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 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 License-File: LICENSE Requires-Dist: cffi (>=1.0) Provides-Extra: numpy Requires-Dist: numpy ; extra == 'numpy' python-soundfile ================ |version| |python| |status| |license| |contributors| |downloads| The `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 `__, 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 `__, 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 `_. .. _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 `__, for example WAV, FLAC, OGG and MAT files (see `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 `__ 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 `__. 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 `__ 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