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_inherit( mlt_frame_properties( frame ), properties );
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 data = mlt_frame_get_alpha_mask( frame );
221 mlt_properties_set_data( properties, "alpha", data, 0, NULL, NULL );
222 this->get_alpha_mask = mlt_tractor_alpha_mask;
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_properties_inherit( mlt_frame_properties( frame ), properties );
231 mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
232 mlt_properties_set_data( properties, "audio", *buffer, 0, NULL, NULL );
233 mlt_properties_set_int( properties, "frequency", *frequency );
234 mlt_properties_set_int( properties, "channels", *channels );
238 /** Get the next frame.
241 static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int track )
243 mlt_tractor this = parent->child;
245 // We only respond to the first track requests
246 if ( track == 0 && this->producer != NULL )
250 mlt_frame temp = NULL;
253 // Get the properties of the parent producer
254 mlt_properties properties = mlt_producer_properties( parent );
256 // Try to obtain the multitrack associated to the tractor
257 mlt_multitrack multitrack = mlt_properties_get_data( properties, "multitrack", NULL );
259 // Or a specific producer
260 mlt_producer producer = mlt_properties_get_data( properties, "producer", NULL );
262 // If we don't have one, we're in trouble...
263 if ( multitrack != NULL )
265 // Used to garbage collect all frames
268 // Get the id of the tractor
269 char *id = mlt_properties_get( properties, "_unique_id" );
271 // Will be used to store the frame properties object
272 mlt_properties frame_properties = NULL;
274 // We'll store audio and video frames to use here
275 mlt_frame audio = NULL;
276 mlt_frame video = NULL;
278 // Determine which data_queue to pass on...
279 void *data_queue = NULL;
281 // Get the multitrack's producer
282 mlt_producer target = mlt_multitrack_producer( multitrack );
283 mlt_producer_seek( target, mlt_producer_frame( parent ) );
284 mlt_producer_set_speed( target, mlt_producer_get_speed( parent ) );
286 // We will create one frame and attach everything to it
287 *frame = mlt_frame_init( );
289 // Get the properties of the frame
290 frame_properties = mlt_frame_properties( *frame );
292 // Loop through each of the tracks we're harvesting
293 for ( i = 0; !done; i ++ )
295 // Get a frame from the producer
296 mlt_service_get_frame( this->producer, &temp, i );
298 // Check for last track
299 done = mlt_properties_get_int( mlt_frame_properties( temp ), "last_track" );
301 // We store all frames with a destructor on the output frame
302 sprintf( label, "_%s_%d", id, count ++ );
303 mlt_properties_set_data( frame_properties, label, temp, 0, ( mlt_destructor )mlt_frame_close, NULL );
305 // We want the last data_queue
306 if ( mlt_properties_get_data( mlt_frame_properties( temp ), "data_queue", NULL ) != NULL )
307 data_queue = mlt_properties_get_data( mlt_frame_properties( temp ), "data_queue", NULL );
309 // Pick up first video and audio frames
310 if ( !done && !mlt_frame_is_test_audio( temp ) && !( mlt_properties_get_int( mlt_frame_properties( temp ), "hide" ) & 2 ) )
312 if ( !done && !mlt_frame_is_test_card( temp ) && !( mlt_properties_get_int( mlt_frame_properties( temp ), "hide" ) & 1 ) )
316 // Now stack callbacks
319 mlt_frame_push_audio( *frame, audio );
320 ( *frame )->get_audio = producer_get_audio;
321 mlt_properties_inherit( mlt_frame_properties( *frame ), mlt_frame_properties( audio ) );
326 mlt_properties_set_data( mlt_frame_properties( *frame ), "data_queue", data_queue, 0, NULL, NULL );
327 mlt_frame_push_service( *frame, video );
328 mlt_frame_push_service( *frame, producer_get_image );
329 mlt_properties_inherit( mlt_frame_properties( *frame ), mlt_frame_properties( video ) );
332 mlt_properties_set_int( mlt_frame_properties( *frame ), "test_audio", audio == NULL );
333 mlt_properties_set_int( mlt_frame_properties( *frame ), "test_image", video == NULL );
335 else if ( producer != NULL )
337 mlt_producer_seek( producer, mlt_producer_frame( parent ) );
338 mlt_producer_set_speed( producer, mlt_producer_get_speed( parent ) );
339 mlt_service_get_frame( this->producer, frame, track );
343 fprintf( stderr, "tractor without a multitrack!!\n" );
344 mlt_service_get_frame( this->producer, frame, track );
347 // Prepare the next frame
348 mlt_producer_prepare_next( parent );
350 // Indicate our found status
355 // Generate a test card
356 *frame = mlt_frame_init( );
361 /** Close the tractor.
364 void mlt_tractor_close( mlt_tractor this )
366 if ( this != NULL && mlt_properties_dec_ref( mlt_tractor_properties( this ) ) <= 0 )
368 this->parent.close = NULL;
369 mlt_producer_close( &this->parent );