libgsm ☆

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Description:
Lossy speech compression library

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: Multimedia

Tags: audio compression library gsm multimedia

Install: brew install libgsm

About:
Libgsm is an open-source library implementing the ETSI GSM 06.10 provisional speech standard. It provides a fast and portable reference implementation for lossy speech compression, enabling developers to encode and decode audio streams efficiently. Its main value is offering a compact, standalone C library for integrating mobile speech compression into various applications.

Key Features:

Reference implementation of the GSM 06.10 standard
Portable ANSI-C source code
Fast encoding and decoding performance
Command-line tools for audio conversion

Use Cases:

Compressing audio for voice-over-IP (VoIP) applications
Transcoding audio files to the GSM format for storage
Integrating speech compression into embedded systems

Alternatives:

Opus – Opus is a more modern, versatile codec offering higher quality at lower bitrates, but GSM remains a standard for legacy cellular systems.
Speex – Speex is an older open-source codec designed for voice, offering variable bitrates, whereas GSM is a fixed-rate standard.

Version History

Detected	Version	Rev	Change	Commit
Sep 14, 2025 3:03am		0	VERSION_BUMP	7b42650b
Feb 2, 2023 3:05am		0	VERSION_BUMP	c50caec5