mirror of
https://github.com/axiomatic-systems/Bento4.git
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140 lines
5.3 KiB
C++
140 lines
5.3 KiB
C++
/*****************************************************************
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| AP4 - ohdr 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 "Ap4Utils.h"
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#include "Ap4GrpiAtom.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_GrpiAtom)
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/*----------------------------------------------------------------------
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| AP4_GrpiAtom::Create
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+---------------------------------------------------------------------*/
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AP4_GrpiAtom*
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AP4_GrpiAtom::Create(AP4_Size size, AP4_ByteStream& stream)
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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_GrpiAtom(size, version, flags, stream);
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}
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/*----------------------------------------------------------------------
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| AP4_GrpiAtom::AP4_GrpiAtom
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+---------------------------------------------------------------------*/
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AP4_GrpiAtom::AP4_GrpiAtom(AP4_UI08 key_encryption_method,
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const char* group_id,
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const AP4_UI08* group_key,
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AP4_Size group_key_length) :
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AP4_Atom(AP4_ATOM_TYPE_GRPI, AP4_FULL_ATOM_HEADER_SIZE, 0, 0),
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m_KeyEncryptionMethod(key_encryption_method),
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m_GroupId(group_id),
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m_GroupKey(group_key, group_key_length)
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{
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m_Size32 += 2+1+2+m_GroupId.GetLength()+group_key_length;
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}
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/*----------------------------------------------------------------------
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| AP4_GrpiAtom::AP4_GrpiAtom
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+---------------------------------------------------------------------*/
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AP4_GrpiAtom::AP4_GrpiAtom(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_Atom(AP4_ATOM_TYPE_GRPI, size, false, version, flags),
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m_KeyEncryptionMethod(0)
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{
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// group id length
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AP4_UI16 group_id_length = 0;
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stream.ReadUI16(group_id_length);
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// encryption method
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stream.ReadUI08(m_KeyEncryptionMethod);
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// group key length
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AP4_UI16 group_key_length = 0;
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stream.ReadUI16(group_key_length);
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// group id
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char* group_id = new char[group_id_length];
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stream.Read(group_id, group_id_length);
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m_GroupId.Assign(group_id, group_id_length);
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delete[] group_id;
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// group key
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m_GroupKey.SetDataSize(group_key_length);
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stream.Read(m_GroupKey.UseData(), group_key_length);
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}
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/*----------------------------------------------------------------------
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| AP4_GrpiAtom::WriteFields
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+---------------------------------------------------------------------*/
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AP4_Result
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AP4_GrpiAtom::WriteFields(AP4_ByteStream& stream)
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{
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AP4_CHECK(stream.WriteUI16((AP4_UI16)m_GroupId.GetLength()));
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AP4_CHECK(stream.WriteUI08(m_KeyEncryptionMethod));
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AP4_CHECK(stream.WriteUI16((AP4_UI16)m_GroupKey.GetDataSize()));
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AP4_CHECK(stream.Write(m_GroupId.GetChars(), m_GroupId.GetLength()));
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AP4_CHECK(stream.Write(m_GroupKey.GetData(), m_GroupKey.GetDataSize()));
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return AP4_SUCCESS;
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}
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/*----------------------------------------------------------------------
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| AP4_GrpiAtom::InspectFields
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+---------------------------------------------------------------------*/
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AP4_Result
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AP4_GrpiAtom::InspectFields(AP4_AtomInspector& inspector)
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{
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inspector.AddField("key encryption method", m_KeyEncryptionMethod);
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inspector.AddField("group id", m_GroupId.GetChars());
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inspector.AddField("group key", m_GroupKey.GetData(),
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m_GroupKey.GetDataSize());
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return AP4_SUCCESS;
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}
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/*----------------------------------------------------------------------
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| AP4_GrpiAtom::Clone
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+---------------------------------------------------------------------*/
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AP4_Atom*
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AP4_GrpiAtom::Clone()
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{
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return new AP4_GrpiAtom(m_KeyEncryptionMethod,
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m_GroupId.GetChars(),
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m_GroupKey.GetData(),
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m_GroupKey.GetDataSize());
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}
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