[linux-audio-user] Re: asoundrc and aplay
arnold.krille at gmail.com
Thu Feb 16 16:14:57 EST 2006
2006/2/16, conrad berhörster <conrad.berhoerster at gmx.de>:
> well, i have 2 soundcards and want to capture from both at the same time
> jack. i don't need sample sync (or such bad things ;=) ) only need the
> signal, each channel individual but into one app, i have written.
Two explain Pauls Jedi-magic:
If you use jack, you want sample-sync. If you don't want sample-sync
and just want to record two independent streams into your software
(assuming you don't want to use it for music[*]) you just have to open
both sounddevices the alsa way and process according to the
[*] If you want to do music with it, you want sample-sync...
Enough things have been said about way two soundcards without syncing
can't be used as one multichannel device, so I won't repeat it here.
I just want to add another trick I learned from my hardware-dealer who
syncs ISDN-cards: Maybe its not enough to just couple their clocks,
they also change the driver to mask the IRQ's from the slave cards and
just react on the master-IRQ and then the driver automaticly
proccesses the data on all cards.
Speaking in the audio-speach of el-cheapo-multichannel: It's not
enough to solder the crystals together, there may be a need to modifiy
the driver. Of course this would make a new soundcard out of it which
exposes its multi-channels to jack directly through the
alsa-interface, no need for .asoundrc-fiddling...
I haven't tested that but I think if it works for ISDN-cards it should
work with soundcards too.
Wenn man mit Raubkopien Bands wie Brosis oder Britney Spears wirklich
verhindern könnte, würde ich mir noch heute einen Stapel Brenner und
einen Sack Rohlinge kaufen.
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