Add initial version of NDI sink

The sink can accept audio or video directly, or if both should be
provided at once it is necesary to use the ndisinkcombiner before the
ndisink to merge both audio and video into the same stream.

Fixes #10

Cargo.toml

@@ -20,9 +20,10 @@ once_cell = "1.0"
 gst-plugin-version-helper = "0.2"
 
 [features]
-default = ["interlaced-fields", "reference-timestamps"]
+default = ["interlaced-fields", "reference-timestamps", "sink"]
 interlaced-fields = ["gst/v1_16", "gst-video/v1_16"]
 reference-timestamps = ["gst/v1_14"]
+sink = ["gst/v1_18", "gst-base/v1_18"]
 
 [lib]
 name = "gstndi"

src/lib.rs

@@ -3,6 +3,12 @@ use glib::prelude::*;
 mod device_provider;
 pub mod ndi;
 mod ndiaudiosrc;
+#[cfg(feature = "sink")]
+mod ndisink;
+#[cfg(feature = "sink")]
+mod ndisinkcombiner;
+#[cfg(feature = "sink")]
+pub mod ndisinkmeta;
 pub mod ndisys;
 mod ndivideosrc;
 pub mod receiver;
@@ -35,9 +41,15 @@ fn plugin_init(plugin: &gst::Plugin) -> Result<(), glib::BoolError> {
         return Err(glib::glib_bool_error!("Cannot initialize NDI"));
     }
 
+    device_provider::register(plugin)?;
+
     ndivideosrc::register(plugin)?;
     ndiaudiosrc::register(plugin)?;
-    device_provider::register(plugin)?;
+    #[cfg(feature = "sink")]
+    {
+        ndisinkcombiner::register(plugin)?;
+        ndisink::register(plugin)?;
+    }
     Ok(())
 }