RE: Several capture devices in parallel

Hello Dan, thank you for your reply;


From: [email protected]
[mailto:[email protected]] 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"                                              
             <Christian.Haas@f                                             
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                                       [Openal] Several capture devices in 
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             01/22/2010 09:05                                              
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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


____________________________________________________
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