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 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_affine.h"
  22
  23 #include <framework/mlt.h>
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <math.h>
  28
  29 /** Do it :-).
  30 */
  31
  32 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  33 {
  34         // Get the filter
  35         mlt_filter filter = mlt_frame_pop_service( this );
  36
  37         // Get the properties
  38         mlt_properties properties = mlt_filter_properties( filter );
  39
  40         // Get the image
  41         int error = mlt_frame_get_image( this, image, format, width, height, 0 );
  42
  43         // Only process if we have no error and a valid colour space
  44         if ( error == 0 && *format == mlt_image_yuv422 )
  45         {
  46                 mlt_producer producer = mlt_properties_get_data( properties, "producer", NULL );
  47                 mlt_transition transition = mlt_properties_get_data( properties, "transition", NULL );
  48                 mlt_frame a_frame = NULL;
  49
  50                 if ( producer == NULL )
  51                 {
  52                         char *background = mlt_properties_get( properties, "background" );
  53                         producer = mlt_factory_producer( "fezzik", background );
  54                         mlt_properties_set_data( properties, "producer", producer, 0, (mlt_destructor)mlt_producer_close, NULL );
  55                 }
  56
  57                 if ( transition == NULL )
  58                 {
  59                         transition = mlt_factory_transition( "affine", NULL );
  60                         mlt_properties_set_data( properties, "transition", transition, 0, (mlt_destructor)mlt_transition_close, NULL );
  61                 }
  62
  63                 if ( producer != NULL && transition != NULL )
  64                 {
  65                         char *name = mlt_properties_get( properties, "_unique_id" );
  66                         mlt_position position = mlt_properties_get_position( mlt_frame_properties( this ), name );
  67                         mlt_properties frame_properties = mlt_frame_properties( this );
  68                         mlt_producer_seek( producer, position );
  69                         mlt_frame_set_position( this, position );
  70                         mlt_properties_pass( mlt_producer_properties( producer ), properties, "producer." );
  71                         mlt_properties_pass( mlt_transition_properties( transition ), properties, "transition." );
  72                         mlt_service_get_frame( mlt_producer_service( producer ), &a_frame, 0 );
  73                         mlt_properties_set( mlt_frame_properties( a_frame ), "rescale.interp", "nearest" );
  74                         mlt_properties_set( mlt_frame_properties( a_frame ), "distort", "true" );
  75                         mlt_properties_set_double( mlt_frame_properties( a_frame ), "consumer_aspect_ratio",
  76                                                                            mlt_properties_get_double( frame_properties, "consumer_aspect_ratio" ) );
  77                         mlt_transition_process( transition, a_frame, this );
  78                         mlt_frame_get_image( a_frame, image, format, width, height, writable );
  79                         mlt_properties_set_data( frame_properties, "affine_frame", a_frame, 0, (mlt_destructor)mlt_frame_close, NULL );
  80                         mlt_properties_set_data( frame_properties, "image", *image, *width * *height * 2, NULL, NULL );
  81                 }
  82         }
  83
  84         return error;
  85 }
  86
  87 /** Filter processing.
  88 */
  89
  90 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
  91 {
  92         // Get the properties of the frame
  93         mlt_properties properties = mlt_frame_properties( frame );
  94
  95         // Get a unique name to store the frame position
  96         char *name = mlt_properties_get( mlt_filter_properties( this ), "_unique_id" );
  97
  98         // Assign the current position to the name
  99         mlt_properties_set_position( properties, name, mlt_frame_get_position( frame ) );
 100
 101         // Push the frame filter
 102         mlt_frame_push_service( frame, this );
 103         mlt_frame_push_get_image( frame, filter_get_image );
 104
 105         return frame;
 106 }
 107
 108 /** Constructor for the filter.
 109 */
 110
 111 mlt_filter filter_affine_init( char *arg )
 112 {
 113         mlt_filter this = mlt_filter_new( );
 114         if ( this != NULL )
 115         {
 116                 this->process = filter_process;
 117                 mlt_properties_set( mlt_filter_properties( this ), "background", "colour:black" );
 118                 mlt_properties_set( mlt_filter_properties( this ), "transition.rotate_x", "10" );
 119         }
 120         return this;
 121 }
 122
 123