[pulseaudio-discuss] PulseAudio for Embedded System

Marc-André Lureau marcandre.lureau at gmail.com
Mon May 14 08:22:33 PDT 2007


(I can't wait to see that in PulseAudio!)
Marc-André Lureau, GSmartMix

On 5/14/07, keith preston <keithpre at gmail.com> wrote:
> Marc-André,
> Have you been working on a fixed point resampling/mixing patch already?
> I've actually been working on pulseaudio a lot lately.   Although nothing
> is quite ready for patches yet, here a sample of what I've been working on:
> libspeex resampling patch.   I have this working in certain cases.  Most
> notably the embedded case, which is S16_LE audio in 1 or 2 channels.   I
> haven't really followed up with the libspeex guys, but I was going to wait
> for the resampling code API to stabilize in libspeex and be released, before
> I added a patch with a dependency to it.
> software volume/mixing (sample-utils.c)   I've been looking and thinking
> about how to rewrite this for efficiency.  I found on my embedded device CPU
> Utilization for from 5% to 100% whenever I have two streams with software
> volumes.   As a temporary measure for myself, my embedded platform has some
> proprietary audio mixing code I am using, but this code should be cleaned up
> a bit.
> Audio Class Policy,  this is really the big one and I'm sure you'll be
> interested in with the gsmartmix stuff.   I've added the concept of audio
> class to all the internal streams in pulseaudio and have a module that
> arbitrates between streams actively preempting streams, changing volume and
> such.   It is working pretty well right now.   I can have my music turn down
> when sound events happen that need my attention, I can block all audio when
> a VOIP call comes in, etc...
> Keith Preston
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