gstreamer: Automatically generate Allocator::alloc

Parameter mutability has been fixed (and reverted, hence overridden with
const=true)for this function in gstreamer; it can now be automatically
generated.

gstreamer/Gir.toml

@@ -64,6 +64,8 @@ manual = [
     "GLib.Source",
     "GObject.Object",
     "GObject.Value",
+    "Gst.AllocationParams",
+    "Gst.Memory",
     "Gst.Segment",
     "Gst.StaticCaps",
     "Gst.StaticPadTemplate",
@@ -72,7 +74,14 @@ manual = [
 [[object]]
 name = "Gst.Allocator"
 status = "generate"
-manual_traits = ["AllocatorExtManual"]
+
+    [[object.function]]
+    name = "alloc"
+        [object.function.return]
+        nullable_return_is_error = "Failed to allocate memory"
+        [[object.function.parameter]]
+        name = "params"
+        const = true
 
 [[object]]
 name = "Gst.Bin"

gstreamer/src/allocator.rs

@@ -1,42 +0,0 @@
-// Take a look at the license at the top of the repository in the LICENSE file.
-
-use std::ptr;
-
-use glib::translate::from_glib_full;
-use glib::IsA;
-
-use crate::AllocationParams;
-use crate::Allocator;
-use crate::Memory;
-
-pub trait AllocatorExtManual: 'static {
-    fn alloc(
-        &self,
-        size: usize,
-        params: Option<&AllocationParams>,
-    ) -> Result<Memory, glib::BoolError>;
-}
-
-impl<O: IsA<Allocator>> AllocatorExtManual for O {
-    fn alloc(
-        &self,
-        size: usize,
-        params: Option<&AllocationParams>,
-    ) -> Result<Memory, glib::BoolError> {
-        unsafe {
-            let ret = ffi::gst_allocator_alloc(
-                self.as_ptr() as *mut _,
-                size,
-                match params {
-                    Some(val) => val.as_ptr() as *mut _,
-                    None => ptr::null_mut(),
-                },
-            );
-            if ret.is_null() {
-                Err(glib::bool_error!("Failed to allocate memory"))
-            } else {
-                Ok(from_glib_full(ret))
-            }
-        }
-    }
-}

gstreamer/src/auto/allocator.rs

@@ -2,6 +2,8 @@
 // from gir-files (https://github.com/gtk-rs/gir-files)
 // DO NOT EDIT
 
+use crate::AllocationParams;
+use crate::Memory;
 use crate::Object;
 use glib::object::IsA;
 use glib::translate::*;
@@ -36,24 +38,32 @@ unsafe impl Sync for Allocator {}
 pub const NONE_ALLOCATOR: Option<&Allocator> = None;
 
 pub trait AllocatorExt: 'static {
-    //#[doc(alias = "gst_allocator_alloc")]
-    //fn alloc(&self, size: usize, params: /*Ignored*/Option<&mut AllocationParams>) -> /*Ignored*/Option<Memory>;
-
-    //#[doc(alias = "gst_allocator_free")]
-    //fn free(&self, memory: /*Ignored*/&mut Memory);
+    #[doc(alias = "gst_allocator_alloc")]
+    fn alloc(
+        &self,
+        size: usize,
+        params: Option<&AllocationParams>,
+    ) -> Result<Memory, glib::BoolError>;
 
     #[doc(alias = "gst_allocator_set_default")]
     fn set_default(&self);
 }
 
 impl<O: IsA<Allocator>> AllocatorExt for O {
-    //fn alloc(&self, size: usize, params: /*Ignored*/Option<&mut AllocationParams>) -> /*Ignored*/Option<Memory> {
-    //    unsafe { TODO: call ffi:gst_allocator_alloc() }
-    //}
-
-    //fn free(&self, memory: /*Ignored*/&mut Memory) {
-    //    unsafe { TODO: call ffi:gst_allocator_free() }
-    //}
+    fn alloc(
+        &self,
+        size: usize,
+        params: Option<&AllocationParams>,
+    ) -> Result<Memory, glib::BoolError> {
+        unsafe {
+            Option::<_>::from_glib_full(ffi::gst_allocator_alloc(
+                self.as_ref().to_glib_none().0,
+                size,
+                mut_override(params.to_glib_none().0),
+            ))
+            .ok_or_else(|| glib::bool_error!("Failed to allocate memory"))
+        }
+    }
 
     fn set_default(&self) {
         unsafe {

gstreamer/src/lib.rs

@@ -126,8 +126,6 @@ mod element;
 
 mod bin;
 
-mod allocator;
-pub use crate::allocator::AllocatorExtManual;
 mod pipeline;
 pub use crate::pipeline::GstPipelineExtManual;
 
@@ -317,7 +315,6 @@ pub mod prelude {
 
     pub use crate::meta::MetaAPI;
 
-    pub use crate::allocator::AllocatorExtManual;
     pub use crate::bin::GstBinExtManual;
     pub use crate::element::{ElementClassExt, ElementExtManual};