boost::shared_ptr<EPVideoTrack> EPVideoTrack::CreateVideoTrack( AxMobSlot& axMobSlot )
{
//1. Ensure the slot's data def is either picture or sound
AxDataDef axDataDef( axMobSlot.GetDataDef() );
if ( axDataDef.IsPictureKind() )
{
//2. Ensure the segment is a source clip.
AxSegment axSegment( axMobSlot.GetSegment() );
IAAFSourceClipSP spSrcClip;
if ( AxIsA( axSegment, spSrcClip ) )
{
//3. Ensure the source clip contains a source mob.
AxSourceClip axSrcClip( spSrcClip );
//4. Make sure that the referenced source mob is in this AAF file.
if ( IsReferenceInFile( axSrcClip ) )
{
AxMob axMob( axSrcClip.ResolveRef() );
IAAFSourceMobSP spSrcMob;
if ( AxIsA( axMob, spSrcMob ) )
{
//5. Ensure the source mob is a file source mob.
AxSourceMob axSrcMob( spSrcMob );
AxEssenceDescriptor descriptor( axSrcMob.GetEssenceDescriptor() );
IAAFFileDescriptorSP spFileDes;
if ( AxIsA( descriptor, spFileDes ) )
{
boost::shared_ptr<EPVideoTrack> spTrack( new EPVideoTrack( axMobSlot, axSrcClip, axSrcMob ) );
return spTrack;
}
}
}
}
}
//Return a null shared pointer if the mob slot does not contain an essence
//track.
return boost::shared_ptr<EPVideoTrack>();
}
void Aif2XtlSourceClipVisitor::PreOrderVisit( Aif2XtlSourceClipNode& node )
{
// If the source clip references a composition mob then we build the
// sub tree for that mob. If the sub tree also contains further
// sub compositions, these will be processed when
IAAFSourceClipSP spSourceClip;
spSourceClip = node.GetAif2XtlAAFObject();
AxSourceClip axSrcClip( spSourceClip );
AxMob axReferencedMob( axSrcClip.ResolveRef() );
IAAFCompositionMobSP spCompMob;
if ( !AxIsA( axReferencedMob, spCompMob ) ) {
return;
}
aafSourceRef_t srcRef = axSrcClip.GetSourceReference();
// Decorate this node so that we can easily distingquish it from
// other source clips (i.e. master and chained source clips)
// later on.
std::auto_ptr<Aif2XtlUnMasteredSourceClipDecoration> pSrcClipDec
( new Aif2XtlUnMasteredSourceClipDecoration );
node.PushDecoration( pSrcClipDec );
// Build a sub tree that includes only the referenced slot.
RejectUnreferencedSlots rejectAllSlotsButThisOne( srcRef.sourceSlotID );
std::auto_ptr<AifParseTreeNode> chainedSubTreeRoot
= AifBuildParseTree( axReferencedMob,
_nodeFactory,
rejectAllSlotsButThisOne );
node.AddChild( chainedSubTreeRoot );
}
void Aif2XtlSourceClipVisitor::PostOrderVisit( Aif2XtlSourceClipNode& node )
{
try {
IAAFSourceClipSP spChainedSourceClip = node.GetAif2XtlAAFObject();
AxSourceClip axSrcClip( spChainedSourceClip );
AxMob axReferencedMob( axSrcClip.ResolveRef() );
IAAFMasterMobSP spMasterMob;
if ( !AxIsA( axReferencedMob, spMasterMob ) ) {
return;
}
// Decorate this node so that we can easily distingquish it from
// other source clips (i.e. master and chained source clips)
// later on.
std::auto_ptr<Aif2XtlUnMasteredSourceClipDecoration> pSrcClipDec
( new Aif2XtlUnMasteredSourceClipDecoration );
node.PushDecoration( pSrcClipDec );
aafSourceRef_t srcRef = axSrcClip.GetSourceReference();
RejectUnreferencedSlots rejectAllSlotsButThisOne( srcRef.sourceSlotID );
std::auto_ptr<AifParseTreeNode> chainedSubTreeRoot
= AifBuildParseTree( axReferencedMob,
_nodeFactory,
rejectAllSlotsButThisOne );
Aif2XtlSourceClipNode* pRootSrcClipNode = 0;
bool notAtEndOfChain = GetChainedSourceClip( *chainedSubTreeRoot, GetLogStream(), &pRootSrcClipNode );
Aif2XtlSourceClipNode* pChainedSrcClipNode = pRootSrcClipNode;
// This is a master mob. It should never be the end of the chain.
assert(notAtEndOfChain);
node.AddChild( chainedSubTreeRoot );
while ( notAtEndOfChain ) {
spChainedSourceClip = pChainedSrcClipNode->GetAif2XtlAAFObject();
AxSourceClip axSrcClip( spChainedSourceClip );
AxMob axReferencedMob( axSrcClip.ResolveRef() );
aafSourceRef_t srcRef = axSrcClip.GetSourceReference();
RejectUnreferencedSlots rejectAllSlotsButThisOne( srcRef.sourceSlotID );
std::auto_ptr<AifParseTreeNode> chainedSubTreeRoot
= AifBuildParseTree( axReferencedMob,
_nodeFactory,
rejectAllSlotsButThisOne );
notAtEndOfChain = GetChainedSourceClip( *chainedSubTreeRoot, GetLogStream(), &pChainedSrcClipNode );
pRootSrcClipNode->AddChild( chainedSubTreeRoot );
}
}
catch( const AxExHResult& ex ) {
if ( ex.getHResult() != AAFRESULT_MOB_NOT_FOUND ) {
throw;
}
}
}
