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Ap4SbgpAtom.cpp
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Ap4SbgpAtom.cpp
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/*****************************************************************
|
| AP4 - sbgp Atoms
|
| Copyright 2002-2014 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 "Ap4SbgpAtom.h"
#include "Ap4Utils.h"
/*----------------------------------------------------------------------
| dynamic cast support
+---------------------------------------------------------------------*/
AP4_DEFINE_DYNAMIC_CAST_ANCHOR(AP4_SbgpAtom)
/*----------------------------------------------------------------------
| AP4_SbgpAtom::Create
+---------------------------------------------------------------------*/
AP4_SbgpAtom*
AP4_SbgpAtom::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_SbgpAtom(size, version, flags, stream);
}
/*----------------------------------------------------------------------
| AP4_SbgpAtom::AP4_SbgpAtom
+---------------------------------------------------------------------*/
AP4_SbgpAtom::AP4_SbgpAtom() :
AP4_Atom(AP4_ATOM_TYPE_SBGP, AP4_FULL_ATOM_HEADER_SIZE+8, 0, 0),
m_GroupingType(0),
m_GroupingTypeParameter(0)
{
}
/*----------------------------------------------------------------------
| AP4_SbgpAtom::AP4_SbgpAtom
+---------------------------------------------------------------------*/
AP4_SbgpAtom::AP4_SbgpAtom(AP4_UI32 size,
AP4_UI08 version,
AP4_UI32 flags,
AP4_ByteStream& stream) :
AP4_Atom(AP4_ATOM_TYPE_SBGP, size, version, flags),
m_GroupingType(0),
m_GroupingTypeParameter(0)
{
if (size < AP4_FULL_ATOM_HEADER_SIZE + 4) return;
AP4_UI32 remains = size-AP4_FULL_ATOM_HEADER_SIZE;
stream.ReadUI32(m_GroupingType);
remains -= 4;
if (version >= 1) {
if (remains < 4) return;
stream.ReadUI32(m_GroupingTypeParameter);
remains -= 4;
}
if (remains < 4) return;
AP4_UI32 entry_count = 0;
AP4_Result result = stream.ReadUI32(entry_count);
if (AP4_FAILED(result)) return;
remains -= 4;
if (remains < (AP4_UI64)entry_count*8) {
return;
}
m_Entries.SetItemCount(entry_count);
for (unsigned int i=0; i<entry_count; i++) {
Entry entry;
stream.ReadUI32(entry.sample_count);
stream.ReadUI32(entry.group_description_index);
m_Entries[i] = entry;
}
}
/*----------------------------------------------------------------------
| AP4_SbgpAtom::WriteFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_SbgpAtom::WriteFields(AP4_ByteStream& stream)
{
AP4_Result result;
result = stream.WriteUI32(m_GroupingType);
if (AP4_FAILED(result)) return result;
if (m_Version >= 1) {
result = stream.WriteUI32(m_GroupingTypeParameter);
if (AP4_FAILED(result)) return result;
}
result = stream.WriteUI32(m_Entries.ItemCount());
if (AP4_FAILED(result)) return result;
for (unsigned int i=0; i<m_Entries.ItemCount(); i++) {
result = stream.WriteUI32(m_Entries[i].sample_count);
if (AP4_FAILED(result)) return result;
result = stream.WriteUI32(m_Entries[i].group_description_index);
if (AP4_FAILED(result)) return result;
}
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_SbgpAtom::InspectFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_SbgpAtom::InspectFields(AP4_AtomInspector& inspector)
{
char fourcc[5];
AP4_FormatFourChars(fourcc, m_GroupingType);
inspector.AddField("grouping_type", fourcc);
if (m_Version >= 1) {
inspector.AddField("grouping_type_parameter", m_GroupingTypeParameter);
}
inspector.AddField("entry_count", m_Entries.ItemCount());
if (inspector.GetVerbosity() >= 2) {
inspector.StartArray("entries", m_Entries.ItemCount());
for (AP4_Ordinal i=0; i<m_Entries.ItemCount(); i++) {
inspector.StartObject(NULL, 2, true);
inspector.AddField("sample_count", m_Entries[i].sample_count);
inspector.AddField("group_description_index", m_Entries[i].group_description_index);
inspector.EndObject();
}
inspector.EndArray();
}
return AP4_SUCCESS;
}