X-Git-Url: http://research.m1stereo.tv/gitweb?a=blobdiff_plain;f=src%2Fframework%2Fmlt_tractor.c;h=45918d50f460096ed1517659f00849488f5f4ac0;hb=4cc3727c580de72763117b1f6025c6a2aa623e5b;hp=18cae0cc6c22db1753d71ed8678f03b7fdac706b;hpb=d8c7fca58da2a1d5b2bb3f917bcf9798bd68bc1b;p=melted

diff --git a/src/framework/mlt_tractor.c b/src/framework/mlt_tractor.c
index 18cae0c..45918d5 100644
--- a/src/framework/mlt_tractor.c
+++ b/src/framework/mlt_tractor.c
@@ -201,8 +201,14 @@ mlt_producer mlt_tractor_get_track( mlt_tractor this, int index )
 	return mlt_multitrack_track( mlt_tractor_multitrack( this ), index );
 }
 
+static uint8_t *mlt_tractor_alpha_mask( mlt_frame frame )
+{
+	return mlt_properties_get_data( mlt_frame_properties( frame ), "alpha", NULL );
+}
+
 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 {
+	uint8_t *data = NULL;
 	mlt_properties properties = mlt_frame_properties( this );
 	mlt_frame frame = mlt_frame_pop_service( this );
 	mlt_properties_inherit( mlt_frame_properties( frame ), properties );
@@ -211,6 +217,9 @@ static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_forma
 	mlt_properties_set_int( properties, "width", *width );
 	mlt_properties_set_int( properties, "height", *height );
 	mlt_properties_set_double( properties, "aspect_ratio", mlt_frame_get_aspect_ratio( frame ) );
+	data = mlt_frame_get_alpha_mask( frame );
+	mlt_properties_set_data( properties, "alpha", data, 0, NULL, NULL );
+	this->get_alpha_mask = mlt_tractor_alpha_mask;
 	return 0;
 }