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 if ( mlt_properties_get( properties, "distort" ) )
210 mlt_properties_set( frame_properties, "distort", mlt_properties_get( properties, "distort" ) );
211 mlt_properties_set_double( frame_properties, "consumer_aspect_ratio", mlt_properties_get_double( properties, "consumer_aspect_ratio" ) );
212 mlt_properties_set_int( frame_properties, "consumer_deinterlace", mlt_properties_get_double( properties, "consumer_deinterlace" ) );
213 mlt_properties_set_int( frame_properties, "normalised_width", mlt_properties_get_double( properties, "normalised_width" ) );
214 mlt_properties_set_int( frame_properties, "normalised_height", mlt_properties_get_double( properties, "normalised_height" ) );
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 mlt_properties_set_int( properties, "progressive", mlt_properties_get_int( frame_properties, "progressive" ) );
221 if ( mlt_properties_get( frame_properties, "distort" ) )
222 mlt_properties_set( properties, "distort", mlt_properties_get( frame_properties, "distort" ) );
223 data = mlt_frame_get_alpha_mask( frame );
224 mlt_properties_set_data( properties, "alpha", data, 0, NULL, NULL );
228 static int producer_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
230 mlt_properties properties = MLT_FRAME_PROPERTIES( this );
231 mlt_frame frame = mlt_frame_pop_audio( this );
232 mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
233 mlt_properties_set_data( properties, "audio", *buffer, 0, NULL, NULL );
234 mlt_properties_set_int( properties, "frequency", *frequency );
235 mlt_properties_set_int( properties, "channels", *channels );
239 /** Get the next frame.
242 static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int track )
244 mlt_tractor this = parent->child;
246 // We only respond to the first track requests
247 if ( track == 0 && this->producer != NULL )
251 mlt_frame temp = NULL;
254 // Get the properties of the parent producer
255 mlt_properties properties = MLT_PRODUCER_PROPERTIES( parent );
257 // Try to obtain the multitrack associated to the tractor
258 mlt_multitrack multitrack = mlt_properties_get_data( properties, "multitrack", NULL );
260 // Or a specific producer
261 mlt_producer producer = mlt_properties_get_data( properties, "producer", NULL );
263 // If we don't have one, we're in trouble...
264 if ( multitrack != NULL )
266 // Used to garbage collect all frames
269 // Get the id of the tractor
270 char *id = mlt_properties_get( properties, "_unique_id" );
272 // Will be used to store the frame properties object
273 mlt_properties frame_properties = NULL;
275 // We'll store audio and video frames to use here
276 mlt_frame audio = NULL;
277 mlt_frame video = NULL;
279 // Determine which data_queue to pass on...
280 void *data_queue = NULL;
282 // Temporary properties
283 mlt_properties temp_properties = NULL;
285 // Get the multitrack's producer
286 mlt_producer target = MLT_MULTITRACK_PRODUCER( multitrack );
287 mlt_producer_seek( target, mlt_producer_frame( parent ) );
288 mlt_producer_set_speed( target, mlt_producer_get_speed( parent ) );
290 // We will create one frame and attach everything to it
291 *frame = mlt_frame_init( );
293 // Get the properties of the frame
294 frame_properties = MLT_FRAME_PROPERTIES( *frame );
296 // Loop through each of the tracks we're harvesting
297 for ( i = 0; !done; i ++ )
299 // Get a frame from the producer
300 mlt_service_get_frame( this->producer, &temp, i );
302 // Get the temporary properties
303 temp_properties = MLT_FRAME_PROPERTIES( temp );
305 // Check for last track
306 done = mlt_properties_get_int( temp_properties, "last_track" );
308 // We store all frames with a destructor on the output frame
309 sprintf( label, "_%s_%d", id, count ++ );
310 mlt_properties_set_data( frame_properties, label, temp, 0, ( mlt_destructor )mlt_frame_close, NULL );
312 // We want the first data_queue, but after that, all queues are appended
313 if ( !done && mlt_properties_get_data( temp_properties, "data_queue", NULL ) != NULL &&
314 mlt_deque_count( mlt_properties_get_data( temp_properties, "data_queue", NULL ) ) != 0 )
316 if ( data_queue == NULL )
318 data_queue = mlt_properties_get_data( MLT_FRAME_PROPERTIES( temp ), "data_queue", NULL );
322 // Move the contents of this queue on to the output frames data queue
323 mlt_deque sub_queue = mlt_properties_get_data( MLT_FRAME_PROPERTIES( temp ), "data_queue", NULL );
324 while ( mlt_deque_count( sub_queue ) )
326 void *p = mlt_deque_pop_back( sub_queue );
327 mlt_deque_push_back( data_queue, p );
332 // Pick up first video and audio frames
333 if ( !done && !mlt_frame_is_test_audio( temp ) && !( mlt_properties_get_int( temp_properties, "hide" ) & 2 ) )
335 if ( !done && !mlt_frame_is_test_card( temp ) && !( mlt_properties_get_int( temp_properties, "hide" ) & 1 ) )
339 // Now stack callbacks
342 mlt_frame_push_audio( *frame, audio );
343 ( *frame )->get_audio = producer_get_audio;
348 mlt_properties video_properties = MLT_FRAME_PROPERTIES( video );
349 mlt_frame_push_service( *frame, video );
350 mlt_frame_push_service( *frame, producer_get_image );
351 mlt_properties_set_data( frame_properties, "data_queue", data_queue, 0, NULL, NULL );
352 mlt_properties_set_int( frame_properties, "width", mlt_properties_get_int( video_properties, "width" ) );
353 mlt_properties_set_int( frame_properties, "height", mlt_properties_get_int( video_properties, "height" ) );
354 mlt_properties_set_int( frame_properties, "real_width", mlt_properties_get_int( video_properties, "real_width" ) );
355 mlt_properties_set_int( frame_properties, "real_height", mlt_properties_get_int( video_properties, "real_height" ) );
356 mlt_properties_set_int( frame_properties, "progressive", mlt_properties_get_int( video_properties, "progressive" ) );
357 mlt_properties_set_double( frame_properties, "aspect_ratio", mlt_properties_get_double( video_properties, "aspect_ratio" ) );
360 mlt_frame_set_position( *frame, mlt_producer_frame( parent ) );
361 mlt_properties_set_int( MLT_FRAME_PROPERTIES( *frame ), "test_audio", audio == NULL );
362 mlt_properties_set_int( MLT_FRAME_PROPERTIES( *frame ), "test_image", video == NULL );
364 else if ( producer != NULL )
366 mlt_producer_seek( producer, mlt_producer_frame( parent ) );
367 mlt_producer_set_speed( producer, mlt_producer_get_speed( parent ) );
368 mlt_service_get_frame( this->producer, frame, track );
372 fprintf( stderr, "tractor without a multitrack!!\n" );
373 mlt_service_get_frame( this->producer, frame, track );
376 // Prepare the next frame
377 mlt_producer_prepare_next( parent );
379 // Indicate our found status
384 // Generate a test card
385 *frame = mlt_frame_init( );
390 /** Close the tractor.
393 void mlt_tractor_close( mlt_tractor this )
395 if ( this != NULL && mlt_properties_dec_ref( MLT_TRACTOR_PROPERTIES( this ) ) <= 0 )
397 this->parent.close = NULL;
398 mlt_producer_close( &this->parent );