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|
/*****************************************************************
|
| AP4 - odhe Atoms
|
| Copyright 2002-2008 Axiomatic Systems, LLC
|
|
| 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 "Ap4Utils.h"
#include "Ap4OdheAtom.h"
#include "Ap4OhdrAtom.h"
/*----------------------------------------------------------------------
| dynamic cast support
+---------------------------------------------------------------------*/
AP4_DEFINE_DYNAMIC_CAST_ANCHOR(AP4_OdheAtom)
/*----------------------------------------------------------------------
| AP4_OdheAtom::Create
+---------------------------------------------------------------------*/
AP4_OdheAtom*
AP4_OdheAtom::Create(AP4_Size size,
AP4_ByteStream& stream,
AP4_AtomFactory& atom_factory)
{
AP4_UI08 version;
AP4_UI32 flags;
if (AP4_FAILED(AP4_Atom::ReadFullHeader(stream, version, flags))) return NULL;
if (version != 0) return NULL;
return new AP4_OdheAtom(size, version, flags, stream, atom_factory);
}
/*----------------------------------------------------------------------
| AP4_OdheAtom::AP4_OdheAtom
+---------------------------------------------------------------------*/
AP4_OdheAtom::AP4_OdheAtom(AP4_UI32 size,
AP4_UI08 version,
AP4_UI32 flags,
AP4_ByteStream& stream,
AP4_AtomFactory& atom_factory) :
AP4_ContainerAtom(AP4_ATOM_TYPE_ODHE, size, false, version, flags)
{
// read the content type
AP4_UI08 content_type_length;
stream.ReadUI08(content_type_length);
char content_type[256];
stream.Read(content_type, content_type_length);
m_ContentType.Assign(content_type, content_type_length);
// read the children
AP4_Size bytes_available = size-(AP4_FULL_ATOM_HEADER_SIZE+1+content_type_length);
ReadChildren(atom_factory, stream, bytes_available);
}
/*----------------------------------------------------------------------
| AP4_OdheAtom::AP4_OdheAtom
+---------------------------------------------------------------------*/
AP4_OdheAtom::AP4_OdheAtom(const char* content_type,
AP4_OhdrAtom* ohdr) :
AP4_ContainerAtom(AP4_ATOM_TYPE_ODHE, (AP4_UI32)0, (AP4_UI32)0),
m_ContentType(content_type)
{
m_Size32 += 1+m_ContentType.GetLength();
AddChild(ohdr);
}
/*----------------------------------------------------------------------
| AP4_OdheAtom::WriteFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_OdheAtom::WriteFields(AP4_ByteStream& stream)
{
// write the content type
AP4_CHECK(stream.WriteUI08((AP4_UI08)m_ContentType.GetLength()));
if (m_ContentType.GetLength()) {
AP4_CHECK(stream.Write(m_ContentType.GetChars(), m_ContentType.GetLength()));
}
// write the children
return m_Children.Apply(AP4_AtomListWriter(stream));
}
/*----------------------------------------------------------------------
| AP4_OdheAtom::InspectFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_OdheAtom::InspectFields(AP4_AtomInspector& inspector)
{
inspector.AddField("content_type", m_ContentType.GetChars());
return InspectChildren(inspector);
}
/*----------------------------------------------------------------------
| AP4_OdheAtom::OnChildChanged
+---------------------------------------------------------------------*/
void
AP4_OdheAtom::OnChildChanged(AP4_Atom*)
{
// remcompute our size
AP4_UI64 size = GetHeaderSize()+1+m_ContentType.GetLength();
m_Children.Apply(AP4_AtomSizeAdder(size));
SetSize(size);
// update our parent
if (m_Parent) m_Parent->OnChildChanged(this);
}
|
