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authorFred Drake <fdrake@acm.org>1998-05-07 01:49:07 (GMT)
committerFred Drake <fdrake@acm.org>1998-05-07 01:49:07 (GMT)
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-\section{Built-in Module \module{sunaudiodev}}
-\label{module-sunaudiodev}
-\bimodindex{sunaudiodev}
-
-This module allows you to access the sun audio interface. The sun
-audio hardware is capable of recording and playing back audio data
-in u-LAW\index{u-LAW} format with a sample rate of 8K per second. A
-full description can be found in the \manpage{audio}{7I} manual page.
-
-The module defines the following variables and functions:
-
-\begin{excdesc}{error}
-This exception is raised on all errors. The argument is a string
-describing what went wrong.
-\end{excdesc}
-
-\begin{funcdesc}{open}{mode}
-This function opens the audio device and returns a sun audio device
-object. This object can then be used to do I/O on. The \var{mode} parameter
-is one of \code{'r'} for record-only access, \code{'w'} for play-only
-access, \code{'rw'} for both and \code{'control'} for access to the
-control device. Since only one process is allowed to have the recorder
-or player open at the same time it is a good idea to open the device
-only for the activity needed. See \manpage{audio}{7I} for details.
-\end{funcdesc}
-
-
-\subsection{Audio Device Objects}
-\label{audio-device-objects}
-
-The audio device objects are returned by \function{open()} define the
-following methods (except \code{control} objects which only provide
-\method{getinfo()}, \method{setinfo()} and \method{drain()}):
-
-\begin{methoddesc}[audio device]{close}{}
-This method explicitly closes the device. It is useful in situations
-where deleting the object does not immediately close it since there
-are other references to it. A closed device should not be used again.
-\end{methoddesc}
-
-\begin{methoddesc}[audio device]{drain}{}
-This method waits until all pending output is processed and then returns.
-Calling this method is often not necessary: destroying the object will
-automatically close the audio device and this will do an implicit drain.
-\end{methoddesc}
-
-\begin{methoddesc}[audio device]{flush}{}
-This method discards all pending output. It can be used avoid the
-slow response to a user's stop request (due to buffering of up to one
-second of sound).
-\end{methoddesc}
-
-\begin{methoddesc}[audio device]{getinfo}{}
-This method retrieves status information like input and output volume,
-etc. and returns it in the form of
-an audio status object. This object has no methods but it contains a
-number of attributes describing the current device status. The names
-and meanings of the attributes are described in
-\file{/usr/include/sun/audioio.h} and in the \manpage{audio}{7I}
-manual page. Member names
-are slightly different from their \C{} counterparts: a status object is
-only a single structure. Members of the \cdata{play} substructure have
-\samp{o_} prepended to their name and members of the \cdata{record}
-structure have \samp{i_}. So, the \C{} member \cdata{play.sample_rate} is
-accessed as \member{o_sample_rate}, \cdata{record.gain} as \member{i_gain}
-and \cdata{monitor_gain} plainly as \member{monitor_gain}.
-\end{methoddesc}
-
-\begin{methoddesc}[audio device]{ibufcount}{}
-This method returns the number of samples that are buffered on the
-recording side, i.e.\ the program will not block on a
-\function{read()} call of so many samples.
-\end{methoddesc}
-
-\begin{methoddesc}[audio device]{obufcount}{}
-This method returns the number of samples buffered on the playback
-side. Unfortunately, this number cannot be used to determine a number
-of samples that can be written without blocking since the kernel
-output queue length seems to be variable.
-\end{methoddesc}
-
-\begin{methoddesc}[audio device]{read}{size}
-This method reads \var{size} samples from the audio input and returns
-them as a Python string. The function blocks until enough data is available.
-\end{methoddesc}
-
-\begin{methoddesc}[audio device]{setinfo}{status}
-This method sets the audio device status parameters. The \var{status}
-parameter is an device status object as returned by \function{getinfo()} and
-possibly modified by the program.
-\end{methoddesc}
-
-\begin{methoddesc}[audio device]{write}{samples}
-Write is passed a Python string containing audio samples to be played.
-If there is enough buffer space free it will immediately return,
-otherwise it will block.
-\end{methoddesc}
-
-There is a companion module,
-\module{SUNAUDIODEV}\refstmodindex{SUNAUDIODEV}, which defines useful
-symbolic constants like \constant{MIN_GAIN}, \constant{MAX_GAIN},
-\constant{SPEAKER}, etc. The names of the constants are the same names
-as used in the \C{} include file \code{<sun/audioio.h>}, with the
-leading string \samp{AUDIO_} stripped.
-
-Useability of the control device is limited at the moment, since there
-is no way to use the ``wait for something to happen'' feature the
-device provides.