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_yuv422;
  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_producer producer = mlt_properties_get_data( properties, "producer", NULL );
  48                 mlt_transition transition = mlt_properties_get_data( properties, "transition", NULL );
  49                 mlt_frame a_frame = NULL;
  50
  51                 if ( producer == NULL )
  52                 {
  53                         char *background = mlt_properties_get( properties, "background" );
  54                         mlt_profile profile = mlt_service_profile( MLT_FILTER_SERVICE( filter ) );
  55                         producer = mlt_factory_producer( profile, NULL, background );
  56                         mlt_properties_set_data( properties, "producer", producer, 0, (mlt_destructor)mlt_producer_close, NULL );
  57                 }
  58
  59                 if ( transition == NULL )
  60                 {
  61                         mlt_profile profile = mlt_service_profile( MLT_FILTER_SERVICE( filter ) );
  62                         transition = mlt_factory_transition( profile, "affine", NULL );
  63                         mlt_properties_set_data( properties, "transition", transition, 0, (mlt_destructor)mlt_transition_close, NULL );
  64                 }
  65
  66                 if ( producer != NULL && transition != NULL )
  67                 {
  68                         char *name = mlt_properties_get( properties, "_unique_id" );
  69                         mlt_position position = mlt_properties_get_position( MLT_FRAME_PROPERTIES( this ), name );
  70                         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( this );
  71                         double consumer_ar = mlt_properties_get_double( frame_properties, "consumer_aspect_ratio" );
  72                         mlt_properties_set_position( MLT_TRANSITION_PROPERTIES( transition ), "in", mlt_filter_get_in( filter ) );
  73                         mlt_properties_set_position( MLT_TRANSITION_PROPERTIES( transition ), "out", mlt_filter_get_out( filter ) );
  74                         mlt_producer_seek( producer, position );
  75                         mlt_frame_set_position( this, position );
  76                         mlt_properties_pass( MLT_PRODUCER_PROPERTIES( producer ), properties, "producer." );
  77                         mlt_properties_pass( MLT_TRANSITION_PROPERTIES( transition ), properties, "transition." );
  78                         mlt_service_get_frame( MLT_PRODUCER_SERVICE( producer ), &a_frame, 0 );
  79                         mlt_properties_set( MLT_FRAME_PROPERTIES( a_frame ), "rescale.interp", "nearest" );
  80                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( a_frame ), "distort", 1 );
  81
  82                         // Special case - aspect_ratio = 0
  83                         if ( mlt_properties_get_double( frame_properties, "aspect_ratio" ) == 0 )
  84                                 mlt_properties_set_double( frame_properties, "aspect_ratio", consumer_ar );
  85                         if ( mlt_properties_get_double( MLT_FRAME_PROPERTIES( a_frame ), "aspect_ratio" ) == 0 )
  86                                 mlt_properties_set_double( MLT_FRAME_PROPERTIES( a_frame ), "aspect_ratio", consumer_ar );
  87                         mlt_properties_set_double( MLT_FRAME_PROPERTIES( a_frame ), "consumer_aspect_ratio", consumer_ar );
  88
  89                         mlt_transition_process( transition, a_frame, this );
  90                         mlt_frame_get_image( a_frame, image, format, width, height, writable );
  91                         mlt_properties_set_data( frame_properties, "affine_frame", a_frame, 0, (mlt_destructor)mlt_frame_close, NULL );
  92                         mlt_properties_set_data( frame_properties, "image", *image, *width * *height * 2, NULL, NULL );
  93                         mlt_properties_set_data( frame_properties, "alpha", mlt_frame_get_alpha_mask( a_frame ), *width * *height, NULL, NULL );
  94                 }
  95         }
  96
  97         return error;
  98 }
  99
 100 /** Filter processing.
 101 */
 102
 103 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 104 {
 105         // Get the properties of the frame
 106         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
 107
 108         // Get a unique name to store the frame position
 109         char *name = mlt_properties_get( MLT_FILTER_PROPERTIES( this ), "_unique_id" );
 110
 111         // Assign the current position to the name
 112         mlt_properties_set_position( properties, name, mlt_frame_get_position( frame ) - mlt_filter_get_in( this ) );
 113
 114         // Push the frame filter
 115         mlt_frame_push_service( frame, this );
 116         mlt_frame_push_get_image( frame, filter_get_image );
 117
 118         return frame;
 119 }
 120
 121 /** Constructor for the filter.
 122 */
 123
 124 mlt_filter filter_affine_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
 125 {
 126         mlt_filter this = mlt_filter_new( );
 127         if ( this != NULL )
 128         {
 129                 this->process = filter_process;
 130                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "background", "colour:black" );
 131         }
 132         return this;
 133 }
 134
 135