qt-everywhere-src-5.15.1/qtmultimedia/src/gsttools/qgstreamervideoprobecontrol.cpp

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#include "qgstreamervideoprobecontrol_p.h"

#include "qgstutils_p.h"
#include <private/qgstvideobuffer_p.h>

QGstreamerVideoProbeControl::QGstreamerVideoProbeControl(QObject *parent)
    : QMediaVideoProbeControl(parent)
{
}

QGstreamerVideoProbeControl::~QGstreamerVideoProbeControl()
{
}

void QGstreamerVideoProbeControl::startFlushing()
{
    m_flushing = true;

    {
        QMutexLocker locker(&m_frameMutex);
        m_pendingFrame = QVideoFrame();
    }

    // only emit flush if at least one frame was probed
    if (m_frameProbed)
        emit flush();
}

void QGstreamerVideoProbeControl::stopFlushing()
{
    m_flushing = false;
}

void QGstreamerVideoProbeControl::probeCaps(GstCaps *caps)
{
#if GST_CHECK_VERSION(1,0,0)
    GstVideoInfo videoInfo;
    QVideoSurfaceFormat format = QGstUtils::formatForCaps(caps, &videoInfo);

    QMutexLocker locker(&m_frameMutex);
    m_videoInfo = videoInfo;
#else
    int bytesPerLine = 0;
    QVideoSurfaceFormat format = QGstUtils::formatForCaps(caps, &bytesPerLine);

    QMutexLocker locker(&m_frameMutex);
    m_bytesPerLine = bytesPerLine;
#endif
    m_format = format;
}

bool QGstreamerVideoProbeControl::probeBuffer(GstBuffer *buffer)
{
    QMutexLocker locker(&m_frameMutex);

    if (m_flushing || !m_format.isValid())
        return true;

    QVideoFrame frame(
#if GST_CHECK_VERSION(1,0,0)
                new QGstVideoBuffer(buffer, m_videoInfo),
#else
                new QGstVideoBuffer(buffer, m_bytesPerLine),
#endif
                m_format.frameSize(),
                m_format.pixelFormat());

    QGstUtils::setFrameTimeStamps(&frame, buffer);

    m_frameProbed = true;

    if (!m_pendingFrame.isValid())
        QMetaObject::invokeMethod(this, "frameProbed", Qt::QueuedConnection);
    m_pendingFrame = frame;

    return true;
}

void QGstreamerVideoProbeControl::frameProbed()
{
    QVideoFrame frame;
    {
        QMutexLocker locker(&m_frameMutex);
        if (!m_pendingFrame.isValid())
            return;
        frame = m_pendingFrame;
        m_pendingFrame = QVideoFrame();
    }
    emit videoFrameProbed(frame);
}