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_timecode( 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_timecode( properties, "in", 0.0 );
61 mlt_properties_set_timecode( properties, "out", 36000.0 );
62 mlt_properties_set_timecode( properties, "length", 36000.0 );
63 mlt_properties_set_int( properties, "known_length", 1 );
64 mlt_properties_set_double( properties, "aspect_ratio", 4.0 / 3.0 );
65 mlt_properties_set( properties, "log_id", "multitrack" );
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 time code.
93 int mlt_producer_seek( mlt_producer this, mlt_timecode timecode )
98 if ( timecode > mlt_producer_get_playtime( this ) )
99 timecode = mlt_producer_get_playtime( this );
102 mlt_properties_set_timecode( mlt_producer_properties( this ), "position", timecode );
104 // Calculate the absolute frame
105 double frame = ( mlt_producer_get_in( this ) + timecode ) * mlt_producer_get_fps( this );
106 mlt_properties_set_double( mlt_producer_properties( this ), "frame", floor( frame + 0.5 ) );
111 /** Seek to a specified absolute frame.
114 int mlt_producer_seek_frame( mlt_producer this, uint64_t frame )
116 // Calculate the time code
117 double timecode = ( frame / mlt_producer_get_fps( this ) ) - mlt_producer_get_in( this );
119 // If timecode is invalid, then seek on time
122 // Seek to the in point
123 mlt_producer_seek( this, 0 );
125 else if ( timecode > mlt_producer_get_playtime( this ) )
127 // Seek to the out point
128 mlt_producer_seek( this, mlt_producer_get_playtime( this ) );
133 mlt_properties_set_timecode( mlt_producer_properties( this ), "position", timecode );
135 // Set the absolute frame
136 mlt_properties_set_double( mlt_producer_properties( this ), "frame", frame );
142 /** Get the current time code.
145 mlt_timecode mlt_producer_position( mlt_producer this )
147 return mlt_properties_get_timecode( mlt_producer_properties( this ), "position" );
150 /** Get the current frame.
153 uint64_t mlt_producer_frame( mlt_producer this )
155 return mlt_properties_get_double( mlt_producer_properties( this ), "frame" );
158 /** Set the playing speed.
161 int mlt_producer_set_speed( mlt_producer this, double speed )
163 return mlt_properties_set_double( mlt_producer_properties( this ), "speed", speed );
166 /** Get the playing speed.
169 double mlt_producer_get_speed( mlt_producer this )
171 return mlt_properties_get_double( mlt_producer_properties( this ), "speed" );
174 /** Get the frames per second.
177 double mlt_producer_get_fps( mlt_producer this )
179 return mlt_properties_get_double( mlt_producer_properties( this ), "fps" );
182 /** Set the in and out points.
185 int mlt_producer_set_in_and_out( mlt_producer this, mlt_timecode in, mlt_timecode out )
187 // Correct ins and outs if necessary
190 if ( in > mlt_producer_get_length( this ) )
191 in = mlt_producer_get_length( this );
194 if ( out > mlt_producer_get_length( this ) )
195 out = mlt_producer_get_length( this );
197 // Swap ins and outs if wrong
206 mlt_properties_set_timecode( mlt_producer_properties( this ), "in", in );
207 mlt_properties_set_timecode( mlt_producer_properties( this ), "out", out );
209 // Seek to the in point
210 mlt_producer_seek( this, 0 );
215 /** Get the in point.
218 mlt_timecode mlt_producer_get_in( mlt_producer this )
220 return mlt_properties_get_timecode( mlt_producer_properties( this ), "in" );
223 /** Get the out point.
226 mlt_timecode mlt_producer_get_out( mlt_producer this )
228 return mlt_properties_get_timecode( mlt_producer_properties( this ), "out" );
231 /** Get the total play time.
234 mlt_timecode mlt_producer_get_playtime( mlt_producer this )
236 return mlt_producer_get_out( this ) - mlt_producer_get_in( this );
239 /** Get the total length of the producer.
242 mlt_timecode mlt_producer_get_length( mlt_producer this )
244 return mlt_properties_get_timecode( mlt_producer_properties( this ), "length" );
247 /** Prepare for next frame.
250 void mlt_producer_prepare_next( mlt_producer this )
252 mlt_producer_seek_frame( this, mlt_producer_frame( this ) + mlt_producer_get_speed( this ) );
258 static int producer_get_frame( mlt_service service, mlt_frame_ptr frame, int index )
261 mlt_producer this = service->child;
263 // A properly instatiated producer will have a get_frame method...
264 if ( this->get_frame != NULL )
266 // Get the frame from the implementation
267 result = this->get_frame( this, frame, index );
269 mlt_properties frame_properties = mlt_frame_properties( *frame );
270 double speed = mlt_producer_get_speed( this );
271 mlt_properties_set_double( frame_properties, "speed", speed );
275 // Generate a test frame
276 *frame = mlt_frame_init( );
279 result = mlt_frame_set_timecode( *frame, mlt_producer_position( this ) );
281 // Calculate the next timecode
282 mlt_producer_prepare_next( this );
285 // Copy the fps of the producer onto the frame
286 mlt_properties properties = mlt_frame_properties( *frame );
287 mlt_properties_set_double( properties, "fps", mlt_producer_get_fps( this ) );
292 /** Close the producer.
295 void mlt_producer_close( mlt_producer this )
297 if ( this->close != NULL )
300 mlt_service_close( &this->parent );