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41 lines
1.8 KiB
TeX
41 lines
1.8 KiB
TeX
\section{\module{sndhdr} ---
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Determine type of sound file}
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\declaremodule{standard}{sndhdr}
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\modulesynopsis{Determine type of a sound file.}
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\sectionauthor{Fred L. Drake, Jr.}{fdrake@acm.org}
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% Based on comments in the module source file.
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The \module{sndhdr} provides utility functions which attempt to
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determine the type of sound data which is in a file. When these
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functions are able to determine what type of sound data is stored in a
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file, they return a tuple \code{(\var{type}, \var{sampling_rate},
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\var{channels}, \var{frames}, \var{bits_per_sample})}. The value for
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\var{type} indicates the data type and will be one of the strings
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\code{'aifc'}, \code{'aiff'}, \code{'au'}, \code{'hcom'},
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\code{'sndr'}, \code{'sndt'}, \code{'voc'}, \code{'wav'},
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\code{'8svx'}, \code{'sb'}, \code{'ub'}, or \code{'ul'}. The
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\var{sampling_rate} will be either the actual value or \code{0} if
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unknown or difficult to decode. Similarly, \var{channels} will be
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either the number of channels or \code{0} if it cannot be determined
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or if the value is difficult to decode. The value for \var{frames}
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will be either the number of frames or \code{-1}. The last item in
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the tuple, \var{bits_per_sample}, will either be the sample size in
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bits or \code{'A'} for A-LAW\index{A-LAW} or \code{'U'} for
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u-LAW\index{u-LAW}.
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\begin{funcdesc}{what}{filename}
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Determines the type of sound data stored in the file \var{filename}
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using \function{whathdr()}. If it succeeds, returns a tuple as
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described above, otherwise \code{None} is returned.
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\end{funcdesc}
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\begin{funcdesc}{whathdr}{filename}
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Determines the type of sound data stored in a file based on the file
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header. The name of the file is given by \var{filename}. This
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function returns a tuple as described above on success, or
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\code{None}.
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\end{funcdesc}
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