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|
/*****************************************************************
|
| AP4 - hdlr 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 "Ap4HdlrAtom.h"
#include "Ap4AtomFactory.h"
#include "Ap4Utils.h"
/*----------------------------------------------------------------------
| dynamic cast support
+---------------------------------------------------------------------*/
AP4_DEFINE_DYNAMIC_CAST_ANCHOR(AP4_HdlrAtom)
/*----------------------------------------------------------------------
| AP4_HdlrAtom::Create
+---------------------------------------------------------------------*/
AP4_HdlrAtom*
AP4_HdlrAtom::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_HdlrAtom(size, version, flags, stream);
}
/*----------------------------------------------------------------------
| AP4_HdlrAtom::AP4_HdlrAtom
+---------------------------------------------------------------------*/
AP4_HdlrAtom::AP4_HdlrAtom(AP4_Atom::Type hdlr_type, const char* hdlr_name) :
AP4_Atom(AP4_ATOM_TYPE_HDLR, AP4_FULL_ATOM_HEADER_SIZE, 0, 0),
m_HandlerType(hdlr_type),
m_HandlerName(hdlr_name)
{
m_Size32 += 20+m_HandlerName.GetLength()+1;
m_Reserved[0] = m_Reserved[1] = m_Reserved[2] = 0;
}
/*----------------------------------------------------------------------
| AP4_HdlrAtom::AP4_HdlrAtom
+---------------------------------------------------------------------*/
AP4_HdlrAtom::AP4_HdlrAtom(AP4_UI32 size,
AP4_UI08 version,
AP4_UI32 flags,
AP4_ByteStream& stream) :
AP4_Atom(AP4_ATOM_TYPE_HDLR, size, version, flags)
{
AP4_UI32 predefined;
stream.ReadUI32(predefined);
stream.ReadUI32(m_HandlerType);
stream.ReadUI32(m_Reserved[0]);
stream.ReadUI32(m_Reserved[1]);
stream.ReadUI32(m_Reserved[2]);
// read the name unless it is empty
int name_size = size-(AP4_FULL_ATOM_HEADER_SIZE+20);
if (name_size == 0) return;
char* name = new char[name_size+1];
stream.Read(name, name_size);
name[name_size] = '\0'; // force a null termination
// handle a special case: the Quicktime files have a pascal
// string here, but ISO MP4 files have a C string.
// we try to detect a pascal encoding and correct it.
if (name[0] == name_size-1) {
m_HandlerName = name+1;
} else {
m_HandlerName = name;
}
delete[] name;
}
/*----------------------------------------------------------------------
| AP4_HdlrAtom::WriteFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_HdlrAtom::WriteFields(AP4_ByteStream& stream)
{
AP4_Result result;
// write the data
result = stream.WriteUI32(0); // predefined
if (AP4_FAILED(result)) return result;
result = stream.WriteUI32(m_HandlerType);
if (AP4_FAILED(result)) return result;
result = stream.WriteUI32(m_Reserved[0]);
if (AP4_FAILED(result)) return result;
result = stream.WriteUI32(m_Reserved[1]);
if (AP4_FAILED(result)) return result;
result = stream.WriteUI32(m_Reserved[2]);
if (AP4_FAILED(result)) return result;
AP4_UI08 name_size = (AP4_UI08)m_HandlerName.GetLength();
if (AP4_FULL_ATOM_HEADER_SIZE+20+name_size > m_Size32) {
name_size = (AP4_UI08)(m_Size32-AP4_FULL_ATOM_HEADER_SIZE+20);
}
if (name_size) {
result = stream.Write(m_HandlerName.GetChars(), name_size);
if (AP4_FAILED(result)) return result;
}
// pad with zeros if necessary
AP4_Size padding = m_Size32-(AP4_FULL_ATOM_HEADER_SIZE+20+name_size);
while (padding--) stream.WriteUI08(0);
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_HdlrAtom::InspectFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_HdlrAtom::InspectFields(AP4_AtomInspector& inspector)
{
char type[5];
AP4_FormatFourChars(type, m_HandlerType);
inspector.AddField("handler_type", type);
inspector.AddField("handler_name", m_HandlerName.GetChars());
return AP4_SUCCESS;
}
|
