moq-gst: replace moqsink with a rewritten, unit-tested core

doc/bin/gstreamer.md

@@ -30,6 +30,14 @@ Both elements support the following properties:
 For `http://` URLs, `moq-native` automatically fetches the server's certificate fingerprint from `/certificate.sha256` and verifies TLS against it. You don't need `tls-disable-verify` for local development.
 :::
 
+`moqsink` additionally exposes these read-only properties for monitoring:
+
+| Property                 | Type   | Description                                                  |
+| ------------------------ | ------ | ----------------------------------------------------------- |
+| `connected`              | bool   | Whether the publish session is currently connected          |
+| `moq-version`            | string | The negotiated MoQ protocol version; null when disconnected |
+| `estimated-send-bitrate` | uint64 | Estimated send bitrate in bits per second; 0 when unavailable |
+
 ## Prerequisites
 
 The plugin requires GStreamer development libraries. It is **not** built by default since most users don't have them installed.

rs/justfile

@@ -74,6 +74,10 @@ fix:
 test *args:
     cargo test --all-targets {{ args }}
 
+# moq-gst is outside default-members (needs GStreamer), so `test` above skips it.
+test-moq-gst *args:
+    cargo test -p moq-gst --all-targets {{ args }}
+
 build:
     cargo build
 

rs/moq-gst/Cargo.toml

@@ -31,3 +31,6 @@ url = "2"
 
 [build-dependencies]
 gst-plugin-version-helper = "0.8"
+
+[dev-dependencies]
+gst = { package = "gstreamer", version = "0.23" }

rs/moq-gst/src/lib.rs

@@ -32,8 +32,8 @@ gst::plugin_define!(
 	env!("CARGO_PKG_DESCRIPTION"),
 	plugin_init,
 	concat!(env!("CARGO_PKG_VERSION"), "-", env!("COMMIT_ID")),
-	// GStreamer only loads plugins whose license string is in its recognised set. "Apache 2.0" is not,
-	// so the registry silently refuses the plugin. The crate is MIT OR Apache-2.0, so declare the MIT side.
+	// GStreamer only loads plugins whose license is in its recognised set; the crate is
+	// MIT OR Apache-2.0, so declare the MIT side ("Apache 2.0" is rejected and the plugin never loads).
 	"MIT/X11",
 	env!("CARGO_PKG_NAME"),
 	env!("CARGO_PKG_NAME"),