I have a little progress. I could reproduce the problem with
memory mapped stereo sound using a SoundBlaster-16 card. Channels
are not reversed with my 82C931 based card, or when I use normal
write() system call (ie, using vplay -S). I do not have access to
other sound cards.
To proceed I need the SB 16 programming specs. Im just downloading
http://www.creativelabs.com/creative/devinfo/ctsbhwpg.exe (the faq
sais it's not OS specific. Why is it an exe file?) with hope that
it contains it all.
Linux 2.1.90 introduced a new problem WRT mmapped audio output. It
produces clicks (estimated on every 4KB = frag size) where output was
smooth in 2.1.89. I suspect some changes in dmabuf.c are responsible
for that.
Itai
--
Itai Nahshon nahshon@actcom.co.il
Also nahshon@vnet.ibm.com
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