Mailing List Archive: btaudio analog but no digital

btaudio analog but no digital

Jul 18, 2003, 5:31 PM

Post #1 of 3 (1053 views)

I've loaded btaudio and I have everything working with mythtv (recording and
playback work), except certain channels have really weird sound. They all
sound like they've been run through a really bad synthesizer or something. I
think it's because I'm using btaudio's analog dsp (/dev/dsp3 on my machine).
I've tried using the digital dsp (which it seems a lot of people on the list
use), but nothing comes out of it. In fact, when I just run 'cat /dev/dsp2'
nothing happens, but if I do the samething with dsp3 I get constant output.
I've double-checked, and I definitely have read and write access to both
/dev/dsp2 and /dev/dsp3. Here's btaudio's messages:

btaudio: driver version 0.7 loaded [digital+analog]
PCI: Found IRQ 5 for device 00:0b.1
PCI: Sharing IRQ 5 with 00:0b.0
btaudio: Bt878 (rev 17) at 00:0b.1, irq: 5, latency: 32, mmio: 0xda00600
0
btaudio: using card config "default"
btaudio: registered device dsp2 [digital]
btaudio: registered device dsp3 [analog]
btaudio: registered device mixer1

So can anyone tell me how I can get btaudio to do digital out?
Thanks,
Tom Panning

If you need any information that I haven't provided here, let me know.
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Re: btaudio analog but no digital [ In reply to ]

ijr at po

Jul 18, 2003, 6:08 PM

Post #2 of 3 (1036 views)

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On Friday 18 July 2003 08:31 pm, Tom Panning wrote:
> I've loaded btaudio and I have everything working with mythtv (recording
> and playback work), except certain channels have really weird sound. They
> all sound like they've been run through a really bad synthesizer or
> something. I think it's because I'm using btaudio's analog dsp (/dev/dsp3
> on my machine). I've tried using the digital dsp (which it seems a lot of
> people on the list use), but nothing comes out of it. In fact, when I just
> run 'cat /dev/dsp2' nothing happens, but if I do the samething with dsp3 I
> get constant output. I've double-checked, and I definitely have read and
> write access to both /dev/dsp2 and /dev/dsp3. Here's btaudio's messages:

Make sure you're trying to use the digital dsp at 32khz, stereo.

Isaac
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Re: btaudio analog but no digital [ In reply to ]

tpanning at vt

Jul 18, 2003, 6:38 PM

Post #3 of 3 (1026 views)

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On Friday July 18 2003 9:08 pm, Isaac Richards wrote:
> On Friday 18 July 2003 08:31 pm, Tom Panning wrote:
> > I've loaded btaudio and I have everything working with mythtv (recording
> > and playback work), except certain channels have really weird sound. They
> > all sound like they've been run through a really bad synthesizer or
> > something. I think it's because I'm using btaudio's analog dsp (/dev/dsp3
> > on my machine). I've tried using the digital dsp (which it seems a lot of
> > people on the list use), but nothing comes out of it. In fact, when I
> > just run 'cat /dev/dsp2' nothing happens, but if I do the samething with
> > dsp3 I get constant output. I've double-checked, and I definitely have
> > read and write access to both /dev/dsp2 and /dev/dsp3. Here's btaudio's
> > messages:
>
> Make sure you're trying to use the digital dsp at 32khz, stereo.

I've tried:
$ sox -r 32000 -c 2 -t ossdsp /dev/dsp2 -t ossdsp /dev/dsp
and
$ sox -r 32000 -c 1 -t ossdsp /dev/dsp2 -t ossdsp /dev/dsp
and
$ sox -r 32000 -t ossdsp /dev/dsp2 -t ossdsp /dev/dsp
but nothing happens with any of them (I've also tried all of these on dsp3 to
see if I can use the analog audio, but it doesn't fix the weird sound). Like
I said, the thing that really has me confused is that:
$ cat /dev/dsp2
Just sits there. The device definitely exists (when I try that before loading
btaudio, it says that the device doesn't exist), but there's nothing coming
out of it. I tried writing to dsp2, but that fails with "Device or resource
busy", so it's not some kind of weird input.

Is there any more direct way to see what's supposed to be coming out of dsp2?

Tom
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