MP3 Playback with CircuitPython #Feather #AdafruitLearningSystem @Adafruit

A LCD display shows a winamp-like user interface for MP3 playback

Compressed audio can be a nice alternative to uncompressed WAV files, especially when you have a small filesystem like that on many CircuitPython boards, as WAV files get sizeable quite quickly.

MP3 technology dates to the 1990s and all the patents have long since expired worldwide, making it an obvious choice for compressed audio. For this reason, many builds of CircuitPython include the audiomp3 module with its MP3Decoder object.

You can listen to a much longer playlist with CircuitPython, using the built in MP3 playback capability!

The MP3 decoder itself supports a wide range of formats, including CBR, ABR and VBR. Across most boards that support MP3Decoder, we’ve found that mono and stereo files from 32kbit/s to 128kbit/s work, with sample rates from 16kHz to 44.1kHz.

More powerful boards can even decode and mix two MP3s and some Espressif boards can stream MP3s from a web server.

The guide explains how to use CircuitPython boards for MP3 playback, detailing the support for various formats and capabilities like mixing two MP3s or streaming from a web server. It also provides tips and advice on constructing audio playback objects, MP3Decoder objects, and managing buffers for optimal performance.

Read more at MP3 Playback with CircuitPython


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