Subject: [linux-audio-dev] strange issue with libsndfile
From: martin rumori (lists_AT_rumori.de)
Date: Sat May 15 2004 - 15:08:59 EEST
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
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