git.sesse.net Git - mlt/blob - src/mlt++/MltFilteredProducer.cpp

   1 /**
   2  * MltFilteredProducer.cpp - MLT Wrapper
   3  * Copyright (C) 2004-2005 Charles Yates
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "MltFilteredProducer.h"
  22 #include "MltProfile.h"
  23 using namespace Mlt;
  24
  25 FilteredProducer::FilteredProducer( Profile& profile, const char *id, const char *arg ) :
  26         Producer( profile, id, arg )
  27 {
  28         // Create a reference to the last service
  29         last = new Service( *this );
  30 }
  31
  32 FilteredProducer::~FilteredProducer( )
  33 {
  34         // Delete the reference to the last service
  35         delete last;
  36 }
  37
  38 int FilteredProducer::attach( Filter &filter )
  39 {
  40         int error = 0;
  41         if ( filter.is_valid( ) )
  42         {
  43                 Service *consumer = last->consumer( );
  44                 filter.connect_producer( *last );
  45                 if ( consumer->is_valid( ) )
  46                         consumer->connect_producer( filter );
  47                 delete consumer;
  48                 delete last;
  49                 last = new Service( filter );
  50         }
  51         else
  52         {
  53                 error = 1;
  54         }
  55         return error;
  56 }
  57
  58 int FilteredProducer::detach( Filter &filter )
  59 {
  60         if ( filter.is_valid( ) )
  61         {
  62                 Service *it = new Service( *last );
  63                 while ( it->is_valid( ) && it->get_service( ) != filter.get_service( ) )
  64                 {
  65                         Service *producer = it->producer( );
  66                         delete it;
  67                         it = producer;
  68                 }
  69                 if ( it->get_service( ) == filter.get_service( ) )
  70                 {
  71                         Service *producer = it->producer( );
  72                         Service *consumer = it->consumer( );
  73                         if ( consumer->is_valid( ) )
  74                                 consumer->connect_producer( *producer );
  75                         Profile p( get_profile() );
  76                         Producer dummy( p, "colour" );
  77                         dummy.connect_producer( *it );
  78                         if ( last->get_service( ) == it->get_service( ) )
  79                         {
  80                                 delete last;
  81                                 last = new Service( *producer );
  82                         }
  83                 }
  84                 delete it;
  85         }
  86         return 0;
  87 }
  88