ANNOUNCE_CANCEL — MoQT draft-09 §7.11.

The subscriber sends an ANNOUNCE_CANCEL control message to indicate it will stop sending new subscriptions for tracks within the provided Track Namespace.

ANNOUNCE_CANCEL Message {
  Type (i) = 0xC,
  Length (i),
  Track Namespace (tuple),
  Error Code (i),
  Reason Phrase Length (i),
  Reason Phrase Length (..),
}

Figure 12: MOQT ANNOUNCE_CANCEL Message

Track Namespace: Identifies a track's namespace as defined in (Section 2.4.1).
Error Code: Identifies an integer error code for canceling the announcement. ANNOUNCE_CANCEL uses the same error codes as ANNOUNCE_ERROR (Section 7.10).
Reason Phrase: Provides the reason for announcement cancelation.