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|
/*****************************************************************
|
| AP4 - ohdr 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 "Ap4GrpiAtom.h"
/*----------------------------------------------------------------------
| dynamic cast support
+---------------------------------------------------------------------*/
AP4_DEFINE_DYNAMIC_CAST_ANCHOR(AP4_GrpiAtom)
/*----------------------------------------------------------------------
| AP4_GrpiAtom::Create
+---------------------------------------------------------------------*/
AP4_GrpiAtom*
AP4_GrpiAtom::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_GrpiAtom(size, version, flags, stream);
}
/*----------------------------------------------------------------------
| AP4_GrpiAtom::AP4_GrpiAtom
+---------------------------------------------------------------------*/
AP4_GrpiAtom::AP4_GrpiAtom(AP4_UI08 key_encryption_method,
const char* group_id,
const AP4_UI08* group_key,
AP4_Size group_key_length) :
AP4_Atom(AP4_ATOM_TYPE_GRPI, AP4_FULL_ATOM_HEADER_SIZE, 0, 0),
m_KeyEncryptionMethod(key_encryption_method),
m_GroupId(group_id),
m_GroupKey(group_key, group_key_length)
{
m_Size32 += 2+1+2+m_GroupId.GetLength()+group_key_length;
}
/*----------------------------------------------------------------------
| AP4_GrpiAtom::AP4_GrpiAtom
+---------------------------------------------------------------------*/
AP4_GrpiAtom::AP4_GrpiAtom(AP4_UI32 size,
AP4_UI08 version,
AP4_UI32 flags,
AP4_ByteStream& stream) :
AP4_Atom(AP4_ATOM_TYPE_GRPI, size, false, version, flags),
m_KeyEncryptionMethod(0)
{
// group id length
AP4_UI16 group_id_length = 0;
stream.ReadUI16(group_id_length);
// encryption method
stream.ReadUI08(m_KeyEncryptionMethod);
// group key length
AP4_UI16 group_key_length = 0;
stream.ReadUI16(group_key_length);
// group id
char* group_id = new char[group_id_length];
stream.Read(group_id, group_id_length);
m_GroupId.Assign(group_id, group_id_length);
delete[] group_id;
// group key
m_GroupKey.SetDataSize(group_key_length);
stream.Read(m_GroupKey.UseData(), group_key_length);
}
/*----------------------------------------------------------------------
| AP4_GrpiAtom::WriteFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_GrpiAtom::WriteFields(AP4_ByteStream& stream)
{
AP4_CHECK(stream.WriteUI16((AP4_UI16)m_GroupId.GetLength()));
AP4_CHECK(stream.WriteUI08(m_KeyEncryptionMethod));
AP4_CHECK(stream.WriteUI16((AP4_UI16)m_GroupKey.GetDataSize()));
AP4_CHECK(stream.Write(m_GroupId.GetChars(), m_GroupId.GetLength()));
AP4_CHECK(stream.Write(m_GroupKey.GetData(), m_GroupKey.GetDataSize()));
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_GrpiAtom::InspectFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_GrpiAtom::InspectFields(AP4_AtomInspector& inspector)
{
inspector.AddField("key encryption method", m_KeyEncryptionMethod);
inspector.AddField("group id", m_GroupId.GetChars());
inspector.AddField("group key", m_GroupKey.GetData(),
m_GroupKey.GetDataSize());
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_GrpiAtom::Clone
+---------------------------------------------------------------------*/
AP4_Atom*
AP4_GrpiAtom::Clone()
{
return new AP4_GrpiAtom(m_KeyEncryptionMethod,
m_GroupId.GetChars(),
m_GroupKey.GetData(),
m_GroupKey.GetDataSize());
}
|
