Re: [linux-audio-dev] Another Annoying "How Do I Get Started" Question

[Christopher Lee]

>>>>> "Benno" == Benno Senoner <[EMAIL PROTECTED]> writes:


    Benno> Not sure if it's enough for you, but since most pro-audio
    Benno> equipement has some intrinsic latency in it, then I think it's
    Benno> not worth the trouble to try to get single sample latency.  In
    Benno> theory it's possible but then you probably do need some special
    Benno> hardware that can interrupt you once per sample (eg 44100 times
    Benno> per second) possibly triggering an RTLinux module (without Linux
    Benno> cannot guarantee that your routine gets called in time) that
    Benno> does the actual DSP stuff.  You can guess the difficulty of
    Benno> achieving this from a programming effort point of view.  It
    Benno> would require you to write your own audio drivers, write an
    Benno> rtlinux kerel module, be careful what you do with the FPU (FPU
    Benno> flags need to be saved/restored while you are in kernel space)
    Benno> etc etc.

I've read that the fastest x86 intel architecture can do interrupts is w/
max latencies of 40us using rtlinux. You might be able to do at least the
interrupt part with a PPC-based system (1us interrupts).

-chris