Changes some cast to C.gsize to ensure size_t compatibility

go.sum

@@ -1,4 +1,6 @@
 github.com/gotk3/gotk3 v0.4.0 h1:TIuhyQitGeRTxOQIV3AJlYtEWWJpC74JHwAIsxlH8MU=
 github.com/gotk3/gotk3 v0.4.0/go.mod h1:Eew3QBwAOBTrfFFDmsDE5wZWbcagBL1NUslj1GhRveo=
+github.com/gotk3/gotk3 v0.5.1 h1:zIZM2K4gmkGz1idEFVUPTQfAK/pnWoLKrlIjLOc4kzo=
+github.com/gotk3/gotk3 v0.5.1/go.mod h1:/hqFpkNa9T3JgNAE2fLvCdov7c5bw//FHNZrZ3Uv9/Q=
 github.com/mattn/go-pointer v0.0.1 h1:n+XhsuGeVO6MEAp7xyEukFINEa+Quek5psIR/ylA6o0=
 github.com/mattn/go-pointer v0.0.1/go.mod h1:2zXcozF6qYGgmsG+SeTZz3oAbFLdD3OWqnUbNvJZAlc=

gst/gst.go.h

@@ -1,6 +1,7 @@
 #ifndef __GST_GO_H__
 #define __GST_GO_H__
 
+#include <stdlib.h>
 #include <gst/gst.h>
 
 /*

gst/gst_buffer.go

@@ -77,7 +77,7 @@ func NewBufferFromBytes(b []byte) *Buffer {
 	str := string(b)
 	p := unsafe.Pointer(C.CString(str))
 	// memory is freed by gstreamer after building the new buffer
-	buf := C.gst_buffer_new_wrapped((C.gpointer)(p), C.gulong(len(str)))
+	buf := C.gst_buffer_new_wrapped((C.gpointer)(p), C.gsize(len(str)))
 	return wrapBuffer(buf)
 }
 
@@ -355,7 +355,7 @@ func (b *Buffer) CopyRegion(flags BufferCopyFlags, offset, size int64) *Buffer {
 // Extract extracts size bytes starting from offset in this buffer. The data extracted may be lower
 // than the actual size if the buffer did not contain enough data.
 func (b *Buffer) Extract(offset, size int64) []byte {
-	dest := C.malloc(C.sizeof_char * C.ulong(size))
+	dest := C.malloc(C.sizeof_char * C.gsize(size))
 	defer C.free(dest)
 	C.gst_buffer_extract(b.Instance(), C.gsize(offset), (C.gpointer)(unsafe.Pointer(dest)), C.gsize(size))
 	return C.GoBytes(dest, C.int(size))

gst/gst_mini_object.go

@@ -25,7 +25,7 @@ func NewMiniObject(flags MiniObjectFlags, gtype glib.Type) *MiniObject {
 	C.gst_mini_object_init(
 		C.toGstMiniObject(unsafe.Pointer(&cMiniObj)),
 		C.uint(flags),
-		C.ulong(gtype),
+		C.gsize(gtype),
 		nil, nil, nil,
 	)
 	return wrapMiniObject(&cMiniObj)

gst/gst_object.go

@@ -43,7 +43,7 @@ func (o *Object) Name() string {
 // Interfaces returns the interfaces associated with this object.
 func (o *Object) Interfaces() []string {
 	var size C.guint
-	ifaces := C.g_type_interfaces(C.ulong(o.TypeFromInstance()), &size)
+	ifaces := C.g_type_interfaces(C.gsize(o.TypeFromInstance()), &size)
 	if int(size) == 0 {
 		return nil
 	}