research.m1stereo.tv/gitweb/ - melted/blob - mlt++/src/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 program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU Lesser General Public License as published
   8  * by the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program 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
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include "MltFilteredProducer.h"
  22 using namespace Mlt;
  23
  24 FilteredProducer::FilteredProducer( Profile& profile, char *id, char *arg ) :
  25         Producer( profile, id, arg )
  26 {
  27         // Create a reference to the last service
  28         last = new Service( *this );
  29 }
  30
  31 FilteredProducer::~FilteredProducer( )
  32 {
  33         // Delete the reference to the last service
  34         delete last;
  35 }
  36
  37 int FilteredProducer::attach( Filter &filter )
  38 {
  39         int error = 0;
  40         if ( filter.is_valid( ) )
  41         {
  42                 Service *consumer = last->consumer( );
  43                 filter.connect_producer( *last );
  44                 if ( consumer->is_valid( ) )
  45                         consumer->connect_producer( filter );
  46                 delete consumer;
  47                 delete last;
  48                 last = new Service( filter );
  49         }
  50         else
  51         {
  52                 error = 1;
  53         }
  54         return error;
  55 }
  56
  57 int FilteredProducer::detach( Filter &filter )
  58 {
  59         if ( filter.is_valid( ) )
  60         {
  61                 Service *it = new Service( *last );
  62                 while ( it->is_valid( ) && it->get_service( ) != filter.get_service( ) )
  63                 {
  64                         Service *producer = it->producer( );
  65                         delete it;
  66                         it = producer;
  67                 }
  68                 if ( it->get_service( ) == filter.get_service( ) )
  69                 {
  70                         Service *producer = it->producer( );
  71                         Service *consumer = it->consumer( );
  72                         if ( consumer->is_valid( ) )
  73                                 consumer->connect_producer( *producer );
  74                         Producer dummy( "colour" );
  75                         dummy.connect_producer( *it );
  76                         if ( last->get_service( ) == it->get_service( ) )
  77                         {
  78                                 delete last;
  79                                 last = new Service( *producer );
  80                         }
  81                 }
  82                 delete it;
  83         }
  84         return 0;
  85 }
  86