[PD] Pd on a headless Raspberry Pi

[James Dunn]

I've had issues with the audio out as well as USB audio but changing the 
sample rate to 48000 for the USB audio interface works great. I haven't 
tried it with pd yet as it was for a different project using Darkice to 
broadcast the sound of a cafe from 6am until 12pm GMT 
(http://radeq.vacau.com), but as soon as I get the pi back I'll be 
looking into pd again...

James

Quoth Pierre Massat, on 29/08/2012 20:53:
> This is all very interesting!
>
> To get back to my initial problem, i managed to solve it by launching 
> Pd with a longer audio buffer (-audiobuf 100). For some reason Pd came 
> with a default buffer of 25ms.
>
> Now, I can't tell you whether it sounds as "good" or worse than the 
> same audio data played in aplay. I'll need to test this further.
>
> Cheers,
>
> Pierre.
>
> 2012/8/29 Tedb0t <lists at liminastudio.com <mailto:lists at liminastudio.com>>
>
>     Ah, wow, that's crazy.  Has anyone yet tried out any USB audio
>     interfaces on the RPi yet?  I have one handy that I can try but
>     not until I get these client projects out of the way ;)
>
>     I'm extremely curious if using a supported external audio
>     interface solves all the sound problems or if there are also still
>     alsa issues.  I'm also now wondering who will be the first to come
>     out with an RPi audio "shield" ;)
>
>     This renews my interest in modifying the RPi design to make a
>     Pd-friendly board that's intended to be headless with a built-in
>     quality DAC.  But without RPi's supply chain hookups, it'd be
>     quite hard to keep the price down to the RPi's level!
>
>     ---t3db0t
>
>     On Aug 29, 2012, at 1:08 PM, Andy Farnell wrote:
>
>     >
>     >
>     > Yes I heard that too. It's single bit PWM modulated output.
>     > Basically there's no DAC, so audio output is a fun hack,
>     > and likely as good as it's worth trying to make it for
>     > simple applications.
>     >
>     > If you want good quality audio I/O there are things like
>     > Turtle Beach Amigo for about 15 quid
>     >
>     http://www.turtlebeach.com/products/sound-cards/audio-advantage-amigo-ii.aspx
>     >
>     > You can take it out the board from its plastic housing. Its about
>     > as small as an SD card.
>     >
>     > a.
>     >
>     > On Wed, Aug 29, 2012 at 04:40:44PM +0200, Pierre Massat wrote:
>     >> There's a guy called "dom" on the RPi forum who seems to be
>     involved in
>     >> audio development. I've seen his interventions in a couple of
>     audio related
>     >> threads, and i got the information about the analog output
>     being simple
>     >> filtered PWM off one of his posts.
>     >> Might be interesting to get in touch with him.
>     >>
>     >> Pierre.
>     >>
>     >> 2012/8/29 Tedb0t <lists at liminastudio.com
>     <mailto:lists at liminastudio.com>>
>     >>
>     >>> This is what I'm curious about; who is doing this alsa
>     development, where,
>     >>> and can we pitch in?  We are all interested  in getting the
>     sound working
>     >>> better on the Pi...
>     >>>
>     >>> That said, it seems like the jury is out on if it's an alsa
>     problem or a
>     >>> Pd problem.  I seem to have experienced both.
>     >>>
>     >>> ---Tedb0t
>     >>>
>     >>> On Aug 29, 2012, at 6:46 AM, geoffroy wrote:
>     >>>
>     >>> With the PI the alsa is in alpha development on the arm
>     platform and
>     >>> therefor won't be at it's best for a little while. The
>     floating point
>     >>> integration in the latest system made the audio a lot better,
>     as on the
>     >>> first gen OS of the PI the audio was just impossible.
>     >>>
>     >>>
>     >>>
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