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  <div class="section" id="module-aifc">
<span id="aifc-read-and-write-aiff-and-aifc-files"></span><h1>21.3. <a class="reference internal" href="#module-aifc" title="aifc: Read and write audio files in AIFF or AIFC format."><code class="xref py py-mod docutils literal notranslate"><span class="pre">aifc</span></code></a> — Read and write AIFF and AIFC files<a class="headerlink" href="#module-aifc" 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/aifc.py">Lib/aifc.py</a></p>
<hr class="docutils" />
<p>This module provides support for reading and writing AIFF and AIFF-C files.
AIFF is Audio Interchange File Format, a format for storing digital audio
samples in a file.  AIFF-C is a newer version of the format that includes the
ability to compress the audio data.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Some operations may only work under IRIX; these will raise <a class="reference internal" href="exceptions.html#exceptions.ImportError" title="exceptions.ImportError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">ImportError</span></code></a>
when attempting to import the <code class="xref py py-mod docutils literal notranslate"><span class="pre">cl</span></code> module, which is only available on
IRIX.</p>
</div>
<p>Audio files have a number of parameters that describe the audio data. The
sampling rate or frame rate is the number of times per second the sound is
sampled.  The number of channels indicate if the audio is mono, stereo, or
quadro.  Each frame consists of one sample per channel.  The sample size is the
size in bytes of each sample.  Thus a frame consists of
<em>nchannels</em>*<em>samplesize</em> bytes, and a second’s worth of audio consists of
<em>nchannels</em>*<em>samplesize</em>*<em>framerate</em> bytes.</p>
<p>For example, CD quality audio has a sample size of two bytes (16 bits), uses two
channels (stereo) and has a frame rate of 44,100 frames/second.  This gives a
frame size of 4 bytes (2*2), and a second’s worth occupies 2*2*44100 bytes
(176,400 bytes).</p>
<p>Module <a class="reference internal" href="#module-aifc" title="aifc: Read and write audio files in AIFF or AIFC format."><code class="xref py py-mod docutils literal notranslate"><span class="pre">aifc</span></code></a> defines the following function:</p>
<dl class="function">
<dt id="aifc.open">
<code class="descclassname">aifc.</code><code class="descname">open</code><span class="sig-paren">(</span><em>file</em><span class="optional">[</span>, <em>mode</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.open" title="Permalink to this definition">¶</a></dt>
<dd><p>Open an AIFF or AIFF-C file and return an object instance with methods that are
described below.  The argument <em>file</em> is either a string naming a file or a file
object.  <em>mode</em> must be <code class="docutils literal notranslate"><span class="pre">'r'</span></code> or <code class="docutils literal notranslate"><span class="pre">'rb'</span></code> when the file must be opened for
reading, or <code class="docutils literal notranslate"><span class="pre">'w'</span></code>  or <code class="docutils literal notranslate"><span class="pre">'wb'</span></code> when the file must be opened for writing.  If
omitted, <code class="docutils literal notranslate"><span class="pre">file.mode</span></code> is used if it exists, otherwise <code class="docutils literal notranslate"><span class="pre">'rb'</span></code> is used.  When
used for writing, the file object should be seekable, unless you know ahead of
time how many samples you are going to write in total and use
<code class="xref py py-meth docutils literal notranslate"><span class="pre">writeframesraw()</span></code> and <code class="xref py py-meth docutils literal notranslate"><span class="pre">setnframes()</span></code>.</p>
</dd></dl>

<p>Objects returned by <a class="reference internal" href="#aifc.open" title="aifc.open"><code class="xref py py-func docutils literal notranslate"><span class="pre">open()</span></code></a> when a file is opened for reading have the
following methods:</p>
<dl class="method">
<dt id="aifc.aifc.getnchannels">
<code class="descclassname">aifc.</code><code class="descname">getnchannels</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.getnchannels" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the number of audio channels (1 for mono, 2 for stereo).</p>
</dd></dl>

<dl class="method">
<dt id="aifc.aifc.getsampwidth">
<code class="descclassname">aifc.</code><code class="descname">getsampwidth</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.getsampwidth" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the size in bytes of individual samples.</p>
</dd></dl>

<dl class="method">
<dt id="aifc.aifc.getframerate">
<code class="descclassname">aifc.</code><code class="descname">getframerate</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.getframerate" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the sampling rate (number of audio frames per second).</p>
</dd></dl>

<dl class="method">
<dt id="aifc.aifc.getnframes">
<code class="descclassname">aifc.</code><code class="descname">getnframes</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.getnframes" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the number of audio frames in the file.</p>
</dd></dl>

<dl class="method">
<dt id="aifc.aifc.getcomptype">
<code class="descclassname">aifc.</code><code class="descname">getcomptype</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.getcomptype" title="Permalink to this definition">¶</a></dt>
<dd><p>Return a four-character string describing the type of compression used in the
audio file.  For AIFF files, the returned value is <code class="docutils literal notranslate"><span class="pre">'NONE'</span></code>.</p>
</dd></dl>

<dl class="method">
<dt id="aifc.aifc.getcompname">
<code class="descclassname">aifc.</code><code class="descname">getcompname</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.getcompname" title="Permalink to this definition">¶</a></dt>
<dd><p>Return a human-readable description of the type of compression used in the audio
file.  For AIFF files, the returned value is <code class="docutils literal notranslate"><span class="pre">'not</span> <span class="pre">compressed'</span></code>.</p>
</dd></dl>

<dl class="method">
<dt id="aifc.aifc.getparams">
<code class="descclassname">aifc.</code><code class="descname">getparams</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.getparams" title="Permalink to this definition">¶</a></dt>
<dd><p>Return a tuple consisting of all of the above values in the above order.</p>
</dd></dl>

<dl class="method">
<dt id="aifc.aifc.getmarkers">
<code class="descclassname">aifc.</code><code class="descname">getmarkers</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.getmarkers" title="Permalink to this definition">¶</a></dt>
<dd><p>Return a list of markers in the audio file.  A marker consists of a tuple of
three elements.  The first is the mark ID (an integer), the second is the mark
position in frames from the beginning of the data (an integer), the third is the
name of the mark (a string).</p>
</dd></dl>

<dl class="method">
<dt id="aifc.aifc.getmark">
<code class="descclassname">aifc.</code><code class="descname">getmark</code><span class="sig-paren">(</span><em>id</em><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.getmark" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the tuple as described in <a class="reference internal" href="#aifc.aifc.getmarkers" title="aifc.aifc.getmarkers"><code class="xref py py-meth docutils literal notranslate"><span class="pre">getmarkers()</span></code></a> for the mark with the given
<em>id</em>.</p>
</dd></dl>

<dl class="method">
<dt id="aifc.aifc.readframes">
<code class="descclassname">aifc.</code><code class="descname">readframes</code><span class="sig-paren">(</span><em>nframes</em><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.readframes" title="Permalink to this definition">¶</a></dt>
<dd><p>Read and return the next <em>nframes</em> frames from the audio file.  The returned
data is a string containing for each frame the uncompressed samples of all
channels.</p>
</dd></dl>

<dl class="method">
<dt id="aifc.aifc.rewind">
<code class="descclassname">aifc.</code><code class="descname">rewind</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.rewind" title="Permalink to this definition">¶</a></dt>
<dd><p>Rewind the read pointer.  The next <a class="reference internal" href="#aifc.aifc.readframes" title="aifc.aifc.readframes"><code class="xref py py-meth docutils literal notranslate"><span class="pre">readframes()</span></code></a> will start from the
beginning.</p>
</dd></dl>

<dl class="method">
<dt id="aifc.aifc.setpos">
<code class="descclassname">aifc.</code><code class="descname">setpos</code><span class="sig-paren">(</span><em>pos</em><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.setpos" title="Permalink to this definition">¶</a></dt>
<dd><p>Seek to the specified frame number.</p>
</dd></dl>

<dl class="method">
<dt id="aifc.aifc.tell">
<code class="descclassname">aifc.</code><code class="descname">tell</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.tell" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the current frame number.</p>
</dd></dl>

<dl class="method">
<dt id="aifc.aifc.close">
<code class="descclassname">aifc.</code><code class="descname">close</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.close" title="Permalink to this definition">¶</a></dt>
<dd><p>Close the AIFF file.  After calling this method, the object can no longer be
used.</p>
</dd></dl>

<p>Objects returned by <a class="reference internal" href="#aifc.open" title="aifc.open"><code class="xref py py-func docutils literal notranslate"><span class="pre">open()</span></code></a> when a file is opened for writing have all the
above methods, except for <code class="xref py py-meth docutils literal notranslate"><span class="pre">readframes()</span></code> and <code class="xref py py-meth docutils literal notranslate"><span class="pre">setpos()</span></code>.  In addition
the following methods exist.  The <code class="xref py py-meth docutils literal notranslate"><span class="pre">get*()</span></code> methods can only be called after
the corresponding <code class="xref py py-meth docutils literal notranslate"><span class="pre">set*()</span></code> methods have been called.  Before the first
<code class="xref py py-meth docutils literal notranslate"><span class="pre">writeframes()</span></code> or <code class="xref py py-meth docutils literal notranslate"><span class="pre">writeframesraw()</span></code>, all parameters except for the
number of frames must be filled in.</p>
<dl class="method">
<dt id="aifc.aifc.aiff">
<code class="descclassname">aifc.</code><code class="descname">aiff</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.aiff" title="Permalink to this definition">¶</a></dt>
<dd><p>Create an AIFF file.  The default is that an AIFF-C file is created, unless the
name of the file ends in <code class="docutils literal notranslate"><span class="pre">'.aiff'</span></code> in which case the default is an AIFF file.</p>
</dd></dl>

<dl class="method">
<dt id="aifc.aifc.aifc">
<code class="descclassname">aifc.</code><code class="descname">aifc</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.aifc" title="Permalink to this definition">¶</a></dt>
<dd><p>Create an AIFF-C file.  The default is that an AIFF-C file is created, unless
the name of the file ends in <code class="docutils literal notranslate"><span class="pre">'.aiff'</span></code> in which case the default is an AIFF
file.</p>
</dd></dl>

<dl class="method">
<dt id="aifc.aifc.setnchannels">
<code class="descclassname">aifc.</code><code class="descname">setnchannels</code><span class="sig-paren">(</span><em>nchannels</em><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.setnchannels" title="Permalink to this definition">¶</a></dt>
<dd><p>Specify the number of channels in the audio file.</p>
</dd></dl>

<dl class="method">
<dt id="aifc.aifc.setsampwidth">
<code class="descclassname">aifc.</code><code class="descname">setsampwidth</code><span class="sig-paren">(</span><em>width</em><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.setsampwidth" title="Permalink to this definition">¶</a></dt>
<dd><p>Specify the size in bytes of audio samples.</p>
</dd></dl>

<dl class="method">
<dt id="aifc.aifc.setframerate">
<code class="descclassname">aifc.</code><code class="descname">setframerate</code><span class="sig-paren">(</span><em>rate</em><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.setframerate" title="Permalink to this definition">¶</a></dt>
<dd><p>Specify the sampling frequency in frames per second.</p>
</dd></dl>

<dl class="method">
<dt id="aifc.aifc.setnframes">
<code class="descclassname">aifc.</code><code class="descname">setnframes</code><span class="sig-paren">(</span><em>nframes</em><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.setnframes" title="Permalink to this definition">¶</a></dt>
<dd><p>Specify the number of frames that are to be written to the audio file. If this
parameter is not set, or not set correctly, the file needs to support seeking.</p>
</dd></dl>

<dl class="method">
<dt id="aifc.aifc.setcomptype">
<code class="descclassname">aifc.</code><code class="descname">setcomptype</code><span class="sig-paren">(</span><em>type</em>, <em>name</em><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.setcomptype" title="Permalink to this definition">¶</a></dt>
<dd><p id="index-1">Specify the compression type.  If not specified, the audio data will not be
compressed.  In AIFF files, compression is not possible.  The name parameter
should be a human-readable description of the compression type, the type
parameter should be a four-character string.  Currently the following
compression types are supported: NONE, ULAW, ALAW, G722.</p>
</dd></dl>

<dl class="method">
<dt id="aifc.aifc.setparams">
<code class="descclassname">aifc.</code><code class="descname">setparams</code><span class="sig-paren">(</span><em>nchannels</em>, <em>sampwidth</em>, <em>framerate</em>, <em>comptype</em>, <em>compname</em><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.setparams" title="Permalink to this definition">¶</a></dt>
<dd><p>Set all the above parameters at once.  The argument is a tuple consisting of the
various parameters.  This means that it is possible to use the result of a
<a class="reference internal" href="#aifc.aifc.getparams" title="aifc.aifc.getparams"><code class="xref py py-meth docutils literal notranslate"><span class="pre">getparams()</span></code></a> call as argument to <a class="reference internal" href="#aifc.aifc.setparams" title="aifc.aifc.setparams"><code class="xref py py-meth docutils literal notranslate"><span class="pre">setparams()</span></code></a>.</p>
</dd></dl>

<dl class="method">
<dt id="aifc.aifc.setmark">
<code class="descclassname">aifc.</code><code class="descname">setmark</code><span class="sig-paren">(</span><em>id</em>, <em>pos</em>, <em>name</em><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.setmark" title="Permalink to this definition">¶</a></dt>
<dd><p>Add a mark with the given id (larger than 0), and the given name at the given
position.  This method can be called at any time before <a class="reference internal" href="#aifc.aifc.close" title="aifc.aifc.close"><code class="xref py py-meth docutils literal notranslate"><span class="pre">close()</span></code></a>.</p>
</dd></dl>

<dl class="method">
<dt>
<code class="descclassname">aifc.</code><code class="descname">tell</code><span class="sig-paren">(</span><span class="sig-paren">)</span></dt>
<dd><p>Return the current write position in the output file.  Useful in combination
with <a class="reference internal" href="#aifc.aifc.setmark" title="aifc.aifc.setmark"><code class="xref py py-meth docutils literal notranslate"><span class="pre">setmark()</span></code></a>.</p>
</dd></dl>

<dl class="method">
<dt id="aifc.aifc.writeframes">
<code class="descclassname">aifc.</code><code class="descname">writeframes</code><span class="sig-paren">(</span><em>data</em><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.writeframes" title="Permalink to this definition">¶</a></dt>
<dd><p>Write data to the output file.  This method can only be called after the audio
file parameters have been set.</p>
</dd></dl>

<dl class="method">
<dt id="aifc.aifc.writeframesraw">
<code class="descclassname">aifc.</code><code class="descname">writeframesraw</code><span class="sig-paren">(</span><em>data</em><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.writeframesraw" title="Permalink to this definition">¶</a></dt>
<dd><p>Like <a class="reference internal" href="#aifc.aifc.writeframes" title="aifc.aifc.writeframes"><code class="xref py py-meth docutils literal notranslate"><span class="pre">writeframes()</span></code></a>, except that the header of the audio file is not
updated.</p>
</dd></dl>

<dl class="method">
<dt>
<code class="descclassname">aifc.</code><code class="descname">close</code><span class="sig-paren">(</span><span class="sig-paren">)</span></dt>
<dd><p>Close the AIFF file.  The header of the file is updated to reflect the actual
size of the audio data. After calling this method, the object can no longer be
used.</p>
</dd></dl>

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