This really depends on the driver, I would think. Some drivers are setup for single input at a time, as the most common usage model is for voice conferencing. But i can see where this would be useful from a recording studio perspective. The trick would be to have the recording program enable the correct capture pathways, which can be driver independent. It also can be a hardware limitation, like with some sound chips on the HDA-Intel bus. Some of them may have multiple paths for input through pin reassignment, but only 1-2 ADC's. for actual capture.
If you let us know exactly what hardware you have, the developer(s) for that system may be able to better answer.
Tobin
On Mon, 2007-12-10 at 17:20 +0100, Christophe Osuna wrote:
Hi,
I would like to capture sound from the Line and Mic inputs simultaneously. The sound chip seems capable to do so: inside alsamixer, in the "Capture" tab I can select up to three subdevices, and from the "Playback" tab I can set the input source one to "Mic" and the input source two to "Line" (and three to whatever).
When trying to use several output ports at the same time I use four, six or eight channels. I tried the same thing for input (i.e. use four channels) but that failed. I guess I have to use subdevices but I have no idea on how to start working with them.
Could anyone:
- tell me if ALSA is limited to two capture channels, and in that
case what should be done;
- point me to some documentation showing what to do, or give me some
general hints
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