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#ifndef VIDEOSURFACEGSTSINK_H
#define VIDEOSURFACEGSTSINK_H

#include <gst/video/gstvideosink.h>

#include <QtCore/qlist.h>
#include <QtCore/qmutex.h>
#include <QtCore/qqueue.h>
#include <QtCore/qpointer.h>
#include <QtCore/qwaitcondition.h>
#include <qvideosurfaceformat.h>
#include <qvideoframe.h>
#include <qabstractvideobuffer.h>

#include "qabstractgstbufferpool.h"

QT_BEGIN_NAMESPACE
class QAbstractVideoSurface;
QT_END_NAMESPACE

#if defined(Q_WS_X11) && !defined(QT_NO_XVIDEO)
class QGstXvImageBuffer;
class QGstXvImageBufferPool;
#endif

class QVideoSurfaceGstDelegate : public QObject
{
    Q_OBJECT
public:
    QVideoSurfaceGstDelegate(QAbstractVideoSurface *surface);
    ~QVideoSurfaceGstDelegate();

    QList<QVideoFrame::PixelFormat> supportedPixelFormats(
            QAbstractVideoBuffer::HandleType handleType = QAbstractVideoBuffer::NoHandle) const;

    QVideoSurfaceFormat surfaceFormat() const;

    bool start(const QVideoSurfaceFormat &format, int bytesPerLine);
    void stop();

    bool isActive();

    QAbstractGstBufferPool *pool() { return m_pool; }
    QMutex *poolMutex() { return &m_poolMutex; }

    GstFlowReturn render(GstBuffer *buffer);

private slots:
    void queuedStart();
    void queuedStop();
    void queuedRender();

    void updateSupportedFormats();

private:
    QPointer<QAbstractVideoSurface> m_surface;
    QList<QVideoFrame::PixelFormat> m_supportedPixelFormats;
    //pixel formats of buffers pool native type
    QList<QVideoFrame::PixelFormat> m_supportedPoolPixelFormats;
    QAbstractGstBufferPool *m_pool;
    QList<QAbstractGstBufferPool *> m_pools;
    QMutex m_poolMutex;
    QMutex m_mutex;
    QWaitCondition m_setupCondition;
    QWaitCondition m_renderCondition;
    QVideoSurfaceFormat m_format;
    QVideoFrame m_frame;
    GstFlowReturn m_renderReturn;
    int m_bytesPerLine;
    bool m_started;
};

class QVideoSurfaceGstSink
{
public:
    GstVideoSink parent;

    static QVideoSurfaceGstSink *createSink(QAbstractVideoSurface *surface);
    static QVideoSurfaceFormat formatForCaps(GstCaps *caps, int *bytesPerLine = 0);

private:
    static GType get_type();
    static void class_init(gpointer g_class, gpointer class_data);
    static void base_init(gpointer g_class);
    static void instance_init(GTypeInstance *instance, gpointer g_class);

    static void finalize(GObject *object);

    static GstStateChangeReturn change_state(GstElement *element, GstStateChange transition);

    static GstCaps *get_caps(GstBaseSink *sink);
    static gboolean set_caps(GstBaseSink *sink, GstCaps *caps);

    static GstFlowReturn buffer_alloc(
            GstBaseSink *sink, guint64 offset, guint size, GstCaps *caps, GstBuffer **buffer);

    static gboolean start(GstBaseSink *sink);
    static gboolean stop(GstBaseSink *sink);

    static gboolean unlock(GstBaseSink *sink);

    static gboolean event(GstBaseSink *sink, GstEvent *event);
    static GstFlowReturn preroll(GstBaseSink *sink, GstBuffer *buffer);
    static GstFlowReturn render(GstBaseSink *sink, GstBuffer *buffer);

private:
    QVideoSurfaceGstDelegate *delegate;

    GstCaps *lastRequestedCaps;
    GstCaps *lastBufferCaps;
    QVideoSurfaceFormat *lastSurfaceFormat;
};


class QVideoSurfaceGstSinkClass
{
public:
    GstVideoSinkClass parent_class;
};

#endif