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230 lines
7.9 KiB
230 lines
7.9 KiB
/*
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* filter_shape.c -- Arbitrary alpha channel shaping
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* Copyright (C) 2005 Visual Media Fx Inc.
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* Author: Charles Yates <charles.yates@pandora.be>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "filter_shape.h"
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#include <string.h>
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#include <framework/mlt_factory.h>
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#include <framework/mlt_frame.h>
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#include <framework/mlt_producer.h>
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#include <framework/mlt_geometry.h>
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inline double smoothstep( const double e1, const double e2, const double a )
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{
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if ( a < e1 ) return 0.0;
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if ( a > e2 ) return 1.0;
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double v = ( a - e1 ) / ( e2 - e1 );
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return ( v * v * ( 3 - 2 * v ) );
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}
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/** Get the images and apply the luminance of the mask to the alpha of the frame.
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*/
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static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
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{
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// Fetch the data from the stack (mix, mask, filter)
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double mix = mlt_deque_pop_back_double( MLT_FRAME_IMAGE_STACK( this ) );
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mlt_frame mask = mlt_frame_pop_service( this );
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mlt_filter filter = mlt_frame_pop_service( this );
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// Obtain the constants
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double softness = mlt_properties_get_double( MLT_FILTER_PROPERTIES( filter ), "softness" );
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int use_luminance = mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "use_luminance" );
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int invert = mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "invert" ) * 255;
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// Render the frame
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if ( mlt_frame_get_image( this, image, format, width, height, writable ) == 0 && ( !use_luminance || ( int )mix != 1 ) )
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{
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// Get the alpha mask of the source
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uint8_t *alpha = mlt_frame_get_alpha_mask( this );
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// Obtain a scaled/distorted mask to match
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uint8_t *mask_img = NULL;
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mlt_image_format mask_fmt = mlt_image_yuv422;
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mlt_properties_set_int( MLT_FRAME_PROPERTIES( mask ), "distort", 1 );
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mlt_properties_pass_list( MLT_FRAME_PROPERTIES( mask ), MLT_FRAME_PROPERTIES( this ), "deinterlace,deinterlace_method,rescale.interp" );
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if ( mlt_frame_get_image( mask, &mask_img, &mask_fmt, width, height, 0 ) == 0 )
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{
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int size = *width * *height;
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uint8_t *p = alpha;
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double a = 0;
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double b = 0;
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if ( !use_luminance )
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{
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uint8_t *q = mlt_frame_get_alpha_mask( mask );
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while( size -- )
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{
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a = ( double )*q ++ / 255.0;
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b = 1.0 - smoothstep( a, a + softness, mix );
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*p = ( uint8_t )( *p * b ) ^ invert;
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p ++;
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}
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}
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else if ( ( int )mix != 1 )
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{
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uint8_t *q = mask_img;
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// Ensure softness tends to zero has mix tends to 1
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softness *= ( 1.0 - mix );
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while( size -- )
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{
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a = ( ( double )*q - 16 ) / 235.0;
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b = smoothstep( a, a + softness, mix );
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*p = ( uint8_t )( *p * b ) ^ invert;
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p ++;
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q += 2;
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}
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}
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}
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}
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return 0;
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}
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/** Filter processing.
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*/
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static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
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{
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// Obtain the shape instance
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char *resource = mlt_properties_get( MLT_FILTER_PROPERTIES( this ), "resource" );
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char *last_resource = mlt_properties_get( MLT_FILTER_PROPERTIES( this ), "_resource" );
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mlt_producer producer = mlt_properties_get_data( MLT_FILTER_PROPERTIES( this ), "instance", NULL );
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// Get the key framed values
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mlt_geometry alpha = mlt_properties_get_data( MLT_FILTER_PROPERTIES( this ), "_alpha", NULL );
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char *alpha_data = mlt_properties_get( MLT_FILTER_PROPERTIES( this ), "mix" );
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double alpha_mix = 0.0;
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// Calculate the position and length
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int position = mlt_frame_get_position( frame ) - mlt_filter_get_in( this );
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int in = mlt_filter_get_in( this );
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int out = mlt_filter_get_out( this );
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int length;
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// Special case for attached filters - in/out come through on the frame
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if ( out == 0 )
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{
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in = mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "in" );
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out = mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "out" );
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position -= in;
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}
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// Duration of the shape
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length = out - in + 1;
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// If we haven't created the instance or it's changed
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if ( producer == NULL || strcmp( resource, last_resource ) )
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{
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char temp[ 512 ];
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char *extension = strrchr( resource, '.' );
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// Store the last resource now
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mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "_resource", resource );
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// This is a hack - the idea is that we can indirectly reference the
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// luma modules pgm or png images by a short cut like %luma01.pgm - we then replace
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// the % with the full path to the image and use it if it exists, if not, check for
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// the file ending in a .png, and failing that, default to a fade in
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if ( strchr( resource, '%' ) )
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{
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FILE *test;
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sprintf( temp, "%s/lumas/%s/%s", mlt_factory_prefix( ), mlt_environment( "MLT_NORMALISATION" ), strchr( resource, '%' ) + 1 );
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test = fopen( temp, "r" );
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if ( test == NULL )
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{
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strcat( temp, ".png" );
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test = fopen( temp, "r" );
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}
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if ( test )
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fclose( test );
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else
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strcpy( temp, "colour:0x00000080" );
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resource = temp;
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extension = strrchr( resource, '.' );
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}
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producer = mlt_factory_producer( NULL, resource );
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if ( producer != NULL )
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mlt_properties_set( MLT_PRODUCER_PROPERTIES( producer ), "eof", "loop" );
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mlt_properties_set_data( MLT_FILTER_PROPERTIES( this ), "instance", producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
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}
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// Construct the geometry item if needed, otherwise refresh it
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if ( alpha == NULL )
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{
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alpha = mlt_geometry_init( );
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mlt_properties_set_data( MLT_FILTER_PROPERTIES( this ), "_alpha", alpha, 0, ( mlt_destructor )mlt_geometry_close, NULL );
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mlt_geometry_parse( alpha, alpha_data, length, 100, 100 );
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}
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else
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{
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mlt_geometry_refresh( alpha, alpha_data, length, 100, 100 );
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}
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// We may still not have a producer in which case, we do nothing
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if ( producer != NULL )
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{
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mlt_frame mask = NULL;
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struct mlt_geometry_item_s item;
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mlt_geometry_fetch( alpha, &item, position );
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alpha_mix = item.x;
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mlt_properties_pass( MLT_PRODUCER_PROPERTIES( producer ), MLT_FILTER_PROPERTIES( this ), "producer." );
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mlt_producer_seek( producer, position );
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if ( mlt_service_get_frame( MLT_PRODUCER_SERVICE( producer ), &mask, 0 ) == 0 )
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{
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char *name = mlt_properties_get( MLT_FILTER_PROPERTIES( this ), "_unique_id" );
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mlt_properties_set_data( MLT_FRAME_PROPERTIES( frame ), name, mask, 0, ( mlt_destructor )mlt_frame_close, NULL );
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mlt_frame_push_service( frame, this );
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mlt_frame_push_service( frame, mask );
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mlt_deque_push_back_double( MLT_FRAME_IMAGE_STACK( frame ), alpha_mix / 100.0 );
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mlt_frame_push_get_image( frame, filter_get_image );
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if ( mlt_properties_get_int( MLT_FILTER_PROPERTIES( this ), "audio_match" ) )
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{
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mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "meta.mixdown", 1 );
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mlt_properties_set_double( MLT_FRAME_PROPERTIES( frame ), "meta.volume", alpha_mix / 100.0 );
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}
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}
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}
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return frame;
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}
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/** Constructor for the filter.
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*/
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mlt_filter filter_shape_init( char *arg )
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{
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mlt_filter this = mlt_filter_new( );
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if ( this != NULL )
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{
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mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "resource", arg );
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mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "mix", "100" );
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mlt_properties_set_int( MLT_FILTER_PROPERTIES( this ), "audio_match", 1 );
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mlt_properties_set_int( MLT_FILTER_PROPERTIES( this ), "invert", 0 );
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mlt_properties_set_double( MLT_FILTER_PROPERTIES( this ), "softness", 0.1 );
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this->process = filter_process;
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}
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return this;
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}
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