[linux-audio-dev] strange issue with libsndfile

hi *, i've got a strange issue with libsndfile. in foo (http://foo.sf.net) the SFM_RDWR mode is used, because target soundfiles are created independently of the write process before, then the file gets opened with SFM_RDWR to determine the target soundfile's parameters (samplerate, channels...). with SF_FORMAT_AIFF | SF_FORMAT_FLOAT (and SF_FORMAT_DOUBLE, btw., 2 channels) i notice a strange behavior: directly after creating the file (without sf_writing anything) the number of frames of the file is 4 (SF_FORMAT_DOUBLE: 2 frames). this doesn't happen neither with the SF_FORMAT_PCM_* things, nor with SF_FORMAT_WAV. with just 1 channel the values are 6 resp. 3. when reopening the file for writing (SFM_RDWR mode), there is no difference between seeking to (0, SEEK_SET) and (0, SEEK_END), both seek to 0. surprisingly, seeking to (4, SEEK_SET) doesn't return an error. after writing 512 frames after seeking (in all three cases) and having closed the file, the number of frames is now 511 (1022 with 1 channel). am i missing something, or is this a bug in libsndfile? attached my test prog. bests, martin