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_factory.h"
24 #include "mlt_frame.h"
30 /** Forward references.
33 static int producer_get_frame( mlt_service this, mlt_frame_ptr frame, int index );
38 int mlt_producer_init( mlt_producer this, void *child )
40 // Check that we haven't received NULL
41 int error = this == NULL;
43 // Continue if no error
46 // Initialise the producer
47 memset( this, 0, sizeof( struct mlt_producer_s ) );
49 // Associate with the child
52 // Initialise the service
53 if ( mlt_service_init( &this->parent, this ) == 0 )
55 // Get the normalisation preference
56 char *normalisation = mlt_environment( "MLT_NORMALISATION" );
58 // The parent is the service
59 mlt_service parent = &this->parent;
61 // Get the properties of the parent
62 mlt_properties properties = mlt_service_properties( parent );
64 // Set the default properties
65 mlt_properties_set( properties, "mlt_type", "mlt_producer" );
66 mlt_properties_set_position( properties, "_position", 0.0 );
67 mlt_properties_set_double( properties, "_frame", 0 );
68 if ( normalisation == NULL || strcmp( normalisation, "NTSC" ) )
69 mlt_properties_set_double( properties, "fps", 25.0 );
71 mlt_properties_set_double( properties, "fps", 30000.0 / 1001.0 );
72 mlt_properties_set_double( properties, "_speed", 1.0 );
73 mlt_properties_set_position( properties, "in", 0 );
74 mlt_properties_set_position( properties, "out", 14999 );
75 mlt_properties_set_position( properties, "length", 15000 );
76 mlt_properties_set_double( properties, "aspect_ratio", 128.0 / 117.0 );
77 mlt_properties_set( properties, "eof", "pause" );
78 mlt_properties_set( properties, "resource", "<producer>" );
80 // Override service get_frame
81 parent->get_frame = producer_get_frame;
88 /** Get the parent service object.
91 mlt_service mlt_producer_service( mlt_producer this )
96 /** Get the producer properties.
99 mlt_properties mlt_producer_properties( mlt_producer this )
101 return mlt_service_properties( &this->parent );
104 /** Seek to a specified position.
107 int mlt_producer_seek( mlt_producer this, mlt_position position )
109 // Determine eof handling
110 char *eof = mlt_properties_get( mlt_producer_properties( this ), "eof" );
117 else if ( !strcmp( eof, "pause" ) && position >= mlt_producer_get_playtime( this ) )
119 mlt_producer_set_speed( this, 0 );
120 position = mlt_producer_get_playtime( this ) - 1;
122 else if ( !strcmp( eof, "loop" ) && position >= mlt_producer_get_playtime( this ) )
124 position = position % mlt_producer_get_playtime( this );
128 mlt_properties_set_position( mlt_producer_properties( this ), "_position", position );
130 // Calculate the absolute frame
131 mlt_properties_set_position( mlt_producer_properties( this ), "_frame", mlt_producer_get_in( this ) + position );
136 /** Get the current position (relative to in point).
139 mlt_position mlt_producer_position( mlt_producer this )
141 return mlt_properties_get_position( mlt_producer_properties( this ), "_position" );
144 /** Get the current position (relative to start of producer).
147 mlt_position mlt_producer_frame( mlt_producer this )
149 return mlt_properties_get_position( mlt_producer_properties( this ), "_frame" );
152 /** Set the playing speed.
155 int mlt_producer_set_speed( mlt_producer this, double speed )
157 return mlt_properties_set_double( mlt_producer_properties( this ), "_speed", speed );
160 /** Get the playing speed.
163 double mlt_producer_get_speed( mlt_producer this )
165 return mlt_properties_get_double( mlt_producer_properties( this ), "_speed" );
168 /** Get the frames per second.
171 double mlt_producer_get_fps( mlt_producer this )
173 return mlt_properties_get_double( mlt_producer_properties( this ), "fps" );
176 /** Set the in and out points.
179 int mlt_producer_set_in_and_out( mlt_producer this, mlt_position in, mlt_position out )
181 // Correct ins and outs if necessary
184 else if ( in > mlt_producer_get_length( this ) )
185 in = mlt_producer_get_length( this );
189 else if ( out > mlt_producer_get_length( this ) )
190 out = mlt_producer_get_length( this );
192 // Swap ins and outs if wrong
201 mlt_properties_set_position( mlt_producer_properties( this ), "in", in );
202 mlt_properties_set_position( mlt_producer_properties( this ), "out", out );
207 /** Get the in point.
210 mlt_position mlt_producer_get_in( mlt_producer this )
212 return mlt_properties_get_position( mlt_producer_properties( this ), "in" );
215 /** Get the out point.
218 mlt_position mlt_producer_get_out( mlt_producer this )
220 return mlt_properties_get_position( mlt_producer_properties( this ), "out" );
223 /** Get the total play time.
226 mlt_position mlt_producer_get_playtime( mlt_producer this )
228 return mlt_producer_get_out( this ) - mlt_producer_get_in( this ) + 1;
231 /** Get the total length of the producer.
234 mlt_position mlt_producer_get_length( mlt_producer this )
236 return mlt_properties_get_position( mlt_producer_properties( this ), "length" );
239 /** Prepare for next frame.
242 void mlt_producer_prepare_next( mlt_producer this )
244 mlt_producer_seek( this, mlt_producer_position( this ) + mlt_producer_get_speed( this ) );
250 static int producer_get_frame( mlt_service service, mlt_frame_ptr frame, int index )
253 mlt_producer this = service->child;
255 // Determine eof handling
256 char *eof = mlt_properties_get( mlt_producer_properties( this ), "eof" );
258 // A properly instatiated producer will have a get_frame method...
259 if ( this->get_frame == NULL || ( !strcmp( eof, "continue" ) && mlt_producer_position( this ) > mlt_producer_get_out( this ) ) )
261 // Generate a test frame
262 *frame = mlt_frame_init( );
265 result = mlt_frame_set_position( *frame, mlt_producer_position( this ) );
267 // Mark as a test card
268 mlt_properties_set_int( mlt_frame_properties( *frame ), "test_image", 1 );
269 mlt_properties_set_int( mlt_frame_properties( *frame ), "test_audio", 1 );
271 // Calculate the next position
272 mlt_producer_prepare_next( this );
276 // Get the frame from the implementation
277 result = this->get_frame( this, frame, index );
280 // Copy the fps and speed of the producer onto the frame
281 mlt_properties properties = mlt_frame_properties( *frame );
282 mlt_properties_set_double( properties, "fps", mlt_producer_get_fps( this ) );
283 double speed = mlt_producer_get_speed( this );
284 mlt_properties_set_double( properties, "_speed", speed );
289 /** Close the producer.
292 void mlt_producer_close( mlt_producer this )
294 if ( this->close != NULL )
297 mlt_service_close( &this->parent );