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_yuv422 && !strcmp( interps, "none" ) )
  95                 {
  96                         // Do nothing
  97                         *width = iwidth;
  98                         *height = iheight;
  99                         *image = input;
 100                 }
 101                 else if ( *format == mlt_image_rgb24 || *format == mlt_image_rgb24a )
 102                 {
 103                         int bpp = (*format == mlt_image_rgb24a ? 4 : 3 );
 104
 105                         // Create the yuv image
 106                         uint8_t *output = mlt_pool_alloc( owidth * ( oheight + 1 ) * 2 );
 107
 108                         if ( strcmp( interps, "none" ) && ( iwidth != owidth || iheight != oheight ) )
 109                         {
 110                                 GdkPixbuf *pixbuf = gdk_pixbuf_new_from_data( input, GDK_COLORSPACE_RGB,
 111                                         ( *format == mlt_image_rgb24a ), 8, iwidth, iheight,
 112                                         iwidth * bpp, NULL, NULL );
 113
 114                                 GdkPixbuf *scaled = gdk_pixbuf_scale_simple( pixbuf, owidth, oheight, interp );
 115                                 g_object_unref( pixbuf );
 116
 117                                 // Extract YUV422 and alpha
 118                                 if ( bpp == 4 )
 119                                 {
 120                                         // Allocate the alpha mask
 121                                         uint8_t *alpha = mlt_pool_alloc( owidth * ( oheight + 1 ) );
 122
 123                                         // Convert the image and extract alpha
 124                                         mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( scaled ),
 125                                                                                   owidth, oheight,
 126                                                                                   gdk_pixbuf_get_rowstride( scaled ),
 127                                                                                   output, alpha );
 128
 129                                         mlt_properties_set_data( properties, "alpha", alpha, owidth * ( oheight + 1 ), ( mlt_destructor )mlt_pool_release, NULL );
 130                                 }
 131                                 else
 132                                 {
 133                                         // No alpha to extract
 134                                         mlt_convert_rgb24_to_yuv422( gdk_pixbuf_get_pixels( scaled ),
 135                                                                                  owidth, oheight,
 136                                                                                  gdk_pixbuf_get_rowstride( scaled ),
 137                                                                                  output );
 138                                 }
 139                                 g_object_unref( scaled );
 140                         }
 141                         else
 142                         {
 143                                 // Extract YUV422 and alpha
 144                                 if ( bpp == 4 )
 145                                 {
 146                                         // Allocate the alpha mask
 147                                         uint8_t *alpha = mlt_pool_alloc( owidth * ( oheight + 1 ) );
 148
 149                                         // Convert the image and extract alpha
 150                                         mlt_convert_rgb24a_to_yuv422( input,
 151                                                                                   owidth, oheight,
 152                                                                                   owidth * 4,
 153                                                                                   output, alpha );
 154
 155                                         mlt_properties_set_data( properties, "alpha", alpha, owidth * ( oheight + 1 ), ( mlt_destructor )mlt_pool_release, NULL );
 156                                 }
 157                                 else
 158                                 {
 159                                         // No alpha to extract
 160                                         mlt_convert_rgb24_to_yuv422( input,
 161                                                                                  owidth, oheight,
 162                                                                                  owidth * 3,
 163                                                                                  output );
 164                                 }
 165                         }
 166
 167                         // Now update the frame
 168                         mlt_properties_set_data( properties, "image", output, owidth * ( oheight + 1 ) * 2, ( mlt_destructor )mlt_pool_release, NULL );
 169                         mlt_properties_set_int( properties, "width", owidth );
 170                         mlt_properties_set_int( properties, "height", oheight );
 171
 172                         // Return the output
 173                         *format = mlt_image_yuv422;
 174                         *width = owidth;
 175                         *height = oheight;
 176                         *image = output;
 177                 }
 178                 else
 179                         *image = input;
 180         }
 181         else
 182                 *image = input;
 183
 184         return 0;
 185 }
 186
 187 static uint8_t *producer_get_alpha_mask( mlt_frame this )
 188 {
 189         // Obtain properties of frame
 190         mlt_properties properties = mlt_frame_properties( this );
 191
 192         // Return the alpha mask
 193         return mlt_properties_get_data( properties, "alpha", NULL );
 194 }
 195
 196 /** Filter processing.
 197 */
 198
 199 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 200 {
 201         mlt_frame_push_get_image( frame, filter_get_image );
 202         mlt_properties_set( mlt_frame_properties( frame ), "rescale.interp",
 203                 mlt_properties_get( mlt_filter_properties( this ), "interpolation" ) );
 204
 205         // Set alpha call back
 206         frame->get_alpha_mask = producer_get_alpha_mask;
 207         return frame;
 208 }
 209
 210 /** Constructor for the filter.
 211 */
 212
 213 mlt_filter filter_rescale_init( char *arg )
 214 {
 215         mlt_filter this = mlt_filter_new( );
 216         if ( this != NULL )
 217         {
 218                 this->process = filter_process;
 219                 mlt_properties_set( mlt_filter_properties( this ), "interpolation", arg == NULL ? "bilinear" : arg );
 220         }
 221         return this;
 222 }