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

   1 /*
   2  * filter_resize.c -- resizing 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_resize.h"
  22
  23 #include <framework/mlt_frame.h>
  24
  25 #include <stdio.h>
  26 #include <string.h>
  27 #include <stdlib.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         int owidth = *width;
  35         int oheight = *height;
  36         mlt_frame_get_image( this, image, format, &owidth, &oheight, 0 );
  37         if ( *width == 0 )
  38                 *width = 720;
  39         if ( *height == 0 )
  40                 *height = 576;
  41         if ( !strcmp( mlt_properties_get( mlt_frame_properties( this ), "resize.scale" ), "affine" ) )
  42                 *image = mlt_frame_rescale_yuv422( this, *width, *height );
  43         else
  44                 *image = mlt_frame_resize_yuv422( this, *width, *height );
  45         return 0;
  46 }
  47
  48 /** Filter processing.
  49 */
  50
  51 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
  52 {
  53         mlt_frame_push_get_image( frame, filter_get_image );
  54         mlt_properties_set( mlt_frame_properties( frame ), "resize.scale", mlt_properties_get( mlt_filter_properties( this ), "scale" ) );
  55         return frame;
  56 }
  57
  58 /** Constructor for the filter.
  59 */
  60
  61 mlt_filter filter_resize_init( char *arg )
  62 {
  63         mlt_filter this = calloc( sizeof( struct mlt_filter_s ), 1 );
  64         if ( mlt_filter_init( this, this ) == 0 )
  65         {
  66                 this->process = filter_process;
  67                 if ( arg != NULL )
  68                         mlt_properties_set( mlt_filter_properties( this ), "scale", arg );
  69                 else
  70                         mlt_properties_set( mlt_filter_properties( this ), "scale", "off" );
  71         }
  72         return this;
  73 }
  74