dmix vs. other plugins

dmix vs. other plugins

[Brad Midgley]

Hi

Is it true that dmix can't be used to mix down to a slave that is itself 
an alsa-lib plugin?

I was excited to read about dmix and imagined using it to give multiple 
access to the stereo bluetooth alsa-lib plugin in development.

If dmix to alsa-lib-slave isn't working now, would it be a 
straightforward change for me to work on?

thanks
Brad


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Re: dmix vs. other plugins

[Takashi Iwai]

At Sun, 25 Sep 2005 23:52:03 -0600,
Brad Midgley wrote:
> 
> Hi
> 
> Is it true that dmix can't be used to mix down to a slave that is itself 
> an alsa-lib plugin?
> 
> I was excited to read about dmix and imagined using it to give multiple 
> access to the stereo bluetooth alsa-lib plugin in development.

Yes, that's a known problem.
dmix/dsnoop/dshare are plugins to share the "DMA" buffer via mmap to
multiple accessors.  Since bt plugin has no DMA, it's impossible to
share the same device with dmix.

> If dmix to alsa-lib-slave isn't working now, would it be a 
> straightforward change for me to work on?

I guess the only solution is the old-good mixing server...

Any ideas?


Takashi


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