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|
/*****************************************************************
|
| AP4 - moov Atoms
|
| Copyright 2002 Gilles Boccon-Gibod
|
|
| 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 "Ap4.h"
#include "Ap4MoovAtom.h"
#include "Ap4TrakAtom.h"
#include "Ap4AtomFactory.h"
#include "Ap4DcomAtom.h"
#include "Ap4CmvdAtom.h"
#include <zlib/zlib.h>
/*----------------------------------------------------------------------
| AP4_TrakAtomCollector
+---------------------------------------------------------------------*/
class AP4_TrakAtomCollector : public AP4_List<AP4_Atom>::Item::Operator
{
public:
AP4_TrakAtomCollector(AP4_List<AP4_TrakAtom>* track_atoms) :
m_TrakAtoms(track_atoms) {}
AP4_Result Action(AP4_Atom* atom) const {
if (atom->GetType() == AP4_ATOM_TYPE_TRAK) {
AP4_TrakAtom* trak = dynamic_cast<AP4_TrakAtom*>(atom);
if (trak) {
m_TrakAtoms->Add(trak);
}
}
return AP4_SUCCESS;
}
private:
AP4_List<AP4_TrakAtom>* m_TrakAtoms;
};
/*----------------------------------------------------------------------
| AP4_MoovAtom::AP4_MoovAtom
+---------------------------------------------------------------------*/
AP4_MoovAtom::AP4_MoovAtom() :
AP4_ContainerAtom(AP4_ATOM_TYPE_MOOV),
m_TimeScale(0)
{
}
/*----------------------------------------------------------------------
| AP4_MoovAtom::AP4_MoovAtom
+---------------------------------------------------------------------*/
AP4_MoovAtom::AP4_MoovAtom(AP4_Size size,
AP4_ByteStream& stream,
AP4_AtomFactory& atom_factory) :
AP4_ContainerAtom(AP4_ATOM_TYPE_MOOV, size, false, stream, atom_factory),
m_TimeScale(0)
{
if(AP4_ContainerAtom* cmov = dynamic_cast<AP4_ContainerAtom*>(GetChild(AP4_ATOM_TYPE_CMOV)))
{
AP4_DcomAtom* dcom = dynamic_cast<AP4_DcomAtom*>(cmov->GetChild(AP4_ATOM_TYPE_DCOM));
AP4_CmvdAtom* cmvd = dynamic_cast<AP4_CmvdAtom*>(cmov->GetChild(AP4_ATOM_TYPE_CMVD));
if(dcom && dcom->GetCompressorSubType() == AP4_ATOM_TYPE('z','l','i','b') && cmvd)
{
const AP4_DataBuffer& data = cmvd->GetDataBuffer();
z_stream d_stream;
d_stream.zalloc = (alloc_func)0;
d_stream.zfree = (free_func)0;
d_stream.opaque = (voidpf)0;
int res;
if(Z_OK == (res = inflateInit(&d_stream)))
{
d_stream.next_in = (Bytef*)data.GetData();
d_stream.avail_in = data.GetDataSize();
unsigned char* dst = NULL;
int n = 0;
do
{
dst = (unsigned char*)realloc(dst, ++n*1000);
d_stream.next_out = &dst[(n-1)*1000];
d_stream.avail_out = 1000;
if(Z_OK != (res = inflate(&d_stream, Z_NO_FLUSH)) && Z_STREAM_END != res)
{
free(dst);
dst = NULL;
break;
}
}
while(0 == d_stream.avail_out && 0 != d_stream.avail_in && Z_STREAM_END != res);
inflateEnd(&d_stream);
if(dst)
{
AP4_ByteStream* s = DNew AP4_MemoryByteStream(dst, d_stream.total_out);
ReadChildren(atom_factory, *s, d_stream.total_out);
s->Release();
free(dst);
}
if(AP4_MoovAtom* moov = dynamic_cast<AP4_MoovAtom*>(GetChild(AP4_ATOM_TYPE_MOOV)))
{
AP4_List<AP4_Atom> Children;
for(AP4_List<AP4_Atom>::Item* item = moov->GetChildren().FirstItem();
item;
item = item->GetNext())
{
Children.Add(item->GetData());
}
for(AP4_List<AP4_Atom>::Item* item = Children.FirstItem();
item;
item = item->GetNext())
{
AP4_Atom* atom = item->GetData();
atom->Detach();
atom->SetParent(this);
m_Children.Add(atom);
}
moov->Detach();
delete moov;
}
}
}
}
// collect all trak atoms
m_Children.Apply(AP4_TrakAtomCollector(&m_TrakAtoms));
}
/*----------------------------------------------------------------------
| AP4_MoovAtom::OnChildAdded
+---------------------------------------------------------------------*/
void
AP4_MoovAtom::OnChildAdded(AP4_Atom* atom)
{
// keep the atom in the list of trak atoms
if (atom->GetType() == AP4_ATOM_TYPE_TRAK) {
AP4_TrakAtom* trak = dynamic_cast<AP4_TrakAtom*>(atom);
if (trak) {
m_TrakAtoms.Add(trak);
}
}
// call the base class implementation
AP4_ContainerAtom::OnChildAdded(atom);
}
/*----------------------------------------------------------------------
| AP4_MoovAtom::OnChildRemoved
+---------------------------------------------------------------------*/
void
AP4_MoovAtom::OnChildRemoved(AP4_Atom* atom)
{
// remove the atom from the list of trak atoms
if (atom->GetType() == AP4_ATOM_TYPE_TRAK) {
AP4_TrakAtom* trak = dynamic_cast<AP4_TrakAtom*>(atom);
if (trak) {
m_TrakAtoms.Remove(trak);
}
}
// call the base class implementation
AP4_ContainerAtom::OnChildRemoved(atom);
}
|