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_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 producer
->get_frame
= producer_get_frame
;
93 producer
->close
= ( mlt_destructor
)mlt_tractor_close
;
94 producer
->close_object
= this;
105 /** Get the service object associated to the tractor.
108 mlt_service
mlt_tractor_service( mlt_tractor
this )
110 return mlt_producer_service( &this->parent
);
113 /** Get the producer object associated to the tractor.
116 mlt_producer
mlt_tractor_producer( mlt_tractor
this )
118 return this != NULL ?
&this->parent
: NULL
;
121 /** Get the properties object associated to the tractor.
124 mlt_properties
mlt_tractor_properties( mlt_tractor
this )
126 return mlt_producer_properties( &this->parent
);
129 /** Get the field this tractor is harvesting.
132 mlt_field
mlt_tractor_field( mlt_tractor
this )
134 return mlt_properties_get_data( mlt_tractor_properties( this ), "field", NULL
);
137 /** Get the multitrack this tractor is pulling.
140 mlt_multitrack
mlt_tractor_multitrack( mlt_tractor
this )
142 return mlt_properties_get_data( mlt_tractor_properties( this ), "multitrack", NULL
);
145 /** Connect the tractor.
148 int mlt_tractor_connect( mlt_tractor
this, mlt_service producer
)
150 int ret
= mlt_service_connect_producer( mlt_tractor_service( this ), producer
, 0 );
152 // This is the producer we're going to connect to
154 this->producer
= producer
;
159 static int producer_get_image( mlt_frame
this, uint8_t **buffer
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
161 mlt_properties properties
= mlt_frame_properties( this );
162 mlt_frame frame
= mlt_frame_pop_service( this );
163 mlt_properties_inherit( mlt_frame_properties( frame
), properties
);
164 mlt_frame_get_image( frame
, buffer
, format
, width
, height
, writable
);
165 mlt_properties_set_data( properties
, "image", *buffer
, *width
* *height
* 2, NULL
, NULL
);
166 mlt_properties_set_int( properties
, "width", *width
);
167 mlt_properties_set_int( properties
, "height", *height
);
171 static int producer_get_audio( mlt_frame
this, int16_t **buffer
, mlt_audio_format
*format
, int *frequency
, int *channels
, int *samples
)
173 mlt_properties properties
= mlt_frame_properties( this );
174 mlt_frame frame
= mlt_frame_pop_audio( this );
175 mlt_properties_inherit( mlt_frame_properties( frame
), properties
);
176 mlt_frame_get_audio( frame
, buffer
, format
, frequency
, channels
, samples
);
177 mlt_properties_set_data( properties
, "audio", *buffer
, 0, NULL
, NULL
);
178 mlt_properties_set_int( properties
, "frequency", *frequency
);
179 mlt_properties_set_int( properties
, "channels", *channels
);
183 /** Get the next frame.
186 static int producer_get_frame( mlt_producer parent
, mlt_frame_ptr frame
, int track
)
188 mlt_tractor
this = parent
->child
;
190 // We only respond to the first track requests
191 if ( track
== 0 && this->producer
!= NULL
)
195 mlt_frame temp
= NULL
;
198 // Get the properties of the parent producer
199 mlt_properties properties
= mlt_producer_properties( parent
);
201 // Try to obtain the multitrack associated to the tractor
202 mlt_multitrack multitrack
= mlt_properties_get_data( properties
, "multitrack", NULL
);
204 // Or a specific producer
205 mlt_producer producer
= mlt_properties_get_data( properties
, "producer", NULL
);
207 // If we don't have one, we're in trouble...
208 if ( multitrack
!= NULL
)
210 // Used to garbage collect all frames
213 // Get the id of the tractor
214 char *id
= mlt_properties_get( properties
, "_unique_id" );
216 // Will be used to store the frame properties object
217 mlt_properties frame_properties
= NULL
;
219 // We'll store audio and video frames to use here
220 mlt_frame audio
= NULL
;
221 mlt_frame video
= NULL
;
223 // Get the multitrack's producer
224 mlt_producer target
= mlt_multitrack_producer( multitrack
);
225 mlt_producer_seek( target
, mlt_producer_frame( parent
) );
226 mlt_producer_set_speed( target
, mlt_producer_get_speed( parent
) );
228 // We will create one frame and attach everything to it
229 *frame
= mlt_frame_init( );
231 // Get the properties of the frame
232 frame_properties
= mlt_frame_properties( *frame
);
234 // Loop through each of the tracks we're harvesting
235 for ( i
= 0; !done
; i
++ )
237 // Get a frame from the producer
238 mlt_service_get_frame( this->producer
, &temp
, i
);
240 // Check for last track
241 done
= mlt_properties_get_int( mlt_frame_properties( temp
), "last_track" );
243 // We store all frames with a destructor on the output frame
244 sprintf( label
, "_%s_%d", id
, count
++ );
245 mlt_properties_set_data( frame_properties
, label
, temp
, 0, ( mlt_destructor
)mlt_frame_close
, NULL
);
247 // Pick up first video and audio frames
248 if ( !done
&& !mlt_frame_is_test_audio( temp
) && !( mlt_properties_get_int( mlt_frame_properties( temp
), "hide" ) & 2 ) )
250 if ( !done
&& !mlt_frame_is_test_card( temp
) && !( mlt_properties_get_int( mlt_frame_properties( temp
), "hide" ) & 1 ) )
254 // Now stack callbacks
257 mlt_frame_push_audio( *frame
, audio
);
258 ( *frame
)->get_audio
= producer_get_audio
;
259 mlt_properties_inherit( mlt_frame_properties( *frame
), mlt_frame_properties( audio
) );
264 mlt_frame_push_service( *frame
, video
);
265 mlt_frame_push_service( *frame
, producer_get_image
);
266 mlt_properties_inherit( mlt_frame_properties( *frame
), mlt_frame_properties( video
) );
269 mlt_properties_set_int( mlt_frame_properties( *frame
), "test_audio", audio
== NULL
);
270 mlt_properties_set_int( mlt_frame_properties( *frame
), "test_image", video
== NULL
);
272 else if ( producer
!= NULL
)
274 mlt_producer_seek( producer
, mlt_producer_frame( parent
) );
275 mlt_producer_set_speed( producer
, mlt_producer_get_speed( parent
) );
276 mlt_service_get_frame( this->producer
, frame
, track
);
280 fprintf( stderr
, "tractor without a multitrack!!\n" );
281 mlt_service_get_frame( this->producer
, frame
, track
);
284 // Prepare the next frame
285 mlt_producer_prepare_next( parent
);
287 // Indicate our found status
292 // Generate a test card
293 *frame
= mlt_frame_init( );
298 /** Close the tractor.
301 void mlt_tractor_close( mlt_tractor
this )
303 if ( this != NULL
&& mlt_properties_dec_ref( mlt_tractor_properties( this ) ) <= 0 )
305 this->parent
.close
= NULL
;
306 mlt_producer_close( &this->parent
);