2 * mlt_tractor.c -- tractor service class
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 #include "mlt_tractor.h"
24 #include "mlt_frame.h"
25 #include "mlt_multitrack.h"
31 /** Private structure.
36 struct mlt_producer_s parent;
40 /** Forward references to static methods.
43 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int track );
44 static void producer_close( mlt_producer this );
46 /** Constructor for the tractor.
48 TODO: thread this service...
51 mlt_tractor mlt_tractor_init( )
53 mlt_tractor this = calloc( sizeof( struct mlt_tractor_s ), 1 );
56 mlt_producer producer = &this->parent;
57 if ( mlt_producer_init( producer, this ) == 0 )
59 mlt_properties_set( mlt_producer_properties( producer ), "resource", "<tractor>" );
60 mlt_properties_set( mlt_producer_properties( producer ), "mlt_type", "mlt_producer" );
61 mlt_properties_set( mlt_producer_properties( producer ), "mlt_service", "tractor" );
63 producer->get_frame = producer_get_frame;
64 producer->close = producer_close;
75 /** Get the service object associated to the tractor.
78 mlt_service mlt_tractor_service( mlt_tractor this )
80 return mlt_producer_service( &this->parent );
83 /** Get the producer object associated to the tractor.
86 mlt_producer mlt_tractor_producer( mlt_tractor this )
91 /** Get the properties object associated to the tractor.
94 mlt_properties mlt_tractor_properties( mlt_tractor this )
96 return mlt_producer_properties( &this->parent );
99 /** Connect the tractor.
102 int mlt_tractor_connect( mlt_tractor this, mlt_service producer )
104 int ret = mlt_service_connect_producer( mlt_tractor_service( this ), producer, 0 );
106 // This is the producer we're going to connect to
108 this->producer = producer;
113 /** Get the next frame.
115 TODO: This should be reading a pump being populated by the thread...
118 static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int track )
120 mlt_tractor this = parent->child;
122 // We only respond to the first track requests
123 if ( track == 0 && this->producer != NULL )
128 mlt_frame temp = NULL;
129 mlt_frame store[ 10 ];
132 // Get the properties of the parent producer
133 mlt_properties properties = mlt_producer_properties( parent );
135 // Try to obtain the multitrack associated to the tractor
136 mlt_multitrack multitrack = mlt_properties_get_data( properties, "multitrack", NULL );
138 // Or a specific producer
139 mlt_producer producer = mlt_properties_get_data( properties, "producer", NULL );
141 // If we don't have one, we're in trouble...
142 if ( multitrack != NULL )
144 mlt_producer target = mlt_multitrack_producer( multitrack );
145 mlt_producer_seek( target, mlt_producer_frame( parent ) );
146 mlt_producer_set_speed( target, mlt_producer_get_speed( parent ) );
148 // Loop through each of the tracks we're harvesting
149 for ( i = 0; !done; i ++ )
151 // Get a frame from the producer
152 mlt_service_get_frame( this->producer, &temp, i );
154 // Check for last track
155 done = mlt_properties_get_int( mlt_frame_properties( temp ), "last_track" );
158 if ( done && looking )
160 // Use this as output if we don't have one already
163 else if ( ( !mlt_frame_is_test_card( temp ) || !mlt_frame_is_test_audio( temp ) ) && looking &&
164 mlt_producer_frame( parent ) == mlt_frame_get_position( temp ) )
171 // We store all other frames for now
172 store[ count ++ ] = temp;
176 // Now place all the unused frames on to the properties (will be destroyed automatically)
179 mlt_properties frame_properties = mlt_frame_properties( *frame );
181 sprintf( label, "tractor_%d", count );
182 while ( mlt_properties_get_data( frame_properties, label, NULL ) != NULL )
183 strcat( label, "+" );
184 mlt_properties_set_data( frame_properties, label, store[ count ], 0, ( mlt_destructor )mlt_frame_close, NULL );
187 else if ( producer != NULL )
189 mlt_producer_seek( producer, mlt_producer_frame( parent ) );
190 mlt_producer_set_speed( producer, mlt_producer_get_speed( parent ) );
191 mlt_service_get_frame( this->producer, frame, track );
195 fprintf( stderr, "tractor without a multitrack!!\n" );
196 mlt_service_get_frame( this->producer, frame, track );
199 // Prepare the next frame
200 mlt_producer_prepare_next( parent );
202 // Indicate our found status
207 // Generate a test card
208 *frame = mlt_frame_init( );
213 /** Close the tractor.
216 void mlt_tractor_close( mlt_tractor this )
218 this->parent.close = NULL;
219 mlt_producer_close( &this->parent );
223 /** Close the producer.
226 static void producer_close( mlt_producer this )
228 mlt_tractor_close( this->child );