git.sesse.net Git - mlt/blob - src/modules/gtk2/filter_rescale.c

   1 /*
   2  * filter_rescale.c -- scale the producer video frame size to match the consumer
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Dan Dennedy <dan@dennedy.org>
   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_rescale.h"
  22 #include "pixops.h"
  23
  24 #include <framework/mlt_frame.h>
  25
  26 #include <stdio.h>
  27 #include <string.h>
  28 #include <stdlib.h>
  29 #include <gdk-pixbuf/gdk-pixbuf.h>
  30
  31 /** Do it :-).
  32 */
  33
  34 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  35 {
  36         if ( *width == 0 )
  37                 *width = 720;
  38         if ( *height == 0 )
  39                 *height = 576;
  40
  41         mlt_properties properties = mlt_frame_properties( this );
  42         int iwidth = *width;
  43         int iheight = *height;
  44         int owidth = *width;
  45         int oheight = *height;
  46         uint8_t *input = NULL;
  47
  48         char *interps = mlt_properties_get( properties, "rescale.interp" );
  49         int interp = PIXOPS_INTERP_BILINEAR;
  50         if ( strcmp( interps, "nearest" ) == 0 )
  51                 interp = PIXOPS_INTERP_NEAREST;
  52         else if ( strcmp( interps, "tiles" ) == 0 )
  53                 interp = PIXOPS_INTERP_TILES;
  54         else if ( strcmp( interps, "hyper" ) == 0 )
  55                 interp = PIXOPS_INTERP_HYPER;
  56
  57         mlt_frame_get_image( this, &input, format, &iwidth, &iheight, 0 );
  58
  59         // If width and height are correct, don't do anything
  60         if ( iwidth != owidth || iheight != oheight )
  61         {
  62                 if ( *format == mlt_image_yuv422 )
  63                 {
  64                         // Create the output image
  65                         uint8_t *output = malloc( owidth * oheight * 2 );
  66
  67                         // Calculate strides
  68                         int istride = iwidth * 2;
  69                         int ostride = owidth * 2;
  70
  71                         yuv422_scale_simple( output, owidth, oheight, ostride, input, iwidth, iheight, istride, interp );
  72
  73                         // Now update the frame
  74                         mlt_properties_set_data( properties, "image", output, owidth * oheight * 2, free, NULL );
  75                         mlt_properties_set_int( properties, "width", owidth );
  76                         mlt_properties_set_int( properties, "height", oheight );
  77
  78                         // Return the output
  79                         *image = output;
  80                 }
  81                 else if ( *format == mlt_image_rgb24 || *format == mlt_image_rgb24a )
  82                 {
  83                         int bpp = (*format == mlt_image_rgb24a ? 4 : 3 );
  84                         GdkPixbuf *pixbuf = gdk_pixbuf_new_from_data( input, GDK_COLORSPACE_RGB,
  85                                 (*format == mlt_image_rgb24a), 24, iwidth, iheight,
  86                                 iwidth * bpp, NULL, NULL );
  87                         GdkPixbuf *scaled = gdk_pixbuf_scale_simple( pixbuf, owidth, oheight, interp );
  88
  89                         // Create the output image
  90                         uint8_t *output = malloc( owidth * oheight * bpp );
  91
  92                         int i;
  93                         for ( i = 0; i < oheight; i++ )
  94                                 memcpy( output + i * owidth * bpp,
  95                                                 gdk_pixbuf_get_pixels( scaled ) + i * gdk_pixbuf_get_rowstride( scaled ),
  96                                                 gdk_pixbuf_get_width( scaled ) * bpp );
  97
  98                         g_object_unref( pixbuf );
  99                         g_object_unref( scaled );
 100
 101                         // Now update the frame
 102                         mlt_properties_set_data( properties, "image", output, owidth * oheight * bpp, free, NULL );
 103                         mlt_properties_set_int( properties, "width", owidth );
 104                         mlt_properties_set_int( properties, "height", oheight );
 105
 106                         // Return the output
 107                         *image = output;
 108                 }
 109         }
 110         else
 111                 *image = input;
 112
 113         return 0;
 114 }
 115
 116 /** Filter processing.
 117 */
 118
 119 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 120 {
 121         mlt_frame_push_get_image( frame, filter_get_image );
 122         mlt_properties_set( mlt_frame_properties( frame ), "rescale.interp",
 123                 mlt_properties_get( mlt_filter_properties( this ), "interpolation" ) );
 124         return frame;
 125 }
 126
 127 /** Constructor for the filter.
 128 */
 129
 130 mlt_filter filter_rescale_init( char *arg )
 131 {
 132         mlt_filter this = calloc( sizeof( struct mlt_filter_s ), 1 );
 133         if ( mlt_filter_init( this, this ) == 0 )
 134         {
 135                 this->process = filter_process;
 136                 if ( arg != NULL )
 137                         mlt_properties_set( mlt_filter_properties( this ), "interpolation", arg );
 138                 else
 139                         mlt_properties_set( mlt_filter_properties( this ), "interpolation", "bilinear" );
 140         }
 141         return this;
 142 }
 143