int mlt_tractor_connect( mlt_tractor self, mlt_service producer )
{
int ret = mlt_service_connect_producer( MLT_TRACTOR_SERVICE( self ), producer, 0 );
// This is the producer we're going to connect to
if ( ret == 0 )
self->producer = producer;
return ret;
}
int mlt_tractor_remove_track( mlt_tractor self, int index )
{
int error = mlt_multitrack_disconnect( mlt_tractor_multitrack( self ), index );
if ( !error )
{
// Update the track indices of transitions and track filters.
mlt_service service = mlt_service_producer( MLT_TRACTOR_SERVICE( self ) );
while ( service )
{
mlt_service_type type = mlt_service_identify( service );
mlt_properties properties = MLT_SERVICE_PROPERTIES( service );
if ( type == transition_type )
{
mlt_transition transition = MLT_TRANSITION( service );
int a_track = mlt_transition_get_a_track( transition );
int b_track = mlt_transition_get_b_track( transition );
if ( a_track >= index || b_track >= index )
{
a_track = MAX( a_track >= index ? a_track - 1 : a_track, 0 );
b_track = MAX( b_track >= index ? b_track - 1 : b_track, 0 );
mlt_transition_set_tracks( transition, a_track, b_track );
}
}
else if ( type == filter_type )
{
int current_track = mlt_properties_get_int( properties, "track" );
if ( current_track >= index )
mlt_properties_set_int( properties, "track", MAX( current_track - 1, 0 ) );
}
service = mlt_service_producer( service );
}
}
return error;
}
mlt_service mlt_field_service( mlt_field self )
{
return MLT_TRACTOR_SERVICE( self->tractor );
}
