On Sat, 6 Mar 2004, Giuliano Pochini wrote:
> On the Echoaudio cards the sample rate is a global setting, so I need a way
> to prevent an app to change the rate if someone else already set it (the
> card han several devices/subdevices). I was thinking to put a simple
> "if (IsAudioOpen()) rate_min=rate_max=current_rate;" in pcm_open callback,
> but this solution is racy.
Yes, but I don't see a better solution for "auto" rate settings.
Also, it would be probably good to create a control which can "fix" the
rate to a value (ICE1712 driver already has this feature).
> Also what am I supposed to do about external clock ? I can't read its
> value and it teoretically can change at any moment.
Yes, I return an error when the rate is other than agreed with
application in the PDAudioCF driver. I think that it's only valid
solution. But if you cannot obtain the rate from hardware, then
it might be problematic.
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs
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