流媒体/Mpeg4/MP4

开发平台：
MultiPlatform

Ap4MoovAtom.cpp：源码内容
							/*****************************************************************
|
|    AP4 - moov 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.
|
 ****************************************************************/
/*----------------------------------------------------------------------
|   includes
+---------------------------------------------------------------------*/
#include "Ap4MoovAtom.h"
#include "Ap4TrakAtom.h"
#include "Ap4AtomFactory.h"
/*----------------------------------------------------------------------
|   AP4_TrakAtomCollector
+---------------------------------------------------------------------*/
class AP4_TrakAtomCollector : public AP4_List<AP4_Atom>::Item::Operator
{
public:
    AP4_TrakAtomCollector(AP4_List<AP4_TrakAtom>* track_atoms) :
        m_TrakAtoms(track_atoms) {}
    AP4_Result Action(AP4_Atom* atom) const {
        if (atom->GetType() == AP4_ATOM_TYPE_TRAK) {
            AP4_TrakAtom* trak = dynamic_cast<AP4_TrakAtom*>(atom);
            if (trak) {
                m_TrakAtoms->Add(trak);
            }
        }
        return AP4_SUCCESS;
    }
private:
    AP4_List<AP4_TrakAtom>* m_TrakAtoms;
};
/*----------------------------------------------------------------------
|   AP4_MoovAtom::AP4_MoovAtom
+---------------------------------------------------------------------*/
AP4_MoovAtom::AP4_MoovAtom() :
    AP4_ContainerAtom(AP4_ATOM_TYPE_MOOV),
    m_TimeScale(0)
{
}
/*----------------------------------------------------------------------
|   AP4_MoovAtom::AP4_MoovAtom
+---------------------------------------------------------------------*/
AP4_MoovAtom::AP4_MoovAtom(AP4_UI32         size,
                           AP4_ByteStream&  stream,
                           AP4_AtomFactory& atom_factory) :
    AP4_ContainerAtom(AP4_ATOM_TYPE_MOOV, size, stream, atom_factory),
    m_TimeScale(0)
{
    // collect all trak atoms
    m_Children.Apply(AP4_TrakAtomCollector(&m_TrakAtoms));    
}
/*----------------------------------------------------------------------
|   AP4_MoovAtom::AdjustChunkOffsets
+---------------------------------------------------------------------*/
AP4_Result 
AP4_MoovAtom::AdjustChunkOffsets(AP4_SI64 offset)
{
    for (AP4_List<AP4_TrakAtom>::Item* item = m_TrakAtoms.FirstItem();
         item;
         item = item->GetNext()) {
        AP4_TrakAtom* trak = item->GetData();
        trak->AdjustChunkOffsets(offset);
    }
    return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
|   AP4_MoovAtom::OnChildAdded
+---------------------------------------------------------------------*/
void
AP4_MoovAtom::OnChildAdded(AP4_Atom* atom)
{
    // keep the atom in the list of trak atoms
    if (atom->GetType() == AP4_ATOM_TYPE_TRAK) {
        AP4_TrakAtom* trak = dynamic_cast<AP4_TrakAtom*>(atom);
        if (trak) {
            m_TrakAtoms.Add(trak);
        }
    }
    // call the base class implementation
    AP4_ContainerAtom::OnChildAdded(atom);
}
/*----------------------------------------------------------------------
|   AP4_MoovAtom::OnChildRemoved
+---------------------------------------------------------------------*/
void
AP4_MoovAtom::OnChildRemoved(AP4_Atom* atom)
{
    // remove the atom from the list of trak atoms
    if (atom->GetType() == AP4_ATOM_TYPE_TRAK) {
        AP4_TrakAtom* trak = dynamic_cast<AP4_TrakAtom*>(atom);
        if (trak) {
            m_TrakAtoms.Remove(trak);
        }
    }
    // call the base class implementation
    AP4_ContainerAtom::OnChildRemoved(atom);
}

						