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Add DVB-S2 modulator

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This commit is contained in:
Jon Beniston
2021-03-31 16:41:42 +01:00
parent c4e9ada144
commit 0857f1348a
23 changed files with 4114 additions and 76 deletions
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plugins/channeltx/moddatv/datvmodsource.cpp
+189 -46
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@@ -74,49 +74,10 @@ int DATVModSource::getTSBitrate(const QString& filename)
// Get data bitrate (i.e. excluding FEC overhead)
int DATVModSource::getDVBSDataBitrate(const DATVModSettings& settings)
{
float rsFactor = DVBS::tsPacketLen/(float)DVBS::rsPacketLen;
float convFactor;
float fecFactor;
float plFactor;
float bitsPerSymbol;
switch (settings.m_fec)
{
case DATVModSettings::FEC12:
convFactor = 1.0f/2.0f;
break;
case DATVModSettings::FEC23:
convFactor = 2.0f/3.0f;
break;
case DATVModSettings::FEC34:
convFactor = 3.0f/4.0f;
break;
case DATVModSettings::FEC56:
convFactor = 5.0f/6.0f;
break;
case DATVModSettings::FEC78:
convFactor = 7.0f/8.0f;
break;
case DATVModSettings::FEC45:
convFactor = 4.0f/5.0f;
break;
case DATVModSettings::FEC89:
convFactor = 8.0f/9.0f;
break;
case DATVModSettings::FEC910:
convFactor = 9.0f/10.0f;
break;
case DATVModSettings::FEC14:
convFactor = 1.0f/4.0f;
break;
case DATVModSettings::FEC13:
convFactor = 1.0f/3.0f;
break;
case DATVModSettings::FEC25:
convFactor = 2.0f/5.0f;
break;
case DATVModSettings::FEC35:
convFactor = 3.0f/5.0f;
break;
}
switch (settings.m_modulation)
{
case DATVModSettings::BPSK:
@@ -136,16 +97,113 @@ int DATVModSource::getDVBSDataBitrate(const DATVModSettings& settings)
break;
}
return std::round(settings.m_symbolRate * bitsPerSymbol * rsFactor * convFactor);
if (settings.m_standard == DATVModSettings::DVB_S)
{
float rsFactor;
float convFactor;
rsFactor = DVBS::tsPacketLen/(float)DVBS::rsPacketLen;
switch (settings.m_fec)
{
case DATVModSettings::FEC12:
convFactor = 1.0f/2.0f;
break;
case DATVModSettings::FEC23:
convFactor = 2.0f/3.0f;
break;
case DATVModSettings::FEC34:
convFactor = 3.0f/4.0f;
break;
case DATVModSettings::FEC56:
convFactor = 5.0f/6.0f;
break;
case DATVModSettings::FEC78:
convFactor = 7.0f/8.0f;
break;
case DATVModSettings::FEC45:
convFactor = 4.0f/5.0f;
break;
case DATVModSettings::FEC89:
convFactor = 8.0f/9.0f;
break;
case DATVModSettings::FEC910:
convFactor = 9.0f/10.0f;
break;
case DATVModSettings::FEC14:
convFactor = 1.0f/4.0f;
break;
case DATVModSettings::FEC13:
convFactor = 1.0f/3.0f;
break;
case DATVModSettings::FEC25:
convFactor = 2.0f/5.0f;
break;
case DATVModSettings::FEC35:
convFactor = 3.0f/5.0f;
break;
}
fecFactor = rsFactor * convFactor;
plFactor = 1.0f;
}
else
{
// For normal frames
int codedBlockSize = 64800;
int uncodedBlockSize;
int bbHeaderBits = 80;
// See table 5a in DVBS2 spec
switch (settings.m_fec)
{
case DATVModSettings::FEC12:
uncodedBlockSize = 32208;
break;
case DATVModSettings::FEC23:
uncodedBlockSize = 43040;
break;
case DATVModSettings::FEC34:
uncodedBlockSize = 48408;
break;
case DATVModSettings::FEC56:
uncodedBlockSize = 53840;
break;
case DATVModSettings::FEC45:
uncodedBlockSize = 51648;
break;
case DATVModSettings::FEC89:
uncodedBlockSize = 57472;
break;
case DATVModSettings::FEC910:
uncodedBlockSize = 58192;
break;
case DATVModSettings::FEC14:
uncodedBlockSize = 16008;
break;
case DATVModSettings::FEC13:
uncodedBlockSize = 21408;
break;
case DATVModSettings::FEC25:
uncodedBlockSize = 25728;
break;
case DATVModSettings::FEC35:
uncodedBlockSize = 38688;
break;
}
fecFactor = (uncodedBlockSize-bbHeaderBits)/(float)codedBlockSize;
float symbolsPerFrame = codedBlockSize/bitsPerSymbol;
// 90 symbols for PL header
plFactor = symbolsPerFrame / (symbolsPerFrame + 90.0f);
}
return std::round(settings.m_symbolRate * bitsPerSymbol * fecFactor * plFactor);
}
void DATVModSource::checkBitrates()
{
int dataBitrate = getDVBSDataBitrate(m_settings);
qDebug() << "MPEG-TS bitrate: " << m_mpegTSBitrate;
qDebug() << "DVB-S data bitrate: " << dataBitrate;
qDebug() << "DVB data bitrate: " << dataBitrate;
if (dataBitrate < m_mpegTSBitrate)
qWarning() << "DVB-S data bitrate is lower than the bitrate of the MPEG transport stream";
qWarning() << "DVB data bitrate is lower than the bitrate of the MPEG transport stream";
m_tsRatio = m_mpegTSBitrate/(float)dataBitrate;
}
@@ -316,6 +374,12 @@ void DATVModSource::modulateSample()
// Encode using DVB-S
m_symbolCount = m_dvbs.encode(m_mpegTS, m_iqSymbols);
}
else
{
// Encode using DVB-S2
m_symbolCount = m_dvbs2.s2_add_ts_frame((u8 *)m_mpegTS);
m_plFrame = m_dvbs2.pl_get_frame();
}
// Loop file if we reach the end
if ((m_frameIdx*DVBS::tsPacketLen >= m_mpegTSSize) && m_settings.m_tsFilePlayLoop)
@@ -372,9 +436,17 @@ void DATVModSource::modulateSample()
q = m_pulseShapeQ.filter(sin(5*M_PI/4));
}
*/
m_symbolIdx++;
m_symbolCount--;
}
else
{
// First 90 symbols of DVB-S2 are pi/2 BPSK, then remaining symbols are in specified modulation
i = m_pulseShapeI.filter(m_plFrame[m_symbolIdx].re/32767.0);
q = m_pulseShapeQ.filter(m_plFrame[m_symbolIdx].im/32767.0);
m_symbolIdx++;
m_symbolCount--;
}
m_symbolIdx++;
m_symbolCount--;
}
}
else
@@ -621,6 +693,77 @@ void DATVModSource::applySettings(const DATVModSettings& settings, bool force)
break;
}
}
else
{
m_dvbs2Format.frame_type = FRAME_NORMAL;
m_dvbs2Format.pilots = 0; // PILOTS_OFF;
m_dvbs2Format.dummy_frame = 0;
m_dvbs2Format.null_deletion = 0;
m_dvbs2Format.intface = M_ACM; // Unused?
m_dvbs2Format.broadcasting = 1;
switch (settings.m_modulation)
{
case DATVModSettings::QPSK:
m_dvbs2Format.constellation = M_QPSK;
break;
case DATVModSettings::PSK8:
m_dvbs2Format.constellation = M_8PSK;
break;
case DATVModSettings::APSK16:
m_dvbs2Format.constellation = M_16APSK;
break;
case DATVModSettings::APSK32:
m_dvbs2Format.constellation = M_32APSK;
break;
}
switch (settings.m_fec)
{
case DATVModSettings::FEC12:
m_dvbs2Format.code_rate = CR_1_2;
break;
case DATVModSettings::FEC23:
m_dvbs2Format.code_rate = CR_2_3;
break;
case DATVModSettings::FEC34:
m_dvbs2Format.code_rate = CR_3_4;
break;
case DATVModSettings::FEC56:
m_dvbs2Format.code_rate = CR_5_6;
break;
case DATVModSettings::FEC45:
m_dvbs2Format.code_rate = CR_4_5;
break;
case DATVModSettings::FEC89:
m_dvbs2Format.code_rate = CR_8_9;
break;
case DATVModSettings::FEC910:
m_dvbs2Format.code_rate = CR_9_10;
break;
case DATVModSettings::FEC14:
m_dvbs2Format.code_rate = CR_1_4;
break;
case DATVModSettings::FEC13:
m_dvbs2Format.code_rate = CR_1_3;
break;
case DATVModSettings::FEC25:
m_dvbs2Format.code_rate = CR_2_5;
break;
case DATVModSettings::FEC35:
m_dvbs2Format.code_rate = CR_3_5;
break;
}
if (settings.m_rollOff == 0.35f)
m_dvbs2Format.roll_off = RO_0_35;
else if (settings.m_rollOff == 0.25f)
m_dvbs2Format.roll_off = RO_0_25;
else
m_dvbs2Format.roll_off = RO_0_20;
m_dvbs2.s2_set_configure(&m_dvbs2Format);
}
if (getMessageQueueToGUI())
{
getMessageQueueToGUI()->push(DATVModReport::MsgReportRates::create(