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|
/*****************************************************************
|
| AP4 - stss 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 "Ap4StssAtom.h"
#include "Ap4AtomFactory.h"
#include "Ap4Utils.h"
/*----------------------------------------------------------------------
| dynamic cast support
+---------------------------------------------------------------------*/
AP4_DEFINE_DYNAMIC_CAST_ANCHOR(AP4_StssAtom)
/*----------------------------------------------------------------------
| AP4_StssAtom::Create
+---------------------------------------------------------------------*/
AP4_StssAtom*
AP4_StssAtom::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_StssAtom(size, version, flags, stream);
}
/*----------------------------------------------------------------------
| AP4_StssAtom::AP4_StssAtom
+---------------------------------------------------------------------*/
AP4_StssAtom::AP4_StssAtom() :
AP4_Atom(AP4_ATOM_TYPE_STSS, AP4_FULL_ATOM_HEADER_SIZE+4, 0, 0)
{
}
/*----------------------------------------------------------------------
| AP4_StssAtom::AP4_StssAtom
+---------------------------------------------------------------------*/
AP4_StssAtom::AP4_StssAtom(AP4_UI32 size,
AP4_UI08 version,
AP4_UI32 flags,
AP4_ByteStream& stream) :
AP4_Atom(AP4_ATOM_TYPE_STSS, size, version, flags),
m_LookupCache(0)
{
AP4_UI32 entry_count;
stream.ReadUI32(entry_count);
// check for bogus values
if (entry_count*4 > size) return;
// read the table into a local array for conversion
unsigned char* buffer = new unsigned char[entry_count*4];
AP4_Result result = stream.Read(buffer, entry_count*4);
if (AP4_FAILED(result)) {
delete[] buffer;
return;
}
m_Entries.SetItemCount(entry_count);
for (unsigned int i=0; i<entry_count; i++) {
m_Entries[i] = AP4_BytesToUInt32BE(&buffer[i*4]);
}
delete[] buffer;
}
/*----------------------------------------------------------------------
| AP4_StssAtom::WriteFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_StssAtom::WriteFields(AP4_ByteStream& stream)
{
AP4_Result result;
// entry count
AP4_Cardinal entry_count = m_Entries.ItemCount();
result = stream.WriteUI32(entry_count);
if (AP4_FAILED(result)) return result;
// entries
for (AP4_Ordinal i=0; i<entry_count; i++) {
result = stream.WriteUI32(m_Entries[i]);
if (AP4_FAILED(result)) return result;
}
return result;
}
/*----------------------------------------------------------------------
| AP4_StssAtom::AddEntry
+---------------------------------------------------------------------*/
AP4_Result
AP4_StssAtom::AddEntry(AP4_UI32 sample)
{
m_Entries.Append(sample);
m_Size32 += 4;
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_StssAtom::IsSampleSync
+---------------------------------------------------------------------*/
bool
AP4_StssAtom::IsSampleSync(AP4_Ordinal sample)
{
unsigned int entry_index = 0;
// check bounds
if (sample == 0 || m_Entries.ItemCount() == 0) return false;
// see if we can start from the cached index
if (m_Entries[m_LookupCache] <= sample) {
entry_index = m_LookupCache;
}
// do a linear search
while (entry_index < m_Entries.ItemCount() &&
m_Entries[entry_index] <= sample) {
if (m_Entries[entry_index] == sample) {
m_LookupCache = entry_index;
return true;
}
entry_index++;
}
return false;
}
/*----------------------------------------------------------------------
| AP4_StssAtom::InspectFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_StssAtom::InspectFields(AP4_AtomInspector& inspector)
{
inspector.AddField("entry_count", m_Entries.ItemCount());
return AP4_SUCCESS;
}
|
