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|
/*****************************************************************
|
| AP4 - mehd 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 "Ap4MehdAtom.h"
#include "Ap4AtomFactory.h"
#include "Ap4Utils.h"
/*----------------------------------------------------------------------
| dynamic cast support
+---------------------------------------------------------------------*/
AP4_DEFINE_DYNAMIC_CAST_ANCHOR(AP4_MehdAtom)
/*----------------------------------------------------------------------
| AP4_MehdAtom::Create
+---------------------------------------------------------------------*/
AP4_MehdAtom*
AP4_MehdAtom::Create(AP4_Size size, AP4_ByteStream& stream)
{
AP4_UI08 version;
AP4_UI32 flags;
if (AP4_FAILED(AP4_Atom::ReadFullHeader(stream, version, flags))) return NULL;
if (version > 1) return NULL;
return new AP4_MehdAtom(size, version, flags, stream);
}
/*----------------------------------------------------------------------
| AP4_MehdAtom::AP4_MehdAtom
+---------------------------------------------------------------------*/
AP4_MehdAtom::AP4_MehdAtom(AP4_UI64 duration) :
AP4_Atom(AP4_ATOM_TYPE_MEHD, AP4_FULL_ATOM_HEADER_SIZE+4, 0, 0),
m_Duration(duration)
{
if (duration > 0xFFFFFFFF) {
m_Version = 1;
m_Size32 += 4;
}
}
/*----------------------------------------------------------------------
| AP4_MehdAtom::AP4_MehdAtom
+---------------------------------------------------------------------*/
AP4_MehdAtom::AP4_MehdAtom(AP4_UI32 size,
AP4_UI08 version,
AP4_UI32 flags,
AP4_ByteStream& stream) :
AP4_Atom(AP4_ATOM_TYPE_MEHD, size, version, flags)
{
if (m_Version == 0) {
AP4_UI32 duration;
stream.ReadUI32(duration);
m_Duration = duration;
} else {
stream.ReadUI64(m_Duration);
}
}
/*----------------------------------------------------------------------
| AP4_MehdAtom::WriteFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_MehdAtom::WriteFields(AP4_ByteStream& stream)
{
if (m_Version == 0) {
return stream.WriteUI32((AP4_UI32)m_Duration);
} else {
return stream.WriteUI64(m_Duration);
}
}
/*----------------------------------------------------------------------
| AP4_MehdAtom::InspectFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_MehdAtom::InspectFields(AP4_AtomInspector& inspector)
{
inspector.AddField("duration", m_Duration);
return AP4_SUCCESS;
}
|
