More than 8 soundcards

More than 8 soundcards

[Riccardo Tempesta]

I'm trying to use more than 8 soundcards with ALSA.

I've seen the following line in "driver.h"
#define SNDRV_CARDS 8 /* number of supported soundcards - don't change - 
minor numbers */

What does "don't change - minor numbers" mean?

I tried to increase it to 16 and I can see new /proc/asound/cardX 
folders, but no /dev/dspX devices.

Any help will be appreciated.
Thank you in advantage.

Riccardo.


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Re: More than 8 soundcards

[Lee Revell]

On Thu, 2006-04-06 at 21:31 +0200, Riccardo Tempesta wrote:
> I'm trying to use more than 8 soundcards with ALSA.
> 
> I've seen the following line in "driver.h"
> #define SNDRV_CARDS 8 /* number of supported soundcards - don't change - 
> minor numbers */
> 
> What does "don't change - minor numbers" mean?
> 
> I tried to increase it to 16 and I can see new /proc/asound/cardX 
> folders, but no /dev/dspX devices.
> 

Hence the "don't change" comment.  If it was that easy, this would
already be set to 16.

> Any help will be appreciated.
> Thank you in advantage.

I belive you just need to enable CONFIG_SND_DYNAMIC_MINORS to eliminate
the 8 device limit (check list archives to be sure)

Lee




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Re: More than 8 soundcards

[Clemens Ladisch]

Riccardo Tempesta wrote:
> I'm trying to use more than 8 soundcards with ALSA.
> 
> I've seen the following line in "driver.h"
> #define SNDRV_CARDS 8 /* number of supported soundcards - don't change - minor numbers */
> 
> What does "don't change - minor numbers" mean?

That ALSA allocates 32 minor numbers per card, and due to the limit of
256 minor numbers it is not possible to have more than 8 cards.

Since 1.0.11rc1, driver.h has the following code:

/* number of supported soundcards */
#ifdef CONFIG_SND_DYNAMIC_MINORS
#define SNDRV_CARDS 32
#else
#define SNDRV_CARDS 8		/* don't change - minor numbers */
#endif

If you don't use the in-kernel ALSA, add the --enable-dynamic-minors
option to the configure call.


HTH
Clemens


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