void MP4RootAtom::FinishOptimalWrite()
{
// finish writing mdat
m_pChildAtoms[GetLastMdatIndex()]->FinishWrite(m_pFile->Use64Bits("mdat"));
// find moov atom
u_int32_t size = m_pChildAtoms.Size();
MP4Atom* pMoovAtom = NULL;
u_int32_t i;
for (i = 0; i < size; i++) {
if (!strcmp("moov", m_pChildAtoms[i]->GetType())) {
pMoovAtom = m_pChildAtoms[i];
break;
}
}
ASSERT(i < size);
// rewrite moov so that updated chunkOffsets are written to disk
m_pFile->SetPosition(pMoovAtom->GetStart());
u_int64_t oldSize = pMoovAtom->GetSize();
pMoovAtom->Write();
// sanity check
u_int64_t newSize = pMoovAtom->GetSize();
ASSERT(oldSize == newSize);
}
void MP4RootAtom::BeginWrite(bool use64)
{
// only call under MP4Create() control
WriteAtomType("ftyp", OnlyOne);
m_pChildAtoms[GetLastMdatIndex()]->BeginWrite(m_pFile->Use64Bits("mdat"));
}
void MP4RootAtom::FinishWrite(bool use64)
{
if( m_rewrite_ftyp ) {
const uint64_t savepos = m_pFile->GetPosition();
m_pFile->SetPosition( m_rewrite_ftypPosition );
m_rewrite_ftyp->Write();
const uint64_t newpos = m_pFile->GetPosition();
if( newpos > m_rewrite_freePosition )
m_rewrite_free->SetSize( m_rewrite_free->GetSize() - (newpos - m_rewrite_freePosition) ); // shrink
else if( newpos < m_rewrite_freePosition )
m_rewrite_free->SetSize( m_rewrite_free->GetSize() + (m_rewrite_freePosition - newpos) ); // grow
m_rewrite_free->Write();
m_pFile->SetPosition( savepos );
}
// finish writing last mdat atom
const uint32_t mdatIndex = GetLastMdatIndex();
m_pChildAtoms[mdatIndex]->FinishWrite( m_pFile->Use64Bits( "mdat" ));
// write all atoms after last mdat
const uint32_t size = m_pChildAtoms.Size();
for ( uint32_t i = mdatIndex + 1; i < size; i++ )
m_pChildAtoms[i]->Write();
}
void MP4RootAtom::BeginOptimalWrite()
{
WriteAtomType("ftyp", OnlyOne);
WriteAtomType("moov", OnlyOne);
WriteAtomType("udta", Many);
m_pChildAtoms[GetLastMdatIndex()]->BeginWrite(m_pFile->Use64Bits("mdat"));
}
void MP4RootAtom::FinishWrite(bool use64)
{
// finish writing last mdat atom
u_int32_t mdatIndex = GetLastMdatIndex();
m_pChildAtoms[mdatIndex]->FinishWrite(m_pFile->Use64Bits("mdat"));
// write all atoms after last mdat
u_int32_t size = m_pChildAtoms.Size();
for (u_int32_t i = mdatIndex + 1; i < size; i++) {
m_pChildAtoms[i]->Write();
}
}
void MP4RootAtom::BeginWrite(bool use64)
{
m_rewrite_ftyp = (MP4FtypAtom*)FindChildAtom( "ftyp" );
if( m_rewrite_ftyp ) {
m_rewrite_free = (MP4FreeAtom*)MP4Atom::CreateAtom( NULL, "free" );
m_rewrite_free->SetSize( 32*4 ); // room for 32 additional brands
AddChildAtom( m_rewrite_free );
m_rewrite_ftypPosition = m_pFile->GetPosition();
m_rewrite_ftyp->Write();
m_rewrite_freePosition = m_pFile->GetPosition();
m_rewrite_free->Write();
}
m_pChildAtoms[GetLastMdatIndex()]->BeginWrite( m_pFile->Use64Bits( "mdat" ));
}