#include <stdio.h>
#include <stdlib.h>
-/** Get the image.
+/** Geometry struct.
+*/
+
+struct geometry_s
+{
+ float x;
+ float y;
+ float w;
+ float h;
+ float mix;
+};
+
+/** Parse a geometry property string.
+*/
+
+static void geometry_parse( struct geometry_s *geometry, struct geometry_s *defaults, char *property )
+{
+ // Assign from defaults if available
+ if ( defaults != NULL )
+ {
+ geometry->x = defaults->x;
+ geometry->y = defaults->y;
+ geometry->w = defaults->w;
+ geometry->h = defaults->h;
+ geometry->mix = defaults->mix;
+ }
+ else
+ {
+ geometry->mix = 100;
+ }
+
+ // Parse the geomtry string
+ if ( property != NULL )
+ sscanf( property, "%f,%f:%fx%f:%f", &geometry->x, &geometry->y, &geometry->w, &geometry->h, &geometry->mix );
+}
+
+/** Calculate real geometry.
+*/
+
+static void geometry_calculate( struct geometry_s *output, struct geometry_s *in, struct geometry_s *out, float position )
+{
+ // Calculate this frames geometry
+ output->x = in->x + ( out->x - in->x ) * position;
+ output->y = in->y + ( out->y - in->y ) * position;
+ output->w = in->w + ( out->w - in->w ) * position;
+ output->h = in->h + ( out->h - in->h ) * position;
+ output->mix = in->mix + ( out->mix - in->mix ) * position;
+}
+
+/** Calculate the position for this frame.
+*/
+
+static float position_calculate( mlt_transition this, mlt_frame frame )
+{
+ // Get the in and out position
+ mlt_position in = mlt_transition_get_in( this );
+ mlt_position out = mlt_transition_get_out( this );
+
+ // Get the position of the frame
+ mlt_position position = mlt_frame_get_position( frame );
+
+ // Now do the calcs
+ return ( float )( position - in ) / ( float )( out - in + 1 );
+}
+
+/** Composite function.
*/
-static int transition_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
+static int composite_yuv( uint8_t *p_dest, mlt_image_format format_dest, int width_dest, int height_dest, mlt_frame that, struct geometry_s geometry )
{
- // Get the properties of the a frame
- mlt_properties a_props = mlt_frame_properties( this );
+ int ret = 0;
+ uint8_t *p_src;
+ int i, j;
+ int stride_src;
+ int stride_dest;
+ int x_src = 0, y_src = 0;
+
+ mlt_image_format format_src = format_dest;
+ int x = ( int )( ( float )width_dest * geometry.x / 100 );
+ int y = ( int )( ( float )height_dest * geometry.y / 100 );
+ float weight = geometry.mix / 100;
+ int width_src = ( int )( ( float )width_dest * geometry.w / 100 );
+ int height_src = ( int )( ( float )height_dest * geometry.h / 100 );
+
+ x -= x % 2;
+
+ // optimization point - no work to do
+ if ( ( x < 0 && -x >= width_src ) || ( y < 0 && -y >= height_src ) )
+ return ret;
+
+ format_src = mlt_image_yuv422;
+ format_dest = mlt_image_yuv422;
+
+ mlt_frame_get_image( that, &p_src, &format_src, &width_src, &height_src, 1 /* writable */ );
+
+ stride_src = width_src * 2;
+ stride_dest = width_dest * 2;
+
+ // crop overlay off the left edge of frame
+ if ( x < 0 )
+ {
+ x_src = -x;
+ width_src -= x_src;
+ x = 0;
+ }
+
+ // crop overlay beyond right edge of frame
+ else if ( x + width_src > width_dest )
+ width_src = width_dest - x;
+
+ // crop overlay off the top edge of the frame
+ if ( y < 0 )
+ {
+ y_src = -y;
+ height_src -= y_src;
+ }
+ // crop overlay below bottom edge of frame
+ else if ( y + height_src > height_dest )
+ height_src = height_dest - y;
+
+ // offset pointer into overlay buffer based on cropping
+ p_src += x_src * 2 + y_src * stride_src;
+
+ // offset pointer into frame buffer based upon positive, even coordinates only!
+ p_dest += ( x < 0 ? 0 : x ) * 2 + ( y < 0 ? 0 : y ) * stride_dest;
+
+ // Get the alpha channel of the overlay
+ uint8_t *p_alpha = mlt_frame_get_alpha_mask( that );
+
+ // offset pointer into alpha channel based upon cropping
+ if ( p_alpha )
+ p_alpha += x_src + y_src * stride_src / 2;
+
+ uint8_t *p = p_src;
+ uint8_t *q = p_dest;
+ uint8_t *o = p_dest;
+ uint8_t *z = p_alpha;
+
+ uint8_t Y;
+ uint8_t UV;
+ uint8_t a;
+ float value;
+
+ // now do the compositing only to cropped extents
+ for ( i = 0; i < height_src; i++ )
+ {
+ p = p_src;
+ q = p_dest;
+ o = p_dest;
+ z = p_alpha;
+
+ for ( j = 0; j < width_src; j ++ )
+ {
+ Y = *p ++;
+ UV = *p ++;
+ a = ( z == NULL ) ? 255 : *z ++;
+ value = ( weight * ( float ) a / 255.0 );
+ *o ++ = (uint8_t)( Y * value + *q++ * ( 1 - value ) );
+ *o ++ = (uint8_t)( UV * value + *q++ * ( 1 - value ) );
+ }
+
+ p_src += stride_src;
+ p_dest += stride_dest;
+ if ( p_alpha )
+ p_alpha += stride_src / 2;
+ }
+
+ return ret;
+}
+
+
+/** Get the image.
+*/
+static int transition_get_image( mlt_frame a_frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
+{
// Get the b frame from the stack
- mlt_frame b_frame = mlt_frame_pop_frame( this );
+ mlt_frame b_frame = mlt_frame_pop_frame( a_frame );
+
+ // Get the image from the a frame
+ mlt_frame_get_image( a_frame, image, format, width, height, 1 );
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;
+ // Get the transition from the b frame
+ mlt_transition this = mlt_properties_get_data( b_props, "transition_composite", NULL );
- // 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" );
+ // Get the properties from the transition
+ mlt_properties properties = mlt_transition_properties( this );
- // Composite the b_frame on the a_frame
- mlt_frame_composite_yuv( this, b_frame, x, y, mix );
+ // Structures for geometry
+ struct geometry_s result;
+ struct geometry_s start;
+ struct geometry_s end;
- // 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 );
+ // Calculate the position
+ float position = position_calculate( this, a_frame );
+
+ // Now parse the geometries
+ geometry_parse( &start, NULL, mlt_properties_get( properties, "start" ) );
+ geometry_parse( &end, &start, mlt_properties_get( properties, "end" ) );
+
+ // Do the calculation
+ geometry_calculate( &result, &start, &end, position );
+
+ // Composite the b_frame on the a_frame
+ composite_yuv( *image, *format, *width, *height, b_frame, result );
}
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_properties_set_data( b_props, "transition_composite", this, 0, NULL, NULL );
mlt_frame_push_get_image( a_frame, transition_get_image );
mlt_frame_push_frame( a_frame, b_frame );
-
return a_frame;
}
if ( this != NULL && mlt_transition_init( this, NULL ) == 0 )
{
this->process = composite_process;
- if ( arg != NULL )
- mlt_properties_set_double( mlt_transition_properties( this ), "mix", atof( arg ) );
+ mlt_properties_set( mlt_transition_properties( this ), "start", arg != NULL ? arg : "85,5:10x10" );
+ mlt_properties_set( mlt_transition_properties( this ), "end", "" );
}
return this;
}
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