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redsea is an FM-RDS decoder for Linux / macOS that outputs newline-delimited JSON (ndjson).

RDS is what enables your car radio to display the station name and the song playing.

The idea of redsea is to be something of a logger or a converter. The main problem is: how to take data of real-time nature and meaningfully print it as self-sufficient log entries?

This wiki contains information that goes past the readme, namely:

• Installation
• Building on a low-end system
• Command line options
• Input formats
• Supported RDS features (and JSON format description)
• Use cases

And some discussion on Redsea internals:

• Benchmark results
• RDS clock recovery from pilot tone?
• Time and timestamps
• Some RadioText research
• Error detection and correction