Hello there ,

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

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 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

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

Does this work on mobile GPU units on laptops?

Brent

Hi Nils,

Very cool! Unfortunately I have Ati Cards in both of my PC's so I can't test it . 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

cant test this,i got a asus eah3650

but couldnt get the other effects you made to work on that card either

Thanks for the plugin, but Reaper doesn't load it.

is this using CUDA? will absolutely not run on a 7 series card?
Last edited by VitaminD on Sat Jul 26, 2008 4:27 pm; edited 1 time in total

Yes it is using CUDA and unfortunately won't run on any 7xxx or Radeon card though...

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

This ain't for me. Stick to cpu so all can use your plugins.

Oh god damn it I'm on a GeForce FOAR.

But yeah, that is quite a task you've pulled...GPU doing other processing work. Wouldn't it interfere with display processes?

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?

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

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

I have a Geforce 7600 so I can't use it, but I applaud your endeavor! Good luck!

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%