python-samplerate

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This is a wrapper around Erik de Castro Lopo’s libsamplerate_ (aka Secret Rabbit Code) for high-quality sample rate conversion.

It implements all three APIs <http://www.mega-nerd.com/libsamplerate/api.html>_ available in libsamplerate_:

• Simple API: for resampling a large chunk of data with a single library call
• Full API: for obtaining the resampled signal from successive chunks of data
• Callback API: like Full API, but input samples are provided by a callback function

The libsamplerate_ library is statically built together with the python bindings using pybind11 <https://github.com/pybind/pybind11/>_.

Installation

$ pip install samplerate

Binary wheels of libsamplerate_ for macOS and Windows (64 bit) are available. For other systems, a C++ 14 or above compiler is required to build the package.

Usage

.. code-block:: python

import numpy as np import samplerate

Synthesize data

fs = 1000. t = np.arange(fs * 2) / fs input_data = np.sin(2 * np.pi * 5 * t)

Simple API

ratio = 1.5 converter = ‘sinc_best’ # or ‘sinc_fastest’, … output_data_simple = samplerate.resample(input_data, ratio, converter)

Full API

resampler = samplerate.Resampler(converter, channels=1) output_data_full = resampler.process(input_data, ratio, end_of_input=True)

The result is the same for both APIs.

assert np.allclose(output_data_simple, output_data_full)

See samplerate.CallbackResampler for the Callback API, or

examples/play_modulation.py for an example.

See samplerate.resample, samplerate.Resampler, and samplerate.CallbackResampler in the API documentation for details.

See also

• scikits.samplerate <https://pypi.python.org/pypi/scikits.samplerate>_ implements only the Simple API and uses Cython <http://cython.org/>_ for extern calls. The resample function of scikits.samplerate and this package share the same function signature for compatiblity.

• resampy <https://github.com/bmcfee/resampy>_: sample rate conversion in Python + Cython.

License

This project is licensed under the MIT license <https://opensource.org/licenses/MIT>_.

As of version 0.1.9, libsamplerate_ is licensed under the 2-clause BSD license <https://opensource.org/licenses/BSD-2-Clause>_.

.. _libsamplerate: http://www.mega-nerd.com/libsamplerate/