142   Status OnElementBeginConcrete(const ElementMetadata& metadata,  in OnElementBeginConcrete()
147   Status OnUnknownElementConcrete(const ElementMetadata& metadata,  in OnUnknownElementConcrete()
153   Status OnEbmlConcrete(const ElementMetadata& metadata, const Ebml& ebml) {  in OnEbmlConcrete()
157   Status OnVoidConcrete(const ElementMetadata& metadata, Reader* reader,  in OnVoidConcrete()
162   Status OnSegmentBeginConcrete(const ElementMetadata& metadata,  in OnSegmentBeginConcrete()
167   Status OnSeekConcrete(const ElementMetadata& metadata, const Seek& seek) {  in OnSeekConcrete()
171   Status OnInfoConcrete(const ElementMetadata& metadata, const Info& info) {  in OnInfoConcrete()
175   Status OnClusterBeginConcrete(const ElementMetadata& metadata,  in OnClusterBeginConcrete()
180   Status OnSimpleBlockBeginConcrete(const ElementMetadata& metadata,  in OnSimpleBlockBeginConcrete()
186   Status OnSimpleBlockEndConcrete(const ElementMetadata& metadata,  in OnSimpleBlockEndConcrete()
191   Status OnBlockGroupBeginConcrete(const ElementMetadata& metadata,  in OnBlockGroupBeginConcrete()
196   Status OnBlockBeginConcrete(const ElementMetadata& metadata,  in OnBlockBeginConcrete()
201   Status OnBlockEndConcrete(const ElementMetadata& metadata,  in OnBlockEndConcrete()
206   Status OnBlockGroupEndConcrete(const ElementMetadata& metadata,  in OnBlockGroupEndConcrete()
211   Status OnFrameConcrete(const FrameMetadata& metadata, Reader* reader,  in OnFrameConcrete()
216   Status OnClusterEndConcrete(const ElementMetadata& metadata,  in OnClusterEndConcrete()
221   Status OnTrackEntryConcrete(const ElementMetadata& metadata,  in OnTrackEntryConcrete()
226   Status OnCuePointConcrete(const ElementMetadata& metadata,  in OnCuePointConcrete()
231   Status OnEditionEntryConcrete(const ElementMetadata& metadata,  in OnEditionEntryConcrete()
236   Status OnTagConcrete(const ElementMetadata& metadata, const Tag& tag) {  in OnTagConcrete()
240   Status OnSegmentEndConcrete(const ElementMetadata& metadata) {  in OnSegmentEndConcrete()