research.m1stereo.tv/gitweb/ - melted/blob - src/framework/mlt_transition.h

   1 /**
   2  * \file mlt_transition.h
   3  * \brief abstraction for all transition services
   4  *
   5  * Copyright (C) 2003-2008 Ushodaya Enterprises Limited
   6  * \author Charles Yates <charles.yates@pandora.be>
   7  *
   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.
  12  *
  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.
  17  *
  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
  21  */
  22
  23 #ifndef _MLT_TRANSITION_H_
  24 #define _MLT_TRANSITION_H_
  25
  26 #include "mlt_service.h"
  27
  28 /** \brief Transition abstract service class
  29  *
  30  * \extends mlt_service_s
  31  */
  32
  33 struct mlt_transition_s
  34 {
  35         /* We're implementing service here */
  36         struct mlt_service_s parent;
  37
  38         /* public virtual */
  39         void ( *close )( mlt_transition );
  40
  41         /* protected transition method */
  42         mlt_frame ( *process )( mlt_transition, mlt_frame, mlt_frame );
  43
  44         /* Protected */
  45         void *child;
  46
  47         /* track and in/out points */
  48         mlt_service producer;
  49
  50         /* Private */
  51         mlt_frame *frames;
  52         int held;
  53 };
  54
  55 /** Public final methods
  56 */
  57
  58 #define MLT_TRANSITION_SERVICE( transition )            ( &( transition )->parent )
  59 #define MLT_TRANSITION_PROPERTIES( transition )         MLT_SERVICE_PROPERTIES( MLT_TRANSITION_SERVICE( transition ) )
  60
  61 extern int mlt_transition_init( mlt_transition self, void *child );
  62 extern mlt_transition mlt_transition_new( );
  63 extern mlt_service mlt_transition_service( mlt_transition self );
  64 extern mlt_properties mlt_transition_properties( mlt_transition self );
  65 extern int mlt_transition_connect( mlt_transition self, mlt_service producer, int a_track, int b_track );
  66 extern void mlt_transition_set_in_and_out( mlt_transition self, mlt_position in, mlt_position out );
  67 extern int mlt_transition_get_a_track( mlt_transition self );
  68 extern int mlt_transition_get_b_track( mlt_transition self );
  69 extern mlt_position mlt_transition_get_in( mlt_transition self );
  70 extern mlt_position mlt_transition_get_out( mlt_transition self );
  71 extern mlt_frame mlt_transition_process( mlt_transition self, mlt_frame a_frame, mlt_frame b_frame );
  72 extern void mlt_transition_close( mlt_transition self );
  73
  74 #endif