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https://github.com/axiomatic-systems/Bento4.git
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107 lines
3.9 KiB
C++
107 lines
3.9 KiB
C++
/*****************************************************************
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| AP4 - dref 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 "Ap4DrefAtom.h"
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#include "Ap4AtomFactory.h"
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#include "Ap4Utils.h"
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#include "Ap4ContainerAtom.h"
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/*----------------------------------------------------------------------
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| AP4_DrefAtom::Create
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+---------------------------------------------------------------------*/
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AP4_DrefAtom*
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AP4_DrefAtom::Create(AP4_UI32 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_DrefAtom(size, version, flags, stream, atom_factory);
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}
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/*----------------------------------------------------------------------
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| AP4_DrefAtom::AP4_DrefAtom
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+---------------------------------------------------------------------*/
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AP4_DrefAtom::AP4_DrefAtom(AP4_Atom** refs, AP4_Cardinal refs_count) :
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AP4_ContainerAtom(AP4_ATOM_TYPE_DREF, (AP4_UI32)0, (AP4_UI32)0)
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{
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m_Size32 += 4;
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for (unsigned i=0; i<refs_count; i++) {
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m_Children.Add(refs[i]);
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m_Size32 += (AP4_UI32)refs[i]->GetSize();
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}
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}
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/*----------------------------------------------------------------------
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| AP4_DrefAtom::AP4_DrefAtom
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+---------------------------------------------------------------------*/
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AP4_DrefAtom::AP4_DrefAtom(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_DREF, size, false, version, flags)
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{
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// read the number of entries
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AP4_UI32 entry_count;
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stream.ReadUI32(entry_count);
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// read children
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AP4_LargeSize bytes_available = size-AP4_FULL_ATOM_HEADER_SIZE-4;
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while (entry_count--) {
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AP4_Atom* atom;
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while (AP4_SUCCEEDED(atom_factory.CreateAtomFromStream(stream,
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bytes_available,
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atom))) {
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m_Children.Add(atom);
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}
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}
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}
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/*----------------------------------------------------------------------
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| AP4_DrefAtom::WriteFields
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+---------------------------------------------------------------------*/
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AP4_Result
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AP4_DrefAtom::WriteFields(AP4_ByteStream& stream)
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{
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AP4_Result result;
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// write the number of entries
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result = stream.WriteUI32(m_Children.ItemCount());
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if (AP4_FAILED(result)) return result;
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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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