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:mod:`sndhdr` --- Determine type of sound file
==============================================
.. module:: sndhdr
:synopsis: Determine type of a sound file.
.. sectionauthor:: Fred L. Drake, Jr. <fdrake@acm.org>
.. Based on comments in the module source file.
**Source code:** :source:`Lib/sndhdr.py`
.. index::
single: A-LAW
single: u-LAW
--------------
The :mod:`sndhdr` 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
:func:`~collections.namedtuple`, containing five attributes: (``filetype``,
``framerate``, ``nchannels``, ``nframes``, ``sampwidth``). The value for *type*
indicates the data type and will be one of the strings ``'aifc'``, ``'aiff'``,
``'au'``, ``'hcom'``, ``'sndr'``, ``'sndt'``, ``'voc'``, ``'wav'``, ``'8svx'``,
``'sb'``, ``'ub'``, or ``'ul'``. The *sampling_rate* will be either the actual
value or ``0`` if unknown or difficult to decode. Similarly, *channels* will be
either the number of channels or ``0`` if it cannot be determined or if the
value is difficult to decode. The value for *frames* will be either the number
of frames or ``-1``. The last item in the tuple, *bits_per_sample*, will either
be the sample size in bits or ``'A'`` for A-LAW or ``'U'`` for u-LAW.
.. function:: what(filename)
Determines the type of sound data stored in the file *filename* using
:func:`whathdr`. If it succeeds, returns a namedtuple as described above, otherwise
``None`` is returned.
.. versionchanged:: 3.5
Result changed from a tuple to a namedtuple.
.. function:: whathdr(filename)
Determines the type of sound data stored in a file based on the file header.
The name of the file is given by *filename*. This function returns a namedtuple as
described above on success, or ``None``.
.. versionchanged:: 3.5
Result changed from a tuple to a namedtuple.