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 /** Forward references to static methods.
35 static int producer_get_frame( mlt_producer
this, mlt_frame_ptr frame
, int track
);
36 static void mlt_tractor_listener( mlt_multitrack tracks
, mlt_tractor
this );
38 /** Constructor for the tractor.
41 mlt_tractor
mlt_tractor_init( )
43 mlt_tractor
this = calloc( sizeof( struct mlt_tractor_s
), 1 );
46 mlt_producer producer
= &this->parent
;
47 if ( mlt_producer_init( producer
, this ) == 0 )
49 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( producer
);
51 mlt_properties_set( properties
, "resource", "<tractor>" );
52 mlt_properties_set( properties
, "mlt_type", "mlt_producer" );
53 mlt_properties_set( properties
, "mlt_service", "tractor" );
54 mlt_properties_set_int( properties
, "in", 0 );
55 mlt_properties_set_int( properties
, "out", -1 );
56 mlt_properties_set_int( properties
, "length", 0 );
58 producer
->get_frame
= producer_get_frame
;
59 producer
->close
= ( mlt_destructor
)mlt_tractor_close
;
60 producer
->close_object
= this;
71 mlt_tractor
mlt_tractor_new( )
73 mlt_tractor
this = calloc( sizeof( struct mlt_tractor_s
), 1 );
76 mlt_producer producer
= &this->parent
;
77 if ( mlt_producer_init( producer
, this ) == 0 )
79 mlt_multitrack multitrack
= mlt_multitrack_init( );
80 mlt_field field
= mlt_field_new( multitrack
, this );
81 mlt_properties props
= MLT_PRODUCER_PROPERTIES( producer
);
83 mlt_properties_set( props
, "resource", "<tractor>" );
84 mlt_properties_set( props
, "mlt_type", "mlt_producer" );
85 mlt_properties_set( props
, "mlt_service", "tractor" );
86 mlt_properties_set_position( props
, "in", 0 );
87 mlt_properties_set_position( props
, "out", 0 );
88 mlt_properties_set_position( props
, "length", 0 );
89 mlt_properties_set_data( props
, "multitrack", multitrack
, 0, ( mlt_destructor
)mlt_multitrack_close
, NULL
);
90 mlt_properties_set_data( props
, "field", field
, 0, ( mlt_destructor
)mlt_field_close
, NULL
);
92 mlt_events_listen( MLT_MULTITRACK_PROPERTIES( multitrack
), this, "producer-changed", ( mlt_listener
)mlt_tractor_listener
);
94 producer
->get_frame
= producer_get_frame
;
95 producer
->close
= ( mlt_destructor
)mlt_tractor_close
;
96 producer
->close_object
= this;
107 /** Get the service object associated to the tractor.
110 mlt_service
mlt_tractor_service( mlt_tractor
this )
112 return MLT_PRODUCER_SERVICE( &this->parent
);
115 /** Get the producer object associated to the tractor.
118 mlt_producer
mlt_tractor_producer( mlt_tractor
this )
120 return this != NULL ?
&this->parent
: NULL
;
123 /** Get the properties object associated to the tractor.
126 mlt_properties
mlt_tractor_properties( mlt_tractor
this )
128 return MLT_PRODUCER_PROPERTIES( &this->parent
);
131 /** Get the field this tractor is harvesting.
134 mlt_field
mlt_tractor_field( mlt_tractor
this )
136 return mlt_properties_get_data( MLT_TRACTOR_PROPERTIES( this ), "field", NULL
);
139 /** Get the multitrack this tractor is pulling.
142 mlt_multitrack
mlt_tractor_multitrack( mlt_tractor
this )
144 return mlt_properties_get_data( MLT_TRACTOR_PROPERTIES( this ), "multitrack", NULL
);
147 /** Ensure the tractors in/out points match the multitrack.
150 void mlt_tractor_refresh( mlt_tractor
this )
152 mlt_multitrack multitrack
= mlt_tractor_multitrack( this );
153 mlt_properties properties
= MLT_MULTITRACK_PROPERTIES( multitrack
);
154 mlt_properties self
= MLT_TRACTOR_PROPERTIES( this );
155 mlt_events_block( properties
, self
);
156 mlt_events_block( self
, self
);
157 mlt_multitrack_refresh( multitrack
);
158 mlt_properties_set_position( self
, "in", 0 );
159 mlt_properties_set_position( self
, "out", mlt_properties_get_position( properties
, "out" ) );
160 mlt_events_unblock( self
, self
);
161 mlt_events_unblock( properties
, self
);
162 mlt_properties_set_position( self
, "length", mlt_properties_get_position( properties
, "length" ) );
165 static void mlt_tractor_listener( mlt_multitrack tracks
, mlt_tractor
this )
167 mlt_tractor_refresh( this );
170 /** Connect the tractor.
173 int mlt_tractor_connect( mlt_tractor
this, mlt_service producer
)
175 int ret
= mlt_service_connect_producer( MLT_TRACTOR_SERVICE( this ), producer
, 0 );
177 // This is the producer we're going to connect to
179 this->producer
= producer
;
184 /** Set the producer for a specific track.
187 int mlt_tractor_set_track( mlt_tractor
this, mlt_producer producer
, int index
)
189 return mlt_multitrack_connect( mlt_tractor_multitrack( this ), producer
, index
);
192 /** Get the producer for a specific track.
195 mlt_producer
mlt_tractor_get_track( mlt_tractor
this, int index
)
197 return mlt_multitrack_track( mlt_tractor_multitrack( this ), index
);
200 static int producer_get_image( mlt_frame
this, uint8_t **buffer
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
202 uint8_t *data
= NULL
;
203 mlt_properties properties
= MLT_FRAME_PROPERTIES( this );
204 mlt_frame frame
= mlt_frame_pop_service( this );
205 mlt_properties frame_properties
= MLT_FRAME_PROPERTIES( frame
);
206 mlt_properties_set_int( frame_properties
, "width", mlt_properties_get_int( properties
, "width" ) );
207 mlt_properties_set_int( frame_properties
, "height", mlt_properties_get_int( properties
, "height" ) );
208 mlt_properties_set( frame_properties
, "rescale.interp", mlt_properties_get( properties
, "rescale.interp" ) );
209 mlt_properties_set_int( frame_properties
, "distort", mlt_properties_get_int( properties
, "distort" ) );
210 mlt_properties_set_double( frame_properties
, "consumer_aspect_ratio", mlt_properties_get_double( properties
, "consumer_aspect_ratio" ) );
211 mlt_properties_set_int( frame_properties
, "consumer_deinterlace", mlt_properties_get_double( properties
, "consumer_deinterlace" ) );
212 mlt_properties_set_int( frame_properties
, "normalised_width", mlt_properties_get_double( properties
, "normalised_width" ) );
213 mlt_properties_set_int( frame_properties
, "normalised_height", mlt_properties_get_double( properties
, "normalised_height" ) );
214 mlt_frame_get_image( frame
, buffer
, format
, width
, height
, writable
);
215 mlt_properties_set_data( properties
, "image", *buffer
, *width
* *height
* 2, NULL
, NULL
);
216 mlt_properties_set_int( properties
, "width", *width
);
217 mlt_properties_set_int( properties
, "height", *height
);
218 mlt_properties_set_double( properties
, "aspect_ratio", mlt_frame_get_aspect_ratio( frame
) );
219 mlt_properties_set_int( properties
, "progressive", mlt_properties_get_int( frame_properties
, "progressive" ) );
220 mlt_properties_set_int( properties
, "distort", mlt_properties_get_int( frame_properties
, "distort" ) );
221 data
= mlt_frame_get_alpha_mask( frame
);
222 mlt_properties_set_data( properties
, "alpha", data
, 0, NULL
, NULL
);
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_frame_get_audio( frame
, buffer
, format
, frequency
, channels
, samples
);
231 mlt_properties_set_data( properties
, "audio", *buffer
, 0, NULL
, NULL
);
232 mlt_properties_set_int( properties
, "frequency", *frequency
);
233 mlt_properties_set_int( properties
, "channels", *channels
);
237 static void destroy_data_queue( void *arg
)
241 // Assign the correct type
242 mlt_deque queue
= arg
;
244 // Iterate through each item and destroy them
245 while ( mlt_deque_peek_front( queue
) != NULL
)
246 mlt_properties_close( mlt_deque_pop_back( queue
) );
249 mlt_deque_close( queue
);
253 /** Get the next frame.
256 static int producer_get_frame( mlt_producer parent
, mlt_frame_ptr frame
, int track
)
258 mlt_tractor
this = parent
->child
;
260 // We only respond to the first track requests
261 if ( track
== 0 && this->producer
!= NULL
)
265 mlt_frame temp
= NULL
;
268 // Get the properties of the parent producer
269 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( parent
);
271 // Try to obtain the multitrack associated to the tractor
272 mlt_multitrack multitrack
= mlt_properties_get_data( properties
, "multitrack", NULL
);
274 // Or a specific producer
275 mlt_producer producer
= mlt_properties_get_data( properties
, "producer", NULL
);
277 // The output frame will hold the 'global' data feeds (ie: those which are targetted for the final frame)
278 mlt_deque data_queue
= mlt_deque_init( );
280 // Determine whether this tractor feeds to the consumer or stops here
281 int global_feed
= mlt_properties_get_int( properties
, "global_feed" );
283 // If we don't have one, we're in trouble...
284 if ( multitrack
!= NULL
)
286 // Used to garbage collect all frames
289 // Get the id of the tractor
290 char *id
= mlt_properties_get( properties
, "_unique_id" );
292 // Will be used to store the frame properties object
293 mlt_properties frame_properties
= NULL
;
295 // We'll store audio and video frames to use here
296 mlt_frame audio
= NULL
;
297 mlt_frame video
= NULL
;
299 // Temporary properties
300 mlt_properties temp_properties
= NULL
;
302 // Get the multitrack's producer
303 mlt_producer target
= MLT_MULTITRACK_PRODUCER( multitrack
);
304 mlt_producer_seek( target
, mlt_producer_frame( parent
) );
305 mlt_producer_set_speed( target
, mlt_producer_get_speed( parent
) );
307 // We will create one frame and attach everything to it
308 *frame
= mlt_frame_init( );
310 // Get the properties of the frame
311 frame_properties
= MLT_FRAME_PROPERTIES( *frame
);
313 // Loop through each of the tracks we're harvesting
314 for ( i
= 0; !done
; i
++ )
316 // Get a frame from the producer
317 mlt_service_get_frame( this->producer
, &temp
, i
);
319 // Get the temporary properties
320 temp_properties
= MLT_FRAME_PROPERTIES( temp
);
322 // Check for last track
323 done
= mlt_properties_get_int( temp_properties
, "last_track" );
325 // We store all frames with a destructor on the output frame
326 sprintf( label
, "_%s_%d", id
, count
++ );
327 mlt_properties_set_data( frame_properties
, label
, temp
, 0, ( mlt_destructor
)mlt_frame_close
, NULL
);
329 // We want to append all 'final' feeds to the global queue
330 if ( !done
&& mlt_properties_get_data( temp_properties
, "data_queue", NULL
) != NULL
)
332 // Move the contents of this queue on to the output frames data queue
333 mlt_deque sub_queue
= mlt_properties_get_data( MLT_FRAME_PROPERTIES( temp
), "data_queue", NULL
);
334 mlt_deque temp
= mlt_deque_init( );
335 while ( global_feed
&& mlt_deque_count( sub_queue
) )
337 mlt_properties p
= mlt_deque_pop_back( sub_queue
);
338 if ( mlt_properties_get_int( p
, "final" ) )
339 mlt_deque_push_back( data_queue
, p
);
341 mlt_deque_push_back( temp
, p
);
343 while( mlt_deque_count( temp
) )
344 mlt_deque_push_front( sub_queue
, mlt_deque_pop_back( temp
) );
345 mlt_deque_close( temp
);
348 // Now do the same with the global queue but without the conditional behaviour
349 if ( mlt_properties_get_data( temp_properties
, "global_queue", NULL
) != NULL
)
351 mlt_deque sub_queue
= mlt_properties_get_data( MLT_FRAME_PROPERTIES( temp
), "global_queue", NULL
);
352 while ( mlt_deque_count( sub_queue
) )
354 mlt_properties p
= mlt_deque_pop_back( sub_queue
);
355 mlt_deque_push_back( data_queue
, p
);
359 // Pick up first video and audio frames
360 if ( !done
&& !mlt_frame_is_test_audio( temp
) && !( mlt_properties_get_int( temp_properties
, "hide" ) & 2 ) )
362 if ( !done
&& !mlt_frame_is_test_card( temp
) && !( mlt_properties_get_int( temp_properties
, "hide" ) & 1 ) )
366 // Now stack callbacks
369 mlt_frame_push_audio( *frame
, audio
);
370 mlt_frame_push_audio( *frame
, producer_get_audio
);
375 mlt_properties video_properties
= MLT_FRAME_PROPERTIES( video
);
376 mlt_frame_push_service( *frame
, video
);
377 mlt_frame_push_service( *frame
, producer_get_image
);
379 mlt_properties_set_data( frame_properties
, "data_queue", data_queue
, 0, NULL
, NULL
);
380 mlt_properties_set_data( video_properties
, "global_queue", data_queue
, 0, destroy_data_queue
, NULL
);
381 mlt_properties_set_int( frame_properties
, "width", mlt_properties_get_int( video_properties
, "width" ) );
382 mlt_properties_set_int( frame_properties
, "height", mlt_properties_get_int( video_properties
, "height" ) );
383 mlt_properties_set_int( frame_properties
, "real_width", mlt_properties_get_int( video_properties
, "real_width" ) );
384 mlt_properties_set_int( frame_properties
, "real_height", mlt_properties_get_int( video_properties
, "real_height" ) );
385 mlt_properties_set_int( frame_properties
, "progressive", mlt_properties_get_int( video_properties
, "progressive" ) );
386 mlt_properties_set_double( frame_properties
, "aspect_ratio", mlt_properties_get_double( video_properties
, "aspect_ratio" ) );
390 destroy_data_queue( data_queue
);
393 mlt_frame_set_position( *frame
, mlt_producer_frame( parent
) );
394 mlt_properties_set_int( MLT_FRAME_PROPERTIES( *frame
), "test_audio", audio
== NULL
);
395 mlt_properties_set_int( MLT_FRAME_PROPERTIES( *frame
), "test_image", video
== NULL
);
396 mlt_properties_set_data( MLT_FRAME_PROPERTIES( *frame
), "consumer_lock_service", this, 0, NULL
, NULL
);
398 else if ( producer
!= NULL
)
400 mlt_producer_seek( producer
, mlt_producer_frame( parent
) );
401 mlt_producer_set_speed( producer
, mlt_producer_get_speed( parent
) );
402 mlt_service_get_frame( this->producer
, frame
, track
);
406 fprintf( stderr
, "tractor without a multitrack!!\n" );
407 mlt_service_get_frame( this->producer
, frame
, track
);
410 // Prepare the next frame
411 mlt_producer_prepare_next( parent
);
413 // Indicate our found status
418 // Generate a test card
419 *frame
= mlt_frame_init( );
424 /** Close the tractor.
427 void mlt_tractor_close( mlt_tractor
this )
429 if ( this != NULL
&& mlt_properties_dec_ref( MLT_TRACTOR_PROPERTIES( this ) ) <= 0 )
431 this->parent
.close
= NULL
;
432 mlt_producer_close( &this->parent
);