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" ) )
70 mlt_properties_set_double( properties, "fps", 25.0 );
71 mlt_properties_set_double( properties, "aspect_ratio", 72.0 / 79.0 );
75 mlt_properties_set_double( properties, "fps", 30000.0 / 1001.0 );
76 mlt_properties_set_double( properties, "aspect_ratio", 128.0 / 117.0 );
78 mlt_properties_set_double( properties, "_speed", 1.0 );
79 mlt_properties_set_position( properties, "in", 0 );
80 mlt_properties_set_position( properties, "out", 14999 );
81 mlt_properties_set_position( properties, "length", 15000 );
82 mlt_properties_set( properties, "eof", "pause" );
83 mlt_properties_set( properties, "resource", "<producer>" );
85 // Override service get_frame
86 parent->get_frame = producer_get_frame;
93 /** Create a new producer.
96 mlt_producer mlt_producer_new( )
98 mlt_producer this = malloc( sizeof( struct mlt_producer_s ) );
99 mlt_producer_init( this, NULL );
103 /** Get the parent service object.
106 mlt_service mlt_producer_service( mlt_producer this )
108 return &this->parent;
111 /** Get the producer properties.
114 mlt_properties mlt_producer_properties( mlt_producer this )
116 return mlt_service_properties( &this->parent );
119 /** Seek to a specified position.
122 int mlt_producer_seek( mlt_producer this, mlt_position position )
124 // Determine eof handling
125 char *eof = mlt_properties_get( mlt_producer_properties( this ), "eof" );
132 else if ( !strcmp( eof, "pause" ) && position >= mlt_producer_get_playtime( this ) )
134 mlt_producer_set_speed( this, 0 );
135 position = mlt_producer_get_playtime( this ) - 1;
137 else if ( !strcmp( eof, "loop" ) && position >= mlt_producer_get_playtime( this ) )
139 position = position % mlt_producer_get_playtime( this );
143 mlt_properties_set_position( mlt_producer_properties( this ), "_position", position );
145 // Calculate the absolute frame
146 mlt_properties_set_position( mlt_producer_properties( this ), "_frame", mlt_producer_get_in( this ) + position );
151 /** Get the current position (relative to in point).
154 mlt_position mlt_producer_position( mlt_producer this )
156 return mlt_properties_get_position( mlt_producer_properties( this ), "_position" );
159 /** Get the current position (relative to start of producer).
162 mlt_position mlt_producer_frame( mlt_producer this )
164 return mlt_properties_get_position( mlt_producer_properties( this ), "_frame" );
167 /** Set the playing speed.
170 int mlt_producer_set_speed( mlt_producer this, double speed )
172 return mlt_properties_set_double( mlt_producer_properties( this ), "_speed", speed );
175 /** Get the playing speed.
178 double mlt_producer_get_speed( mlt_producer this )
180 return mlt_properties_get_double( mlt_producer_properties( this ), "_speed" );
183 /** Get the frames per second.
186 double mlt_producer_get_fps( mlt_producer this )
188 return mlt_properties_get_double( mlt_producer_properties( this ), "fps" );
191 /** Set the in and out points.
194 int mlt_producer_set_in_and_out( mlt_producer this, mlt_position in, mlt_position out )
196 // Correct ins and outs if necessary
199 else if ( in > mlt_producer_get_length( this ) )
200 in = mlt_producer_get_length( this );
204 else if ( out > mlt_producer_get_length( this ) )
205 out = mlt_producer_get_length( this );
207 // Swap ins and outs if wrong
216 mlt_properties_set_position( mlt_producer_properties( this ), "in", in );
217 mlt_properties_set_position( mlt_producer_properties( this ), "out", out );
222 /** Get the in point.
225 mlt_position mlt_producer_get_in( mlt_producer this )
227 return mlt_properties_get_position( mlt_producer_properties( this ), "in" );
230 /** Get the out point.
233 mlt_position mlt_producer_get_out( mlt_producer this )
235 return mlt_properties_get_position( mlt_producer_properties( this ), "out" );
238 /** Get the total play time.
241 mlt_position mlt_producer_get_playtime( mlt_producer this )
243 return mlt_producer_get_out( this ) - mlt_producer_get_in( this ) + 1;
246 /** Get the total length of the producer.
249 mlt_position mlt_producer_get_length( mlt_producer this )
251 return mlt_properties_get_position( mlt_producer_properties( this ), "length" );
254 /** Prepare for next frame.
257 void mlt_producer_prepare_next( mlt_producer this )
259 mlt_producer_seek( this, mlt_producer_position( this ) + mlt_producer_get_speed( this ) );
265 static int producer_get_frame( mlt_service service, mlt_frame_ptr frame, int index )
268 mlt_producer this = service->child;
270 // Determine eof handling
271 char *eof = mlt_properties_get( mlt_producer_properties( this ), "eof" );
273 // A properly instatiated producer will have a get_frame method...
274 if ( this->get_frame == NULL || ( !strcmp( eof, "continue" ) && mlt_producer_position( this ) > mlt_producer_get_out( this ) ) )
276 // Generate a test frame
277 *frame = mlt_frame_init( );
280 result = mlt_frame_set_position( *frame, mlt_producer_position( this ) );
282 // Mark as a test card
283 mlt_properties_set_int( mlt_frame_properties( *frame ), "test_image", 1 );
284 mlt_properties_set_int( mlt_frame_properties( *frame ), "test_audio", 1 );
286 // Calculate the next position
287 mlt_producer_prepare_next( this );
291 // Get the frame from the implementation
292 result = this->get_frame( this, frame, index );
295 // Copy the fps and speed of the producer onto the frame
296 mlt_properties properties = mlt_frame_properties( *frame );
297 mlt_properties_set_double( properties, "fps", mlt_producer_get_fps( this ) );
298 double speed = mlt_producer_get_speed( this );
299 mlt_properties_set_double( properties, "_speed", speed );
304 /** Close the producer.
307 void mlt_producer_close( mlt_producer this )
309 if ( this->close != NULL )
312 mlt_service_close( &this->parent );