[icecast] FreeBSD - 2 soundcards?

Tim Pozar pozar at lns.com
Mon Mar 11 04:39:00 PST 2002



On Thu, Mar 07, 2002 at 10:18:57AM +0300, Gavin wrote:
> does anyone have experience of running two or more sound cards in a FreeBSD
> machine?  I'm using liveice/icecast to stream radio stations, and I'd like
> to get several in one box.
> 
> I realise a BSD list would be a better place for this, but who else but
> streaming folk would ever think about multiple sound cards?
> 
> After installing a second card, when I makedev snd1, it creates all the
> usual devices but ending in a 1, eg. /dev/dsp1, /dev/audio1.  So I think
> ahah! I now have dsp and dsp1! But these turn out to be links to the first
> devices, eg. /dev/dsp, /dev/audio.
> 
> Has anyone ever managed this?

Yes.  I am running multiple stations streaming (muliple bit rates
too!) and archiving on one box. 

As an example I have one box with three audio cards...

pcm0: <Creative CT5880-C> port 0xdc00-0xdc3f irq 5 at device 9.0 on pci0
pcm1: <Creative CT5880-C> port 0xe000-0xe03f irq 12 at device 10.0 on pci0
pcm2: <Creative CT5880-C> port 0xe400-0xe43f irq 10 at device 11.0 on pci0

Normally you would have to run MAKEDEV to create the devices you
have installed.  Ie...

        #./MAKEDEV snd2

Will create the devices for the third card as numbers start with
zero.  /dev/dsp, /dev/dspW, /dev/mixer, etc. are just sym links to
the default real device names such as:

lrwxrwxrwx  1 root  wheel         6 Nov 24 22:33 audio -> audio0
crw-rw-rw-  1 root  wheel   30,   4 Nov 24 22:33 audio0
crw-rw-rw-  1 root  wheel   30,  20 Nov 24 22:32 audio1
crw-rw-rw-  1 root  wheel   30,  36 Nov 24 22:32 audio2
lrwxrwxrwx  1 root  wheel         4 Nov 24 22:33 dsp -> dsp0
crw-rw-rw-  1 root  wheel   30,   3 Nov 24 22:33 dsp0
crw-rw-rw-  1 root  wheel   30,  19 Nov 24 22:32 dsp1
crw-rw-rw-  1 root  wheel   30,  35 Nov 24 22:32 dsp2
lrwxrwxrwx  1 root  wheel         5 Nov 24 22:33 dspW -> dspW0
crw-rw-rw-  1 root  wheel   30,   5 Nov 24 22:33 dspW0
crw-rw-rw-  1 root  wheel   30,  21 Nov 24 22:32 dspW1
crw-rw-rw-  1 root  wheel   30,  37 Nov 24 22:32 dspW2
lrwxrwxrwx  1 root  wheel         6 Nov 24 22:33 mixer -> mixer0
crw-rw-rw-  1 root  wheel   30,   0 Nov 24 22:33 mixer0
crw-rw-rw-  1 root  wheel   30,  16 Nov 24 22:32 mixer1
crw-rw-rw-  1 root  wheel   30,  32 Nov 24 22:32 mixer2
[etc.]

I use my own perl script for live streaming encoder (mixice) instead
of darkice. In the script I just point at the real device name (ie.
/dev/dsp1) in the script.  I imagine that you would do the same for
darkice and liveice.

Tim

-- 
  Snail: Tim Pozar / LNS / 1978 45th Ave / San Francisco CA 94116 / USA
               POTS: +1 415 665 3790  Radio: KC6GNJ / KAE6247
"It's a damn poor mind that can only think of one way to spell a word."
                        - Andrew Jackson
"What is wanted is not the will to believe, but the will to find out,
which is the exact opposite." - Bertrand Russell, "Skeptical_Essays"

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