The 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 tuple (type, sampling_rate,
channels, frames, bits_per_sample).  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.
| filename) | 
None is returned.
| filename) | 
None.