#include <stdio.h>
#include <stdlib.h>
-/** Composition class.
-*/
-
-typedef struct
-{
- struct mlt_transition_s parent;
-}
-transition_composite;
-
/** Get the image.
*/
// Get the b frame from the stack
mlt_frame b_frame = mlt_frame_pop_frame( this );
- // Get the properties of the b frame
- mlt_properties b_props = mlt_frame_properties( b_frame );
-
- // Arbitrary composite defaults
- int x = 50;
- int y = 50;
- double weight = 1.0;
-
- // Override from b frame properties if provided
- if ( mlt_properties_get( b_props, "x" ) != NULL )
- x = mlt_properties_get_int( b_props, "x" );
- if ( mlt_properties_get( b_props, "y" ) != NULL )
- y = mlt_properties_get_int( b_props, "y" );
- if ( mlt_properties_get( b_props, "weight" ) != NULL )
- weight = mlt_properties_get_double( b_props, "weight" );
-
- // Composite the b_frame on the a_frame
- mlt_frame_composite_yuv( this, b_frame, x, y, weight );
-
- // Extract the a_frame image info
- *width = mlt_properties_get_int( a_props, "width" );
- *height = mlt_properties_get_int( a_props, "height" );
- *image = mlt_properties_get_data( a_props, "image", NULL );
-
- // Close the b_frame
- mlt_frame_close( b_frame );
+ if ( b_frame != NULL )
+ {
+ // Get the properties of the b frame
+ mlt_properties b_props = mlt_frame_properties( b_frame );
+
+ // Arbitrary composite defaults
+ int x = 0;
+ int y = 0;
+ double mix = 1.0;
+
+ // Override from b frame properties if provided
+ if ( mlt_properties_get( b_props, "x" ) != NULL )
+ x = mlt_properties_get_int( b_props, "x" );
+ if ( mlt_properties_get( b_props, "y" ) != NULL )
+ y = mlt_properties_get_int( b_props, "y" );
+ if ( mlt_properties_get( b_props, "image.mix" ) != NULL )
+ mix = mlt_properties_get_double( b_props, "image.mix" );
+
+ // Composite the b_frame on the a_frame
+ mlt_frame_composite_yuv( this, b_frame, x, y, mix );
+
+ // Extract the a_frame image info
+ *width = mlt_properties_get_int( a_props, "width" );
+ *height = mlt_properties_get_int( a_props, "height" );
+ *image = mlt_properties_get_data( a_props, "image", NULL );
+ }
+ else if ( a_props != NULL )
+ {
+ // Extract the a_frame image info
+ *width = mlt_properties_get_int( a_props, "width" );
+ *height = mlt_properties_get_int( a_props, "height" );
+ *image = mlt_properties_get_data( a_props, "image", NULL );
+ }
return 0;
}
static mlt_frame composite_process( mlt_transition this, mlt_frame a_frame, mlt_frame b_frame )
{
+ // Propogate the transition properties to the b frame
+ mlt_properties properties = mlt_transition_properties( this );
+ mlt_properties b_props = mlt_frame_properties( b_frame );
+
+ if ( mlt_properties_get( properties, "x" ) != NULL )
+ mlt_properties_set_int( b_props, "x", mlt_properties_get_int( properties, "x" ) );
+ if ( mlt_properties_get( properties, "y" ) != NULL )
+ mlt_properties_set_int( b_props, "y", mlt_properties_get_int( properties, "y" ) );
+
+ // Only if mix is specified, otherwise a producer may set the mix
+ if ( mlt_properties_get( properties, "mix" ) != NULL )
+ {
+ // A negative means dissolve
+ if ( mlt_properties_get_double( properties, "mix" ) < 0 )
+ {
+ // Determine the time position of this frame in the transition duration
+ mlt_position in = mlt_transition_get_in( this );
+ mlt_position out = mlt_transition_get_out( this );
+ mlt_position time = mlt_frame_get_position( b_frame );
+ double mix = ( double )( time - in ) / ( double )( out - in + 1 );
+ mlt_properties_set_double( b_props, "image.mix", mix );
+ }
+ else
+ mlt_properties_set_double( b_props, "image.mix", mlt_properties_get_double( properties, "mix" ) );
+ }
+
mlt_frame_push_get_image( a_frame, transition_get_image );
mlt_frame_push_frame( a_frame, b_frame );
+
return a_frame;
}
/** Constructor for the filter.
*/
-mlt_transition transition_composite_init( void *arg )
+mlt_transition transition_composite_init( char *arg )
{
- transition_composite *this = calloc( sizeof( transition_composite ), 1 );
- if ( this != NULL )
+ mlt_transition this = calloc( sizeof( struct mlt_transition_s ), 1 );
+ if ( this != NULL && mlt_transition_init( this, NULL ) == 0 )
{
- mlt_transition transition = &this->parent;
- mlt_transition_init( transition, this );
- transition->process = composite_process;
- return &this->parent;
+ this->process = composite_process;
+ if ( arg != NULL )
+ mlt_properties_set_double( mlt_transition_properties( this ), "mix", atof( arg ) );
}
- return NULL;
+ return this;
}