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
  32 /** Do it :-).
  33 */
  34
  35 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  36 {
  37         if ( *width == 0 )
  38                 *width = 720;
  39         if ( *height == 0 )
  40                 *height = 576;
  41
  42         mlt_properties properties = mlt_frame_properties( this );
  43         int iwidth = *width;
  44         int iheight = *height;
  45         int owidth = *width;
  46         int oheight = *height;
  47         uint8_t *input = NULL;
  48         char *interps = mlt_properties_get( properties, "rescale.interp" );
  49         int interp = PIXOPS_INTERP_BILINEAR;
  50
  51         if ( strcmp( interps, "nearest" ) == 0 )
  52                 interp = PIXOPS_INTERP_NEAREST;
  53         else if ( strcmp( interps, "tiles" ) == 0 )
  54                 interp = PIXOPS_INTERP_TILES;
  55         else if ( strcmp( interps, "hyper" ) == 0 )
  56                 interp = PIXOPS_INTERP_HYPER;
  57
  58         // If real_width/height exist, we want that as minimum information
  59         if ( mlt_properties_get_int( properties, "real_width" ) )
  60         {
  61                 iwidth = mlt_properties_get_int( properties, "real_width" );
  62                 iheight = mlt_properties_get_int( properties, "real_height" );
  63         }
  64
  65         // Let the producer know what we are actually requested to obtain
  66         mlt_properties_set_int( properties, "rescale_width", *width );
  67         mlt_properties_set_int( properties, "rescale_height", *height );
  68
  69         // Get the image as requested
  70         mlt_frame_get_image( this, &input, format, &iwidth, &iheight, writable );
  71
  72         if ( input != NULL )
  73         {
  74                 // If width and height are correct, don't do anything
  75                 if ( *format == mlt_image_yuv422 && strcmp( interps, "none" ) && ( iwidth != owidth || iheight != oheight ) )
  76                 {
  77                         // Create the output image
  78                         uint8_t *output = mlt_pool_alloc( owidth * ( oheight + 1 ) * 2 );
  79
  80                         // Calculate strides
  81                         int istride = iwidth * 2;
  82                         int ostride = owidth * 2;
  83
  84                         yuv422_scale_simple( output, owidth, oheight, ostride, input, iwidth, iheight, istride, interp );
  85
  86                         // Now update the frame
  87                         mlt_properties_set_data( properties, "image", output, owidth * ( oheight + 1 ) * 2, ( mlt_destructor )mlt_pool_release, NULL );
  88                         mlt_properties_set_int( properties, "width", owidth );
  89                         mlt_properties_set_int( properties, "height", oheight );
  90
  91                         // Return the output
  92                         *image = output;
  93                 }
  94                 else if ( *format == mlt_image_rgb24 || *format == mlt_image_rgb24a )
  95                 {
  96                         int bpp = (*format == mlt_image_rgb24a ? 4 : 3 );
  97
  98                         // Create the yuv image
  99                         uint8_t *output = mlt_pool_alloc( owidth * ( oheight + 1 ) * 2 );
 100
 101                         if ( strcmp( interps, "none" ) && ( iwidth != owidth || iheight != oheight ) )
 102                         {
 103                                 GdkPixbuf *pixbuf = gdk_pixbuf_new_from_data( input, GDK_COLORSPACE_RGB,
 104                                         ( *format == mlt_image_rgb24a ), 8, iwidth, iheight,
 105                                         iwidth * bpp, NULL, NULL );
 106
 107                                 GdkPixbuf *scaled = gdk_pixbuf_scale_simple( pixbuf, owidth, oheight, interp );
 108                                 g_object_unref( pixbuf );
 109
 110                                 // Extract YUV422 and alpha
 111                                 if ( bpp == 4 )
 112                                 {
 113                                         // Allocate the alpha mask
 114                                         uint8_t *alpha = mlt_pool_alloc( owidth * ( oheight + 1 ) );
 115
 116                                         // Convert the image and extract alpha
 117                                         mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( scaled ),
 118                                                                                   owidth, oheight,
 119                                                                                   gdk_pixbuf_get_rowstride( scaled ),
 120                                                                                   output, alpha );
 121
 122                                         mlt_properties_set_data( properties, "alpha", alpha, owidth * ( oheight + 1 ), ( mlt_destructor )mlt_pool_release, NULL );
 123                                 }
 124                                 else
 125                                 {
 126                                         // No alpha to extract
 127                                         mlt_convert_rgb24_to_yuv422( gdk_pixbuf_get_pixels( scaled ),
 128                                                                                  owidth, oheight,
 129                                                                                  gdk_pixbuf_get_rowstride( scaled ),
 130                                                                                  output );
 131                                 }
 132                                 g_object_unref( scaled );
 133                         }
 134                         else
 135                         {
 136                                 // Extract YUV422 and alpha
 137                                 if ( bpp == 4 )
 138                                 {
 139                                         // Allocate the alpha mask
 140                                         uint8_t *alpha = mlt_pool_alloc( owidth * ( oheight + 1 ) );
 141
 142                                         // Convert the image and extract alpha
 143                                         mlt_convert_rgb24a_to_yuv422( input,
 144                                                                                   owidth, oheight,
 145                                                                                   owidth * 4,
 146                                                                                   output, alpha );
 147
 148                                         mlt_properties_set_data( properties, "alpha", alpha, owidth * ( oheight + 1 ), ( mlt_destructor )mlt_pool_release, NULL );
 149                                 }
 150                                 else
 151                                 {
 152                                         // No alpha to extract
 153                                         mlt_convert_rgb24_to_yuv422( input,
 154                                                                                  owidth, oheight,
 155                                                                                  owidth * 3,
 156                                                                                  output );
 157                                 }
 158                         }
 159
 160                         // Now update the frame
 161                         mlt_properties_set_data( properties, "image", output, owidth * ( oheight + 1 ) * 2, ( mlt_destructor )mlt_pool_release, NULL );
 162                         mlt_properties_set_int( properties, "width", owidth );
 163                         mlt_properties_set_int( properties, "height", oheight );
 164
 165                         // Return the output
 166                         *format = mlt_image_yuv422;
 167                         *width = owidth;
 168                         *height = oheight;
 169                         *image = output;
 170                 }
 171                 else
 172                         *image = input;
 173         }
 174         else
 175                 *image = input;
 176
 177         return 0;
 178 }
 179
 180 static uint8_t *producer_get_alpha_mask( mlt_frame this )
 181 {
 182         // Obtain properties of frame
 183         mlt_properties properties = mlt_frame_properties( this );
 184
 185         // Return the alpha mask
 186         return mlt_properties_get_data( properties, "alpha", NULL );
 187 }
 188
 189 /** Filter processing.
 190 */
 191
 192 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 193 {
 194         mlt_frame_push_get_image( frame, filter_get_image );
 195         mlt_properties_set( mlt_frame_properties( frame ), "rescale.interp",
 196                 mlt_properties_get( mlt_filter_properties( this ), "interpolation" ) );
 197
 198         // Set alpha call back
 199         frame->get_alpha_mask = producer_get_alpha_mask;
 200         return frame;
 201 }
 202
 203 /** Constructor for the filter.
 204 */
 205
 206 mlt_filter filter_rescale_init( char *arg )
 207 {
 208         mlt_filter this = calloc( sizeof( struct mlt_filter_s ), 1 );
 209         if ( mlt_filter_init( this, this ) == 0 )
 210         {
 211                 this->process = filter_process;
 212                 if ( arg != NULL )
 213                         mlt_properties_set( mlt_filter_properties( this ), "interpolation", arg );
 214                 else
 215                         mlt_properties_set( mlt_filter_properties( this ), "interpolation", "bilinear" );
 216         }
 217         return this;
 218 }
 219