linuxaudio.org

On Mon, 2009-08-10 at 17:40 -0400, David Robillard wrote:
> > Software is the free 'C for CUDA' compiler and SDK from Nvidia

quoted text
>

> Latency low enough to make realtime use feasible?

What I do is - imagining that I am a Jack client with near zero

processing time - what I do is that I 'receive previous/send next/launch

kernel' in one go. Current process is in principle a 192 voice Minimoog

style polysynth with 4 external audio inputs + a ton of midi in. Mixdown

to 16 stereo (midi)channels, further mixdown to 8 out (1 stereo 'house'

+ 3 stereo 'fx send') Sorting the dynamically assigned voices to their

respective channels is currently the main bottleneck - or so it seems.
With buffersize 3 × 1.3 ms @96KHz I have clockcycles to spare and can at

ease display a stream of video (320×200) simultaniosly for doing a

soundtrack to some movie or something. And more ...
With buffersize 3 × 0.7 ms .. I'll have to back off somewhat regarding

number of voices.
With buffersize 3 × 0.3 ms .... nope, can't do that, sorry! (but still

works for code on the host)
The Jack interface is not really here yet though. It must be understood

that there can only be one transfer to the device for each run which

must include all inputs, otherwise you'll get absolutely nothing done.

That transfer can OTOH be pretty huge, way more than I personally have

any use for at this point in time.
64in + 64 out @96KHz + lots of controllers, left in some place we all

(as well as Jack) knows about would not be asking for too much from the

hardware. That is not the problem.
The general hostility against non-GPL software is tougher though, and

unfortunately makes me feel like - by presenting these ideas - like I've

just dressed up in pink rubber-suit with a sign on my back saying "puke

on me" ...
Oh well, you'll have to wipe off your own monitors when you are done :-D
/j
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