qmemoryvideobuffer.cpp

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// Copyright (C) 2016 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
 
#include "qmemoryvideobuffer_p.h"
 
QT_BEGIN_NAMESPACE
 
/*!
    \class QMemoryVideoBuffer
    \brief The QMemoryVideoBuffer class provides a system memory allocated video data buffer.
    \internal
 
    QMemoryVideoBuffer is the default video buffer for allocating system memory.  It may be used to
    allocate memory for a QVideoFrame without implementing your own QAbstractVideoBuffer.
*/
 
/*!
    Constructs a video buffer with an image stride of \a bytesPerLine from a byte \a array.
*/
QMemoryVideoBuffer::QMemoryVideoBuffer(QByteArray data, int bytesPerLine)
    : m_bytesPerLine(bytesPerLine), m_data(std::move(data))
{
}
 
/*!
    Destroys a system memory allocated video buffer.
*/
QMemoryVideoBuffer::~QMemoryVideoBuffer() = default;
 
/*!
    \reimp
*/
QAbstractVideoBuffer::MapData QMemoryVideoBuffer::map(QVideoFrame::MapMode mode)
{
    MapData mapData;
 
    if (!m_data.isEmpty()) {
        mapData.planeCount = 1;
        mapData.bytesPerLine[0] = m_bytesPerLine;
        // avoid detaching and extra copying in case the underlyingByteArray is
        // being held by textures or anything else.
        if (mode == QVideoFrame::ReadOnly)
            mapData.data[0] = reinterpret_cast<uchar *>(const_cast<char *>(m_data.constData()));
        else
            mapData.data[0] = reinterpret_cast<uchar *>(m_data.data());
        mapData.dataSize[0] = m_data.size();
    }
 
    return mapData;
}
 
QT_END_NAMESPACE