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 frame_properties
= mlt_frame_properties( frame
);
215 mlt_properties_set_int( frame_properties
, "width", mlt_properties_get_int( properties
, "width" ) );
216 mlt_properties_set_int( frame_properties
, "height", mlt_properties_get_int( properties
, "height" ) );
217 mlt_properties_set( frame_properties
, "rescale.interp", mlt_properties_get( properties
, "rescale.interp" ) );
218 mlt_properties_set_double( frame_properties
, "aspect_ratio", mlt_properties_get_double( properties
, "aspect_ratio" ) );
219 mlt_properties_set_double( frame_properties
, "consumer_aspect_ratio", mlt_properties_get_double( properties
, "consumer_aspect_ratio" ) );
220 mlt_properties_set_int( frame_properties
, "consumer_progressive", mlt_properties_get_double( properties
, "consumer_progressive" ) );
221 mlt_properties_set_int( frame_properties
, "consumer_deinterlace", mlt_properties_get_double( properties
, "consumer_deinterlace" ) );
222 mlt_frame_get_image( frame
, buffer
, format
, width
, height
, writable
);
223 mlt_properties_set_data( properties
, "image", *buffer
, *width
* *height
* 2, NULL
, NULL
);
224 mlt_properties_set_int( properties
, "width", *width
);
225 mlt_properties_set_int( properties
, "height", *height
);
226 mlt_properties_set_double( properties
, "aspect_ratio", mlt_frame_get_aspect_ratio( frame
) );
227 data
= mlt_frame_get_alpha_mask( frame
);
228 mlt_properties_set_data( properties
, "alpha", data
, 0, NULL
, NULL
);
229 this->get_alpha_mask
= mlt_tractor_alpha_mask
;
233 static int producer_get_audio( mlt_frame
this, int16_t **buffer
, mlt_audio_format
*format
, int *frequency
, int *channels
, int *samples
)
235 mlt_properties properties
= mlt_frame_properties( this );
236 mlt_frame frame
= mlt_frame_pop_audio( this );
237 mlt_frame_get_audio( frame
, buffer
, format
, frequency
, channels
, samples
);
238 mlt_properties_set_data( properties
, "audio", *buffer
, 0, NULL
, NULL
);
239 mlt_properties_set_int( properties
, "frequency", *frequency
);
240 mlt_properties_set_int( properties
, "channels", *channels
);
244 /** Get the next frame.
247 static int producer_get_frame( mlt_producer parent
, mlt_frame_ptr frame
, int track
)
249 mlt_tractor
this = parent
->child
;
251 // We only respond to the first track requests
252 if ( track
== 0 && this->producer
!= NULL
)
256 mlt_frame temp
= NULL
;
259 // Get the properties of the parent producer
260 mlt_properties properties
= mlt_producer_properties( parent
);
262 // Try to obtain the multitrack associated to the tractor
263 mlt_multitrack multitrack
= mlt_properties_get_data( properties
, "multitrack", NULL
);
265 // Or a specific producer
266 mlt_producer producer
= mlt_properties_get_data( properties
, "producer", NULL
);
268 // If we don't have one, we're in trouble...
269 if ( multitrack
!= NULL
)
271 // Used to garbage collect all frames
274 // Get the id of the tractor
275 char *id
= mlt_properties_get( properties
, "_unique_id" );
277 // Will be used to store the frame properties object
278 mlt_properties frame_properties
= NULL
;
280 // We'll store audio and video frames to use here
281 mlt_frame audio
= NULL
;
282 mlt_frame video
= NULL
;
284 // Determine which data_queue to pass on...
285 void *data_queue
= NULL
;
287 // Temporary properties
288 mlt_properties temp_properties
= NULL
;
290 // Get the multitrack's producer
291 mlt_producer target
= mlt_multitrack_producer( multitrack
);
292 mlt_producer_seek( target
, mlt_producer_frame( parent
) );
293 mlt_producer_set_speed( target
, mlt_producer_get_speed( parent
) );
295 // We will create one frame and attach everything to it
296 *frame
= mlt_frame_init( );
298 // Get the properties of the frame
299 frame_properties
= mlt_frame_properties( *frame
);
301 // Loop through each of the tracks we're harvesting
302 for ( i
= 0; !done
; i
++ )
304 // Get a frame from the producer
305 mlt_service_get_frame( this->producer
, &temp
, i
);
307 // Get the temporary properties
308 temp_properties
= mlt_frame_properties( temp
);
310 // Check for last track
311 done
= mlt_properties_get_int( temp_properties
, "last_track" );
313 // We store all frames with a destructor on the output frame
314 sprintf( label
, "_%s_%d", id
, count
++ );
315 mlt_properties_set_data( frame_properties
, label
, temp
, 0, ( mlt_destructor
)mlt_frame_close
, NULL
);
317 // We want the last data_queue
318 if ( !done
&& mlt_properties_get_data( temp_properties
, "data_queue", NULL
) != NULL
)
319 data_queue
= mlt_properties_get_data( mlt_frame_properties( temp
), "data_queue", NULL
);
321 // Pick up first video and audio frames
322 if ( !done
&& !mlt_frame_is_test_audio( temp
) && !( mlt_properties_get_int( temp_properties
, "hide" ) & 2 ) )
324 if ( !done
&& !mlt_frame_is_test_card( temp
) && !( mlt_properties_get_int( temp_properties
, "hide" ) & 1 ) )
328 // Now stack callbacks
331 mlt_frame_push_audio( *frame
, audio
);
332 ( *frame
)->get_audio
= producer_get_audio
;
337 mlt_properties video_properties
= mlt_frame_properties( video
);
338 mlt_frame_push_service( *frame
, video
);
339 mlt_frame_push_service( *frame
, producer_get_image
);
340 mlt_properties_set_data( frame_properties
, "data_queue", data_queue
, 0, NULL
, NULL
);
341 mlt_properties_set_int( frame_properties
, "width", mlt_properties_get_int( video_properties
, "width" ) );
342 mlt_properties_set_int( frame_properties
, "height", mlt_properties_get_int( video_properties
, "height" ) );
343 mlt_properties_set_double( frame_properties
, "aspect_ratio", mlt_properties_get_double( video_properties
, "aspect_ratio" ) );
346 mlt_frame_set_position( *frame
, mlt_producer_frame( parent
) );
347 mlt_properties_set_int( mlt_frame_properties( *frame
), "test_audio", audio
== NULL
);
348 mlt_properties_set_int( mlt_frame_properties( *frame
), "test_image", video
== NULL
);
350 else if ( producer
!= NULL
)
352 mlt_producer_seek( producer
, mlt_producer_frame( parent
) );
353 mlt_producer_set_speed( producer
, mlt_producer_get_speed( parent
) );
354 mlt_service_get_frame( this->producer
, frame
, track
);
358 fprintf( stderr
, "tractor without a multitrack!!\n" );
359 mlt_service_get_frame( this->producer
, frame
, track
);
362 // Prepare the next frame
363 mlt_producer_prepare_next( parent
);
365 // Indicate our found status
370 // Generate a test card
371 *frame
= mlt_frame_init( );
376 /** Close the tractor.
379 void mlt_tractor_close( mlt_tractor
this )
381 if ( this != NULL
&& mlt_properties_dec_ref( mlt_tractor_properties( this ) ) <= 0 )
383 this->parent
.close
= NULL
;
384 mlt_producer_close( &this->parent
);