[mythtv-users] Leadtek winfast 2000 XP Can I get sound from bttv directly?
mythtv at zencow.com
Fri Mar 21 21:20:49 UTC 2003
Edward Wildgoose wrote
> Please excuse what may be a dumb question.
> I have a Leadtek winfast 2000 XP TV card and sound works fine using
> the loopback cable out of the back and into the soundcard. However,
> I am hoping to put together the highest quality system possible and
> I have read reports from people with other cards who report better
> quality using the btaudio module to get (what I assume is) sound
> directly from the card.
> Can anyone please confirm that this is what happens, ie with many
> Hauppage cards you can get sound directly from the card without the
> loopback cable, and also that this is a much higher quality solution?
I'm currently using the line-in loop on my soundcard as well, and I
haven't really found any flaw in the quality of the audio, but I also
want to look into the btaudio method for sound on my card, which I think
others have gotten working (I have one of the common WinTV cards).
> Also how would I determine whether I can do that with my card? I
> have taken the card out and there are no obvious chips with the
> correct word, however, is this a good test? "insmod btaudio" works,
> but nothing obvious appears as a result. What should happen if I
> had (say) a hauppage card? Would a /dev/dsp1 device appear? Or is
> it only exposed to the bttv driver which needs to pass it back to
> the OS in some way...?
You should be able to find some info in a log file with the results
of loading the btaudio driver. It should say that it loads and some
kind of card detection. I found the following in my log after I did
a "modprobe btaudio":
hazel:/var/log# grep btaudio kern.log
Mar 21 13:16:50 hazel kernel: btaudio: driver version 0.7 loaded [digital+analog]
Mar 21 13:16:50 hazel kernel: btaudio: Bt878 (rev 17) at 00:0a.1, irq: 9, latency: 64, mmio: 0xdddff000
Mar 21 13:16:50 hazel kernel: btaudio: using card config "default"
Mar 21 13:16:50 hazel kernel: btaudio: registered device dsp2 [digital]
Mar 21 13:16:50 hazel kernel: btaudio: registered device dsp3 [analog]
Mar 21 13:16:50 hazel kernel: btaudio: registered device mixer1
If this much works (which it does for me), it might be a good sign
that you can proceed with trying to choose the right device and get
the settings tweaked until it works for you. I intend to search the
archives for references to "btaudio" to see what others have done.
More information about the mythtv-users