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authorGeorg Brandl <georg@python.org>2007-08-15 14:28:01 (GMT)
committerGeorg Brandl <georg@python.org>2007-08-15 14:28:01 (GMT)
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+.. % Documentations stolen and LaTeX'ed from comments in file.
+
+
+: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>
+
+
+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`.
+