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// 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
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