Re: Several capture devices in parallel

Hi Christian,

The wrap_oal.dll component only supports one capture device at a time.
Subsequent calls to alcCaptureOpenDevice should be returning NULL (are you
checking for this?)

You are right that there is no need for a context when using a capture
device.

Dan
Creative Labs (UK) Ltd.

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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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