tone.tools.ts

function trimSilenceFromBuffer(buffer, threshold = 0.001, minSilenceDuration = 0.1) {
  const sampleRate = Tone.context.sampleRate;
  const channelData = buffer.getChannelData(0); // Assuming mono audio for simplicity
  
  let endOfAudioIndex = channelData.length - 1;
  let silenceDuration = 0;
  
  // Iterate backwards through the buffer
  for (let i = channelData.length - 1; i >= 0; i--) {
    const sample = Math.abs(channelData[i]); // Get the absolute value of the sample
    if (sample <= threshold) {
      silenceDuration += 1 / sampleRate;
      if (silenceDuration >= minSilenceDuration) {
        endOfAudioIndex = i + (silenceDuration * sampleRate);
        break;
      }
    } else {
      silenceDuration = 0; // Reset if the sample is above the threshold
    }
  }

  // Trim the buffer
  const trimmedLength = endOfAudioIndex + 1;
  const trimmedBuffer = new Tone.Buffer(trimmedLength);
  const trimmedChannelData = trimmedBuffer.getChannelData(0);
  
  for (let i = 0; i < trimmedLength; i++) {
    trimmedChannelData[i] = channelData[i];
  }

  return trimmedBuffer;
}


const trimmedBuffer = trimSilenceFromBuffer(buffer, 0.001, 0.1);