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_timecode( properties, "position", 0.0 );
56 mlt_properties_set_double( properties, "frame", 1 );
57 mlt_properties_set_double( properties, "fps", 25.0 );
58 mlt_properties_set_double( properties, "speed", 1.0 );
59 mlt_properties_set_timecode( properties, "in", 0.0 );
60 mlt_properties_set_timecode( properties, "out", 36000.0 );
61 mlt_properties_set_timecode( properties, "playtime", 36000.0 );
62 mlt_properties_set_timecode( properties, "length", 36000.0 );
64 // Override service get_frame
65 parent->get_frame = producer_get_frame;
71 /** Get the parent service object.
74 mlt_service mlt_producer_service( mlt_producer this )
79 /** Get the producer properties.
82 mlt_properties mlt_producer_properties( mlt_producer this )
84 return mlt_service_properties( &this->parent );
87 /** Seek to a specified time code.
90 int mlt_producer_seek( mlt_producer this, mlt_timecode timecode )
95 if ( timecode > mlt_producer_get_playtime( this ) )
96 timecode = mlt_producer_get_playtime( this );
99 mlt_properties_set_timecode( mlt_producer_properties( this ), "position", timecode );
101 // Calculate the absolute frame
102 double frame = ( mlt_producer_get_in( this ) + timecode ) * mlt_producer_get_fps( this );
103 mlt_properties_set_double( mlt_producer_properties( this ), "frame", floor( frame + 0.5 ) );
108 /** Seek to a specified absolute frame.
111 int mlt_producer_seek_frame( mlt_producer this, uint64_t frame )
113 // Calculate the time code
114 double timecode = ( frame / mlt_producer_get_fps( this ) ) - mlt_producer_get_in( this );
116 // If timecode is invalid, then seek on time
119 // Seek to the in point
120 mlt_producer_seek( this, 0 );
122 else if ( timecode > mlt_producer_get_playtime( this ) )
124 // Seek to the out point
125 mlt_producer_seek( this, mlt_producer_get_playtime( this ) );
130 mlt_properties_set_timecode( mlt_producer_properties( this ), "position", timecode );
132 // Set the absolute frame
133 mlt_properties_set_double( mlt_producer_properties( this ), "frame", frame );
139 /** Get the current time code.
142 mlt_timecode mlt_producer_position( mlt_producer this )
144 return mlt_properties_get_timecode( mlt_producer_properties( this ), "position" );
147 /** Get the current frame.
150 uint64_t mlt_producer_frame( mlt_producer this )
152 return mlt_properties_get_double( mlt_producer_properties( this ), "frame" );
155 /** Set the playing speed.
158 int mlt_producer_set_speed( mlt_producer this, double speed )
160 return mlt_properties_set_double( mlt_producer_properties( this ), "speed", speed );
163 /** Get the playing speed.
166 double mlt_producer_get_speed( mlt_producer this )
168 return mlt_properties_get_double( mlt_producer_properties( this ), "speed" );
171 /** Get the frames per second.
174 double mlt_producer_get_fps( mlt_producer this )
176 return mlt_properties_get_double( mlt_producer_properties( this ), "fps" );
179 /** Set the in and out points.
182 int mlt_producer_set_in_and_out( mlt_producer this, mlt_timecode in, mlt_timecode out )
184 // Correct ins and outs if necessary
187 if ( in > mlt_producer_get_length( this ) )
188 in = mlt_producer_get_length( this );
191 if ( out > mlt_producer_get_length( this ) )
192 out = mlt_producer_get_length( this );
194 // Swap ins and outs if wrong
203 mlt_properties_set_timecode( mlt_producer_properties( this ), "in", in );
204 mlt_properties_set_timecode( mlt_producer_properties( this ), "out", out );
205 mlt_properties_set_timecode( mlt_producer_properties( this ), "playtime", out - in );
207 // Seek to the in point
208 mlt_producer_seek( this, 0 );
213 /** Get the in point.
216 mlt_timecode mlt_producer_get_in( mlt_producer this )
218 return mlt_properties_get_timecode( mlt_producer_properties( this ), "in" );
221 /** Get the out point.
224 mlt_timecode mlt_producer_get_out( mlt_producer this )
226 return mlt_properties_get_timecode( mlt_producer_properties( this ), "out" );
229 /** Get the total play time.
232 mlt_timecode mlt_producer_get_playtime( mlt_producer this )
234 return mlt_properties_get_timecode( mlt_producer_properties( this ), "playtime" );
237 /** Get the total length of the producer.
240 mlt_timecode mlt_producer_get_length( mlt_producer this )
242 return mlt_properties_get_timecode( mlt_producer_properties( this ), "length" );
245 /** Prepare for next frame.
248 void mlt_producer_prepare_next( mlt_producer this )
250 mlt_producer_seek_frame( this, mlt_producer_frame( this ) + mlt_producer_get_speed( this ) );
256 static int producer_get_frame( mlt_service service, mlt_frame_ptr frame, int index )
259 mlt_producer this = service->child;
261 // A properly instatiated producer will have a get_frame method...
262 if ( this->get_frame != NULL )
264 // Get the frame from the implementation
265 result = this->get_frame( this, frame, index );
269 // Generate a test frame
270 *frame = mlt_frame_init( );
273 result = mlt_frame_set_timecode( *frame, mlt_producer_position( this ) );
275 // Calculate the next timecode
276 mlt_producer_prepare_next( this );
282 /** Close the producer.
285 void mlt_producer_close( mlt_producer this )
287 if ( this->close != NULL )
290 mlt_service_close( &this->parent );