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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 "Ap4SgpdAtom.h"
#include "Ap4Utils.h"
#include "Ap4ContainerAtom.h"
#include "Ap4AtomFactory.h"
/*----------------------------------------------------------------------
| dynamic cast support
+---------------------------------------------------------------------*/
AP4_DEFINE_DYNAMIC_CAST_ANCHOR(AP4_SgpdAtom)
/*----------------------------------------------------------------------
| AP4_SgpdAtom::Create
+---------------------------------------------------------------------*/
AP4_SgpdAtom*
AP4_SgpdAtom::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 > 1) return NULL;
return new AP4_SgpdAtom(size, version, flags, stream);
}
/*----------------------------------------------------------------------
| AP4_SgpdAtom::~AP4_SgpdAtom
+---------------------------------------------------------------------*/
AP4_SgpdAtom::~AP4_SgpdAtom()
{
for (AP4_List<AP4_DataBuffer>::Item* item = m_Entries.FirstItem();
item;
item = item->GetNext()) {
delete item->GetData();
}
}
/*----------------------------------------------------------------------
| AP4_SgpdAtom::AP4_SgpdAtom
+---------------------------------------------------------------------*/
AP4_SgpdAtom::AP4_SgpdAtom(AP4_UI32 size,
AP4_UI08 version,
AP4_UI32 flags,
AP4_ByteStream& stream) :
AP4_Atom(AP4_ATOM_TYPE_SGPD, size, version, flags),
m_GroupingType(0),
m_DefaultLength(0)
{
AP4_Size bytes_available = size-AP4_FULL_ATOM_HEADER_SIZE;
stream.ReadUI32(m_GroupingType);
bytes_available -= 4;
if (version >= 1) {
stream.ReadUI32(m_DefaultLength);
bytes_available -= 4;
}
// read the number of entries
AP4_UI32 entry_count = 0;
AP4_Result result = stream.ReadUI32(entry_count);
if (AP4_FAILED(result)) return;
bytes_available -= 4;
// read all entries
for (unsigned int i=0; i<entry_count; i++) {
AP4_UI32 description_length = m_DefaultLength;
if (m_Version == 0) {
// entry size unknown, read the whole thing
description_length = bytes_available;
} else {
if (m_DefaultLength == 0) {
description_length = stream.ReadUI32(description_length);
}
}
if (description_length <= bytes_available) {
AP4_DataBuffer* payload = new AP4_DataBuffer();
if (description_length) {
payload->SetDataSize(description_length);
stream.Read(payload->UseData(), description_length);
}
m_Entries.Add(payload);
}
}
}
/*----------------------------------------------------------------------
| AP4_SgpdAtom::WriteFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_SgpdAtom::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_DefaultLength);
if (AP4_FAILED(result)) return result;
}
// write the children
result = stream.WriteUI32(m_Entries.ItemCount());
if (AP4_FAILED(result)) return result;
for (AP4_List<AP4_DataBuffer>::Item* item = m_Entries.FirstItem();
item;
item = item->GetNext()) {
AP4_DataBuffer* entry = item->GetData();
if (m_Version >= 1) {
if (m_DefaultLength == 0) {
stream.WriteUI32((AP4_UI32)entry->GetDataSize());
}
}
result = stream.Write(entry->GetData(), entry->GetDataSize());
if (AP4_FAILED(result)) {
return result;
}
}
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_SgpdAtom::InspectFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_SgpdAtom::InspectFields(AP4_AtomInspector& inspector)
{
char fourcc[5];
AP4_FormatFourChars(fourcc, m_GroupingType);
inspector.AddField("grouping_type", fourcc);
if (m_Version >= 1) {
inspector.AddField("default_length", m_DefaultLength);
}
inspector.AddField("entry_count", m_Entries.ItemCount());
// inspect entries
char header[32];
unsigned int i=0;
for (AP4_List<AP4_DataBuffer>::Item* item = m_Entries.FirstItem();
item;
item = item->GetNext()) {
AP4_DataBuffer* entry = item->GetData();
AP4_FormatString(header, sizeof(header), "entry %02d", i);
++i;
inspector.AddField(header, entry->GetData(), entry->GetDataSize());
}
return AP4_SUCCESS;
}
|
