research.m1stereo.tv/gitweb/ - melted/blob - src/modules/vmfx/filter_shape.c

   1 /*
   2  * filter_shape.c -- Arbitrary alpha channel shaping
   3  * Copyright (C) 2005 Visual Media Fx Inc.
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include "filter_shape.h"
  22 #include <string.h>
  23 #include <framework/mlt_factory.h>
  24 #include <framework/mlt_frame.h>
  25 #include <framework/mlt_producer.h>
  26 #include <framework/mlt_geometry.h>
  27
  28 inline double smoothstep( const double e1, const double e2, const double a )
  29 {
  30     if ( a < e1 ) return 0.0;
  31     if ( a > e2 ) return 1.0;
  32     double v = ( a - e1 ) / ( e2 - e1 );
  33     return ( v * v * ( 3 - 2 * v ) );
  34 }
  35
  36 /** Get the images and apply the luminance of the mask to the alpha of the frame.
  37 */
  38
  39 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  40 {
  41         // Fetch the data from the stack (mix, mask, filter)
  42         double mix = mlt_deque_pop_back_double( MLT_FRAME_IMAGE_STACK( this ) );
  43         mlt_frame mask = mlt_frame_pop_service( this );
  44         mlt_filter filter = mlt_frame_pop_service( this );
  45
  46         // Obtain the constants
  47         double softness = mlt_properties_get_double( MLT_FILTER_PROPERTIES( filter ), "softness" );
  48         int use_luminance = mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "use_luminance" );
  49         int invert = mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "invert" ) * 255;
  50
  51         // Render the frame
  52         if ( mlt_frame_get_image( this, image, format, width, height, writable ) == 0 )
  53         {
  54                 // Get the alpha mask of the source
  55                 uint8_t *alpha = mlt_frame_get_alpha_mask( this );
  56
  57                 // Obtain a scaled/distorted mask to match
  58                 uint8_t *mask_img = NULL;
  59                 mlt_image_format mask_fmt = mlt_image_yuv422;
  60                 mlt_properties_set_int( MLT_FRAME_PROPERTIES( mask ), "distort", 1 );
  61                 mlt_properties_pass_list( MLT_FRAME_PROPERTIES( mask ), MLT_FRAME_PROPERTIES( this ), "deinterlace,deinterlace_method,rescale.interp" );
  62
  63                 if ( mlt_frame_get_image( mask, &mask_img, &mask_fmt, width, height, 0 ) == 0 )
  64                 {
  65                         int size = *width * *height;
  66                         uint8_t *p = alpha;
  67                         double a = 0;
  68                         double b = 0;
  69                         if ( !use_luminance )
  70                         {
  71                                 uint8_t *q = mlt_frame_get_alpha_mask( mask );
  72                                 while( size -- )
  73                                 {
  74                                         a = ( double )*q ++ / 255.0;
  75                         b = 1.0 - smoothstep( a, a + softness, mix );
  76                                         *p = ( uint8_t )( *p * b ) ^ invert;
  77                                         p ++;
  78                                 }
  79                         }
  80                         else if ( mix != 1.0 )
  81                         {
  82                                 uint8_t *q = mask_img;
  83                                 while( size -- )
  84                                 {
  85                                         a = ( ( double )*q - 16 ) / 235.0;
  86                         b = smoothstep( a, a + softness, mix );
  87                                         *p = ( uint8_t )( *p * b ) ^ invert;
  88                                         p ++;
  89                                         q += 2;
  90                                 }
  91                         }
  92                 }
  93         }
  94
  95         return 0;
  96 }
  97
  98 /** Filter processing.
  99 */
 100
 101 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 102 {
 103         // Obtain the shape instance
 104         char *resource = mlt_properties_get( MLT_FILTER_PROPERTIES( this ), "resource" );
 105         mlt_producer producer = mlt_properties_get_data( MLT_FILTER_PROPERTIES( this ), "instance", NULL );
 106
 107         // Get the key framed values
 108         mlt_geometry alpha = mlt_properties_get_data( MLT_FILTER_PROPERTIES( this ), "_alpha", NULL );
 109         char *alpha_data = mlt_properties_get( MLT_FILTER_PROPERTIES( this ), "mix" );
 110         double alpha_mix = 0.0;
 111
 112         // Calculate the position and length
 113         int position = mlt_frame_get_position( frame ) - mlt_filter_get_in( this );
 114         int in = mlt_filter_get_in( this );
 115         int out = mlt_filter_get_out( this );
 116         int length;
 117
 118         // Special case for attached filters - in/out come through on the frame
 119         if ( out == 0 )
 120         {
 121                 in = mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "in" );
 122                 out = mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "out" );
 123         }
 124
 125         // Duration of the shape
 126         length = out - in + 1;
 127
 128         // If we haven't created the instance or it's changed
 129         if ( producer == NULL || strcmp( resource, mlt_properties_get( MLT_PRODUCER_PROPERTIES( producer ), "resource" ) ) )
 130         {
 131                 producer = mlt_factory_producer( NULL, resource );
 132                 if ( producer != NULL )
 133                         mlt_properties_set( MLT_PRODUCER_PROPERTIES( producer ), "eof", "loop" );
 134                 mlt_properties_set_data( MLT_FILTER_PROPERTIES( this ), "instance", producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
 135         }
 136
 137         // Construct the geometry item if needed, otherwise refresh it
 138         if ( alpha == NULL )
 139         {
 140                 alpha = mlt_geometry_init( );
 141                 mlt_properties_set_data( MLT_FILTER_PROPERTIES( this ), "_alpha", alpha, 0, ( mlt_destructor )mlt_geometry_close, NULL );
 142                 mlt_geometry_parse( alpha, alpha_data, length, 100, 100 );
 143         }
 144         else
 145         {
 146                 mlt_geometry_refresh( alpha, alpha_data, length, 100, 100 );
 147         }
 148
 149         // We may still not have a producer in which case, we do nothing
 150         if ( producer != NULL )
 151         {
 152                 mlt_frame mask = NULL;
 153                 struct mlt_geometry_item_s item;
 154                 mlt_geometry_fetch( alpha, &item, position );
 155                 alpha_mix = item.x;
 156                 mlt_properties_pass( MLT_PRODUCER_PROPERTIES( producer ), MLT_FILTER_PROPERTIES( this ), "producer." );
 157                 mlt_producer_seek( producer, position );
 158                 if ( mlt_service_get_frame( MLT_PRODUCER_SERVICE( producer ), &mask, 0 ) == 0 )
 159                 {
 160                         char *name = mlt_properties_get( MLT_FILTER_PROPERTIES( this ), "_unique_id" );
 161                         mlt_properties_set_data( MLT_FRAME_PROPERTIES( frame ), name, mask, 0, ( mlt_destructor )mlt_frame_close, NULL );
 162                         mlt_frame_push_service( frame, this );
 163                         mlt_frame_push_service( frame, mask );
 164                         mlt_deque_push_back_double( MLT_FRAME_IMAGE_STACK( frame ), alpha_mix / 100.0 );
 165                         mlt_frame_push_get_image( frame, filter_get_image );
 166                         if ( mlt_properties_get_int( MLT_FILTER_PROPERTIES( this ), "audio_match" ) )
 167                                 mlt_properties_set_double( MLT_FRAME_PROPERTIES( frame ), "meta.volume", alpha_mix / 100.0 );
 168                 }
 169         }
 170
 171         return frame;
 172 }
 173
 174 /** Constructor for the filter.
 175 */
 176
 177 mlt_filter filter_shape_init( char *arg )
 178 {
 179         mlt_filter this = mlt_filter_new( );
 180         if ( this != NULL )
 181         {
 182                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "resource", arg );
 183                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "mix", "100" );
 184                 mlt_properties_set_int( MLT_FILTER_PROPERTIES( this ), "audio_match", 1 );
 185                 mlt_properties_set_int( MLT_FILTER_PROPERTIES( this ), "invert", 0 );
 186                 mlt_properties_set_double( MLT_FILTER_PROPERTIES( this ), "softness", 0.1 );
 187                 this->process = filter_process;
 188         }
 189         return this;
 190 }
 191