qgstvideorenderersink_p.h

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// Copyright (C) 2016 Jolla Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#ifndef QGSTVIDEORENDERERSINK_P_H
#define QGSTVIDEORENDERERSINK_P_H
 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
 
#include <QtMultimedia/private/qtmultimediaglobal_p.h>
#include <gst/video/gstvideosink.h>
#include <gst/video/video.h>
 
#include <QtCore/qlist.h>
#include <QtCore/qmutex.h>
#include <QtCore/qqueue.h>
#include <QtCore/qpointer.h>
#include <QtCore/qwaitcondition.h>
#include <qvideoframeformat.h>
#include <qvideoframe.h>
#include <qgstvideobuffer_p.h>
#include <qgst_p.h>
 
QT_BEGIN_NAMESPACE
class QVideoSink;
 
class QGstVideoRenderer : public QObject
{
    Q_OBJECT
public:
    QGstVideoRenderer(QGstreamerVideoSink *sink);
    ~QGstVideoRenderer();
 
    QGstCaps caps();
 
    bool start(const QGstCaps& caps);
    void stop();
    void unlock();
    bool proposeAllocation(GstQuery *query);
 
    void flush();
 
    GstFlowReturn render(GstBuffer *buffer);
 
    bool event(QEvent *event) override;
    bool query(GstQuery *query);
    void gstEvent(GstEvent *event);
 
private slots:
    bool handleEvent(QMutexLocker<QMutex> *locker);
 
private:
    void notify();
    bool waitForAsyncEvent(QMutexLocker<QMutex> *locker, QWaitCondition *condition, unsigned long time);
    void createSurfaceCaps();
 
    QPointer<QGstreamerVideoSink> m_sink;
 
    QMutex m_mutex;
    QWaitCondition m_setupCondition;
    QWaitCondition m_renderCondition;
 
    // --- accessed from multiple threads, need to hold mutex to access
    GstFlowReturn m_renderReturn = GST_FLOW_OK;
    bool m_active = false;
 
    QGstCaps m_surfaceCaps;
 
    QGstCaps m_startCaps;
    GstBuffer *m_renderBuffer = nullptr;
 
    bool m_notified = false;
    bool m_stop = false;
    bool m_flush = false;
    bool m_frameMirrored = false;
    QVideoFrame::RotationAngle m_frameRotationAngle = QVideoFrame::Rotation0;
 
    // --- only accessed from one thread
    QVideoFrameFormat m_format;
    GstVideoInfo m_videoInfo;
    bool m_flushed = true;
    QGstCaps::MemoryFormat memoryFormat = QGstCaps::CpuMemory;
};
 
class Q_MULTIMEDIA_EXPORT QGstVideoRendererSink
{
public:
    GstVideoSink parent;
 
    static QGstVideoRendererSink *createSink(QGstreamerVideoSink *surface);
    static void setSink(QGstreamerVideoSink *surface);
 
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 void handleShowPrerollChange(GObject *o, GParamSpec *p, gpointer d);
 
    static GstStateChangeReturn change_state(GstElement *element, GstStateChange transition);
 
    static GstCaps *get_caps(GstBaseSink *sink, GstCaps *filter);
    static gboolean set_caps(GstBaseSink *sink, GstCaps *caps);
 
    static gboolean propose_allocation(GstBaseSink *sink, GstQuery *query);
 
    static gboolean stop(GstBaseSink *sink);
 
    static gboolean unlock(GstBaseSink *sink);
 
    static GstFlowReturn show_frame(GstVideoSink *sink, GstBuffer *buffer);
    static gboolean query(GstBaseSink *element, GstQuery *query);
    static gboolean event(GstBaseSink *element, GstEvent * event);
 
private:
    QGstVideoRenderer *renderer = nullptr;
};
 
 
class QGstVideoRendererSinkClass
{
public:
    GstVideoSinkClass parent_class;
};
 
QT_END_NAMESPACE
 
#endif