Node-Soxr

Node.js native addon wrapper for libsoxr (high quality and high performance offline audio resampler).

Installation

Requirements:

• OpenMP runtime

  (Pre-built binaries for Linux systems are linked with GCC's OpenMP runtime (libgomp1), Windows and Mac is configured to link LLVM's OpenMP runtime by default. - If you would like to use a different OpenMP library, please edit the linker flags in the binding.gyp file accordingly.)

• npm

• Node.js >= 24 (Binaries are built on LTS node. Please rebuild from source manually if you want to target older node versions.)

Setup:

1. Install with npm:

   npm i node-soxr

   Note: the npm package includes pre-built binaries for:

   • Linux (incl. builds for all architectures supported by LTS Node.js - based on glibc),
   • Alpine containers (all Node.js LTS supported architectures except s390x - can be built manually via running build.sh - based on musl),
   • Windows (x64 only),
   • and MacOS (x64, arm64 - without SIMD support).

   For different operating systems and architectures (ex. Windows - arm64): please make sure to install the necessary build tools on your system so the corresponding binaries can be built on your system at install time - if the required build tools are missing install will fail.

Usage:

General usage:

import { SoxrWrapper, SoxrQuality } from "node-soxr";

const soxr = new SoxrWrapper(48000, 44100, 2);
const resampledData = soxr.resample(data);
soxr.destroy();

With multi-threading enabled:

import * as NodeSoxr from "node-soxr";

const maxThreads = 8;
//Call this once to set the global limit - desirably on your module init
NodeSoxr.setGlobalMaximumThreadCount(maxThreads);

const soxr = new NodeSoxr.SoxrWrapper(48000, 44100, 2);
const resampledData = soxr.resample(data);
soxr.destroy();

Using utility functions:

import * as NodeSoxr from "node-soxr";

const inputSampleRate = 48000;
const outputSampleRate = 44100;
const numberOfAudioChannels = 5;

const soxr = new NodeSoxr.SoxrWrapper(
  inputSampleRate,
  outputSampleRate,
  numberOfAudioChannels,
  NodeSoxr.SoxrQuality.HIGH_16,
);

const inputData = NodeSoxr.interleaveChannelData(...channelDataArray);
const resampledData = soxr.resample(inputData);
const outputData = NodeSoxr.deinterleaveChannelData(
  resampledData,
  numberOfAudioChannels,
);

soxr.destroy();

For more extensive examples please click here.

At the moment only CBR resampling is supported. (This might not change.)

Building manually:

To build the library you may run npm run build, or use the provided shell script to manually build the library (sh ./build.sh). To see details about the flags that can be used with the build script please run sh ./build.sh -h or sh ./build.sh --help.

Dependencies:

• Python3
• C/C++ build tools (installing through the Node.js installer is recommended)
• An OpenMP runtime:
  • on Windows it's shipped with MSVC,
  • on Mac please use brew install libomp,
  • on Linux please use sudo apt update && sudo apt install libgomp1,
  • for other environments please use your desired OpenMP runtime and change the linker flags in the binding.gyp file if needed.

Contributions:

The C++ standard used for this project is C++ 17.

All contributions are welcome. In order to contribute, please make a fork of this project and make a pull request to the main branch of this project once you added your changes.

Licensing/Credits:

This library is a wrapper built on top of the source code of the SoX Resampler Library.

This project is licensed under the terms of the LGPL 2.1 - see the LICENSE file for details.

For additional credits/licensing please refer to the notes section in the LICENSE.