[Openal] Several capture devices in parallel
Daniel PEACOCK
dpeacock at creativelabs.com
Fri Jan 22 05:52:12 PST 2010
Hi Christian,
There are currently no plans to update wrap_oal.dll to support multiple
capture devices. OpenAL-Soft could be an option though.
Dan
Creative Labs (UK) Ltd.
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"HAAS Christian"
<Christian.Haas at f
requentis.com> To
Sent by: <openal at opensource.creative.com>
openal-bounces at op cc
ensource.creative
.com Subject
RE: [Openal] Several capture
devices in parallel
01/22/2010 10:26
AM
Hello Dan, thank you for your reply;
From: openal-bounces at opensource.creative.com
[mailto:openal-bounces at opensource.creative.com] On Behalf Of Daniel PEACOCK
> The wrap_oal.dll component only supports one capture device at a time.
Hm, thats bad for me; Seems like I'll have to use an OS specific API
then...
Is support for multiple capture devices in parallel planned, or generally
not
to be expected (in the near future)?
> Subsequent calls to alcCaptureOpenDevice should be returning NULL (are
you
checking for this?)
Yes, I am checking, always a valid pointer; For a test I let my application
trace the pointer value - for my 4 different device names I received the
identical pointer value!
Which at least explains why the four threads were accessing the samples of
the first one subsequently...
The reported names of the capture devices are
AES (1+2) (RME HDSPe AIO)
ADAT (5+6) (RME HDSPe AIO)
ADAT (3+4) (RME HDSPe AIO)
ADAT (1+2) (RME HDSPe AIO)
Analog (1+2) (RME HDSPe AIO)
SPDIF (RME HDSPe AIO)
ADAT (7+8) (RME HDSPe AIO)
I was using all the ADAT ones; For cross checking I also tried the AES
device
next to the ADAT (1+2) and I received the same pointer as well.
Should I also check for an identical return value, or should this not
happen?
Either way, without several devices working I wont be able to use OpenAL...
Kind regards,
ch
"HAAS Christian"
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requentis.com> To
Sent by: <openal at opensource.creative.com>
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ensource.creative
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[Openal] Several capture devices in
parallel
01/22/2010 09:05
AM
Hello!
I want to run an application that captures samples from several devices in
parallel.
The specification says that capturing runs beyond the concept of (playback)
contexts and it appears that capturing has no concept of context at all;
Although I can open several capture devices in parallel, any further
capture
function only returns results from the first device opened – the device
parameter appears to be ignored. It so happened that for example my second
device provided audio available only on the first one.
alcCreateContext() returns NULL for those devices, so the only 'context'
available is the device, which is ignored.
The devices are accessed in dedicated threads each – sample capture is
currently separated by a mutex, as the results were even weirder without
(one
thread snatched the samples from the first, while the first expected them
and
so forth)
Is it meant to be possible to have several capture devices running? If so,
what am I missing?
System:
OS: Windows 2008 Server 64bit
Interface: RME AIO, newest WDM Driver (3.08.2)
OpenAL: OpenAL32.dll Ver.6.14.357.24, wrap_oal.dll Ver.2.2.0.5
(I'm trying to capture the 4 pairs of ADAT channels, which are stereo
capture
devices each)
Thanks,
ch
____________________________________________________
Christian Haas
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