2 * mlt_tractor.c -- tractor service class
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.
23 #include "mlt_tractor.h"
24 #include "mlt_frame.h"
25 #include "mlt_multitrack.h"
26 #include "mlt_field.h"
32 /** Private structure.
37 struct mlt_producer_s parent
;
41 /** Forward references to static methods.
44 static int producer_get_frame( mlt_producer
this, mlt_frame_ptr frame
, int track
);
45 static void mlt_tractor_listener( mlt_multitrack tracks
, mlt_tractor
this );
47 /** Constructor for the tractor.
50 mlt_tractor
mlt_tractor_init( )
52 mlt_tractor
this = calloc( sizeof( struct mlt_tractor_s
), 1 );
55 mlt_producer producer
= &this->parent
;
56 if ( mlt_producer_init( producer
, this ) == 0 )
58 mlt_properties_set( mlt_producer_properties( producer
), "resource", "<tractor>" );
59 mlt_properties_set( mlt_producer_properties( producer
), "mlt_type", "mlt_producer" );
60 mlt_properties_set( mlt_producer_properties( producer
), "mlt_service", "tractor" );
62 producer
->get_frame
= producer_get_frame
;
63 producer
->close
= ( mlt_destructor
)mlt_tractor_close
;
64 producer
->close_object
= this;
75 mlt_tractor
mlt_tractor_new( )
77 mlt_tractor
this = calloc( sizeof( struct mlt_tractor_s
), 1 );
80 mlt_producer producer
= &this->parent
;
81 if ( mlt_producer_init( producer
, this ) == 0 )
83 mlt_multitrack multitrack
= mlt_multitrack_init( );
84 mlt_field field
= mlt_field_new( multitrack
, this );
85 mlt_properties props
= mlt_producer_properties( producer
);
87 mlt_properties_set( props
, "resource", "<tractor>" );
88 mlt_properties_set( props
, "mlt_type", "mlt_producer" );
89 mlt_properties_set( props
, "mlt_service", "tractor" );
90 mlt_properties_set_position( props
, "in", 0 );
91 mlt_properties_set_position( props
, "out", 0 );
92 mlt_properties_set_position( props
, "length", 0 );
93 mlt_properties_set_data( props
, "multitrack", multitrack
, 0, ( mlt_destructor
)mlt_multitrack_close
, NULL
);
94 mlt_properties_set_data( props
, "field", field
, 0, ( mlt_destructor
)mlt_field_close
, NULL
);
96 mlt_events_listen( mlt_multitrack_properties( multitrack
), this, "producer-changed", ( mlt_listener
)mlt_tractor_listener
);
98 producer
->get_frame
= producer_get_frame
;
99 producer
->close
= ( mlt_destructor
)mlt_tractor_close
;
100 producer
->close_object
= this;
111 /** Get the service object associated to the tractor.
114 mlt_service
mlt_tractor_service( mlt_tractor
this )
116 return mlt_producer_service( &this->parent
);
119 /** Get the producer object associated to the tractor.
122 mlt_producer
mlt_tractor_producer( mlt_tractor
this )
124 return this != NULL ?
&this->parent
: NULL
;
127 /** Get the properties object associated to the tractor.
130 mlt_properties
mlt_tractor_properties( mlt_tractor
this )
132 return mlt_producer_properties( &this->parent
);
135 /** Get the field this tractor is harvesting.
138 mlt_field
mlt_tractor_field( mlt_tractor
this )
140 return mlt_properties_get_data( mlt_tractor_properties( this ), "field", NULL
);
143 /** Get the multitrack this tractor is pulling.
146 mlt_multitrack
mlt_tractor_multitrack( mlt_tractor
this )
148 return mlt_properties_get_data( mlt_tractor_properties( this ), "multitrack", NULL
);
151 /** Ensure the tractors in/out points match the multitrack.
154 void mlt_tractor_refresh( mlt_tractor
this )
156 mlt_multitrack multitrack
= mlt_tractor_multitrack( this );
157 mlt_properties properties
= mlt_multitrack_properties( multitrack
);
158 mlt_properties self
= mlt_tractor_properties( this );
159 mlt_events_block( properties
, self
);
160 mlt_events_block( self
, self
);
161 mlt_multitrack_refresh( multitrack
);
162 mlt_properties_set_position( self
, "in", 0 );
163 mlt_properties_set_position( self
, "out", mlt_properties_get_position( properties
, "out" ) );
164 mlt_events_unblock( self
, self
);
165 mlt_events_unblock( properties
, self
);
166 mlt_properties_set_position( self
, "length", mlt_properties_get_position( properties
, "length" ) );
169 static void mlt_tractor_listener( mlt_multitrack tracks
, mlt_tractor
this )
171 mlt_tractor_refresh( this );
174 /** Connect the tractor.
177 int mlt_tractor_connect( mlt_tractor
this, mlt_service producer
)
179 int ret
= mlt_service_connect_producer( mlt_tractor_service( this ), producer
, 0 );
181 // This is the producer we're going to connect to
183 this->producer
= producer
;
188 /** Set the producer for a specific track.
191 int mlt_tractor_set_track( mlt_tractor
this, mlt_producer producer
, int index
)
193 return mlt_multitrack_connect( mlt_tractor_multitrack( this ), producer
, index
);
196 /** Get the producer for a specific track.
199 mlt_producer
mlt_tractor_get_track( mlt_tractor
this, int index
)
201 return mlt_multitrack_track( mlt_tractor_multitrack( this ), index
);
204 static uint8_t *mlt_tractor_alpha_mask( mlt_frame frame
)
206 return mlt_properties_get_data( mlt_frame_properties( frame
), "alpha", NULL
);
209 static int producer_get_image( mlt_frame
this, uint8_t **buffer
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
211 uint8_t *data
= NULL
;
212 mlt_properties properties
= mlt_frame_properties( this );
213 mlt_frame frame
= mlt_frame_pop_service( this );
214 mlt_properties_inherit( mlt_frame_properties( frame
), properties
);
215 mlt_frame_get_image( frame
, buffer
, format
, width
, height
, writable
);
216 mlt_properties_set_data( properties
, "image", *buffer
, *width
* *height
* 2, NULL
, NULL
);
217 mlt_properties_set_int( properties
, "width", *width
);
218 mlt_properties_set_int( properties
, "height", *height
);
219 mlt_properties_set_double( properties
, "aspect_ratio", mlt_frame_get_aspect_ratio( frame
) );
220 data
= mlt_frame_get_alpha_mask( frame
);
221 mlt_properties_set_data( properties
, "alpha", data
, 0, NULL
, NULL
);
222 this->get_alpha_mask
= mlt_tractor_alpha_mask
;
226 static int producer_get_audio( mlt_frame
this, int16_t **buffer
, mlt_audio_format
*format
, int *frequency
, int *channels
, int *samples
)
228 mlt_properties properties
= mlt_frame_properties( this );
229 mlt_frame frame
= mlt_frame_pop_audio( this );
230 mlt_properties_inherit( mlt_frame_properties( frame
), properties
);
231 mlt_frame_get_audio( frame
, buffer
, format
, frequency
, channels
, samples
);
232 mlt_properties_set_data( properties
, "audio", *buffer
, 0, NULL
, NULL
);
233 mlt_properties_set_int( properties
, "frequency", *frequency
);
234 mlt_properties_set_int( properties
, "channels", *channels
);
238 /** Get the next frame.
241 static int producer_get_frame( mlt_producer parent
, mlt_frame_ptr frame
, int track
)
243 mlt_tractor
this = parent
->child
;
245 // We only respond to the first track requests
246 if ( track
== 0 && this->producer
!= NULL
)
250 mlt_frame temp
= NULL
;
253 // Get the properties of the parent producer
254 mlt_properties properties
= mlt_producer_properties( parent
);
256 // Try to obtain the multitrack associated to the tractor
257 mlt_multitrack multitrack
= mlt_properties_get_data( properties
, "multitrack", NULL
);
259 // Or a specific producer
260 mlt_producer producer
= mlt_properties_get_data( properties
, "producer", NULL
);
262 // If we don't have one, we're in trouble...
263 if ( multitrack
!= NULL
)
265 // Used to garbage collect all frames
268 // Get the id of the tractor
269 char *id
= mlt_properties_get( properties
, "_unique_id" );
271 // Will be used to store the frame properties object
272 mlt_properties frame_properties
= NULL
;
274 // We'll store audio and video frames to use here
275 mlt_frame audio
= NULL
;
276 mlt_frame video
= NULL
;
278 // Determine which data_queue to pass on...
279 void *data_queue
= NULL
;
281 // Get the multitrack's producer
282 mlt_producer target
= mlt_multitrack_producer( multitrack
);
283 mlt_producer_seek( target
, mlt_producer_frame( parent
) );
284 mlt_producer_set_speed( target
, mlt_producer_get_speed( parent
) );
286 // We will create one frame and attach everything to it
287 *frame
= mlt_frame_init( );
289 // Get the properties of the frame
290 frame_properties
= mlt_frame_properties( *frame
);
292 // Loop through each of the tracks we're harvesting
293 for ( i
= 0; !done
; i
++ )
295 // Get a frame from the producer
296 mlt_service_get_frame( this->producer
, &temp
, i
);
298 // Check for last track
299 done
= mlt_properties_get_int( mlt_frame_properties( temp
), "last_track" );
301 // We store all frames with a destructor on the output frame
302 sprintf( label
, "_%s_%d", id
, count
++ );
303 mlt_properties_set_data( frame_properties
, label
, temp
, 0, ( mlt_destructor
)mlt_frame_close
, NULL
);
305 // We want the last data_queue
306 if ( mlt_properties_get_data( mlt_frame_properties( temp
), "data_queue", NULL
) != NULL
)
307 data_queue
= mlt_properties_get_data( mlt_frame_properties( temp
), "data_queue", NULL
);
309 // Pick up first video and audio frames
310 if ( !done
&& !mlt_frame_is_test_audio( temp
) && !( mlt_properties_get_int( mlt_frame_properties( temp
), "hide" ) & 2 ) )
312 if ( !done
&& !mlt_frame_is_test_card( temp
) && !( mlt_properties_get_int( mlt_frame_properties( temp
), "hide" ) & 1 ) )
316 // Now stack callbacks
319 mlt_frame_push_audio( *frame
, audio
);
320 ( *frame
)->get_audio
= producer_get_audio
;
321 mlt_properties_inherit( mlt_frame_properties( *frame
), mlt_frame_properties( audio
) );
326 mlt_properties_set_data( mlt_frame_properties( *frame
), "data_queue", data_queue
, 0, NULL
, NULL
);
327 mlt_frame_push_service( *frame
, video
);
328 mlt_frame_push_service( *frame
, producer_get_image
);
329 mlt_properties_inherit( mlt_frame_properties( *frame
), mlt_frame_properties( video
) );
332 mlt_properties_set_int( mlt_frame_properties( *frame
), "test_audio", audio
== NULL
);
333 mlt_properties_set_int( mlt_frame_properties( *frame
), "test_image", video
== NULL
);
335 else if ( producer
!= NULL
)
337 mlt_producer_seek( producer
, mlt_producer_frame( parent
) );
338 mlt_producer_set_speed( producer
, mlt_producer_get_speed( parent
) );
339 mlt_service_get_frame( this->producer
, frame
, track
);
343 fprintf( stderr
, "tractor without a multitrack!!\n" );
344 mlt_service_get_frame( this->producer
, frame
, track
);
347 // Prepare the next frame
348 mlt_producer_prepare_next( parent
);
350 // Indicate our found status
355 // Generate a test card
356 *frame
= mlt_frame_init( );
361 /** Close the tractor.
364 void mlt_tractor_close( mlt_tractor
this )
366 if ( this != NULL
&& mlt_properties_dec_ref( mlt_tractor_properties( this ) ) <= 0 )
368 this->parent
.close
= NULL
;
369 mlt_producer_close( &this->parent
);