public static RTPPacket BuildPacket(byte[] bRecvData, int nOffset, int nLength)
{
RTPPacket packet = new RTPPacket();
if (nLength < 12)
return null;
byte[] bRTPData = new byte[nLength];
Array.Copy(bRecvData, nOffset, bRTPData, 0, nLength);
packet.VersionPaddingHeaderCRSCCountByte = bRTPData[0];
packet.MarkerPayloadByte = bRTPData[1];
packet.SequenceNumber = (ushort)((bRTPData[2] << 8) | bRTPData[3]);
packet.TimeStamp = (uint)((bRTPData[4] << 24) | (bRTPData[5] << 16) | (bRTPData[6] << 8) | (bRTPData[7]));
packet.SSRC = (uint)((bRTPData[8] << 24) | (bRTPData[9] << 16) | (bRTPData[10] << 8) | (bRTPData[11]));
int nByteAt = 12;
for (int i = 0; i < packet.CRSCCount; i++)
{
if (bRTPData.Length < (nByteAt + 4))
return null;
packet.CSRCList.Add((uint)((bRTPData[nByteAt++] << 24) | (bRTPData[nByteAt++] << 16) | (bRTPData[nByteAt++] << 8) | (bRTPData[nByteAt++])));
}
int nExtensionLen = 0;
/// Read in extension data, if there
if (packet.Extension == true)
{
/// ignore this for now, just copy to the data
//nExtensionLen = pRTPHeader.
}
int nDataStartAt = 12 + 4 * packet.CRSCCount + nExtensionLen;
int nBytesLeft = bRTPData.Length - nDataStartAt;
/// Finally, let's find out what is next and add that as data
if (nBytesLeft > 0)
{
packet.PayloadData = new byte[nBytesLeft];
Array.Copy(bRTPData, nDataStartAt, packet.PayloadData, 0, nBytesLeft);
}
return packet;
}