research.m1stereo.tv/gitweb/ - melted/blob - src/modules/core/filter_luma.c

   1 /*
   2  * filter_luma.c -- luma filter
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library 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 GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <framework/mlt_filter.h>
  22 #include <framework/mlt_factory.h>
  23 #include <framework/mlt_frame.h>
  24 #include <framework/mlt_producer.h>
  25 #include <framework/mlt_transition.h>
  26
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30
  31 /** Do it :-).
  32 */
  33
  34 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  35 {
  36         int error = 0;
  37         mlt_filter filter = mlt_frame_pop_service( this );
  38         mlt_properties properties = MLT_FILTER_PROPERTIES( filter );
  39         mlt_transition luma = mlt_properties_get_data( properties, "luma", NULL );
  40         mlt_frame b_frame = mlt_properties_get_data( properties, "frame", NULL );
  41         mlt_properties b_frame_props = b_frame ? MLT_FRAME_PROPERTIES( b_frame ) : NULL;
  42         int out = mlt_properties_get_int( properties, "period" );
  43
  44         if ( out == 0 )
  45                 out = 24;
  46
  47         if ( b_frame == NULL || mlt_properties_get_int( b_frame_props, "width" ) != *width || mlt_properties_get_int( b_frame_props, "height" ) != *height )
  48         {
  49                 b_frame = mlt_frame_init( MLT_FILTER_SERVICE( filter ) );
  50                 mlt_properties_set_data( properties, "frame", b_frame, 0, ( mlt_destructor )mlt_frame_close, NULL );
  51         }
  52
  53         if ( luma == NULL )
  54         {
  55                 char *resource = mlt_properties_get( properties, "resource" );
  56                 mlt_profile profile = mlt_service_profile( MLT_FILTER_SERVICE( filter ) );
  57                 luma = mlt_factory_transition( profile, "luma", resource );
  58                 if ( luma != NULL )
  59                 {
  60                         mlt_properties luma_properties = MLT_TRANSITION_PROPERTIES( luma );
  61                         mlt_properties_set_int( luma_properties, "in", 0 );
  62                         mlt_properties_set_int( luma_properties, "out", out );
  63                         mlt_properties_set_int( luma_properties, "reverse", 1 );
  64                         mlt_properties_set_data( properties, "luma", luma, 0, ( mlt_destructor )mlt_transition_close, NULL );
  65                 }
  66
  67                 // Prime the filter with the first image to prevent a transition from the white
  68                 // of a test card.
  69                 error = mlt_frame_get_image( this, image, format, width, height, 1 );
  70                 if ( error == 0 )
  71                 {
  72                         mlt_properties a_props = MLT_FRAME_PROPERTIES( this );
  73                         int size = 0;
  74                         uint8_t *src = mlt_properties_get_data( a_props, "image", &size );
  75                         uint8_t *dst = mlt_pool_alloc( size );
  76
  77                         if ( dst != NULL )
  78                         {
  79                                 mlt_properties b_props = MLT_FRAME_PROPERTIES( b_frame );
  80                                 memcpy( dst, src, size );
  81                                 mlt_properties_set_data( b_props, "image", dst, size, mlt_pool_release, NULL );
  82                                 mlt_properties_set_int( b_props, "width", *width );
  83                                 mlt_properties_set_int( b_props, "height", *height );
  84                                 mlt_properties_set_int( b_props, "format", *format );
  85                         }
  86                 }
  87         }
  88
  89         if ( luma != NULL &&
  90                 ( mlt_properties_get( properties, "blur" ) != NULL ||
  91                   (int)mlt_frame_get_position( this ) % ( out + 1 ) != out ) )
  92         {
  93                 mlt_properties luma_properties = MLT_TRANSITION_PROPERTIES( luma );
  94                 mlt_properties_pass( luma_properties, properties, "luma." );
  95                 mlt_transition_process( luma, this, b_frame );
  96         }
  97
  98         error = mlt_frame_get_image( this, image, format, width, height, 1 );
  99
 100         if ( error == 0 )
 101         {
 102                 mlt_properties a_props = MLT_FRAME_PROPERTIES( this );
 103                 int size = 0;
 104                 uint8_t *src = mlt_properties_get_data( a_props, "image", &size );
 105                 uint8_t *dst = mlt_pool_alloc( size );
 106
 107                 if ( dst != NULL )
 108                 {
 109                         mlt_properties b_props = MLT_FRAME_PROPERTIES( b_frame );
 110                         memcpy( dst, src, size );
 111                         mlt_properties_set_data( b_props, "image", dst, size, mlt_pool_release, NULL );
 112                         mlt_properties_set_int( b_props, "width", *width );
 113                         mlt_properties_set_int( b_props, "height", *height );
 114                         mlt_properties_set_int( b_props, "format", *format );
 115                 }
 116         }
 117
 118         return error;
 119 }
 120
 121 /** Filter processing.
 122 */
 123
 124 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 125 {
 126         // Push the filter on to the stack
 127         mlt_frame_push_service( frame, this );
 128
 129         // Push the get_image on to the stack
 130         mlt_frame_push_get_image( frame, filter_get_image );
 131
 132         return frame;
 133 }
 134
 135 /** Constructor for the filter.
 136 */
 137
 138 mlt_filter filter_luma_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
 139 {
 140         mlt_filter this = mlt_filter_new( );
 141         if ( this != NULL )
 142         {
 143                 mlt_properties properties = MLT_FILTER_PROPERTIES( this );
 144                 this->process = filter_process;
 145                 if ( arg != NULL )
 146                         mlt_properties_set( properties, "resource", arg );
 147         }
 148         return this;
 149 }