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-\section{\module{sunau} ---
-         Read and write Sun AU files}
-
-\declaremodule{standard}{sunau}
-\sectionauthor{Moshe Zadka}{moshez@zadka.site.co.il}
-\modulesynopsis{Provide an interface to the Sun AU sound format.}
-
-The \module{sunau} module provides a convenient interface to the Sun
-AU sound format.  Note that this module is interface-compatible with
-the modules \refmodule{aifc} and \refmodule{wave}.
-
-An audio file consists of a header followed by the data.  The fields
-of the header are:
-
-\begin{tableii}{l|l}{textrm}{Field}{Contents}
-  \lineii{magic word}{The four bytes \samp{.snd}.}
-  \lineii{header size}{Size of the header, including info, in bytes.}
-  \lineii{data size}{Physical size of the data, in bytes.}
-  \lineii{encoding}{Indicates how the audio samples are encoded.}
-  \lineii{sample rate}{The sampling rate.}
-  \lineii{\# of channels}{The number of channels in the samples.}
-  \lineii{info}{\ASCII{} string giving a description of the audio
-                file (padded with null bytes).}
-\end{tableii}
-
-Apart from the info field, all header fields are 4 bytes in size.
-They are all 32-bit unsigned integers encoded in big-endian byte
-order.
-
-
-The \module{sunau} module defines the following functions:
-
-\begin{funcdesc}{open}{file, mode}
-If \var{file} is a string, open the file by that name, otherwise treat it
-as a seekable file-like object. \var{mode} can be any of
-\begin{description}
-	\item[\code{'r'}] Read only mode.
-	\item[\code{'w'}] Write only mode.
-\end{description}
-Note that it does not allow read/write files.
-
-A \var{mode} of \code{'r'} returns a \class{AU_read}
-object, while a \var{mode} of \code{'w'} or \code{'wb'} returns
-a \class{AU_write} object.
-\end{funcdesc}
-
-\begin{funcdesc}{openfp}{file, mode}
-A synonym for \function{open}, maintained for backwards compatibility.
-\end{funcdesc}
-
-The \module{sunau} module defines the following exception:
-
-\begin{excdesc}{Error}
-An error raised when something is impossible because of Sun AU specs or 
-implementation deficiency.
-\end{excdesc}
-
-The \module{sunau} module defines the following data items:
-
-\begin{datadesc}{AUDIO_FILE_MAGIC}
-An integer every valid Sun AU file begins with, stored in big-endian
-form.  This is the string \samp{.snd} interpreted as an integer.
-\end{datadesc}
-
-\begin{datadesc}{AUDIO_FILE_ENCODING_MULAW_8}
-\dataline{AUDIO_FILE_ENCODING_LINEAR_8}
-\dataline{AUDIO_FILE_ENCODING_LINEAR_16}
-\dataline{AUDIO_FILE_ENCODING_LINEAR_24}
-\dataline{AUDIO_FILE_ENCODING_LINEAR_32}
-\dataline{AUDIO_FILE_ENCODING_ALAW_8}
-Values of the encoding field from the AU header which are supported by
-this module.
-\end{datadesc}
-
-\begin{datadesc}{AUDIO_FILE_ENCODING_FLOAT}
-\dataline{AUDIO_FILE_ENCODING_DOUBLE}
-\dataline{AUDIO_FILE_ENCODING_ADPCM_G721}
-\dataline{AUDIO_FILE_ENCODING_ADPCM_G722}
-\dataline{AUDIO_FILE_ENCODING_ADPCM_G723_3}
-\dataline{AUDIO_FILE_ENCODING_ADPCM_G723_5}
-Additional known values of the encoding field from the AU header, but
-which are not supported by this module.
-\end{datadesc}
-
-
-\subsection{AU_read Objects \label{au-read-objects}}
-
-AU_read objects, as returned by \function{open()} above, have the
-following methods:
-
-\begin{methoddesc}[AU_read]{close}{}
-Close the stream, and make the instance unusable. (This is 
-called automatically on deletion.)
-\end{methoddesc}
-
-\begin{methoddesc}[AU_read]{getnchannels}{}
-Returns number of audio channels (1 for mone, 2 for stereo).
-\end{methoddesc}
-
-\begin{methoddesc}[AU_read]{getsampwidth}{}
-Returns sample width in bytes.
-\end{methoddesc}
-
-\begin{methoddesc}[AU_read]{getframerate}{}
-Returns sampling frequency.
-\end{methoddesc}
-
-\begin{methoddesc}[AU_read]{getnframes}{}
-Returns number of audio frames.
-\end{methoddesc}
-
-\begin{methoddesc}[AU_read]{getcomptype}{}
-Returns compression type.
-Supported compression types are \code{'ULAW'}, \code{'ALAW'} and \code{'NONE'}.
-\end{methoddesc}
-
-\begin{methoddesc}[AU_read]{getcompname}{}
-Human-readable version of \method{getcomptype()}. 
-The supported types have the respective names \code{'CCITT G.711
-u-law'}, \code{'CCITT G.711 A-law'} and \code{'not compressed'}.
-\end{methoddesc}
-
-\begin{methoddesc}[AU_read]{getparams}{}
-Returns a tuple \code{(\var{nchannels}, \var{sampwidth},
-\var{framerate}, \var{nframes}, \var{comptype}, \var{compname})},
-equivalent to output of the \method{get*()} methods.
-\end{methoddesc}
-
-\begin{methoddesc}[AU_read]{readframes}{n}
-Reads and returns at most \var{n} frames of audio, as a string of
-bytes.  The data will be returned in linear format.  If the original
-data is in u-LAW format, it will be converted.
-\end{methoddesc}
-
-\begin{methoddesc}[AU_read]{rewind}{}
-Rewind the file pointer to the beginning of the audio stream.
-\end{methoddesc}
-
-The following two methods define a term ``position'' which is compatible
-between them, and is otherwise implementation dependent.
-
-\begin{methoddesc}[AU_read]{setpos}{pos}
-Set the file pointer to the specified position.  Only values returned
-from \method{tell()} should be used for \var{pos}.
-\end{methoddesc}
-
-\begin{methoddesc}[AU_read]{tell}{}
-Return current file pointer position.  Note that the returned value
-has nothing to do with the actual position in the file.
-\end{methoddesc}
-
-The following two functions are defined for compatibility with the 
-\refmodule{aifc}, and don't do anything interesting.
-
-\begin{methoddesc}[AU_read]{getmarkers}{}
-Returns \code{None}.
-\end{methoddesc}
-
-\begin{methoddesc}[AU_read]{getmark}{id}
-Raise an error.
-\end{methoddesc}
-
-
-\subsection{AU_write Objects \label{au-write-objects}}
-
-AU_write objects, as returned by \function{open()} above, have the
-following methods:
-
-\begin{methoddesc}[AU_write]{setnchannels}{n}
-Set the number of channels.
-\end{methoddesc}
-
-\begin{methoddesc}[AU_write]{setsampwidth}{n}
-Set the sample width (in bytes.)
-\end{methoddesc}
-
-\begin{methoddesc}[AU_write]{setframerate}{n}
-Set the frame rate.
-\end{methoddesc}
-
-\begin{methoddesc}[AU_write]{setnframes}{n}
-Set the number of frames. This can be later changed, when and if more 
-frames are written.
-\end{methoddesc}
-
-
-\begin{methoddesc}[AU_write]{setcomptype}{type, name}
-Set the compression type and description.
-Only \code{'NONE'} and \code{'ULAW'} are supported on output.
-\end{methoddesc}
-
-\begin{methoddesc}[AU_write]{setparams}{tuple}
-The \var{tuple} should be \code{(\var{nchannels}, \var{sampwidth},
-\var{framerate}, \var{nframes}, \var{comptype}, \var{compname})}, with
-values valid for the \method{set*()} methods.  Set all parameters.
-\end{methoddesc}
-
-\begin{methoddesc}[AU_write]{tell}{}
-Return current position in the file, with the same disclaimer for
-the \method{AU_read.tell()} and \method{AU_read.setpos()} methods.
-\end{methoddesc}
-
-\begin{methoddesc}[AU_write]{writeframesraw}{data}
-Write audio frames, without correcting \var{nframes}.
-\end{methoddesc}
-
-\begin{methoddesc}[AU_write]{writeframes}{data}
-Write audio frames and make sure \var{nframes} is correct.
-\end{methoddesc}
-
-\begin{methoddesc}[AU_write]{close}{}
-Make sure \var{nframes} is correct, and close the file.
-
-This method is called upon deletion.
-\end{methoddesc}
-
-Note that it is invalid to set any parameters after calling 
-\method{writeframes()} or \method{writeframesraw()}.