14 Nov
2008
14 Nov
'08
9:47 a.m.
Paul Davis wrote:
On Fri, 2008-11-14 at 01:08 +0100, Fons Adriaensen
wrote:
Old OSS/Free may have this kind of ioctl
calls. However OSS 4.x has
similar control API than ALSA.
MADI clock source is one of the "big red button" controls in OSS. They
are supposed to be touched only when the whole studio wiring changes.
This is to be done in the control panel by the system administrator.
There is no point in letting any application to change such settings so
it has intentionally been made pretty much impossible.
Best regards,
Hannu
Now if someone can point me to some existing docs
that
explain how I can e.g. set the sample clock source on a
RME MADI card in less than ten lines of C code (knowing
the parameter names, ranges, etc - no need to find them
out dynamically, I can read them asound.state) then I'll
eat my hat. It shouldn't be difficult. On some competing
systems all it takes is one ioctl().
i don't want to defend the lamentable state of the ALSA docs, but this
last shot was a bit cheap Fons. the idea behind the ALSA control API was
that equivalent controls on different cards would be controlled in the
same way. sure, OSS provides ioctl (fd,
OSS_THIS_ONE_DOES_MADI_CLOCK_SOURCE, &int) but move that code to any
other device and it breaks entirely.