7f11c3bf79f354c2dc11d989207fc71bade89a07
2 * \file mlt_transition.h
3 * \brief abstraction for all transition services
5 * Copyright (C) 2003-2008 Ushodaya Enterprises Limited
6 * \author Charles Yates <charles.yates@pandora.be>
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #ifndef _MLT_TRANSITION_H_
24 #define _MLT_TRANSITION_H_
26 #include "mlt_service.h"
28 /** \brief Transition abstract service class
30 * A transition may modify the output of a producer based on the output of a second producer.
32 * \extends mlt_service_s
33 * \properties \em a_track the track index (0-based) of a multitrack of the first producer
34 * \properties \em b_track the track index (0-based) of a multitrack of the second producer
35 * \properties \em accepts_blanks a flag to indicate if the transition should accept blank frames
36 * \properties \em always_active a flag to indicate that the in and out points do not apply
37 * \properties \em _transition_type 1 for video, 2 for audio
40 struct mlt_transition_s
42 /** We're implementing service here */
43 struct mlt_service_s parent
;
46 void ( *close
)( mlt_transition
);
48 /** protected transition method */
49 mlt_frame ( *process
)( mlt_transition
, mlt_frame
, mlt_frame
);
54 /** track and in/out points */
62 #define MLT_TRANSITION_SERVICE( transition ) ( &( transition )->parent )
63 #define MLT_TRANSITION_PROPERTIES( transition ) MLT_SERVICE_PROPERTIES( MLT_TRANSITION_SERVICE( transition ) )
65 extern int mlt_transition_init( mlt_transition self
, void *child
);
66 extern mlt_transition
mlt_transition_new( );
67 extern mlt_service
mlt_transition_service( mlt_transition self
);
68 extern mlt_properties
mlt_transition_properties( mlt_transition self
);
69 extern int mlt_transition_connect( mlt_transition self
, mlt_service producer
, int a_track
, int b_track
);
70 extern void mlt_transition_set_in_and_out( mlt_transition self
, mlt_position in
, mlt_position out
);
71 extern int mlt_transition_get_a_track( mlt_transition self
);
72 extern int mlt_transition_get_b_track( mlt_transition self
);
73 extern mlt_position
mlt_transition_get_in( mlt_transition self
);
74 extern mlt_position
mlt_transition_get_out( mlt_transition self
);
75 extern mlt_frame
mlt_transition_process( mlt_transition self
, mlt_frame a_frame
, mlt_frame b_frame
);
76 extern void mlt_transition_close( mlt_transition self
);