Constness changes
[melted] / src / framework / mlt_transition.h
1 /**
2 * \file mlt_transition.h
3 * \brief abstraction for all transition services
4 * \see mlt_transition_s
5 *
6 * Copyright (C) 2003-2009 Ushodaya Enterprises Limited
7 * \author Charles Yates <charles.yates@pandora.be>
8 *
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24 #ifndef _MLT_TRANSITION_H_
25 #define _MLT_TRANSITION_H_
26
27 #include "mlt_service.h"
28
29 /** \brief Transition abstract service class
30 *
31 * A transition may modify the output of a producer based on the output of a second producer.
32 *
33 * \extends mlt_service_s
34 * \properties \em a_track the track index (0-based) of a multitrack of the first producer
35 * \properties \em b_track the track index (0-based) of a multitrack of the second producer
36 * \properties \em accepts_blanks a flag to indicate if the transition should accept blank frames
37 * \properties \em always_active a flag to indicate that the in and out points do not apply
38 * \properties \em _transition_type 1 for video, 2 for audio
39 */
40
41 struct mlt_transition_s
42 {
43 /** We're implementing service here */
44 struct mlt_service_s parent;
45
46 /** public virtual */
47 void ( *close )( mlt_transition );
48
49 /** protected transition method */
50 mlt_frame ( *process )( mlt_transition, mlt_frame, mlt_frame );
51
52 /** Protected */
53 void *child;
54
55 /** track and in/out points */
56 mlt_service producer;
57
58 /** Private */
59 mlt_frame *frames;
60 int held;
61 };
62
63 #define MLT_TRANSITION_SERVICE( transition ) ( &( transition )->parent )
64 #define MLT_TRANSITION_PROPERTIES( transition ) MLT_SERVICE_PROPERTIES( MLT_TRANSITION_SERVICE( transition ) )
65
66 extern int mlt_transition_init( mlt_transition self, void *child );
67 extern mlt_transition mlt_transition_new( );
68 extern mlt_service mlt_transition_service( mlt_transition self );
69 extern mlt_properties mlt_transition_properties( mlt_transition self );
70 extern int mlt_transition_connect( mlt_transition self, mlt_service producer, int a_track, int b_track );
71 extern void mlt_transition_set_in_and_out( mlt_transition self, mlt_position in, mlt_position out );
72 extern int mlt_transition_get_a_track( mlt_transition self );
73 extern int mlt_transition_get_b_track( mlt_transition self );
74 extern mlt_position mlt_transition_get_in( mlt_transition self );
75 extern mlt_position mlt_transition_get_out( mlt_transition self );
76 extern mlt_frame mlt_transition_process( mlt_transition self, mlt_frame a_frame, mlt_frame b_frame );
77 extern void mlt_transition_close( mlt_transition self );
78
79 #endif