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:mod:`wave` --- Read and write WAV files
========================================
.. module:: wave
:synopsis: Provide an interface to the WAV sound format.
.. sectionauthor:: Moshe Zadka <moshez@zadka.site.co.il>
.. Documentations stolen from comments in file.
The :mod:`wave` module provides a convenient interface to the WAV sound format.
It does not support compression/decompression, but it does support mono/stereo.
The :mod:`wave` module defines the following function and exception:
.. function:: open(file[, mode])
If *file* is a string, open the file by that name, other treat it as a seekable
file-like object. *mode* can be any of
``'r'``, ``'rb'``
Read only mode.
``'w'``, ``'wb'``
Write only mode.
Note that it does not allow read/write WAV files.
A *mode* of ``'r'`` or ``'rb'`` returns a :class:`Wave_read` object, while a
*mode* of ``'w'`` or ``'wb'`` returns a :class:`Wave_write` object. If *mode*
is omitted and a file-like object is passed as *file*, ``file.mode`` is used as
the default value for *mode* (the ``'b'`` flag is still added if necessary).
.. function:: openfp(file, mode)
A synonym for :func:`.open`, maintained for backwards compatibility.
.. exception:: Error
An error raised when something is impossible because it violates the WAV
specification or hits an implementation deficiency.
.. _wave-read-objects:
Wave_read Objects
-----------------
Wave_read objects, as returned by :func:`.open`, have the following methods:
.. method:: Wave_read.close()
Close the stream, and make the instance unusable. This is called automatically
on object collection.
.. method:: Wave_read.getnchannels()
Returns number of audio channels (``1`` for mono, ``2`` for stereo).
.. method:: Wave_read.getsampwidth()
Returns sample width in bytes.
.. method:: Wave_read.getframerate()
Returns sampling frequency.
.. method:: Wave_read.getnframes()
Returns number of audio frames.
.. method:: Wave_read.getcomptype()
Returns compression type (``'NONE'`` is the only supported type).
.. method:: Wave_read.getcompname()
Human-readable version of :meth:`getcomptype`. Usually ``'not compressed'``
parallels ``'NONE'``.
.. method:: Wave_read.getparams()
Returns a tuple ``(nchannels, sampwidth, framerate, nframes, comptype,
compname)``, equivalent to output of the :meth:`get\*` methods.
.. method:: Wave_read.readframes(n)
Reads and returns at most *n* frames of audio, as a string of bytes.
.. method:: Wave_read.rewind()
Rewind the file pointer to the beginning of the audio stream.
The following two methods are defined for compatibility with the :mod:`aifc`
module, and don't do anything interesting.
.. method:: Wave_read.getmarkers()
Returns ``None``.
.. method:: Wave_read.getmark(id)
Raise an error.
The following two methods define a term "position" which is compatible between
them, and is otherwise implementation dependent.
.. method:: Wave_read.setpos(pos)
Set the file pointer to the specified position.
.. method:: Wave_read.tell()
Return current file pointer position.
.. _wave-write-objects:
Wave_write Objects
------------------
Wave_write objects, as returned by :func:`.open`, have the following methods:
.. method:: Wave_write.close()
Make sure *nframes* is correct, and close the file. This method is called upon
deletion.
.. method:: Wave_write.setnchannels(n)
Set the number of channels.
.. method:: Wave_write.setsampwidth(n)
Set the sample width to *n* bytes.
.. method:: Wave_write.setframerate(n)
Set the frame rate to *n*.
.. method:: Wave_write.setnframes(n)
Set the number of frames to *n*. This will be changed later if more frames are
written.
.. method:: Wave_write.setcomptype(type, name)
Set the compression type and description. At the moment, only compression type
``NONE`` is supported, meaning no compression.
.. method:: Wave_write.setparams(tuple)
The *tuple* should be ``(nchannels, sampwidth, framerate, nframes, comptype,
compname)``, with values valid for the :meth:`set\*` methods. Sets all
parameters.
.. method:: Wave_write.tell()
Return current position in the file, with the same disclaimer for the
:meth:`Wave_read.tell` and :meth:`Wave_read.setpos` methods.
.. method:: Wave_write.writeframesraw(data)
Write audio frames, without correcting *nframes*.
.. method:: Wave_write.writeframes(data)
Write audio frames and make sure *nframes* is correct.
Note that it is invalid to set any parameters after calling :meth:`writeframes`
or :meth:`writeframesraw`, and any attempt to do so will raise
:exc:`wave.Error`.
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