new, faster waveform generator that emphasizes gain as opposed to shape

[melted] / src / framework / mlt_producer.c

diff --git a/src/framework/mlt_producer.c b/src/framework/mlt_producer.c
index 8ff5dc1..c07b2b2 100644 (file)
--- a/src/framework/mlt_producer.c
+++ b/src/framework/mlt_producer.c
@@ -296,8 +296,18 @@ static int producer_get_frame( mlt_service service, mlt_frame_ptr frame, int ind
        }
        else
        {
+               mlt_properties properties = mlt_producer_properties( this );
+               mlt_filter *filters = mlt_properties_get_data( properties, "_filters", NULL );
+               int count = mlt_properties_get_int( properties, "_filter_count" );
+               int i;
+
                // Get the frame from the implementation
                result = this->get_frame( this, frame, index );
+
+               // Process the frame with the attached filters
+               for ( i = 0; i < count; i ++ )
+                       if ( filters[ i ] != NULL )
+                               mlt_filter_process( filters[ i ], *frame );
        }
 
        // Copy the fps and speed of the producer onto the frame
@@ -311,6 +321,96 @@ static int producer_get_frame( mlt_service service, mlt_frame_ptr frame, int ind
        return 0;
 }
 
+/** Attach a filter.
+*/
+
+int mlt_producer_attach( mlt_producer this, mlt_filter filter )
+{
+       int error = this == NULL || filter == NULL;
+       if ( error == 0 )
+       {
+               int i = 0;
+               int size = 0;
+               mlt_properties properties = mlt_producer_properties( this );
+               mlt_filter *filters = mlt_properties_get_data( properties, "_filters", &size );
+               int count = mlt_properties_get_int( properties, "_filter_count" );
+
+               for ( i = 0; error == 0 && i < count; i ++ )
+                       if ( filters[ i ] == filter )
+                               error = 1;
+
+               if ( error == 0 )
+               {
+                       if ( count == size )
+                       {
+                               size += 10;
+                               filters = realloc( filters, size * sizeof( mlt_filter ) );
+                               mlt_properties_set_data( properties, "_filters", filters, size, NULL, NULL );
+                       }
+
+                       if ( filters != NULL )
+                       {
+                               mlt_properties_inc_ref( mlt_filter_properties( filter ) );
+                               filters[ count ++ ] = filter;
+                               mlt_properties_set_int( properties, "_filter_count", count );
+                       }
+                       else
+                       {
+                               error = 2;
+                       }
+               }
+       }
+       return error;
+}
+
+/** Detach a filter.
+*/
+
+int mlt_producer_detach( mlt_producer this, mlt_filter filter )
+{
+       int error = this == NULL || filter == NULL;
+       if ( error == 0 )
+       {
+               int i = 0;
+               int size = 0;
+               mlt_properties properties = mlt_producer_properties( this );
+               mlt_filter *filters = mlt_properties_get_data( properties, "_filters", &size );
+               int count = mlt_properties_get_int( properties, "_filter_count" );
+
+               for ( i = 0; i < count; i ++ )
+                       if ( filters[ i ] == filter )
+                               break;
+
+               if ( i < count )
+               {
+                       mlt_filter filter = filters[ i ];
+                       filters[ i ] = NULL;
+                       for ( i ++ ; i < count; i ++ )
+                               filters[ i - 1 ] = filters[ i ];
+                       mlt_properties_set_int( properties, "_filter_count", -- count );
+                       mlt_filter_close( filter );
+               }
+       }
+       return error;
+}
+
+/** Retrieve a filter.
+*/
+
+mlt_filter mlt_producer_filter( mlt_producer this, int index )
+{
+       mlt_filter filter = NULL;
+       if ( this != NULL )
+       {
+               mlt_properties properties = mlt_producer_properties( this );
+               mlt_filter *filters = mlt_properties_get_data( properties, "_filters", NULL );
+               int count = mlt_properties_get_int( properties, "_filter_count" );
+               if ( index >= 0 && index < count )
+                       filter = filters[ index ];
+       }
+       return filter;
+}
+
 /** Close the producer.
 */
 
@@ -318,6 +418,13 @@ void mlt_producer_close( mlt_producer this )
 {
        if ( this != NULL && mlt_properties_dec_ref( mlt_producer_properties( this ) ) <= 0 )
        {
+               mlt_properties properties = mlt_producer_properties( this );
+               mlt_filter *filters = mlt_properties_get_data( properties, "_filters", NULL );
+               int count = mlt_properties_get_int( properties, "_filter_count" );
+
+               while( count -- )
+                       mlt_producer_detach( this, filters[ 0 ] );
+
                this->parent.close = NULL;
 
                if ( this->close != NULL )