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|
/*****************************************************************
|
| AP4 - mvhd 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 "Ap4MvhdAtom.h"
#include "Ap4AtomFactory.h"
#include "Ap4Utils.h"
/*----------------------------------------------------------------------
| dynamic cast support
+---------------------------------------------------------------------*/
AP4_DEFINE_DYNAMIC_CAST_ANCHOR(AP4_MvhdAtom)
/*----------------------------------------------------------------------
| AP4_MvhdAtom::Create
+---------------------------------------------------------------------*/
AP4_MvhdAtom*
AP4_MvhdAtom::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_MvhdAtom(size, version, flags, stream);
}
/*----------------------------------------------------------------------
| AP4_MvhdAtom::AP4_MvhdAtom
+---------------------------------------------------------------------*/
AP4_MvhdAtom::AP4_MvhdAtom(AP4_UI32 creation_time,
AP4_UI32 modification_time,
AP4_UI32 time_scale,
AP4_UI64 duration,
AP4_UI32 rate,
AP4_UI16 volume) :
AP4_Atom(AP4_ATOM_TYPE_MVHD, AP4_FULL_ATOM_HEADER_SIZE+96, 0, 0),
m_CreationTime(creation_time),
m_ModificationTime(modification_time),
m_TimeScale(time_scale),
m_Duration(duration),
m_Rate(rate),
m_Volume(volume),
m_NextTrackId(0xFFFFFFFF)
{
m_Matrix[0] = 0x00010000;
m_Matrix[1] = 0;
m_Matrix[2] = 0;
m_Matrix[3] = 0;
m_Matrix[4] = 0x00010000;
m_Matrix[5] = 0;
m_Matrix[6] = 0;
m_Matrix[7] = 0;
m_Matrix[8] = 0x40000000;
AP4_SetMemory(m_Reserved1, 0, sizeof(m_Reserved1));
AP4_SetMemory(m_Reserved2, 0, sizeof(m_Reserved2));
AP4_SetMemory(m_Predefined, 0, sizeof(m_Predefined));
if (duration > 0xFFFFFFFF) {
m_Version = 1;
m_Size32 += 12;
}
}
/*----------------------------------------------------------------------
| AP4_MvhdAtom::AP4_MvhdAtom
+---------------------------------------------------------------------*/
AP4_MvhdAtom::AP4_MvhdAtom(AP4_UI32 size,
AP4_UI08 version,
AP4_UI32 flags,
AP4_ByteStream& stream) :
AP4_Atom(AP4_ATOM_TYPE_MVHD, size, version, flags)
{
if (m_Version == 0) {
AP4_UI32 creation_time;
stream.ReadUI32(creation_time);
m_CreationTime = creation_time;
AP4_UI32 modification_time;
stream.ReadUI32(modification_time);
m_ModificationTime = modification_time;
stream.ReadUI32(m_TimeScale);
AP4_UI32 duration;
stream.ReadUI32(duration);
m_Duration = duration;
} else {
stream.ReadUI64(m_CreationTime);
stream.ReadUI64(m_ModificationTime);
stream.ReadUI32(m_TimeScale);
stream.ReadUI64(m_Duration);
}
stream.ReadUI32(m_Rate);
stream.ReadUI16(m_Volume);
stream.Read(m_Reserved1, sizeof(m_Reserved1));
stream.Read(m_Reserved2, sizeof(m_Reserved2));
for (int i=0; i<9; i++) {
stream.ReadUI32(m_Matrix[i]);
}
stream.Read(m_Predefined, sizeof(m_Predefined));
stream.ReadUI32(m_NextTrackId);
}
/*----------------------------------------------------------------------
| AP4_MvhdAtom::WriteFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_MvhdAtom::WriteFields(AP4_ByteStream& stream)
{
AP4_Result result;
if (m_Version == 0) {
result = stream.WriteUI32((AP4_UI32)m_CreationTime);
if (AP4_FAILED(result)) return result;
result = stream.WriteUI32((AP4_UI32)m_ModificationTime);
if (AP4_FAILED(result)) return result;
result = stream.WriteUI32(m_TimeScale);
if (AP4_FAILED(result)) return result;
result = stream.WriteUI32((AP4_UI32)m_Duration);
if (AP4_FAILED(result)) return result;
} else {
result = stream.WriteUI64(m_CreationTime);
if (AP4_FAILED(result)) return result;
result = stream.WriteUI64(m_ModificationTime);
if (AP4_FAILED(result)) return result;
result = stream.WriteUI32(m_TimeScale);
if (AP4_FAILED(result)) return result;
result = stream.WriteUI64(m_Duration);
if (AP4_FAILED(result)) return result;
}
// rate & volume
result = stream.WriteUI32(m_Rate);
if (AP4_FAILED(result)) return result;
result = stream.WriteUI16(m_Volume);
if (AP4_FAILED(result)) return result;
// reserved
result = stream.Write(m_Reserved1, sizeof(m_Reserved1));
if (AP4_FAILED(result)) return result;
result = stream.Write(m_Reserved2, sizeof(m_Reserved2));
if (AP4_FAILED(result)) return result;
// matrix
for (int i=0; i<9; i++) {
result = stream.WriteUI32(m_Matrix[i]);
if (AP4_FAILED(result)) return result;
}
// pre-defined
result = stream.Write(m_Predefined, sizeof(m_Predefined));
if (AP4_FAILED(result)) return result;
// next track id
return stream.WriteUI32(m_NextTrackId);
}
/*----------------------------------------------------------------------
| AP4_MvhdAtom::GetDurationMs
+---------------------------------------------------------------------*/
AP4_UI32
AP4_MvhdAtom::GetDurationMs()
{
if (m_TimeScale) {
return (AP4_UI32)AP4_ConvertTime(m_Duration, m_TimeScale, 1000);
} else {
return 0;
}
}
/*----------------------------------------------------------------------
| AP4_MvhdAtom::InspectFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_MvhdAtom::InspectFields(AP4_AtomInspector& inspector)
{
inspector.AddField("timescale", m_TimeScale);
inspector.AddField("duration", m_Duration);
inspector.AddField("duration(ms)", GetDurationMs());
return AP4_SUCCESS;
}
|
