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<blockquote data-quote="tourettes" data-source="post: 661501" data-attributes="member: 10858">dAdjustment adjustment is not calculated at all, It is either 1.0, 0.997 or 1.003. This is used for the minor v-sync position correctins and it is the EVR presenter who decides what adjustment should be used - basicly it will slowly move the v-sync into correct position by resampling the audio a bit. So, m_dAdjustment is not related to the audio HW clock at all.[code]void MPEVRCustomPresenter::AdjustAVSync(double currentPhaseDiff){&nbsp; // Keep a rolling average of last X deviations from target phase. &nbsp; // These numbers have values between -0.5 and 0.5&nbsp; int tempNextPhDev = (m_nNextPhDev % NUM_PHASE_DEVIATIONS);&nbsp; m_sumPhaseDiff -= m_dPhaseDeviations[tempNextPhDev];&nbsp; m_dPhaseDeviations[tempNextPhDev] = currentPhaseDiff;&nbsp; m_sumPhaseDiff += currentPhaseDiff;&nbsp; m_nNextPhDev++;&nbsp; double averagePhaseDifference = m_sumPhaseDiff / NUM_PHASE_DEVIATIONS;&nbsp; &nbsp; m_avPhaseDiff = averagePhaseDifference;&nbsp; // If we are getting close to target then stop correcting.&nbsp; // Since it is a rolling average we will overshoot the target, so we plan to stop early.&nbsp; // If we are speeding up, we should stop when above the &quot;green&quot; limit&nbsp; if (m_dVariableFreq &gt; 1.0)&nbsp; {&nbsp; &nbsp; if (averagePhaseDifference &gt; -0.05 )&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; m_dVariableFreq = 1.0;&nbsp; &nbsp; }&nbsp; }&nbsp; // If we are slowing down, we should stop when below the &quot;green&quot; limit&nbsp; if (m_dVariableFreq &lt; 1.0)&nbsp; {&nbsp; &nbsp; if (averagePhaseDifference &lt; 0.05 )&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; m_dVariableFreq = 1.0;&nbsp; &nbsp; }&nbsp; }&nbsp; // If we have drifted significantly away from target, let us speed up or slow down until we are within above limits again&nbsp; if (averagePhaseDifference &gt; 0.1)&nbsp; {&nbsp; &nbsp; m_dVariableFreq = 1.003;&nbsp; }&nbsp; if (averagePhaseDifference &lt; -0.1)&nbsp; {&nbsp; &nbsp; m_dVariableFreq = 0.997;&nbsp; }&nbsp; //Log(&quot;VF: %f averagePhaseDif: %f CP: %f &quot;, m_dVariableFreq, averagePhaseDifference, currentPhase);&nbsp; if (m_pAVSyncClock &amp;&amp; m_dVariableFreq != m_dPreviousVariableFreq)&nbsp; {&nbsp; &nbsp; m_pAVSyncClock-&gt;AdjustClock(1.0/m_dVariableFreq);&nbsp; &nbsp; m_iClockAdjustmentsDone++;&nbsp; }&nbsp; m_dPreviousVariableFreq = m_dVariableFreq;}[/code]</blockquote>

[QUOTE="tourettes, post: 661501, member: 10858"] dAdjustment adjustment is not calculated at all, It is either 1.0, 0.997 or 1.003. This is used for the minor v-sync position correctins and it is the EVR presenter who decides what adjustment should be used - basicly it will slowly move the v-sync into correct position by resampling the audio a bit. So, m_dAdjustment is not related to the audio HW clock at all. [code] void MPEVRCustomPresenter::AdjustAVSync(double currentPhaseDiff) { // Keep a rolling average of last X deviations from target phase. // These numbers have values between -0.5 and 0.5 int tempNextPhDev = (m_nNextPhDev % NUM_PHASE_DEVIATIONS); m_sumPhaseDiff -= m_dPhaseDeviations[tempNextPhDev]; m_dPhaseDeviations[tempNextPhDev] = currentPhaseDiff; m_sumPhaseDiff += currentPhaseDiff; m_nNextPhDev++; double averagePhaseDifference = m_sumPhaseDiff / NUM_PHASE_DEVIATIONS; m_avPhaseDiff = averagePhaseDifference; // If we are getting close to target then stop correcting. // Since it is a rolling average we will overshoot the target, so we plan to stop early. // If we are speeding up, we should stop when above the "green" limit if (m_dVariableFreq > 1.0) { if (averagePhaseDifference > -0.05 ) { m_dVariableFreq = 1.0; } } // If we are slowing down, we should stop when below the "green" limit if (m_dVariableFreq < 1.0) { if (averagePhaseDifference < 0.05 ) { m_dVariableFreq = 1.0; } } // If we have drifted significantly away from target, let us speed up or slow down until we are within above limits again if (averagePhaseDifference > 0.1) { m_dVariableFreq = 1.003; } if (averagePhaseDifference < -0.1) { m_dVariableFreq = 0.997; } //Log("VF: %f averagePhaseDif: %f CP: %f ", m_dVariableFreq, averagePhaseDifference, currentPhase); if (m_pAVSyncClock && m_dVariableFreq != m_dPreviousVariableFreq) { m_pAVSyncClock->AdjustClock(1.0/m_dVariableFreq); m_iClockAdjustmentsDone++; } m_dPreviousVariableFreq = m_dVariableFreq; } [/code] [/QUOTE]

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