Python-SoXR

High quality, one-dimensional sample-rate conversion library for Python.

Homepage: https://github.com/dofuuz/python-soxr
Documentation: https://python-soxr.readthedocs.io
Release Notes: https://github.com/dofuuz/python-soxr/releases
PyPI: https://pypi.org/project/soxr/

Keywords: Resampler, Audio resampling, Samplerate conversion, DSP(Digital Signal Processing)

Python-SoXR is a Python wrapper of libsoxr.

Installation

pip install soxr

If installation fails, upgrade pip with python -m pip install --upgrade pip and try again.

in Conda environment

conda install -c conda-forge soxr-python

Note: Conda packge name is soxr-python, not python-soxr.

Basic usage

import soxr

y = soxr.resample(
    x,          # input array – mono(1D) or multi-channel(2D of [frame, channel])
    48000,      # input samplerate
    16000       # target samplerate
)

If input is not numpy.ndarray, it will be converted to numpy.ndarray(dtype='float32').
dtype should be one of float32, float64, int16, int32.

Output is numpy.ndarray with same dimension and data type of input.

Streaming usage

Use ResampleStream for real-time processing or very long signal.

import soxr

rs = soxr.ResampleStream(
    44100,              # input samplerate
    16000,              # target samplerate
    1,                  # channel(s)
    dtype='float32'     # data type (default = 'float32')
)

eof = False
while not eof:
    # Get chunk
    ...

    y_chunk = rs.resample_chunk(
        x,              # input aray – mono(1D) or multi-channel(2D of [frame, channel])
        last=eof        # Set True at end of input
    )

Output frame count may not be consistent. This is normal operation.
(ex. [0, 0, 0, 186, 186, 166, 186, 186, 168, ...])

📝 More code examples

Benchmark

Sweep, impulse, speed compairsion with other resamplers for Python.

https://colab.research.google.com/drive/1_xYUs00VWYOAXShB85W1MFWaUjGHfO4K?usp=sharing

Speed comparison summary

Downsampling 10 sec of 48000 Hz to 44100 Hz.
Ran on Google Colab.

Library	Time on CPU (ms)
soxr (HQ)	10.8
torchaudio	13.8
soxr (VHQ)	14.5
scipy.signal.resample	21.3
lilfilter	24.7
julius	31
resampy (kaiser_fast)	108
samplerate (sinc_medium)	223
resampy (kaiser_best)	310
samplerate (sinc_best)	794

Technical detail

For technical details behind resampler, see libsoxr docs.

Python-SoXR package comes with modified version of libsoxr. See changes here.
These changes do not apply to dynamic-linked builds (e.g. conda-forge build).
To check the version of libsoxr, use soxr.__libsoxr_version__.

Credit and License

Python-SoXR is LGPL v2.1+ licensed, following libsoxr's license.

OSS libraries used

libsoxr (LGPLv2.1+)

The SoX Resampler library
https://sourceforge.net/projects/soxr/

Python-SoXR is a Python wrapper of libsoxr.

PFFFT (BSD-like)

PFFFT: a pretty fast FFT.
https://bitbucket.org/jpommier/pffft/

libsoxr dependency.

Release files for soxr 1.1.0

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for soxr 1.1.0
File	Size	Uploaded
soxr-1.1.0.tar.gz	173.1 kB	May 3, 2026	Details

Built distributions (wheels)

Table of built distributions (wheels) for soxr 1.1.0
File	Interpreter	ABI	Platform	Reset
soxr-1.1.0-cp314-cp314t-win_amd64.whl 187.3 kB May 3, 2026	CPython 3.14	CPython 3.14 free-threading	Windows x86-64	Details
soxr-1.1.0-cp314-cp314t-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl 244.6 kB May 3, 2026	CPython 3.14	CPython 3.14 free-threading	Linux glibc 2.27+ x86-64, Linux glibc 2.28+ x86-64	Details
soxr-1.1.0-cp314-cp314t-manylinux_2_26_aarch64.manylinux_2_28_aarch64.whl 211.4 kB May 3, 2026	CPython 3.14	CPython 3.14 free-threading	Linux glibc 2.26+ ARM64, Linux glibc 2.28+ ARM64	Details
soxr-1.1.0-cp314-cp314t-macosx_11_0_arm64.whl 169.3 kB May 3, 2026	CPython 3.14	CPython 3.14 free-threading	macOS 11.0+ ARM64	Details
soxr-1.1.0-cp314-cp314t-macosx_10_15_x86_64.whl 208.0 kB May 3, 2026	CPython 3.14	CPython 3.14 free-threading	macOS 10.15+ x86-64	Details
soxr-1.1.0-cp312-abi3-win_amd64.whl 174.4 kB May 3, 2026	CPython 3.12	abi3	Windows x86-64	Details
soxr-1.1.0-cp312-abi3-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl 240.4 kB May 3, 2026	CPython 3.12	abi3	Linux glibc 2.27+ x86-64, Linux glibc 2.28+ x86-64	Details
soxr-1.1.0-cp312-abi3-manylinux_2_26_aarch64.manylinux_2_28_aarch64.whl 206.5 kB May 3, 2026	CPython 3.12	abi3	Linux glibc 2.26+ ARM64, Linux glibc 2.28+ ARM64	Details
soxr-1.1.0-cp312-abi3-macosx_11_0_arm64.whl 165.5 kB May 3, 2026	CPython 3.12	abi3	macOS 11.0+ ARM64	Details
soxr-1.1.0-cp312-abi3-macosx_10_14_x86_64.whl 204.1 kB May 3, 2026	CPython 3.12	abi3	macOS 10.14+ x86-64	Details
soxr-1.1.0-cp311-cp311-win_amd64.whl 176.8 kB May 3, 2026	CPython 3.11	CPython 3.11	Windows x86-64	Details
soxr-1.1.0-cp311-cp311-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl 245.3 kB May 3, 2026	CPython 3.11	CPython 3.11	Linux glibc 2.28+ x86-64, Linux glibc 2.27+ x86-64	Details
soxr-1.1.0-cp311-cp311-manylinux_2_26_aarch64.manylinux_2_28_aarch64.whl 210.9 kB May 3, 2026	CPython 3.11	CPython 3.11	Linux glibc 2.28+ ARM64, Linux glibc 2.26+ ARM64	Details
soxr-1.1.0-cp311-cp311-macosx_11_0_arm64.whl 167.4 kB May 3, 2026	CPython 3.11	CPython 3.11	macOS 11.0+ ARM64	Details
soxr-1.1.0-cp311-cp311-macosx_10_14_x86_64.whl 205.7 kB May 3, 2026	CPython 3.11	CPython 3.11	macOS 10.14+ x86-64	Details
soxr-1.1.0-cp310-cp310-win_amd64.whl 176.6 kB May 3, 2026	CPython 3.10	CPython 3.10	Windows x86-64	Details
soxr-1.1.0-cp310-cp310-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl 245.0 kB May 3, 2026	CPython 3.10	CPython 3.10	Linux glibc 2.28+ x86-64, Linux glibc 2.27+ x86-64	Details
soxr-1.1.0-cp310-cp310-manylinux_2_26_aarch64.manylinux_2_28_aarch64.whl 210.6 kB May 3, 2026	CPython 3.10	CPython 3.10	Linux glibc 2.28+ ARM64, Linux glibc 2.26+ ARM64	Details
soxr-1.1.0-cp310-cp310-macosx_11_0_arm64.whl 167.0 kB May 3, 2026	CPython 3.10	CPython 3.10	macOS 11.0+ ARM64	Details
soxr-1.1.0-cp310-cp310-macosx_10_14_x86_64.whl 205.3 kB May 3, 2026	CPython 3.10	CPython 3.10	macOS 10.14+ x86-64	Details
soxr-1.1.0-cp39-cp39-win_amd64.whl 177.1 kB May 3, 2026	CPython 3.9	CPython 3.9	Windows x86-64	Details
soxr-1.1.0-cp39-cp39-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl 245.4 kB May 3, 2026	CPython 3.9	CPython 3.9	Linux glibc 2.28+ x86-64, Linux glibc 2.27+ x86-64	Details
soxr-1.1.0-cp39-cp39-manylinux_2_26_aarch64.manylinux_2_28_aarch64.whl 210.9 kB May 3, 2026	CPython 3.9	CPython 3.9	Linux glibc 2.28+ ARM64, Linux glibc 2.26+ ARM64	Details
soxr-1.1.0-cp39-cp39-macosx_11_0_arm64.whl 167.3 kB May 3, 2026	CPython 3.9	CPython 3.9	macOS 11.0+ ARM64	Details
soxr-1.1.0-cp39-cp39-macosx_10_14_x86_64.whl 205.6 kB May 3, 2026	CPython 3.9	CPython 3.9	macOS 10.14+ x86-64	Details

Total release size: 5.2 MB

Release files / soxr-1.1.0.tar.gz

Download URL	soxr-1.1.0.tar.gz
Size	173.1 kB
Tags	Source
SHA-256 checksum How to use checksums	`9f228ae21c78fa9359ca98d8a5e8e91f30639e438e574133dace62c5b5309e44`
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Release files / soxr-1.1.0-cp314-cp314t-win_amd64.whl

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Release files / soxr-1.1.0-cp314-cp314t-macosx_11_0_arm64.whl

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Release files / soxr-1.1.0-cp314-cp314t-macosx_10_15_x86_64.whl

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Release files / soxr-1.1.0-cp312-abi3-win_amd64.whl

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Release files / soxr-1.1.0-cp312-abi3-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl

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Publishing repository: github.com/dofuuz/python-soxr
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Release files / soxr-1.1.0-cp312-abi3-manylinux_2_26_aarch64.manylinux_2_28_aarch64.whl

Download URL	soxr-1.1.0-cp312-abi3-manylinux_2_26_aarch64.manylinux_2_28_aarch64.whl
Size	206.5 kB
Tags	CPython 3.12 Linux glibc 2.26+ ARM64 Linux glibc 2.28+ ARM64 abi3
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Publishing repository: github.com/dofuuz/python-soxr
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Tags	CPython 3.9 macOS 11.0+ ARM64
SHA-256 checksum How to use checksums	`33525740fb7dbed8b09970bf0cd4219b365538845053987b11cc235b20562e09`
BLAKE2b-256 checksum How to use checksums	`9596618ee3e271b0e450e96d7d2ab6b44f4fb09f46ef363f79430ef306b62a71`
Upload date	May 3, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/6.1.0 CPython/3.13.12`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/dofuuz/python-soxr
Publishing commit: github.com/dofuuz/python-soxr/tree/91479780e687fa994daabcff074e5960dc0bd4e2

Workflow

Publishing configuration: github.com/dofuuz/python-soxr/blob/91479780e687fa994daabcff074e5960dc0bd4e2/.github/workflows/build-dist.yml
Publishing logs: github.com/dofuuz/python-soxr/actions/runs/25265168038/attempts/1

Artifact

Subject: soxr-1.1.0-cp39-cp39-macosx_11_0_arm64.whl
SHA-256 checksum: 33525740fb7dbed8b09970bf0cd4219b365538845053987b11cc235b20562e09 Verifying attestations

Release files / soxr-1.1.0-cp39-cp39-macosx_10_14_x86_64.whl

Download URL	soxr-1.1.0-cp39-cp39-macosx_10_14_x86_64.whl
Size	205.6 kB
Tags	CPython 3.9 macOS 10.14+ x86-64
SHA-256 checksum How to use checksums	`318925f7281df61dfa7f17fe343952eb10cefd3954f2423a733fabe3a517bab2`
BLAKE2b-256 checksum How to use checksums	`b94c8de382d55875e8f5474eb36af08e24e778c9197bfa8b632e8de9c6cd473d`
Upload date	May 3, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/6.1.0 CPython/3.13.12`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/dofuuz/python-soxr
Publishing commit: github.com/dofuuz/python-soxr/tree/91479780e687fa994daabcff074e5960dc0bd4e2

Workflow

Publishing configuration: github.com/dofuuz/python-soxr/blob/91479780e687fa994daabcff074e5960dc0bd4e2/.github/workflows/build-dist.yml
Publishing logs: github.com/dofuuz/python-soxr/actions/runs/25265168038/attempts/1

Artifact

Subject: soxr-1.1.0-cp39-cp39-macosx_10_14_x86_64.whl
SHA-256 checksum: 318925f7281df61dfa7f17fe343952eb10cefd3954f2423a733fabe3a517bab2 Verifying attestations