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-\section{Standard Module \module{aifc}}
-\label{module-aifc}
-\stmodindex{aifc}
-
-This module provides support for reading and writing AIFF and AIFF-C
-files.  AIFF is Audio Interchange File Format, a format for storing
-digital audio samples in a file.  AIFF-C is a newer version of the
-format that includes the ability to compress the audio data.
-\index{Audio Interchange File Format}
-\index{AIFF}
-\index{AIFF-C}
-
-Audio files have a number of parameters that describe the audio data.
-The sampling rate or frame rate is the number of times per second the
-sound is sampled.  The number of channels indicate if the audio is
-mono, stereo, or quadro.  Each frame consists of one sample per
-channel.  The sample size is the size in bytes of each sample.  Thus a
-frame consists of \var{nchannels}*\var{samplesize} bytes, and a
-second's worth of audio consists of
-\var{nchannels}*\var{samplesize}*\var{framerate} bytes.
-
-For example, CD quality audio has a sample size of two bytes (16
-bits), uses two channels (stereo) and has a frame rate of 44,100
-frames/second.  This gives a frame size of 4 bytes (2*2), and a
-second's worth occupies 2*2*44100 bytes, i.e.\ 176,400 bytes.
-
-Module \module{aifc} defines the following function:
-
-\begin{funcdesc}{open}{file, mode}
-Open an AIFF or AIFF-C file and return an object instance with
-methods that are described below.  The argument file is either a
-string naming a file or a file object.  The mode is either the string
-\code{'r'} when the file must be opened for reading, or \code{'w'}
-when the file must be opened for writing.  When used for writing, the
-file object should be seekable, unless you know ahead of time how many
-samples you are going to write in total and use
-\method{writeframesraw()} and \method{setnframes()}.
-\end{funcdesc}
-
-Objects returned by \function{open()} when a file is opened for
-reading have the following methods:
-
-\begin{methoddesc}[aifc]{getnchannels}{}
-Return the number of audio channels (1 for mono, 2 for stereo).
-\end{methoddesc}
-
-\begin{methoddesc}[aifc]{getsampwidth}{}
-Return the size in bytes of individual samples.
-\end{methoddesc}
-
-\begin{methoddesc}[aifc]{getframerate}{}
-Return the sampling rate (number of audio frames per second).
-\end{methoddesc}
-
-\begin{methoddesc}[aifc]{getnframes}{}
-Return the number of audio frames in the file.
-\end{methoddesc}
-
-\begin{methoddesc}[aifc]{getcomptype}{}
-Return a four-character string describing the type of compression used
-in the audio file.  For AIFF files, the returned value is
-\code{'NONE'}.
-\end{methoddesc}
-
-\begin{methoddesc}[aifc]{getcompname}{}
-Return a human-readable description of the type of compression used in
-the audio file.  For AIFF files, the returned value is \code{'not
-compressed'}.
-\end{methoddesc}
-
-\begin{methoddesc}[aifc]{getparams}{}
-Return a tuple consisting of all of the above values in the above
-order.
-\end{methoddesc}
-
-\begin{methoddesc}[aifc]{getmarkers}{}
-Return a list of markers in the audio file.  A marker consists of a
-tuple of three elements.  The first is the mark ID (an integer), the
-second is the mark position in frames from the beginning of the data
-(an integer), the third is the name of the mark (a string).
-\end{methoddesc}
-
-\begin{methoddesc}[aifc]{getmark}{id}
-Return the tuple as described in \method{getmarkers()} for the mark
-with the given \var{id}.
-\end{methoddesc}
-
-\begin{methoddesc}[aifc]{readframes}{nframes}
-Read and return the next \var{nframes} frames from the audio file.  The
-returned data is a string containing for each frame the uncompressed
-samples of all channels.
-\end{methoddesc}
-
-\begin{methoddesc}[aifc]{rewind}{}
-Rewind the read pointer.  The next \method{readframes()} will start from
-the beginning.
-\end{methoddesc}
-
-\begin{methoddesc}[aifc]{setpos}{pos}
-Seek to the specified frame number.
-\end{methoddesc}
-
-\begin{methoddesc}[aifc]{tell}{}
-Return the current frame number.
-\end{methoddesc}
-
-\begin{methoddesc}[aifc]{close}{}
-Close the AIFF file.  After calling this method, the object can no
-longer be used.
-\end{methoddesc}
-
-Objects returned by \function{open()} when a file is opened for
-writing have all the above methods, except for \method{readframes()} and
-\method{setpos()}.  In addition the following methods exist.  The
-\method{get*()} methods can only be called after the corresponding
-\method{set*()} methods have been called.  Before the first
-\method{writeframes()} or \method{writeframesraw()}, all parameters
-except for the number of frames must be filled in.
-
-\begin{methoddesc}[aifc]{aiff}{}
-Create an AIFF file.  The default is that an AIFF-C file is created,
-unless the name of the file ends in \code{'.aiff'} in which case the
-default is an AIFF file.
-\end{methoddesc}
-
-\begin{methoddesc}[aifc]{aifc}{}
-Create an AIFF-C file.  The default is that an AIFF-C file is created,
-unless the name of the file ends in \code{'.aiff'} in which case the
-default is an AIFF file.
-\end{methoddesc}
-
-\begin{methoddesc}[aifc]{setnchannels}{nchannels}
-Specify the number of channels in the audio file.
-\end{methoddesc}
-
-\begin{methoddesc}[aifc]{setsampwidth}{width}
-Specify the size in bytes of audio samples.
-\end{methoddesc}
-
-\begin{methoddesc}[aifc]{setframerate}{rate}
-Specify the sampling frequency in frames per second.
-\end{methoddesc}
-
-\begin{methoddesc}[aifc]{setnframes}{nframes}
-Specify the number of frames that are to be written to the audio file.
-If this parameter is not set, or not set correctly, the file needs to
-support seeking.
-\end{methoddesc}
-
-\begin{methoddesc}[aifc]{setcomptype}{type, name}
-Specify the compression type.  If not specified, the audio data will
-not be compressed.  In AIFF files, compression is not possible.  The
-name parameter should be a human-readable description of the
-compression type, the type parameter should be a four-character
-string.  Currently the following compression types are supported:
-NONE, ULAW, ALAW, G722.
-\index{u-LAW}
-\index{A-LAW}
-\index{G.722}
-\end{methoddesc}
-
-\begin{methoddesc}[aifc]{setparams}{nchannels, sampwidth, framerate, comptype, compname}
-Set all the above parameters at once.  The argument is a tuple
-consisting of the various parameters.  This means that it is possible
-to use the result of a \method{getparams()} call as argument to
-\method{setparams()}.
-\end{methoddesc}
-
-\begin{methoddesc}[aifc]{setmark}{id, pos, name}
-Add a mark with the given id (larger than 0), and the given name at
-the given position.  This method can be called at any time before
-\method{close()}.
-\end{methoddesc}
-
-\begin{methoddesc}[aifc]{tell}{}
-Return the current write position in the output file.  Useful in
-combination with \method{setmark()}.
-\end{methoddesc}
-
-\begin{methoddesc}[aifc]{writeframes}{data}
-Write data to the output file.  This method can only be called after
-the audio file parameters have been set.
-\end{methoddesc}
-
-\begin{methoddesc}[aifc]{writeframesraw}{data}
-Like \method{writeframes()}, except that the header of the audio file
-is not updated.
-\end{methoddesc}
-
-\begin{methoddesc}[aifc]{close}{}
-Close the AIFF file.  The header of the file is updated to reflect the
-actual size of the audio data. After calling this method, the object
-can no longer be used.
-\end{methoddesc}