RTP (Real-time Transport Protocol): GraphViz block diagram (.dot) source

The Real-time Transport Protocol (RTP) is a widely used network protocol for transmitting audio or video. It usually works with the RTP Control Protocol (RTCP). The transmission can be based on Transmission Control Protocol (TCP) or User Datagram Protocol (UDP).

KS implementation details

License: Unlicense

References

This page hosts a formal specification of RTP (Real-time Transport Protocol) using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.

GraphViz block diagram source

rtp_packet.dot

digraph {
	rankdir=LR;
	node [shape=plaintext];
	subgraph cluster__rtp_packet {
		label="RtpPacket";
		graph[style=dotted];

		rtp_packet__seq [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
			<TR><TD BGCOLOR="#E0FFE0">pos</TD><TD BGCOLOR="#E0FFE0">size</TD><TD BGCOLOR="#E0FFE0">type</TD><TD BGCOLOR="#E0FFE0">id</TD></TR>
			<TR><TD PORT="version_pos">0</TD><TD PORT="version_size">2b</TD><TD>b2</TD><TD PORT="version_type">version</TD></TR>
			<TR><TD PORT="has_padding_pos">0:2</TD><TD PORT="has_padding_size">1b</TD><TD>BitsType1</TD><TD PORT="has_padding_type">has_padding</TD></TR>
			<TR><TD PORT="has_extension_pos">0:3</TD><TD PORT="has_extension_size">1b</TD><TD>BitsType1</TD><TD PORT="has_extension_type">has_extension</TD></TR>
			<TR><TD PORT="csrc_count_pos">0:4</TD><TD PORT="csrc_count_size">4b</TD><TD>b4</TD><TD PORT="csrc_count_type">csrc_count</TD></TR>
			<TR><TD PORT="marker_pos">1</TD><TD PORT="marker_size">1b</TD><TD>BitsType1</TD><TD PORT="marker_type">marker</TD></TR>
			<TR><TD PORT="payload_type_pos">1:1</TD><TD PORT="payload_type_size">7b</TD><TD>b7→PayloadTypeEnum</TD><TD PORT="payload_type_type">payload_type</TD></TR>
			<TR><TD PORT="sequence_number_pos">2</TD><TD PORT="sequence_number_size">2</TD><TD>u2be</TD><TD PORT="sequence_number_type">sequence_number</TD></TR>
			<TR><TD PORT="timestamp_pos">4</TD><TD PORT="timestamp_size">4</TD><TD>u4be</TD><TD PORT="timestamp_type">timestamp</TD></TR>
			<TR><TD PORT="ssrc_pos">8</TD><TD PORT="ssrc_size">4</TD><TD>u4be</TD><TD PORT="ssrc_type">ssrc</TD></TR>
			<TR><TD PORT="header_extension_pos">12</TD><TD PORT="header_extension_size">4</TD><TD>HeaderExtention</TD><TD PORT="header_extension_type">header_extension</TD></TR>
			<TR><TD PORT="data_pos">16</TD><TD PORT="data_size">((_io.size - _io.pos) - len_padding)</TD><TD></TD><TD PORT="data_type">data</TD></TR>
			<TR><TD PORT="padding_pos">...</TD><TD PORT="padding_size">len_padding</TD><TD></TD><TD PORT="padding_type">padding</TD></TR>
		</TABLE>>];
		rtp_packet__inst__len_padding_if_exists [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
			<TR><TD BGCOLOR="#E0FFE0">pos</TD><TD BGCOLOR="#E0FFE0">size</TD><TD BGCOLOR="#E0FFE0">type</TD><TD BGCOLOR="#E0FFE0">id</TD></TR>
			<TR><TD PORT="len_padding_if_exists_pos">(_io.size - 1)</TD><TD PORT="len_padding_if_exists_size">1</TD><TD>u1</TD><TD PORT="len_padding_if_exists_type">len_padding_if_exists</TD></TR>
		</TABLE>>];
		rtp_packet__inst__len_padding [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
			<TR><TD BGCOLOR="#E0FFE0">id</TD><TD BGCOLOR="#E0FFE0">value</TD></TR>
			<TR><TD>len_padding</TD><TD>(has_padding ? len_padding_if_exists : 0)</TD></TR>
		</TABLE>>];
		subgraph cluster__header_extention {
			label="RtpPacket::HeaderExtention";
			graph[style=dotted];

			header_extention__seq [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">pos</TD><TD BGCOLOR="#E0FFE0">size</TD><TD BGCOLOR="#E0FFE0">type</TD><TD BGCOLOR="#E0FFE0">id</TD></TR>
				<TR><TD PORT="id_pos">0</TD><TD PORT="id_size">2</TD><TD>u2be</TD><TD PORT="id_type">id</TD></TR>
				<TR><TD PORT="length_pos">2</TD><TD PORT="length_size">2</TD><TD>u2be</TD><TD PORT="length_type">length</TD></TR>
			</TABLE>>];
		}
	}
	rtp_packet__seq:header_extension_type -> header_extention__seq [style=bold];
	rtp_packet__inst__len_padding:len_padding_type -> rtp_packet__seq:data_size [color="#404040"];
	rtp_packet__inst__len_padding:len_padding_type -> rtp_packet__seq:padding_size [color="#404040"];
	rtp_packet__seq:has_padding_type -> rtp_packet__inst__len_padding [color="#404040"];
	rtp_packet__inst__len_padding_if_exists:len_padding_if_exists_type -> rtp_packet__inst__len_padding [color="#404040"];
}