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 "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                         double consumer_ar = mlt_properties_get_double( frame_properties, "consumer_aspect_ratio" );
  69                         mlt_properties_set_position( MLT_TRANSITION_PROPERTIES( transition ), "in", mlt_filter_get_in( filter ) );
  70                         mlt_properties_set_position( MLT_TRANSITION_PROPERTIES( transition ), "out", mlt_filter_get_out( filter ) );
  71                         mlt_producer_seek( producer, position );
  72                         mlt_frame_set_position( this, position );
  73                         mlt_properties_pass( MLT_PRODUCER_PROPERTIES( producer ), properties, "producer." );
  74                         mlt_properties_pass( MLT_TRANSITION_PROPERTIES( transition ), properties, "transition." );
  75                         mlt_service_get_frame( MLT_PRODUCER_SERVICE( producer ), &a_frame, 0 );
  76                         mlt_properties_set( MLT_FRAME_PROPERTIES( a_frame ), "rescale.interp", "nearest" );
  77                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( a_frame ), "distort", 1 );
  78
  79                         // Special case - aspect_ratio = 0
  80                         if ( mlt_properties_get_double( frame_properties, "aspect_ratio" ) == 0 )
  81                                 mlt_properties_set_double( frame_properties, "aspect_ratio", consumer_ar );
  82                         if ( mlt_properties_get_double( MLT_FRAME_PROPERTIES( a_frame ), "aspect_ratio" ) == 0 )
  83                                 mlt_properties_set_double( MLT_FRAME_PROPERTIES( a_frame ), "aspect_ratio", consumer_ar );
  84                         mlt_properties_set_double( MLT_FRAME_PROPERTIES( a_frame ), "consumer_aspect_ratio", consumer_ar );
  85
  86                         mlt_transition_process( transition, a_frame, this );
  87                         mlt_frame_get_image( a_frame, image, format, width, height, writable );
  88                         mlt_properties_set_data( frame_properties, "affine_frame", a_frame, 0, (mlt_destructor)mlt_frame_close, NULL );
  89                         mlt_properties_set_data( frame_properties, "image", *image, *width * *height * 2, NULL, NULL );
  90                         mlt_properties_set_data( frame_properties, "alpha", mlt_frame_get_alpha_mask( a_frame ), *width * *height, NULL, NULL );
  91                 }
  92         }
  93
  94         return error;
  95 }
  96
  97 /** Filter processing.
  98 */
  99
 100 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 101 {
 102         // Get the properties of the frame
 103         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
 104
 105         // Get a unique name to store the frame position
 106         char *name = mlt_properties_get( MLT_FILTER_PROPERTIES( this ), "_unique_id" );
 107
 108         // Assign the current position to the name
 109         mlt_properties_set_position( properties, name, mlt_frame_get_position( frame ) - mlt_filter_get_in( this ) );
 110
 111         // Push the frame filter
 112         mlt_frame_push_service( frame, this );
 113         mlt_frame_push_get_image( frame, filter_get_image );
 114
 115         return frame;
 116 }
 117
 118 /** Constructor for the filter.
 119 */
 120
 121 mlt_filter filter_affine_init( char *arg )
 122 {
 123         mlt_filter this = mlt_filter_new( );
 124         if ( this != NULL )
 125         {
 126                 this->process = filter_process;
 127                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "background", "colour:black" );
 128                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "transition.rotate_x", "10" );
 129         }
 130         return this;
 131 }
 132
 133