Re: The ALSA Situation

[Takashi Iwai <tiwai@suse.de>]

At Wed, 10 Nov 2004 22:42:20 -0800 (PST),
Linus Torvalds wrote:
> 
> On Thu, 11 Nov 2004, Jaroslav Kysela wrote:
> > 
> > Unfortunately, the application will have to settle other real-time
> > parameters (including stream parameters, i/o chunk sizes etc.), so we must
> > drain on close() the complete stream and not allow intermixing requests
> > from applications.
> 
> That seems to be a misdesign of the interfaces, but whatever.

Well, the contiguous use of a stream isn't easy as it sounds.
Since each app wants different buffer size, period (fragment) size,
sample format, sample rate etc, the configuration must be reset
totally at each time.  This eventually requires to stop of the DMA.

It's possible to check the condition and contine if it's identical
with the previous one, though.  But I feel it's overdesigned as the
driver.  A practical way to avoid popping would be the damping as
Fernando suggested (if h/w doesn't support soft-muting).


Takashi


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