+++ /dev/null
-/**
- * \file mlt_field.c
- * \brief a field for planting multiple transitions and filters
- * \see mlt_field_s
- *
- * Copyright (C) 2003-2009 Ushodaya Enterprises Limited
- * \author Charles Yates <charles.yates@pandora.be>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
-#include "mlt_field.h"
-#include "mlt_service.h"
-#include "mlt_filter.h"
-#include "mlt_transition.h"
-#include "mlt_multitrack.h"
-#include "mlt_tractor.h"
-
-#include <stdlib.h>
-#include <string.h>
-
-/** \brief Field class
- *
- * The field is a convenience class that works with the tractor and multitrack classes to manage track filters and transitions.
- */
-
-struct mlt_field_s
-{
- /// This is the producer we're connected to
- mlt_service producer;
-
- /// Multitrack
- mlt_multitrack multitrack;
-
- /// Tractor
- mlt_tractor tractor;
-};
-
-/** Construct a field, mulitrack, and tractor.
- *
- * \public \memberof mlt_field_s
- * \return a new field
- */
-
-mlt_field mlt_field_init( )
-{
- // Initialise the field
- mlt_field this = calloc( sizeof( struct mlt_field_s ), 1 );
-
- // Initialise it
- if ( this != NULL )
- {
- // Construct a multitrack
- this->multitrack = mlt_multitrack_init( );
-
- // Construct a tractor
- this->tractor = mlt_tractor_init( );
-
- // The first plant will be connected to the mulitrack
- this->producer = MLT_MULTITRACK_SERVICE( this->multitrack );
-
- // Connect the tractor to the multitrack
- mlt_tractor_connect( this->tractor, this->producer );
- }
-
- // Return this
- return this;
-}
-
-/** Construct a field and initialize with supplied multitrack and tractor.
- *
- * \public \memberof mlt_field_s
- * \param multitrack a multitrack
- * \param tractor a tractor
- * \return a new field
- */
-
-mlt_field mlt_field_new( mlt_multitrack multitrack, mlt_tractor tractor )
-{
- // Initialise the field
- mlt_field this = calloc( sizeof( struct mlt_field_s ), 1 );
-
- // Initialise it
- if ( this != NULL )
- {
- // Construct a multitrack
- this->multitrack = multitrack;
-
- // Construct a tractor
- this->tractor = tractor;
-
- // The first plant will be connected to the mulitrack
- this->producer = MLT_MULTITRACK_SERVICE( this->multitrack );
-
- // Connect the tractor to the multitrack
- mlt_tractor_connect( this->tractor, this->producer );
- }
-
- // Return this
- return this;
-}
-
-/** Get the service associated to this field.
- *
- * \public \memberof mlt_field_s
- * \param this a field
- * \return the tractor as a service
- */
-
-mlt_service mlt_field_service( mlt_field this )
-{
- return MLT_TRACTOR_SERVICE( this->tractor );
-}
-
-/** Get the multitrack.
- *
- * \public \memberof mlt_field_s
- * \param this a field
- * \return the multitrack
- */
-
-mlt_multitrack mlt_field_multitrack( mlt_field this )
-{
- return this != NULL ? this->multitrack : NULL;
-}
-
-/** Get the tractor.
- *
- * \public \memberof mlt_field_s
- * \param this a field
- * \return the tractor
- */
-
-mlt_tractor mlt_field_tractor( mlt_field this )
-{
- return this != NULL ? this->tractor : NULL;
-}
-
-/** Get the properties associated to this field.
- *
- * \public \memberof mlt_field_s
- * \param this a field
- * \return a properties list
- */
-
-mlt_properties mlt_field_properties( mlt_field this )
-{
- return MLT_SERVICE_PROPERTIES( mlt_field_service( this ) );
-}
-
-/** Plant a filter.
- *
- * \public \memberof mlt_field_s
- * \param this a field
- * \param that a filter
- * \param track the track index
- * \return true if there was an error
- */
-
-int mlt_field_plant_filter( mlt_field this, mlt_filter that, int track )
-{
- // Connect the filter to the last producer
- int result = mlt_filter_connect( that, this->producer, track );
-
- // If sucessful, then we'll use this for connecting in the future
- if ( result == 0 )
- {
- // This is now the new producer
- this->producer = MLT_FILTER_SERVICE( that );
-
- // Reconnect tractor to new producer
- mlt_tractor_connect( this->tractor, this->producer );
-
- // Fire an event
- mlt_events_fire( mlt_field_properties( this ), "service-changed", NULL );
- }
-
- return result;
-}
-
-/** Plant a transition.
- *
- * \public \memberof mlt_field_s
- * \param this a field
- * \param that a transition
- * \param a_track input A's track index
- * \param b_track input B's track index
- * \return true if there was an error
- */
-
-int mlt_field_plant_transition( mlt_field this, mlt_transition that, int a_track, int b_track )
-{
- // Connect the transition to the last producer
- int result = mlt_transition_connect( that, this->producer, a_track, b_track );
-
- // If sucessful, then we'll use this for connecting in the future
- if ( result == 0 )
- {
- // This is now the new producer
- this->producer = MLT_TRANSITION_SERVICE( that );
-
- // Reconnect tractor to new producer
- mlt_tractor_connect( this->tractor, this->producer );
-
- // Fire an event
- mlt_events_fire( mlt_field_properties( this ), "service-changed", NULL );
- }
-
- return 0;
-}
-
-/** Close the field.
- *
- * \public \memberof mlt_field_s
- * \param this a field
- */
-
-void mlt_field_close( mlt_field this )
-{
- if ( this != NULL && mlt_properties_dec_ref( mlt_field_properties( this ) ) <= 0 )
- {
- //mlt_tractor_close( this->tractor );
- //mlt_multitrack_close( this->multitrack );
- free( this );
- }
-}
-
-/** Remove a filter or transition from the field.
- *
- * \public \memberof mlt_field_s
- * \param self a field
- * \param service the filter or transition to remove
- */
-
-void mlt_field_disconnect_service( mlt_field self, mlt_service service )
-{
- mlt_service p = mlt_service_producer( service );
- mlt_service c = mlt_service_consumer( service);
- int i;
- switch ( mlt_service_identify(c) )
- {
- case filter_type:
- i = mlt_filter_get_track( MLT_FILTER(c) );
- mlt_service_connect_producer( c, p, i );
- break;
- case transition_type:
- i = mlt_transition_get_a_track ( MLT_TRANSITION(c) );
- mlt_service_connect_producer( c, p, i );
- MLT_TRANSITION(c)->producer = p;
- break;
- case tractor_type:
- self->producer = p;
- mlt_tractor_connect( MLT_TRACTOR(c), p );
- default:
- break;
- }
- mlt_events_fire( mlt_field_properties( self ), "service-changed", NULL );
-}
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