analytics: Manually implement FFI GstTensor because of flexible array member

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1591>

gstreamer-analytics/sys/Gir.toml

@@ -50,3 +50,7 @@ boxed_inline = true
 name = "GstAnalytics.Mtd"
 status = "generate"
 boxed_inline = true
+
+[[object]]
+name = "GstAnalytics.Tensor"
+status = "manual"

gstreamer-analytics/sys/src/lib.rs

@@ -15,6 +15,10 @@
 use glib_sys as glib;
 use gstreamer_sys as gst;
 
+mod manual;
+
+pub use manual::*;
+
 #[cfg(unix)]
 #[allow(unused_imports)]
 use libc::{dev_t, gid_t, pid_t, socklen_t, uid_t};
@@ -206,34 +210,6 @@ impl ::std::fmt::Debug for GstAnalyticsTrackingMtd {
     }
 }
 
-#[repr(C)]
-#[allow(dead_code)]
-pub struct GstTensor {
-    pub id: glib::GQuark,
-    pub layout: GstTensorLayout,
-    pub data_type: GstTensorDataType,
-    pub batch_size: size_t,
-    pub data: *mut gst::GstBuffer,
-    pub dims_order: GstTensorDimOrder,
-    pub num_dims: size_t,
-    _truncated_record_marker: c_void,
-    // /*Ignored*/field dims has empty c:type
-}
-
-impl ::std::fmt::Debug for GstTensor {
-    fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
-        f.debug_struct(&format!("GstTensor @ {self:p}"))
-            .field("id", &self.id)
-            .field("layout", &self.layout)
-            .field("data_type", &self.data_type)
-            .field("batch_size", &self.batch_size)
-            .field("data", &self.data)
-            .field("dims_order", &self.dims_order)
-            .field("num_dims", &self.num_dims)
-            .finish()
-    }
-}
-
 #[derive(Copy, Clone)]
 #[repr(C)]
 pub struct GstTensorDim {

gstreamer-analytics/sys/src/manual.rs

@@ -0,0 +1,33 @@
+use gstreamer_sys as gst_sys;
+use libc::size_t;
+
+use crate::{GstTensorDataType, GstTensorDim, GstTensorDimOrder, GstTensorLayout};
+
+#[repr(C)]
+pub struct GstTensor {
+    pub id: glib_sys::GQuark,
+    pub layout: GstTensorLayout,
+    pub data_type: GstTensorDataType,
+    pub batch_size: size_t,
+    pub data: *mut gst_sys::GstBuffer,
+    pub dims_order: GstTensorDimOrder,
+    pub num_dims: size_t,
+    pub dims: [GstTensorDim; 0],
+}
+
+impl ::std::fmt::Debug for GstTensor {
+    fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+        f.debug_struct(&format!("GstTensor @ {self:p}"))
+            .field("id", &self.id)
+            .field("layout", &self.layout)
+            .field("data_type", &self.data_type)
+            .field("batch_size", &self.batch_size)
+            .field("data", &self.data)
+            .field("dims_order", &self.dims_order)
+            .field("num_dims", &self.num_dims)
+            .field("dims", &unsafe {
+                ::std::slice::from_raw_parts(self.dims.as_ptr(), self.num_dims)
+            })
+            .finish()
+    }
+}