OfflineAudioContext tail time when rendering a reverb effect

[arturogalan]

Hello everybody, I'm trying to implement something with OfflineAudioContext but I'm stuck on this problem:

1-I have a reverb effect AudioWorkletProcessor with a decay value that repeats the input sound several times like an echo, what it's called tail time.

2-If I use a new AudioContext, connect the reverb node, and reproduce a track then I can hear the original audio + the tail time that the effect adds to the original track length with the echo effect. The audio reproduces until the effect stops rendering the echo

const track = audioContext.createMediaElementSource(audioElement); track.connect(gainNode).connect(reverbNode).connect(audioContext.destination); track.mediaElement.play()

3-BUT when I use the OfflineAudioContext to try to get the track + reverb effect applied, I can listen to the rendered result audio but the track stops at the original length of the track, so I cannot hear all the effect tail time. It stops rendering before the effect ends

const offlineCtx = new OfflineAudioContext(
    decodedBuffer.numberOfChannels,
    decodedBuffer.length,
    decodedBuffer.sampleRate
  );  
  const reverbNodeOff = new AudioWorkletNode(offlineCtx, "reverb-processor");  

const source = new AudioBufferSourceNode(offlineCtx, {
    buffer: decodedBuffer,
  });  

  source.connect(reverbNodeOff).connect(offlineCtx.destination);  

  source.start() 

  const renderedBuffer = await offlineCtx.startRendering()  

  const song = new AudioBufferSourceNode(audioCtx, {
    buffer: renderedBuffer,
  });  
  song.connect(audioCtx.destination);  
  song.start();  

Is there a way to tell the OfflineAudioContext that should render until the effect stops?
I don't know if the problem is in the OfflineAudioContext.render, or I should add some logic in the definition of the AudioWorkletProcessor effect node
Please tell me if you need more context and thank you!

[chrisguttandin]

You would probably need to increase the length of your OfflineAudioContext by the number of samples of the tail time.

new OfflineAudioContext({
    length: decodedBuffer.length + TAIL_TIME_IN_SAMPLES,
    numberOfChannels: decodedBuffer.numberOfChannels,
    sampleRate: decodedBuffer.sampleRate
});

[arturogalan]

I tested that and the song duration is increased, but with silence