mirror of
https://github.com/axiomatic-systems/Bento4.git
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275 lines
10 KiB
C++
275 lines
10 KiB
C++
/*****************************************************************
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| AP4 - Container 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 "Ap4Types.h"
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#include "Ap4Atom.h"
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#include "Ap4Utils.h"
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#include "Ap4ContainerAtom.h"
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#include "Ap4AtomFactory.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_ContainerAtom)
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/*----------------------------------------------------------------------
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| AP4_ContainerAtom::AP4_ContainerAtom
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+---------------------------------------------------------------------*/
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AP4_ContainerAtom*
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AP4_ContainerAtom::Create(Type type,
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AP4_UI64 size,
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bool is_full,
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bool force_64,
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AP4_ByteStream& stream,
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AP4_AtomFactory& atom_factory)
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{
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if (is_full) {
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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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// special case for 'meta' atoms, because Apple sometimes creates them as
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// regular (non-full) atoms. This is bogus, but we can try to detect it
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if (type == AP4_ATOM_TYPE_META) {
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AP4_UI32 phantom_size = (version<<24)|flags;
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if (phantom_size >= 8 && size >= 16) {
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// version+flags looks like a size. read the next 4 bytes just
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// to be sure it is a hdlr atom
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AP4_UI32 peek;
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if (AP4_FAILED(stream.ReadUI32(peek))) return NULL;
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if (peek == AP4_ATOM_TYPE_HDLR) {
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// rewind the stream by 8 bytes
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AP4_Position position;
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stream.Tell(position);
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stream.Seek(position-8);
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// create a non-full container
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return new AP4_ContainerAtom(type, size, force_64, stream, atom_factory);
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} else {
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// rewind the stream by 4 bytes
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AP4_Position position;
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stream.Tell(position);
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stream.Seek(position-4);
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}
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}
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}
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return new AP4_ContainerAtom(type, size, force_64, version, flags, stream, atom_factory);
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} else {
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return new AP4_ContainerAtom(type, size, force_64, stream, atom_factory);
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}
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}
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/*----------------------------------------------------------------------
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| AP4_ContainerAtom::AP4_ContainerAtom
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+---------------------------------------------------------------------*/
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AP4_ContainerAtom::AP4_ContainerAtom(Type type) :
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AP4_Atom(type, AP4_ATOM_HEADER_SIZE)
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{
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}
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/*----------------------------------------------------------------------
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| AP4_ContainerAtom::AP4_ContainerAtom
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+---------------------------------------------------------------------*/
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AP4_ContainerAtom::AP4_ContainerAtom(Type type, AP4_UI08 version, AP4_UI32 flags) :
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AP4_Atom(type, AP4_FULL_ATOM_HEADER_SIZE, version, flags)
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{
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}
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/*----------------------------------------------------------------------
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| AP4_ContainerAtom::AP4_ContainerAtom
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+---------------------------------------------------------------------*/
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AP4_ContainerAtom::AP4_ContainerAtom(Type type, AP4_UI64 size, bool force_64) :
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AP4_Atom(type, size, force_64)
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{
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}
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/*----------------------------------------------------------------------
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| AP4_ContainerAtom::AP4_ContainerAtom
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+---------------------------------------------------------------------*/
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AP4_ContainerAtom::AP4_ContainerAtom(Type type,
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AP4_UI64 size,
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bool force_64,
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AP4_UI08 version,
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AP4_UI32 flags) :
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AP4_Atom(type, size, force_64, version, flags)
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{
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}
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/*----------------------------------------------------------------------
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| AP4_ContainerAtom::AP4_ContainerAtom
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+---------------------------------------------------------------------*/
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AP4_ContainerAtom::AP4_ContainerAtom(Type type,
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AP4_UI64 size,
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bool force_64,
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AP4_ByteStream& stream,
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AP4_AtomFactory& atom_factory) :
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AP4_Atom(type, size, force_64)
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{
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ReadChildren(atom_factory, stream, size-GetHeaderSize());
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}
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/*----------------------------------------------------------------------
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| AP4_ContainerAtom::AP4_ContainerAtom
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+---------------------------------------------------------------------*/
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AP4_ContainerAtom::AP4_ContainerAtom(Type type,
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AP4_UI64 size,
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bool force_64,
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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_Atom(type, size, force_64, version, flags)
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{
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ReadChildren(atom_factory, stream, size-GetHeaderSize());
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}
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/*----------------------------------------------------------------------
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| AP4_ContainerAtom::Clone
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+---------------------------------------------------------------------*/
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AP4_Atom*
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AP4_ContainerAtom::Clone()
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{
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AP4_ContainerAtom* clone;
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if (m_IsFull) {
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clone = new AP4_ContainerAtom(m_Type, m_Version, m_Flags);
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} else {
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clone = new AP4_ContainerAtom(m_Type);
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}
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AP4_List<AP4_Atom>::Item* child_item = m_Children.FirstItem();
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while (child_item) {
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AP4_Atom* child_clone = child_item->GetData()->Clone();
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if (child_clone) clone->AddChild(child_clone);
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child_item = child_item->GetNext();
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}
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return clone;
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}
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/*----------------------------------------------------------------------
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| AP4_ContainerAtom::ReadChildren
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+---------------------------------------------------------------------*/
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void
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AP4_ContainerAtom::ReadChildren(AP4_AtomFactory& atom_factory,
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AP4_ByteStream& stream,
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AP4_UI64 size)
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{
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AP4_Atom* atom;
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AP4_LargeSize bytes_available = size;
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// save and switch the factory's context
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atom_factory.PushContext(m_Type);
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while (AP4_SUCCEEDED(
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atom_factory.CreateAtomFromStream(stream, bytes_available, atom))) {
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atom->SetParent(this);
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m_Children.Add(atom);
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}
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// restore the saved context
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atom_factory.PopContext();
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}
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/*----------------------------------------------------------------------
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| AP4_ContainerAtom::InspectFields
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+---------------------------------------------------------------------*/
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AP4_Result
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AP4_ContainerAtom::InspectFields(AP4_AtomInspector& inspector)
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{
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return InspectChildren(inspector);
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}
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/*----------------------------------------------------------------------
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| AP4_ContainerAtom::InspectChildren
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+---------------------------------------------------------------------*/
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AP4_Result
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AP4_ContainerAtom::InspectChildren(AP4_AtomInspector& inspector)
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{
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// inspect children
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m_Children.Apply(AP4_AtomListInspector(inspector));
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return AP4_SUCCESS;
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}
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/*----------------------------------------------------------------------
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| AP4_ContainerAtom::WriteFields
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+---------------------------------------------------------------------*/
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AP4_Result
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AP4_ContainerAtom::WriteFields(AP4_ByteStream& stream)
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{
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// write all 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_ContainerAtom::OnChildChanged
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+---------------------------------------------------------------------*/
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void
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AP4_ContainerAtom::OnChildChanged(AP4_Atom*)
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{
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// remcompute our size
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AP4_UI64 size = GetHeaderSize();
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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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/*----------------------------------------------------------------------
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| AP4_ContainerAtom::OnChildAdded
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+---------------------------------------------------------------------*/
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void
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AP4_ContainerAtom::OnChildAdded(AP4_Atom* child)
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{
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// update our size
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SetSize(GetSize()+child->GetSize());
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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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/*----------------------------------------------------------------------
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| AP4_ContainerAtom::OnChildRemoved
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+---------------------------------------------------------------------*/
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void
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AP4_ContainerAtom::OnChildRemoved(AP4_Atom* child)
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{
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// update our size
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SetSize(GetSize()-child->GetSize());
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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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