mirror of
https://github.com/python/cpython.git
synced 2025-10-31 10:26:02 +00:00
212 lines
5 KiB
ReStructuredText
212 lines
5 KiB
ReStructuredText
: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.
|
|
|
|
**Source code:** :source:`Lib/wave.py`
|
|
|
|
--------------
|
|
|
|
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=None)
|
|
|
|
If *file* is a string, open the file by that name, otherwise 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).
|
|
|
|
If you pass in a file-like object, the wave object will not close it when its
|
|
:meth:`close` method is called; it is the caller's responsibility to close
|
|
the file object.
|
|
|
|
|
|
.. 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 if it was opened by :mod:`wave`, 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 if it was opened by
|
|
:mod:`wave`. This method is called upon object collection.
|
|
|
|
|
|
.. 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*.
|
|
|
|
.. versionchanged:: 3.2
|
|
A non-integral input to this method is rounded to the nearest
|
|
integer.
|
|
|
|
|
|
.. 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`.
|
|
|