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
);
46 /** Constructor for the tractor.
49 mlt_tractor
mlt_tractor_init( )
51 mlt_tractor
this = calloc( sizeof( struct mlt_tractor_s
), 1 );
54 mlt_producer producer
= &this->parent
;
55 if ( mlt_producer_init( producer
, this ) == 0 )
57 mlt_properties_set( mlt_producer_properties( producer
), "resource", "<tractor>" );
58 mlt_properties_set( mlt_producer_properties( producer
), "mlt_type", "mlt_producer" );
59 mlt_properties_set( mlt_producer_properties( producer
), "mlt_service", "tractor" );
61 producer
->get_frame
= producer_get_frame
;
62 producer
->close
= ( mlt_destructor
)mlt_tractor_close
;
63 producer
->close_object
= this;
74 mlt_tractor
mlt_tractor_new( )
76 mlt_tractor
this = calloc( sizeof( struct mlt_tractor_s
), 1 );
79 mlt_producer producer
= &this->parent
;
80 if ( mlt_producer_init( producer
, this ) == 0 )
82 mlt_multitrack multitrack
= mlt_multitrack_init( );
83 mlt_field field
= mlt_field_new( multitrack
, this );
84 mlt_properties props
= mlt_producer_properties( producer
);
86 mlt_properties_set( props
, "resource", "<tractor>" );
87 mlt_properties_set( props
, "mlt_type", "mlt_producer" );
88 mlt_properties_set( props
, "mlt_service", "tractor" );
89 mlt_properties_set_position( props
, "in", 0 );
90 mlt_properties_set_position( props
, "out", 0 );
91 mlt_properties_set_position( props
, "length", 0 );
92 mlt_properties_set_data( props
, "multitrack", multitrack
, 0, ( mlt_destructor
)mlt_multitrack_close
, NULL
);
93 mlt_properties_set_data( props
, "field", field
, 0, ( mlt_destructor
)mlt_field_close
, NULL
);
95 producer
->get_frame
= producer_get_frame
;
96 producer
->close
= ( mlt_destructor
)mlt_tractor_close
;
97 producer
->close_object
= this;
108 /** Get the service object associated to the tractor.
111 mlt_service
mlt_tractor_service( mlt_tractor
this )
113 return mlt_producer_service( &this->parent
);
116 /** Get the producer object associated to the tractor.
119 mlt_producer
mlt_tractor_producer( mlt_tractor
this )
121 return this != NULL ?
&this->parent
: NULL
;
124 /** Get the properties object associated to the tractor.
127 mlt_properties
mlt_tractor_properties( mlt_tractor
this )
129 return mlt_producer_properties( &this->parent
);
132 /** Get the field this tractor is harvesting.
135 mlt_field
mlt_tractor_field( mlt_tractor
this )
137 return mlt_properties_get_data( mlt_tractor_properties( this ), "field", NULL
);
140 /** Get the multitrack this tractor is pulling.
143 mlt_multitrack
mlt_tractor_multitrack( mlt_tractor
this )
145 return mlt_properties_get_data( mlt_tractor_properties( this ), "multitrack", NULL
);
148 /** Ensure the tractors in/out points match the multitrack.
151 void mlt_tractor_refresh( mlt_tractor
this )
153 mlt_multitrack multitrack
= mlt_tractor_multitrack( this );
154 mlt_properties properties
= mlt_multitrack_properties( multitrack
);
155 mlt_properties self
= mlt_tractor_properties( this );
156 mlt_multitrack_refresh( multitrack
);
157 mlt_properties_set_position( self
, "in", 0 );
158 mlt_properties_set_position( self
, "out", mlt_properties_get_position( properties
, "out" ) );
159 mlt_properties_set_position( self
, "length", mlt_properties_get_position( properties
, "length" ) );
162 /** Connect the tractor.
165 int mlt_tractor_connect( mlt_tractor
this, mlt_service producer
)
167 int ret
= mlt_service_connect_producer( mlt_tractor_service( this ), producer
, 0 );
169 // This is the producer we're going to connect to
171 this->producer
= producer
;
176 /** Set the producer for a specific track.
179 int mlt_tractor_set_track( mlt_tractor
this, mlt_producer producer
, int index
)
181 int error
= mlt_multitrack_connect( mlt_tractor_multitrack( this ), producer
, index
);
182 mlt_tractor_refresh( this );
186 /** Get the producer for a specific track.
189 mlt_producer
mlt_tractor_get_track( mlt_tractor
this, int index
)
191 return mlt_multitrack_track( mlt_tractor_multitrack( this ), index
);
194 static int producer_get_image( mlt_frame
this, uint8_t **buffer
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
196 mlt_properties properties
= mlt_frame_properties( this );
197 mlt_frame frame
= mlt_frame_pop_service( this );
198 mlt_properties_inherit( mlt_frame_properties( frame
), properties
);
199 mlt_frame_get_image( frame
, buffer
, format
, width
, height
, writable
);
200 mlt_properties_set_data( properties
, "image", *buffer
, *width
* *height
* 2, NULL
, NULL
);
201 mlt_properties_set_int( properties
, "width", *width
);
202 mlt_properties_set_int( properties
, "height", *height
);
206 static int producer_get_audio( mlt_frame
this, int16_t **buffer
, mlt_audio_format
*format
, int *frequency
, int *channels
, int *samples
)
208 mlt_properties properties
= mlt_frame_properties( this );
209 mlt_frame frame
= mlt_frame_pop_audio( this );
210 mlt_properties_inherit( mlt_frame_properties( frame
), properties
);
211 mlt_frame_get_audio( frame
, buffer
, format
, frequency
, channels
, samples
);
212 mlt_properties_set_data( properties
, "audio", *buffer
, 0, NULL
, NULL
);
213 mlt_properties_set_int( properties
, "frequency", *frequency
);
214 mlt_properties_set_int( properties
, "channels", *channels
);
218 /** Get the next frame.
221 static int producer_get_frame( mlt_producer parent
, mlt_frame_ptr frame
, int track
)
223 mlt_tractor
this = parent
->child
;
225 // We only respond to the first track requests
226 if ( track
== 0 && this->producer
!= NULL
)
230 mlt_frame temp
= NULL
;
233 // Get the properties of the parent producer
234 mlt_properties properties
= mlt_producer_properties( parent
);
236 // Try to obtain the multitrack associated to the tractor
237 mlt_multitrack multitrack
= mlt_properties_get_data( properties
, "multitrack", NULL
);
239 // Or a specific producer
240 mlt_producer producer
= mlt_properties_get_data( properties
, "producer", NULL
);
242 // If we don't have one, we're in trouble...
243 if ( multitrack
!= NULL
)
245 // Used to garbage collect all frames
248 // Get the id of the tractor
249 char *id
= mlt_properties_get( properties
, "_unique_id" );
251 // Will be used to store the frame properties object
252 mlt_properties frame_properties
= NULL
;
254 // We'll store audio and video frames to use here
255 mlt_frame audio
= NULL
;
256 mlt_frame video
= NULL
;
258 // Get the multitrack's producer
259 mlt_producer target
= mlt_multitrack_producer( multitrack
);
260 mlt_producer_seek( target
, mlt_producer_frame( parent
) );
261 mlt_producer_set_speed( target
, mlt_producer_get_speed( parent
) );
263 // We will create one frame and attach everything to it
264 *frame
= mlt_frame_init( );
266 // Get the properties of the frame
267 frame_properties
= mlt_frame_properties( *frame
);
269 // Loop through each of the tracks we're harvesting
270 for ( i
= 0; !done
; i
++ )
272 // Get a frame from the producer
273 mlt_service_get_frame( this->producer
, &temp
, i
);
275 // Check for last track
276 done
= mlt_properties_get_int( mlt_frame_properties( temp
), "last_track" );
278 // We store all frames with a destructor on the output frame
279 sprintf( label
, "_%s_%d", id
, count
++ );
280 mlt_properties_set_data( frame_properties
, label
, temp
, 0, ( mlt_destructor
)mlt_frame_close
, NULL
);
282 // Pick up first video and audio frames
283 if ( !done
&& !mlt_frame_is_test_audio( temp
) && !( mlt_properties_get_int( mlt_frame_properties( temp
), "hide" ) & 2 ) )
285 if ( !done
&& !mlt_frame_is_test_card( temp
) && !( mlt_properties_get_int( mlt_frame_properties( temp
), "hide" ) & 1 ) )
289 // Now stack callbacks
292 mlt_frame_push_audio( *frame
, audio
);
293 ( *frame
)->get_audio
= producer_get_audio
;
294 mlt_properties_inherit( mlt_frame_properties( *frame
), mlt_frame_properties( audio
) );
299 mlt_frame_push_service( *frame
, video
);
300 mlt_frame_push_service( *frame
, producer_get_image
);
301 mlt_properties_inherit( mlt_frame_properties( *frame
), mlt_frame_properties( video
) );
304 mlt_properties_set_int( mlt_frame_properties( *frame
), "test_audio", audio
== NULL
);
305 mlt_properties_set_int( mlt_frame_properties( *frame
), "test_image", video
== NULL
);
307 else if ( producer
!= NULL
)
309 mlt_producer_seek( producer
, mlt_producer_frame( parent
) );
310 mlt_producer_set_speed( producer
, mlt_producer_get_speed( parent
) );
311 mlt_service_get_frame( this->producer
, frame
, track
);
315 fprintf( stderr
, "tractor without a multitrack!!\n" );
316 mlt_service_get_frame( this->producer
, frame
, track
);
319 // Prepare the next frame
320 mlt_producer_prepare_next( parent
);
322 // Indicate our found status
327 // Generate a test card
328 *frame
= mlt_frame_init( );
333 /** Close the tractor.
336 void mlt_tractor_close( mlt_tractor
this )
338 if ( this != NULL
&& mlt_properties_dec_ref( mlt_tractor_properties( this ) ) <= 0 )
340 this->parent
.close
= NULL
;
341 mlt_producer_close( &this->parent
);