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
 
QMemoryVideoBuffer::QMemoryVideoBuffer(QByteArray data, int bytesPerLine)
    : QAbstractVideoBuffer(QVideoFrame::NoHandle),
      m_bytesPerLine(bytesPerLine),
      m_data(std::move(data))
{
}
 
QMemoryVideoBuffer::~QMemoryVideoBuffer() = default;
 
QVideoFrame::MapMode QMemoryVideoBuffer::mapMode() const
{
    return m_mapMode;
}
 
QAbstractVideoBuffer::MapData QMemoryVideoBuffer::map(QVideoFrame::MapMode mode)
{
    MapData mapData;
    if (m_mapMode == QVideoFrame::NotMapped && m_data.size() && mode != QVideoFrame::NotMapped) {
        m_mapMode = mode;
 
        mapData.nPlanes = 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.size[0] = m_data.size();
    }
 
    return mapData;
}
 
void QMemoryVideoBuffer::unmap()
{
    m_mapMode = QVideoFrame::NotMapped;
}
 
QByteArray QMemoryVideoBuffer::underlyingByteArray(int plane) const
{
    return plane == 0 ? m_data : QByteArray{};
}
 
QT_END_NAMESPACE