ewave
-----
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Pure python support for reading and writing extended WAVE formats.
The wave module in Python’s standard library doesn’t support a number of
useful formats and encodings, notably IEEE floats. Ewave is a small,
simple solution written in pure Python that provides a number of
enhanced features:
- Floating point formats
- Extensible formats (> 2 channels, larger bit depths)
- Read and write using memory mapping for simple, speedy access to
large files
- Read directly to numpy arrays
- Data appended to existing files in read/write modes can be
immediately accessed
- Rescaling of data for different encodings and bit depths
- Supports Python context managers for cleaner resource semantics
Requirements and installation
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The current version of ewave requires Python 3.7+ and numpy 1.19+.
To install, run ``pip install .`` in the source directory, or
``pip install ewave``.
Usage
~~~~~
There are some notable differences between the ewave interface and the
standard library wave module. There’s only a single class that manages
both reading and writing, and a number of the properties have changed
names and behaviors. Importantly, the read method by default returns a
numpy memmap to the data in the file. This provides faster access to
large files and allows writing data in place.
For example, to write a second of stereo white noise in floating point
format and then rescale it in place:
.. code:: python
import ewave
from numpy import random
data = random.randn(48000,2)
with ewave.open("myfile.wav","w+",sampling_rate=48000,dtype='f',nchannels=2) as fp:
fp.write(data)
# rescale the data by 50%
fp.read(memmap='r+') *= 0.5
Testing
~~~~~~~
Ewave has been tested on a large number of different WAVE formats and
comes with a fairly extensive unit test suite. To run unit tests on
files, place them in the ‘test’ subdirectory and run ``pytest``. You can
also place unsupported or invalid files in the ‘unsupported’ directory
to test whether ewave rejects them correctly. Bug reports are always
appreciated.
Limitations and related projects
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
‘Exotic’ encodings like A-law and mu-law are not supported. Formats in
which the container size (the bit depth) does not align with a native
data type, including some 24-bit formats, are not supported. Data cannot
be appended to files that terminate in something other than a data
chunk, and multiple data chunks are not supported.
Users interested in access to more complex WAVE and non-WAVE files and
who do not mind external library dependencies should consider one of
these wrappers to libsndfile:
- http://code.google.com/p/libsndfile-python/
- http://www.ar.media.kyoto-u.ac.jp/members/david/softwares/audiolab/
Licence and acknowledgements
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Ewave is based heavily on the original wave module in the Python
standard library and is released under the same Python Software
Foundation Licence (http://opensource.org/licenses/python-2.0)
Information about the WAVE formats supported by this module was
extensively gleaned from
http://www-mmsp.ece.mcgill.ca/documents/audioformats/wave/wave.html.
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