Before even attempting to report a bug in libsndfile please make sure you have read the Frequently Asked Questions. If you are having a problem writing code using libsndfile make sure you read the Application Programming Interface documentation.
That said, I am interested in finding and fixing all genuine bugs in libsndfile. Bugs I want to fix include any of the following problems (and probably others) :
When submitting a bug report you must include :
If libsndfile compiles and installs correctly but has difficulty reading a particular file or type of file you should run the sndfile-info program (from the examples directory of the libsndfile distribution) on the file. See here for an example of the use of the sndfile-info program.
Please do not send me a sound file which fails to open under libsndfile unless I specifically ask you to. The above information should usually suffice for most problems.
Once you have the above information you should email it to one of the mailing lists (posting to these lists is limited to the list subscribers).