Subject: [linux-audio-dev] libsndfile: type combinations and string data
From: martin rumori (lists_AT_rumori.de)
Date: Mon Aug 30 2004 - 22:58:32 EEST
hi erik,
i've got a question regarding type combinations in libsndfile:
SF_FORMAT_FLOAT | SF_ENDIAN_CPU works with SF_FORMAT_AU on any
platform, which is great. but it doesn't work with neither aiff nor
wav. i expected that it would work with one of the both formats,
depending on the host endianess.
is there a special reason why it does not?
some other questions regarding string data:
snd does not explicitly allow using string data in the file format.
however, i remember that it was done in the old NeXT days by
increasing the data offset and using the space in between for a
comment. do you think this could be implemented in libsndfile for the
SF_STR_COMMENT thing or is that just too non-standard?
with SF_FORMAT_AIFF, i can't write string data to the file in SFM_RDWR
mode. the call to sf_set_string() succeeds, but the actual data in
the file is not changed. the call to sf_set_string() succeeds even
when the file is in SFM_READ mode.
with SF_FORMAT_WAV, a file with string data can't be opened with
SFM_RDWR anymore. this means there is no way to change the audio data
or the comment of the file without copying it? i guess there is a
special reason for that...
thanks very much for your patience...
bests,
martin
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