Ap4TkhdAtom.h

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/*****************************************************************
|
|    AP4 - tkhd Atoms 
|
|    Copyright 2002-2006 Gilles Boccon-Gibod & Julien Boeuf
|
|
|    This file is part of Bento4/AP4 (MP4 Atom Processing Library).
|
|    Unless you have obtained Bento4 under a difference license,
|    this version of Bento4 is Bento4|GPL.
|    Bento4|GPL 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, or (at your option)
|    any later version.
|
|    Bento4|GPL 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 Bento4|GPL; see the file COPYING.  If not, write to the
|    Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
|    02111-1307, USA.
|
 ****************************************************************/

#ifndef _AP4_TKHD_ATOM_H_
#define _AP4_TKHD_ATOM_H_

/*----------------------------------------------------------------------
|   includes
+---------------------------------------------------------------------*/
#include "Ap4Atom.h"

/*----------------------------------------------------------------------
|   constants
+---------------------------------------------------------------------*/
const int AP4_TKHD_FLAG_TRACK_ENABLED    = 1;
const int AP4_TKHD_FLAG_TRACK_IN_MOVIE   = 2;
const int AP4_TKHD_FLAG_TRACK_IN_PREVIEW = 4;

const int AP4_TKHD_FLAG_DEFAULTS         = 7;

/*----------------------------------------------------------------------
|   AP4_TkhdAtom
+---------------------------------------------------------------------*/
class AP4_TkhdAtom : public AP4_Atom
{
public:
    // class methods
    static AP4_TkhdAtom* Create(AP4_Size size, AP4_ByteStream& stream);

    // methods
    AP4_TkhdAtom(AP4_UI32 creation_time,
                 AP4_UI32 modification_time,
                 AP4_UI32 track_id,
                 AP4_UI32 duration,
                 AP4_UI16 volume,
                 AP4_UI32 width,
                 AP4_UI32 height);    
    virtual AP4_Result InspectFields(AP4_AtomInspector& inspector);
    virtual AP4_Result WriteFields(AP4_ByteStream& stream);

    AP4_UI32   GetDuration() { return m_Duration; }
    AP4_Result SetDuration(AP4_UI32 duration) {
        m_Duration = duration;
        return AP4_SUCCESS;
    }
    AP4_UI32   GetTrackId()  { return m_TrackId;  }
    AP4_Result SetTrackId(AP4_UI32 track_id)  { 
        m_TrackId = track_id;
        return AP4_SUCCESS;  
    }

    void GetTranslation(AP4_Float& x, AP4_Float& y) {
        x = (AP4_Float)(*(int*)&m_Matrix[6]) / 65536;
        y = (AP4_Float)(*(int*)&m_Matrix[7]) / 65536;
    }

    AP4_UI32 GetWidth()  { return m_Width; }
    AP4_UI32 GetHeight() { return m_Height;}

 private:
    // methods
    AP4_TkhdAtom(AP4_UI32        size, 
                 AP4_UI32        version,
                 AP4_UI32        flags,
                 AP4_ByteStream& stream);

    // members
    AP4_UI32 m_CreationTimeH;
    AP4_UI32 m_CreationTime;
    AP4_UI32 m_ModificationTimeH;
    AP4_UI32 m_ModificationTime;
    AP4_UI32 m_TrackId;
    AP4_UI32 m_Reserved1;
    AP4_UI32 m_DurationH;
    AP4_UI32 m_Duration;
    AP4_UI32 m_Reserved2[2];
    AP4_UI16 m_Layer;
    AP4_UI16 m_AlternateGroup;
    AP4_UI16 m_Volume;
    AP4_UI16 m_Reserved3;
    AP4_UI32 m_Matrix[9];
    AP4_UI32 m_Width;
    AP4_UI32 m_Height;
};

#endif // _AP4_TKHD_ATOM_H_

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