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
, "eof", "pause" );
65 mlt_properties_set( properties
, "resource", "<producer>" );
67 // Override service get_frame
68 parent
->get_frame
= producer_get_frame
;
74 /** Get the parent service object.
77 mlt_service
mlt_producer_service( mlt_producer
this )
82 /** Get the producer properties.
85 mlt_properties
mlt_producer_properties( mlt_producer
this )
87 return mlt_service_properties( &this->parent
);
90 /** Seek to a specified position.
93 int mlt_producer_seek( mlt_producer
this, mlt_position position
)
95 // Determine eof handling
96 char *eof
= mlt_properties_get( mlt_producer_properties( this ), "eof" );
101 else if ( !strcmp( eof
, "pause" ) && position
>= mlt_producer_get_playtime( this ) )
102 position
= mlt_producer_get_playtime( this ) - 1;
105 mlt_properties_set_position( mlt_producer_properties( this ), "position", position
);
107 // Calculate the absolute frame
108 mlt_properties_set_position( mlt_producer_properties( this ), "frame", mlt_producer_get_in( this ) + position
);
113 /** Get the current position (relative to in point).
116 mlt_position
mlt_producer_position( mlt_producer
this )
118 //char *resource = mlt_properties_get( mlt_producer_properties( this ), "resource" );
119 //mlt_position frame = mlt_properties_get_position( mlt_producer_properties( this ), "frame" );
120 //mlt_position position = mlt_properties_get_position( mlt_producer_properties( this ), "position" );
121 //fprintf( stderr, "%s: %lld %lld\n", resource, frame, position );
122 return mlt_properties_get_position( mlt_producer_properties( this ), "position" );
125 /** Get the current position (relative to start of producer).
128 mlt_position
mlt_producer_frame( mlt_producer
this )
130 return mlt_properties_get_position( mlt_producer_properties( this ), "frame" );
133 /** Set the playing speed.
136 int mlt_producer_set_speed( mlt_producer
this, double speed
)
138 return mlt_properties_set_double( mlt_producer_properties( this ), "speed", speed
);
141 /** Get the playing speed.
144 double mlt_producer_get_speed( mlt_producer
this )
146 return mlt_properties_get_double( mlt_producer_properties( this ), "speed" );
149 /** Get the frames per second.
152 double mlt_producer_get_fps( mlt_producer
this )
154 return mlt_properties_get_double( mlt_producer_properties( this ), "fps" );
157 /** Set the in and out points.
160 int mlt_producer_set_in_and_out( mlt_producer
this, mlt_position in
, mlt_position out
)
162 // Correct ins and outs if necessary
165 else if ( in
> mlt_producer_get_length( this ) )
166 in
= mlt_producer_get_length( this );
170 else if ( out
> mlt_producer_get_length( this ) )
171 out
= mlt_producer_get_length( this );
173 // Swap ins and outs if wrong
182 mlt_properties_set_position( mlt_producer_properties( this ), "in", in
);
183 mlt_properties_set_position( mlt_producer_properties( this ), "out", out
);
188 /** Get the in point.
191 mlt_position
mlt_producer_get_in( mlt_producer
this )
193 return mlt_properties_get_position( mlt_producer_properties( this ), "in" );
196 /** Get the out point.
199 mlt_position
mlt_producer_get_out( mlt_producer
this )
201 return mlt_properties_get_position( mlt_producer_properties( this ), "out" );
204 /** Get the total play time.
207 mlt_position
mlt_producer_get_playtime( mlt_producer
this )
209 return mlt_producer_get_out( this ) - mlt_producer_get_in( this ) + 1;
212 /** Get the total length of the producer.
215 mlt_position
mlt_producer_get_length( mlt_producer
this )
217 return mlt_properties_get_position( mlt_producer_properties( this ), "length" );
220 /** Prepare for next frame.
223 void mlt_producer_prepare_next( mlt_producer
this )
225 mlt_producer_seek( this, mlt_producer_position( this ) + mlt_producer_get_speed( this ) );
231 static int producer_get_frame( mlt_service service
, mlt_frame_ptr frame
, int index
)
234 mlt_producer
this = service
->child
;
236 // Determine eof handling
237 char *eof
= mlt_properties_get( mlt_producer_properties( this ), "eof" );
239 // A properly instatiated producer will have a get_frame method...
240 if ( this->get_frame
== NULL
|| ( !strcmp( eof
, "continue" ) && mlt_producer_position( this ) > mlt_producer_get_out( this ) ) )
242 // Generate a test frame
243 *frame
= mlt_frame_init( );
246 result
= mlt_frame_set_position( *frame
, mlt_producer_position( this ) );
248 // Calculate the next position
249 mlt_producer_prepare_next( this );
253 // Get the frame from the implementation
254 result
= this->get_frame( this, frame
, index
);
257 // Copy the fps and speed of the producer onto the frame
258 mlt_properties properties
= mlt_frame_properties( *frame
);
259 mlt_properties_set_double( properties
, "fps", mlt_producer_get_fps( this ) );
260 double speed
= mlt_producer_get_speed( this );
261 mlt_properties_set_double( properties
, "speed", speed
);
266 /** Close the producer.
269 void mlt_producer_close( mlt_producer
this )
271 if ( this->close
!= NULL
)
274 mlt_service_close( &this->parent
);