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<title>14.10 sndhdr -- Determine type of sound file
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<H1><A NAME=
"SECTION00161000000000000000000">
14.10 <tt class=
"module">sndhdr
</tt> --
Determine type of sound file
</A>
<A NAME=
"module-sndhdr"></A>
The
<tt class=
"module">sndhdr
</tt> 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>(
<var>type
</var>,
<var>sampling_rate
</var>,
<var>channels
</var>,
<var>frames
</var>,
<var>bits_per_sample
</var>)
</code>. The value for
<var>type
</var> indicates the data type and will be one of the strings
<code>'aifc'
</code>,
<code>'aiff'
</code>,
<code>'au'
</code>,
<code>'hcom'
</code>,
<code>'sndr'
</code>,
<code>'sndt'
</code>,
<code>'voc'
</code>,
<code>'wav'
</code>,
<code>'
8svx'
</code>,
<code>'sb'
</code>,
<code>'ub'
</code>, or
<code>'ul'
</code>. The
<var>sampling_rate
</var> will be either the actual value or
<code>0</code> if
unknown or difficult to decode. Similarly,
<var>channels
</var> will be
either the number of channels or
<code>0</code> if it cannot be determined
or if the value is difficult to decode. The value for
<var>frames
</var>
will be either the number of frames or
<code>-
1</code>. The last item in
the tuple,
<var>bits_per_sample
</var>, will either be the sample size in
bits or
<code>'A'
</code> for A-LAW
<a id='l2h-
4767' xml:id='l2h-
4767'
></a> or
<code>'U'
</code> for
u-LAW
<a id='l2h-
4768' xml:id='l2h-
4768'
></a>.
<dl><dt><table cellpadding=
"0" cellspacing=
"0"><tr valign=
"baseline">
<td><nobr><b><tt id='l2h-
4765' xml:id='l2h-
4765'
class=
"function">what
</tt></b>(
</nobr></td>
<td><var>filename
</var>)
</td></tr></table></dt>
Determines the type of sound data stored in the file
<var>filename
</var>
using
<tt class=
"function">whathdr()
</tt>. If it succeeds, returns a tuple as
described above, otherwise
<code>None
</code> is returned.
<dl><dt><table cellpadding=
"0" cellspacing=
"0"><tr valign=
"baseline">
<td><nobr><b><tt id='l2h-
4766' xml:id='l2h-
4766'
class=
"function">whathdr
</tt></b>(
</nobr></td>
<td><var>filename
</var>)
</td></tr></table></dt>
Determines the type of sound data stored in a file based on the file
header. The name of the file is given by
<var>filename
</var>. This
function returns a tuple as described above on success, or
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<span class=
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2005.
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