[PD] Raspberry Pi : DSP on the GPU ? (WAS : Message from the boss of Raspberry Pi Foundation !)

[Pierre Massat]

Hi again Katja,

I just read through it. Couldn't find anything about having the GPU process
some audio. It's really mostly about why it's a bad (or good) thing to keep
the GPU closed-source (at least that's what I understand [?]).

So I guess there isn't must we can do on our own to access the GPU. But
then, what can Eben and his team do about it ? I'd like to know what answer
we can give him. If he says "just waiting for an application like this" I
am assuming that it must have aroused his interest somehow. And I believe
that it would be great if people in the Pd community got involved. All I
can provide is some testing, but others could contribute more (if i'm not
mistaken, Miller Puckette did a great job fixing the analog out for
instance). I think we should try and play a part in the development of the
Pi. And if we're lucky we'll finally have that Pd box people have been
dreaming about for years.

Cheers,

Pierre.

2013/2/9 katja <katjavetter at gmail.com>

> Hi Pierre,
>
> There has been intensive discussion about GPU processing on RPI:
>
> http://www.raspberrypi.org/phpBB3/viewtopic.php?f=33&t=6188
>
> Did you read it? In the light of this discussion, I wonder what Eben means
> when writing "We have a bunch of GPU compute available on the device just
> waiting for an application like this."
>
> Anyway it's great they have put your project on RPi blog. You will be
> famous, Pi Massat! Congrats again.
>
> Katja
>
>
>
> On Fri, Feb 8, 2013 at 10:51 AM, Pierre Massat <pimassat at gmail.com> wrote:
>
>> Dear all,
>>
>> Please read below the message I received from Eben Upton, the boss of
>> Raspberry Pi foundation.
>> It looks like he was impressed by the video I made, and he says that
>> there's a possibility of letting the GPU do some DSP computation.
>> I guess you'll all agree that this is awesome news.
>>
>> I have no idea how we can proceed now. I think i'm absolutely incapable
>> of doing anything useful in this field, so i told him that i would transfer
>> this message to you, hoping that Miller, HC, Katja (and others) would know
>> what needs to be done. We should probably ask him if you guys could work
>> directly with their developers.
>>
>> Let me know what you think.
>>
>> Cheers!
>>
>> Pierre.
>>
>> ---------- Forwarded message ----------
>> From: Eben Upton <eben at raspberrypi.org>
>> Date: 2013/2/8
>> Subject: Re: RPi as multi-effects for guitar
>> To: Pierre Massat <pimassat at gmail.com>
>>
>>
>> Hi Pierre
>> Awesome stuff - I think Liz is preparing a blog post about this as we
>> speak. I'd be very interested in knowing a bit more about the DSP code
>> that runs this stuff. We have a bunch of GPU compute available on the
>> device just waiting for an application like this.
>>
>> Cheers
>> Eben
>>
>> On Thu, Feb 7, 2013 at 2:29 AM, Pierre Massat <pimassat at gmail.com> wrote:
>> > Hi,
>> >
>> > I write a blog about how to make guitar effects with computers running
>> Pure
>> > Data in real-time.
>> > When I first heard about the Raspberry Pi I thought it would be great
>> if I
>> > could use it for the same purpose. It would only be much cheaper, and
>> much
>> > smaller than my current laptop, and could fit in my hand-made stompbox.
>> > Recent improvements in Raspbian have finally made this possible, and
>> this
>> > makes me very happy !
>> > The Raspberry Pi is now actually capable of running rather demanding
>> Pure
>> > Data patches in (quasi-) real-time (at least with a latency that's low
>> > enough to play live with it).
>> > I quickly assembled a small patch to test it and make a video to
>> demonstrate
>> > that it actually works very well.
>> >
>> > It is obviously not the use the RPi was originally intended for, but to
>> me
>> > (and I'm sure to other musicians as well), this sounds like a
>> revolution.
>> >
>> > I'm currently documenting my setup on my blog :
>> > - video :
>> >
>> http://guitarextended.wordpress.com/2013/01/27/real-time-guitar-effects-with-raspberry-pi-pd-and-arduino/
>> > - blog post about hardware :
>> >
>> http://guitarextended.wordpress.com/2013/01/31/raspberry-pi-multi-effects-overview-of-the-setup/
>> >
>> > There's no trick, the Pi really IS doing all the DSP work. A reader
>> posted a
>> > comment to ask where the computer was :)
>> >
>> > I take this opportunity to thank the RPi foundation for all the good
>> work
>> > you put in this amazing tiny thing. I see that the cam should be out in
>> a
>> > few months, this is all very exciting. I'm sure the Pi has already
>> changed
>> > the life of a lot of people !
>> >
>> > Cheers,
>> >
>> > Pierre.
>> >
>> >
>> >
>>
>>
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