git.sesse.net Git - mlt/blob - src/modules/plus/filter_affine.c

   1 /*
   2  * filter_affine.c -- affine 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.h>
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <math.h>
  27
  28 /** Do it :-).
  29 */
  30
  31 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  32 {
  33         // Get the filter
  34         mlt_filter filter = mlt_frame_pop_service( this );
  35
  36         // Get the properties
  37         mlt_properties properties = MLT_FILTER_PROPERTIES( filter );
  38
  39         // Get the image
  40         int error = 0;
  41         *format = mlt_image_rgb24a;
  42         //mlt_frame_get_image( this, image, format, width, height, 0 );
  43
  44         // Only process if we have no error and a valid colour space
  45         if ( error == 0 )
  46         {
  47                 mlt_service_lock( MLT_FILTER_SERVICE( filter ) );
  48                 mlt_producer producer = mlt_properties_get_data( properties, "producer", NULL );
  49                 mlt_transition transition = mlt_properties_get_data( properties, "transition", NULL );
  50                 mlt_frame a_frame = NULL;
  51                 mlt_profile profile = mlt_service_profile( MLT_FILTER_SERVICE( filter ) );
  52
  53                 if ( producer == NULL )
  54                 {
  55                         char *background = mlt_properties_get( properties, "background" );
  56                         producer = mlt_factory_producer( profile, NULL, background );
  57                         mlt_properties_set_data( properties, "producer", producer, 0, (mlt_destructor)mlt_producer_close, NULL );
  58                 }
  59
  60                 if ( transition == NULL )
  61                 {
  62                         transition = mlt_factory_transition( profile, "affine", NULL );
  63                         mlt_properties_set_data( properties, "transition", transition, 0, (mlt_destructor)mlt_transition_close, NULL );
  64                         if ( transition )
  65                                 mlt_properties_set_int( MLT_TRANSITION_PROPERTIES( transition ), "b_alpha", 1 );
  66                 }
  67
  68                 if ( producer != NULL && transition != NULL )
  69                 {
  70                         mlt_position position = mlt_filter_get_position( filter, this );
  71                         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( this );
  72                         mlt_position in = mlt_filter_get_in( filter );
  73                         mlt_position out = mlt_filter_get_out( filter );
  74                         double consumer_ar = mlt_profile_sar( profile );
  75                         mlt_transition_set_in_and_out( transition, in, out );
  76                         if ( out > 0 ) {
  77                                 mlt_properties_set_position( MLT_PRODUCER_PROPERTIES( producer ), "length", out - in + 1 );
  78                                 mlt_producer_set_in_and_out( producer, in, out );
  79                         }
  80                         mlt_producer_seek( producer, in + position );
  81                         mlt_frame_set_position( this, position );
  82                         mlt_properties_pass( MLT_PRODUCER_PROPERTIES( producer ), properties, "producer." );
  83                         mlt_properties_pass( MLT_TRANSITION_PROPERTIES( transition ), properties, "transition." );
  84                         mlt_service_get_frame( MLT_PRODUCER_SERVICE( producer ), &a_frame, 0 );
  85                         mlt_frame_set_position( a_frame, in + position );
  86 //                      mlt_properties_set_int( MLT_FRAME_PROPERTIES( a_frame ), "distort", 1 );
  87
  88                         // Special case - aspect_ratio = 0
  89                         if ( mlt_frame_get_aspect_ratio( this ) == 0 )
  90                                 mlt_frame_set_aspect_ratio( this, consumer_ar );
  91                         if ( mlt_frame_get_aspect_ratio( a_frame ) == 0 )
  92                                 mlt_frame_set_aspect_ratio( a_frame, consumer_ar );
  93
  94                         // Add the affine transition onto the frame stack
  95                         mlt_service_unlock( MLT_FILTER_SERVICE( filter ) );
  96                         mlt_transition_process( transition, a_frame, this );
  97
  98                         if ( mlt_properties_get_int( properties, "use_normalised" ) )
  99                         {
 100                                 // Use the normalised width & height
 101                                 mlt_profile profile = mlt_service_profile( MLT_FILTER_SERVICE( filter ) );
 102                                 *width = profile->width;
 103                                 *height = profile->height;
 104                         }
 105
 106                         mlt_frame_get_image( a_frame, image, format, width, height, writable );
 107                         mlt_properties_set_data( frame_properties, "affine_frame", a_frame, 0, (mlt_destructor)mlt_frame_close, NULL );
 108                         mlt_frame_set_image( this, *image, *width * *height * 4, NULL );
 109                         mlt_frame_set_alpha( this, mlt_frame_get_alpha_mask( a_frame ), *width * *height, NULL );
 110                 }
 111                 else
 112                 {
 113                         mlt_service_unlock( MLT_FILTER_SERVICE( filter ) );
 114                 }
 115         }
 116
 117         return error;
 118 }
 119
 120 /** Filter processing.
 121 */
 122
 123 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 124 {
 125         // Push the frame filter
 126         mlt_frame_push_service( frame, this );
 127         mlt_frame_push_get_image( frame, filter_get_image );
 128
 129         return frame;
 130 }
 131
 132 /** Constructor for the filter.
 133 */
 134
 135 mlt_filter filter_affine_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
 136 {
 137         mlt_filter this = mlt_filter_new( );
 138         if ( this != NULL )
 139         {
 140                 this->process = filter_process;
 141                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "background", arg ? arg : "colour:0" );
 142         }
 143         return this;
 144 }
 145
 146