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 // Check that we haven't received NULL
40 int error = this == NULL;
42 // Continue if no error
45 // Initialise the producer
46 memset( this, 0, sizeof( struct mlt_producer_s ) );
48 // Associate with the child
51 // Initialise the service
52 if ( mlt_service_init( &this->parent, this ) == 0 )
54 // The parent is the service
55 mlt_service parent = &this->parent;
57 // Get the properties of the parent
58 mlt_properties properties = mlt_service_properties( parent );
60 // Set the default properties
61 mlt_properties_set( properties, "mlt_type", "mlt_producer" );
62 mlt_properties_set_position( properties, "_position", 0.0 );
63 mlt_properties_set_double( properties, "_frame", 0 );
64 mlt_properties_set_double( properties, "fps", 25.0 );
65 mlt_properties_set_double( properties, "_speed", 1.0 );
66 mlt_properties_set_position( properties, "in", 0 );
67 mlt_properties_set_position( properties, "out", 1799999 );
68 mlt_properties_set_position( properties, "length", 1800000 );
69 mlt_properties_set_double( properties, "aspect_ratio", 4.0 / 3.0 );
70 mlt_properties_set( properties, "eof", "pause" );
71 mlt_properties_set( properties, "resource", "<producer>" );
73 // Override service get_frame
74 parent->get_frame = producer_get_frame;
81 /** Get the parent service object.
84 mlt_service mlt_producer_service( mlt_producer this )
89 /** Get the producer properties.
92 mlt_properties mlt_producer_properties( mlt_producer this )
94 return mlt_service_properties( &this->parent );
97 /** Seek to a specified position.
100 int mlt_producer_seek( mlt_producer this, mlt_position position )
102 // Determine eof handling
103 char *eof = mlt_properties_get( mlt_producer_properties( this ), "eof" );
110 else if ( !strcmp( eof, "pause" ) && position >= mlt_producer_get_playtime( this ) )
112 mlt_producer_set_speed( this, 0 );
113 position = mlt_producer_get_playtime( this ) - 1;
115 else if ( !strcmp( eof, "loop" ) && position >= mlt_producer_get_playtime( this ) )
117 position = position % mlt_producer_get_playtime( this );
121 mlt_properties_set_position( mlt_producer_properties( this ), "_position", position );
123 // Calculate the absolute frame
124 mlt_properties_set_position( mlt_producer_properties( this ), "_frame", mlt_producer_get_in( this ) + position );
129 /** Get the current position (relative to in point).
132 mlt_position mlt_producer_position( mlt_producer this )
134 return mlt_properties_get_position( mlt_producer_properties( this ), "_position" );
137 /** Get the current position (relative to start of producer).
140 mlt_position mlt_producer_frame( mlt_producer this )
142 return mlt_properties_get_position( mlt_producer_properties( this ), "_frame" );
145 /** Set the playing speed.
148 int mlt_producer_set_speed( mlt_producer this, double speed )
150 return mlt_properties_set_double( mlt_producer_properties( this ), "_speed", speed );
153 /** Get the playing speed.
156 double mlt_producer_get_speed( mlt_producer this )
158 return mlt_properties_get_double( mlt_producer_properties( this ), "_speed" );
161 /** Get the frames per second.
164 double mlt_producer_get_fps( mlt_producer this )
166 return mlt_properties_get_double( mlt_producer_properties( this ), "fps" );
169 /** Set the in and out points.
172 int mlt_producer_set_in_and_out( mlt_producer this, mlt_position in, mlt_position out )
174 // Correct ins and outs if necessary
177 else if ( in > mlt_producer_get_length( this ) )
178 in = mlt_producer_get_length( this );
182 else if ( out > mlt_producer_get_length( this ) )
183 out = mlt_producer_get_length( this );
185 // Swap ins and outs if wrong
194 mlt_properties_set_position( mlt_producer_properties( this ), "in", in );
195 mlt_properties_set_position( mlt_producer_properties( this ), "out", out );
200 /** Get the in point.
203 mlt_position mlt_producer_get_in( mlt_producer this )
205 return mlt_properties_get_position( mlt_producer_properties( this ), "in" );
208 /** Get the out point.
211 mlt_position mlt_producer_get_out( mlt_producer this )
213 return mlt_properties_get_position( mlt_producer_properties( this ), "out" );
216 /** Get the total play time.
219 mlt_position mlt_producer_get_playtime( mlt_producer this )
221 return mlt_producer_get_out( this ) - mlt_producer_get_in( this ) + 1;
224 /** Get the total length of the producer.
227 mlt_position mlt_producer_get_length( mlt_producer this )
229 return mlt_properties_get_position( mlt_producer_properties( this ), "length" );
232 /** Prepare for next frame.
235 void mlt_producer_prepare_next( mlt_producer this )
237 mlt_producer_seek( this, mlt_producer_position( this ) + mlt_producer_get_speed( this ) );
243 static int producer_get_frame( mlt_service service, mlt_frame_ptr frame, int index )
246 mlt_producer this = service->child;
248 // Determine eof handling
249 char *eof = mlt_properties_get( mlt_producer_properties( this ), "eof" );
251 // A properly instatiated producer will have a get_frame method...
252 //fprintf( stderr, "PRODUCER get_frame %p eof %s pos %lld out %lld\n",
253 //this->get_frame, eof, mlt_producer_position( this ), mlt_producer_get_out( this ) );
254 if ( this->get_frame == NULL || ( !strcmp( eof, "continue" ) && mlt_producer_position( this ) > mlt_producer_get_out( this ) ) )
256 // Generate a test frame
257 *frame = mlt_frame_init( );
260 result = mlt_frame_set_position( *frame, mlt_producer_position( this ) );
262 // Calculate the next position
263 mlt_producer_prepare_next( this );
267 // Get the frame from the implementation
268 result = this->get_frame( this, frame, index );
271 // Copy the fps and speed of the producer onto the frame
272 mlt_properties properties = mlt_frame_properties( *frame );
273 mlt_properties_set_double( properties, "fps", mlt_producer_get_fps( this ) );
274 double speed = mlt_producer_get_speed( this );
275 mlt_properties_set_double( properties, "_speed", speed );
280 /** Close the producer.
283 void mlt_producer_close( mlt_producer this )
285 if ( this->close != NULL )
288 mlt_service_close( &this->parent );