU_read.setpos" title="Permalink to this definition">¶</a></dt> <dd>Set the file pointer to the specified position. Only values returned from <a title="sunau.AU_read.tell" class="reference internal" href="#sunau.AU_read.tell"><tt class="xref docutils literal"><span class="pre">tell()</span></tt></a> should be used for <em>pos</em>.</dd></dl> <dl class="method"> <dt id="sunau.AU_read.tell"> <tt class="descclassname">AU_read.</tt><tt class="descname">tell</tt><big>(</big><big>)</big><a class="headerlink" href="#sunau.AU_read.tell" title="Permalink to this definition">¶</a></dt> <dd>Return current file pointer position. Note that the returned value has nothing to do with the actual position in the file.</dd></dl> <p>The following two functions are defined for compatibility with the <a title="Read and write audio files in AIFF or AIFC format." class="reference external" href="aifc.html#module-aifc"><tt class="xref docutils literal"><span class="pre">aifc</span></tt></a>, and don’t do anything interesting.</p> <dl class="method"> <dt id="sunau.AU_read.getmarkers"> <tt class="descclassname">AU_read.</tt><tt class="descname">getmarkers</tt><big>(</big><big>)</big><a class="headerlink" href="#sunau.AU_read.getmarkers" title="Permalink to this definition">¶</a></dt> <dd>Returns <tt class="xref docutils literal"><span class="pre">None</span></tt>.</dd></dl> <dl class="method"> <dt id="sunau.AU_read.getmark"> <tt class="descclassname">AU_read.</tt><tt class="descname">getmark</tt><big>(</big><em>id</em><big>)</big><a class="headerlink" href="#sunau.AU_read.getmark" title="Permalink to this definition">¶</a></dt> <dd>Raise an error.</dd></dl> </div> <div class="section" id="au-write-objects"> <span id="id2"></span><h2>21.4.2. AU_write Objects<a class="headerlink" href="#au-write-objects" title="Permalink to this headline">¶</a></h2> <p>AU_write objects, as returned by <a title="sunau.open" class="reference internal" href="#sunau.open"><tt class="xref docutils literal"><span class="pre">open()</span></tt></a> above, have the following methods:</p> <dl class="method"> <dt id="sunau.AU_write.setnchannels"> <tt class="descclassname">AU_write.</tt><tt class="descname">setnchannels</tt><big>(</big><em>n</em><big>)</big><a class="headerlink" href="#sunau.AU_write.setnchannels" title="Permalink to this definition">¶</a></dt> <dd>Set the number of channels.</dd></dl> <dl class="method"> <dt id="sunau.AU_write.setsampwidth"> <tt class="descclassname">AU_write.</tt><tt class="descname">setsampwidth</tt><big>(</big><em>n</em><big>)</big><a class="headerlink" href="#sunau.AU_write.setsampwidth" title="Permalink to this definition">¶</a></dt> <dd>Set the sample width (in bytes.)</dd></dl> <dl class="method"> <dt id="sunau.AU_write.setframerate"> <tt class="descclassname">AU_write.</tt><tt class="descname">setframerate</tt><big>(</big><em>n</em><big>)</big><a class="headerlink" href="#sunau.AU_write.setframerate" title="Permalink to this definition">¶</a></dt> <dd>Set the frame rate.</dd></dl> <dl class="method"> <dt id="sunau.AU_write.setnframes"> <tt class="descclassname">AU_write.</tt><tt class="descname">setnframes</tt><big>(</big><em>n</em><big>)</big><a class="headerlink" href="#sunau.AU_write.setnframes" title="Permalink to this definition">¶</a></dt> <dd>Set the number of frames. This can be later changed, when and if more frames are written.</dd></dl> <dl class="method"> <dt id="sunau.AU_write.setcomptype"> <tt class="descclassname">AU_write.</tt><tt class="descname">setcomptype</tt><big>(</big><em>type</em>, <em>name</em><big>)</big><a class="headerlink" href="#sunau.AU_write.setcomptype" title="Permalink to this definition">¶</a></dt> <dd>Set the compression type and description. Only <tt class="docutils literal"><span class="pre">'NONE'</span></tt> and <tt class="docutils literal"><span class="pre">'ULAW'</span></tt> are supported on output.</dd></dl> <dl class="method"> <dt id="sunau.AU_write.setparams"> <tt class="descclassname">AU_write.</tt><tt class="descname">setparams</tt><big>(</big><em>tuple</em><big>)</big><a class="headerlink" href="#sunau.AU_write.setparams" title="Permalink to this definition">¶</a></dt> <dd>The <em>tuple</em> should be <tt class="docutils literal"><span class="pre">(nchannels,</span> <span class="pre">sampwidth,</span> <span class="pre">framerate,</span> <span class="pre">nframes,</span> <span class="pre">comptype,</span> <span class="pre">compname)</span></tt>, with values valid for the <tt class="xref docutils literal"><span class="pre">set*()</span></tt> methods. Set all parameters.</dd></dl> <dl class="method"> <dt id="sunau.AU_write.tell"> <tt class="descclassname">AU_write.</tt><tt class="descname">tell</tt><big>(</big><big>)</big><a class="headerlink" href="#sunau.AU_write.tell" title="Permalink to this definition">¶</a></dt> <dd>Return current position in the file, with the same disclaimer for the <a title="sunau.AU_read.tell" class="reference internal" href="#sunau.AU_read.tell"><tt class="xref docutils literal"><span class="pre">AU_read.tell()</span></tt></a> and <a title="sunau.AU_read.setpos" class="reference internal" href="#sunau.AU_read.setpos"><tt class="xref docutils literal"><span class="pre">AU_read.setpos()</span></tt></a> methods.</dd></dl> <dl class="method"> <dt id="sunau.AU_write.writeframesraw"> <tt class="descclassname">AU_write.</tt><tt class="descname">writeframesraw</tt><big>(</big><em>data</em><big>)</big><a class="headerlink" href="#sunau.AU_write.writeframesraw" title="Permalink to this definition">¶</a></dt> <dd>Write audio frames, without correcting <em>nframes</em>.</dd></dl> <dl class="method"> <dt id="sunau.AU_write.writeframes"> <tt class="descclassname">AU_write.</tt><tt class="descname">writeframes</tt><big>(</big><em>data</em><big>)</big><a class="headerlink" href="#sunau.AU_write.writeframes" title="Permalink to this definition">¶</a></dt> <dd>Write audio frames and make sure <em>nframes</em> is correct.</dd></dl> <dl class="method"> <dt id="sunau.AU_write.close"> <tt class="descclassname">AU_write.</tt><tt class="descname">close</tt><big>(</big><big>)</big><a class="headerlink" href="#sunau.AU_write.close" title="Permalink to this definition">¶</a></dt> <dd><p>Make sure <em>nframes</em> is correct, and close the file.</p> <p>This method is called upon deletion.</p> </dd></dl> <p>Note that it is invalid to set any parameters after calling <tt class="xref docutils literal"><span class="pre">writeframes()</span></tt> or <tt class="xref docutils literal"><span class="pre">writeframesraw()</span></tt>.</p> </div> </div> </div> </div> </div> <div class="sphinxsidebar"> <div class="sphinxsidebarwrapper"> <h3><a href="../contents.html">Table Of Contents</a></h3> <ul> <li><a class="reference external" href="#">21.4. <tt class="docutils literal"><span class="pre">sunau</span></tt> — Read and write Sun AU files</a><ul> <li><a class="reference external" href="#au-read-objects">21.4.1. AU_read Objects</a></li> <li><a class="reference external" href="#au-write-objects">21.4.2. AU_write Objects</a></li> </ul> </li> </ul> <h4>Previous topic</h4> <p class="topless"><a href="aifc.html" title="previous chapter">21.3. <tt class="docutils literal docutils literal docutils literal"><span class="pre">aifc</span></tt> — Read and write AIFF and AIFC files</a></p> <h4>Next topic</h4> <p class="topless"><a href="wave.html" title="next chapter">21.5. <tt class="docutils literal docutils literal"><span class="pre">wave</span></tt> — Read and write WAV files</a></p> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../bugs.html">Report a Bug</a></li> <li><a href="../_sources/library/sunau.txt" rel="nofollow">Show Source</a></li> </ul> <div id="searchbox" style="display: none"> <h3>Quick search</h3> <form class="search" action="../search.html" method="get"> <input type="text" name="q" size="18" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> <p class="searchtip" style="font-size: 90%"> Enter search terms or a module, class or function name. </p> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <div class="clearer"></div> </div> <div class="related"> <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="../modindex.html" title="Global Module Index" >modules</a> |</li> <li class="right" > <a href="wave.html" title="21.5. wave — Read and write WAV files" >next</a> |</li> <li class="right" > <a href="aifc.html" title="21.3. aifc — Read and write AIFF and AIFC files" >previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="../index.html">Python v2.6.6 documentation</a> »</li> <li><a href="index.html" >The Python Standard Library</a> »</li> <li><a href="mm.html" >21. 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