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Author Topic: Free: Convolution Reverb for NVidia GPUs - saving CPU time
Nils Schneider
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PostPosted: Sat Jul 26, 2008 10:40 am reply with quote
Hello there Cool,

I experimented again with the use of GPUs for audio processing. This time, I created a convolution reverb that runs entirely on a NVidia graphics processor, saving CPU time to be used for other effects or instruments.

This is a very early version only, but it least it computes a nice stereo convolution reverb in realtime on my Geforce 8600 GT for nothing Love

It would be nice if there would be as many people as possible to test it.

The program requires a NVidia graphics adapter with at least
a G80 gpu (Geforce 8 series or later) and the latest NVidia
ForceWare driver available to run properly.

Download: http://www.nilsschneider.de/files/nsGPUImpulseReve rbVSTSetup.exe

Because this is just a proof-of-concept, the GPU code is not
very optimized, the GPU usage is quite high and the plugin
still has a high latency of 8192 samples.

Ideas from people that have knowlege about low-latency
convolution are welcome Smile I'm sure with a good algorithm,
a GPU could run hundereds of instances, it's a damn fast
co-processor!

Known issues:

- Latency is 8192 samples at the moment, this depends on the
poor algorithm, as mentioned above

- The impulse response must be 2 channels, i.e. stereo

- There is no resampling of the impulse response yet, meaning
that if the samplerate of the IR doesn't match the
samplerate of the host, the IR appears to be pitched.

- Multiple instances may degrate performance or won't work
at all, this will be fixed in a future release

- No nice GUI, I just were too lazy to code a good one Smile

If you have any comments, questions or bugs, feel free to post here or contact me. I'll post updates here if they become available, but checking out my website http://www.nilsschneider.de will be worth checking, too, as I'll post the project there, too.

Thanks in advance for trying this one out!

Nils Cool
^ Joined: 22 Oct 2004  Member: #45370  Location: Neuss, Germany
koolkeys
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PostPosted: Sat Jul 26, 2008 10:51 am reply with quote
Does this work on mobile GPU units on laptops?

Brent
^ Joined: 02 Dec 2003  Member: #10739  Location: Nashville, TN
timnl85
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PostPosted: Sat Jul 26, 2008 10:57 am reply with quote
Hi Nils,

Very cool! Unfortunately I have Ati Cards in both of my PC's so I can't test it Sad . Didn't you make another plugin a while ago wich also ran on gpu's?

Tim

Edit: found the thread: http://www.kvraudio.com/forum/viewtopic.php?t=1530 73&postdays=0&postorder=asc&start=0
^ Joined: 12 Apr 2005  Member: #64927  Location: The Netherlands
S-N-S
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PostPosted: Sat Jul 26, 2008 11:12 am reply with quote
cant test this,i got a asus eah3650

but couldnt get the other effects you made to work on that card either Crying or Very sad
^ Joined: 02 Jan 2008  Member: #169659  Location: denmark
s_t
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PostPosted: Sat Jul 26, 2008 3:36 pm reply with quote
Thanks for the plugin, but Reaper doesn't load it.
^ Joined: 24 Dec 2004  Member: #52599  
VitaminD
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PostPosted: Sat Jul 26, 2008 3:56 pm reply with quote
is this using CUDA? will absolutely not run on a 7 series card?
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Last edited by VitaminD on Sat Jul 26, 2008 4:27 pm; edited 1 time in total
^ Joined: 11 Mar 2002  Member: #2027  Location: in a state of confusion
Nils Schneider
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PostPosted: Sat Jul 26, 2008 4:24 pm reply with quote
Yes it is using CUDA and unfortunately won't run on any 7xxx or Radeon card though...
^ Joined: 22 Oct 2004  Member: #45370  Location: Neuss, Germany
hifiboom
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PostPosted: Sat Jul 26, 2008 8:34 pm reply with quote
Nils, I have an 8800 GTS card and did try to load your plug-in, but could not get it to work.

do I have to install additional cuda software? or a special driver pack?
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Zaphod (giancarlo)
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PostPosted: Sun Jul 27, 2008 3:51 am reply with quote
hifiboom wrote:
Nils, I have an 8800 GTS card and did try to load your plug-in, but could not get it to work.

do I have to install additional cuda software? or a special driver pack?


maybe you need to install the right video driver and (I guess) the right cuda toolkit
^ Joined: 23 Jun 2006  Member: #111268  
jobromedia
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PostPosted: Sun Jul 27, 2008 4:06 am reply with quote
This ain't for me. Stick to cpu so all can use your plugins.
^ Joined: 10 Feb 2006  Member: #97780  Location: Stockholm, Sweden
MaliceX
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PostPosted: Sun Jul 27, 2008 4:25 am reply with quote
Oh god damn it I'm on a GeForce FOAR. Razz

But yeah, that is quite a task you've pulled...GPU doing other processing work. Wouldn't it interfere with display processes?
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Helix, KarmaFX Synth, Hypersonic 2, Shortcircuit, ACID, SW1000XG, Oatmeal, Atlantis, Clavinova (soon).
^ Joined: 26 Jul 2005  Member: #76065  Location: Aussieland, VIC
s_t
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PostPosted: Sun Jul 27, 2008 5:18 am reply with quote
I got it working ok with wavosaur.
No additional software was needed in this case (9600gt with recent drivers)
Hopefully later versions work in reaper too?
^ Joined: 24 Dec 2004  Member: #52599  
Nils Schneider
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PostPosted: Sun Jul 27, 2008 9:28 am reply with quote
jobromedia wrote:
Stick to cpu so all can use your plugins.


I want to create something *new*, not reinventing the wheel again Smile

The problem seems to be that the installer has to copy the cuda DLLs to the system32 dir instead of the plugin dir, I'll release a new version soon that will fix this issue.

If anyone wants to try it out, copy the cuda*.dll to the system32 dir of windows.

Or just wait for the new version Smile
^ Joined: 22 Oct 2004  Member: #45370  Location: Neuss, Germany
TristezaOrange
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PostPosted: Sun Jul 27, 2008 9:32 am reply with quote
I have a Geforce 7600 so I can't use it, but I applaud your endeavor! Good luck! Very Happy
^ Joined: 20 Aug 2001  Member: #950  Location: Athens, Greece!
Nils Schneider
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PostPosted: Sun Jul 27, 2008 9:35 am reply with quote
s_t wrote:
I got it working ok with wavosaur.


Could you give me some details? How much CPU did the plugin use (I hope nearly nothing?). What GPU usage did you have and how long were the impulse responses that you used?

I've got 67% GPU usage for a 17 second IR, CPU usage below 1%
^ Joined: 22 Oct 2004  Member: #45370  Location: Neuss, Germany
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