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|
/*****************************************************************
|
| AP4 - iSFM 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 "Ap4IsfmAtom.h"
/*----------------------------------------------------------------------
| dynamic cast support
+---------------------------------------------------------------------*/
AP4_DEFINE_DYNAMIC_CAST_ANCHOR(AP4_IsfmAtom)
/*----------------------------------------------------------------------
| AP4_IsfmAtom::Create
+---------------------------------------------------------------------*/
AP4_IsfmAtom*
AP4_IsfmAtom::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 != 0) return NULL;
return new AP4_IsfmAtom(size, version, flags, stream);
}
/*----------------------------------------------------------------------
| AP4_IsfmAtom::AP4_IsfmAtom
+---------------------------------------------------------------------*/
AP4_IsfmAtom::AP4_IsfmAtom(bool selective_encryption,
AP4_UI08 key_length_indicator,
AP4_UI08 iv_length) :
AP4_Atom(AP4_ATOM_TYPE_ISFM, AP4_FULL_ATOM_HEADER_SIZE+3, 0, 0),
m_SelectiveEncryption(selective_encryption),
m_KeyIndicatorLength(key_length_indicator),
m_IvLength(iv_length)
{
}
/*----------------------------------------------------------------------
| AP4_IsfmAtom::AP4_IsfmAtom
+---------------------------------------------------------------------*/
AP4_IsfmAtom::AP4_IsfmAtom(AP4_UI32 size,
AP4_UI08 version,
AP4_UI32 flags,
AP4_ByteStream& stream) :
AP4_Atom(AP4_ATOM_TYPE_ISFM, size, version, flags),
m_KeyIndicatorLength(0),
m_IvLength(0)
{
AP4_UI08 s;
stream.ReadUI08(s);
m_SelectiveEncryption = ((s&0x80) != 0);
stream.ReadUI08(m_KeyIndicatorLength);
stream.ReadUI08(m_IvLength);
}
/*----------------------------------------------------------------------
| AP4_IsfmAtom::Clone
+---------------------------------------------------------------------*/
AP4_Atom*
AP4_IsfmAtom::Clone()
{
return new AP4_IsfmAtom(m_SelectiveEncryption,
m_KeyIndicatorLength,
m_IvLength);
}
/*----------------------------------------------------------------------
| AP4_IsfmAtom::WriteFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_IsfmAtom::WriteFields(AP4_ByteStream& stream)
{
AP4_Result result;
// selective encryption
result = stream.WriteUI08(m_SelectiveEncryption ? 0x80 : 0);
if (AP4_FAILED(result)) return result;
// key indicator length
result = stream.WriteUI08(m_KeyIndicatorLength);
if (AP4_FAILED(result)) return result;
// IV length
result = stream.WriteUI08(m_IvLength);
if (AP4_FAILED(result)) return result;
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_IsfmAtom::InspectFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_IsfmAtom::InspectFields(AP4_AtomInspector& inspector)
{
inspector.AddField("selective_encryption", m_SelectiveEncryption);
inspector.AddField("key_indicator_length", m_KeyIndicatorLength);
inspector.AddField("IV_length", m_IvLength);
return AP4_SUCCESS;
}
|
