aus

This is a crate for audio processing and analysis in Rust, combining new functionality with aggregated functionality from other existing crates. For example, this crate provides wrappers for rustfft, allowing a FFT to be performed with a single function call. It also has a STFT/ISTFT function pair. It also has built-in window generation in the style of numpy. And there are implementations of spectral feature extraction, such as calculating spectral centroid, entropy, slope, etc.

Primary Goals

• Abstraction of existing crates (rustfft, symphonia, hound, fft-convolver), allowing their functionality to be used with a simple function call or so.
• FFT functionality designed not just for analysis, but also for FFT modification and resynthesis, including STFT.
• Analysis tools that compute spectral and audio features for analysis and synthesis projects.
• Multithreaded tools for more efficient processing. At present, there is a multithreaded analyzer that allows spectral analysis data to be computed much more quickly for an entire audio file.
• Fast audio feature extraction in Rust, for speeding up Python libraries (e.g. https://github.com/fleximeter/aus-analyzer)

Features

• Audio read/write using symphonia and hound. Reads multiple formats, but only writes to WAV.
• FFT processing courtesy of rustfft. Includes real FFT, inverse real FFT, real STFT, inverse real STFT, spectrum decomposition and recomposition.
• Spectral transformations (scrambling FFT bins and STFT frames, as well as spectral freeze). Includes a convenience wrapper for fft-convolver.
• Granular synthesis tools
• Tuning computation
• Basic audio manipulation (fade in/out, panning)
• Spectral analysis tools:
  • Alpha ratio
  • Hammarberg index
  • Harmonicity
  • Spectral centroid
  • Spectral difference
  • Spectral entropy
  • Spectral flux
  • Spectral flatness
  • Spectral kurtosis
  • Spectral roll-off-points
  • Spectral skewness
  • Spectral slope (including slope of sub-bands)
  • Spectral variance

License

This crate is dual-licensed under the MIT and GPL 3.0 (or any later version) licenses. You can choose between one of them if you use this crate.

SPDX-License-Identifier: MIT OR GPL-3.0-or-later