2 * producer_westley.c -- a libxml2 parser of mlt service networks
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Dan Dennedy <dan@dennedy.org>
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.
21 // TODO: destroy unreferenced producers
23 #include "producer_westley.h"
24 #include <framework/mlt.h>
29 #include <libxml/parser.h>
31 #define STACK_SIZE 1000
33 struct deserialise_context_s
35 mlt_service stack_service[ STACK_SIZE ];
36 int stack_service_size;
38 mlt_properties producer_map;
39 mlt_properties destructors;
41 typedef struct deserialise_context_s *deserialise_context;
47 static int context_push_service( deserialise_context this, mlt_service that )
49 int ret = this->stack_service_size >= STACK_SIZE;
51 this->stack_service[ this->stack_service_size ++ ] = that;
58 static mlt_service context_pop_service( deserialise_context this )
60 mlt_service result = NULL;
61 if ( this->stack_service_size > 0 )
62 result = this->stack_service[ -- this->stack_service_size ];
66 // Set the destructor on a new service
67 static void track_service( mlt_properties properties, void *service, mlt_destructor destructor )
69 int registered = mlt_properties_get_int( properties, "registered" );
70 char *key = mlt_properties_get( properties, "registered" );
71 mlt_properties_set_data( properties, key, service, 0, destructor, NULL );
72 mlt_properties_set_int( properties, "registered", ++ registered );
75 static void on_start_tractor( deserialise_context context, const xmlChar *name, const xmlChar **atts)
77 mlt_service service = mlt_tractor_service( mlt_tractor_init() );
78 mlt_properties properties = mlt_service_properties( service );
80 track_service( context->destructors, service, (mlt_destructor) mlt_tractor_close );
82 mlt_properties_set_position( properties, "length", 0 );
84 for ( ; atts != NULL && *atts != NULL; atts += 2 )
85 mlt_properties_set( mlt_service_properties( service ), (char*) atts[0], (char*) atts[1] );
87 if ( mlt_properties_get_position( properties, "length" ) < mlt_properties_get_position( properties, "out" ) )
89 mlt_position length = mlt_properties_get_position( properties, "out" ) + 1;
90 mlt_properties_set_position( properties, "length", length );
93 context_push_service( context, service );
96 static void on_start_multitrack( deserialise_context context, const xmlChar *name, const xmlChar **atts)
98 mlt_service service = mlt_multitrack_service( mlt_multitrack_init() );
100 track_service( context->destructors, service, (mlt_destructor) mlt_multitrack_close );
102 for ( ; atts != NULL && *atts != NULL; atts += 2 )
103 mlt_properties_set( mlt_service_properties( service ), (char*) atts[0], (char*) atts[1] );
105 context_push_service( context, service );
108 static void on_start_playlist( deserialise_context context, const xmlChar *name, const xmlChar **atts)
110 mlt_service service = mlt_playlist_service( mlt_playlist_init() );
111 mlt_properties properties = mlt_service_properties( service );
113 track_service( context->destructors, service, (mlt_destructor) mlt_playlist_close );
115 mlt_properties_set_position( properties, "length", 0 );
117 for ( ; atts != NULL && *atts != NULL; atts += 2 )
118 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
120 if ( mlt_properties_get( properties, "id" ) != NULL )
121 mlt_properties_set_data( context->producer_map, mlt_properties_get( properties, "id" ), service, 0, NULL, NULL );
123 if ( mlt_properties_get_position( properties, "length" ) < mlt_properties_get_position( properties, "out" ) )
125 mlt_position length = mlt_properties_get_position( properties, "out" ) + 1;
126 mlt_properties_set_position( properties, "length", length );
129 context_push_service( context, service );
132 static void on_start_producer( deserialise_context context, const xmlChar *name, const xmlChar **atts)
134 mlt_properties properties = mlt_properties_new();
135 mlt_service service = NULL;
137 for ( ; atts != NULL && *atts != NULL; atts += 2 )
139 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
142 if ( mlt_properties_get( properties, "mlt_service" ) != NULL )
144 service = MLT_SERVICE( mlt_factory_producer( mlt_properties_get( properties, "mlt_service" ),
145 mlt_properties_get( properties, "resource" ) ) );
149 // Unspecified producer, use inigo
150 char *args[2] = { mlt_properties_get( properties, "resource" ), 0 };
151 service = MLT_SERVICE( mlt_factory_producer( "inigo", args ) );
154 track_service( context->destructors, service, (mlt_destructor) mlt_producer_close );
156 // Add the producer to the producer map
157 if ( mlt_properties_get( properties, "id" ) != NULL )
158 mlt_properties_set_data( context->producer_map, mlt_properties_get( properties, "id" ), service, 0, NULL, NULL );
160 mlt_properties_inherit( mlt_service_properties( service ), properties );
161 mlt_properties_close( properties );
163 context_push_service( context, service );
166 static void on_start_blank( deserialise_context context, const xmlChar *name, const xmlChar **atts)
168 // Get the playlist from the stack
169 mlt_service service = context_pop_service( context );
170 mlt_position length = 0;
172 // Look for the length attribute
173 for ( ; atts != NULL && *atts != NULL; atts += 2 )
175 if ( strcmp( atts[0], "length" ) == 0 )
177 length = atoll( atts[1] );
182 // Append a blank to the playlist
183 mlt_playlist_blank( MLT_PLAYLIST( service ), length - 1 );
185 // Push the playlist back onto the stack
186 context_push_service( context, service );
189 static void on_start_entry_track( deserialise_context context, const xmlChar *name, const xmlChar **atts)
191 // Look for the producer attribute
192 for ( ; atts != NULL && *atts != NULL; atts += 2 )
194 if ( strcmp( atts[0], "producer" ) == 0 )
196 if ( mlt_properties_get_data( context->producer_map, (char*) atts[1], NULL ) != NULL )
197 // Push the referenced producer onto the stack
198 context_push_service( context, MLT_SERVICE( mlt_properties_get_data( context->producer_map, (char*) atts[1], NULL ) ) );
204 static void on_start_filter( deserialise_context context, const xmlChar *name, const xmlChar **atts)
207 mlt_properties properties = mlt_properties_new();
211 // Get the producer from the stack
212 mlt_service producer = context_pop_service( context );
214 // Set the properties
215 for ( ; atts != NULL && *atts != NULL; atts += 2 )
216 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
219 mlt_service service = MLT_SERVICE( mlt_factory_filter( mlt_properties_get( properties, "mlt_service" ), NULL ) );
221 track_service( context->destructors, service, (mlt_destructor) mlt_filter_close );
223 // Connect the filter to the producer
224 mlt_filter_connect( MLT_FILTER( service ), producer,
225 mlt_properties_get_int( properties, "track" ) );
227 // Set in and out from producer if non existant
228 if ( mlt_properties_get( properties, "in" ) == NULL )
229 mlt_properties_set_position( properties, "in", mlt_producer_get_in( MLT_PRODUCER( producer ) ) );
230 if ( mlt_properties_get( properties, "out" ) == NULL )
231 mlt_properties_set_position( properties, "out", mlt_producer_get_out( MLT_PRODUCER( producer ) ) );
233 // Propogate the properties
234 mlt_properties_inherit( mlt_service_properties( service ), properties );
235 mlt_properties_close( properties );
237 // Get the parent producer from the stack
238 mlt_service tractor = context_pop_service( context );
240 if ( tractor != NULL )
242 // Connect the filter to the tractor
243 if ( strcmp( mlt_properties_get( mlt_service_properties( tractor ), "resource" ), "<tractor>" ) == 0 )
244 mlt_tractor_connect( MLT_TRACTOR( tractor ), service );
246 // Push the parent producer back onto the stack
247 context_push_service( context, tractor );
250 // If a producer alias is in the producer_map, get it
251 snprintf( key, 10, "%p", producer );
252 if ( mlt_properties_get_data( context->producer_map, key, NULL ) != NULL )
253 producer = mlt_properties_get_data( context->producer_map, key, NULL );
255 // Put the producer in the producer map
256 id = mlt_properties_get( mlt_service_properties( producer ), "id" );
258 mlt_properties_set_data( context->producer_map, id, service, 0, NULL, NULL );
260 // For filter chain support, add an alias to the producer map
261 snprintf( key, 10, "%p", service );
262 mlt_properties_set_data( context->producer_map, key, producer, 0, NULL, NULL );
264 // Push the filter onto the stack
265 context_push_service( context, service );
268 static void on_start_transition( deserialise_context context, const xmlChar *name, const xmlChar **atts)
270 mlt_properties properties = mlt_properties_new();
272 // Get the producer from the stack
273 mlt_service producer = context_pop_service( context );
275 // Set the properties
276 for ( ; atts != NULL && *atts != NULL; atts += 2 )
277 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
279 // Create the transition
280 mlt_service service = MLT_SERVICE( mlt_factory_transition( mlt_properties_get( properties, "mlt_service" ), NULL ) );
282 track_service( context->destructors, service, (mlt_destructor) mlt_transition_close );
284 // Propogate the properties
285 mlt_properties_inherit( mlt_service_properties( service ), properties );
286 mlt_properties_close( properties );
288 // Connect the filter to the producer
289 mlt_transition_connect( MLT_TRANSITION( service ), producer,
290 mlt_properties_get_int( mlt_service_properties( service ), "a_track" ),
291 mlt_properties_get_int( mlt_service_properties( service ), "b_track" ) );
293 // Get the tractor from the stack
294 mlt_service tractor = context_pop_service( context );
296 // Connect the tractor to the transition
297 mlt_tractor_connect( MLT_TRACTOR( tractor ), service );
299 // Push the tractor back onto the stack
300 context_push_service( context, tractor );
302 // Push the transition onto the stack
303 context_push_service( context, service );
306 static void on_end_multitrack( deserialise_context context, const xmlChar *name )
308 // Get the producer (multitrack) from the stack
309 mlt_service producer = context_pop_service( context );
311 // Get the tractor from the stack
312 mlt_service service = context_pop_service( context );
314 // Connect the tractor to the producer
315 mlt_tractor_connect( MLT_TRACTOR( service ), producer );
316 mlt_properties_set_data( mlt_service_properties( service ), "multitrack",
317 MLT_MULTITRACK( producer ), 0, NULL, NULL );
319 // Push the tractor back onto the stack
320 context_push_service( context, service );
322 // Push the producer back onto the stack
323 context_push_service( context, producer );
326 static void on_end_playlist( deserialise_context context, const xmlChar *name )
328 // Get the producer (playlist) from the stack
329 mlt_service producer = context_pop_service( context );
331 // Push the producer back onto the stack
332 context_push_service( context, producer );
335 static void on_end_track( deserialise_context context, const xmlChar *name )
337 // Get the producer from the stack
338 mlt_service producer = context_pop_service( context );
340 // Get the multitrack from the stack
341 mlt_service service = context_pop_service( context );
343 // Set the track on the multitrack
344 mlt_multitrack_connect( MLT_MULTITRACK( service ),
345 MLT_PRODUCER( producer ),
346 context->track_count++ );
348 // Push the multitrack back onto the stack
349 context_push_service( context, service );
352 static void on_end_entry( deserialise_context context, const xmlChar *name )
354 // Get the producer from the stack
355 mlt_service producer = context_pop_service( context );
357 // Get the playlist from the stack
358 mlt_service service = context_pop_service( context );
360 // Append the producer to the playlist
361 mlt_playlist_append_io( MLT_PLAYLIST( service ),
362 MLT_PRODUCER( producer ),
363 mlt_properties_get_position( mlt_service_properties( producer ), "in" ),
364 mlt_properties_get_position( mlt_service_properties( producer ), "out" ) );
366 // Push the playlist back onto the stack
367 context_push_service( context, service );
370 static void on_end_tractor( deserialise_context context, const xmlChar *name )
372 // Get and discard the last producer
373 mlt_producer multitrack = MLT_PRODUCER( context_pop_service( context ) );
375 // Inherit the producer's properties
376 mlt_properties properties = mlt_producer_properties( multitrack );
377 mlt_properties_set_position( properties, "length", mlt_producer_get_out( multitrack ) + 1 );
378 mlt_producer_set_in_and_out( multitrack, 0, mlt_producer_get_out( multitrack ) );
379 mlt_properties_set_double( properties, "fps", mlt_producer_get_fps( multitrack ) );
382 static void on_start_element( void *ctx, const xmlChar *name, const xmlChar **atts)
384 deserialise_context context = ( deserialise_context ) ctx;
386 if ( strcmp( name, "tractor" ) == 0 )
387 on_start_tractor( context, name, atts );
388 else if ( strcmp( name, "multitrack" ) == 0 )
389 on_start_multitrack( context, name, atts );
390 else if ( strcmp( name, "playlist" ) == 0 )
391 on_start_playlist( context, name, atts );
392 else if ( strcmp( name, "producer" ) == 0 )
393 on_start_producer( context, name, atts );
394 else if ( strcmp( name, "blank" ) == 0 )
395 on_start_blank( context, name, atts );
396 else if ( strcmp( name, "entry" ) == 0 || strcmp( name, "track" ) == 0 )
397 on_start_entry_track( context, name, atts );
398 else if ( strcmp( name, "filter" ) == 0 )
399 on_start_filter( context, name, atts );
400 else if ( strcmp( name, "transition" ) == 0 )
401 on_start_transition( context, name, atts );
404 static void on_end_element( void *ctx, const xmlChar *name )
406 deserialise_context context = ( deserialise_context ) ctx;
408 if ( strcmp( name, "multitrack" ) == 0 )
409 on_end_multitrack( context, name );
410 else if ( strcmp( name, "playlist" ) == 0 )
411 on_end_playlist( context, name );
412 else if ( strcmp( name, "track" ) == 0 )
413 on_end_track( context, name );
414 else if ( strcmp( name, "entry" ) == 0 )
415 on_end_entry( context, name );
416 else if ( strcmp( name, "tractor" ) == 0 )
417 on_end_tractor( context, name );
421 mlt_producer producer_westley_init( char *filename )
424 xmlSAXHandler *sax = calloc( 1, sizeof( xmlSAXHandler ) );
425 struct deserialise_context_s *context = calloc( 1, sizeof( struct deserialise_context_s ) );
426 mlt_properties properties = NULL;
429 context->producer_map = mlt_properties_new();
430 context->destructors = mlt_properties_new();
431 // We need to track the number of registered filters
432 mlt_properties_set_int( context->destructors, "registered", 0 );
433 sax->startElement = on_start_element;
434 sax->endElement = on_end_element;
442 xmlSAXUserParseFile( sax, context, filename );
444 // Need the complete producer list for various reasons
445 properties = context->destructors;
447 // Get the last producer on the stack
448 mlt_service service = context_pop_service( context );
450 // Do we actually have a producer here?
451 if ( service != NULL )
453 // Now make sure we don't have a reference to the service in the properties
454 for ( i = mlt_properties_count( properties ) - 1; i >= 1; i -- )
456 char *name = mlt_properties_get_name( properties, i );
457 if ( mlt_properties_get_data( properties, name, NULL ) == service )
459 mlt_properties_set_data( properties, name, service, 0, NULL, NULL );
464 // We are done referencing destructor property list
465 // Set this var to service properties for convenience
466 properties = mlt_service_properties( service );
468 // make the returned service destroy the connected services
469 mlt_properties_set_data( properties, "__destructors__", context->destructors, 0, (mlt_destructor) mlt_properties_close, NULL );
471 // Now assign additional properties
472 mlt_properties_set( properties, "resource", filename );
474 // This tells consumer_westley not to deep copy
475 mlt_properties_set( properties, "westley", "was here" );
480 mlt_properties_close( properties );
483 free( context->stack_service );
484 mlt_properties_close( context->producer_map );
491 return MLT_PRODUCER( service );