!7

cmodule AudioFeedbackPreventer > DynPrintLogAndEnabled {
  // from end of talking to recognition coming in
  switchable double expectedDelay = 2.0;
  
  transient long talkingSince;
  transient LongRange lastTalked;
  
  start {
    dm_vmBus_onMessage talking(r { talkingSince = sysNow() });
    dm_vmBus_onMessage doneTalking(r {
      lastTalked = longRange(talkingSince, sysNow());
      talkingSince = 0;
    });
  }
  
  // API
  
  bool recognizedSpeechIsProbablyMyOwnUtterance() {
    if (isTrue(dm_haveHeadphones())) false; // Voice output goes to headphones, so we can't hear it
    if (talking) true;
    ret lastTalked != null && elapedSeconds_sysNow(lastTalked.end) <= expectedDelay;
  }
}