On Sun, 2006-09-24 at 18:41 +0200, [EMAIL PROTECTED] wrote:
> Thanks Markus and all for the replies.
>
> My problem is that STK does not seem able to see the alsa plugins.
>
> In other words, when one uses -say- aplay it is possible to specify what
> device or plugin to use with the -D option, for example:
> -D plug:duplex
> as you suggest in the example.
>
> In the STK api for alsa I can only select one of the audio cards, in my case
> I see the following 4:
>
> hw:I82801CAICH3,0
> hw:I82801CAICH3,1
> hw:U0x4710x311,0
> hw:Audio,0
>
> The first two seem to be related to the built-in laptop sound card (intel
> chip based) (why 2 entries???)
Probably analog and SPDIF.
> , the third one is probably the mic input of the webcam and the last one is
> my terratec.
> I can only select one of these by number (i.e. I can select 1, 2, 3 or 4)
>
This is an incorrect use of the ALSA API by STK (It doesn't help that
ALSA has no good device enumeration API). It should allow you to choose
plughw:* devices, but it only lists hw:* devices. This means that only
sample rates supported by the hardware can be chosen.
> If I try to open the last one at 44.1kHz I get:
> RtApi: unable to open specified device(s) with given stream parameters:
> RtApiAlsa: error setting sample rate (44100) on device (hw:Audio,0):
> Invalid argument.
>
> If I open it at 48kHz it is fine.
>
> In general, from the discussion I understand that the best (but probably long
> term for me) solution is to change my code to work at 48kHz, but for now it's
> really important to get the old code to work.
>
You just need to patch STK to allow plughw devices to be used, or give
up and run at 48Khz. There's no other solution.
> Does this make any sense?
> Any suggestions?
>
> Thanks,
> Enrico
>
> ---------- Initial Header -----------
>
> >From : "Markus Rechberger" [EMAIL PROTECTED]
> To : "[EMAIL PROTECTED]" [EMAIL PROTECTED]
> Cc : "alsa-user" alsa-user@lists.sourceforge.net,"alsa-devel"
> alsa-devel@lists.sourceforge.net
> Date : Sun, 24 Sep 2006 16:32:23 +0200
> Subject : Re: [Alsa-devel] USB card @48kHz only: at what layer to resample?
>
>
>
>
>
>
>
> > Hi,
> >
> > you could use the alsa rate plugin.
> >
> > I used following .asoundrc for testing my driver:
> >
> > pcm.au600playback {
> > type dmix
> > ipc_key 1024
> > ipc_perm 0777
> > slave {
> > pcm "hw:2,0"
> > period_time 0
> > period_size 96
> > buffer_size 1920
> > format S16_LE
> > periods 4
> > rate 9600
> > }
> > }
> >
> > pcm.au600capture {
> > type rate
> > slave {
> > pcm "hw:2,1"
> > format S16_LE
> > rate 9600
> > }
> > }
> > pcm.duplex {
> > type asym
> > playback.pcm "au600playback"
> > capture.pcm "au600capture"
> > }
> >
> > aplay -D plug:duplex <filename>
> >
> > cheers,
> > Markus
> >
> > On 9/24/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> > > Dear All,
> > >
> > > Apologies in advance if I am asking a stupid question, I am quite new with
> > > alsa. I posting to both lists because I am not sure about handling this
> > > issue at the application development level or at the alsa driver
> > > configuration level.
> > >
> > > I am developing an audio application using the CCRMA synthesis tool-kit
> > > (STK) in Fedora Core4 using alsa. I recently bought a Terratec Aureon 5.1
> > > USB MKII card, because I needed to have better sound quality than what
> > > offered by my laptop.
> > >
> > > My understanding is that the usb card only works at 48kHz -- is this
> > > correct?
> > > I manage to get aplay to work using the following plugin in
> > > /etc/asound.conf
> > > pcm.!default {
> > > type plug
> > > slave {
> > > pcm "hw:2,0"
> > > rate 48000
> > > }
> > > }
> > >
> > > However, in SKT I can enumerate the audio cards on my machine, but this
> > > does
> > > not give me alsa plugins, only the audio cards. If I try to open the
> > > Aureon
> > > at 44.1kHz, I get an error saying rate not supported.
> > >
> > > Is there any way to have alsa handle the rate conversion for me?
> > > Shouldn't
> > > or couldn't the driver take care of this? (Was it my mistake in
> > > installing
> > > the driver? I can post my /etc/modprobe.conf if it helps)
> > > Or is there any way to get STK to see the plugin?
> > >
> > > Thank you in advance,
> > > Enrico
> > >
> > >
> > >
> > >
> > >
> > > -------------------------------------------------------------------------
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> >
> >
> > --
> > Markus Rechberger
> >
>
>
>
>
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