qandroidvideoframefactory.cpp

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// 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
 
#include <QtFFmpegMediaPluginImpl/private/qandroidvideoframefactory_p.h>
 
#include <QtMultimedia/qvideoframe.h>
 
QT_BEGIN_NAMESPACE
namespace {
// This is due to a limitation of ImageReader. When limit is reached, we cannot acquire more frames
// until we close any of the previous image. That is why, When the limit is reached, we will do
// a copy of the frame data and immediately close the image.
constexpr int NATIVE_FRAME_LIMIT = 10;
}
 
 
QVideoFrame QAndroidVideoFrameFactory::createVideoFrame(QtJniTypes::Image frame,
                                                        QtVideo::Rotation rotation)
{
    const int currentCounter = m_framesCounter.fetch_add(1, std::memory_order_relaxed) + 1;
 
    auto frameAdapter = std::make_unique<QAndroidVideoFrameBuffer>(
            frame,
            shared_from_this(),
            currentCounter > NATIVE_FRAME_LIMIT ?
                QAndroidVideoFrameBuffer::MemoryPolicy::Copy
              : QAndroidVideoFrameBuffer::MemoryPolicy::Reuse,
            rotation);
 
    if (!frameAdapter->isParsed())
        return QVideoFrame{};
 
    const qint64 currentTimeStamp = frameAdapter->timestamp();
    QVideoFrame videoFrame(std::move(frameAdapter));
 
    if (m_lastTimestamp == 0)
        m_lastTimestamp = currentTimeStamp;
 
    videoFrame.setStartTime(m_lastTimestamp);
    videoFrame.setEndTime(currentTimeStamp);
 
    m_lastTimestamp = currentTimeStamp;
 
    return videoFrame;
}
 
void QAndroidVideoFrameFactory::onFrameReleased()
{
    const int currentCounter = m_framesCounter.fetch_sub(1, std::memory_order_relaxed);
    Q_ASSERT(currentCounter >= 0);
}