[alsa-devel] Compressed Audio Playback/Capture through ALSA framework

pl bossart bossart.nospam at gmail.com
Wed Mar 16 18:52:23 CET 2011

> It would be nice to have a standard userspace API for this but I'm not
> aware of anyone who's looked at it in detail and you start having to
> also take into account other algorithms that are running on the device
> so there's nothing to point people at right now and no real prospect of
> there being.  I don't know if it's something we can resolve entirely in
> the kernel as I'm aware that some of the DSP implementations have
> non-trivial management code in userspace that they talk to which may
> mean that the standard API has to be a userspace one.  There's also the
> difference between memory to memory implementations (which fit into a
> userspace chain much more readily) and tunneled implementations (which
> do need new infrastructure).
> I think this'll get substantially easier to look at once the media
> controller API is merged and starts to be used in the audio subsystem.

I must be missing something here. Why would this media controller API
make things simpler? Based on what was presented at LPC, I don't
understand this last part.

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