At Mon, 10 Nov 2008 08:20:13 +0100,
chri wrote:
>
> Hi,
>
> On Mon, Nov 10, 2008 at 7:50 AM, Takashi Iwai <tiwai@xxxxxxx> wrote:
> > At Sat, 8 Nov 2008 08:44:16 +0100,
> >
> > I don't think it's good to overwrite the global variables in this way.
> >
>
> I see. I just tried to keep the modifications minimal. Perhaps Ben
> Dooks, the author of the code, can suggest a better way to proceed. I
> will be happy to follow his suggestion.
OK.
> > And, what if playback and capture use the different formats in full
> > duplex streams...?
> >
>
> I dont' think that this is possible on the S3C24{1,4}0 since the
> configuration registers are shared between playback and record path
> (so this applies to sample frequency too for example). I guess you are
> suggesting that given parameters should be checked against those of
> the currently playing stream to see if they are compatible?
Yes. Without a proper check and/or hw_param constraints, the driver
thinks the streams are individual and allows apps to set up
independent parameters, which may result in a hardware error.
Creating hw constraints sharing both playback and capture streams is a
bit tricky and even racy. But, it'd be much better than nothing.
thanks,
Takashi
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