/// <summary>
/// Gets the byte section of the table.
/// </summary>
/// <param name="packet">The starting packet for the table.</param>
/// <param name="tableId">TableId</param>
/// <returns>Section of bytes.</returns>
private byte[] GetEntireTable(TSPacketInfo packet, int tableId)
{
Ensure.IsNotNull(Log, packet, "packet is null");
if (!packet.PayloadUnitStartIndicator || !packet.HasPayload)
{
//throw new CustomException("The packet doesn't contain a table section.");
return(null);
}
var pointerField = packet.GetDataByte(0);
if (pointerField != 0)
{
//Ensure.IsZero(Log, pointerField, "pointer field must be zero.");
return(null);
}
// TODO: move to PATSection
var pTableId = packet.GetDataByte(1);
if (tableId != pTableId)
{
//Ensure.AreEqual(Log, tableId, pTableId, "TableId is invalid.");
return(null);
}
var sectionSyntaxIndicator = BinaryUtils.ReadBool(packet.GetDataByte(2), 0);
if (!sectionSyntaxIndicator)
{
//Ensure.IsTrue(Log, sectionSyntaxIndicator, "sectionSyntaxIndicator is not true.");
return(null);
}
var padding = BinaryUtils.ReadBool(packet.GetDataByte(2), 1);
if (padding)
{
//Ensure.IsFalse(Log, padding, "padding is not false.");
return(null);
}
var reserved = BinaryUtils.GetBits(packet.GetDataByte(2), 2, 2);
if (reserved != 3)
{
//Ensure.AreEqual(Log, 3, reserved, "reserved is not 11b (3).");
return(null);
}
var sectionLen = BinaryUtils.GetBitsEx(packet.Segment, packet.DataBytePos + 2, 4, 12);
sectionLen = Math.Min(4096, sectionLen) - (Constants.TSPacketSize - packet.DataBytePos - 3); // TODO: Review.
var sectionData = new byte[4096];
var sectionOffset = 0;
Buffer.BlockCopy(packet.Segment.Array, packet.Segment.Offset, sectionData, sectionOffset, packet.Segment.Count);
sectionOffset += packet.Segment.Count;
while (sectionLen > 0)
{
var nextPacket = this.GetPacket();
if (nextPacket == null)
{
continue;
}
if (!nextPacket.PayloadUnitStartIndicator &&
nextPacket.AdaptationFieldControl == AdaptationType.Payload &&
nextPacket.PID == packet.PID)
{
var len = nextPacket.Segment.Count - 4;
Buffer.BlockCopy(nextPacket.Segment.Array, nextPacket.Segment.Offset + 4, sectionData, sectionOffset, len);
sectionOffset += len;
sectionLen -= len;
}
}
return(sectionData);
}
/// <summary>
/// Parse stream and search for A / V types.
/// </summary>
private void ParseStream()
{
subStreams.Clear();
#region Looking for PAT
var count = 0;
var packet = GetPacket();
while (packet == null || packet.PID != 0)
{
packet = GetPacket();
count++;
if (count > 4000)
{
throw new CustomException("PAT is not found.");
}
}
#endregion
#region Parse PAT (Program Association Table)
var table = GetEntireTable(packet, 0x00);
if (table == null)
{
throw new CustomException("PAT is not parsed");
}
var pTable = new TSPacketInfo(table);
var sectionLen = BinaryUtils.GetBitsEx(pTable.Segment, pTable.DataBytePos + 2, 4, 12);
//var transportStreamId = BinaryUtils.GetBitsEx(pTable.Bytes, pTable.DataBytePos + 4, 0, 16);
//var patVersion = BinaryUtils.GetBitsEx(pTable.Bytes, pTable.DataBytePos + 6, 2, 5);
var infoLen = sectionLen - 5 - 4;
var numOfId = infoLen / 4;
var programs = new List<Tuple<long, long>>();
for (var i = 0; i < numOfId; i++)
{
var progNum = BinaryUtils.GetBitsEx(pTable.Segment, pTable.DataBytePos + 9 + 4 * i, 0, 16);
var pid = BinaryUtils.GetBitsEx(pTable.Segment, pTable.DataBytePos + 11 + 4 * i, 3, 13);
if (progNum == 0)
{
//var networkId = pid;
}
else
{
programs.Add(new Tuple<long, long>(progNum, pid));
}
}
#endregion
#region Parse PMT (Program Map Table)
Ensure.IsNotZero(Log, programs.Count, "No programs are found");
count = 0;
//var list = new List<int>();
byte[] pmtTable;
while (true)
{
#region GUARD (COUNT)
count++;
if (count > 20000)
{
//break;
throw new CustomException("PMT is not found.");
}
#endregion
#region SEARCH PMT
var nextPacket = this.GetPacket();
if (nextPacket == null)
{
continue;
}
pmtTable = this.GetEntireTable(nextPacket, 0x02);
if (pmtTable == null)
{
continue;
}
//list.Add(nextPacket.PID);
//continue;
#endregion
#region CHECK PROGRAMS
var found = false;
foreach (var prog in programs)
{
if (prog.Second == nextPacket.PID)
{
found = true;
break;
}
}
if (found)
{
break;
}
#endregion
}
#endregion
var pmtPacket = new TSPacketInfo(pmtTable);
sectionLen = BinaryUtils.GetBitsEx(pmtPacket.Segment, pmtPacket.DataBytePos + 2, 4, 12);
var programInfoLen = BinaryUtils.GetBitsEx(pmtPacket.Segment, pmtPacket.DataBytePos + 11, 4, 12);
var pmtInfoLen = sectionLen - 13 - programInfoLen;
var pmtStartPos = Convert.ToInt32(pmtPacket.DataBytePos + 13 + programInfoLen);
while (pmtInfoLen > 0)
{
var streamType = BinaryUtils.GetBitsEx(pmtPacket.Segment, pmtStartPos, 0, 8);
var ePID = Convert.ToInt32(BinaryUtils.GetBitsEx(pmtPacket.Segment, pmtStartPos + 1, 3, 13));
var eLen = Convert.ToInt32(BinaryUtils.GetBitsEx(pmtPacket.Segment, pmtStartPos + 3, 4, 12));
SubStreamType subStreamType = SubStreamType.None;
switch (streamType)
{
case 0x02:
subStreamType = SubStreamType.VideoMP2;
break;
case 0x03:
case 0x04:
subStreamType = SubStreamType.AudioMP2;
break;
case 0x06:
// DTS checking
if (CheckDescriptorES(pmtPacket.Segment, pmtStartPos + 5, eLen, 0x73))
{
subStreamType = SubStreamType.AudioDTS;
}
// Subtitle checking
else if (CheckDescriptorES(pmtPacket.Segment, pmtStartPos + 5, eLen, 0x59))
{
subStreamType = SubStreamType.Subtitle;
}
// AC3 checking
else if (CheckDescriptorES(pmtPacket.Segment, pmtStartPos + 5, eLen, 0x6a))
{
subStreamType = SubStreamType.AudioAC3;
}
// Teletext checking
else if (CheckDescriptorES(pmtPacket.Segment, pmtStartPos + 5, eLen, 0x56))
{
subStreamType = SubStreamType.Teletext;
}
break;
case 0x0B:
subStreamType = SubStreamType.Subtitle;
break;
case 0x0F:
case 0x11:
subStreamType = SubStreamType.AudioAAC;
break;
case 0x10:
subStreamType = SubStreamType.VideoMP4;
break;
case 0x1b:
subStreamType = SubStreamType.VideoH264;
break;
case 0x81:
case 0x83:
case 0x85:
case 0x8A:
subStreamType = SubStreamType.AudioAC3;
break;
}
subStreams.Add(new Tuple<int, SubStreamType>(ePID, subStreamType));
pmtInfoLen -= (eLen + 5);
pmtStartPos += (eLen + 5);
}
}
/// <summary>
/// Parse stream and search for A / V types.
/// </summary>
private void ParseStream()
{
subStreams.Clear();
#region Looking for PAT
var count = 0;
var packet = GetPacket();
while (packet == null || packet.PID != 0)
{
packet = GetPacket();
count++;
if (count > 4000)
{
throw new CustomException("PAT is not found.");
}
}
#endregion
#region Parse PAT (Program Association Table)
var table = GetEntireTable(packet, 0x00);
if (table == null)
{
throw new CustomException("PAT is not parsed");
}
var pTable = new TSPacketInfo(table);
var sectionLen = BinaryUtils.GetBitsEx(pTable.Segment, pTable.DataBytePos + 2, 4, 12);
//var transportStreamId = BinaryUtils.GetBitsEx(pTable.Bytes, pTable.DataBytePos + 4, 0, 16);
//var patVersion = BinaryUtils.GetBitsEx(pTable.Bytes, pTable.DataBytePos + 6, 2, 5);
var infoLen = sectionLen - 5 - 4;
var numOfId = infoLen / 4;
var programs = new List <Tuple <long, long> >();
for (var i = 0; i < numOfId; i++)
{
var progNum = BinaryUtils.GetBitsEx(pTable.Segment, pTable.DataBytePos + 9 + 4 * i, 0, 16);
var pid = BinaryUtils.GetBitsEx(pTable.Segment, pTable.DataBytePos + 11 + 4 * i, 3, 13);
if (progNum == 0)
{
//var networkId = pid;
}
else
{
programs.Add(new Tuple <long, long>(progNum, pid));
}
}
#endregion
#region Parse PMT (Program Map Table)
Ensure.IsNotZero(Log, programs.Count, "No programs are found");
count = 0;
//var list = new List<int>();
byte[] pmtTable;
while (true)
{
#region GUARD (COUNT)
count++;
if (count > 20000)
{
//break;
throw new CustomException("PMT is not found.");
}
#endregion
#region SEARCH PMT
var nextPacket = this.GetPacket();
if (nextPacket == null)
{
continue;
}
pmtTable = this.GetEntireTable(nextPacket, 0x02);
if (pmtTable == null)
{
continue;
}
//list.Add(nextPacket.PID);
//continue;
#endregion
#region CHECK PROGRAMS
var found = false;
foreach (var prog in programs)
{
if (prog.Second == nextPacket.PID)
{
found = true;
break;
}
}
if (found)
{
break;
}
#endregion
}
#endregion
var pmtPacket = new TSPacketInfo(pmtTable);
sectionLen = BinaryUtils.GetBitsEx(pmtPacket.Segment, pmtPacket.DataBytePos + 2, 4, 12);
var programInfoLen = BinaryUtils.GetBitsEx(pmtPacket.Segment, pmtPacket.DataBytePos + 11, 4, 12);
var pmtInfoLen = sectionLen - 13 - programInfoLen;
var pmtStartPos = Convert.ToInt32(pmtPacket.DataBytePos + 13 + programInfoLen);
while (pmtInfoLen > 0)
{
var streamType = BinaryUtils.GetBitsEx(pmtPacket.Segment, pmtStartPos, 0, 8);
var ePID = Convert.ToInt32(BinaryUtils.GetBitsEx(pmtPacket.Segment, pmtStartPos + 1, 3, 13));
var eLen = Convert.ToInt32(BinaryUtils.GetBitsEx(pmtPacket.Segment, pmtStartPos + 3, 4, 12));
SubStreamType subStreamType = SubStreamType.None;
switch (streamType)
{
case 0x02:
subStreamType = SubStreamType.VideoMP2;
break;
case 0x03:
case 0x04:
subStreamType = SubStreamType.AudioMP2;
break;
case 0x06:
// DTS checking
if (CheckDescriptorES(pmtPacket.Segment, pmtStartPos + 5, eLen, 0x73))
{
subStreamType = SubStreamType.AudioDTS;
}
// Subtitle checking
else if (CheckDescriptorES(pmtPacket.Segment, pmtStartPos + 5, eLen, 0x59))
{
subStreamType = SubStreamType.Subtitle;
}
// AC3 checking
else if (CheckDescriptorES(pmtPacket.Segment, pmtStartPos + 5, eLen, 0x6a))
{
subStreamType = SubStreamType.AudioAC3;
}
// Teletext checking
else if (CheckDescriptorES(pmtPacket.Segment, pmtStartPos + 5, eLen, 0x56))
{
subStreamType = SubStreamType.Teletext;
}
break;
case 0x0B:
subStreamType = SubStreamType.Subtitle;
break;
case 0x0F:
case 0x11:
subStreamType = SubStreamType.AudioAAC;
break;
case 0x10:
subStreamType = SubStreamType.VideoMP4;
break;
case 0x1b:
subStreamType = SubStreamType.VideoH264;
break;
case 0x81:
case 0x83:
case 0x85:
case 0x8A:
subStreamType = SubStreamType.AudioAC3;
break;
}
subStreams.Add(new Tuple <int, SubStreamType>(ePID, subStreamType));
pmtInfoLen -= (eLen + 5);
pmtStartPos += (eLen + 5);
}
}
/// <summary>
/// Gets the byte section of the table.
/// </summary>
/// <param name="packet">The starting packet for the table.</param>
/// <param name="tableId">TableId</param>
/// <returns>Section of bytes.</returns>
private byte[] GetEntireTable(TSPacketInfo packet, int tableId)
{
Ensure.IsNotNull(Log, packet, "packet is null");
if (!packet.PayloadUnitStartIndicator || !packet.HasPayload)
{
//throw new CustomException("The packet doesn't contain a table section.");
return null;
}
var pointerField = packet.GetDataByte(0);
if (pointerField != 0)
{
//Ensure.IsZero(Log, pointerField, "pointer field must be zero.");
return null;
}
// TODO: move to PATSection
var pTableId = packet.GetDataByte(1);
if (tableId != pTableId)
{
//Ensure.AreEqual(Log, tableId, pTableId, "TableId is invalid.");
return null;
}
var sectionSyntaxIndicator = BinaryUtils.ReadBool(packet.GetDataByte(2), 0);
if (!sectionSyntaxIndicator)
{
//Ensure.IsTrue(Log, sectionSyntaxIndicator, "sectionSyntaxIndicator is not true.");
return null;
}
var padding = BinaryUtils.ReadBool(packet.GetDataByte(2), 1);
if (padding)
{
//Ensure.IsFalse(Log, padding, "padding is not false.");
return null;
}
var reserved = BinaryUtils.GetBits(packet.GetDataByte(2), 2, 2);
if (reserved != 3)
{
//Ensure.AreEqual(Log, 3, reserved, "reserved is not 11b (3).");
return null;
}
var sectionLen = BinaryUtils.GetBitsEx(packet.Segment, packet.DataBytePos + 2, 4, 12);
sectionLen = Math.Min(4096, sectionLen) - (Constants.TSPacketSize - packet.DataBytePos - 3); // TODO: Review.
var sectionData = new byte[4096];
var sectionOffset = 0;
Buffer.BlockCopy(packet.Segment.Array, packet.Segment.Offset, sectionData, sectionOffset, packet.Segment.Count);
sectionOffset += packet.Segment.Count;
while (sectionLen > 0)
{
var nextPacket = this.GetPacket();
if (nextPacket == null)
{
continue;
}
if (!nextPacket.PayloadUnitStartIndicator &&
nextPacket.AdaptationFieldControl == AdaptationType.Payload &&
nextPacket.PID == packet.PID)
{
var len = nextPacket.Segment.Count - 4;
Buffer.BlockCopy(nextPacket.Segment.Array, nextPacket.Segment.Offset + 4, sectionData, sectionOffset, len);
sectionOffset += len;
sectionLen -= len;
}
}
return sectionData;
}