The main author of libsndfile is Erik de Castro Lopo apart from code in the following directories: - src/GSM610 : Written by Jutta Degener and Carsten Bormann . They should not be contacted in relation to libsndfile or the GSM 6.10 code that is part of libsndfile. Their original code can be found at: http://kbs.cs.tu-berlin.de/~jutta/toast.html - src/G72x : Released by Sun Microsystems, Inc. to the public domain. Minor modifications were required to integrate these files into libsndfile. The changes are listed in src/G72x/ChangeLog.