research.m1stereo.tv/gitweb/ - melted/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         // Determine maximum size within the aspect ratio:
  60         double aspect_ratio = mlt_frame_get_aspect_ratio( this );
  61         float display_aspect_ratio = 4.0 / 3.0; // (float)iwidth / (float)iheight;
  62         if ( *width < *height * aspect_ratio )
  63                 oheight = *width / aspect_ratio;
  64         else
  65                 owidth = *height * aspect_ratio;
  66         if ( ( float )owidth * display_aspect_ratio < *width )
  67                 owidth = ( int )( ( float )owidth * display_aspect_ratio );
  68         else if ( ( float )oheight * display_aspect_ratio < *height )
  69                 oheight = ( int )( ( float )oheight * display_aspect_ratio );
  70
  71         // If width and height are correct, don't do anything
  72         if ( input != NULL && ( iwidth != owidth || iheight != oheight ) )
  73         {
  74                 if ( *format == mlt_image_yuv422 )
  75                 {
  76                         // Create the output image
  77                         uint8_t *output = malloc( owidth * oheight * 2 );
  78
  79                         // Calculate strides
  80                         int istride = iwidth * 2;
  81                         int ostride = owidth * 2;
  82
  83                         yuv422_scale_simple( output, owidth, oheight, ostride, input, iwidth, iheight, istride, interp );
  84
  85                         // Now update the frame
  86                         mlt_properties_set_data( properties, "image", output, owidth * oheight * 2, free, NULL );
  87                         mlt_properties_set_int( properties, "width", owidth );
  88                         mlt_properties_set_int( properties, "height", oheight );
  89
  90                         // Return the output
  91                         *image = output;
  92                 }
  93                 else if ( *format == mlt_image_rgb24 || *format == mlt_image_rgb24a )
  94                 {
  95                         int bpp = (*format == mlt_image_rgb24a ? 4 : 3 );
  96                         GdkPixbuf *pixbuf = gdk_pixbuf_new_from_data( input, GDK_COLORSPACE_RGB,
  97                                 (*format == mlt_image_rgb24a), 24, iwidth, iheight,
  98                                 iwidth * bpp, NULL, NULL );
  99                         GdkPixbuf *scaled = gdk_pixbuf_scale_simple( pixbuf, owidth, oheight, interp );
 100
 101                         // Create the output image
 102                         uint8_t *output = malloc( owidth * oheight * bpp );
 103
 104                         int i;
 105                         for ( i = 0; i < oheight; i++ )
 106                                 memcpy( output + i * owidth * bpp,
 107                                                 gdk_pixbuf_get_pixels( scaled ) + i * gdk_pixbuf_get_rowstride( scaled ),
 108                                                 gdk_pixbuf_get_width( scaled ) * bpp );
 109
 110                         g_object_unref( pixbuf );
 111                         g_object_unref( scaled );
 112
 113                         // Now update the frame
 114                         mlt_properties_set_data( properties, "image", output, owidth * oheight * bpp, free, NULL );
 115                         mlt_properties_set_int( properties, "width", owidth );
 116                         mlt_properties_set_int( properties, "height", oheight );
 117
 118                         // Return the output
 119                         *image = output;
 120                 }
 121         }
 122         else
 123                 *image = input;
 124
 125         return 0;
 126 }
 127
 128 /** Filter processing.
 129 */
 130
 131 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 132 {
 133         mlt_frame_push_get_image( frame, filter_get_image );
 134         mlt_properties_set( mlt_frame_properties( frame ), "rescale.interp",
 135                 mlt_properties_get( mlt_filter_properties( this ), "interpolation" ) );
 136         return frame;
 137 }
 138
 139 /** Constructor for the filter.
 140 */
 141
 142 mlt_filter filter_rescale_init( char *arg )
 143 {
 144         mlt_filter this = calloc( sizeof( struct mlt_filter_s ), 1 );
 145         if ( mlt_filter_init( this, this ) == 0 )
 146         {
 147                 this->process = filter_process;
 148                 if ( arg != NULL )
 149                         mlt_properties_set( mlt_filter_properties( this ), "interpolation", arg );
 150                 else
 151                         mlt_properties_set( mlt_filter_properties( this ), "interpolation", "bilinear" );
 152         }
 153         return this;
 154 }
 155