2 * mlt_producer.c -- abstraction for all producer services
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.
22 #include "mlt_producer.h"
23 #include "mlt_frame.h"
29 /** Forward references.
32 static int producer_get_frame( mlt_service
this, mlt_frame_ptr frame
, int index
);
37 int mlt_producer_init( mlt_producer
this, void *child
)
39 // Initialise the producer
40 memset( this, 0, sizeof( struct mlt_producer_s
) );
42 // Associate with the child
45 // Initialise the service
46 if ( mlt_service_init( &this->parent
, this ) == 0 )
48 // The parent is the service
49 mlt_service parent
= &this->parent
;
51 // Get the properties of the parent
52 mlt_properties properties
= mlt_service_properties( parent
);
54 // Set the default properties
55 mlt_properties_set( properties
, "mlt_type", "mlt_producer" );
56 mlt_properties_set_position( properties
, "position", 0.0 );
57 mlt_properties_set_double( properties
, "frame", 0 );
58 mlt_properties_set_double( properties
, "fps", 25.0 );
59 mlt_properties_set_double( properties
, "speed", 1.0 );
60 mlt_properties_set_position( properties
, "in", 0 );
61 mlt_properties_set_position( properties
, "out", 1799999 );
62 mlt_properties_set_position( properties
, "length", 1800000 );
63 mlt_properties_set_double( properties
, "aspect_ratio", 4.0 / 3.0 );
64 mlt_properties_set( properties
, "log_id", "multitrack" );
66 // Override service get_frame
67 parent
->get_frame
= producer_get_frame
;
73 /** Get the parent service object.
76 mlt_service
mlt_producer_service( mlt_producer
this )
81 /** Get the producer properties.
84 mlt_properties
mlt_producer_properties( mlt_producer
this )
86 return mlt_service_properties( &this->parent
);
89 /** Seek to a specified position.
92 int mlt_producer_seek( mlt_producer
this, mlt_position position
)
97 else if ( position
> mlt_producer_get_playtime( this ) )
98 position
= mlt_producer_get_playtime( this ) - 1;
101 mlt_properties_set_position( mlt_producer_properties( this ), "position", position
);
103 // Calculate the absolute frame
104 mlt_properties_set_position( mlt_producer_properties( this ), "frame", mlt_producer_get_in( this ) + position
);
109 /** Get the current position (relative to in point).
112 mlt_position
mlt_producer_position( mlt_producer
this )
114 return mlt_properties_get_position( mlt_producer_properties( this ), "position" );
117 /** Get the current position (relative to start of producer).
120 mlt_position
mlt_producer_frame( mlt_producer
this )
122 return mlt_properties_get_double( mlt_producer_properties( this ), "frame" );
125 /** Set the playing speed.
128 int mlt_producer_set_speed( mlt_producer
this, double speed
)
130 return mlt_properties_set_double( mlt_producer_properties( this ), "speed", speed
);
133 /** Get the playing speed.
136 double mlt_producer_get_speed( mlt_producer
this )
138 return mlt_properties_get_double( mlt_producer_properties( this ), "speed" );
141 /** Get the frames per second.
144 double mlt_producer_get_fps( mlt_producer
this )
146 return mlt_properties_get_double( mlt_producer_properties( this ), "fps" );
149 /** Set the in and out points.
152 int mlt_producer_set_in_and_out( mlt_producer
this, mlt_position in
, mlt_position out
)
154 // Correct ins and outs if necessary
157 else if ( in
> mlt_producer_get_length( this ) )
158 in
= mlt_producer_get_length( this );
162 else if ( out
> mlt_producer_get_length( this ) )
163 out
= mlt_producer_get_length( this );
165 // Swap ins and outs if wrong
174 mlt_properties_set_position( mlt_producer_properties( this ), "in", in
);
175 mlt_properties_set_position( mlt_producer_properties( this ), "out", out
);
180 /** Get the in point.
183 mlt_position
mlt_producer_get_in( mlt_producer
this )
185 return mlt_properties_get_position( mlt_producer_properties( this ), "in" );
188 /** Get the out point.
191 mlt_position
mlt_producer_get_out( mlt_producer
this )
193 return mlt_properties_get_position( mlt_producer_properties( this ), "out" );
196 /** Get the total play time.
199 mlt_position
mlt_producer_get_playtime( mlt_producer
this )
201 return mlt_producer_get_out( this ) - mlt_producer_get_in( this ) + 1;
204 /** Get the total length of the producer.
207 mlt_position
mlt_producer_get_length( mlt_producer
this )
209 return mlt_properties_get_position( mlt_producer_properties( this ), "length" );
212 /** Prepare for next frame.
215 void mlt_producer_prepare_next( mlt_producer
this )
217 mlt_producer_seek( this, mlt_producer_frame( this ) + mlt_producer_get_speed( this ) );
223 static int producer_get_frame( mlt_service service
, mlt_frame_ptr frame
, int index
)
226 mlt_producer
this = service
->child
;
228 // A properly instatiated producer will have a get_frame method...
229 if ( this->get_frame
!= NULL
)
231 // Get the frame from the implementation
232 result
= this->get_frame( this, frame
, index
);
236 // Generate a test frame
237 *frame
= mlt_frame_init( );
240 result
= mlt_frame_set_position( *frame
, mlt_producer_position( this ) );
242 // Calculate the next position
243 mlt_producer_prepare_next( this );
246 // Copy the fps and speed of the producer onto the frame
247 mlt_properties properties
= mlt_frame_properties( *frame
);
248 mlt_properties_set_double( properties
, "fps", mlt_producer_get_fps( this ) );
249 double speed
= mlt_producer_get_speed( this );
250 mlt_properties_set_double( properties
, "speed", speed
);
255 /** Close the producer.
258 void mlt_producer_close( mlt_producer
this )
260 if ( this->close
!= NULL
)
263 mlt_service_close( &this->parent
);