On Sun, 29 Feb 2004, Ann Patterson wrote:
> I installed a M-Audio Revolution 7.1 (snd-ice1724) in my mythtv box. I
> had mythtv working fine with the machine's onboard sound (snd-trident)
> using OSS emulation. The revo works correctly for things like xine,
> mplayer, aplay (of course), play, etc. In mythtv, however, I get no
> sound.
>
> I dug into the mythtv code, and found that it is doing a call to
> ioctl(audiofd, SNDCTL_DSP_GETOSPACE, &info) and using the info.bytes
> value that is returned to determine whether or not to write to the card.
> The first call to SNDCTL_DSP_GETOSPACE appears to return a reasonable
> number, but from that point, the numbers returned are all over the
> place, and are often negative. So, mythtv, of course, won't write to the
> card. I find that if I comment out the code that checks the values
> returned from GETOSPACE, I get sound, but it is out of sync with the
> video (sound slightly behind video).
>
> I'm using the dmix plugin, if that matters, but I got the same results
> without the plugin.
>
> I'm willing to debug this further, but I've not done anything with alsa
> or soundcards before, so I need a bit of help in determining where to
> look.
Can you write a nice small test code which shows this problem? You may
modify code in alsa-oss/test/osstest.c .
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs
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