Add GST Plugin

src/README.md

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+To be used as follows:
+
+```rust
+// Create the parsebin element
+let parsebin = gst::ElementFactory::make("parsebin", None).expect("Failed to create parsebin element");
+
+// Create the h264parse element
+let h264parse = gst::ElementFactory::make("h264parse", None).expect("Failed to create h264parse element");
+
+// Create the mp4mux element for fmp4
+let mp4mux = gst::ElementFactory::make("mp4mux", None).expect("Failed to create mp4mux element");
+mp4mux.set_property("fragment-duration", &2000u32).unwrap(); // Fragment duration in milliseconds
+mp4mux.set_property_from_str("streamable", "true"); // For streaming output
+
+// Add elements to the pipeline
+pipeline.add_many(&[&waylandsrc, &parsebin, &h264parse, &mp4mux, &moqsink])?;
+
+// Link the elements together
+waylandsrc.link(&parsebin)?;
+parsebin.link(&h264parse)?;
+h264parse.link(&mp4mux)?;
+mp4mux.link(&moqsink)?;
+```

src/lib.rs

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+#![allow(clippy::non_send_fields_in_send_ty, unused_doc_comments)]
+
+use gst::glib;
+
+mod warpsink;
+
+fn plugin_init(plugin: &gst::Plugin) -> Result<(), glib::BoolError> {
+    warpsink::register(plugin)?;
+    Ok(())
+}
+
+gst::plugin_define!(
+    warp,
+    env!("CARGO_PKG_DESCRIPTION"),
+    plugin_init,
+    concat!(env!("CARGO_PKG_VERSION"), "-", env!("COMMIT_ID")),
+    "MIT/X11",
+    env!("CARGO_PKG_NAME"),
+    env!("CARGO_PKG_NAME"),
+    env!("CARGO_PKG_REPOSITORY"),
+    env!("BUILD_REL_DATE")
+);

src/warpsink/imp.rs

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+use gst::glib;
+use gst::prelude::*;
+use gst::subclass::prelude::*;
+use gst_base::subclass::prelude::*;
+use gst_base::BaseSink;
+use once_cell::sync::Lazy;
+use std::sync::Mutex;
+
+// Define the plugin's instance structure with a URL property.
+pub struct MoqSink {
+    sink: gst_base::BaseSink,
+    url: Mutex<Option<String>>, // Store the URL property value
+    // Add additional fields for moq_transport as needed.
+}
+
+// Implement the GObject subclass for our sink.
+#[glib::object_subclass]
+impl ObjectSubclass for MoqSink {
+    const NAME: &'static str = "MoqSink";
+    type Type = super::MoqSink;
+    type ParentType = BaseSink;
+}
+
+// Implement the GstObject trait for our sink to set up the metadata.
+impl GstObjectImpl for MoqSink {}
+
+// Implement the Element trait for our sink. This is where we can add pads and set up
+// the element's functionality.
+impl ElementImpl for MoqSink {
+    // Define metadata for the element.
+    fn metadata() -> Option<&'static gst::subclass::ElementMetadata> {
+        static ELEMENT_METADATA: Lazy<gst::subclass::ElementMetadata> = Lazy::new(|| {
+            gst::subclass::ElementMetadata::new(
+                "MoQ Sink",
+                "Sink/Network",
+                "Send data over QUIC using the MoQ protocol",
+                "Wanjohi Ryan <elviswanjohi47@gmail.com>",
+            )
+        });
+        Some(&*ELEMENT_METADATA)
+    }
+}
+
+// Implement the properties and their behavior for the sink.
+impl ObjectImpl for MoqSink {
+    fn properties() -> &'static [glib::ParamSpec] {
+        static PROPERTIES: Lazy<Vec<glib::ParamSpec>> = Lazy::new(|| {
+            vec![
+                glib::ParamSpecString::new(
+                    "url",
+                    "URL",
+                    "URL to send data to",
+                    None, // Default value
+                    glib::ParamFlags::READWRITE,
+                ),
+            ]
+        });
+
+        PROPERTIES.as_ref()
+    }
+
+    fn set_property(&self, _id: usize, value: &glib::Value, pspec: &glib::ParamSpec) {
+        match pspec.name() {
+            "url" => {
+                let mut url = self.url.lock().unwrap();
+                *url = value.get().expect("Type checked upstream");
+            }
+            _ => unimplemented!(),
+        }
+    }
+
+    fn property(&self, _id: usize, pspec: &glib::ParamSpec) -> glib::Value {
+        match pspec.name() {
+            "url" => {
+                let url = self.url.lock().unwrap();
+                url.as_ref().to_value()
+            }
+            _ => unimplemented!(),
+        }
+    }
+}
+
+// Implement the BaseSink trait for our sink. This is where most of the sink logic is implemented.
+impl BaseSinkImpl for MoqSink {
+    fn start(&self, element: &Self::Type) -> Result<(), gst::ErrorMessage> {
+        // Initialize moq_transport here.
+        Ok(())
+    }
+
+    fn stop(&self, element: &Self::Type) -> Result<(), gst::ErrorMessage> {
+        // Clean up moq_transport here.
+        Ok(())
+    }
+
+    fn render(&self, element: &Self::Type, buffer: &gst::Buffer) -> Result<gst::FlowSuccess, gst::FlowError> {
+        // Send buffer data over QUIC using moq_transport.
+        // Extract data from the buffer
+        let data = buffer.map_readable().map_err(|_| gst::FlowError::Error)?;
+
+        // Assuming that the upstream element is producing MP4 atoms, we need to distinguish
+        // between 'moof' and 'mdat' atoms. We will also assume that each buffer contains a
+        // complete atom for simplicity. In a real-world scenario, you might need to handle
+        // partial atoms and reassemble them here.
+        //
+        // The first 4 bytes of the buffer contain the size of the atom, and the next 4 bytes
+        // contain the atom type. For 'moof' and 'mdat', we would send them as separate messages
+        // or bundle them together, depending on the protocol requirements.
+
+        // Check if the buffer is large enough to contain the size and type of the atom.
+        if data.len() < 8 {
+            gst::element_error!(
+                element,
+                gst::CoreError::Failed,
+                ("Buffer is too small to contain an MP4 atom")
+            );
+            return Err(gst::FlowError::Error);
+        }
+
+        // Read atom size and type
+        let size = u32::from_be_bytes(data[0..4].try_into().unwrap()) as usize;
+        let atom_type = &data[4..8];
+
+        // Ensure the buffer contains the complete atom
+        if size > data.len() {
+            gst::element_error!(
+                element,
+                gst::CoreError::Failed,
+                ("Buffer does not contain the complete MP4 atom")
+            );
+            return Err(gst::FlowError::Error);
+        }
+
+        // Handle 'moof' and 'mdat' atoms
+        match atom_type {
+            b"moof" => {
+                // Handle 'moof' atom
+                // Send the 'moof' atom over the moq_transport protocol
+                // self.moq_transport.send_moof(data.as_slice());
+            },
+            b"mdat" => {
+                // Handle 'mdat' atom
+                // Send the 'mdat' atom over the moq_transport protocol
+                // self.moq_transport.send_mdat(data.as_slice());
+            },
+            _ => {
+                // Handle other atoms or ignore them
+            }
+        }
+        Ok(gst::FlowSuccess::Ok)
+    }
+}

src/warpsink/mod.rs

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+use gst::glib;
+use gst::prelude::*;
+
+mod imp;
+
+glib::wrapper! {
+    pub struct MoqSink(ObjectSubclass<imp::MoqSink>) @extends gst_base::BaseSink, gst::Element, gst::Object;
+}
+
+pub fn register(plugin: &gst::Plugin) -> Result<(), glib::BoolError> {
+    gst::Element::register(
+        Some(plugin),
+        "moqsink",
+        gst::Rank::None,
+        MoqSink::static_type(),
+    )
+}