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libPd Logged Exception: AudioWrapper: no input buffer available

anthropomoanthropomo Posts: 10
edited December 2012 in Pd Everywhere

So I was trying to use libpd as a service and it seemed to be working (making expected noises, not crashing). But logcat was spitting out this exception 3-4 times per second: AudioWrapper: no input buffer available

I tracked it to this part of PdCore (at line 112):

I won't bog this down with my jumble of nascent code (mostly just trying to get libpd as a service up and running). But does anybody have an idea where this section of code is most likely called so I can start trying to track this down?


  • pbrinkmannpbrinkmann Posts: 686 ✭✭

    What device and Android version are you using? How did you configure your audio (sample rate, buffer size, etc.)?

    At this point, I think the best solution is to just switch to the opensl branch of pd-for-android. That should take care of the warnings you're seeing.

  • Ah...

    I am actually currently running from the master branch, here:

    The above link was just the one that turned up when I googled that exception.

    I had also assumed the master had incorporated the opensl which I read read about elsewhere. So, good to know. I'll get on that after answering your questions. Then I'll come back and let you know if I am error free.

    Device is a Motorola Droid3 running 2.3.4.

    And this is straight from the book:
    int sampleRate = AudioParameters.suggestSampleRate();
    pdService.initAudio(sampleRate, 1, 2, 10.0f);

  • I'm throwing myself on the mercy of the court. Can anybody point me in the direction of help on switching to the opensl branch. Pretty new to git/github.

  • pbrinkmannpbrinkmann Posts: 686 ✭✭
    edited December 2012

    Clone a fresh copy of Pd for Android. Then, in your pd-for-android directory, say

    git checkout opensl

    git submodule init

    git submodule update

    In Eclipse, delete the old version and import the new one.

  • A day later and several hundred megabytes of SDK later (I hadn't gotten around to dl'ing 4.2 yet), we're done with the input error!

    After trying most combinations from the samples, I seem to get the best latency with this:

    pdService.initAudio(sampleRate, 0, 2, 8);

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