Clip.h 6.59 KB
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/*****************************************************************************
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 * Clip.h : Represents a basic container for media informations.
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 *****************************************************************************
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 * Copyright (C) 2008-2010 VideoLAN
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 *
 * Authors: Hugo Beauzee-Luyssen <hugo@vlmc.org>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

/** \file
  * This file contains the Clip class declaration/definition.
  * It's used by the timeline in order to represent a subset of a media
  */

#ifndef CLIP_H__
# define CLIP_H__

#include <QObject>
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#include <QStringList>
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#include <QUuid>
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class   MediaContainer;
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class   Media;
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class   QXmlStreamWriter;
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class   Clip : public QObject
{
    Q_OBJECT

    public:
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        static const int DefaultFPS;
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        /**
         *  \brief  Constructs a Clip that is a subpart of a Media.
         *
         *  \param  parent  The media to represent.
         *  \param  begin   The clip beginning (in frames, from the parent's beginning)
         *  \param  end     The end, in frames, from the parent's beginning. If not given,
         *                  the end of the parent will be used.
         *  \param  uuid    A unique identifier. If not given, one will be generated.
         */
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        Clip( Media *parent, qint64 begin = 0, qint64 end = -1, const QString &uuid = QString() );
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        /**
         *  \brief  Clones a Clip, potentially with a new begin and end.
         *
         *  \param  creator The clip to clone.
         *  \param  begin   The clip beginning (in frames, from the parent's beginning).
         *                  If not given, 0 is assumed.
         *  \param  end     The end, in frames, from the parent's beginning. If not given,
         *                  the end of the parent will be used.
         */
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        Clip( Clip *creator, qint64 begin = -1, qint64 end = -1, const QString& uuid = QString() );
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        virtual ~Clip();
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        /**
         *  \return         The clip beginning, in frame, starting at 0
         */
        qint64              begin() const
        {
            return m_begin;
        }
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        /**
         *  \return         The clip end, in frame, starting at 0.
         */
        qint64              end() const
        {
            return m_end;
        }
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        /**
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            \return         Returns the clip length in frame.
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        */
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        qint64              length() const;
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        /**
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            \return         Returns the clip length in seconds.
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        */
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        qint64              lengthSecond() const;
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        /**
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            \return         Returns the Media that the clip was basep uppon.
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        */
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        Media*              getMedia();
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        const Media*        getMedia() const;
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        Clip                *getParent();
        const Clip          *getParent() const;
        MediaContainer*     getChilds();
        const MediaContainer*     getChilds() const;
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        /**
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            \brief          Returns an unique Uuid for this clip (which is NOT the
                            parent's Uuid).
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            \return         The Clip's Uuid as a QUuid
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        */
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        const QUuid         &uuid() const;
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        void                setUuid( const QUuid &uuid );
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        const QStringList   &metaTags() const;
        void                setMetaTags( const QStringList &tags );
        bool                matchMetaTag( const QString &tag ) const;
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        const QString       &notes() const;
        void                setNotes( const QString &notes );
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        void                computeLength();
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        bool                isRootClip() const;
        Clip*               rootClip();
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        /**
         *  \brief          Clear all the clip subclips recursively.
         */
        void                clear();

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        bool                addSubclip( Clip* clip );
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        void                save( QXmlStreamWriter& project );

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        /**
         *  \brief          Generates a full Clip id
         *
         *  A full id is the list of all the parent Clip's UUID, separated by '/'
         *  IE, {uuid1}/{uuid2}/{uuid2}/{current-clip-uuid}
         *  \return     The full Clip id.
         */
        QString             fullId() const;

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        /**
         *  \return         true if the clip is a child of the given clip uuid
         */
        bool                isChild( const QUuid& uuid ) const;

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    private:
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        Media               *m_media;
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        /**
         *  \brief  This represents the beginning of the Clip in frames, from the
         *          beginning of the parent Media.
         */
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        qint64              m_begin;
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        /**
         *  \brief  This represents the end of the Clip in frames, from the
         *          beginning of the parent Media.
         */
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        qint64              m_end;
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        /**
         *  \brief  The length in frames
         */
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        qint64              m_length;
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        /**
         *  \brief  The length in seconds (Be carreful, VLC uses MILLIseconds)
         */
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        qint64              m_lengthSeconds;
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        /**
         *  The Clip's timeline UUID. Used to identify the Clip in the
         *  timeline, as a unique object, even if this clip is present more than
         *  once.
         */
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        QUuid               m_uuid;
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        QStringList         m_metaTags;
        QString             m_notes;
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        /**
         *  \brief          Return the root clip.
         *
         *  The root clip is the base clip for the parent media.
         */
        Clip*               m_rootClip;

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        MediaContainer*     m_childs;

        Clip*               m_parent;

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    private slots:
        void                mediaMetadataUpdated( const Media* media );

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    signals:
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        /**
         *  \brief          Act just like QObject::destroyed(), but before the clip deletion.
         */
        void                unloaded( Clip* );
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        friend class    ClipHelper;
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};

#endif //CLIP_H__