On Tue, 7 Jan 2003, Patrick Shirkey wrote:
> Jaroslav Kysela wrote:
>
> >
> > We use subdevices mainly for hardware which can mix several streams
> > together. It's quite impractical to have 32 devices with exactly same
> > capabilities. The subdevices can be opened without a specific address, so
> > the first free subdevice is opened. Also, we temporary use subdevices for
> > hardware with alot of streams (I/O connectors) - for example MIDI. There
> > are several limits given by used minor numbers (8 PCM devices per card, 8
> > MIDI devices per card etc.).
> >
>
> In the interest of correct documentation how is this explained:
>
> hw:0,0
>
> The first zero is the card number?
> The second zero is the device number?
>
> What happens for sound devices that are not cards? For example the usb
> quattro.
>
> Up until now I have rationalised it as the first zero is the device, the
> second zero is the subdevice and the number of streams that the
> subdevice can do hardware mixing for would become the subsubdevices.
>
> From your message above do I understand we should call every sound
> device a sound card.
Yes, it might be confusing, but subsubdevice is not very good term. A card
is in my eyes a compact hardware unit with several sound related devices.
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs
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