Metadata-Version: 2.1
Name: soundfile
Version: 0.12.1
Summary: An audio library based on libsndfile, CFFI and NumPy
Home-page: https://github.com/bastibe/python-soundfile
Author: Bastian Bechtold
Author-email: basti@bastibe.de
License: BSD 3-Clause License
Description: python-soundfile
        ================
        
        |version| |python| |status| |license|
        
        |contributors| |downloads|
        
        The `soundfile <https://github.com/bastibe/python-soundfile>`__ module is an audio
        library based on libsndfile, CFFI and NumPy. Full documentation is
        available on https://python-soundfile.readthedocs.io/.
        
        The ``soundfile`` module can read and write sound files. File reading/writing is
        supported through `libsndfile <http://www.mega-nerd.com/libsndfile/>`__,
        which is a free, cross-platform, open-source (LGPL) library for reading
        and writing many different sampled sound file formats that runs on many
        platforms including Windows, OS X, and Unix. It is accessed through
        `CFFI <https://cffi.readthedocs.io/>`__, which is a foreign function
        interface for Python calling C code. CFFI is supported for CPython 2.6+,
        3.x and PyPy 2.0+. The ``soundfile`` module represents audio data as NumPy arrays.
        
        | python-soundfile is BSD licensed (BSD 3-Clause License).
        | (c) 2013, Bastian Bechtold
        
        
        |open-issues| |closed-issues| |open-prs| |closed-prs|
        
        .. |contributors| image:: https://img.shields.io/github/contributors/bastibe/python-soundfile.svg
        .. |version| image:: https://img.shields.io/pypi/v/soundfile.svg
        .. |python| image:: https://img.shields.io/pypi/pyversions/soundfile.svg
        .. |license| image:: https://img.shields.io/github/license/bastibe/python-soundfile.svg
        .. |downloads| image:: https://img.shields.io/pypi/dm/soundfile.svg
        .. |open-issues| image:: https://img.shields.io/github/issues/bastibe/python-soundfile.svg
        .. |closed-issues| image:: https://img.shields.io/github/issues-closed/bastibe/python-soundfile.svg
        .. |open-prs| image:: https://img.shields.io/github/issues-pr/bastibe/python-soundfile.svg
        .. |closed-prs| image:: https://img.shields.io/github/issues-pr-closed/bastibe/python-soundfile.svg
        .. |status| image:: https://img.shields.io/pypi/status/soundfile.svg
        
        Breaking Changes
        ----------------
        
        The ``soundfile`` module has evolved rapidly in the past. Most
        notably, we changed the import name from ``import pysoundfile`` to
        ``import soundfile`` in 0.7. In 0.6, we cleaned up many small
        inconsistencies, particularly in the the ordering and naming of
        function arguments and the removal of the indexing interface.
        
        In 0.8.0, we changed the default value of ``always_2d`` from ``True``
        to ``False``. Also, the order of arguments of the ``write`` function
        changed from ``write(data, file, ...)`` to ``write(file, data, ...)``.
        
        In 0.9.0, we changed the ``ctype`` arguments of the ``buffer_*``
        methods to ``dtype``, using the Numpy ``dtype`` notation. The old
        ``ctype`` arguments still work, but are now officially deprecated.
        
        In 0.12.0, we changed the load order of the libsndfile library. Now,
        the packaged libsndfile in the platform-specific wheels is tried
        before falling back to any system-provided libsndfile. If you would
        prefer using the system-provided libsndfile, install the source
        package or source wheel instead of the platform-specific wheels.
        
        Installation
        ------------
        
        The ``soundfile`` module depends on the Python packages CFFI and NumPy, and the
        library libsndfile.
        
        In a modern Python, you can use ``pip install soundfile`` to download
        and install the latest release of the ``soundfile`` module and its
        dependencies. On Windows (64/32) and OS X (Intel/ARM) and Linux 64,
        this will also install a current version of the library libsndfile. If
        you install the source module, you need to install libsndfile using
        your distribution's package manager, for example ``sudo apt install
        libsndfile1``.
        
        If you are running on an unusual platform or if you are using an older
        version of Python, you might need to install NumPy and CFFI separately,
        for example using the Anaconda_ package manager or the `Unofficial Windows
        Binaries for Python Extension Packages <http://www.lfd.uci.edu/~gohlke/pythonlibs/>`_.
        
        .. _Anaconda: https://www.continuum.io/downloads
        
        Building
        --------
        
        ``Soundfile`` itself does not contain any compiled code and can be
        bundled into a wheel with the usual ``python setup.py bdist_wheel``.
        However, ``soundfile`` relies on libsndfile, and optionally ships its
        own copy of libsndfile in the wheel.
        
        To build a binary wheel that contains libsndfile, make sure to
        checkout and update the ``_soundfile_data`` submodule, then run
        ``python setup.py bdist_wheel`` as usual. If the resulting file size
        of the wheel is around one megabyte, a matching libsndfile has been
        bundled (without libsndfile, it's around 25 KB).
        
        To build binary wheels for all supported platforms, run ``python
        build_wheels.py``, which will ``python setup.py bdist_wheel`` for each
        of the platforms we have precompiled libsndfiles for.
        
        Error Reporting
        ---------------
        
        In case of API usage errors the ``soundfile`` module raises the usual `ValueError` or `TypeError`.
        
        For other errors `SoundFileError` is raised (used to be `RuntimeError`).
        Particularly, a `LibsndfileError` subclass of this exception is raised on
        errors reported by the libsndfile library. In that case the exception object
        provides the libsndfile internal error code in the `LibsndfileError.code` attribute and the raw
        libsndfile error message in the `LibsndfileError.error_string` attribute.
        
        Read/Write Functions
        --------------------
        
        Data can be written to the file using `soundfile.write()`, or read from
        the file using `soundfile.read()`. The ``soundfile`` module can open all file formats
        that `libsndfile supports
        <http://www.mega-nerd.com/libsndfile/#Features>`__, for example WAV,
        FLAC, OGG and MAT files (see `Known Issues <https://github.com/bastibe/python-soundfile#known-issues>`__ below about writing OGG files).
        
        Here is an example for a program that reads a wave file and copies it
        into an FLAC file:
        
        .. code:: python
        
            import soundfile as sf
        
            data, samplerate = sf.read('existing_file.wav')
            sf.write('new_file.flac', data, samplerate)
        
        Block Processing
        ----------------
        
        Sound files can also be read in short, optionally overlapping blocks
        with `soundfile.blocks()`.
        For example, this calculates the signal level for each block of a long
        file:
        
        .. code:: python
        
           import numpy as np
           import soundfile as sf
        
           rms = [np.sqrt(np.mean(block**2)) for block in
                  sf.blocks('myfile.wav', blocksize=1024, overlap=512)]
        
        ``SoundFile`` Objects
        ---------------------
        
        Sound files can also be opened as `SoundFile` objects. Every
        `SoundFile` has a specific sample rate, data format and a set number of
        channels.
        
        If a file is opened, it is kept open for as long as the `SoundFile`
        object exists. The file closes when the object is garbage collected,
        but you should use the `SoundFile.close()` method or the
        context manager to close the file explicitly:
        
        .. code:: python
        
           import soundfile as sf
        
           with sf.SoundFile('myfile.wav', 'r+') as f:
               while f.tell() < f.frames:
                   pos = f.tell()
                   data = f.read(1024)
                   f.seek(pos)
                   f.write(data*2)
        
        All data access uses frames as index. A frame is one discrete time-step
        in the sound file. Every frame contains as many samples as there are
        channels in the file.
        
        RAW Files
        ---------
        
        `soundfile.read()` can usually auto-detect the file type of sound files. This
        is not possible for RAW files, though:
        
        .. code:: python
        
           import soundfile as sf
        
           data, samplerate = sf.read('myfile.raw', channels=1, samplerate=44100,
                                      subtype='FLOAT')
        
        Note that on x86, this defaults to ``endian='LITTLE'``. If you are
        reading big endian data (mostly old PowerPC/6800-based files), you
        have to set ``endian='BIG'`` accordingly.
        
        You can write RAW files in a similar way, but be advised that in most
        cases, a more expressive format is better and should be used instead.
        
        Virtual IO
        ----------
        
        If you have an open file-like object, `soundfile.read()` can open it just like
        regular files:
        
        .. code:: python
        
            import soundfile as sf
            with open('filename.flac', 'rb') as f:
                data, samplerate = sf.read(f)
        
        Here is an example using an HTTP request:
        
        .. code:: python
        
            import io
            import soundfile as sf
            from urllib.request import urlopen
        
            url = "http://tinyurl.com/shepard-risset"
            data, samplerate = sf.read(io.BytesIO(urlopen(url).read()))
        
        Note that the above example only works with Python 3.x.
        For Python 2.x support, replace the third line with:
        
        .. code:: python
        
            from urllib2 import urlopen
        
        Known Issues
        ------------
        
        Writing to OGG files can result in empty files with certain versions of libsndfile. See `#130 <https://github.com/bastibe/python-soundfile/issues/130>`__ for news on this issue.
        
        If using a Buildroot style system, Python has trouble locating ``libsndfile.so`` file, which causes python-soundfile to not be loaded. This is apparently a bug in `python <https://bugs.python.org/issue13508>`__. For the time being, in ``soundfile.py``, you can remove the call to ``_find_library`` and hardcode the location of the ``libsndfile.so`` in ``_ffi.dlopen``. See `#258 <https://github.com/bastibe/python-soundfile/issues/258>`__ for discussion on this issue.
        
        News
        ----
        
        2013-08-27 V0.1.0 Bastian Bechtold:
            Initial prototype. A simple wrapper for libsndfile in Python
        
        2013-08-30 V0.2.0 Bastian Bechtold:
            Bugfixes and more consistency with PySoundCard
        
        2013-08-30 V0.2.1 Bastian Bechtold:
            Bugfixes
        
        2013-09-27 V0.3.0 Bastian Bechtold:
            Added binary installer for Windows, and context manager
        
        2013-11-06 V0.3.1 Bastian Bechtold:
            Switched from distutils to setuptools for easier installation
        
        2013-11-29 V0.4.0 Bastian Bechtold:
            Thanks to David Blewett, now with Virtual IO!
        
        2013-12-08 V0.4.1 Bastian Bechtold:
            Thanks to Xidorn Quan, FLAC files are not float32 any more.
        
        2014-02-26 V0.5.0 Bastian Bechtold:
            Thanks to Matthias Geier, improved seeking and a flush() method.
        
        2015-01-19 V0.6.0 Bastian Bechtold:
            A big, big thank you to Matthias Geier, who did most of the work!
        
            - Switched to ``float64`` as default data type.
            - Function arguments changed for consistency.
            - Added unit tests.
            - Added global `read()`, `write()`, `blocks()` convenience
              functions.
            - Documentation overhaul and hosting on readthedocs.
            - Added ``'x'`` open mode.
            - Added `tell()` method.
            - Added ``__repr__()`` method.
        
        2015-04-12 V0.7.0 Bastian Bechtold:
            Again, thanks to Matthias Geier for all of his hard work, but also
            Nils Werner and Whistler7 for their many suggestions and help.
        
            - Renamed ``import pysoundfile`` to ``import soundfile``.
            - Installation through pip wheels that contain the necessary
              libraries for OS X and Windows.
            - Removed ``exclusive_creation`` argument to `write()`.
            - Added `truncate()` method.
        
        2015-10-20 V0.8.0 Bastian Bechtold:
            Again, Matthias Geier contributed a whole lot of hard work to this
            release.
        
            - Changed the default value of ``always_2d`` from ``True`` to
              ``False``.
            - Numpy is now optional, and only loaded for ``read`` and
              ``write``.
            - Added `SoundFile.buffer_read()` and
              `SoundFile.buffer_read_into()` and `SoundFile.buffer_write()`,
              which read/write raw data without involving Numpy.
            - Added `info()` function that returns metadata of a sound file.
            - Changed the argument order of the `write()` function from
              ``write(data, file, ...)`` to ``write(file, data, ...)``
        
            And many more minor bug fixes.
        
        2017-02-02 V0.9.0 Bastian Bechtold:
            Thank you, Matthias Geier, Tomas Garcia, and Todd, for contributions
            for this release.
        
            - Adds support for ALAC files.
            - Adds new member ``__libsndfile_version__``
            - Adds number of frames to ``info`` class
            - Adds ``dtype`` argument to ``buffer_*`` methods
            - Deprecates ``ctype`` argument to ``buffer_*`` methods
            - Adds official support for Python 3.6
        
            And some minor bug fixes.
        
        2017-11-12 V0.10.0 Bastian Bechtold:
            Thank you, Matthias Geier, Toni Barth, Jon Peirce, Till Hoffmann,
            and Tomas Garcia, for contributions to this release.
        
            - Should now work with cx_freeze.
            - Several documentation fixes in the README.
            - Removes deprecated ``ctype`` argument in favor of ``dtype`` in ``buffer_*()``.
            - Adds `SoundFile.frames` in favor of now-deprecated ``__len__()``.
            - Improves performance of `blocks()` and `SoundFile.blocks()`.
            - Improves import time by using CFFI's out of line mode.
            - Adds a build script for building distributions.
        
        2022-06-02 V0.11.0 Bastian Bechtold:
            Thank you, tennies, Hannes Helmholz, Christoph Boeddeker, Matt
            Vollrath, Matthias Geier, Jacek Konieczny, Boris Verkhovskiy,
            Jonas Haag, Eduardo Moguillansky, Panos Laganakos, Jarvy Jarvison,
            Domingo Ramirez, Tim Chagnon, Kyle Benesch, Fabian-Robert Stöter,
            Joe Todd
        
            - MP3 support
            - Adds binary wheels for macOS M1
            - Improves compatibility with macOS, specifically for M1 machines
            - Fixes file descriptor open for binary wheels on Windows and Python 3.5+
            - Updates libsndfile to v1.1.0
            - Adds get_strings method for retrieving all metadata at once
            - Improves documentation, error messages and tests
            - Displays length of very short files in samples
            - Supports the file system path protocol (pathlib et al)
        
        2023-02-02 V0.12.0 Bastian Bechtold
            Thank you, Barabazs, Andrew Murray, Jon Peirce, for contributions
            to this release.
        
            - Updated libsndfile to v1.2.0
            - Improves precompiled library location, especially with py2app or cx-freeze.
            - Now provide binary wheels for Linux x86_64
            - Now prefers packaged libsndfile over system-installed libsndfile
        
        2023-02-15 V0.12.1 Bastian Bechtold
            Thank you, funnypig, for the bug report
        
            - Fixed typo on library location detection if no packaged lib and
              no system lib was found
        
Keywords: audio,libsndfile
Platform: any
Classifier: Development Status :: 5 - Production/Stable
Classifier: Intended Audience :: Developers
Classifier: Intended Audience :: Science/Research
Classifier: License :: OSI Approved :: BSD License
Classifier: Natural Language :: English
Classifier: Operating System :: OS Independent
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 2
Classifier: Programming Language :: Python :: Implementation :: PyPy
Classifier: Programming Language :: Python :: Implementation :: CPython
Classifier: Topic :: Multimedia :: Sound/Audio
Description-Content-Type: text/x-rst
Provides-Extra: numpy
