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Include more information from the docstrings.

This commit is contained in:
Fred Drake 2000-10-06 21:07:14 +00:00
parent 3a844a2822
commit c2bac8745d
1 changed files with 49 additions and 7 deletions
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56
Doc/lib/libsunau.tex
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@ -5,9 +5,28 @@
\sectionauthor{Moshe Zadka}{mzadka@geocities.com}
\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}.
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:
@ -36,10 +55,31 @@ 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 item:
The \module{sunau} module defines the following data items:
\begin{datadesc}{AUDIO_FILE_MAGIC}
An integer every valid Sun AU file begins with a big-endian encoding of.
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}
@ -98,11 +138,13 @@ 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.
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.
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