research.m1stereo.tv/gitweb/ - melted/blob - mlt++/src/MltFilteredConsumer.cpp

   1 /**
   2  * MltFilteredConsumer.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 "MltFilteredConsumer.h"
  22 using namespace Mlt;
  23
  24 FilteredConsumer::FilteredConsumer( char *id, char *arg ) :
  25         Consumer( id, arg )
  26 {
  27         // Create a reference to the first service
  28         first = new Service( *this );
  29 }
  30
  31 FilteredConsumer::~FilteredConsumer( )
  32 {
  33         // Delete the reference to the first service
  34         delete first;
  35 }
  36
  37 int FilteredConsumer::connect( Service &service )
  38 {
  39         // All producers must connect to the first service, hence the use of the virtual here
  40         return first->connect_producer( service );
  41 }
  42
  43 int FilteredConsumer::attach( Filter &filter )
  44 {
  45         int error = 0;
  46         if ( filter.is_valid( ) )
  47         {
  48                 Service *producer = first->producer( );
  49                 error = filter.connect( *producer );
  50                 if ( error == 0 )
  51                 {
  52                         first->connect_producer( filter );
  53                         delete first;
  54                         first = new Service( filter );
  55                 }
  56                 delete producer;
  57         }
  58         else
  59         {
  60                 error = 1;
  61         }
  62         return error;
  63 }
  64
  65 int FilteredConsumer::detach( Filter &filter )
  66 {
  67         if ( filter.is_valid( ) )
  68         {
  69                 Service *it = new Service( *first );
  70                 while ( it->is_valid( ) && it->get_service( ) != filter.get_service( ) )
  71                 {
  72                         Service *consumer = it->consumer( );
  73                         delete it;
  74                         it = consumer;
  75                 }
  76                 if ( it->get_service( ) == filter.get_service( ) )
  77                 {
  78                         Service *producer = it->producer( );
  79                         Service *consumer = it->consumer( );
  80                         consumer->connect_producer( *producer );
  81                         Service dummy( NULL );
  82                         it->connect_producer( dummy );
  83                         if ( first->get_service( ) == it->get_service( ) )
  84                         {
  85                                 delete first;
  86                                 first = new Service( *consumer );
  87                         }
  88                 }
  89                 delete it;
  90         }
  91         return 0;
  92 }
  93