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|
/*****************************************************************
|
| AP4 - Ainf Atoms
|
| Copyright 2002-2012 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 "Ap4AinfAtom.h"
#include "Ap4Utils.h"
/*----------------------------------------------------------------------
| AP4_AinfAtom Dynamic Cast Anchor
+---------------------------------------------------------------------*/
AP4_DEFINE_DYNAMIC_CAST_ANCHOR(AP4_AinfAtom)
/*----------------------------------------------------------------------
| constants
+---------------------------------------------------------------------*/
const unsigned int AP4_AINF_MAX_OTHER_SIZE = 16*1024*1024; // 16MB, for sanity
/*----------------------------------------------------------------------
| AP4_AinfAtom::Create
+---------------------------------------------------------------------*/
AP4_AinfAtom*
AP4_AinfAtom::Create(AP4_Size size, AP4_ByteStream& stream)
{
AP4_UI08 version;
AP4_UI32 flags;
if (size < AP4_FULL_ATOM_HEADER_SIZE) return NULL;
if (AP4_FAILED(AP4_Atom::ReadFullHeader(stream, version, flags))) return NULL;
if (version > 1) return NULL;
return new AP4_AinfAtom(size, version, flags, stream);
}
/*----------------------------------------------------------------------
| AP4_AinfAtom::AP4_AinfAtom
+---------------------------------------------------------------------*/
AP4_AinfAtom::AP4_AinfAtom() :
AP4_Atom(AP4_ATOM_TYPE_AINF, AP4_FULL_ATOM_HEADER_SIZE+4+1, 0, 0)
{
}
/*----------------------------------------------------------------------
| AP4_AinfAtom::AP4_AinfAtom
+---------------------------------------------------------------------*/
AP4_AinfAtom::AP4_AinfAtom(AP4_UI32 size,
AP4_UI08 version,
AP4_UI32 flags,
AP4_ByteStream& stream) :
AP4_Atom(AP4_ATOM_TYPE_AINF, size, version, flags)
{
stream.ReadUI32(m_ProfileVersion);
if (size > AP4_FULL_ATOM_HEADER_SIZE+4 && size < AP4_AINF_MAX_OTHER_SIZE) {
AP4_DataBuffer payload;
unsigned int payload_size = size-AP4_FULL_ATOM_HEADER_SIZE-4;
payload.SetDataSize(payload_size+1);
payload.UseData()[payload_size] = 0;
stream.Read(payload.UseData(), payload_size);
m_APID = (const char*)payload.GetData();
if (payload_size > m_APID.GetLength()+1) {
unsigned int other_boxes_size = payload_size-m_APID.GetLength()-1;
m_OtherBoxes.SetDataSize(other_boxes_size);
AP4_CopyMemory(m_OtherBoxes.UseData(), payload.GetData(), other_boxes_size);
}
}
}
/*----------------------------------------------------------------------
| AP4_AinfAtom::WriteFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_AinfAtom::WriteFields(AP4_ByteStream& stream)
{
AP4_Result result;
result = stream.WriteUI32(m_ProfileVersion);
if (AP4_FAILED(result)) return result;
// stop early if we have an atom with no APID and a declared size
// that doesn't leave enough room for the NULL terminator
if (GetSize() <= AP4_FULL_ATOM_HEADER_SIZE+4) return AP4_SUCCESS;
result = stream.Write(m_APID.GetChars(), m_APID.GetLength()+1);
if (AP4_FAILED(result)) return result;
if (m_OtherBoxes.GetDataSize()) {
stream.Write(m_OtherBoxes.GetData(), m_OtherBoxes.GetDataSize());
}
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_AinfAtom::InspectFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_AinfAtom::InspectFields(AP4_AtomInspector& inspector)
{
char v[5];
AP4_FormatFourChars(v, m_ProfileVersion);
v[4] = 0;
inspector.AddField("profile_version", v);
inspector.AddField("APID", m_APID.GetChars());
return AP4_SUCCESS;
}
|
