• Posts
  • RSS
  • ◂◂RSS
  • Contact

  • Goodbye ChucK; hello straight C with JACK

    May 1st, 2010
    looper, music, tech
    The chuck-using looper software was being too annoying. I couldn't figure out why latency was being slightly off and variable between runs, I couldn't figure out how to get it to run realtime, and chuck kept crashing when I went to record long loops, giving:
    subgraph starting at RtApiJack timed out (subgraph_wait_fd=9, status = 0, state = Running, pollret = 0 revents = 0x0)
    I decided to have a look at writing this in straight C against the JACK api. Which seems to have worked quite well. It wasn't that much work, and now I know exactly what's going on. Chuck was good for prototyping, and really easy to get started with, but I have a lot more trust in this new version. One downside is that unless OSX has /dev/input/mouse then this is linux only. Which is sad. If there's an easy fast way to get mouse events on OSX I could add it.

    So. This requires at leas the following:

    $ sudo apt-get install jackd libjack-dev
    $ gcc -std=c99 -o looper_sync -ljack -lpthread -lrt looper_sync.c
    $ sudo chmod ugo+r /dev/input/mouse*
    $ jackd -d alsa -p 256 &
    $ ./looper_sync
    Unfortunately, while I was testing this one last time before writing it up, I managed to get the exact same "subgraph timed out" error in the C version that I'd gotten in the chuck version. I don't get it as easily in the new version; sometimes I can record three full length loops and not get it. Perhaps, though, this error means I'm trying to do too much work on one processing cycle? I need to look at it more. On my desktop it runs great, so I'm thinking it has to do with the eeepc being substantially less powerful.

    Comment via: facebook

    Recent posts on blogs I like:

    Rereading Roald Dahl

    Taking out a few words doesn't change much. The post Rereading Roald Dahl appeared first on Otherwise.

    via Otherwise March 25, 2023

    What does Bing Chat tell us about AI risk?

    Early signs of catastrophic risk? Yes and no.

    via Cold Takes February 28, 2023

    Why Neighborhoods Should Have Speed Bumps

    I have several reasons I think why neighborhoods should have speed bumps. First, speed bumps are very useful to stop cars from hitting people in the streets. Second, when construction workers installed speed bumps on the street in front of our house it was v…

    via Lily Wise's Blog Posts February 27, 2023

    more     (via openring)


  • Posts
  • RSS
  • ◂◂RSS
  • Contact