1 files changed, 66 insertions, 0 deletions
diff --git a/src/plugins/multimedia/ffmpeg/qv4l2memorytransfer_p.h b/src/plugins/multimedia/ffmpeg/qv4l2memorytransfer_p.h
new file mode 100644
index 000000000..6b5e3913f
--- /dev/null
+++ b/src/plugins/multimedia/ffmpeg/qv4l2memorytransfer_p.h
@@ -0,0 +1,66 @@
+// Copyright (C) 2023 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 QV4L2MEMORYTRANSFER_P_H
+#define QV4L2MEMORYTRANSFER_P_H
+
+#include <private/qtmultimediaglobal_p.h>
+#include <qbytearray.h>
+#include <linux/videodev2.h>
+
+#include <memory>
+
+QT_BEGIN_NAMESPACE
+
+//
+//  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.
+//
+
+class QV4L2FileDescriptor;
+using QV4L2FileDescriptorPtr = std::shared_ptr<QV4L2FileDescriptor>;
+
+class QV4L2MemoryTransfer
+{
+public:
+    struct Buffer
+    {
+        v4l2_buffer v4l2Buffer = {};
+        QByteArray data;
+    };
+
+    QV4L2MemoryTransfer(QV4L2FileDescriptorPtr fileDescriptor);
+
+    virtual ~QV4L2MemoryTransfer();
+
+    virtual std::optional<Buffer> dequeueBuffer() = 0;
+
+    virtual bool enqueueBuffer(quint32 index) = 0;
+
+    virtual quint32 buffersCount() const = 0;
+
+protected:
+    bool enqueueBuffers();
+
+    const QV4L2FileDescriptor &fileDescriptor() const { return *m_fileDescriptor; }
+
+private:
+    QV4L2FileDescriptorPtr m_fileDescriptor;
+};
+
+using QV4L2MemoryTransferUPtr = std::unique_ptr<QV4L2MemoryTransfer>;
+
+QV4L2MemoryTransferUPtr makeUserPtrMemoryTransfer(QV4L2FileDescriptorPtr fileDescriptor,
+                                                  quint32 imageSize);
+
+QV4L2MemoryTransferUPtr makeMMapMemoryTransfer(QV4L2FileDescriptorPtr fileDescriptor);
+
+QT_END_NAMESPACE
+
+#endif // QV4L2MEMORYTRANSFER_P_H