SELA
A simple, open-source lossless audio codec with good compression ratios, written in C++.
What is SELA?
SELA (SimplE Lossless Audio) is an open-source lossless audio codec that compresses audio files without any quality loss. It uses linear prediction and Golomb-Rice coding to achieve good compression ratios while keeping the implementation simple and understandable. The project provides both encoding and decoding capabilities along with a built-in player for direct audio playback.
Audio software developers, embedded systems engineers, and anyone interested in learning about or implementing lossless audio compression algorithms.
Developers choose SELA for its simplicity, clean C++ codebase, and educational value compared to more complex alternatives like FLAC. It offers a fully functional lossless codec with multithreading support and minimal dependencies.
Overview
SimplE Lossless Audio
Use Cases
Best For
- Learning how lossless audio compression algorithms work
- Embedded systems requiring simple audio compression
- Educational projects about signal processing and codec design
- Applications needing a lightweight alternative to FLAC or ALAC
- Cross-platform audio tools with minimal dependencies
- Projects prioritizing code simplicity over maximum compression ratios
Not Ideal For
- Professional audio production needing 24-bit depth support
- Applications requiring metadata tags (like ID3) for audio organization
- Systems where seek tables are essential for random access in large audio files
- Projects demanding the highest possible compression ratios over code simplicity
Pros & Cons
Pros
The codebase prioritizes simplicity and clarity, with clear block diagrams and references, making it ideal for learning lossless audio compression techniques.
Includes a built-in player for direct SELA audio playback, reducing the need for external tools during development or testing.
Works on Linux, BSD, and Windows with minimal dependencies, as confirmed by the build requirements and Travis CI integration.
Leverages parallel processing for encoding and decoding, which can improve speed on multi-core systems, as listed in the key features.
Cons
The status table shows TODO items like metadata support, seek tables, and 24-bit audio, limiting its utility for professional or full-featured applications.
Requires cmake and external libraries (e.g., libao-dev on Linux/BSD), adding complexity compared to drop-in solutions or more mature codecs.
As a niche project, it lacks the wide tool support and community adoption of established formats like FLAC, which can affect integration and long-term maintenance.
Open Source Alternative To
SELA is an open-source alternative to the following products:
ALAC (Apple Lossless Audio Codec) is an audio coding format developed by Apple for lossless compression of digital music without sacrificing audio quality.
FLAC (Free Lossless Audio Codec) is an open-source audio coding format for lossless compression of digital audio, preserving original sound quality while reducing file size.
Frequently Asked Questions
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