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basicmedia.cpp Example File
simpleplayer/basicmedia.cpp

    /****************************************************************************
    **
    ** This file is part of the Qt Extended Commercial Package.
    **
    ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
    **
    ** $QT_EXTENDED_DUAL_LICENSE$
    **
    ****************************************************************************/

    #include "basicmedia.h"

    #include <QContent>
    #include <QMediaControlNotifier>
    #include <QMediaVideoControl>
    #include <QVBoxLayout>
    #include <QApplication>
    #include <QMediaControl>
    #include <QResizeEvent>
    #include <QSize>
    #include <QDebug>

    /*
       m_state 0  constructed
       m_state 1  set filename
       m_state 2  mediaControlValid
       m_state 3  mediaVideoControlValid
       m_state 4  stopped
       */

    BasicMedia::BasicMedia(QWidget* parent)
        : QWidget(parent), m_mediaContent(0), m_control(0), m_video(0), m_state(0), videoWidget(0)
    {
        layout = new QVBoxLayout;
        layout->setMargin(0);
        setLayout(layout);

        // First create a container for all player objects
        context = new QMediaContentContext(this);

        // watches a media content object for availability of a given media control
        QMediaControlNotifier* notifier = new QMediaControlNotifier(QMediaControl::name(), this);
        connect(notifier, SIGNAL(valid()), this, SLOT(mediaControlValid()));
        context->addObject(notifier);

        // watches a media content object for availability of a given media control
        QMediaControlNotifier* video = new QMediaControlNotifier(QMediaVideoControl::name(), this);
        connect(video, SIGNAL(valid()), this, SLOT(mediaVideoControlValid()));
        context->addObject(video);
        volume=100;
    }

    void BasicMedia::keyReleaseEvent( QKeyEvent *ke )
    {
        ke->ignore();
    }

    void BasicMedia::setFilename(QString f)
    {
        // Step 1: must set a file to play
        m_state = 1;
        vfile = f;
    }

    void BasicMedia::mediaVideoControlValid()
    {
        if(m_state == 2) {
            m_state = 3;

            delete m_video;
            delete videoWidget;

            // create video widget
            m_video = new QMediaVideoControl(m_mediaContent);

            videoWidget = m_video->createVideoWidget(this);
            if (!videoWidget) {
                qWarning("Failed to create video widget");
                return;
            }
            videoWidget->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
            // display the video widget on the screen
            layout->addWidget(videoWidget);
        } else {
            qWarning("(%d) ERROR BasicMedia::mediaVideoControlValid, should appear after mediaControlValid???",m_state);
        }
    }

    void BasicMedia::mediaControlValid()
    {
        if(m_state == 1) {
            m_state = 2;

            delete m_control;

            m_control = new QMediaControl(m_mediaContent);
            m_control->start();
        } else {
            qWarning("(%d) ERROR BasicMedia::mediaControlValid, must call setFilename() before start()!!!",m_state);
        }
    }

    BasicMedia::~BasicMedia()
    {
        delete m_mediaContent;
        delete m_control;
    }

    void BasicMedia::stop()
    {
        if(m_state == 3) {
            //Normal stop request
            m_control->stop();
            m_state=1;
        } else if(m_control) {
            //Video start play failed???
            m_control->stop();
            m_state=1;
        }
        if(m_state > 1) {
            if(m_video!=NULL) {
                delete m_video;
                delete videoWidget;
                delete m_mediaContent;

                m_video        = NULL;
                videoWidget    = NULL;
                m_mediaContent = NULL;
            }
        }
    }

    void BasicMedia::start()
    {
        if(m_state == 1) {
            QContent content(vfile);
            if (!content.isValid()) {
                qWarning() << "Failed to load" << vfile;
                return;
            }
            m_mediaContent = new QMediaContent(content);
            context->setMediaContent(m_mediaContent);
        } else {
            qWarning("(%d) BasicMedia::start() must stop() and setFilename() before calling start!!!",m_state);
        }
    }

    void BasicMedia::volumeup()
    {
        if(volume<90) {
            volume=volume+10;
            m_control->setVolume(volume);
        }
    }

    void BasicMedia::volumedown()
    {
        if(volume>10) {
            volume=volume-10;
            m_control->setVolume(volume);
        }
    }