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#include "qgstreamervideoprobecontrol_p.h"
#include <private/qvideosurfacegstsink_p.h>
#include <private/qgstvideobuffer_p.h>

QGstreamerVideoProbeControl::QGstreamerVideoProbeControl(QObject *parent)
    : QMediaVideoProbeControl(parent)
    , m_flushing(false)
    , m_frameProbed(false)
{

}

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::bufferProbed(GstBuffer* buffer)
{
    if (m_flushing)
        return;

    GstCaps* caps = gst_buffer_get_caps(buffer);
    if (!caps)
        return;

    int bytesPerLine = 0;
    QVideoSurfaceFormat format = QVideoSurfaceGstSink::formatForCaps(caps, &bytesPerLine);
    gst_caps_unref(caps);
    if (!format.isValid() || !bytesPerLine)
        return;

    QVideoFrame frame = QVideoFrame(new QGstVideoBuffer(buffer, bytesPerLine),
                                    format.frameSize(), format.pixelFormat());

    QVideoSurfaceGstSink::setFrameTimeStamps(&frame, buffer);

    m_frameProbed = true;

    {
        QMutexLocker locker(&m_frameMutex);
        m_pendingFrame = frame;
        QMetaObject::invokeMethod(this, "frameProbed", Qt::QueuedConnection);
    }
}

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