public void BuildPacket(byte[] buffer)
{
Debug.Assert(_outputBuffer.CurPacketSize() == 0);
// Set up the RTP header:
uint rtpHdr = 0x80000000; // RTP version 2; marker ('M') bit not set (by default; it can be set later)
rtpHdr |= (uint)(_rtPayloadType << 16);
rtpHdr |= _sequenceNumber; // sequence number
_outputBuffer.WriteWord(rtpHdr);
// Note where the RTP timestamp will go.
// (We can't fill this in until we start packing payload frames.)
_timestampPosition = (int)_outputBuffer.CurPacketSize();
_outputBuffer.SkipBytes(4); // leave a hole for the timestamp
_outputBuffer.WriteWord(SSRC());
// Allow for a special, payload-format-specific header following the
// RTP header:
_specialHeaderPosition = (int)_outputBuffer.CurPacketSize();
_specialHeaderSize = specialHeaderSize();
_outputBuffer.SkipBytes(_specialHeaderSize);
// First, skip over the space we'll use for any frame-specific header:
_curFrameSpecificHeaderPosition = (int)_outputBuffer.CurPacketSize();
_curFrameSpecificHeaderSize = frameSpecificHeaderSize();
_outputBuffer.SkipBytes(_curFrameSpecificHeaderSize);
_totalFrameSpecificHeaderSizes += _curFrameSpecificHeaderSize;
// Then add the payload
_outputBuffer.AddBuffer(buffer);
}