--- /dev/null
+/*
+ * mlt_events.h -- event handling
+ * Copyright (C) 2004-2005 Ushodaya Enterprises Limited
+ * Author: Charles Yates <charles.yates@pandora.be>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+
+#include "mlt_properties.h"
+#include "mlt_events.h"
+
+/** Memory leak checks.
+*/
+
+//#define _MLT_EVENT_CHECKS_
+
+#ifdef _MLT_EVENT_CHECKS_
+static int events_created = 0;
+static int events_destroyed = 0;
+#endif
+
+struct mlt_events_struct
+{
+ mlt_properties owner;
+ mlt_properties list;
+};
+
+typedef struct mlt_events_struct *mlt_events;
+
+struct mlt_event_struct
+{
+ mlt_events owner;
+ int ref_count;
+ int block_count;
+ mlt_listener listener;
+ void *service;
+};
+
+/** Increment the reference count on this event.
+*/
+
+void mlt_event_inc_ref( mlt_event this )
+{
+ if ( this != NULL && this->owner != NULL )
+ this->ref_count ++;
+}
+
+/** Increment the block count on this event.
+*/
+
+void mlt_event_block( mlt_event this )
+{
+ if ( this != NULL && this->owner != NULL )
+ this->block_count ++;
+}
+
+/** Decrement the block count on this event.
+*/
+
+void mlt_event_unblock( mlt_event this )
+{
+ if ( this != NULL && this->owner != NULL )
+ this->block_count --;
+}
+
+/** Close this event.
+*/
+
+void mlt_event_close( mlt_event this )
+{
+ if ( this != NULL && this->owner != NULL )
+ {
+ if ( -- this->ref_count == 1 )
+ this->owner = NULL;
+ if ( this->ref_count <= 0 )
+ {
+#ifdef _MLT_EVENT_CHECKS_
+ events_destroyed ++;
+ fprintf( stderr, "Events created %d, destroyed %d\n", events_created, events_destroyed );
+#endif
+ free( this );
+ }
+ }
+}
+
+/** Forward declaration to private functions.
+*/
+
+static mlt_events mlt_events_fetch( mlt_properties );
+static void mlt_events_store( mlt_properties, mlt_events );
+static void mlt_events_close( mlt_events );
+
+/** Initialise the events structure.
+*/
+
+void mlt_events_init( mlt_properties this )
+{
+ mlt_events events = mlt_events_fetch( this );
+ if ( events == NULL )
+ {
+ events = malloc( sizeof( struct mlt_events_struct ) );
+ events->list = mlt_properties_new( );
+ mlt_events_store( this, events );
+ }
+}
+
+/** Register an event and transmitter.
+*/
+
+int mlt_events_register( mlt_properties this, char *id, mlt_transmitter transmitter )
+{
+ int error = 1;
+ mlt_events events = mlt_events_fetch( this );
+ if ( events != NULL )
+ {
+ mlt_properties list = events->list;
+ char temp[ 128 ];
+ error = mlt_properties_set_data( list, id, transmitter, 0, NULL, NULL );
+ sprintf( temp, "list:%s", id );
+ if ( mlt_properties_get_data( list, temp, NULL ) == NULL )
+ mlt_properties_set_data( list, temp, mlt_properties_new( ), 0, ( mlt_destructor )mlt_properties_close, NULL );
+ }
+ return error;
+}
+
+/** Fire an event.
+*/
+
+void mlt_events_fire( mlt_properties this, char *id, ... )
+{
+ mlt_events events = mlt_events_fetch( this );
+ if ( events != NULL )
+ {
+ int i = 0;
+ va_list alist;
+ void *args[ 10 ];
+ mlt_properties list = events->list;
+ mlt_properties listeners = NULL;
+ char temp[ 128 ];
+ mlt_transmitter transmitter = mlt_properties_get_data( list, id, NULL );
+ sprintf( temp, "list:%s", id );
+ listeners = mlt_properties_get_data( list, temp, NULL );
+
+ va_start( alist, id );
+ do
+ args[ i ] = va_arg( alist, void * );
+ while( args[ i ++ ] != NULL );
+ va_end( alist );
+
+ if ( listeners != NULL )
+ {
+ for ( i = 0; i < mlt_properties_count( listeners ); i ++ )
+ {
+ mlt_event event = mlt_properties_get_data_at( listeners, i, NULL );
+ if ( event != NULL && event->owner != NULL && event->block_count == 0 )
+ {
+ if ( transmitter != NULL )
+ transmitter( event->listener, event->owner, event->service, args );
+ else
+ event->listener( event->owner, event->service );
+ }
+ }
+ }
+ }
+}
+
+/** Register a listener.
+*/
+
+mlt_event mlt_events_listen( mlt_properties this, void *service, char *id, mlt_listener listener )
+{
+ mlt_event event = NULL;
+ mlt_events events = mlt_events_fetch( this );
+ if ( events != NULL )
+ {
+ mlt_properties list = events->list;
+ mlt_properties listeners = NULL;
+ char temp[ 128 ];
+ sprintf( temp, "list:%s", id );
+ listeners = mlt_properties_get_data( list, temp, NULL );
+ if ( listeners != NULL )
+ {
+ int first_null = -1;
+ int i = 0;
+ for ( i = 0; event == NULL && i < mlt_properties_count( listeners ); i ++ )
+ {
+ mlt_event entry = mlt_properties_get_data_at( listeners, i, NULL );
+ if ( entry != NULL && entry->owner != NULL )
+ {
+ if ( entry->service == service && entry->listener == listener )
+ event = entry;
+ }
+ else if ( ( entry == NULL || entry->owner == NULL ) && first_null == -1 )
+ {
+ first_null = i;
+ }
+ }
+
+ if ( event == NULL )
+ {
+ event = malloc( sizeof( struct mlt_event_struct ) );
+ if ( event != NULL )
+ {
+#ifdef _MLT_EVENT_CHECKS_
+ events_created ++;
+#endif
+ sprintf( temp, "%d", first_null == -1 ? mlt_properties_count( listeners ) : first_null );
+ event->owner = events;
+ event->ref_count = 0;
+ event->block_count = 0;
+ event->listener = listener;
+ event->service = service;
+ mlt_properties_set_data( listeners, temp, event, 0, ( mlt_destructor )mlt_event_close, NULL );
+ }
+ }
+
+ if ( event != NULL )
+ mlt_event_inc_ref( event );
+ }
+ }
+ return event;
+}
+
+/** Block all events for a given service.
+*/
+
+void mlt_events_block( mlt_properties this, void *service )
+{
+ mlt_events events = mlt_events_fetch( this );
+ if ( events != NULL )
+ {
+ int i = 0, j = 0;
+ mlt_properties list = events->list;
+ for ( j = 0; j < mlt_properties_count( list ); j ++ )
+ {
+ char *temp = mlt_properties_get_name( list, j );
+ if ( !strncmp( temp, "list:", 5 ) )
+ {
+ mlt_properties listeners = mlt_properties_get_data( list, temp, NULL );
+ for ( i = 0; i < mlt_properties_count( listeners ); i ++ )
+ {
+ mlt_event entry = mlt_properties_get_data_at( listeners, i, NULL );
+ if ( entry != NULL && entry->service == service )
+ mlt_event_block( entry );
+ }
+ }
+ }
+ }
+}
+
+/** Unblock all events for a given service.
+*/
+
+void mlt_events_unblock( mlt_properties this, void *service )
+{
+ mlt_events events = mlt_events_fetch( this );
+ if ( events != NULL )
+ {
+ int i = 0, j = 0;
+ mlt_properties list = events->list;
+ for ( j = 0; j < mlt_properties_count( list ); j ++ )
+ {
+ char *temp = mlt_properties_get_name( list, j );
+ if ( !strncmp( temp, "list:", 5 ) )
+ {
+ mlt_properties listeners = mlt_properties_get_data( list, temp, NULL );
+ for ( i = 0; i < mlt_properties_count( listeners ); i ++ )
+ {
+ mlt_event entry = mlt_properties_get_data_at( listeners, i, NULL );
+ if ( entry != NULL && entry->service == service )
+ mlt_event_unblock( entry );
+ }
+ }
+ }
+ }
+}
+
+/** Disconnect all events for a given service.
+*/
+
+void mlt_events_disconnect( mlt_properties this, void *service )
+{
+ mlt_events events = mlt_events_fetch( this );
+ if ( events != NULL )
+ {
+ int i = 0, j = 0;
+ mlt_properties list = events->list;
+ for ( j = 0; j < mlt_properties_count( list ); j ++ )
+ {
+ char *temp = mlt_properties_get_name( list, j );
+ if ( !strncmp( temp, "list:", 5 ) )
+ {
+ mlt_properties listeners = mlt_properties_get_data( list, temp, NULL );
+ for ( i = 0; i < mlt_properties_count( listeners ); i ++ )
+ {
+ mlt_event entry = mlt_properties_get_data_at( listeners, i, NULL );
+ char *name = mlt_properties_get_name( listeners, i );
+ if ( entry != NULL && entry->service == service )
+ mlt_properties_set_data( listeners, name, NULL, 0, NULL, NULL );
+ }
+ }
+ }
+ }
+}
+
+/** Fetch the events object.
+*/
+
+static mlt_events mlt_events_fetch( mlt_properties this )
+{
+ mlt_events events = NULL;
+ if ( this != NULL )
+ events = mlt_properties_get_data( this, "_events", NULL );
+ return events;
+}
+
+/** Store the events object.
+*/
+
+static void mlt_events_store( mlt_properties this, mlt_events events )
+{
+ if ( this != NULL && events != NULL )
+ mlt_properties_set_data( this, "_events", events, 0, ( mlt_destructor )mlt_events_close, NULL );
+}
+
+/** Close the events object.
+*/
+
+static void mlt_events_close( mlt_events events )
+{
+ if ( events != NULL )
+ {
+ mlt_properties_close( events->list );
+ free( events );
+ }
+}
+
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