First draft of event handling

[melted] / src / framework / mlt_producer.c

diff --git a/src/framework/mlt_producer.c b/src/framework/mlt_producer.c
index c07b2b2..4fda305 100644 (file)
--- a/src/framework/mlt_producer.c
+++ b/src/framework/mlt_producer.c
@@ -31,6 +31,7 @@
 */
 
 static int producer_get_frame( mlt_service this, mlt_frame_ptr frame, int index );
+static void mlt_producer_property_changed( mlt_service owner, mlt_producer this, char *name );
 
 /** Constructor
 */
@@ -91,12 +92,24 @@ int mlt_producer_init( mlt_producer this, void *child )
 
                        // Override service get_frame
                        parent->get_frame = producer_get_frame;
+
+                       mlt_events_listen( properties, this, "property-changed", ( mlt_listener )mlt_producer_property_changed );
+                       mlt_events_register( properties, "producer-changed", NULL );
                }
        }
 
        return error;
 }
 
+/** Listener for property changes.
+*/
+
+static void mlt_producer_property_changed( mlt_service owner, mlt_producer this, char *name )
+{
+       if ( !strcmp( name, "in" ) || !strcmp( name, "out" ) || !strcmp( name, "length" ) )
+               mlt_events_fire( mlt_producer_properties( this ), "producer-changed", NULL );
+}
+
 /** Create a new producer.
 */
 
@@ -201,6 +214,8 @@ double mlt_producer_get_fps( mlt_producer this )
 
 int mlt_producer_set_in_and_out( mlt_producer this, mlt_position in, mlt_position out )
 {
+       mlt_properties properties = mlt_producer_properties( this );
+
        // Correct ins and outs if necessary
        if ( in < 0 )
                in = 0;
@@ -221,8 +236,11 @@ int mlt_producer_set_in_and_out( mlt_producer this, mlt_position in, mlt_positio
        }
 
        // Set the values
-       mlt_properties_set_position( mlt_producer_properties( this ), "in", in );
-       mlt_properties_set_position( mlt_producer_properties( this ), "out", out );
+       mlt_events_block( properties, properties );
+       mlt_properties_set_position( properties, "in", in );
+       mlt_properties_set_position( properties, "out", out );
+       mlt_events_unblock( properties, properties );
+       mlt_events_fire( properties, "producer-changed", NULL );
 
        return 0;
 }