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|
/*****************************************************************
|
| AP4 - Movie Fragments
|
| Copyright 2002-2009 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 "Ap4File.h"
#include "Ap4Atom.h"
#include "Ap4MfhdAtom.h"
#include "Ap4TfhdAtom.h"
#include "Ap4TrexAtom.h"
#include "Ap4MovieFragment.h"
#include "Ap4ContainerAtom.h"
#include "Ap4FragmentSampleTable.h"
#include "Ap4Movie.h"
#include "Ap4Sample.h"
/*----------------------------------------------------------------------
| AP4_MovieFragment::AP4_MovieFragment
+---------------------------------------------------------------------*/
AP4_MovieFragment::AP4_MovieFragment(AP4_ContainerAtom* moof) :
m_MoofAtom(moof),
m_MfhdAtom(NULL)
{
if (moof) m_MfhdAtom = AP4_DYNAMIC_CAST(AP4_MfhdAtom, moof->GetChild(AP4_ATOM_TYPE_MFHD));
}
/*----------------------------------------------------------------------
| AP4_MovieFragment::~AP4_MovieFragment
+---------------------------------------------------------------------*/
AP4_MovieFragment::~AP4_MovieFragment()
{
delete m_MoofAtom;
}
/*----------------------------------------------------------------------
| AP4_MovieFragment::GetSequenceNumber
+---------------------------------------------------------------------*/
AP4_UI32
AP4_MovieFragment::GetSequenceNumber()
{
return m_MfhdAtom?m_MfhdAtom->GetSequenceNumber():0;
}
/*----------------------------------------------------------------------
| AP4_MovieFragment::GetTrackIds
+---------------------------------------------------------------------*/
AP4_Result
AP4_MovieFragment::GetTrackIds(AP4_Array<AP4_UI32>& ids)
{
ids.Clear();
ids.EnsureCapacity(m_MoofAtom->GetChildren().ItemCount());
for (AP4_List<AP4_Atom>::Item* item = m_MoofAtom->GetChildren().FirstItem();
item;
item = item->GetNext()) {
AP4_Atom* atom = item->GetData();
if (atom->GetType() == AP4_ATOM_TYPE_TRAF) {
AP4_ContainerAtom* traf = AP4_DYNAMIC_CAST(AP4_ContainerAtom, atom);
if (traf) {
AP4_TfhdAtom* tfhd = AP4_DYNAMIC_CAST(AP4_TfhdAtom, traf->GetChild(AP4_ATOM_TYPE_TFHD));
if (tfhd) ids.Append(tfhd->GetTrackId());
}
}
}
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_MovieFragment::GetTrafAtom
+---------------------------------------------------------------------*/
AP4_Result
AP4_MovieFragment::GetTrafAtom(AP4_UI32 track_id, AP4_ContainerAtom*& traf)
{
for (AP4_List<AP4_Atom>::Item* item = m_MoofAtom->GetChildren().FirstItem();
item;
item = item->GetNext()) {
AP4_Atom* atom = item->GetData();
if (atom->GetType() == AP4_ATOM_TYPE_TRAF) {
traf = AP4_DYNAMIC_CAST(AP4_ContainerAtom, atom);
if (traf) {
AP4_TfhdAtom* tfhd = AP4_DYNAMIC_CAST(AP4_TfhdAtom, traf->GetChild(AP4_ATOM_TYPE_TFHD));
if (tfhd && tfhd->GetTrackId() == track_id) {
return AP4_SUCCESS;
}
}
}
}
// not found
traf = NULL;
return AP4_ERROR_NO_SUCH_ITEM;
}
/*----------------------------------------------------------------------
| AP4_MovieFragment::CreateSampleTable
+---------------------------------------------------------------------*/
AP4_Result
AP4_MovieFragment::CreateSampleTable(AP4_MoovAtom* moov,
AP4_UI32 track_id,
AP4_ByteStream* sample_stream,
AP4_Position moof_offset,
AP4_Position mdat_payload_offset,
AP4_UI64 mdat_payload_size,
AP4_UI64 dts_origin,
AP4_FragmentSampleTable*& sample_table)
{
// default value
sample_table = NULL;
// find a trex for this track, if any
AP4_ContainerAtom* mvex = NULL;
AP4_TrexAtom* trex = NULL;
if (moov) {
mvex = AP4_DYNAMIC_CAST(AP4_ContainerAtom, moov->GetChild(AP4_ATOM_TYPE_MVEX));
}
if (mvex) {
for (AP4_List<AP4_Atom>::Item* item = mvex->GetChildren().FirstItem();
item;
item = item->GetNext()) {
AP4_Atom* atom = item->GetData();
if (atom->GetType() == AP4_ATOM_TYPE_TREX) {
trex = AP4_DYNAMIC_CAST(AP4_TrexAtom, atom);
if (trex && trex->GetTrackId() == track_id) break;
trex = NULL;
}
}
}
AP4_ContainerAtom* traf = NULL;
if (AP4_SUCCEEDED(GetTrafAtom(track_id, traf))) {
sample_table = new AP4_FragmentSampleTable(traf,
trex,
track_id,
sample_stream,
moof_offset,
mdat_payload_offset,
mdat_payload_size,
dts_origin);
return AP4_SUCCESS;
}
return AP4_ERROR_NO_SUCH_ITEM;
}
/*----------------------------------------------------------------------
| AP4_MovieFragment::CreateSampleTable
+---------------------------------------------------------------------*/
AP4_Result
AP4_MovieFragment::CreateSampleTable(AP4_Movie* movie,
AP4_UI32 track_id,
AP4_ByteStream* sample_stream,
AP4_Position moof_offset,
AP4_Position mdat_payload_offset,
AP4_UI64 mdat_payload_size,
AP4_UI64 dts_origin,
AP4_FragmentSampleTable*& sample_table)
{
AP4_MoovAtom* moov = movie?movie->GetMoovAtom():NULL;
return CreateSampleTable(moov, track_id, sample_stream, moof_offset, mdat_payload_offset, mdat_payload_size, dts_origin, sample_table);
}
|
