feat: Restructure the gst parent<->child relations

gst/src/pad.rs

@@ -1,13 +1,35 @@
-use crate::*;
-/// Pads are link points between elements
+use crate::priv_prelude::*;
+
+#[derive(Debug)]
 #[repr(transparent)]
 pub struct Pad {
     pub(crate) inner: gstreamer::Pad,
 }
-
 impl From<gstreamer::Pad> for Pad {
     fn from(inner: gstreamer::Pad) -> Self {
-        Pad { inner }
+        Self { inner }
+    }
+}
+impl From<Pad> for gstreamer::Pad {
+    fn from(wrapper: Pad) -> Self {
+        wrapper.inner
+    }
+}
+impl Pad {
+    pub fn into_inner(self) -> gstreamer::Pad {
+        self.inner
+    }
+}
+impl GstWrapper for Pad {
+    type GstType = gstreamer::Pad;
+    fn from_gst(gst: Self::GstType) -> Self {
+        Self { inner: gst }
+    }
+    fn into_gst(self) -> Self::GstType {
+        self.inner
+    }
+    fn as_gst_ref(&self) -> &Self::GstType {
+        &self.inner
     }
 }
 
@@ -30,6 +52,15 @@ impl Pad {
         Ok(())
     }
 
+    pub fn current_caps(&self) -> Result<Caps> {
+        let caps = self
+            .inner
+            .current_caps()
+            .ok_or(Error)
+            .attach("Failed to get pad caps")?;
+        Ok(Caps { inner: caps })
+    }
+
     pub fn activate(&self, activate: bool) -> Result<()> {
         use gstreamer::prelude::*;
         self.inner