Maximum number of sound devices

Maximum number of sound devices

[Robert Dunn]

What is the maximum number of capture devices ALSA supports?

I have spent the last hour or so, googing for an answer with no success.

The problem I have is a USB audio capture device.  The first eight work
perfrect.  The 9th device on do not create /dev/dspX entries, and it appears
that ALSA is limited to 8 devices.

Thanks for any help in advance.

Robert J. Dunn
robert.j.dunn@gmail.com


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Re: Maximum number of sound devices

[James Courtier-Dutton]

Robert Dunn wrote:
> What is the maximum number of capture devices ALSA supports?
> 
> I have spent the last hour or so, googing for an answer with no success.
> 
> The problem I have is a USB audio capture device.  The first eight work
> perfrect.  The 9th device on do not create /dev/dspX entries, and it appears
> that ALSA is limited to 8 devices.
> 
> Thanks for any help in advance.
> 
> Robert J. Dunn
> robert.j.dunn@gmail.com
> 

The default is 8, but it can be changed with a module option for module 
"snd"
See "modinfo snd"


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Re: Maximum number of sound devices

[Clemens Ladisch]

> Robert Dunn wrote:
> > What is the maximum number of capture devices ALSA supports?

ALSA supports up to 8 sound cards, and up to 8 devices on one sound
card.  (It's possible to increase the latter number by using
subdevices.)

It may be possible to hack the snd-usb-audio driver so that it
pretends that multiple USB devices are one sound card.

James Courtier-Dutton wrote:
> The default is 8, but it can be changed with a module option for module
> "snd"

But it cannot be increased beyond 8 (as long as ALSA uses static
device number allocation for its 8-bit minor numbers).


Regards,
Clemens



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