1 files changed, 82 insertions, 0 deletions
diff --git a/src/plugins/multimedia/gstreamer/common/qglist_helper_p.h b/src/plugins/multimedia/gstreamer/common/qglist_helper_p.h
new file mode 100644
index 000000000..54108e1c3
--- /dev/null
+++ b/src/plugins/multimedia/gstreamer/common/qglist_helper_p.h
@@ -0,0 +1,82 @@
+// Copyright (C) 2024 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#ifndef QGLIST_HELPER_P_H
+#define QGLIST_HELPER_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API. It exists purely as an
+// implementation detail. This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/qtconfigmacros.h>
+
+#include <glib.h>
+#include <iterator>
+
+QT_BEGIN_NAMESPACE
+
+namespace QGstUtils {
+
+template <typename ListType>
+struct GListIterator
+{
+    explicit GListIterator(const GList *element = nullptr) : element(element) { }
+
+    const ListType &operator*() const noexcept { return *operator->(); }
+    const ListType *operator->() const noexcept
+    {
+        return reinterpret_cast<const ListType *>(&element->data);
+    }
+
+    GListIterator &operator++() noexcept
+    {
+        if (element)
+            element = element->next;
+
+        return *this;
+    }
+    GListIterator operator++(int n) noexcept
+    {
+        for (int i = 0; i != n; ++i)
+            operator++();
+
+        return *this;
+    }
+
+    bool operator==(const GListIterator &r) const noexcept { return element == r.element; }
+    bool operator!=(const GListIterator &r) const noexcept { return element != r.element; }
+
+    using difference_type = std::ptrdiff_t;
+    using value_type = ListType;
+    using pointer = value_type *;
+    using reference = value_type &;
+    using iterator_category = std::input_iterator_tag;
+
+    const GList *element = nullptr;
+};
+
+template <typename ListType>
+struct GListRangeAdaptor
+{
+    static_assert(std::is_pointer_v<ListType>);
+
+    explicit GListRangeAdaptor(const GList *list) : head(list) { }
+
+    auto begin() { return GListIterator<ListType>(head); }
+    auto end() { return GListIterator<ListType>(nullptr); }
+
+    const GList *head;
+};
+
+} // namespace QGstUtils
+
+QT_END_NAMESPACE
+
+#endif