Module rtp 

Router-native RTP model for the transport edge.

This module defines the typed domain model used to describe media streams, codecs, and their negotiated properties. It sits between the signaling/SDP layer and the raw packet loop, allowing the router to reason about media without parsing raw bytes or string-heavy protocol bags.

RTP Packet Context

Most of the types defined here map directly to fields in the “RFC 3550” RTP header or its extensions:

 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|V=2|P|X|  CC   |M|     PT      |       Sequence Number         |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                           Timestamp                           |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|           Synchronization Source (SSRC) identifier            |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

• V: version (always 2)
• P: padding bit
• X: extension bit (if set, an extension header follows the SSRC)
• CC: “CSRC count”, the number of contributing source identifiers (0-15) that follow the SSRC
• M: “Marker” bit, used by profiles to mark significant events like the end of a video frame
• PT: “Payload Type” (identifies the codec)
• SSRC: unique stream identifier

RFC references for this module:

• RTP base protocol: https://www.rfc-editor.org/rfc/rfc3550
• RTP A/V profile payload assignments: https://www.rfc-editor.org/rfc/rfc3551
• RTP header extension framework: https://www.rfc-editor.org/rfc/rfc8285

Structs

HeaderExtension

RTP header-extension configuration (RFC 8285).

HeaderExtensionId

Local 4-bit identifier for a header extension (RFC 8285).

MediaCapabilities

Full set of codec and extension capabilities for an RTP endpoint.

MediaCodecCapability

Codec capability advertised by a router or endpoint.

MediaFormat

Negotiated codec format for a concrete media stream.

MediaStream

Description of one logical media stream (e.g. “camera”) at the router boundary.

Mid

Media identification (RFC 9143).

PayloadType

7-bit RTP payload type value usable in RTP/RTCP muxed sessions

Rid

Restriction identifier (RFC 8851).

RtcpFeedback

One negotiated RTCP feedback mechanism for a codec.

Ssrc

Synchronization source identifier for a media stream (RFC 3550).

StreamBinding

Routing bridge between a negotiated media format and a physical stream.

Enums

CodecSetting

Typed codec parameter that affects interoperability.

RtcpFeedbackKind

Categories of feedback messages sent over RTCP to control stream behavior.

Functions

codec_setting_from_wire 🔒

Type Aliases

HeaderExtensionUri

Uniform resource identifier for a header extension (e.g. “urn:ietf:params:rtp-hdrext:ssrc-audio-level”)

MediaCodec

Canonical name for a media codec (e.g. “opus”, “vp8”, “h264”)