First draft of event handling

[melted] / src / framework / mlt_service.c

diff --git a/src/framework/mlt_service.c b/src/framework/mlt_service.c
index 3ebf0ad..6df3630 100644 (file)
--- a/src/framework/mlt_service.c
+++ b/src/framework/mlt_service.c
@@ -53,12 +53,15 @@ mlt_service_base;
 static void mlt_service_disconnect( mlt_service this );
 static void mlt_service_connect( mlt_service this, mlt_service that );
 static int service_get_frame( mlt_service this, mlt_frame_ptr frame, int index );
+static void mlt_service_property_changed( mlt_listener, mlt_properties owner, mlt_service this, void **args );
 
 /** Constructor
 */
 
 int mlt_service_init( mlt_service this, void *child )
 {
+       int error = 0;
+
        // Initialise everything to NULL
        memset( this, 0, sizeof( struct mlt_service_s ) );
 
@@ -72,7 +75,23 @@ int mlt_service_init( mlt_service this, void *child )
        this->get_frame = service_get_frame;
        
        // Initialise the properties
-       return mlt_properties_init( &this->parent, this );
+       error = mlt_properties_init( &this->parent, this );
+       if ( error == 0 )
+       {
+               this->parent.close = ( mlt_destructor )mlt_service_close;
+               this->parent.close_object = this;
+
+               mlt_events_init( &this->parent );
+               mlt_events_register( &this->parent, "property-changed", ( mlt_transmitter )mlt_service_property_changed );
+       }
+
+       return error;
+}
+
+static void mlt_service_property_changed( mlt_listener listener, mlt_properties owner, mlt_service this, void **args )
+{
+       if ( listener != NULL )
+               listener( owner, this, ( char * )args[ 0 ] );
 }
 
 /** Connect a producer service.
@@ -110,6 +129,13 @@ int mlt_service_connect_producer( mlt_service this, mlt_service producer, int in
        // If we have space, assign the input
        if ( base->in != NULL && index >= 0 && index < base->size )
        {
+               // Get the current service
+               mlt_service current = base->in[ index ];
+
+               // Increment the reference count on this producer
+               if ( producer != NULL )
+                       mlt_properties_inc_ref( mlt_service_properties( producer ) );
+
                // Now we disconnect the producer service from its consumer
                mlt_service_disconnect( producer );
                
@@ -123,6 +149,9 @@ int mlt_service_connect_producer( mlt_service this, mlt_service producer, int in
                // Now we connect the producer to its connected consumer
                mlt_service_connect( producer, this );
 
+               // Close the current service
+               mlt_service_close( current );
+
                // Inform caller that all went well
                return 0;
        }
@@ -137,23 +166,53 @@ int mlt_service_connect_producer( mlt_service this, mlt_service producer, int in
 
 static void mlt_service_disconnect( mlt_service this )
 {
+       if ( this != NULL )
+       {
+               // Get the service base
+               mlt_service_base *base = this->local;
+
+               // Disconnect
+               base->out = NULL;
+       }
+}
+
+/** Obtain the consumer this service is connected to.
+*/
+
+mlt_service mlt_service_consumer( mlt_service this )
+{
        // Get the service base
        mlt_service_base *base = this->local;
 
-       // There's a bit more required here...
-       base->out = NULL;
+       // Return the connected consumer
+       return base->out;
 }
 
-/** Associate this service to the its consumer.
+/** Obtain the producer this service is connected to.
 */
 
-static void mlt_service_connect( mlt_service this, mlt_service that )
+mlt_service mlt_service_producer( mlt_service this )
 {
        // Get the service base
        mlt_service_base *base = this->local;
 
-       // There's a bit more required here...
-       base->out = that;
+       // Return the connected producer
+       return base->count > 0 ? base->in[ base->count - 1 ] : NULL;
+}
+
+/** Associate this service to the consumer.
+*/
+
+static void mlt_service_connect( mlt_service this, mlt_service that )
+{
+       if ( this != NULL )
+       {
+               // Get the service base
+               mlt_service_base *base = this->local;
+
+               // There's a bit more required here...
+               base->out = that;
+       }
 }
 
 /** Get the first connected producer service.
@@ -188,12 +247,23 @@ static int service_get_frame( mlt_service this, mlt_frame_ptr frame, int index )
        return 0;
 }
 
+/** Return the properties object.
+*/
+
+mlt_properties mlt_service_properties( mlt_service self )
+{
+       return self != NULL ? &self->parent : NULL;
+}
+
 /** Obtain a frame.
 */
 
 int mlt_service_get_frame( mlt_service this, mlt_frame_ptr frame, int index )
 {
-       return this->get_frame( this, frame, index );
+       if ( this != NULL )
+               return this->get_frame( this, frame, index );
+       *frame = mlt_frame_init( );
+       return 0;
 }
 
 /** Close the service.
@@ -201,9 +271,24 @@ int mlt_service_get_frame( mlt_service this, mlt_frame_ptr frame, int index )
 
 void mlt_service_close( mlt_service this )
 {
-       mlt_service_base *base = this->local;
-       free( base->in );
-       free( base );
-       mlt_properties_close( &this->parent );
+       if ( this != NULL && mlt_properties_dec_ref( mlt_service_properties( this ) ) <= 0 )
+       {
+               if ( this->close != NULL )
+               {
+                       this->close( this->close_object );
+               }
+               else
+               {
+                       mlt_service_base *base = this->local;
+                       int i = 0;
+                       for ( i = 0; i < base->count; i ++ )
+                               if ( base->in[ i ] != NULL )
+                                       mlt_service_close( base->in[ i ] );
+                       free( base->in );
+                       free( base );
+                       this->parent.close = NULL;
+                       mlt_properties_close( &this->parent );
+               }
+       }
 }