Module extmap 

a=extmap RTP header-extension declarations and the well-known extension URIs. a=extmap RTP header-extension declarations.

An ExtMap binds a header-extension URI to the small integer id that will appear in RTP packets. Both sides must agree, which is the whole point of negotiating it in SDP: the id is per-session, while the URI is the stable name.

The *_URI constants are the extensions this stack uses — audio level, video orientation, absolute send time, transport-wide CC, and the SDES ids that make simulcast demultiplexing possible.

Structs

ExtMap

ExtMap represents the activation of a single RTP header extension

Constants

ABS_SEND_TIME_URI

The absolute-send-time extension URI, used for bandwidth estimation.

AUDIO_LEVEL_URI

The audio-level extension URI, carrying per-packet loudness.

DEF_EXT_MAP_VALUE_ABS_SEND_TIME

Default ext values

DEF_EXT_MAP_VALUE_SDES_MID

The default id assigned to the SDES mid extension.

DEF_EXT_MAP_VALUE_SDES_RTP_STREAM_ID

The default id assigned to the SDES RTP stream id extension.

DEF_EXT_MAP_VALUE_TRANSPORT_CC

The default id this crate assigns to the transport-wide CC extension.

SDES_MID_URI

The SDES mid extension URI, which tags each packet with its m-line.

SDES_REPAIR_RTP_STREAM_ID_URI

The SDES repaired RTP stream id extension URI, which identifies an RTX layer’s target.

SDES_RTP_STREAM_ID_URI

The SDES RTP stream id (RID) extension URI, which identifies a simulcast layer.

TRANSPORT_CC_URI

The transport-wide congestion control extension URI.

VIDEO_ORIENTATION_URI

The video-orientation (CVO) extension URI, carrying rotation flags.