2 * mlt_field.c -- A field for planting multiple transitions and filters
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
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.
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.
21 #include "mlt_field.h"
22 #include "mlt_service.h"
23 #include "mlt_filter.h"
24 #include "mlt_transition.h"
25 #include "mlt_multitrack.h"
26 #include "mlt_tractor.h"
31 /** Private structures.
36 // This is the producer we're connected to
40 mlt_multitrack multitrack;
48 We construct a multitrack and a tractor here.
51 mlt_field mlt_field_init( )
53 // Initialise the field
54 mlt_field this = calloc( sizeof( struct mlt_field_s ), 1 );
59 // Construct a multitrack
60 this->multitrack = mlt_multitrack_init( );
62 // Construct a tractor
63 this->tractor = mlt_tractor_init( );
65 // The first plant will be connected to the mulitrack
66 this->producer = mlt_multitrack_service( this->multitrack );
68 // Connect the tractor to the multitrack
69 mlt_tractor_connect( this->tractor, this->producer );
76 /** Get the service associated to this field.
79 mlt_service mlt_field_service( mlt_field this )
81 return this != NULL ? mlt_tractor_service( this->tractor ) : NULL;
84 /** Get the multi track.
87 mlt_multitrack mlt_field_multitrack( mlt_field this )
89 return this != NULL ? this->multitrack : NULL;
95 mlt_tractor mlt_field_tractor( mlt_field this )
97 return this != NULL ? this->tractor : NULL;
100 /** Get the properties associated to this field.
103 mlt_properties mlt_field_properties( mlt_field this )
105 return mlt_service_properties( mlt_field_service( this ) );
111 int mlt_field_plant_filter( mlt_field this, mlt_filter that, int track )
113 // Connect the filter to the last producer
114 int result = mlt_filter_connect( that, this->producer, track );
116 // If sucessful, then we'll use this for connecting in the future
119 // This is now the new producer
120 this->producer = mlt_filter_service( that );
122 // Reconnect tractor to new producer
123 mlt_tractor_connect( this->tractor, this->producer );
129 /** Plant a transition.
132 int mlt_field_plant_transition( mlt_field this, mlt_transition that, int a_track, int b_track )
134 // Connect the transition to the last producer
135 int result = mlt_transition_connect( that, this->producer, a_track, b_track );
137 // If sucessful, then we'll use this for connecting in the future
140 // This is now the new producer
141 this->producer = mlt_transition_service( that );
143 // Reconnect tractor to new producer
144 mlt_tractor_connect( this->tractor, this->producer );
153 void mlt_field_close( mlt_field this )