---
license: mit
tags:
- audio
---

# SNAC 🍿

Multi-**S**cale **N**eural **A**udio **C**odec (SNAC) compressess audio into discrete codes at a low bitrate.

See GitHub repository: https://github.com/hubertsiuzdak/snac/

## Overview

SNAC encodes audio into hierarchical tokens similarly to SoundStream, EnCodec, and DAC. However, SNAC introduces a simple change where coarse tokens are sampled less frequently,
covering a broader time span.

This model compresses 44 kHz audio into discrete codes at a 2.6 kbps bitrate. It uses 4 RVQ levels with token rates of 14, 29, 57, and
115 Hz.

## Usage

Install it using:

```bash
pip install snac
```
To encode (and reconstruct) audio with SNAC in Python, use the following code:

```python
import torch
from snac import SNAC

model = SNAC.from_pretrained("hubertsiuzdak/snac_44khz").eval().cuda()
audio = torch.randn(1, 1, 44100).cuda()  # B, 1, T

with torch.inference_mode():
    audio_hat, _, codes, _, _ = model(audio)
```

⚠️ Note that `codes` is a list of token sequences of variable lengths, each corresponding to a different temporal
resolution.

```
>>> [code.shape[1] for code in codes]
[16, 32, 64, 128]
```

## Acknowledgements

Module definitions are adapted from the [Descript Audio Codec](https://github.com/descriptinc/descript-audio-codec).