Add H266/VVC RTP packetizer and depacketizer (algesten#971)

* Add H266/VVC RTP packetizer and depacketizer (RFC 9328).

* Add RtcConfig::enable_h266(), make H.266 opt-in, expand tests.

* Document H266 codec support

* Fix H266 comment line widths

---------

Co-authored-by: Martin Algesten <martin@algesten.se>

Author: sr1990

CHANGELOG.md

@@ -1,5 +1,6 @@
 # Unreleased
 
+  * Add H266/VVC RTP packetizer and depacketizer #971
   * Negotiate SCTP max message size for data channels #852
   * Expose the negotiated DTLS protocol version #979
   * Make MTU size configurable #967

src/config.rs

@@ -269,6 +269,15 @@ impl RtcConfig {
         self
     }
 
+    /// Enable H266 (VVC) video codec.
+    ///
+    /// Disabled by default: no major browser (Chrome, Safari, Firefox)
+    /// currently supports H.266/VVC, so it is opt-in.
+    pub fn enable_h266(mut self, enabled: bool) -> Self {
+        self.codec_config.enable_h266(enabled);
+        self
+    }
+
     /// Enable VP9 video codec.
     ///
     /// Enabled by default.

src/format/codec.rs

@@ -35,6 +35,8 @@ pub enum Codec {
     // TODO show this when we support h265.
     #[doc(hidden)]
     H265,
+    /// H266/VVC.
+    H266,
     Vp8,
     Vp9,
     // TODO show this when we support Av1.
@@ -64,7 +66,7 @@ impl Codec {
     /// Tells if codec is video.
     pub fn is_video(&self) -> bool {
         use Codec::*;
-        matches!(self, H265 | H264 | Vp8 | Vp9 | Av1)
+        matches!(self, H266 | H265 | H264 | Vp8 | Vp9 | Av1)
     }
 
     /// Audio/Video.
@@ -86,6 +88,7 @@ impl<'a> From<&'a str> for Codec {
             "pcma" => Codec::PCMA,
             "h264" => Codec::H264,
             "h265" => Codec::H265,
+            "h266" => Codec::H266,
             "vp8" => Codec::Vp8,
             "vp9" => Codec::Vp9,
             "av1" => Codec::Av1,
@@ -103,6 +106,7 @@ impl fmt::Display for Codec {
             Codec::PCMA => write!(f, "PCMA"),
             Codec::H264 => write!(f, "H264"),
             Codec::H265 => write!(f, "H265"),
+            Codec::H266 => write!(f, "H266"),
             Codec::Vp8 => write!(f, "VP8"),
             Codec::Vp9 => write!(f, "VP9"),
             Codec::Av1 => write!(f, "AV1"),