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ATV Demod: classical vsync enhanced hsync correction: correcting only once per full frame with amortizing

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This commit is contained in:
f4exb 2017-04-06 05:11:48 +02:00
parent 6dbbbec71d
commit 5cdcfdb9be
1 changed files with 23 additions and 13 deletions
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36
plugins/channelrx/demodatv/atvdemod.h
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@ -528,25 +528,34 @@ private:
bool blnNewLine = false;
if (m_blnSynchroDetected)
{
m_intAvgColIndex = m_intSampleIndex - m_intColIndex - (m_intColIndex < m_intNumberSamplePerLine/2 ? 150 : 0);
//qDebug("HSync: %d %d %d", m_intSampleIndex, m_intColIndex, m_intAvgColIndex);
m_intSampleIndex = 0;
}
else
{
m_intSampleIndex++;
}
if (!m_objRunning.m_blnHSync && (m_intColIndex >= m_intNumberSamplePerLine)) // H Sync not active
{
m_intColIndex = 0;
blnNewLine = true;
}
else if (m_objRunning.m_blnHSync && m_blnSynchroDetected // Valid H sync detected
&& (m_intColIndex > m_intNumberSamplePerLine - m_intNumberSamplePerTop)
&& (m_intColIndex < m_intNumberSamplePerLine + m_intNumberSamplePerTop))
{
// qDebug("HSync: %d", m_intColIndex);
// m_intColIndex = 0;
m_intAvgColIndex = m_objAvgColIndex.run(m_intColIndex);
m_intColIndex = m_intColIndex - m_intAvgColIndex;
blnNewLine = true;
}
else if (m_intColIndex >= m_intNumberSamplePerLine + m_intNumberSamplePerTop) // No valid H sync
{
//qDebug("HLine: %d", m_intColIndex);
m_intColIndex = m_intNumberSamplePerTop;
if (m_objRunning.m_blnHSync && (m_intLineIndex == 0))
{
//qDebug("HSync: %d %d", m_intColIndex, m_intAvgColIndex);
m_intColIndex = m_intNumberSamplePerTop + m_intAvgColIndex/4; // amortizing 1/4
}
else
{
m_intColIndex = m_intNumberSamplePerTop;
}
blnNewLine = true;
}
@ -585,7 +594,8 @@ private:
// Filling pixels
m_objRegisteredATVScreen->setDataColor(m_intColIndex - m_intNumberSaplesPerHSync + m_intNumberSamplePerTop, intVal, intVal, intVal);
// +4 is to compensate shift due to hsync amortizing factor of 1/4
m_objRegisteredATVScreen->setDataColor(m_intColIndex - m_intNumberSaplesPerHSync + m_intNumberSamplePerTop + 4, intVal, intVal, intVal);
m_intColIndex++;
// Vertical sync and image rendering