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( Consumer &consumer ) :
  32         Consumer( consumer )
  33 {
  34         // Create a reference to the first service
  35         first = new Service( *this );
  36 }
  37
  38 FilteredConsumer::~FilteredConsumer( )
  39 {
  40         // Delete the reference to the first service
  41         delete first;
  42 }
  43
  44 int FilteredConsumer::connect( Service &service )
  45 {
  46         // All producers must connect to the first service, hence the use of the virtual here
  47         return first->connect_producer( service );
  48 }
  49
  50 int FilteredConsumer::attach( Filter &filter )
  51 {
  52         int error = 0;
  53         if ( filter.is_valid( ) )
  54         {
  55                 Service *producer = first->producer( );
  56                 error = filter.connect( *producer );
  57                 if ( error == 0 )
  58                 {
  59                         first->connect_producer( filter );
  60                         delete first;
  61                         first = new Service( filter );
  62                 }
  63                 delete producer;
  64         }
  65         else
  66         {
  67                 error = 1;
  68         }
  69         return error;
  70 }
  71
  72 int FilteredConsumer::last( Filter &filter )
  73 {
  74         int error = 0;
  75         if ( filter.is_valid( ) )
  76         {
  77                 Service *producer = this->producer( );
  78                 error = filter.connect( *producer );
  79                 if ( error == 0 )
  80                         connect_producer( filter );
  81                 delete producer;
  82         }
  83         else
  84         {
  85                 error = 1;
  86         }
  87         return error;
  88 }
  89
  90 int FilteredConsumer::detach( Filter &filter )
  91 {
  92         if ( filter.is_valid( ) )
  93         {
  94                 Service *it = new Service( *first );
  95                 while ( it->is_valid( ) && it->get_service( ) != filter.get_service( ) )
  96                 {
  97                         Service *consumer = it->consumer( );
  98                         delete it;
  99                         it = consumer;
 100                 }
 101                 if ( it->get_service( ) == filter.get_service( ) )
 102                 {
 103                         Service *producer = it->producer( );
 104                         Service *consumer = it->consumer( );
 105                         consumer->connect_producer( *producer );
 106                         Service dummy( NULL );
 107                         it->connect_producer( dummy );
 108                         if ( first->get_service( ) == it->get_service( ) )
 109                         {
 110                                 delete first;
 111                                 first = new Service( *consumer );
 112                         }
 113                 }
 114                 delete it;
 115         }
 116         return 0;
 117 }
 118