Mp3 decoding with the MAD library: We've all been doing it wrong – The Breakfast Post
Help with Squeezelite and MP3s / Spotify | Digital Sources, DACs, and Computer Audio
GitHub - sezero/libmad: libmad - MPEG audio decoder library (fork generated from official releases)
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GitHub - anaelorlinski/libsox: Libsox extracted from SoX, with custom changes for new imput formats : mp3 input using libmpg123, m4a input with libmp4v2+fdk-aac