Riffusion

Riffusion is a library for real-time music and audio generation with stable diffusion.

Read about it at https://www.riffusion.com/about and try it at https://www.riffusion.com/.

This repository contains the core riffusion image and audio processing code and supporting apps, including:

• diffusion pipeline that performs prompt interpolation combined with image conditioning
• package for (approximately) converting between spectrogram images and audio clips
• interactive playground using streamlit
• command-line tool for common tasks
• flask server to provide model inference via API
• various third party integrations
• test suite

Related repositories:

• Web app: https://github.com/riffusion/riffusion-app
• Model checkpoint: https://huggingface.co/riffusion/riffusion-model-v1

Citation

If you build on this work, please cite it as follows:

@article{Forsgren_Martiros_2022,
  author = {Forsgren, Seth* and Martiros, Hayk*},
  title = {{Riffusion - Stable diffusion for real-time music generation}},
  url = {https://riffusion.com/about},
  year = {2022}
}

Install

Tested with Python 3.9 + 3.10 and diffusers 0.9.0.

It's highly recommended to set up a virtual Python environment with conda or virtualenv:

conda create --name riffusion python=3.9
conda activate riffusion

Install Python dependencies:

python -m pip install -r requirements.txt

In order to use audio formats other than WAV, ffmpeg is required.

sudo apt-get install ffmpeg  # linux
brew install ffmpeg  # mac
conda install -c conda-forge ffmpeg  # conda

If torchaudio has no audio backend, see this issue.

Guides:

• Windows Simple Instructions

Backends

CUDA

cuda is the recommended and most performant backend.

To use with CUDA, make sure you have torch and torchaudio installed with CUDA support. See the install guide or stable wheels. Check with:

import torch
torch.cuda.is_available()

To generate audio in real-time, you need a GPU that can run stable diffusion with approximately 50 steps in under five seconds, such as a 3090 or A10G.

Also see this issue for help.

CPU

cpu works but is quite slow.

MPS

The mps backend on Apple Silicon is supported for inference but some operations fall back to CPU, particularly for audio processing. You may need to set PYTORCH_ENABLE_MPS_FALLBACK=1.

In addition, this backend is not deterministic.

Command-line interface

Riffusion comes with a command line interface for performing common tasks.

See available commands:

python -m riffusion.cli -h

Get help for a specific command:

python -m riffusion.cli image-to-audio -h

Execute:

python -m riffusion.cli image-to-audio --image spectrogram_image.png --audio clip.wav

Streamlit playground

Riffusion also has a streamlit app for interactive use and exploration. This app is called the Riffusion Playground.

Run with:

python -m streamlit run riffusion/streamlit/playground.py --browser.serverAddress 127.0.0.1 --browser.serverPort 8501

And access at http://127.0.0.1:8501/

Run the model server

Riffusion can be run as a flask server that provides inference via API. Run with:

python -m riffusion.server --host 127.0.0.1 --port 3013

You can specify --checkpoint with your own directory or huggingface ID in diffusers format.

Use the --device argument to specify the torch device to use.

The model endpoint is now available at http://127.0.0.1:3013/run_inference via POST request.

Example input (see InferenceInput for the API):

{
  "alpha": 0.75,
  "num_inference_steps": 50,
  "seed_image_id": "og_beat",

  "start": {
    "prompt": "church bells on sunday",
    "seed": 42,
    "denoising": 0.75,
    "guidance": 7.0
  },

  "end": {
    "prompt": "jazz with piano",
    "seed": 123,
    "denoising": 0.75,
    "guidance": 7.0
  }
}

Example output (see InferenceOutput for the API):

{
  "image": "< base64 encoded JPEG image >",
  "audio": "< base64 encoded MP3 clip >"
}

Test

Tests live in the test/ directory and are implemented with unittest.

To run all tests:

python -m unittest test/*_test.py

To run a single test:

python -m unittest test.audio_to_image_test

To preserve temporary outputs for debugging, set RIFFUSION_TEST_DEBUG:

RIFFUSION_TEST_DEBUG=1 python -m unittest test.audio_to_image_test

To run a single test case within a test:

python -m unittest test.audio_to_image_test -k AudioToImageTest.test_stereo

To run tests using a specific torch device, set RIFFUSION_TEST_DEVICE. Tests should pass with cpu, cuda, and mps backends.

Development

Install additional packages for dev with python -m pip install -r dev_requirements.txt.

• Linter: ruff
• Formatter: black
• Type checker: mypy

These are configured in pyproject.toml.

The results of mypy ., black ., and ruff . must be clean to accept a PR.

CI is run through GitHub Actions from .github/workflows/ci.yml.

Contributions are welcome through opening pull requests.