mirror of
https://github.com/axiomatic-systems/Bento4.git
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132 lines
4.8 KiB
C++
132 lines
4.8 KiB
C++
/*****************************************************************
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| AP4 - odhe Atoms
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| Copyright 2002-2008 Axiomatic Systems, LLC
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| This file is part of Bento4/AP4 (MP4 Atom Processing Library).
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| Unless you have obtained Bento4 under a difference license,
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| this version of Bento4 is Bento4|GPL.
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| Bento4|GPL is free software; you can redistribute it and/or modify
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| it under the terms of the GNU General Public License as published by
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| the Free Software Foundation; either version 2, or (at your option)
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| any later version.
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| Bento4|GPL is distributed in the hope that it will be useful,
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| but WITHOUT ANY WARRANTY; without even the implied warranty of
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| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| GNU General Public License for more details.
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| You should have received a copy of the GNU General Public License
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| along with Bento4|GPL; see the file COPYING. If not, write to the
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| Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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| 02111-1307, USA.
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****************************************************************/
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/*----------------------------------------------------------------------
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| includes
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+---------------------------------------------------------------------*/
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#include "Ap4Utils.h"
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#include "Ap4OdheAtom.h"
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#include "Ap4OhdrAtom.h"
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/*----------------------------------------------------------------------
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| dynamic cast support
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+---------------------------------------------------------------------*/
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AP4_DEFINE_DYNAMIC_CAST_ANCHOR(AP4_OdheAtom)
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/*----------------------------------------------------------------------
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| AP4_OdheAtom::Create
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+---------------------------------------------------------------------*/
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AP4_OdheAtom*
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AP4_OdheAtom::Create(AP4_Size size,
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AP4_ByteStream& stream,
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AP4_AtomFactory& atom_factory)
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{
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AP4_UI08 version;
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AP4_UI32 flags;
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if (size < AP4_FULL_ATOM_HEADER_SIZE) return NULL;
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if (AP4_FAILED(AP4_Atom::ReadFullHeader(stream, version, flags))) return NULL;
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if (version != 0) return NULL;
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return new AP4_OdheAtom(size, version, flags, stream, atom_factory);
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}
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/*----------------------------------------------------------------------
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| AP4_OdheAtom::AP4_OdheAtom
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+---------------------------------------------------------------------*/
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AP4_OdheAtom::AP4_OdheAtom(AP4_UI32 size,
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AP4_UI08 version,
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AP4_UI32 flags,
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AP4_ByteStream& stream,
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AP4_AtomFactory& atom_factory) :
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AP4_ContainerAtom(AP4_ATOM_TYPE_ODHE, size, false, version, flags)
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{
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// read the content type
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AP4_UI08 content_type_length;
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stream.ReadUI08(content_type_length);
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char content_type[256];
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stream.Read(content_type, content_type_length);
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m_ContentType.Assign(content_type, content_type_length);
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// read the children
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AP4_Size bytes_available = size-(AP4_FULL_ATOM_HEADER_SIZE+1+content_type_length);
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ReadChildren(atom_factory, stream, bytes_available);
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}
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/*----------------------------------------------------------------------
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| AP4_OdheAtom::AP4_OdheAtom
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+---------------------------------------------------------------------*/
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AP4_OdheAtom::AP4_OdheAtom(const char* content_type,
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AP4_OhdrAtom* ohdr) :
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AP4_ContainerAtom(AP4_ATOM_TYPE_ODHE, (AP4_UI32)0, (AP4_UI32)0),
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m_ContentType(content_type)
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{
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m_Size32 += 1+m_ContentType.GetLength();
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AddChild(ohdr);
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}
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/*----------------------------------------------------------------------
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| AP4_OdheAtom::WriteFields
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+---------------------------------------------------------------------*/
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AP4_Result
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AP4_OdheAtom::WriteFields(AP4_ByteStream& stream)
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{
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// write the content type
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AP4_CHECK(stream.WriteUI08((AP4_UI08)m_ContentType.GetLength()));
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if (m_ContentType.GetLength()) {
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AP4_CHECK(stream.Write(m_ContentType.GetChars(), m_ContentType.GetLength()));
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}
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// write the children
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return m_Children.Apply(AP4_AtomListWriter(stream));
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}
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/*----------------------------------------------------------------------
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| AP4_OdheAtom::InspectFields
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+---------------------------------------------------------------------*/
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AP4_Result
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AP4_OdheAtom::InspectFields(AP4_AtomInspector& inspector)
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{
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inspector.AddField("content_type", m_ContentType.GetChars());
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return InspectChildren(inspector);
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}
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/*----------------------------------------------------------------------
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| AP4_OdheAtom::OnChildChanged
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+---------------------------------------------------------------------*/
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void
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AP4_OdheAtom::OnChildChanged(AP4_Atom*)
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{
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// remcompute our size
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AP4_UI64 size = GetHeaderSize()+1+m_ContentType.GetLength();
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m_Children.Apply(AP4_AtomSizeAdder(size));
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SetSize(size);
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// update our parent
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if (m_Parent) m_Parent->OnChildChanged(this);
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}
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