File indexing completed on 2024-04-28 04:43:20

 /*
     Copyright (C) 2007-2008 Tanguy Krotoff <tkrotoff@gmail.com>
     Copyright (C) 2008 Lukas Durfina <lukas.durfina@gmail.com>
     Copyright (C) 2009 Fathi Boudra <fabo@kde.org>
     Copyright (C) 2009-2011 vlc-phonon AUTHORS <kde-multimedia@kde.org>
     Copyright (C) 2010-2011 Harald Sitter <sitter@kde.org>
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public
     License as published by the Free Software Foundation; either
     version 2.1 of the License, or (at your option) any later version.
 
     This library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Lesser General Public License for more details.
 
     You should have received a copy of the GNU Lesser General Public
     License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #ifndef PHONON_VLC_MEDIAOBJECT_H
 #define PHONON_VLC_MEDIAOBJECT_H
 
 #include <QtCore/QObject>
 #include <QtCore/QTimer>
 
 #include <phonon/mediaobjectinterface.h>
 #include <phonon/addoninterface.h>
 
 #include "mediacontroller.h"
 #include "mediaplayer.h"
 
 namespace Phonon
 {
 namespace VLC
 {
 
 class Media;
 class SinkNode;
 class StreamReader;
 
 /** \brief Implementation for the most important class in Phonon
  *
  * The MediaObject class is the workhorse for Phonon. It handles what is needed
  * to play media. It has a media source object used to configure what media to
  * play.
  *
  * It provides the essential methods setSource(), play(), seek() and additional
  * methods to configure the next media source, the transition between sources,
  * transition times, ticks, other.
  *
  * There are numerous signals that provide information about the state of the media
  * and of the playing process. The aboutToFinish() and finished() signals are used
  * to see when the current media is finished.
  *
  * This class does not contain methods directly involved with libVLC. This part is
  * handled by the VLCMediaObject class. There are protected methods and slots
  * inherited by that class, like playInternal(), seekInternal().
  * These methods have no implementation here.
  *
  * For documentation regarding the methods implemented for MediaObjectInterface, see
  * the Phonon documentation.
  *
  * \see Phonon::MediaObjectInterface
  * \see VLCMediaObject
  */
 class MediaObject : public QObject, public MediaObjectInterface, public MediaController
 {
     Q_OBJECT
     Q_INTERFACES(Phonon::MediaObjectInterface Phonon::AddonInterface)
     friend class SinkNode;
 
 public:
     /**
      * Initializes the members, connects the private slots to their corresponding signals,
      * sets the next media source to an empty media source.
      *
      * \param parent A parent for the QObject
      */
     explicit MediaObject(QObject *parent);
     ~MediaObject();
 
     /**
      * Reset members (those that need resetting anyway).
      * Should always be called before going to a new source.
      */
     void resetMembers();
 
     /**
      * If the current state is paused, it resumes playing. Else, the playback
      * is commenced.
      */
     void play() override;
 
     /// Pauses the playback for the media player.
     void pause() override;
 
     /// Sets the next media source to an empty one and stops playback.
     void stop() override;
 
     /// \returns \c true when there is a video available, \c false otherwise
     bool hasVideo() const override;
 
     /// \returns \c true when the MediaObject is seekable, \c false otherwise
     bool isSeekable() const override;
 
     /// \returns total time (length, duration) of the current MediaSource (-1 if unknown)
     qint64 totalTime() const override;
 
     /// \returns An error message with the last libVLC error.
     QString errorString() const override;
 
     /**
      * Adds a sink for this media object. During playInternal(), all the sinks
      * will have their addToMedia() called.
      *
      * \see playInternal()
      * \see SinkNode::addToMedia()
      */
     void addSink(SinkNode *node);
 
     /// Removes a sink from this media object.
     void removeSink(SinkNode *node);
 
     /**
      * Pushes a seek command to the SeekStack for this media object. The SeekStack then
      * calls seekInternal() when it's popped.
      */
     void seek(qint64 milliseconds) override;
 
     /**
      * \return The interval between successive tick() signals. If set to 0, the emission
      * of these signals is disabled.
      */
     qint32 tickInterval() const override;
 
     /**
      * Sets the interval between successive tick() signals. If set to 0, it disables the
      * emission of these signals.
      */
     void setTickInterval(qint32 tickInterval) override;
 
     /**
      * \return The current time of the media, depending on the current state.
      * If the current state is stopped or loading, 0 is returned.
      * If the current state is error or unknown, -1 is returned.
      */
     qint64 currentTime() const override;
 
     /// \return The current state for this media object.
     Phonon::State state() const override;
 
     /// All errors are categorized as normal errors.
     Phonon::ErrorType errorType() const override;
 
     /// \return The current media source for this media object.
     MediaSource source() const override;
 
     /**
      * Sets the current media source for this media object. Depending on the source type,
      * the media object loads the specified media. The MRL is passed to loadMedia(), if the media
      * is not a stream. The currentSourceChanged() signal
      * is emitted.
      *
      * Supported media source types:
      * \li local files
      * \li URL
      * \li discs (CD, DVD, VCD)
      * \li capture devices (V4L)
      * \li streams
      *
      * \param source The media source that will become the current source.
      *
      * \see loadMedia()
      */
     void setSource(const MediaSource &source) override;
 
     /// Sets the media source that will replace the current one, after the playback for it finishes.
     void setNextSource(const MediaSource &source) override;
 
     qint32 prefinishMark() const override;
     void setPrefinishMark(qint32 msecToEnd) override;
 
     qint32 transitionTime() const override;
     void setTransitionTime(qint32) override;
 
     void emitAboutToFinish();
 
 Q_SIGNALS:
     // MediaController signals
     void availableSubtitlesChanged();
     void availableAudioChannelsChanged();
 
     void availableChaptersChanged(int);
     void availableTitlesChanged(int);
 
     void chapterChanged(int chapterNumber);
     void titleChanged(int titleNumber);
     void durationChanged(qint64 newDuration);
 
     /**
      * New widget size computed by VLC.
      *
      * It should be applied to the widget that contains the VLC video.
      */
     void videoWidgetSizeChanged(int i_width, int i_height);
 
     void aboutToFinish();
     void bufferStatus(int percentFilled);
     void currentSourceChanged(const MediaSource &newSource);
     void finished();
     void hasVideoChanged(bool b_has_video);
     void metaDataChanged(const QMultiMap<QString, QString> & metaData);
     void prefinishMarkReached(qint32 msecToEnd);
     void seekableChanged(bool seekable);
     void stateChanged(Phonon::State newState, Phonon::State oldState);
     void tick(qint64 time);
     void totalTimeChanged(qint64 newTotalTime);
 
     void moveToNext();
 
 private Q_SLOTS:
     /**
      * If the new state is different from the current state, the current state is
      * changed and the corresponding signal is emitted.
      */
     void changeState(Phonon::State newState);
 
     /**
      * Checks when the tick(), prefinishMarkReached(), aboutToFinish() signals need to
      * be emitted and emits them if necessary.
      *
      * \param currentTime The current play time for the media, in milliseconds.
      */
     void timeChanged(qint64 time);
     void emitTick(qint64 time);
 
     /**
      * If the next media source is valid, the current source is replaced and playback is commenced.
      * The next source is set to an empty source.
      *
      * \see setNextSource()
      */
     void moveToNextSource();
 
     /*** Update media duration time - see comment in CPP */
     void updateDuration(qint64 newDuration);
 
     /** Retrieve meta data of a file (i.e ARTIST, TITLE, ALBUM, etc...). */
     void updateMetaData();
     void updateState(MediaPlayer::State state);
 
     /** Called when the availability of video output changed */
     void onHasVideoChanged(bool hasVideo);
 
     void setBufferStatus(int percent);
 
     /** Refreshes all MediaController descriptors if Video is present. */
     void refreshDescriptors();
 
 private:
     /**
      * This method actually calls the functions needed to begin playing the media.
      * If another media is already playing, it is discarded. The new media filename is set
      * with loadMediaInternal(). A new VLC Media is created and set into the VLC Media Player.
      * All the connected sink nodes are connected to the new media. It connects the media object
      * to the events for the VLC Media, updates the meta-data, sets up the video widget id, and
      * starts playing.
      *
      * \see loadMediaInternal()
      * \see connectToMediaVLCEvents()
      * \see updateMetaData()
      * \see setVLCWidgetId()
      */
     void setupMedia();
 
     /**
      * Seeks to the required position. If the state is not playing, the seek position is remembered.
      */
     void seekInternal(qint64 milliseconds);
 
     bool hasNextTrack();
 
     /**
      * Changes the current state to buffering and sets the new current file.
      *
      * \param filename The MRL of the media source
      */
     void loadMedia(const QByteArray &mrl);
 
     /**
      * Overload for loadMedia, converting a QString to a QByteArray.
      *
      * \param filename The MRL of the media source
      *
      * \see loadMedia
      */
     void loadMedia(const QString &mrl);
 
     /**
      * Uninitializes the media
      */
     void unloadMedia();
 
     MediaSource m_nextSource;
 
     MediaSource m_mediaSource;
     StreamReader *m_streamReader;
     Phonon::State m_state;
 
     qint32 m_prefinishMark;
     bool m_prefinishEmitted;
 
     bool m_aboutToFinishEmitted;
 
     qint32 m_tickInterval;
     qint64 m_lastTick;
     qint32 m_transitionTime;
 
     Media *m_media;
 
     qint64 m_totalTime;
     QByteArray m_mrl;
     QMultiMap<QString, QString> m_vlcMetaData;
     QList<SinkNode *> m_sinks;
 
     bool m_hasVideo;
     bool m_isScreen;
 
     /**
      * Workaround for being able to seek before VLC goes to playing state.
      * Seeks before playing are stored in this var, and processed on state change
      * to Playing.
      */
     qint64 m_seekpoint;
 
     int m_timesVideoChecked;
 
     bool m_buffering;
     Phonon::State m_stateAfterBuffering;
 };
 
 } // namespace VLC
 } // namespace Phonon
 
 #endif // PHONON_VLC_MEDIAOBJECT_H