Re: [gentoo-user] (SOLVED) Usb sound and ALSA

[Leandro Melo de Sales]

Hi...
  just to document. There are two options:

1) I created ~/.asoundrc file (as suggested by Richard) but with some
modification as shown next (I don't know if all this option is
necessary, but the sound is perfect):

----- ~/.asoundrc

pcm.card0 {
        type hw
        card 1
}

pcm.!default {
        type plug
        slave.pcm "dmixer"
}

pcm.!output {
        type dmix
        ipc_key 1024
        ipc_key_add_uid 1
        slave {
            pcm "card0"
            period_time 0
            period_size 1024
            buffer_size 8192
            rate 192000
        }
        bindings {
            0 0
            1 1
        }
}

pcm.!input {
        type dsnoop
        ipc_key 28889
        ipc_key_add_uid 1
        slave {
                pcm "card0"
                channels 2
                period_time 0
                period_size 1024
                rate 192000
        }

pcm.!duplex {
        type asym
        playback.pcm "output"
        capture.pcm "input"
}

pcm.!default {
        type plug
        slave.pcm "duplex"
}

pcm.dsp0 {
        type plug
        slave.pcm "duplex"
}

ctl.mixer0 {
        type hw
        card 0
}

pcm.jackplug {
        type plug
        slave { pcm "jack" }
}

pcm.jack {
        type jack
        playback_ports {
               0 alsa_pcm:playback_1
               1 alsa_pcm:playback_2
        }
        capture_ports {
               0 alsa_pcm:capture_1
               1 alsa_pcm:capture_2
        }
}

2) change alsa configuration module to put my card1 to card0 and card0
to card1 (don't forget to restart alsa daemon):

------ /etc/modules.d/alsa
alias /dev/mixer snd-mixer-oss
alias /dev/dsp snd-pcm-oss
alias /dev/midi snd-seq-oss

alias snd-card-0 snd-usb-audio
alias sound-slot-0 snd-usb-audio
alias snd-card-1 snd-intel8x0
alias sound-slot-1 snd-intel8x0
options snd-usb-audio index=0
options snd-intel8x0 index=1
------------------------------------

... snd-intel8x0 is the module alias for my internal sound card and
snd-usb-audio for my external usb audio device.

BTW, thanks Richard.

[]s
Leandro.

-- 
Leandro Melo de Sales.
Computer Science MSc Candidate
Distributed System Lab - lsd.ufcg.edu.br
Pervasive Computing Lab - embedded.ufcg.edu.br
Federal University of Campina Grande - UFCG
083 33101404 (extension 208)

2006/10/31, Leandro Melo de Sales <leandroal@×××××.com>:
> Hi,
>
>  After I click on Apply button the Alsa Device Configuration section
> become enabled, but when I specify hw1,0 in Stereo text field and play
> a song amarok shows the message: "Audio output unavailable; the device
> is busy.".
>
> /proc/asound/ # ls
> ASM5X0  Modem  card1  cards    hwdep    oss  seq     version
> ICH6    card0  card2  devices  modules  pcm  timers
>
> the file ASM5X0 is a symbolic link to card2.
>
> /proc/asound/ # cat cards
>  0 [ICH6           ]: ICH4 - Intel ICH6
>                       Intel ICH6 with unknown codec at 0xc8000800, irq 18
>  1 [Modem          ]: ICH-MODEM - Intel ICH6 Modem
>                       Intel ICH6 Modem at 0x3400, irq 18
>  2 [ASM5X0         ]: USB-Audio - AS-M5X0
>                       Gradiente AS-M5X0 at usb-0000:00:1d.1-1, full speed
>
> I also tried to specify hw2,0 but the message is the same, device is busy! :(
>
> But a good news is that if I do:
>
> mpg123 -a /dev/sound/dsp1 music.mp3
>
> ... the file is played on my usb device perfectly!!! So, this is the
> proof that kernel recognize the device and I just don't know how
> switch alsa default device do /dev/sound/dsp1.
>
> Any clue? Thank you,
>
> Leandro.
>
> 2006/10/31, Leandro Melo de Sales <leandroal@×××××.com>:
> > Hi... The device is configured and I type cat xxx > /dev/sound/dsp1
> > and I got an strange sound, but this prove that the device was
> > recognized by the kernel. I also can control volume of the second
> > audio device through alsamixer. The question is: how can I specify (on
> > alsa) that the default device is /dev/sound/dsp1 or something like
> > that?
> >    I tried to do what you said on Amarok, but the "Alsa Device
> > Configuration" section is disabled, why?
> >
> > []s
> > Leandro.
> >
> > 2006/10/31, Richard Fish <bigfish@××××××××××.org>:
> > > On 10/30/06, Leandro Melo de Sales <leandroal@×××××.com> wrote:
> > > > Hi list...
> > > >
> > > >    I have an usb sound system from Gradiente company (an eletronic
> > > > device factory) and I plugged it on my system. dmesg command shows
> > > > this:
> > > >
> > > >     input: Gradiente AS-M5X0 as /class/input/input3
> > > >     input: USB HID v1.00 Device [Gradiente AS-M5X0] on usb-0000:00:1d.1-1
> > > >
> > > >    But when I play a mp3 media the sound is not forwarded to my usb
> > > > device, instand, the sound is still played through my integrated
> > > > laptop device.
> > > >    On windows I use it without problem. So, what do I have to do to
> > > > forward the sound to my usb device?
> > >
> > > Probably windows is disabling any existing sound card or at least
> > > making the USB the "default" sound device.  Unfortunately there is no
> > > equivalent with alsa currently.
> > >
> > > So assuming that you've got the alsa drivers loaded for this device
> > > (/proc/asound/cards should contain two entries), you can usually
> > > specify alsa device as "hw1,0".  The exact method for doing this
> > > depends on what app you are using.  For example on amarok with the
> > > xine it is under Configure Amarok... -> Engine -> ALSA Device
> > > Configuration.  If you enter hw1,0 for Stereo there, then 2 channel
> > > audio should be played on the first pcm of the second sound card.
> > >
> > > You should also be able to do this with a .asoundrc file, with an entry like:
> > >
> > > pcm.default {
> > >         type hw
> > >         card 1
> > >         device 1
> > > }
> > >
> > > The above is really primitive, without any dmix plugin (software
> > > mixing), so only one app could use the device at a time unless it does
> > > hardware mixing.  Mostly this is just to give you an idea of where to
> > > look! ;-)
> > >
> > > -Richard
> > > --
> > > gentoo-user@g.o mailing list
> > >
> > >
>
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