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

   1 /**
   2  * \file mlt_tractor.h
   3  * \brief tractor service class
   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_TRACTOR_H_
  24 #define _MLT_TRACTOR_H_
  25
  26 #include "mlt_producer.h"
  27
  28 /** \brief Tractor class
  29  *
  30  * The tractor is a convenience class that works with the field class
  31  * to manage a multitrack, track filters, and transitions.
  32  *
  33  * \extends mlt_producer_s
  34  * \properties \em multitrack holds a reference to the mulitrack object that a tractor manages
  35  * \properties \em field holds a reference to the field object that a tractor manages
  36  * \properties \em producer holds a reference to an encapsulated producer
  37  * \properties \em global_feed a flag to indicate whether this tractor feeds to the consumer or stops here
  38  * \properties \em global_queue is something for the data_feed functionality in the core module
  39  * \properties \em data_queue is something for the data_feed functionality in the core module
  40  */
  41
  42 struct mlt_tractor_s
  43 {
  44         struct mlt_producer_s parent;
  45         mlt_service producer;
  46 };
  47
  48 #define MLT_TRACTOR_PRODUCER( tractor )         ( &( tractor )->parent )
  49 #define MLT_TRACTOR_SERVICE( tractor )          MLT_PRODUCER_SERVICE( MLT_TRACTOR_PRODUCER( tractor ) )
  50 #define MLT_TRACTOR_PROPERTIES( tractor )       MLT_SERVICE_PROPERTIES( MLT_TRACTOR_SERVICE( tractor ) )
  51
  52 extern mlt_tractor mlt_tractor_init( );
  53 extern mlt_tractor mlt_tractor_new( );
  54 extern mlt_service mlt_tractor_service( mlt_tractor self );
  55 extern mlt_producer mlt_tractor_producer( mlt_tractor self );
  56 extern mlt_properties mlt_tractor_properties( mlt_tractor self );
  57 extern mlt_field mlt_tractor_field( mlt_tractor self );
  58 extern mlt_multitrack mlt_tractor_multitrack( mlt_tractor self );
  59 extern int mlt_tractor_connect( mlt_tractor self, mlt_service service );
  60 extern void mlt_tractor_refresh( mlt_tractor self );
  61 extern int mlt_tractor_set_track( mlt_tractor self, mlt_producer producer, int index );
  62 extern mlt_producer mlt_tractor_get_track( mlt_tractor self, int index );
  63 extern void mlt_tractor_close( mlt_tractor self );
  64
  65 #endif