2 * mlt_tractor.c -- tractor service class
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.
23 #include "mlt_tractor.h"
24 #include "mlt_frame.h"
25 #include "mlt_multitrack.h"
30 /** Private structure.
35 struct mlt_producer_s parent
;
39 /** Forward references to static methods.
42 static int producer_get_frame( mlt_producer
this, mlt_frame_ptr frame
, int track
);
44 /** Constructor for the tractor.
46 TODO: thread this service...
49 mlt_tractor
mlt_tractor_init( )
51 mlt_tractor
this = calloc( sizeof( struct mlt_tractor_s
), 1 );
54 mlt_producer producer
= &this->parent
;
55 if ( mlt_producer_init( producer
, this ) == 0 )
57 producer
->get_frame
= producer_get_frame
;
68 /** Get the service object associated to the tractor.
71 mlt_service
mlt_tractor_service( mlt_tractor
this )
73 return mlt_producer_service( &this->parent
);
76 /** Get the producer object associated to the tractor.
79 mlt_producer
mlt_tractor_producer( mlt_tractor
this )
84 /** Get the properties object associated to the tractor.
87 mlt_properties
mlt_tractor_properties( mlt_tractor
this )
89 return mlt_producer_properties( &this->parent
);
92 /** Connect the tractor.
95 int mlt_tractor_connect( mlt_tractor
this, mlt_service producer
)
97 int ret
= mlt_service_connect_producer( mlt_tractor_service( this ), producer
, 0 );
99 // This is the producer we're going to connect to
101 this->producer
= producer
;
106 /** Get the next frame.
108 TODO: This should be reading a pump being populated by the thread...
111 static int producer_get_frame( mlt_producer parent
, mlt_frame_ptr frame
, int track
)
113 mlt_tractor
this = parent
->child
;
115 // We only respond to the first track requests
116 if ( track
== 0 && this->producer
!= NULL
)
123 // Get the properties of the parent producer
124 mlt_properties properties
= mlt_producer_properties( parent
);
126 // Try to obtain the multitrack associated to the tractor
127 mlt_multitrack multitrack
= mlt_properties_get_data( properties
, "multitrack", NULL
);
129 // If we don't have one, we're in trouble...
130 if ( multitrack
!= NULL
)
132 mlt_producer target
= mlt_multitrack_producer( multitrack
);
133 mlt_producer_seek( target
, mlt_producer_frame( parent
) );
134 mlt_producer_set_speed( target
, mlt_producer_get_speed( parent
) );
135 mlt_producer_set_in_and_out( parent
, mlt_producer_get_in( target
), mlt_producer_get_out( target
) );
139 fprintf( stderr
, "tractor without a multitrack!!\n" );
142 // Loop through each of the tracks we're harvesting
143 for ( i
= 0; !done
; i
++ )
145 // Get a frame from the producer
146 mlt_service_get_frame( this->producer
, &temp
, i
);
148 // Check for last track
149 done
= mlt_properties_get_int( mlt_frame_properties( temp
), "last_track" );
152 if ( done
&& looking
)
154 // Use this as output if we don't have one already
157 else if ( !mlt_frame_is_test_card( temp
) && looking
)
159 // This is the one we want and we can stop looking
165 // We discard all other frames
166 mlt_frame_close( temp
);
170 // Prepare the next frame
171 mlt_producer_prepare_next( parent
);
173 // Indicate our found status
178 // Generate a test card
179 *frame
= mlt_frame_init( );
184 /** Close the tractor.
187 void mlt_tractor_close( mlt_tractor
this )
189 mlt_producer_close( &this->parent
);