gl: add memory access functions to GLVideoFrame

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1312>

gstreamer-gl/src/gl_video_frame.rs

@@ -2,6 +2,7 @@
 
 use std::{marker::PhantomData, mem, ptr};
 
+use crate::GLMemoryRef;
 use glib::translate::{from_glib, Borrowed, ToGlibPtr};
 use gst_video::VideoFrameExt;
 
@@ -43,11 +44,34 @@ impl<T> VideoFrameExt for GLVideoFrame<T> {
 }
 
 impl<T> GLVideoFrame<T> {
+    #[inline]
     #[doc(alias = "get_texture_id")]
     pub fn texture_id(&self, idx: u32) -> Option<u32> {
         self.as_video_frame_gl_ref().texture_id(idx)
     }
 
+    pub fn memory(&self, idx: u32) -> Option<&GLMemoryRef> {
+        if idx >= buffer_n_gl_memory(self.buffer())? {
+            return None;
+        }
+
+        unsafe {
+            let ptr = (*self.as_ptr()).map[idx as usize].memory as _;
+            Some(GLMemoryRef::from_ptr(ptr))
+        }
+    }
+
+    pub fn memory_mut(&self, idx: u32) -> Option<&mut GLMemoryRef> {
+        if idx >= buffer_n_gl_memory(self.buffer())? {
+            return None;
+        }
+
+        unsafe {
+            let ptr = (*self.as_ptr()).map[idx as usize].memory as _;
+            Some(GLMemoryRef::from_mut_ptr(ptr))
+        }
+    }
+
     #[inline]
     pub fn into_buffer(self) -> gst::Buffer {
         unsafe {
@@ -348,6 +372,17 @@ impl<'a> GLVideoFrameRef<&'a gst::BufferRef> {
             Some(*ptr)
         }
     }
+
+    pub fn memory(&self, idx: u32) -> Option<&GLMemoryRef> {
+        if idx >= buffer_n_gl_memory(self.buffer())? {
+            return None;
+        }
+
+        unsafe {
+            let ptr = (*self.as_ptr()).map[idx as usize].memory as _;
+            Some(GLMemoryRef::from_ptr(ptr))
+        }
+    }
 }
 
 impl<'a> GLVideoFrameRef<&'a mut gst::BufferRef> {
@@ -435,6 +470,17 @@ impl<'a> GLVideoFrameRef<&'a mut gst::BufferRef> {
     pub fn as_mut_ptr(&mut self) -> *mut gst_video::ffi::GstVideoFrame {
         &mut self.frame
     }
+
+    pub fn memory_mut(&self, idx: u32) -> Option<&mut GLMemoryRef> {
+        if idx >= buffer_n_gl_memory(self.buffer())? {
+            return None;
+        }
+
+        unsafe {
+            let ptr = (*self.as_ptr()).map[idx as usize].memory as _;
+            Some(GLMemoryRef::from_mut_ptr(ptr))
+        }
+    }
 }
 
 impl<'a> std::ops::Deref for GLVideoFrameRef<&'a mut gst::BufferRef> {