Reusing an instance of the resampler (MultiChannelResampler).

[Gilianp]

I am using resampler::MultiChannelResampler to simulate pitch shift with duration modification on small audio clips (piano). It works well when I instantiate a new resampler every time I want to play a note, but I would like to avoid this overhead and reuse the resampler instance. However, whenever I reuse it, I hear a click/pop at the beginning of playback, which is probably due to the resampler still having leftover data from the last use (playback can be stopped before the clip finishes completely). I would like to know if there is a way to clear the internal data of a resampler without needing to instantiate a new one.

I use the example from the Oboe resampler doc. So, when I press a key, the resampler is filled with frames, and I wait for the resampler's output when this happens. As here: https://github.com/google/oboe/tree/main/src/flowgraph/resampler

int outputFramesLeft = numOutputFrames;
while (outputFramesLeft > 0) {
    if(resampler->isWriteNeeded()) {
        const float *frame = getNextInputFrame(); // you provide this
        resampler->writeNextFrame(frame);
    } else {
        resampler->readNextFrame(outputBuffer);
        outputBuffer += channelCount;
        outputFramesLeft--;
    }
}

After using this resampler, which can stop being filled at any moment (when releasing the piano key), I want to reassign it to a new note that is pressed. However, when using the same instance, a click/pop occurs in the first frames of the new audio clip, which I imagine is due to leftover data from its last use. Therefore, I would like to know how to clear the resampler so it can be reused without this issue.