Re: [Jack-Devel] ALSA PCM substreams

On 12/03/2013 07:37 AM, Clemens Ladisch wrote:
> Gabriel M. Beddingfield wrote:
>> When opening a PCM, would it make sense for JACK to open all the
>> substreams on that PCM?
>
> No.  PCM devices with multiple substreams typically use them for
> hardware mixing.  (When opening a device without an explicitly
> specified substream number, ALSA chooses the first free substream.)

Any idea where the whole `substream' concept is documented?  I'm still 
fuzzy on what it's intended to solve.

Even if it's hardware mixing, I think it still makes sense for JACK to 
open them.

>> I spoke with the developers of the `caiaq' driver, and they said it
>> would make sense for JACK to go ahead and open all the substreams.
>
> Only for this particular device.
>
> A useful feature would be the ability to specify multiple device names,
> and Jack automatically constructing a "multi" device for them.

Not a bad idea.  I'll look in to this.

-gabe

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