public void Decode(byte[] section)
{
if (OnTableComplete == null)
{
return;
}
if (section.Length < 14)
{
Log.Log.Error("NTT: invalid section size {0}, expected at least 14 bytes", section.Length);
return;
}
byte tableId = section[2];
if (tableId != 0xc3)
{
return;
}
int sectionLength = ((section[3] & 0x0f) << 8) + section[4];
if (section.Length != 2 + sectionLength + 3) // 2 for section length bytes, 3 for table ID and PID
{
Log.Log.Error("NTT: invalid section length = {0}, byte count = {1}", sectionLength, section.Length);
return;
}
int protocolVersion = (section[5] & 0x1f);
string isoLangCode = System.Text.Encoding.ASCII.GetString(section, 6, 3);
AtscTransmissionMedium transmissionMedium = (AtscTransmissionMedium)(section[9] >> 4);
TableSubtype tableSubtype = (TableSubtype)(section[9] & 0x0f);
Log.Log.Debug("NTT: section length = {0}, protocol version = {1}, ISO language code = {2}, transmission medium = {3}, table subtype = {4}",
sectionLength, protocolVersion, isoLangCode, transmissionMedium, tableSubtype);
int pointer = 10;
int endOfSection = section.Length - 4;
try
{
switch (tableSubtype)
{
case TableSubtype.TransponderName:
DecodeTransponderName(section, endOfSection, ref pointer);
break;
case TableSubtype.SatelliteText:
DecodeSatelliteText(section, endOfSection, ref pointer);
break;
case TableSubtype.RatingsText:
DecodeRatingsText(section, endOfSection, ref pointer);
break;
case TableSubtype.RatingSystem:
DecodeRatingSystem(section, endOfSection, ref pointer);
break;
case TableSubtype.CurrencySystem:
DecodeCurrencySystem(section, endOfSection, ref pointer);
break;
case TableSubtype.SourceName:
DecodeSourceName(section, endOfSection, ref pointer, transmissionMedium);
break;
case TableSubtype.MapName:
DecodeMapName(section, endOfSection, ref pointer);
break;
default:
Log.Log.Error("NTT: unsupported table subtype {0}", tableSubtype);
return;
}
}
catch (Exception ex)
{
Log.Log.Error(ex.Message);
return;
}
while (pointer + 1 < endOfSection)
{
byte tag = section[pointer++];
byte length = section[pointer++];
Log.Log.Debug("NTT: descriptor, tag = 0x{0:x}, length = {1}", tag, length);
if (pointer + length > endOfSection)
{
Log.Log.Error("NTT: invalid descriptor length {0}, pointer = {1}, end of section = {2}", length, pointer, endOfSection);
return;
}
if (tag == 0x93) // revision detection descriptor
{
DecodeRevisionDetectionDescriptor(section, pointer, length, (int)tableSubtype);
}
pointer += length;
}
if (pointer != endOfSection)
{
Log.Log.Error("NTT: corruption detected at end of section, pointer = {0}, end of section = {1}", pointer, endOfSection);
return;
}
if (tableSubtype == TableSubtype.SourceName &&
_currentVersions[(int)TableSubtype.SourceName] != -1 &&
_unseenSections[(int)TableSubtype.SourceName].Count == 0 &&
OnTableComplete != null)
{
OnTableComplete(MgtTableType.NttSns);
OnTableComplete = null;
OnSourceName = null;
}
}
public void Decode(byte[] section)
{
if (OnTableComplete == null)
{
return;
}
if (section.Length < 13)
{
Log.Log.Error("NIT: invalid section size {0}, expected at least 13 bytes", section.Length);
return;
}
byte tableId = section[2];
if (tableId != 0xc2)
{
return;
}
int sectionLength = ((section[3] & 0xf) << 8) + section[4];
if (section.Length != 2 + sectionLength + 3) // 2 for section length bytes, 3 for table ID and PID
{
Log.Log.Error("NIT: invalid section length = {0}, byte count = {1}", sectionLength, section.Length);
return;
}
int protocolVersion = (section[5] & 0x1f);
byte firstIndex = section[6];
byte numberOfRecords = section[7];
AtscTransmissionMedium transmissionMedium = (AtscTransmissionMedium)(section[8] >> 4);
TableSubtype tableSubtype = (TableSubtype)(section[8] & 0x0f);
if ((tableSubtype != TableSubtype.CarrierDefinition || OnCarrierDefinition == null) &&
(tableSubtype != TableSubtype.ModulationMode || OnModulationMode == null))
{
return;
}
int pointer = 9;
int endOfSection = section.Length - 4;
byte satelliteId = 0;
if (tableSubtype == TableSubtype.TransponderData)
{
if (pointer >= endOfSection)
{
Log.Log.Error("NIT: invalid section length at satellite ID, pointer = {0}, end of section = {1}", pointer, endOfSection);
return;
}
satelliteId = section[pointer++];
}
Log.Log.Debug("NIT: section length = {0}, protocol version = {1}, first index = {2}, number of records = {3}, transmission medium = {4}, table subtype = {5}, satellite ID = {6}",
sectionLength, protocolVersion, firstIndex, numberOfRecords, transmissionMedium, tableSubtype, satelliteId);
for (byte i = 0; i < numberOfRecords; i++)
{
try
{
switch (tableSubtype)
{
case TableSubtype.CarrierDefinition:
DecodeCarrierDefinition(section, endOfSection, ref pointer, ref firstIndex, transmissionMedium);
break;
case TableSubtype.ModulationMode:
DecodeModulationMode(section, endOfSection, ref pointer, ref firstIndex, transmissionMedium);
break;
case TableSubtype.SatelliteInformation:
DecodeSatelliteInformation(section, endOfSection, ref pointer);
break;
case TableSubtype.TransponderData:
DecodeTransponderData(section, endOfSection, ref pointer);
break;
default:
Log.Log.Error("NIT: unsupported table subtype {0}", tableSubtype);
return;
}
}
catch (Exception ex)
{
Log.Log.Error(ex.Message);
return;
}
// table descriptors
if (pointer >= endOfSection)
{
Log.Log.Error("NIT: invalid section length at table descriptor count, pointer = {0}, end of section = {1}, loop = {2}", pointer, endOfSection, i);
return;
}
byte descriptorCount = section[pointer++];
for (byte d = 0; d < descriptorCount; d++)
{
if (pointer + 2 > endOfSection)
{
Log.Log.Error("NIT: detected table descriptor count {0} is invalid, pointer = {1}, end of section = {2}, loop = {3}, inner loop = {4}", descriptorCount, pointer, endOfSection, i, d);
return;
}
byte tag = section[pointer++];
byte length = section[pointer++];
Log.Log.Debug("NIT: table descriptor, tag = 0x{0:x}, length = {1}", tag, length);
if (pointer + length > endOfSection)
{
Log.Log.Error("NIT: invalid table descriptor length {0}, pointer = {1}, end of section = {2}, loop = {3}, inner loop = {4}", length, pointer, endOfSection, i, d);
return;
}
pointer += length;
}
}
while (pointer + 1 < endOfSection)
{
byte tag = section[pointer++];
byte length = section[pointer++];
Log.Log.Debug("NIT: descriptor, tag = 0x{0:x}, length = {1}", tag, length);
if (pointer + length > endOfSection)
{
Log.Log.Error("NIT: invalid descriptor length {0}, pointer = {1}, end of section = {2}", length, pointer, endOfSection);
return;
}
if (tag == 0x93)
{
DecodeRevisionDetectionDescriptor(section, pointer, length, (int)tableSubtype);
}
pointer += length;
}
if (pointer != endOfSection)
{
Log.Log.Error("NIT: corruption detected at end of section, pointer = {0}, end of section = {1}", pointer, endOfSection);
return;
}
if (tableSubtype == TableSubtype.CarrierDefinition &&
(
_currentVersions[(int)TableSubtype.CarrierDefinition] == -1 ||
_unseenSections[(int)TableSubtype.CarrierDefinition].Count == 0
) &&
OnCarrierDefinition != null)
{
OnCarrierDefinition = null;
if (OnModulationMode == null && OnTableComplete != null)
{
OnTableComplete(MgtTableType.NitCds);
OnTableComplete = null;
}
}
else if (tableSubtype == TableSubtype.ModulationMode &&
(
_currentVersions[(int)TableSubtype.ModulationMode] == -1 ||
_unseenSections[(int)TableSubtype.ModulationMode].Count == 0
) &&
OnModulationMode != null)
{
OnModulationMode = null;
if (OnCarrierDefinition == null && OnTableComplete != null)
{
OnTableComplete(MgtTableType.NitMms);
OnTableComplete = null;
}
}
}
public void Decode(byte[] section)
{
if (OnTableComplete == null)
{
return;
}
if (section.Length < 13)
{
Log.Log.Error("S-VCT: invalid section size {0}, expected at least 13 bytes", section.Length);
return;
}
byte tableId = section[2];
if (tableId != 0xc4)
{
return;
}
int sectionLength = ((section[3] & 0x0f) << 8) + section[4];
if (section.Length != 2 + sectionLength + 3) // 2 for section length bytes, 3 for table ID and PID
{
Log.Log.Error("S-VCT: invalid section length = {0}, byte count = {1}", sectionLength, section.Length);
return;
}
byte protocolVersion = (byte)(section[5] & 0x1f);
AtscTransmissionMedium transmissionMedium = (AtscTransmissionMedium)(section[6] >> 4);
TableSubtype tableSubtype = (TableSubtype)(section[6] & 0x0f);
int vctId = (section[7] << 8) + section[8];
Log.Log.Debug("S-VCT: section length = {0}, protocol version = {1}, transmission medium = {2}, table subtype = {3}, VCT ID = 0x{4:x}",
sectionLength, protocolVersion, transmissionMedium, tableSubtype, vctId);
int pointer = 9;
int endOfSection = section.Length - 4;
try
{
switch (tableSubtype)
{
case TableSubtype.DefinedChannelMap:
DecodeDefinedChannelMap(section, endOfSection, ref pointer);
break;
case TableSubtype.VirtualChannelMap:
DecodeVirtualChannelMap(section, endOfSection, ref pointer, transmissionMedium, vctId);
break;
case TableSubtype.InverseChannelMap:
DecodeInverseChannelMap(section, endOfSection, ref pointer);
break;
default:
Log.Log.Error("S-VCT: unsupported table subtype {0}", tableSubtype);
return;
}
}
catch (Exception ex)
{
Log.Log.Error(ex.Message);
return;
}
while (pointer + 1 < endOfSection)
{
byte tag = section[pointer++];
byte length = section[pointer++];
Log.Log.Debug("S-VCT: descriptor, tag = 0x{0:x}, length = {1}", tag, length);
if (pointer + length > endOfSection)
{
Log.Log.Error("S-VCT: invalid descriptor length {0}, pointer = {1}, end of section = {2}", length, pointer, endOfSection);
return;
}
if (tag == 0x93) // revision detection descriptor
{
DecodeRevisionDetectionDescriptor(section, pointer, length, (int)tableSubtype);
}
pointer += length;
}
if (pointer != endOfSection)
{
Log.Log.Error("S-VCT: corruption detected at end of section, pointer = {0}, end of section = {1}", pointer, endOfSection);
return;
}
// Two methods for detecting S-VCT VCM completion:
// 1. Revision detection descriptors.
// 2. DCM channel count equals VCM channel count.
if (
(
tableSubtype == TableSubtype.VirtualChannelMap &&
_currentVersions[(int)TableSubtype.VirtualChannelMap] != -1 &&
_unseenSections[(int)TableSubtype.VirtualChannelMap].Count == 0 &&
OnTableComplete != null
) ||
(
(tableSubtype == TableSubtype.DefinedChannelMap || tableSubtype == TableSubtype.VirtualChannelMap) &&
_currentVersions[(int)TableSubtype.VirtualChannelMap] == -1 &&
_channelDefinitions.Count == _definedChannels.Count &&
OnTableComplete != null
)
)
{
OnTableComplete(MgtTableType.SvctVcm);
OnTableComplete = null;
OnChannelDetail = null;
}
}
