research.m1stereo.tv/gitweb/ - melted/blob - src/modules/westley/producer_westley.c

   1 /*
   2  * producer_libdv.c -- a libxml2 parser of mlt service networks
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Dan Dennedy <dan@dennedy.org>
   5  *
   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.
  10  *
  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.
  15  *
  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.
  19  */
  20
  21 // TODO: destroy unreferenced producers
  22
  23 #include "producer_westley.h"
  24 #include <framework/mlt.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <stdio.h>
  28
  29 #include <libxml/parser.h>
  30
  31 #define STACK_SIZE 1000
  32
  33 struct deserialise_context_s
  34 {
  35         mlt_service stack_service[ STACK_SIZE ];
  36         int stack_service_size;
  37         int track_count;
  38         mlt_properties producer_map;
  39         mlt_properties destructors;
  40 };
  41 typedef struct deserialise_context_s *deserialise_context;
  42
  43
  44 /** Push a service.
  45 */
  46
  47 static int context_push_service( deserialise_context this, mlt_service that )
  48 {
  49         int ret = this->stack_service_size >= STACK_SIZE;
  50         if ( ret == 0 )
  51                 this->stack_service[ this->stack_service_size ++ ] = that;
  52         return ret;
  53 }
  54
  55 /** Pop a service.
  56 */
  57
  58 static mlt_service context_pop_service( deserialise_context this )
  59 {
  60         mlt_service result = NULL;
  61         if ( this->stack_service_size > 0 )
  62                 result = this->stack_service[ -- this->stack_service_size ];
  63         return result;
  64 }
  65
  66 // Set the destructor on a new service
  67 static void track_service( mlt_properties properties, void *service, mlt_destructor destructor )
  68 {
  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 );
  73 }
  74
  75 static void on_start_tractor( deserialise_context context, const xmlChar *name, const xmlChar **atts)
  76 {
  77         mlt_service service = mlt_tractor_service( mlt_tractor_init() );
  78
  79         track_service( context->destructors, service, (mlt_destructor) mlt_tractor_close );
  80
  81         for ( ; atts != NULL && *atts != NULL; atts += 2 )
  82                 mlt_properties_set( mlt_service_properties( service ), (char*) atts[0], (char*) atts[1] );
  83
  84         context_push_service( context, service );
  85 }
  86
  87 static void on_start_multitrack( deserialise_context context, const xmlChar *name, const xmlChar **atts)
  88 {
  89         mlt_service service = mlt_multitrack_service( mlt_multitrack_init() );
  90
  91         track_service( context->destructors, service, (mlt_destructor) mlt_multitrack_close );
  92
  93         for ( ; atts != NULL && *atts != NULL; atts += 2 )
  94                 mlt_properties_set( mlt_service_properties( service ), (char*) atts[0], (char*) atts[1] );
  95
  96         context_push_service( context, service );
  97 }
  98
  99 static void on_start_playlist( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 100 {
 101         mlt_service service = mlt_playlist_service( mlt_playlist_init() );
 102         mlt_properties properties = mlt_service_properties( service );
 103
 104         track_service( context->destructors, service, (mlt_destructor) mlt_playlist_close );
 105
 106         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 107                 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
 108
 109         if ( mlt_properties_get( properties, "id" ) != NULL )
 110                 mlt_properties_set_data( context->producer_map, mlt_properties_get( properties, "id" ), service, 0, NULL, NULL );
 111
 112         context_push_service( context, service );
 113 }
 114
 115 static void on_start_producer( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 116 {
 117         mlt_properties properties = mlt_properties_new();
 118         mlt_service service = NULL;
 119
 120         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 121                 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
 122
 123         if ( mlt_properties_get( properties, "mlt_service" ) != NULL )
 124         {
 125                 service = MLT_SERVICE( mlt_factory_producer( mlt_properties_get( properties, "mlt_service" ),
 126                         mlt_properties_get( properties, "resource" ) ) );
 127         }
 128         else
 129         {
 130                 // Unspecified producer, use inigo
 131                 char *args[2] = { mlt_properties_get( properties, "resource" ), 0 };
 132                 service = MLT_SERVICE( mlt_factory_producer( "inigo", args ) );
 133         }
 134
 135         track_service( context->destructors, service, (mlt_destructor) mlt_producer_close );
 136
 137         // Add the producer to the producer map
 138         if ( mlt_properties_get( properties, "id" ) != NULL )
 139                 mlt_properties_set_data( context->producer_map, mlt_properties_get( properties, "id" ), service, 0, NULL, NULL );
 140
 141         mlt_properties_inherit( mlt_service_properties( service ), properties );
 142         mlt_properties_close( properties );
 143
 144         context_push_service( context, service );
 145 }
 146
 147 static void on_start_blank( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 148 {
 149         // Get the playlist from the stack
 150         mlt_service service = context_pop_service( context );
 151         mlt_position length = 0;
 152
 153         // Look for the length attribute
 154         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 155         {
 156                 if ( strcmp( atts[0], "length" ) == 0 )
 157                 {
 158                         length = atoll( atts[1] );
 159                         break;
 160                 }
 161         }
 162
 163         // Append a blank to the playlist
 164         mlt_playlist_blank( MLT_PLAYLIST( service ), length );
 165
 166         // Push the playlist back onto the stack
 167         context_push_service( context, service );
 168 }
 169
 170 static void on_start_entry_track( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 171 {
 172         // Look for the producer attribute
 173         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 174         {
 175                 if ( strcmp( atts[0], "producer" ) == 0 )
 176                 {
 177                         if ( mlt_properties_get_data( context->producer_map, (char*) atts[1], NULL ) !=  NULL )
 178                                 // Push the referenced producer onto the stack
 179                                 context_push_service( context, MLT_SERVICE( mlt_properties_get_data( context->producer_map, (char*) atts[1], NULL ) ) );
 180                         break;
 181                 }
 182         }
 183 }
 184
 185 static void on_start_filter( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 186 {
 187         char *id;
 188         mlt_properties properties = mlt_properties_new();
 189         char key[11];
 190         key[ 10 ] = '\0';
 191
 192         // Get the producer from the stack
 193         mlt_service producer = context_pop_service( context );
 194
 195         // Set the properties
 196         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 197                 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
 198
 199         // Create the filter
 200         mlt_service service = MLT_SERVICE( mlt_factory_filter( mlt_properties_get( properties, "mlt_service" ), NULL ) );
 201
 202         track_service( context->destructors, service, (mlt_destructor) mlt_filter_close );
 203
 204         // Connect the filter to the producer
 205         mlt_filter_connect( MLT_FILTER( service ), producer,
 206                 mlt_properties_get_int( properties, "track" ) );
 207
 208         // Propogate the properties
 209         mlt_properties_inherit( mlt_service_properties( service ), properties );
 210         mlt_properties_close( properties );
 211
 212         // Get the parent producer from the stack
 213         mlt_service tractor = context_pop_service( context );
 214
 215         if ( tractor != NULL )
 216         {
 217                 // Connect the filter to the tractor
 218                 if ( strcmp( mlt_properties_get( mlt_service_properties( tractor ), "resource" ), "<tractor>" ) == 0 )
 219                         mlt_tractor_connect( MLT_TRACTOR( tractor ), service );
 220
 221                 // Push the parent producer back onto the stack
 222                 context_push_service( context, tractor );
 223         }
 224
 225         // If a producer alias is in the producer_map, get it
 226         snprintf( key, 10, "%p", producer );
 227         if ( mlt_properties_get_data( context->producer_map, key, NULL ) != NULL )
 228                 producer = mlt_properties_get_data( context->producer_map, key, NULL );
 229
 230         // Put the producer in the producer map
 231         id = mlt_properties_get( mlt_service_properties( producer ), "id" );
 232         if ( id != NULL )
 233                 mlt_properties_set_data( context->producer_map, id, service, 0, NULL, NULL );
 234
 235         // For filter chain support, add an alias to the producer map
 236         snprintf( key, 10, "%p", service );
 237         mlt_properties_set_data( context->producer_map, key, producer, 0, NULL, NULL );
 238
 239         // Push the filter onto the stack
 240         context_push_service( context, service );
 241 }
 242
 243 static void on_start_transition( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 244 {
 245         mlt_properties properties = mlt_properties_new();
 246
 247         // Get the producer from the stack
 248         mlt_service producer = context_pop_service( context );
 249
 250         // Set the properties
 251         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 252                 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
 253
 254         // Create the transition
 255         mlt_service service = MLT_SERVICE( mlt_factory_transition( mlt_properties_get( properties, "mlt_service" ), NULL ) );
 256
 257         track_service( context->destructors, service, (mlt_destructor) mlt_transition_close );
 258
 259         // Propogate the properties
 260         mlt_properties_inherit( mlt_service_properties( service ), properties );
 261         mlt_properties_close( properties );
 262
 263         // Connect the filter to the producer
 264         mlt_transition_connect( MLT_TRANSITION( service ), producer,
 265                 mlt_properties_get_int( mlt_service_properties( service ), "a_track" ),
 266                 mlt_properties_get_int( mlt_service_properties( service ), "b_track" ) );
 267
 268         // Get the tractor from the stack
 269         mlt_service tractor = context_pop_service( context );
 270
 271         // Connect the tractor to the transition
 272         mlt_tractor_connect( MLT_TRACTOR( tractor ), service );
 273
 274         // Push the tractor back onto the stack
 275         context_push_service( context, tractor );
 276
 277         // Push the transition onto the stack
 278         context_push_service( context, service );
 279 }
 280
 281 static void on_end_multitrack( deserialise_context context, const xmlChar *name )
 282 {
 283         // Get the producer (multitrack) from the stack
 284         mlt_service producer = context_pop_service( context );
 285
 286         // Get the tractor from the stack
 287         mlt_service service = context_pop_service( context );
 288
 289         // Connect the tractor to the producer
 290         mlt_tractor_connect( MLT_TRACTOR( service ), producer );
 291         mlt_properties_set_data( mlt_service_properties( service ), "multitrack",
 292                 MLT_MULTITRACK( producer ), 0, NULL, NULL );
 293
 294         // Push the tractor back onto the stack
 295         context_push_service( context, service );
 296
 297         // Push the producer back onto the stack
 298         context_push_service( context, producer );
 299 }
 300
 301 static void on_end_playlist( deserialise_context context, const xmlChar *name )
 302 {
 303         // Get the producer (playlist) from the stack
 304         mlt_service producer = context_pop_service( context );
 305
 306         // Push the producer back onto the stack
 307         context_push_service( context, producer );
 308 }
 309
 310 static void on_end_track( deserialise_context context, const xmlChar *name )
 311 {
 312         // Get the producer from the stack
 313         mlt_service producer = context_pop_service( context );
 314
 315         // Get the multitrack from the stack
 316         mlt_service service = context_pop_service( context );
 317
 318         // Set the track on the multitrack
 319         mlt_multitrack_connect( MLT_MULTITRACK( service ),
 320                 MLT_PRODUCER( producer ),
 321                 context->track_count++ );
 322
 323         // Push the multitrack back onto the stack
 324         context_push_service( context, service );
 325 }
 326
 327 static void on_end_entry( deserialise_context context, const xmlChar *name )
 328 {
 329         // Get the producer from the stack
 330         mlt_service producer = context_pop_service( context );
 331
 332         // Get the playlist from the stack
 333         mlt_service service = context_pop_service( context );
 334
 335         // Append the producer to the playlist
 336         mlt_playlist_append_io( MLT_PLAYLIST( service ),
 337                 MLT_PRODUCER( producer ),
 338                 mlt_properties_get_position( mlt_service_properties( producer ), "in" ),
 339                 mlt_properties_get_position( mlt_service_properties( producer ), "out" ) );
 340
 341         // Push the playlist back onto the stack
 342         context_push_service( context, service );
 343 }
 344
 345 static void on_end_tractor( deserialise_context context, const xmlChar *name )
 346 {
 347         // Discard the last producer
 348         mlt_producer multitrack = MLT_PRODUCER( context_pop_service( context ) );
 349
 350         // Inherit the producer's properties
 351         mlt_properties properties = mlt_producer_properties( multitrack );
 352         mlt_properties_set_position( properties, "length", mlt_producer_get_out( multitrack ) + 1 );
 353         mlt_producer_set_in_and_out( multitrack, 0, mlt_producer_get_out( multitrack ) );
 354         mlt_properties_set_double( properties, "fps", mlt_producer_get_fps( multitrack ) );
 355 }
 356
 357 static void on_start_element( void *ctx, const xmlChar *name, const xmlChar **atts)
 358 {
 359         deserialise_context context = ( deserialise_context ) ctx;
 360
 361         if ( strcmp( name, "tractor" ) == 0 )
 362                 on_start_tractor( context, name, atts );
 363         else if ( strcmp( name, "multitrack" ) == 0 )
 364                 on_start_multitrack( context, name, atts );
 365         else if ( strcmp( name, "playlist" ) == 0 )
 366                 on_start_playlist( context, name, atts );
 367         else if ( strcmp( name, "producer" ) == 0 )
 368                 on_start_producer( context, name, atts );
 369         else if ( strcmp( name, "blank" ) == 0 )
 370                 on_start_blank( context, name, atts );
 371         else if ( strcmp( name, "entry" ) == 0 || strcmp( name, "track" ) == 0 )
 372                 on_start_entry_track( context, name, atts );
 373         else if ( strcmp( name, "filter" ) == 0 )
 374                 on_start_filter( context, name, atts );
 375         else if ( strcmp( name, "transition" ) == 0 )
 376                 on_start_transition( context, name, atts );
 377 }
 378
 379 static void on_end_element( void *ctx, const xmlChar *name )
 380 {
 381         deserialise_context context = ( deserialise_context ) ctx;
 382
 383         if ( strcmp( name, "multitrack" ) == 0 )
 384                 on_end_multitrack( context, name );
 385         else if ( strcmp( name, "playlist" ) == 0 )
 386                 on_end_playlist( context, name );
 387         else if ( strcmp( name, "track" ) == 0 )
 388                 on_end_track( context, name );
 389         else if ( strcmp( name, "entry" ) == 0 )
 390                 on_end_entry( context, name );
 391         else if ( strcmp( name, "tractor" ) == 0 )
 392                 on_end_tractor( context, name );
 393 }
 394
 395
 396 mlt_producer producer_westley_init( char *filename )
 397 {
 398         xmlSAXHandler *sax = calloc( 1, sizeof( xmlSAXHandler ) );
 399         struct deserialise_context_s *context = calloc( 1, sizeof( struct deserialise_context_s ) );
 400
 401         context->producer_map = mlt_properties_new();
 402         context->destructors = mlt_properties_new();
 403         // We need to track the number of registered filters
 404         mlt_properties_set_int( context->destructors, "registered", 0 );
 405         sax->startElement = on_start_element;
 406         sax->endElement = on_end_element;
 407
 408         xmlInitParser();
 409         xmlSAXUserParseFile( sax, context, filename );
 410         xmlCleanupParser();
 411         free( sax );
 412
 413         mlt_properties_close( context->producer_map );
 414
 415         mlt_service service = context_pop_service( context );
 416         // make the returned service destroy the connected services
 417         mlt_properties_set_data( mlt_service_properties( service ), "__destructors__", context->destructors, 0, (mlt_destructor) mlt_properties_close, NULL );
 418         free( context );
 419
 420         mlt_properties_set( mlt_service_properties( service ), "resource", filename );
 421
 422         return MLT_PRODUCER( service );
 423 }
 424