QmlVlcMmVideoOutput.h

/*******************************************************************************
* Copyright (c) 2014, Sergey Radionov <rsatom_gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
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*      this list of conditions and the following disclaimer in the documentation
*      and/or other materials provided with the distribution.

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#ifndef QMLVLCMMVIDEOOUTPUT_H
#define QMLVLCMMVIDEOOUTPUT_H

#include <cassert>

#include <QObject>
#include <QMutex>
#include <QVideoSurfaceFormat>
class QAbstractVideoSurface; //#include <QAbstractVideoSurface>
#include <QQmlParserStatus>

#ifndef Q_MOC_RUN
#include "libvlc_wrapper/vlc_player.h"
#include "libvlc_wrapper/vlc_vmem.h"
#endif // Q_MOC_RUN

class QmlVlcMmVideoOutput
    : public QObject,
      private vlc::basic_vmem_wrapper
{
    Q_OBJECT
public:
    explicit QmlVlcMmVideoOutput( vlc::player* player, QObject *parent = 0 );
    void init();

    QAbstractVideoSurface* videoSurface() const { return m_videoSurface; }
    void setVideoSurface( QAbstractVideoSurface* s );

private:
    Q_INVOKABLE void updateSurfaceFormat( const QVideoSurfaceFormat& newFormat );
    Q_INVOKABLE void presentFrame( const QVideoFrame& newFrame );
    Q_INVOKABLE void cleanupVideoSurface();

    void initVideoSurface( const QVideoSurfaceFormat& format );

private:
    //for libvlc_video_set_format_callbacks
    virtual unsigned video_format_cb( char *chroma,
                                      unsigned *width, unsigned *height,
                                      unsigned *pitches, unsigned *lines );
    virtual void video_cleanup_cb();
    //end (for libvlc_video_set_format_callbacks)

    //for libvlc_video_set_callbacks
    virtual void* video_lock_cb( void **planes );
    virtual void  video_unlock_cb( void *picture, void *const *planes );
    virtual void  video_display_cb( void *picture );
    //end (for libvlc_video_set_callbacks)

protected:
    vlc::player& player() { assert( m_player ); return *m_player; }

private:
    vlc::player *const m_player;
    QAbstractVideoSurface* m_videoSurface;

    QVideoSurfaceFormat m_surfaceFormat;

    //for use in decode thread only
    QVideoFrame::PixelFormat m_pixelFormat;
    unsigned short m_frameWidth;
    unsigned short m_frameHeight;
    unsigned m_frameSize;
    unsigned m_pitchSize;
    unsigned m_UPlaneOffset;
    unsigned m_VPlaneOffset;
    QVideoFrame m_videoFrame;
};

#endif //QMLVLCMMVIDEOOUTPUT_H