newDominantSpeakerValue will be null when dominantSpeaker is always talking

[simo-an]

at DominantSpeakerIdentification.java

            if (enableSilence && dominantSpeaker != null && newDominantId == dominantSpeaker.id)
            {
                // We're not in a silence period, and none of the non-dominant speakers won the challenge. Check if
                // the current dominant speaker has been silent for the timeout period, and if so switch to "silence"
                // mode.
                long timeSinceNonSilence = now - dominantSpeaker.lastNonSilence;
                if (timeSinceNonSilence > timeoutToSilenceInterval)
                {
                    newDominantId = null;
                }
            }

as above code, we know that you are relying lastNonSilence to judge whether newDominantId is null

        private void evaluateLongSpeechActivityScore(long now)
        {
            longSpeechActivityScore = computeSpeechActivityScore(longs[0], N3, 47);
            if (longSpeechActivityScore > MIN_SPEECH_ACTIVITY_SCORE)
            {
                lastNonSilence = now;
            }
        }

lastNonSilence is updated only at evaluateLongSpeechActivityScore

        synchronized void evaluateSpeechActivityScores(long now)
        {
            if (computeImmediates())
            {
                evaluateImmediateSpeechActivityScore();
                if (computeMediums())
                {
                    evaluateMediumSpeechActivityScore();
                    if (computeLongs())
                    {
                        evaluateLongSpeechActivityScore(now);
                    }
                }
            }
        }

evaluateLongSpeechActivityScore only be called at evaluateSpeechActivityScores

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If dominantSpeaker is always talking, the longs would not change. so, evaluateLongSpeechActivityScore won't be called, and lastNonSilence won't be updated.

So, newDominantId maybe set to null and fire fireActiveSpeakerChanged(null);