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|
/*****************************************************************
|
| AP4 - elst 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 "Ap4ElstAtom.h"
#include "Ap4Utils.h"
/*----------------------------------------------------------------------
| AP4_ElstAtom::Create
+---------------------------------------------------------------------*/
AP4_ElstAtom*
AP4_ElstAtom::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_ElstAtom(size, version, flags, stream);
}
/*----------------------------------------------------------------------
| AP4_ElstAtom::AP4_ElstAtom
+---------------------------------------------------------------------*/
AP4_ElstAtom::AP4_ElstAtom(AP4_UI32 size,
AP4_UI08 version,
AP4_UI32 flags,
AP4_ByteStream& stream) :
AP4_Atom(AP4_ATOM_TYPE_ELST, size, version, flags)
{
AP4_UI32 entry_count;
stream.ReadUI32(entry_count);
m_Entries.EnsureCapacity(entry_count);
for (AP4_UI32 i=0; i<entry_count; i++) {
AP4_UI16 media_rate;
AP4_UI16 zero;
if (version == 0) {
AP4_UI32 segment_duration;
AP4_UI32 media_time;
stream.ReadUI32(segment_duration);
stream.ReadUI32(media_time);
stream.ReadUI16(media_rate);
stream.ReadUI16(zero);
m_Entries.Append(AP4_ElstEntry(segment_duration, media_time, media_rate));
} else {
AP4_UI64 segment_duration;
AP4_UI64 media_time;
stream.ReadUI64(segment_duration);
stream.ReadUI64(media_time);
stream.ReadUI16(media_rate);
stream.ReadUI16(zero);
m_Entries.Append(AP4_ElstEntry(segment_duration, media_time, media_rate));
}
}
}
/*----------------------------------------------------------------------
| AP4_ElstAtom::WriteFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_ElstAtom::WriteFields(AP4_ByteStream& stream)
{
AP4_Result result;
result = stream.WriteUI32(m_Entries.ItemCount());
if (AP4_FAILED(result)) return result;
for (AP4_Ordinal i=0; i<m_Entries.ItemCount(); i++) {
if (m_Version == 0) {
result = stream.WriteUI32((AP4_UI32)m_Entries[i].m_SegmentDuration);
if (AP4_FAILED(result)) return result;
result = stream.WriteUI32((AP4_UI32)m_Entries[i].m_MediaTime);
if (AP4_FAILED(result)) return result;
} else {
result = stream.WriteUI64(m_Entries[i].m_SegmentDuration);
if (AP4_FAILED(result)) return result;
result = stream.WriteUI64(m_Entries[i].m_MediaTime);
if (AP4_FAILED(result)) return result;
}
result = stream.WriteUI16(m_Entries[i].m_MediaRate);
if (AP4_FAILED(result)) return result;
result = stream.WriteUI16(0);
if (AP4_FAILED(result)) return result;
}
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_ElstAtom::InspectFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_ElstAtom::InspectFields(AP4_AtomInspector& inspector)
{
inspector.AddField("entry count", m_Entries.ItemCount());
for (AP4_Ordinal i=0; i<m_Entries.ItemCount(); i++) {
inspector.AddField("entry/segment duration", (AP4_UI32)m_Entries[i].m_SegmentDuration);
inspector.AddField("entry/media time", (AP4_SI32)m_Entries[i].m_MediaTime);
inspector.AddField("entry/media rate", (AP4_UI16)m_Entries[i].m_MediaRate);
}
return AP4_SUCCESS;
}
|
