Multitrack and tractor producer-changed event

[melted] / src / framework / mlt_tractor.c

diff --git a/src/framework/mlt_tractor.c b/src/framework/mlt_tractor.c
index c07b704..769a26c 100644 (file)
--- a/src/framework/mlt_tractor.c
+++ b/src/framework/mlt_tractor.c
@@ -42,6 +42,7 @@ struct mlt_tractor_s
 */
 
 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int track );
+static void mlt_tractor_listener( mlt_multitrack tracks, mlt_tractor this );
 
 /** Constructor for the tractor.
 */
@@ -86,9 +87,14 @@ mlt_tractor mlt_tractor_new( )
                        mlt_properties_set( props, "resource", "<tractor>" );
                        mlt_properties_set( props, "mlt_type", "mlt_producer" );
                        mlt_properties_set( props, "mlt_service", "tractor" );
+                       mlt_properties_set_position( props, "in", 0 );
+                       mlt_properties_set_position( props, "out", 0 );
+                       mlt_properties_set_position( props, "length", 0 );
                        mlt_properties_set_data( props, "multitrack", multitrack, 0, ( mlt_destructor )mlt_multitrack_close, NULL );
                        mlt_properties_set_data( props, "field", field, 0, ( mlt_destructor )mlt_field_close, NULL );
 
+                       mlt_events_listen( mlt_multitrack_properties( multitrack ), this, "producer-changed", ( mlt_listener )mlt_tractor_listener );
+
                        producer->get_frame = producer_get_frame;
                        producer->close = ( mlt_destructor )mlt_tractor_close;
                        producer->close_object = this;
@@ -142,6 +148,29 @@ mlt_multitrack mlt_tractor_multitrack( mlt_tractor this )
        return mlt_properties_get_data( mlt_tractor_properties( this ), "multitrack", NULL );
 }
 
+/** Ensure the tractors in/out points match the multitrack.
+*/
+
+void mlt_tractor_refresh( mlt_tractor this )
+{
+       mlt_multitrack multitrack = mlt_tractor_multitrack( this );
+       mlt_properties properties = mlt_multitrack_properties( multitrack );
+       mlt_properties self = mlt_tractor_properties( this );
+       mlt_events_block( properties, self );
+       mlt_events_block( self, self );
+       mlt_multitrack_refresh( multitrack );
+       mlt_properties_set_position( self, "in", 0 );
+       mlt_properties_set_position( self, "out", mlt_properties_get_position( properties, "out" ) );
+       mlt_events_unblock( self, self );
+       mlt_events_unblock( properties, self );
+       mlt_properties_set_position( self, "length", mlt_properties_get_position( properties, "length" ) );
+}
+
+static void mlt_tractor_listener( mlt_multitrack tracks, mlt_tractor this )
+{
+       mlt_tractor_refresh( this );
+}
+
 /** Connect the tractor.
 */
 
@@ -156,6 +185,22 @@ int mlt_tractor_connect( mlt_tractor this, mlt_service producer )
        return ret;
 }
 
+/** Set the producer for a specific track.
+*/
+
+int mlt_tractor_set_track( mlt_tractor this, mlt_producer producer, int index )
+{
+       return mlt_multitrack_connect( mlt_tractor_multitrack( this ), producer, index );
+}
+
+/** Get the producer for a specific track.
+*/
+
+mlt_producer mlt_tractor_get_track( mlt_tractor this, int index )
+{
+       return mlt_multitrack_track( mlt_tractor_multitrack( this ), index );
+}
+
 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 {
        mlt_properties properties = mlt_frame_properties( this );