https://github.com/geekuillaume/node-speex-resampler

An implementation of Speex audio resampler on NodeJS with N-API
https://github.com/geekuillaume/node-speex-resampler

Last synced: 25 days ago
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An implementation of Speex audio resampler on NodeJS with N-API

• Host: GitHub
• URL: https://github.com/geekuillaume/node-speex-resampler
• Owner: geekuillaume
• License: mit
• Created: 2020-01-08T14:59:40.000Z (about 5 years ago)
• Default Branch: master
• Last Pushed: 2023-05-12T10:12:05.000Z (over 1 year ago)
• Last Synced: 2024-12-05T21:33:54.200Z (about 1 month ago)
• Language: TypeScript
• Size: 4.58 MB
• Stars: 16
• Watchers: 3
• Forks: 3
• Open Issues: 8
• Metadata Files:
  • Readme: Readme.md
  • License: LICENSE

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README

        
# Speex Resampler

This lib exposes the [Speex resampler](https://speex.org/docs/manual/speex-manual/node7.html) to Javascript with WebAssembly. It doesn't have any dependancy and support NodeJS or a WebContext. Typescript typings are also provided.

From speex creator, the design goals of the resampler are:

- Very fast algorithm

- SIMD-friendly algorithm

- Low memory requirement

- Good *perceptual* quality (and not best SNR)

## How to use

```js

await SpeexResampler.initPromise; // will be resolved once the WASM module has been compiled, before this you cannot call the SpeexResampler processChunk method

const channels = 2; // minimum is 1, no maximum

const inRate = 44100; // frequency in Hz for the input chunk

const outRate = 44000; // frequency in Hz for the target chunk

const quality = 7; // number from 1 to 10, default to 7, 1 is fast but of bad quality, 10 is slow but best quality

// you need a new resampler for every audio stream you want to resample

// it keeps data from previous calls to improve the resampling

const resampler = new SpeexResampler(

  channels,

  audioTest.inRate,

  audioTest.outRate,

  audioTest.quality // optionnal

);

const pcmData = Buffer.from(/* interleaved PCM data in signed 16bits int */);

const res = await resampler.processChunk(pcmData);

// res is also a buffer with interleaved signed 16 bits PCM data

```

You can look at the `src/test.ts` for more information.

Test music by https://www.bensound.com