jittertracker.cpp

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// SPDX-License-Identifier: AGPL-3.0-or-later
 
#include <algorithm>
#include <cmath>
 
#include "jittertracker.h"
#include "logger.h"
 
void cJitterTracker::PacketReceived(void)
{
    auto now = std::chrono::steady_clock::now();
 
    m_packetCounter++;
 
    if (m_firstPacket) {
        m_lastTime = now;
        m_firstPacket = false;
 
        return;
    }
 
    auto diffMs = std::chrono::duration_cast<std::chrono::milliseconds>(now - m_lastTime).count();
 
    if (m_secondPacket) {
        m_lastDiffMs = diffMs;
        m_lastTime = now;
        m_secondPacket = false;
 
        return;
    }
 
    int jitterMs = std::abs(m_lastDiffMs - diffMs);
 
    if (jitterMs > m_longTermMaxJitterMs)
        m_longTermMaxJitterMs = jitterMs;
 
    if (jitterMs > m_shortTermMaxJitterMs)
        m_shortTermMaxJitterMs = jitterMs;
 
    // if (jitterMs > 35 && strcmp(m_identifier, "video") == 0)
    //     LOGDEBUG2(L_SOUND, "jittertracker: %s: %s: high jitter detected: packet no.: %d: %dms (last diff: %dms, time diff: %dms)", __FUNCTION__, m_identifier, m_packetCounter, jitterMs, m_lastDiffMs, diffMs);
 
    if (m_packetCounter % 1000 == 0) {
        // LOGDEBUG2(L_SOUND, "jittertracker: %s: %s: max jitter: last 1000 packets: %dms, overall: %dms,", __FUNCTION__, m_identifier, m_shortTermMaxJitterMs, m_longTermMaxJitterMs);
        m_shortTermMaxJitterMs = 0;
    }
 
    m_lastDiffMs = diffMs;
    m_lastTime = now;
}
 
void cJitterTracker::Reset(void)
{
    m_lastDiffMs = 0;
    m_shortTermMaxJitterMs = 0;
    m_packetCounter = 0;
    m_longTermMaxJitterMs = 0;
    m_firstPacket = true;
    m_secondPacket = true;
}